CSY/reowolf Changeset - d7baa792c2c2 · Centrum Wiskunde & Informatica (CWI)

Changeset - d7baa792c2c2

Parent rev.

Child rev.

[Not reviewed]

0 12 0

MH - 4 years ago 2021-05-05 14:36:56
contact@maxhenger.nl

fix all parsing tests, onto rewriting the runtime

8 files changed:

src/protocol/input_source.rs

src/protocol/parser/pass_definitions.rs

src/protocol/parser/pass_imports.rs

src/protocol/parser/pass_tokenizer.rs

src/protocol/parser/pass_validation_linking.rs

src/protocol/parser/symbol_table.rs

src/protocol/parser/token_parsing.rs

src/protocol/tests/parser_imports.rs

Changeset was too big and was cut off... Show full diff anyway

0 comments (0 inline, 0 general)

src/protocol/input_source.rs

➞

Show inline comments

 use std::fmt;
 use std::sync::{RwLock, RwLockReadGuard};
 use std::fmt::Write;
 #[derive(Debug, Clone, Copy)]
 pub struct InputPosition {
     pub line: u32,
     pub offset: u32,
+}
 impl InputPosition {
     pub(crate) fn with_offset(&self, offset: u32) -> Self {
         InputPosition { line: self.line, offset: self.offset + offset }
+    }
+}
 #[derive(Debug, Clone, Copy)]
 pub struct InputSpan {
     pub begin: InputPosition,
     pub end: InputPosition,
+}
 impl InputSpan {
     #[inline]
     pub fn from_positions(begin: InputPosition, end: InputPosition) -> Self {
         Self { begin, end }
+    }
+}
 /// Wrapper around source file with optional filename. Ensures that the file is
 /// only scanned once.
 pub struct InputSource {
     pub(crate) filename: String,
     pub(crate) input: Vec<u8>,
     // Iteration
     line: u32,
     offset: usize,
     // State tracking
     pub(crate) had_error: Option<ParseError>,
     // The offset_lookup is built on-demand upon attempting to report an error.
     // Only one procedure will actually create the lookup, afterwards only read
     // locks will be held.
     offset_lookup: RwLock<Vec<u32>>,
+}
 impl InputSource {
     pub fn new(filename: String, input: Vec<u8>) -> Self {
         Self{
             filename,
             input,
             line: 1,
             offset: 0,
             had_error: None,
             offset_lookup: RwLock::new(Vec::new()),
+        }
+    }
     #[cfg(test)]
     pub fn new_test(input: &str) -> Self {
         let bytes = Vec::from(input.as_bytes());
         return Self::new(String::from("test"), bytes)
+    }
     #[inline]
     pub fn pos(&self) -> InputPosition {
         InputPosition { line: self.line, offset: self.offset as u32 }
+    }
     pub fn next(&self) -> Option<u8> {
         if self.offset < self.input.len() {
             Some(self.input[self.offset])
         } else {
             None
+        }
+    }
     pub fn lookahead(&self, offset: usize) -> Option<u8> {
         let offset_pos = self.offset + offset;
         if offset_pos < self.input.len() {
             Some(self.input[offset_pos])
         } else {
             None
+        }
+    }
     #[inline]
     pub fn section_at_pos(&self, start: InputPosition, end: InputPosition) -> &[u8] {
         &self.input[start.offset as usize..end.offset as usize]
+    }
     #[inline]
     pub fn section_at_span(&self, span: InputSpan) -> &[u8] {
         &self.input[span.begin.offset as usize..span.end.offset as usize]
+    }
     // Consumes the next character. Will check well-formedness of newlines: \r
     // must be followed by a \n, because this is used for error reporting. Will
     // not check for ascii-ness of the file, better left to a tokenizer.
     pub fn consume(&mut self) {
         match self.next() {
             Some(b'\r') => {
                 if Some(b'\n') == self.lookahead(1) {
                     // Well formed file
                     self.offset += 1;
                 } else {
                     // Not a well-formed file, pretend like we can continue
                     self.offset += 1;
                     self.set_error("Encountered carriage-feed without a following newline");
+                }
             },
             Some(b'\n') => {
                 self.line += 1;
                 self.offset += 1;
             },
             Some(_) => {
                 self.offset += 1;
+            }
             None => {}
+        }
         // Maybe we actually want to check this in release mode. Then again:
         // a 4 gigabyte source file... Really?
         debug_assert!(self.offset < u32::max_value() as usize);
+    }
     fn set_error(&mut self, msg: &str) {
         if self.had_error.is_none() {
             self.had_error = Some(ParseError::new_error_str_at_pos(self, self.pos(), msg));
+        }
+    }
     fn get_lookup(&self) -> RwLockReadGuard<Vec<u32>> {
         // Once constructed the lookup always contains one element. We use this
         // to see if it is constructed already.
+        {
             let lookup = self.offset_lookup.read().unwrap();
             if !lookup.is_empty() {
                 return lookup;
+            }
+        }
         // Lookup was not constructed yet
         let mut lookup = self.offset_lookup.write().unwrap();
         if !lookup.is_empty() {
             // Somebody created it before we had the chance
             drop(lookup);
             let lookup = self.offset_lookup.read().unwrap();
             return lookup;
+        }
         // Build the line number (!) to offset lookup, so offset by 1. We
         // assume the entire source file is scanned (most common case) for
         // preallocation.
         lookup.reserve(self.line as usize + 2);
         lookup.push(0); // line 0: never used
         lookup.push(0); // first line: first character
         for char_idx in 0..self.input.len() {
             if self.input[char_idx] == b'\n' {
                 lookup.push(char_idx as u32 + 1);
+            }
+        }
         lookup.push(self.input.len() as u32); // for lookup_line_end
+        lookup.push(self.input.len() as u32 + 1); // for lookup_line_end, intentionally adding one character
         debug_assert_eq!(self.line as usize + 2, lookup.len(), "remove me: i am a testing assert and sometimes invalid");
         // Return created lookup
         drop(lookup);
         let lookup = self.offset_lookup.read().unwrap();
         return lookup;
+    }
     /// Retrieves offset at which line starts (right after newline)
     fn lookup_line_start_offset(&self, line_number: u32) -> u32 {
         let lookup = self.get_lookup();
         lookup[line_number as usize]
+    }
     /// Retrieves offset at which line ends (at the newline character or the
     /// preceding carriage feed for \r\n-encoded newlines)
     fn lookup_line_end_offset(&self, line_number: u32) -> u32 {
         let lookup = self.get_lookup();
         let offset = lookup[(line_number + 1) as usize] - 1;
         let offset_usize = offset as usize;
         // Compensate for newlines and a potential carriage feed
         if self.input[offset_usize] == b'\n' {
             if offset_usize > 0 && self.input[offset_usize] == b'\r' {
                 offset - 2
             } else {
         // Compensate for newlines and a potential carriage feed. Note that the
         // end position is exclusive. So we only need to compensate for a
         // "\r\n"
         if offset_usize > 0 && offset_usize < self.input.len() && self.input[offset_usize] == b'\n' && self.input[offset_usize - 1] == b'\r' {
             offset - 1
+            }
         } else {
             offset
+        }
+    }
+}
 #[derive(Debug)]
 pub enum StatementKind {
     Info,
     Error
+}
 #[derive(Debug)]
 pub enum ContextKind {
     SingleLine,
     MultiLine,
+}
 #[derive(Debug)]
 pub struct ParseErrorStatement {
     pub(crate) statement_kind: StatementKind,
     pub(crate) context_kind: ContextKind,
     pub(crate) start_line: u32,
     pub(crate) start_column: u32,
     pub(crate) end_line: u32,
     pub(crate) end_column: u32,
     pub(crate) filename: String,
     pub(crate) context: String,
     pub(crate) message: String,
+}
 impl ParseErrorStatement {
     fn from_source_at_pos(statement_kind: StatementKind, source: &InputSource, position: InputPosition, message: String) -> Self {
         // Seek line start and end
         let line_start = source.lookup_line_start_offset(position.line);
         let line_end = source.lookup_line_end_offset(position.line);
         let context = Self::create_context(source, line_start as usize, line_end as usize);
         debug_assert!(position.offset >= line_start);
         let column = position.offset - line_start + 1;
         Self{
             statement_kind,
             context_kind: ContextKind::SingleLine,
             start_line: position.line,
             start_column: column,
             end_line: position.line,
             end_column: column + 1,
             filename: source.filename.clone(),
             context,
             message,
+        }
+    }
     fn from_source_at_span(statement_kind: StatementKind, source: &InputSource, span: InputSpan, message: String) -> Self {
         debug_assert!(span.end.line >= span.begin.line);
         debug_assert!(span.end.offset >= span.begin.offset);
         let first_line_start = source.lookup_line_start_offset(span.begin.line);
         let last_line_start = source.lookup_line_start_offset(span.end.line);
         let last_line_end = source.lookup_line_end_offset(span.end.line);
         let context = Self::create_context(source, first_line_start as usize, last_line_end as usize);
         debug_assert!(span.begin.offset >= first_line_start);
         let start_column = span.begin.offset - first_line_start + 1;
         let end_column = span.end.offset - last_line_start + 1;
         let context_kind = if span.begin.line == span.end.line {
             ContextKind::SingleLine
         } else {
             ContextKind::MultiLine
         };
         Self{
             statement_kind,
             context_kind,
             start_line: span.begin.line,
             start_column,
             end_line: span.end.line,
             end_column,
             filename: source.filename.clone(),
             context,
             message,
+        }
+    }
     /// Produces context from source
     fn create_context(source: &InputSource, start: usize, end: usize) -> String {
         let context_raw = &source.input[start..end];
         String::from_utf8_lossy(context_raw).to_string()
+    }
+}
 impl fmt::Display for ParseErrorStatement {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         // Write kind of statement and message
         match self.statement_kind {
             StatementKind::Info => f.write_str(" INFO: ")?,
             StatementKind::Error => f.write_str("ERROR: ")?,
+        }
         f.write_str(&self.message)?;
         f.write_char('\n')?;
         // Write originating file/line/column
         f.write_str(" +- ")?;
         if !self.filename.is_empty() {
             write!(f, "in {} ", self.filename)?;
+        }
         match self.context_kind {
             ContextKind::SingleLine => writeln!(f, " at {}:{}", self.start_line, self.start_column),
             ContextKind::MultiLine => writeln!(
                 f, " from {}:{} to {}:{}",
                 self.start_line, self.start_column, self.end_line, self.end_column
+            )
         }?;
         // Helper function for writing context: converting tabs into 4 spaces
         // (oh, the controversy!) and creating an annotated line
         fn transform_context(source: &str, target: &mut String) {
             for char in source.chars() {
                 if char == '\t' {
                     target.push_str("    ");
                 } else {
                     target.push(char);
+                }
+            }
+        }
         fn extend_annotation(first_col: u32, last_col: u32, source: &str, target: &mut String, extend_char: char) {
             debug_assert!(first_col > 0 && last_col > first_col);
             // If the first index exceeds the size of the context then we should
             // have a message placed at the newline character
             let first_idx = first_col as usize - 1;
             let last_idx = last_col as usize - 1;
             if first_idx >= source.len() {
                 // If any of these fail then the logic behind reporting errors
                 // is incorrect.
                 debug_assert_eq!(first_idx, source.len());
                 debug_assert_eq!(first_idx + 1, last_idx);
                 target.push(extend_char);
             } else {
                 for (char_idx, char) in source.chars().enumerate().skip(first_idx) {
                     if char_idx == last_idx as usize {
                         break;
+                    }
                     if char == '\t' {
                         for _ in 0..4 { target.push(extend_char); }
                     } else {
                         target.push(extend_char);
+                    }
+                }
+            }
+        }
         // Write source context
         writeln!(f, " | ")?;
         let mut context = String::with_capacity(128);
         let mut annotation = String::with_capacity(128);
         match self.context_kind {
             ContextKind::SingleLine => {
                 // Write single line of context with indicator for the offending
                 // span underneath.
                 context.push_str(" |  ");
                 transform_context(&self.context, &mut context);
                 context.push('\n');
                 f.write_str(&context)?;
                 annotation.push_str(" | ");
                 extend_annotation(1, self.start_column + 1, &self.context, &mut annotation, ' ');
                 extend_annotation(self.start_column, self.end_column, &self.context, &mut annotation, '~');
                 annotation.push('\n');
                 f.write_str(&annotation)?;
             },
             ContextKind::MultiLine => {
                 // Annotate all offending lines
                 // - first line
                 let mut lines = self.context.lines();
                 let first_line = lines.next().unwrap();
                 transform_context(first_line, &mut context);
                 writeln!(f, " |- {}", &context)?;
                 // - remaining lines
                 let mut last_line = first_line;
                 while let Some(cur_line) = lines.next() {
                     context.clear();
                     transform_context(cur_line, &mut context);
                     writeln!(f, " |  {}", &context)?;
                     last_line = cur_line;
+                }
                 // - underline beneath last line
                 annotation.push_str(" \\__");
                 extend_annotation(1, self.end_column, &last_line, &mut annotation, '_');
                 annotation.push_str("/\n");
                 f.write_str(&annotation)?;
+            }
+        }
         Ok(())
+    }
+}
 #[derive(Debug)]
 pub struct ParseError {
     pub(crate) statements: Vec<ParseErrorStatement>
+}
 impl fmt::Display for ParseError {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         if self.statements.is_empty() {
             return Ok(())
+        }
         self.statements[0].fmt(f)?;
         for statement in self.statements.iter().skip(1) {
             writeln!(f)?;
             statement.fmt(f)?;
+        }
         Ok(())
+    }
+}
 impl ParseError {
     pub fn new_error_at_pos(source: &InputSource, position: InputPosition, message: String) -> Self {
         Self{ statements: vec!(ParseErrorStatement::from_source_at_pos(
             StatementKind::Error, source, position, message
         )) }
+    }
     pub fn new_error_str_at_pos(source: &InputSource, position: InputPosition, message: &str) -> Self {
         Self{ statements: vec!(ParseErrorStatement::from_source_at_pos(
             StatementKind::Error, source, position, message.to_string()
         )) }
+    }
     pub fn new_error_at_span(source: &InputSource, span: InputSpan, message: String) -> Self {
         Self{ statements: vec!(ParseErrorStatement::from_source_at_span(
             StatementKind::Error, source, span, message
         )) }
+    }
     pub fn new_error_str_at_span(source: &InputSource, span: InputSpan, message: &str) -> Self {
         Self{ statements: vec!(ParseErrorStatement::from_source_at_span(
             StatementKind::Error, source, span, message.to_string()
         )) }
+    }
     pub fn with_at_pos(mut self, error_type: StatementKind, source: &InputSource, position: InputPosition, message: String) -> Self {
         self.statements.push(ParseErrorStatement::from_source_at_pos(error_type, source, position, message));
         self
+    }
     pub fn with_at_span(mut self, error_type: StatementKind, source: &InputSource, span: InputSpan, message: String) -> Self {
         self.statements.push(ParseErrorStatement::from_source_at_span(error_type, source, span, message.to_string()));
         self
+    }
     pub fn with_info_at_pos(self, source: &InputSource, position: InputPosition, msg: String) -> Self {
         self.with_at_pos(StatementKind::Info, source, position, msg)
+    }
     pub fn with_info_str_at_pos(self, source: &InputSource, position: InputPosition, msg: &str) -> Self {
         self.with_at_pos(StatementKind::Info, source, position, msg.to_string())
+    }
     pub fn with_info_at_span(self, source: &InputSource, span: InputSpan, msg: String) -> Self {
         self.with_at_span(StatementKind::Info, source, span, msg)
+    }
     pub fn with_info_str_at_span(self, source: &InputSource, span: InputSpan, msg: &str) -> Self {
         self.with_at_span(StatementKind::Info, source, span, msg.to_string())
+    }
+}

src/protocol/parser/pass_definitions.rs

➞

Show inline comments

 use crate::protocol::ast::*;
 use super::symbol_table::*;
 use super::{Module, ModuleCompilationPhase, PassCtx};
 use super::tokens::*;
 use super::token_parsing::*;
 use crate::protocol::input_source::{InputSource as InputSource, InputPosition as InputPosition, InputSpan, ParseError};
 use crate::collections::*;
 /// Parses all the tokenized definitions into actual AST nodes.
 pub(crate) struct PassDefinitions {
     // State
     cur_definition: DefinitionId,
     // Temporary buffers of various kinds
     buffer: String,
     struct_fields: ScopedBuffer<StructFieldDefinition>,
     enum_variants: ScopedBuffer<EnumVariantDefinition>,
     union_variants: ScopedBuffer<UnionVariantDefinition>,
     parameters: ScopedBuffer<ParameterId>,
     expressions: ScopedBuffer<ExpressionId>,
     statements: ScopedBuffer<StatementId>,
     parser_types: ScopedBuffer<ParserType>,
+}
 impl PassDefinitions {
     pub(crate) fn new() -> Self {
         Self{
             cur_definition: DefinitionId::new_invalid(),
             buffer: String::with_capacity(128),
             struct_fields: ScopedBuffer::new_reserved(128),
             enum_variants: ScopedBuffer::new_reserved(128),
             union_variants: ScopedBuffer::new_reserved(128),
             parameters: ScopedBuffer::new_reserved(128),
             expressions: ScopedBuffer::new_reserved(128),
             statements: ScopedBuffer::new_reserved(128),
             parser_types: ScopedBuffer::new_reserved(128),
+        }
+    }
     pub(crate) fn parse(&mut self, modules: &mut [Module], module_idx: usize, ctx: &mut PassCtx) -> Result<(), ParseError> {
         let module = &modules[module_idx];
         let module_range = &module.tokens.ranges[0];
         debug_assert_eq!(module.phase, ModuleCompilationPhase::ImportsResolved);
         debug_assert_eq!(module_range.range_kind, TokenRangeKind::Module);
         // Although we only need to parse the definitions, we want to go through
         // code ranges as well such that we can throw errors if we get
         // unexpected tokens at the module level of the source.
         let mut range_idx = module_range.first_child_idx;
         loop {
             let range_idx_usize = range_idx as usize;
             let cur_range = &module.tokens.ranges[range_idx_usize];
             match cur_range.range_kind {
                 TokenRangeKind::Module => unreachable!(), // should not be reachable
                 TokenRangeKind::Pragma | TokenRangeKind::Import => continue, // already fully parsed
                 TokenRangeKind::Definition | TokenRangeKind::Code => {}
+            }
                 TokenRangeKind::Pragma | TokenRangeKind::Import => {
                     // Already fully parsed, fall through and go to next range
                 },
                 TokenRangeKind::Definition | TokenRangeKind::Code => {
                     // Visit range even if it is a "code" range to provide
                     // proper error messages.
                     self.visit_range(modules, module_idx, ctx, range_idx_usize)?;
                 },
+            }
             if cur_range.next_sibling_idx == NO_SIBLING {
                 break;
             } else {
                 range_idx = cur_range.next_sibling_idx;
+            }
+        }
         modules[module_idx].phase = ModuleCompilationPhase::DefinitionsParsed;
         Ok(())
+    }
     fn visit_range(
         &mut self, modules: &[Module], module_idx: usize, ctx: &mut PassCtx, range_idx: usize
     ) -> Result<(), ParseError> {
         let module = &modules[module_idx];
         let cur_range = &module.tokens.ranges[range_idx];
         debug_assert!(cur_range.range_kind == TokenRangeKind::Definition || cur_range.range_kind == TokenRangeKind::Code);
         // Detect which definition we're parsing
         let mut iter = module.tokens.iter_range(cur_range);
         loop {
             let next = iter.next();
             if next.is_none() {
                 return Ok(())
+            }
             // Token was not None, so peek_ident returns None if not an ident
             let ident = peek_ident(&module.source, &mut iter);
             match ident {
                 Some(KW_STRUCT) => self.visit_struct_definition(module, &mut iter, ctx)?,
                 Some(KW_ENUM) => self.visit_enum_definition(module, &mut iter, ctx)?,
                 Some(KW_UNION) => self.visit_union_definition(module, &mut iter, ctx)?,
                 Some(KW_FUNCTION) => self.visit_function_definition(module, &mut iter, ctx)?,
                 Some(KW_PRIMITIVE) | Some(KW_COMPOSITE) => self.visit_component_definition(module, &mut iter, ctx)?,
                 _ => return Err(ParseError::new_error_str_at_pos(
                     &module.source, iter.last_valid_pos(),
                     "unexpected symbol, expected a keyword marking the start of a definition"
                 )),
+            }
+        }
+    }
     fn visit_struct_definition(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<(), ParseError> {
         consume_exact_ident(&module.source, iter, KW_STRUCT)?;
         let (ident_text, _) = consume_ident(&module.source, iter)?;
         // Retrieve preallocated DefinitionId
         let module_scope = SymbolScope::Module(module.root_id);
         let definition_id = ctx.symbols.get_symbol_by_name_defined_in_scope(module_scope, ident_text)
             .unwrap().variant.as_definition().definition_id;
         self.cur_definition = definition_id;
         // Parse struct definition
         consume_polymorphic_vars_spilled(&module.source, iter, ctx)?;
         let mut fields_section = self.struct_fields.start_section();
         consume_comma_separated(
             TokenKind::OpenCurly, TokenKind::CloseCurly, &module.source, iter, ctx,
             |source, iter, ctx| {
                 let poly_vars = ctx.heap[definition_id].poly_vars(); // TODO: @Cleanup, this is really ugly. But rust...
                 let start_pos = iter.last_valid_pos();
                 let parser_type = consume_parser_type(
                     source, iter, &ctx.symbols, &ctx.heap, poly_vars, module_scope,
                     definition_id, false, 0
                 )?;
                 let field = consume_ident_interned(source, iter, ctx)?;
                 Ok(StructFieldDefinition{
                     span: InputSpan::from_positions(start_pos, field.span.end),
                     field, parser_type
                 })
             },
             &mut fields_section, "a struct field", "a list of struct fields", None
         )?;
         // Transfer to preallocated definition
         let struct_def = ctx.heap[definition_id].as_struct_mut();
         struct_def.fields = fields_section.into_vec();
         Ok(())
+    }
     fn visit_enum_definition(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<(), ParseError> {
         consume_exact_ident(&module.source, iter, KW_ENUM)?;
         let (ident_text, _) = consume_ident(&module.source, iter)?;
         // Retrieve preallocated DefinitionId
         let module_scope = SymbolScope::Module(module.root_id);
         let definition_id = ctx.symbols.get_symbol_by_name_defined_in_scope(module_scope, ident_text)
             .unwrap().variant.as_definition().definition_id;
         self.cur_definition = definition_id;
         // Parse enum definition
         consume_polymorphic_vars_spilled(&module.source, iter, ctx)?;
         let mut enum_section = self.enum_variants.start_section();
         consume_comma_separated(
             TokenKind::OpenCurly, TokenKind::CloseCurly, &module.source, iter, ctx,
             |source, iter, ctx| {
                 let identifier = consume_ident_interned(source, iter, ctx)?;
                 let value = if iter.next() == Some(TokenKind::Equal) {
                     iter.consume();
                     let (variant_number, _) = consume_integer_literal(source, iter, &mut self.buffer)?;
                     EnumVariantValue::Integer(variant_number as i64) // TODO: @int
                 } else {
                     EnumVariantValue::None
                 };
                 Ok(EnumVariantDefinition{ identifier, value })
             },
             &mut enum_section, "an enum variant", "a list of enum variants", None
         )?;
         // Transfer to definition
         let enum_def = ctx.heap[definition_id].as_enum_mut();
         enum_def.variants = enum_section.into_vec();
         Ok(())
+    }
     fn visit_union_definition(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<(), ParseError> {
         consume_exact_ident(&module.source, iter, KW_UNION)?;
         let (ident_text, _) = consume_ident(&module.source, iter)?;
         // Retrieve preallocated DefinitionId
         let module_scope = SymbolScope::Module(module.root_id);
         let definition_id = ctx.symbols.get_symbol_by_name_defined_in_scope(module_scope, ident_text)
             .unwrap().variant.as_definition().definition_id;
         self.cur_definition = definition_id;
         // Parse union definition
         consume_polymorphic_vars_spilled(&module.source, iter, ctx)?;
         let mut variants_section = self.union_variants.start_section();
         consume_comma_separated(
             TokenKind::OpenCurly, TokenKind::CloseCurly, &module.source, iter, ctx,
             |source, iter, ctx| {
                 let identifier = consume_ident_interned(source, iter, ctx)?;
                 let mut close_pos = identifier.span.end;
                 let mut types_section = self.parser_types.start_section();
                 let has_embedded = maybe_consume_comma_separated(
                     TokenKind::OpenParen, TokenKind::CloseParen, source, iter, ctx,
                     |source, iter, ctx| {
                         let poly_vars = ctx.heap[definition_id].poly_vars(); // TODO: @Cleanup, this is really ugly. But rust...
                         consume_parser_type(
                             source, iter, &ctx.symbols, &ctx.heap, poly_vars,
                             module_scope, definition_id, false, 0
+                        )
                     },
                     &mut types_section, "an embedded type", Some(&mut close_pos)
                 )?;
                 let value = if has_embedded {
                     UnionVariantValue::Embedded(types_section.into_vec())
                 } else {
                     types_section.forget();
                     UnionVariantValue::None
                 };
                 Ok(UnionVariantDefinition{
                     span: InputSpan::from_positions(identifier.span.begin, close_pos),
                     identifier,
                     value
                 })
             },
             &mut variants_section, "a union variant", "a list of union variants", None
         )?;
         // Transfer to AST
         let union_def = ctx.heap[definition_id].as_union_mut();
         union_def.variants = variants_section.into_vec();
         Ok(())
+    }
     fn visit_function_definition(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<(), ParseError> {
         consume_exact_ident(&module.source, iter, KW_FUNCTION)?;
         let (ident_text, _) = consume_ident(&module.source, iter)?;
         // Retrieve preallocated DefinitionId
         let module_scope = SymbolScope::Module(module.root_id);
         let definition_id = ctx.symbols.get_symbol_by_name_defined_in_scope(module_scope, ident_text)
             .unwrap().variant.as_definition().definition_id;
         self.cur_definition = definition_id;
         consume_polymorphic_vars_spilled(&module.source, iter, ctx)?;
         // Parse function's argument list
         let mut parameter_section = self.parameters.start_section();
         consume_parameter_list(
             &module.source, iter, ctx, &mut parameter_section, module_scope, definition_id
         )?;
         let parameters = parameter_section.into_vec();
         // Consume return types
         consume_token(&module.source, iter, TokenKind::ArrowRight)?;
         let mut return_types = self.parser_types.start_section();
         let mut open_curly_pos = iter.last_valid_pos(); // bogus value
         consume_comma_separated_until(
             TokenKind::OpenCurly, &module.source, iter, ctx,
             |source, iter, ctx| {
                 let poly_vars = ctx.heap[definition_id].poly_vars(); // TODO: @Cleanup, this is really ugly. But rust...
                 consume_parser_type(source, iter, &ctx.symbols, &ctx.heap, poly_vars, module_scope, definition_id, false, 0)
             },
             &mut return_types, "a return type", Some(&mut open_curly_pos)
         )?;
         let return_types = return_types.into_vec();
         // TODO: @ReturnValues
         match return_types.len() {
 => return Err(ParseError::new_error_str_at_pos(&module.source, open_curly_pos, "expected a return type")),
 => {},
             _ => return Err(ParseError::new_error_str_at_pos(&module.source, open_curly_pos, "multiple return types are not (yet) allowed")),
+        }
         // Consume block
         let body = self.consume_block_statement_without_leading_curly(module, iter, ctx, open_curly_pos)?;
         // Assign everything in the preallocated AST node
         let function = ctx.heap[definition_id].as_function_mut();
         function.return_types = return_types;
         function.parameters = parameters;
         function.body = body;
         Ok(())
+    }
     fn visit_component_definition(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<(), ParseError> {
         let (_variant_text, _) = consume_any_ident(&module.source, iter)?;
         debug_assert!(_variant_text == KW_PRIMITIVE || _variant_text == KW_COMPOSITE);
         let (ident_text, _) = consume_ident(&module.source, iter)?;
         // Retrieve preallocated definition
         let module_scope = SymbolScope::Module(module.root_id);
         let definition_id = ctx.symbols.get_symbol_by_name_defined_in_scope(module_scope, ident_text)
             .unwrap().variant.as_definition().definition_id;
         self.cur_definition = definition_id;
         consume_polymorphic_vars_spilled(&module.source, iter, ctx)?;
         // Parse component's argument list
         let mut parameter_section = self.parameters.start_section();
         consume_parameter_list(
             &module.source, iter, ctx, &mut parameter_section, module_scope, definition_id
         )?;
         let parameters = parameter_section.into_vec();
         // Consume block
         let body = self.consume_block_statement(module, iter, ctx)?;
         // Assign everything in the AST node
         let component = ctx.heap[definition_id].as_component_mut();
         component.parameters = parameters;
         component.body = body;
         Ok(())
+    }
     /// Consumes a block statement. If the resulting statement is not a block
     /// (e.g. for a shorthand "if (expr) single_statement") then it will be
     /// wrapped in one
     fn consume_block_or_wrapped_statement(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<BlockStatementId, ParseError> {
         if Some(TokenKind::OpenCurly) == iter.next() {
             // This is a block statement
             self.consume_block_statement(module, iter, ctx)
         } else {
             // Not a block statement, so wrap it in one
             let mut statements = self.statements.start_section();
             let wrap_begin_pos = iter.last_valid_pos();
             self.consume_statement(module, iter, ctx, &mut statements)?;
             let wrap_end_pos = iter.last_valid_pos();
             debug_assert_eq!(statements.len(), 1);
             let statements = statements.into_vec();
             Ok(ctx.heap.alloc_block_statement(|this| BlockStatement{
                 this,
                 is_implicit: true,
                 span: InputSpan::from_positions(wrap_begin_pos, wrap_end_pos), // TODO: @Span
                 statements,
                 parent_scope: None,
                 relative_pos_in_parent: 0,
                 locals: Vec::new(),
                 labels: Vec::new()
             }))
+        }
+    }
     /// Consumes a statement and returns a boolean indicating whether it was a
     /// block or not.
     fn consume_statement(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx, section: &mut ScopedSection<StatementId>
     ) -> Result<(), ParseError> {
         let next = iter.next().expect("consume_statement has a next token");
         if next == TokenKind::OpenCurly {
             let id = self.consume_block_statement(module, iter, ctx)?;
             section.push(id.upcast());
         } else if next == TokenKind::Ident {
             let ident = peek_ident(&module.source, iter).unwrap();
             if ident == KW_STMT_IF {
                 // Consume if statement and place end-if statement directly
                 // after it.
                 let id = self.consume_if_statement(module, iter, ctx)?;
                 section.push(id.upcast());
                 let end_if = ctx.heap.alloc_end_if_statement(|this| EndIfStatement{
                     this, start_if: id, next: None
                 });
                 section.push(id.upcast());
                 let if_stmt = &mut ctx.heap[id];
                 if_stmt.end_if = Some(end_if);
             } else if ident == KW_STMT_WHILE {
                 let id = self.consume_while_statement(module, iter, ctx)?;
                 section.push(id.upcast());
                 let end_while = ctx.heap.alloc_end_while_statement(|this| EndWhileStatement{
                     this, start_while: id, next: None
                 });
                 section.push(id.upcast());
                 let while_stmt = &mut ctx.heap[id];
                 while_stmt.end_while = Some(end_while);
             } else if ident == KW_STMT_BREAK {
                 let id = self.consume_break_statement(module, iter, ctx)?;
                 section.push(id.upcast());
             } else if ident == KW_STMT_CONTINUE {
                 let id = self.consume_continue_statement(module, iter, ctx)?;
                 section.push(id.upcast());
             } else if ident == KW_STMT_SYNC {
                 let id = self.consume_synchronous_statement(module, iter, ctx)?;
                 section.push(id.upcast());
                 let end_sync = ctx.heap.alloc_end_synchronous_statement(|this| EndSynchronousStatement{
                     this, start_sync: id, next: None
                 });
                 let sync_stmt = &mut ctx.heap[id];
                 sync_stmt.end_sync = Some(end_sync);
             } else if ident == KW_STMT_RETURN {
                 let id = self.consume_return_statement(module, iter, ctx)?;
                 section.push(id.upcast());
             } else if ident == KW_STMT_GOTO {
                 let id = self.consume_goto_statement(module, iter, ctx)?;
                 section.push(id.upcast());
             } else if ident == KW_STMT_NEW {
                 let id = self.consume_new_statement(module, iter, ctx)?;
                 section.push(id.upcast());
             } else if ident == KW_STMT_CHANNEL {
                 let id = self.consume_channel_statement(module, iter, ctx)?;
                 section.push(id.upcast().upcast());
             } else if iter.peek() == Some(TokenKind::Colon) {
                 self.consume_labeled_statement(module, iter, ctx, section)?;
             } else {
                 // Two fallback possibilities: the first one is a memory
                 // declaration, the other one is to parse it as a regular
                 // expression. This is a bit ugly
                 if let Some((memory_stmt_id, assignment_stmt_id)) = self.maybe_consume_memory_statement(module, iter, ctx)? {
                     section.push(memory_stmt_id.upcast().upcast());
                     section.push(assignment_stmt_id.upcast());
                 } else {
                     let id = self.consume_expression_statement(module, iter, ctx)?;
                     section.push(id.upcast());
+                }
+            }
         };
         return Ok(());
+    }
     fn consume_block_statement(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<BlockStatementId, ParseError> {
         let open_span = consume_token(&module.source, iter, TokenKind::OpenCurly)?;
         self.consume_block_statement_without_leading_curly(module, iter, ctx, open_span.begin)
+    }
     fn consume_block_statement_without_leading_curly(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx, open_curly_pos: InputPosition
     ) -> Result<BlockStatementId, ParseError> {
         let mut stmt_section = self.statements.start_section();
         let mut next = iter.next();
         while next != Some(TokenKind::CloseCurly) {
             if next.is_none() {
                 return Err(ParseError::new_error_str_at_pos(
                     &module.source, iter.last_valid_pos(), "expected a statement or '}'"
                 ));
+            }
             self.consume_statement(module, iter, ctx, &mut stmt_section)?;
             next = iter.next();
+        }
         let statements = stmt_section.into_vec();
         let mut block_span = consume_token(&module.source, iter, TokenKind::CloseCurly)?;
         block_span.begin = open_curly_pos;
         Ok(ctx.heap.alloc_block_statement(|this| BlockStatement{
             this,
             is_implicit: false,
             span: block_span,
             statements,
             parent_scope: None,
             relative_pos_in_parent: 0,
             locals: Vec::new(),
             labels: Vec::new(),
         }))
+    }
     fn consume_if_statement(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<IfStatementId, ParseError> {
         let if_span = consume_exact_ident(&module.source, iter, KW_STMT_IF)?;
         consume_token(&module.source, iter, TokenKind::OpenParen)?;
         let test = self.consume_expression(module, iter, ctx)?;
         consume_token(&module.source, iter, TokenKind::CloseParen)?;
         let true_body = self.consume_block_or_wrapped_statement(module, iter, ctx)?;
         let false_body = if has_ident(&module.source, iter, KW_STMT_ELSE) {
             iter.consume();
             let false_body = self.consume_block_or_wrapped_statement(module, iter, ctx)?;
             Some(false_body)
         } else {
             None
         };
         Ok(ctx.heap.alloc_if_statement(|this| IfStatement{
             this,
             span: if_span,
             test,
             true_body,
             false_body,
             end_if: None,
         }))
+    }
     fn consume_while_statement(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<WhileStatementId, ParseError> {
         let while_span = consume_exact_ident(&module.source, iter, KW_STMT_WHILE)?;
         consume_token(&module.source, iter, TokenKind::OpenParen)?;
         let test = self.consume_expression(module, iter, ctx)?;
         consume_token(&module.source, iter, TokenKind::CloseParen)?;
         let body = self.consume_block_or_wrapped_statement(module, iter, ctx)?;
         Ok(ctx.heap.alloc_while_statement(|this| WhileStatement{
             this,
             span: while_span,
             test,
             body,
             end_while: None,
             in_sync: None,
         }))
+    }
     fn consume_break_statement(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<BreakStatementId, ParseError> {
         let break_span = consume_exact_ident(&module.source, iter, KW_STMT_BREAK)?;
         let label = if Some(TokenKind::Ident) == iter.next() {
             let label = consume_ident_interned(&module.source, iter, ctx)?;
             Some(label)
         } else {
             None
         };
         consume_token(&module.source, iter, TokenKind::SemiColon)?;
         Ok(ctx.heap.alloc_break_statement(|this| BreakStatement{
             this,
             span: break_span,
             label,
             target: None,
         }))
+    }
     fn consume_continue_statement(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<ContinueStatementId, ParseError> {
         let continue_span = consume_exact_ident(&module.source, iter, KW_STMT_CONTINUE)?;
         let label=  if Some(TokenKind::Ident) == iter.next() {
             let label = consume_ident_interned(&module.source, iter, ctx)?;
             Some(label)
         } else {
             None
         };
         consume_token(&module.source, iter, TokenKind::SemiColon)?;
         Ok(ctx.heap.alloc_continue_statement(|this| ContinueStatement{
             this,
             span: continue_span,
             label,
             target: None
         }))
+    }
     fn consume_synchronous_statement(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<SynchronousStatementId, ParseError> {
         let synchronous_span = consume_exact_ident(&module.source, iter, KW_STMT_SYNC)?;
         let body = self.consume_block_or_wrapped_statement(module, iter, ctx)?;
         Ok(ctx.heap.alloc_synchronous_statement(|this| SynchronousStatement{
             this,
             span: synchronous_span,
             body,
             end_sync: None,
             parent_scope: None,
         }))
+    }
     fn consume_return_statement(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<ReturnStatementId, ParseError> {
         let return_span = consume_exact_ident(&module.source, iter, KW_STMT_RETURN)?;
         let mut scoped_section = self.expressions.start_section();
         consume_comma_separated_until(
             TokenKind::SemiColon, &module.source, iter, ctx,
             |_source, iter, ctx| self.consume_expression(module, iter, ctx),
             &mut scoped_section, "a return expression", None
         )?;
         let expressions = scoped_section.into_vec();
         if expressions.is_empty() {
             return Err(ParseError::new_error_str_at_span(&module.source, return_span, "expected at least one return value"));
         } else if expressions.len() > 1 {
             return Err(ParseError::new_error_str_at_span(&module.source, return_span, "multiple return values are not (yet) supported"))
+        }
         Ok(ctx.heap.alloc_return_statement(|this| ReturnStatement{
             this,
             span: return_span,
             expressions
         }))
+    }
     fn consume_goto_statement(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<GotoStatementId, ParseError> {
         let goto_span = consume_exact_ident(&module.source, iter, KW_STMT_GOTO)?;
         let label = consume_ident_interned(&module.source, iter, ctx)?;
         consume_token(&module.source, iter, TokenKind::SemiColon)?;
         Ok(ctx.heap.alloc_goto_statement(|this| GotoStatement{
             this,
             span: goto_span,
             label,
             target: None
         }))
+    }
     fn consume_new_statement(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<NewStatementId, ParseError> {
         let new_span = consume_exact_ident(&module.source, iter, KW_STMT_NEW)?;
         // TODO: @Cleanup, should just call something like consume_component_expression-ish
         let start_pos = iter.last_valid_pos();
         let expression_id = self.consume_primary_expression(module, iter, ctx)?;
         let expression = &ctx.heap[expression_id];
         let mut valid = false;
         let mut call_id = CallExpressionId::new_invalid();
         if let Expression::Call(expression) = expression {
             // Allow both components and functions, as it makes more sense to
             // check their correct use in the validation and linking pass
             if expression.method == Method::UserComponent || expression.method == Method::UserFunction {
                 call_id = expression.this;
                 valid = true;
+            }
+        }
         if !valid {
             return Err(ParseError::new_error_str_at_span(
                 &module.source, InputSpan::from_positions(start_pos, iter.last_valid_pos()), "expected a call expression"
             ));
+        }
         consume_token(&module.source, iter, TokenKind::SemiColon)?;
         debug_assert!(!call_id.is_invalid());
         Ok(ctx.heap.alloc_new_statement(|this| NewStatement{
             this,
             span: new_span,
             expression: call_id,
             next: None
         }))
+    }
     fn consume_channel_statement(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<ChannelStatementId, ParseError> {
         // Consume channel specification
         let channel_span = consume_exact_ident(&module.source, iter, KW_STMT_CHANNEL)?;
         let channel_type = if Some(TokenKind::OpenAngle) == iter.next() {
             // Retrieve the type of the channel, we're cheating a bit here by
             // consuming the first '<' and setting the initial angle depth to 1
             // such that our final '>' will be consumed as well.
             iter.consume();
             let definition_id = self.cur_definition;
             let poly_vars = ctx.heap[definition_id].poly_vars();
             consume_parser_type(
                 &module.source, iter, &ctx.symbols, &ctx.heap,
                 &poly_vars, SymbolScope::Module(module.root_id), definition_id,
                 true, 1
             )?
         } else {
             // Assume inferred
             ParserType{ elements: vec![ParserTypeElement{
                 full_span: channel_span, // TODO: @Span fix
                 variant: ParserTypeVariant::Inferred
             }]}
         };
         let from_identifier = consume_ident_interned(&module.source, iter, ctx)?;
         consume_token(&module.source, iter, TokenKind::ArrowRight)?;
         let to_identifier = consume_ident_interned(&module.source, iter, ctx)?;
         consume_token(&module.source, iter, TokenKind::SemiColon)?;
         // Construct ports
         let from = ctx.heap.alloc_local(|this| Local{
             this,
             identifier: from_identifier,
             parser_type: channel_type.clone(),
             relative_pos_in_block: 0,
         });
         let to = ctx.heap.alloc_local(|this| Local{
             this,
             identifier: to_identifier,
             parser_type: channel_type,
             relative_pos_in_block: 0,
         });
         // Construct the channel
         Ok(ctx.heap.alloc_channel_statement(|this| ChannelStatement{
             this,
             span: channel_span,
             from, to,
             relative_pos_in_block: 0,
             next: None,
         }))
+    }
     fn consume_labeled_statement(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx, section: &mut ScopedSection<StatementId>
     ) -> Result<(), ParseError> {
         let label = consume_ident_interned(&module.source, iter, ctx)?;
         consume_token(&module.source, iter, TokenKind::Colon)?;
         // Not pretty: consume_statement may produce more than one statement.
         // The values in the section need to be in the correct order if some
         // kind of outer block is consumed, so we take another section, push
         // the expressions in that one, and then allocate the labeled statement.
         let mut inner_section = self.statements.start_section();
         self.consume_statement(module, iter, ctx, &mut inner_section)?;
         debug_assert!(inner_section.len() >= 1);
         let stmt_id = ctx.heap.alloc_labeled_statement(|this| LabeledStatement {
             this,
             label,
             body: inner_section[0],
             relative_pos_in_block: 0,
             in_sync: None,
         });
         if inner_section.len() == 1 {
             // Produce the labeled statement pointing to the first statement.
             // This is by far the most common case.
             inner_section.forget();
             section.push(stmt_id.upcast());
         } else {
             // Produce the labeled statement using the first statement, and push
             // the remaining ones at the end.
             let inner_statements = inner_section.into_vec();
             section.push(stmt_id.upcast());
             for idx in 1..inner_statements.len() {
                 section.push(inner_statements[idx])
+            }
+        }
         Ok(())
+    }
     fn maybe_consume_memory_statement(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<Option<(MemoryStatementId, ExpressionStatementId)>, ParseError> {
         // This is a bit ugly. It would be nicer if we could somehow
         // consume the expression with a type hint if we do get a valid
         // type, but we don't get an identifier following it
         let iter_state = iter.save();
         let definition_id = self.cur_definition;
         let poly_vars = ctx.heap[definition_id].poly_vars();
         let parser_type = consume_parser_type(
             &module.source, iter, &ctx.symbols, &ctx.heap, poly_vars,
             SymbolScope::Definition(definition_id), definition_id, true, 0
         );
         if let Ok(parser_type) = parser_type {
             if Some(TokenKind::Ident) == iter.next() {
                 // Assume this is a proper memory statement
                 let identifier = consume_ident_interned(&module.source, iter, ctx)?;
                 let memory_span = InputSpan::from_positions(parser_type.elements[0].full_span.begin, identifier.span.end);
                 let assign_span = consume_token(&module.source, iter, TokenKind::Equal)?;
                 let initial_expr_begin_pos = iter.last_valid_pos();
                 let initial_expr_id = self.consume_expression(module, iter, ctx)?;
                 let initial_expr_end_pos = iter.last_valid_pos();
                 consume_token(&module.source, iter, TokenKind::SemiColon)?;
                 // Allocate the memory statement with the variable
                 let local_id = ctx.heap.alloc_local(|this| Local{
                     this,
                     identifier: identifier.clone(),
                     parser_type,
                     relative_pos_in_block: 0,
                 });
                 let memory_stmt_id = ctx.heap.alloc_memory_statement(|this| MemoryStatement{
                     this,
                     span: memory_span,
                     variable: local_id,
                     next: None
                 });
                 // Allocate the initial assignment
                 let variable_expr_id = ctx.heap.alloc_variable_expression(|this| VariableExpression{
                     this,
                     identifier,
                     declaration: None,
                     parent: ExpressionParent::None,
                     concrete_type: Default::default()
                 });
                 let assignment_expr_id = ctx.heap.alloc_assignment_expression(|this| AssignmentExpression{
                     this,
                     span: assign_span,
                     left: variable_expr_id.upcast(),
                     operation: AssignmentOperator::Set,
                     right: initial_expr_id,
                     parent: ExpressionParent::None,
                     concrete_type: Default::default(),
                 });
                 let assignment_stmt_id = ctx.heap.alloc_expression_statement(|this| ExpressionStatement{
                     this,
                     span: InputSpan::from_positions(initial_expr_begin_pos, initial_expr_end_pos),
                     expression: assignment_expr_id.upcast(),
                     next: None,
                 });
                 return Ok(Some((memory_stmt_id, assignment_stmt_id)))
+            }
+        }
         // If here then one of the preconditions for a memory statement was not
         // met. So recover the iterator and return
         iter.load(iter_state);
         Ok(None)
+    }
     fn consume_expression_statement(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<ExpressionStatementId, ParseError> {
         let start_pos = iter.last_valid_pos();
         let expression = self.consume_expression(module, iter, ctx)?;
         let end_pos = iter.last_valid_pos();
         consume_token(&module.source, iter, TokenKind::SemiColon)?;
         Ok(ctx.heap.alloc_expression_statement(|this| ExpressionStatement{
             this,
             span: InputSpan::from_positions(start_pos, end_pos),
             expression,
             next: None,
         }))
+    }
     //--------------------------------------------------------------------------
     // Expression Parsing
     //--------------------------------------------------------------------------
     fn consume_expression(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<ExpressionId, ParseError> {
         self.consume_assignment_expression(module, iter, ctx)
+    }
     fn consume_assignment_expression(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<ExpressionId, ParseError> {
         // Utility to convert token into assignment operator
         fn parse_assignment_operator(token: Option<TokenKind>) -> Option<AssignmentOperator> {
             use TokenKind as TK;
             use AssignmentOperator as AO;
             if token.is_none() {
                 return None
+            }
             match token.unwrap() {
                 TK::Equal               => Some(AO::Set),
                 TK::StarEquals          => Some(AO::Multiplied),
                 TK::SlashEquals         => Some(AO::Divided),
                 TK::PercentEquals       => Some(AO::Remained),
                 TK::PlusEquals          => Some(AO::Added),
                 TK::MinusEquals         => Some(AO::Subtracted),
                 TK::ShiftLeftEquals     => Some(AO::ShiftedLeft),
                 TK::ShiftRightEquals    => Some(AO::ShiftedRight),
                 TK::AndEquals           => Some(AO::BitwiseAnded),
                 TK::CaretEquals         => Some(AO::BitwiseXored),
                 TK::OrEquals            => Some(AO::BitwiseOred),
                 _                       => None
+            }
+        }
         let expr = self.consume_conditional_expression(module, iter, ctx)?;
         if let Some(operation) = parse_assignment_operator(iter.next()) {
             let span = iter.next_span();
             iter.consume();
             let left = expr;
             let right = self.consume_expression(module, iter, ctx)?;
             Ok(ctx.heap.alloc_assignment_expression(|this| AssignmentExpression{
                 this, span, left, operation, right,
                 parent: ExpressionParent::None,
                 concrete_type: ConcreteType::default(),
             }).upcast())
         } else {
             Ok(expr)
+        }
+    }
     fn consume_conditional_expression(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<ExpressionId, ParseError> {
         let result = self.consume_concat_expression(module, iter, ctx)?;
         if let Some(TokenKind::Question) = iter.next() {
             let span = iter.next_span();
             iter.consume();
             let test = result;
             let true_expression = self.consume_expression(module, iter, ctx)?;
             consume_token(&module.source, iter, TokenKind::Colon)?;
             let false_expression = self.consume_expression(module, iter, ctx)?;
             Ok(ctx.heap.alloc_conditional_expression(|this| ConditionalExpression{
                 this, span, test, true_expression, false_expression,
                 parent: ExpressionParent::None,
                 concrete_type: ConcreteType::default(),
             }).upcast())
         } else {
             Ok(result)
+        }
+    }
     fn consume_concat_expression(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<ExpressionId, ParseError> {
         self.consume_generic_binary_expression(
             module, iter, ctx,
             |token| match token {
                 Some(TokenKind::At) => Some(BinaryOperator::Concatenate),
                 _ => None
             },
             Self::consume_logical_or_expression
+        )
+    }
     fn consume_logical_or_expression(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<ExpressionId, ParseError> {
         self.consume_generic_binary_expression(
             module, iter, ctx,
             |token| match token {
                 Some(TokenKind::OrOr) => Some(BinaryOperator::LogicalOr),
                 _ => None
             },
             Self::consume_logical_and_expression
+        )
+    }
     fn consume_logical_and_expression(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<ExpressionId, ParseError> {
         self.consume_generic_binary_expression(
             module, iter, ctx,
             |token| match token {
                 Some(TokenKind::AndAnd) => Some(BinaryOperator::LogicalAnd),
                 _ => None
             },
             Self::consume_bitwise_or_expression
+        )
+    }
     fn consume_bitwise_or_expression(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<ExpressionId, ParseError> {
         self.consume_generic_binary_expression(
             module, iter, ctx,
             |token| match token {
                 Some(TokenKind::Or) => Some(BinaryOperator::BitwiseOr),
                 _ => None
             },
             Self::consume_bitwise_xor_expression
+        )
+    }
     fn consume_bitwise_xor_expression(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<ExpressionId, ParseError> {
         self.consume_generic_binary_expression(
             module, iter, ctx,
             |token| match token {
                 Some(TokenKind::Caret) => Some(BinaryOperator::BitwiseXor),
                 _ => None
             },
             Self::consume_bitwise_and_expression
+        )
+    }
     fn consume_bitwise_and_expression(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<ExpressionId, ParseError> {
         self.consume_generic_binary_expression(
             module, iter, ctx,
             |token| match token {
                 Some(TokenKind::And) => Some(BinaryOperator::BitwiseAnd),
                 _ => None
             },
             Self::consume_equality_expression
+        )
+    }
     fn consume_equality_expression(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<ExpressionId, ParseError> {
         self.consume_generic_binary_expression(
             module, iter, ctx,
             |token| match token {
                 Some(TokenKind::EqualEqual) => Some(BinaryOperator::Equality),
                 Some(TokenKind::NotEqual) => Some(BinaryOperator::Inequality),
                 _ => None
             },
             Self::consume_relational_expression
+        )
+    }
     fn consume_relational_expression(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<ExpressionId, ParseError> {
         self.consume_generic_binary_expression(
             module, iter, ctx,
             |token| match token {
                 Some(TokenKind::OpenAngle) => Some(BinaryOperator::LessThan),
                 Some(TokenKind::CloseAngle) => Some(BinaryOperator::GreaterThan),
                 Some(TokenKind::LessEquals) => Some(BinaryOperator::LessThanEqual),
                 Some(TokenKind::GreaterEquals) => Some(BinaryOperator::GreaterThanEqual),
                 _ => None
             },
             Self::consume_shift_expression
+        )
+    }
     fn consume_shift_expression(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<ExpressionId, ParseError> {
         self.consume_generic_binary_expression(
             module, iter, ctx,
             |token| match token {
                 Some(TokenKind::ShiftLeft) => Some(BinaryOperator::ShiftLeft),
                 Some(TokenKind::ShiftRight) => Some(BinaryOperator::ShiftRight),
                 _ => None
             },
             Self::consume_add_or_subtract_expression
+        )
+    }
     fn consume_add_or_subtract_expression(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<ExpressionId, ParseError> {
         self.consume_generic_binary_expression(
             module, iter, ctx,
             |token| match token {
                 Some(TokenKind::Plus) => Some(BinaryOperator::Add),
                 Some(TokenKind::Minus) => Some(BinaryOperator::Subtract),
                 _ => None,
             },
             Self::consume_multiply_divide_or_modulus_expression
+        )
+    }
     fn consume_multiply_divide_or_modulus_expression(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<ExpressionId, ParseError> {
         self.consume_generic_binary_expression(
             module, iter, ctx,
             |token| match token {
                 Some(TokenKind::Star) => Some(BinaryOperator::Multiply),
                 Some(TokenKind::Slash) => Some(BinaryOperator::Divide),
                 Some(TokenKind::Percent) => Some(BinaryOperator::Remainder),
                 _ => None
             },
             Self::consume_prefix_expression
+        )
+    }
     fn consume_prefix_expression(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<ExpressionId, ParseError> {
         fn parse_prefix_token(token: Option<TokenKind>) -> Option<UnaryOperation> {
             use TokenKind as TK;
             use UnaryOperation as UO;
             match token {
                 Some(TK::Plus) => Some(UO::Positive),
                 Some(TK::Minus) => Some(UO::Negative),
                 Some(TK::PlusPlus) => Some(UO::PreIncrement),
                 Some(TK::MinusMinus) => Some(UO::PreDecrement),
                 Some(TK::Tilde) => Some(UO::BitwiseNot),
                 Some(TK::Exclamation) => Some(UO::LogicalNot),
                 _ => None
+            }
+        }
         if let Some(operation) = parse_prefix_token(iter.next()) {
             let span = iter.next_span();
             iter.consume();
             let expression = self.consume_prefix_expression(module, iter, ctx)?;
             Ok(ctx.heap.alloc_unary_expression(|this| UnaryExpression {
                 this, span, operation, expression,
                 parent: ExpressionParent::None,
                 concrete_type: ConcreteType::default()
             }).upcast())
         } else {
             self.consume_postfix_expression(module, iter, ctx)
+        }
+    }
     fn consume_postfix_expression(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<ExpressionId, ParseError> {
         fn has_matching_postfix_token(token: Option<TokenKind>) -> bool {
             use TokenKind as TK;
             if token.is_none() { return false; }
             match token.unwrap() {
                 TK::PlusPlus | TK::MinusMinus | TK::OpenSquare | TK::Dot => true,
                 _ => false
+            }
+        }
         let mut result = self.consume_primary_expression(module, iter, ctx)?;
         let mut next = iter.next();
         while has_matching_postfix_token(next) {
             let token = next.unwrap();
             let mut span = iter.next_span();
             iter.consume();
             if token == TokenKind::PlusPlus {
                 result = ctx.heap.alloc_unary_expression(|this| UnaryExpression{
                     this, span,
                     operation: UnaryOperation::PostIncrement,
                     expression: result,
                     parent: ExpressionParent::None,
                     concrete_type: ConcreteType::default()
                 }).upcast();
             } else if token == TokenKind::MinusMinus {
                 result = ctx.heap.alloc_unary_expression(|this| UnaryExpression{
                     this, span,
                     operation: UnaryOperation::PostDecrement,
                     expression: result,
                     parent: ExpressionParent::None,
                     concrete_type: ConcreteType::default()
                 }).upcast();
             } else if token == TokenKind::OpenSquare {
                 let subject = result;
                 let from_index = self.consume_expression(module, iter, ctx)?;
                 // Check if we have an indexing or slicing operation
                 next = iter.next();
                 if Some(TokenKind::DotDot) == next {
                     iter.consume();
                     let to_index = self.consume_expression(module, iter, ctx)?;
                     let end_span = consume_token(&module.source, iter, TokenKind::CloseSquare)?;
                     span.end = end_span.end;
                     result = ctx.heap.alloc_slicing_expression(|this| SlicingExpression{
                         this, span, subject, from_index, to_index,
                         parent: ExpressionParent::None,
                         concrete_type: ConcreteType::default()
                     }).upcast();
                 } else if Some(TokenKind::CloseSquare) == next {
                     let end_span = consume_token(&module.source, iter, TokenKind::CloseSquare)?;
                     span.end = end_span.end;
                     result = ctx.heap.alloc_indexing_expression(|this| IndexingExpression{
                         this, span, subject,
                         index: from_index,
                         parent: ExpressionParent::None,
                         concrete_type: ConcreteType::default()
                     }).upcast();
                 } else {
                     return Err(ParseError::new_error_str_at_pos(
                         &module.source, iter.last_valid_pos(), "unexpected token: expected ']' or '..'"
                     ));
+                }
             } else {
                 debug_assert_eq!(token, TokenKind::Dot);
                 let subject = result;
                 let (field_text, field_span) = consume_ident(&module.source, iter)?;
                 let field = if field_text == b"length" {
                     Field::Length
                 } else {
                     let value = ctx.pool.intern(field_text);
                     let identifier = Identifier{ value, span: field_span };
                     Field::Symbolic(FieldSymbolic{ identifier, definition: None, field_idx: 0 })
                 };
                 result = ctx.heap.alloc_select_expression(|this| SelectExpression{
                     this, span, subject, field,
                     parent: ExpressionParent::None,
                     concrete_type: ConcreteType::default()
                 }).upcast();
+            }
             next = iter.next();
+        }
         Ok(result)
+    }
     fn consume_primary_expression(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<ExpressionId, ParseError> {
         let next = iter.next();
         let result = if next == Some(TokenKind::OpenParen) {
             // Expression between parentheses
             iter.consume();
             let result = self.consume_expression(module, iter, ctx)?;
             consume_token(&module.source, iter, TokenKind::CloseParen)?;
             result
         } else if next == Some(TokenKind::OpenCurly) {
             // Array literal
             let (start_pos, mut end_pos) = iter.next_positions();
             let mut scoped_section = self.expressions.start_section();
             consume_comma_separated(
                 TokenKind::OpenCurly, TokenKind::CloseCurly, &module.source, iter, ctx,
                 |_source, iter, ctx| self.consume_expression(module, iter, ctx),
                 &mut scoped_section, "an expression", "a list of expressions", Some(&mut end_pos)
             )?;
             ctx.heap.alloc_literal_expression(|this| LiteralExpression{
                 this,
                 span: InputSpan::from_positions(start_pos, end_pos),
                 value: Literal::Array(scoped_section.into_vec()),
                 parent: ExpressionParent::None,
                 concrete_type: ConcreteType::default(),
             }).upcast()
         } else if next == Some(TokenKind::Integer) {
             let (literal, span) = consume_integer_literal(&module.source, iter, &mut self.buffer)?;
             ctx.heap.alloc_literal_expression(|this| LiteralExpression{
                 this, span,
                 value: Literal::Integer(LiteralInteger{ unsigned_value: literal, negated: false }),
                 parent: ExpressionParent::None,
                 concrete_type: ConcreteType::default(),
             }).upcast()
         } else if next == Some(TokenKind::String) {
             let span = consume_string_literal(&module.source, iter, &mut self.buffer)?;
             let interned = ctx.pool.intern(self.buffer.as_bytes());
             ctx.heap.alloc_literal_expression(|this| LiteralExpression{
                 this, span,
                 value: Literal::String(interned),
                 parent: ExpressionParent::None,
                 concrete_type: ConcreteType::default(),
             }).upcast()
         } else if next == Some(TokenKind::Character) {
             let (character, span) = consume_character_literal(&module.source, iter)?;
             ctx.heap.alloc_literal_expression(|this| LiteralExpression{
                 this, span,
                 value: Literal::Character(character),
                 parent: ExpressionParent::None,
                 concrete_type: ConcreteType::default(),
             }).upcast()
         } else if next == Some(TokenKind::Ident) {
             // May be a variable, a type instantiation or a function call. If we
             // have a single identifier that we cannot find in the type table
             // then we're going to assume that we're dealing with a variable.
             let ident_span = iter.next_span();
             let ident_text = module.source.section_at_span(ident_span);
             let symbol = ctx.symbols.get_symbol_by_name(SymbolScope::Module(module.root_id), ident_text);
             if symbol.is_some() {
                 // The first bit looked like a symbol, so we're going to follow
                 // that all the way through, assume we arrive at some kind of
                 // function call or type instantiation
                 use ParserTypeVariant as PTV;
                 let symbol_scope = SymbolScope::Definition(self.cur_definition);
                 let poly_vars = ctx.heap[self.cur_definition].poly_vars();
                 let parser_type = consume_parser_type(
                     &module.source, iter, &ctx.symbols, &ctx.heap, poly_vars, symbol_scope,
                     self.cur_definition, true, 0
                 )?;
                 debug_assert!(!parser_type.elements.is_empty());
                 match parser_type.elements[0].variant {
                     PTV::Definition(target_definition_id, _) => {
                         let definition = &ctx.heap[target_definition_id];
                         match definition {
                             Definition::Struct(_) => {
                                 // Struct literal
                                 let mut last_token = iter.last_valid_pos();
                                 let mut struct_fields = Vec::new();
                                 consume_comma_separated(
                                     TokenKind::OpenCurly, TokenKind::CloseCurly, &module.source, iter, ctx,
                                     |source, iter, ctx| {
                                         let identifier = consume_ident_interned(source, iter, ctx)?;
                                         consume_token(source, iter, TokenKind::Colon)?;
                                         let value = self.consume_expression(module, iter, ctx)?;
                                         Ok(LiteralStructField{ identifier, value, field_idx: 0 })
                                     },
-                                    &mut struct_fields, "a struct field", "a list of struct field", Some(&mut last_token)
+                                    &mut struct_fields, "a struct field", "a list of struct fields", Some(&mut last_token)
                                 )?;
                                 ctx.heap.alloc_literal_expression(|this| LiteralExpression{
                                     this,
                                     span: InputSpan::from_positions(ident_span.begin, last_token),
                                     value: Literal::Struct(LiteralStruct{
                                         parser_type,
                                         fields: struct_fields,
                                         definition: target_definition_id,
                                     }),
                                     parent: ExpressionParent::None,
                                     concrete_type: ConcreteType::default(),
                                 }).upcast()
                             },
                             Definition::Enum(_) => {
                                 // Enum literal: consume the variant
                                 consume_token(&module.source, iter, TokenKind::ColonColon)?;
                                 let variant = consume_ident_interned(&module.source, iter, ctx)?;
                                 ctx.heap.alloc_literal_expression(|this| LiteralExpression{
                                     this,
                                     span: InputSpan::from_positions(ident_span.begin, variant.span.end),
                                     value: Literal::Enum(LiteralEnum{
                                         parser_type,
                                         variant,
                                         definition: target_definition_id,
                                         variant_idx: 0
                                     }),
                                     parent: ExpressionParent::None,
                                     concrete_type: ConcreteType::default()
                                 }).upcast()
                             },
                             Definition::Union(_) => {
                                 // Union literal: consume the variant
                                 consume_token(&module.source, iter, TokenKind::ColonColon)?;
                                 let variant = consume_ident_interned(&module.source, iter, ctx)?;
                                 // Consume any possible embedded values
                                 let mut end_pos = iter.last_valid_pos();
                                 let values = self.consume_expression_list(module, iter, ctx, Some(&mut end_pos))?;
                                 let mut end_pos = variant.span.end;
                                 let values = if Some(TokenKind::OpenParen) == iter.next() {
                                     self.consume_expression_list(module, iter, ctx, Some(&mut end_pos))?
                                 } else {
                                     Vec::new()
                                 };
                                 ctx.heap.alloc_literal_expression(|this| LiteralExpression{
                                     this,
                                     span: InputSpan::from_positions(ident_span.begin, end_pos),
                                     value: Literal::Union(LiteralUnion{
                                         parser_type, variant, values,
                                         definition: target_definition_id,
                                         variant_idx: 0,
                                     }),
                                     parent: ExpressionParent::None,
                                     concrete_type: ConcreteType::default()
                                 }).upcast()
                             },
                             Definition::Component(_) => {
                                 // Component instantiation
                                 let arguments = self.consume_expression_list(module, iter, ctx, None)?;
                                 ctx.heap.alloc_call_expression(|this| CallExpression{
                                     this,
                                     span: parser_type.elements[0].full_span, // TODO: @Span fix
                                     parser_type,
                                     method: Method::UserComponent,
                                     arguments,
                                     definition: target_definition_id,
                                     parent: ExpressionParent::None,
                                     concrete_type: ConcreteType::default(),
                                 }).upcast()
                             },
                             Definition::Function(function_definition) => {
                                 // Check whether it is a builtin function
                                 let method = if function_definition.builtin {
                                     match function_definition.identifier.value.as_str() {
                                         "get" => Method::Get,
                                         "put" => Method::Put,
                                         "fires" => Method::Fires,
                                         "create" => Method::Create,
                                         "length" => Method::Length,
                                         "assert" => Method::Assert,
                                         _ => unreachable!(),
+                                    }
                                 } else {
                                     Method::UserFunction
                                 };
                                 // Function call: consume the arguments
                                 let arguments = self.consume_expression_list(module, iter, ctx, None)?;
                                 ctx.heap.alloc_call_expression(|this| CallExpression{
                                     this,
                                     span: parser_type.elements[0].full_span, // TODO: @Span fix
                                     parser_type,
                                     method,
                                     arguments,
                                     definition: target_definition_id,
                                     parent: ExpressionParent::None,
                                     concrete_type: ConcreteType::default(),
                                 }).upcast()
+                            }
+                        }
                     },
                     _ => {
                         // TODO: Casting expressions
                         return Err(ParseError::new_error_str_at_span(
                             &module.source, parser_type.elements[0].full_span,
                             "unexpected type in expression, note that casting expressions are not yet implemented"
                         ))
+                    }
+                }
             } else {
                 // Check for builtin keywords or builtin functions
                 if ident_text == KW_LIT_NULL || ident_text == KW_LIT_TRUE || ident_text == KW_LIT_FALSE {
                     iter.consume();
                     // Parse builtin literal
                     let value = match ident_text {
                         KW_LIT_NULL => Literal::Null,
                         KW_LIT_TRUE => Literal::True,
                         KW_LIT_FALSE => Literal::False,
                         _ => unreachable!(),
                     };
                     ctx.heap.alloc_literal_expression(|this| LiteralExpression{
                         this,
                         span: ident_span,
                         value,
                         parent: ExpressionParent::None,
                         concrete_type: ConcreteType::default(),
                     }).upcast()
                 } else {
                     // I'm a bit unsure about this. One may as well have wrongfully
                     // typed `TypeWithTypo<Subtype>::`, then we assume that
                     // `TypeWithTypo` is a variable. So might want to come back to
                     // this later to do some silly heuristics.
                     // Not a builtin literal, but also not a known type. So we
                     // assume it is a variable expression. Although if we do,
                     // then if a programmer mistyped a struct/function name the
                     // error messages will be rather cryptic. For polymorphic
                     // arguments we can't really do anything at all (because it
                     // uses the '<' token). In the other cases we try to provide
                     // a better error message.
                     iter.consume();
                     if Some(TokenKind::ColonColon) == iter.next() {
                     let next = iter.next();
                     if Some(TokenKind::ColonColon) == next {
                         return Err(ParseError::new_error_str_at_span(&module.source, ident_span, "unknown identifier"));
                     } else if Some(TokenKind::OpenParen) == next {
                         return Err(ParseError::new_error_str_at_span(
                             &module.source, ident_span,
                             "unknown identifier, did you mistype a union variant's or a function's name?"
                         ));
                     } else if Some(TokenKind::OpenCurly) == next {
                         return Err(ParseError::new_error_str_at_span(
                             &module.source, ident_span,
                             "unknown identifier, did you mistype a struct type's name?"
                         ))
+                    }
                     let ident_text = ctx.pool.intern(ident_text);
                     let identifier = Identifier { span: ident_span, value: ident_text };
                     ctx.heap.alloc_variable_expression(|this| VariableExpression {
                         this,
                         identifier,
                         declaration: None,
                         parent: ExpressionParent::None,
                         concrete_type: ConcreteType::default()
                     }).upcast()
+                }
+            }
         } else {
             return Err(ParseError::new_error_str_at_pos(
                 &module.source, iter.last_valid_pos(), "expected an expression"
             ));
         };
         Ok(result)
+    }
     //--------------------------------------------------------------------------
     // Expression Utilities
     //--------------------------------------------------------------------------
     #[inline]
     fn consume_generic_binary_expression<
         M: Fn(Option<TokenKind>) -> Option<BinaryOperator>,
         F: Fn(&mut PassDefinitions, &Module, &mut TokenIter, &mut PassCtx) -> Result<ExpressionId, ParseError>
     >(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx, match_fn: M, higher_precedence_fn: F
     ) -> Result<ExpressionId, ParseError> {
         let mut result = higher_precedence_fn(self, module, iter, ctx)?;
         while let Some(operation) = match_fn(iter.next()) {
             let span = iter.next_span();
             iter.consume();
             let left = result;
             let right = higher_precedence_fn(self, module, iter, ctx)?;
             result = ctx.heap.alloc_binary_expression(|this| BinaryExpression{
                 this, span, left, operation, right,
                 parent: ExpressionParent::None,
                 concrete_type: ConcreteType::default()
             }).upcast();
+        }
         Ok(result)
+    }
     #[inline]
     fn consume_expression_list(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx, end_pos: Option<&mut InputPosition>
     ) -> Result<Vec<ExpressionId>, ParseError> {
         let mut section = self.expressions.start_section();
         consume_comma_separated(
             TokenKind::OpenParen, TokenKind::CloseParen, &module.source, iter, ctx,
             |_source, iter, ctx| self.consume_expression(module, iter, ctx),
             &mut section, "an expression", "a list of expressions", end_pos
         )?;
         Ok(section.into_vec())
+    }
+}
 /// Consumes a type. A type always starts with an identifier which may indicate
 /// a builtin type or a user-defined type. The fact that it may contain
 /// polymorphic arguments makes it a tree-like structure. Because we cannot rely
 /// on knowing the exact number of polymorphic arguments we do not check for
 /// these.
 ///
 /// Note that the first depth index is used as a hack.
 // TODO: @Optimize, @Span fix
+// TODO: @Optimize, @Span fix, @Cleanup
 fn consume_parser_type(
     source: &InputSource, iter: &mut TokenIter, symbols: &SymbolTable, heap: &Heap, poly_vars: &[Identifier],
     cur_scope: SymbolScope, wrapping_definition: DefinitionId, allow_inference: bool, first_angle_depth: i32,
 ) -> Result<ParserType, ParseError> {
     struct Entry{
         element: ParserTypeElement,
         depth: i32,
+    }
     // After parsing the array modified "[]", we need to insert an array type
     // before the most recently parsed type.
     fn insert_array_before(elements: &mut Vec<Entry>, depth: i32, span: InputSpan) {
         let index = elements.iter().rposition(|e| e.depth == depth).unwrap();
         elements.insert(index, Entry{
             element: ParserTypeElement{ full_span: span, variant: ParserTypeVariant::Array },
             depth,
         });
+    }
     // Most common case we just have one type, perhaps with some array
     // annotations.
     // annotations. This is both the hot-path, and simplifies the state machine
     // that follows and is responsible for parsing more complicated types.
     let element = consume_parser_type_ident(source, iter, symbols, heap, poly_vars, cur_scope, wrapping_definition, allow_inference)?;
     if iter.next() != Some(TokenKind::OpenAngle) {
         let num_embedded = element.variant.num_embedded();
         let mut num_array = 0;
         while iter.next() == Some(TokenKind::OpenSquare) {
             iter.consume();
             consume_token(source, iter, TokenKind::CloseSquare)?;
             num_array += 1;
+        }
         let array_span = element.full_span;
         let mut elements = Vec::with_capacity(num_array + 1);
+        let mut elements = Vec::with_capacity(num_array + num_embedded + 1);
         for _ in 0..num_array {
             elements.push(ParserTypeElement{ full_span: array_span, variant: ParserTypeVariant::Array });
+        }
         elements.push(element);
         if num_embedded != 0 {
             if !allow_inference {
                 return Err(ParseError::new_error_str_at_span(source, array_span, "type inference is not allowed here"));
+            }
             for _ in 0..num_embedded {
                 elements.push(ParserTypeElement { full_span: array_span, variant: ParserTypeVariant::Inferred });
+            }
+        }
         return Ok(ParserType{ elements });
     };
     // We have a polymorphic specification. So we start by pushing the item onto
     // our stack, then start adding entries together with the angle-brace depth
     // at which they're found.
     let mut elements = Vec::new();
     elements.push(Entry{ element, depth: 0 });
     // Start out with the first '<' consumed.
     iter.consume();
     enum State { Ident, Open, Close, Comma }
     let mut state = State::Open;
     let mut angle_depth = first_angle_depth + 1;
     loop {
         let next = iter.next();
         match state {
             State::Ident => {
                 // Just parsed an identifier, may expect comma, angled braces,
                 // or the tokens indicating an array
                 if Some(TokenKind::OpenAngle) == next {
                     angle_depth += 1;
                     state = State::Open;
                 } else if Some(TokenKind::CloseAngle) == next {
                     angle_depth -= 1;
                     state = State::Close;
                 } else if Some(TokenKind::ShiftRight) == next {
                     angle_depth -= 2;
                     state = State::Close;
                 } else if Some(TokenKind::Comma) == next {
                     state = State::Comma;
                 } else if Some(TokenKind::OpenSquare) == next {
                     let (start_pos, _) = iter.next_positions();
                     iter.consume(); // consume opening square
                     if iter.next() != Some(TokenKind::CloseSquare) {
                         return Err(ParseError::new_error_str_at_pos(
                             source, iter.last_valid_pos(),
                             "unexpected token: expected ']'"
                         ));
+                    }
                     let (_, end_pos) = iter.next_positions();
                     let array_span = InputSpan::from_positions(start_pos, end_pos);
                     insert_array_before(&mut elements, angle_depth, array_span);
                 } else {
                     return Err(ParseError::new_error_str_at_pos(
                         source, iter.last_valid_pos(),
                         "unexpected token: expected '<', '>', ',' or '['")
                     );
+                }
                 iter.consume();
             },
             State::Open => {
                 // Just parsed an opening angle bracket, expecting an identifier
                 let element = consume_parser_type_ident(source, iter, symbols, heap, poly_vars, cur_scope, wrapping_definition, allow_inference)?;
                 elements.push(Entry{ element, depth: angle_depth });
                 state = State::Ident;
             },
             State::Close => {
                 // Just parsed 1 or 2 closing angle brackets, expecting comma,
                 // more closing brackets or the tokens indicating an array
                 if Some(TokenKind::Comma) == next {
                     state = State::Comma;
                 } else if Some(TokenKind::CloseAngle) == next {
                     angle_depth -= 1;
                     state = State::Close;
                 } else if Some(TokenKind::ShiftRight) == next {
                     angle_depth -= 2;
                     state = State::Close;
                 } else if Some(TokenKind::OpenSquare) == next {
                     let (start_pos, _) = iter.next_positions();
                     iter.consume();
                     if iter.next() != Some(TokenKind::CloseSquare) {
                         return Err(ParseError::new_error_str_at_pos(
                             source, iter.last_valid_pos(),
                             "unexpected token: expected ']'"
                         ));
+                    }
                     let (_, end_pos) = iter.next_positions();
                     let array_span = InputSpan::from_positions(start_pos, end_pos);
                     insert_array_before(&mut elements, angle_depth, array_span);
                 } else {
                     return Err(ParseError::new_error_str_at_pos(
                         source, iter.last_valid_pos(),
                         "unexpected token: expected ',', '>', or '['")
                     );
+                }
                 iter.consume();
             },
             State::Comma => {
                 // Just parsed a comma, expecting an identifier or more closing
                 // braces
                 if Some(TokenKind::Ident) == next {
                     let element = consume_parser_type_ident(source, iter, symbols, heap, poly_vars, cur_scope, wrapping_definition, allow_inference)?;
                     elements.push(Entry{ element, depth: angle_depth });
                     state = State::Ident;
                 } else if Some(TokenKind::CloseAngle) == next {
                     iter.consume();
                     angle_depth -= 1;
                     state = State::Close;
                 } else if Some(TokenKind::ShiftRight) == next {
                     iter.consume();
                     angle_depth -= 2;
                     state = State::Close;
                 } else {
                     return Err(ParseError::new_error_str_at_pos(
                         source, iter.last_valid_pos(),
                         "unexpected token: expected '>' or a type name"
                     ));
+                }
+            }
+        }
         if angle_depth < 0 {
             return Err(ParseError::new_error_str_at_pos(source, iter.last_valid_pos(), "unmatched '>'"));
         } else if angle_depth == 0 {
             break;
+        }
+    }
     // If here then we found the correct number of angle braces. But we still
     // need to make sure that each encountered type has the correct number of
     // embedded types.
     let mut idx = 0;
     while idx < elements.len() {
         let cur_element = &elements[idx];
         let expected_subtypes = cur_element.element.variant.num_embedded();
         let mut encountered_subtypes = 0;
         for peek_idx in idx + 1..elements.len() {
             let peek_element = &elements[peek_idx];
             if peek_element.depth == cur_element.depth + 1 {
                 encountered_subtypes += 1;
             } else if peek_element.depth <= cur_element.depth {
                 break;
+            }
+        }
         if expected_subtypes != encountered_subtypes {
             if encountered_subtypes == 0 {
                 // Case where we have elided the embedded types, all of them
                 // should be inferred.
                 if !allow_inference {
                     return Err(ParseError::new_error_str_at_span(
                         source, cur_element.element.full_span,
                         "type inference is not allowed here"
                     ));
+                }
                 // Insert the missing types
                 let inserted_span = cur_element.element.full_span;
                 let inserted_depth = cur_element.depth + 1;
                 elements.reserve(expected_subtypes);
                 for _ in 0..expected_subtypes {
                     elements.insert(idx + 1, Entry{
                         element: ParserTypeElement{ full_span: inserted_span, variant: ParserTypeVariant::Inferred },
                         depth: inserted_depth,
                     });
+                }
             } else {
                 // Mismatch in number of embedded types
                 let expected_args_text = if expected_subtypes == 1 {
                     "polymorphic argument"
                 } else {
                     "polymorphic arguments"
                 };
                 // Mismatch in number of embedded types, produce a neat error
                 // message.
                 let type_name = String::from_utf8_lossy(source.section_at_span(cur_element.element.full_span));
                 fn polymorphic_name_text(num: usize) -> &'static str {
                     if num == 1 { "polymorphic argument" } else { "polymorphic arguments" }
+                }
                 fn were_or_was(num: usize) -> &'static str {
                     if num == 1 { "was" } else { "were" }
+                }
                 if expected_subtypes == 0 {
                     return Err(ParseError::new_error_at_span(
                         source, cur_element.element.full_span,
                         format!(
                             "the type '{}' is not polymorphic, yet {} {} {} provided",
                             type_name, encountered_subtypes, polymorphic_name_text(encountered_subtypes),
                             were_or_was(encountered_subtypes)
+                        )
                     ));
+                }
                 let maybe_infer_text = if allow_inference {
                     " (or none, to perform implicit type inference)"
                 } else {
                     ""
                 };
                 return Err(ParseError::new_error_at_span(
                     source, cur_element.element.full_span,
                     format!(
                         "expected {} {}{}, but {} were provided",
                         expected_subtypes, expected_args_text, maybe_infer_text, encountered_subtypes
                         "expected {} {}{} for the type '{}', but {} {} provided",
                         expected_subtypes, polymorphic_name_text(expected_subtypes),
                         maybe_infer_text, type_name, encountered_subtypes,
                         were_or_was(encountered_subtypes)
+                    )
                 ));
+            }
+        }
         idx += 1;
+    }
     let mut constructed_elements = Vec::with_capacity(elements.len());
     for element in elements.into_iter() {
         constructed_elements.push(element.element);
+    }
     Ok(ParserType{ elements: constructed_elements })
+}
 /// Consumes an identifier for which we assume that it resolves to some kind of
 /// type. Once we actually arrive at a type we will stop parsing. Hence there
 /// may be trailing '::' tokens in the iterator.
 fn consume_parser_type_ident(
     source: &InputSource, iter: &mut TokenIter, symbols: &SymbolTable, heap: &Heap, poly_vars: &[Identifier],
     mut scope: SymbolScope, wrapping_definition: DefinitionId, allow_inference: bool,
 ) -> Result<ParserTypeElement, ParseError> {
     use ParserTypeVariant as PTV;
     let (mut type_text, mut type_span) = consume_any_ident(source, iter)?;
     let variant = match type_text {
         KW_TYPE_MESSAGE => PTV::Message,
         KW_TYPE_BOOL => PTV::Bool,
         KW_TYPE_UINT8 => PTV::UInt8,
         KW_TYPE_UINT16 => PTV::UInt16,
         KW_TYPE_UINT32 => PTV::UInt32,
         KW_TYPE_UINT64 => PTV::UInt64,
         KW_TYPE_SINT8 => PTV::SInt8,
         KW_TYPE_SINT16 => PTV::SInt16,
         KW_TYPE_SINT32 => PTV::SInt32,
         KW_TYPE_SINT64 => PTV::SInt64,
         KW_TYPE_IN_PORT => PTV::Input,
         KW_TYPE_OUT_PORT => PTV::Output,
         KW_TYPE_CHAR => PTV::Character,
         KW_TYPE_STRING => PTV::String,
         KW_TYPE_INFERRED => {
             if !allow_inference {
                 return Err(ParseError::new_error_str_at_span(source, type_span, "type inference is not allowed here"));
+            }
             PTV::Inferred
         },
         _ => {
             // Must be some kind of symbolic type
             let mut type_kind = None;
             for (poly_idx, poly_var) in poly_vars.iter().enumerate() {
                 if poly_var.value.as_bytes() == type_text {
                     type_kind = Some(PTV::PolymorphicArgument(wrapping_definition, poly_idx));
+                }
+            }
             if type_kind.is_none() {
                 // Check symbol table for definition. To be fair, the language
                 // only allows a single namespace for now. That said:
                 let last_symbol = symbols.get_symbol_by_name(scope, type_text);
                 if last_symbol.is_none() {
                     return Err(ParseError::new_error_str_at_span(source, type_span, "unknown type"));
+                }
                 let mut last_symbol = last_symbol.unwrap();
                 loop {
                     match &last_symbol.variant {
                         SymbolVariant::Module(symbol_module) => {
                             // Expecting more identifiers
                             if Some(TokenKind::ColonColon) != iter.next() {
                                 return Err(ParseError::new_error_str_at_span(source, type_span, "expected type but got module"));
+                                return Err(ParseError::new_error_str_at_span(source, type_span, "expected a type but got a module"));
+                            }
                             consume_token(source, iter, TokenKind::ColonColon)?;
                             // Consume next part of type and prepare for next
                             // lookup loop
                             let (next_text, next_span) = consume_any_ident(source, iter)?;
                             let old_text = type_text;
                             type_text = next_text;
                             type_span.end = next_span.end;
                             scope = SymbolScope::Module(symbol_module.root_id);
                             let new_symbol = symbols.get_symbol_by_name_defined_in_scope(scope, type_text);
                             if new_symbol.is_none() {
                                 return Err(ParseError::new_error_at_span(
                                     source, next_span,
                                 // If the type is imported in the module then notify the programmer
                                 // that imports do not leak outside of a module
                                 let type_name = String::from_utf8_lossy(type_text);
                                 let module_name = String::from_utf8_lossy(old_text);
                                 let suffix = if symbols.get_symbol_by_name(scope, type_text).is_some() {
                                     format!(
                                         "unknown type '{}' in module '{}'",
                                         String::from_utf8_lossy(type_text),
                                         String::from_utf8_lossy(old_text)
                                         ". The module '{}' does import '{}', but these imports are not visible to other modules",
                                         &module_name, &type_name
+                                    )
                                 } else {
                                     String::new()
                                 };
                                 return Err(ParseError::new_error_at_span(
                                     source, next_span,
                                     format!("unknown type '{}' in module '{}'{}", type_name, module_name, suffix)
                                 ));
+                            }
                             last_symbol = new_symbol.unwrap();
                         },
                         SymbolVariant::Definition(symbol_definition) => {
                             let num_poly_vars = heap[symbol_definition.definition_id].poly_vars().len();
                             type_kind = Some(PTV::Definition(symbol_definition.definition_id, num_poly_vars));
                             break;
+                        }
+                    }
+                }
+            }
             debug_assert!(type_kind.is_some());
             type_kind.unwrap()
         },
     };
     Ok(ParserTypeElement{ full_span: type_span, variant })
+}
 /// Consumes polymorphic variables and throws them on the floor.
 fn consume_polymorphic_vars_spilled(source: &InputSource, iter: &mut TokenIter, _ctx: &mut PassCtx) -> Result<(), ParseError> {
     maybe_consume_comma_separated_spilled(
         TokenKind::OpenAngle, TokenKind::CloseAngle, source, iter, _ctx,
         |source, iter, _ctx| {
             consume_ident(source, iter)?;
             Ok(())
         }, "a polymorphic variable"
     )?;
     Ok(())
+}
 /// Consumes the parameter list to functions/components
 fn consume_parameter_list(
     source: &InputSource, iter: &mut TokenIter, ctx: &mut PassCtx,
     target: &mut ScopedSection<ParameterId>, scope: SymbolScope, definition_id: DefinitionId
 ) -> Result<(), ParseError> {
     consume_comma_separated(
         TokenKind::OpenParen, TokenKind::CloseParen, source, iter, ctx,
         |source, iter, ctx| {
             let poly_vars = ctx.heap[definition_id].poly_vars(); // TODO: @Cleanup, this is really ugly. But rust...
             let (start_pos, _) = iter.next_positions();
             let parser_type = consume_parser_type(
                 source, iter, &ctx.symbols, &ctx.heap, poly_vars, scope,
                 definition_id, false, 0
             )?;
             let identifier = consume_ident_interned(source, iter, ctx)?;
             let parameter_id = ctx.heap.alloc_parameter(|this| Parameter{
                 this,
                 span: InputSpan::from_positions(start_pos, identifier.span.end),
                 parser_type,
                 identifier
             });
             Ok(parameter_id)
         },
         target, "a parameter", "a parameter list", None
+    )
+}
@@ \ No newline at end of file @@

src/protocol/parser/pass_imports.rs

➞

Show inline comments

 use crate::protocol::ast::*;
 use super::symbol_table::*;
 use super::{Module, ModuleCompilationPhase, PassCtx};
 use super::tokens::*;
 use super::token_parsing::*;
 use crate::protocol::input_source::{InputSource as InputSource, InputSpan, ParseError};
 use crate::collections::*;
 /// Parses all the imports in the module tokens. Is applied after the
 /// definitions and name of modules are resolved. Hence we should be able to
 /// resolve all symbols to their appropriate module/definition.
 pub(crate) struct PassImport {
     imports: Vec<ImportId>,
     found_symbols: Vec<(AliasedSymbol, SymbolDefinition)>,
     scoped_symbols: Vec<Symbol>,
+}
 impl PassImport {
     pub(crate) fn new() -> Self {
         Self{
             imports: Vec::with_capacity(32),
             found_symbols: Vec::with_capacity(32),
             scoped_symbols: Vec::with_capacity(32),
+        }
+    }
     pub(crate) fn parse(&mut self, modules: &mut [Module], module_idx: usize, ctx: &mut PassCtx) -> Result<(), ParseError> {
         let module = &modules[module_idx];
         let module_range = &module.tokens.ranges[0];
         debug_assert!(modules.iter().all(|m| m.phase >= ModuleCompilationPhase::SymbolsScanned));
         debug_assert_eq!(module.phase, ModuleCompilationPhase::SymbolsScanned);
         debug_assert_eq!(module_range.range_kind, TokenRangeKind::Module);
         let mut range_idx = module_range.first_child_idx;
         loop {
             let range_idx_usize = range_idx as usize;
             let cur_range = &module.tokens.ranges[range_idx_usize];
             if cur_range.range_kind == TokenRangeKind::Import {
                 self.visit_import_range(modules, module_idx, ctx, range_idx_usize)?;
+            }
             if cur_range.next_sibling_idx == NO_SIBLING {
                 break;
             } else {
                 range_idx = cur_range.next_sibling_idx;
+            }
+        }
         let root = &mut ctx.heap[module.root_id];
         root.imports.extend(self.imports.drain(..));
         let module = &mut modules[module_idx];
         module.phase = ModuleCompilationPhase::ImportsResolved;
         Ok(())
+    }
     pub(crate) fn visit_import_range(
         &mut self, modules: &[Module], module_idx: usize, ctx: &mut PassCtx, range_idx: usize
     ) -> Result<(), ParseError> {
         let module = &modules[module_idx];
         let import_range = &module.tokens.ranges[range_idx];
         debug_assert_eq!(import_range.range_kind, TokenRangeKind::Import);
         let mut iter = module.tokens.iter_range(import_range);
         // Consume "import"
         let (_import_ident, import_span) =
             consume_any_ident(&module.source, &mut iter)?;
         debug_assert_eq!(_import_ident, KW_IMPORT);
         // Consume module name
         let (module_name, module_name_span) = consume_domain_ident(&module.source, &mut iter)?;
         let target_root_id = ctx.symbols.get_module_by_name(module_name);
         if target_root_id.is_none() {
             return Err(ParseError::new_error_at_span(
                 &module.source, module_name_span,
                 format!("could not resolve module '{}'", String::from_utf8_lossy(module_name))
             ));
+        }
         let module_name = ctx.pool.intern(module_name);
         let module_identifier = Identifier{ span: module_name_span, value: module_name };
         let target_root_id = target_root_id.unwrap();
         // Check for subsequent characters (alias, multiple imported symbols)
         let next = iter.next();
         let import_id;
         if has_ident(&module.source, &mut iter, b"as") {
             // Alias for module
             iter.consume();
             let alias_identifier = consume_ident_interned(&module.source, &mut iter, ctx)?;
             let alias_name = alias_identifier.value.clone();
             import_id = ctx.heap.alloc_import(|this| Import::Module(ImportModule{
                 this,
                 span: import_span,
                 module: module_identifier,
                 alias: alias_identifier,
                 module_id: target_root_id
             }));
             if let Err((new_symbol, old_symbol)) = ctx.symbols.insert_symbol(SymbolScope::Module(module.root_id), Symbol{
                 name: alias_name,
                 variant: SymbolVariant::Module(SymbolModule{
                     root_id: target_root_id,
                     introduced_at: import_id,
                 }),
             }) {
                 return Err(construct_symbol_conflict_error(modules, module_idx, ctx, &new_symbol, &old_symbol));
+            }
         } else if Some(TokenKind::ColonColon) == next {
             iter.consume();
             // Helper function to consume symbols, their alias, and the
             // definition the symbol is pointing to.
             fn consume_symbol_and_maybe_alias<'a>(
                 source: &'a InputSource, iter: &mut TokenIter, ctx: &mut PassCtx,
                 module_name: &StringRef<'static>, module_root_id: RootId,
             ) -> Result<(AliasedSymbol, SymbolDefinition), ParseError> {
                 // Consume symbol name and make sure it points to an existing definition
                 let symbol_identifier = consume_ident_interned(source, iter, ctx)?;
                 // Consume alias text if specified
                 let alias_identifier = if peek_ident(source, iter) == Some(b"as") {
                     // Consume alias
                     iter.consume();
                     Some(consume_ident_interned(source, iter, ctx)?)
                 } else {
                     None
                 };
                 let target = ctx.symbols.get_symbol_by_name_defined_in_scope(
                     SymbolScope::Module(module_root_id), symbol_identifier.value.as_bytes()
                 );
                 if target.is_none() {
                     return Err(ParseError::new_error_at_span(
                         source, symbol_identifier.span,
                         format!(
                             "could not find symbol '{}' within module '{}'",
                             symbol_identifier.value.as_str(), module_name.as_str()
+                        )
                     ));
+                }
                 let target = target.unwrap();
                 debug_assert_ne!(target.class(), SymbolClass::Module);
                 let target_definition = target.variant.as_definition();
                 Ok((
                     AliasedSymbol{
                         name: symbol_identifier,
                         alias: alias_identifier,
                         definition_id: target_definition.definition_id,
                     },
                     target_definition.clone()
                 ))
+            }
             let next = iter.next();
             if Some(TokenKind::Ident) == next {
                 // Importing a single symbol
                 iter.consume();
                 let (imported_symbol, symbol_definition) = consume_symbol_and_maybe_alias(
                     &module.source, &mut iter, ctx, &module_identifier.value, target_root_id
                 )?;
                 let alias_identifier = match imported_symbol.alias.as_ref() {
                     Some(alias) => alias.clone(),
                     None => imported_symbol.name.clone(),
                 };
                 import_id = ctx.heap.alloc_import(|this| Import::Symbols(ImportSymbols{
                     this,
                     span: InputSpan::from_positions(import_span.begin, alias_identifier.span.end),
                     module: module_identifier,
                     module_id: target_root_id,
                     symbols: vec![imported_symbol],
                 }));
                 if let Err((new_symbol, old_symbol)) = ctx.symbols.insert_symbol(
                     SymbolScope::Module(module.root_id),
                     Symbol{
                         name: alias_identifier.value,
                         variant: SymbolVariant::Definition(symbol_definition.into_imported(import_id))
+                    }
                 ) {
                     return Err(construct_symbol_conflict_error(
                         modules, module_idx, ctx, &new_symbol, &old_symbol
                     ));
+                }
             } else if Some(TokenKind::OpenCurly) == next {
                 // Importing multiple symbols
                 let mut end_of_list = iter.last_valid_pos();
                 consume_comma_separated(
                     TokenKind::OpenCurly, TokenKind::CloseCurly, &module.source, &mut iter, ctx,
                     |source, iter, ctx| consume_symbol_and_maybe_alias(
                         source, iter, ctx, &module_identifier.value, target_root_id
                     ),
                     &mut self.found_symbols, "a symbol", "a list of symbols to import", Some(&mut end_of_list)
                 )?;
                 // Preallocate import
                 import_id = ctx.heap.alloc_import(|this| Import::Symbols(ImportSymbols {
                     this,
                     span: InputSpan::from_positions(import_span.begin, end_of_list),
                     module: module_identifier,
                     module_id: target_root_id,
                     symbols: Vec::with_capacity(self.found_symbols.len()),
                 }));
                 // Fill import symbols while inserting symbols in the
                 // appropriate scope in the symbol table.
                 let import = ctx.heap[import_id].as_symbols_mut();
                 for (imported_symbol, symbol_definition) in self.found_symbols.drain(..) {
                     let import_name = match imported_symbol.alias.as_ref() {
                         Some(import) => import.value.clone(),
                         None => imported_symbol.name.value.clone()
                     };
                     import.symbols.push(imported_symbol);
                     if let Err((new_symbol, old_symbol)) = ctx.symbols.insert_symbol(
                         SymbolScope::Module(module.root_id), Symbol{
                             name: import_name,
                             variant: SymbolVariant::Definition(symbol_definition.into_imported(import_id))
+                        }
                     ) {
                         return Err(construct_symbol_conflict_error(modules, module_idx, ctx, &new_symbol, &old_symbol));
+                    }
+                }
             } else if Some(TokenKind::Star) == next {
                 // Import all symbols from the module
                 let star_span = iter.next_span();
                 iter.consume();
                 self.scoped_symbols.clear();
                 let _found = ctx.symbols.get_all_symbols_defined_in_scope(
                     SymbolScope::Module(target_root_id),
                     &mut self.scoped_symbols
                 );
                 debug_assert!(_found); // even modules without symbols should have a scope
                 // Preallocate import
                 import_id = ctx.heap.alloc_import(|this| Import::Symbols(ImportSymbols{
                     this,
                     span: InputSpan::from_positions(import_span.begin, star_span.end),
                     module: module_identifier,
                     module_id: target_root_id,
                     symbols: Vec::with_capacity(self.scoped_symbols.len())
                 }));
                 // Fill import AST node and symbol table
                 let import = ctx.heap[import_id].as_symbols_mut();
                 for symbol in self.scoped_symbols.drain(..) {
                     let symbol_name = symbol.name;
                     match symbol.variant {
                         SymbolVariant::Definition(symbol_definition) => {
                             import.symbols.push(AliasedSymbol{
                                 name: Identifier{ span: star_span, value: symbol_name.clone() },
                                 alias: None,
                                 definition_id: symbol_definition.definition_id,
                             });
                             if let Err((new_symbol, old_symbol)) = ctx.symbols.insert_symbol(
                                 SymbolScope::Module(module.root_id),
                                 Symbol{
                                     name: symbol_name,
                                     variant: SymbolVariant::Definition(symbol_definition.into_imported(import_id))
+                                }
                             ) {
                                 return Err(construct_symbol_conflict_error(modules, module_idx, ctx, &new_symbol, &old_symbol));
+                            }
                         },
                         _ => unreachable!(),
+                    }
+                }
             } else {
                 return Err(ParseError::new_error_str_at_pos(
                     &module.source, iter.last_valid_pos(), "expected symbol name, '{' or '*'"
                 ));
+            }
         } else {
             // Assume implicit alias
             let module_name_str = module_identifier.value.clone();
             let last_ident_start = module_name_str.as_str().rfind('.').map_or(0, |v| v + 1);
             let alias_text = &module_name_str.as_bytes()[last_ident_start..];
             let alias = ctx.pool.intern(alias_text);
             let alias_span = InputSpan::from_positions(
                 module_name_span.begin.with_offset(last_ident_start as u32),
                 module_name_span.end
             );
             let alias_identifier = Identifier{ span: alias_span, value: alias.clone() };
             import_id = ctx.heap.alloc_import(|this| Import::Module(ImportModule{
                 this,
                 span: InputSpan::from_positions(import_span.begin, module_identifier.span.end),
                 module: module_identifier,
                 alias: alias_identifier,
                 module_id: target_root_id,
             }));
             if let Err((new_symbol, old_symbol)) = ctx.symbols.insert_symbol(SymbolScope::Module(module.root_id), Symbol{
                 name: alias,
                 variant: SymbolVariant::Module(SymbolModule{
                     root_id: target_root_id,
                     introduced_at: import_id
                 })
             }) {
                 return Err(construct_symbol_conflict_error(modules, module_idx, ctx, &new_symbol, &old_symbol));
+            }
+        }
         // By now the `import_id` is set, just need to make sure that the import
         // properly ends with a semicolon
         consume_token(&module.source, &mut iter, TokenKind::SemiColon)?;
         self.imports.push(import_id);
         Ok(())
+    }
+}

src/protocol/parser/pass_tokenizer.rs

➞

Show inline comments

 use crate::protocol::input_source::{
     InputSource as InputSource,
     ParseError,
     InputPosition as InputPosition,
 };
 use super::tokens::*;
 use super::token_parsing::*;
 /// Tokenizer is a reusable parser to tokenize multiple source files using the
 /// same allocated buffers. In a well-formed program, we produce a consistent
 /// tree of token ranges such that we may identify tokens that represent a
 /// defintion or an import before producing the entire AST.
 ///
 /// If the program is not well-formed then the tree may be inconsistent, but we
 /// will detect this once we transform the tokens into the AST. To ensure a
 /// consistent AST-producing phase we will require the import to have balanced
 /// curly braces
 pub(crate) struct PassTokenizer {
     // Stack of input positions of opening curly braces, used to detect
     // unmatched opening braces, unmatched closing braces are detected
     // immediately.
     curly_stack: Vec<InputPosition>,
     // Points to an element in the `TokenBuffer.ranges` variable.
     stack_idx: usize,
+}
 impl PassTokenizer {
     pub(crate) fn new() -> Self {
         Self{
             curly_stack: Vec::with_capacity(32),
             stack_idx: 0
+        }
+    }
     pub(crate) fn tokenize(&mut self, source: &mut InputSource, target: &mut TokenBuffer) -> Result<(), ParseError> {
         // Assert source and buffer are at start
         debug_assert_eq!(source.pos().offset, 0);
         debug_assert!(target.tokens.is_empty());
         debug_assert!(target.ranges.is_empty());
         // Set up for tokenization by pushing the first range onto the stack.
         // This range may get transformed into the appropriate range kind later,
         // see `push_range` and `pop_range`.
         self.stack_idx = 0;
         target.ranges.push(TokenRange{
             parent_idx: NO_RELATION,
             range_kind: TokenRangeKind::Module,
             curly_depth: 0,
             start: 0,
             end: 0,
             num_child_ranges: 0,
             first_child_idx: NO_RELATION,
             last_child_idx: NO_RELATION,
             next_sibling_idx: NO_RELATION,
         });
         // Main tokenization loop
         while let Some(c) = source.next() {
             let token_index = target.tokens.len() as u32;
             if is_char_literal_start(c) {
                 self.consume_char_literal(source, target)?;
             } else if is_string_literal_start(c) {
                 self.consume_string_literal(source, target)?;
             } else if is_identifier_start(c) {
                 let ident = self.consume_identifier(source, target)?;
                 if demarks_definition(ident) {
                     self.push_range(target, TokenRangeKind::Definition, token_index);
                 } else if demarks_import(ident) {
                     self.push_range(target, TokenRangeKind::Import, token_index);
+                }
             } else if is_integer_literal_start(c) {
                 self.consume_number(source, target)?;
             } else if is_pragma_start_or_pound(c) {
                 let was_pragma = self.consume_pragma_or_pound(c, source, target)?;
                 if was_pragma {
                     self.push_range(target, TokenRangeKind::Pragma, token_index);
+                }
             } else if self.is_line_comment_start(c, source) {
                 self.consume_line_comment(source, target)?;
             } else if self.is_block_comment_start(c, source) {
                 self.consume_block_comment(source, target)?;
             } else if is_whitespace(c) {
                 let contained_newline = self.consume_whitespace(source);
                 if contained_newline {
                     let range = &target.ranges[self.stack_idx];
                     if range.range_kind == TokenRangeKind::Pragma {
                         self.pop_range(target, target.tokens.len() as u32);
+                    }
+                }
             } else {
                 let was_punctuation = self.maybe_parse_punctuation(c, source, target)?;
                 if let Some((token, token_pos)) = was_punctuation {
                     if token == TokenKind::OpenCurly {
                         self.curly_stack.push(token_pos);
                     } else if token == TokenKind::CloseCurly {
                         // Check if this marks the end of a range we're
                         // currently processing
                         if self.curly_stack.is_empty() {
                             return Err(ParseError::new_error_str_at_pos(
                                 source, token_pos, "unmatched closing curly brace '}'"
                             ));
+                        }
                         self.curly_stack.pop();
                         let range = &target.ranges[self.stack_idx];
                         if range.range_kind == TokenRangeKind::Definition && range.curly_depth == self.curly_stack.len() as u32 {
                             self.pop_range(target, target.tokens.len() as u32);
+                        }
                         // Exit early if we have more closing curly braces than
                         // opening curly braces
                     } else if token == TokenKind::SemiColon {
                         // Check if this marks the end of an import
                         let range = &target.ranges[self.stack_idx];
                         if range.range_kind == TokenRangeKind::Import {
                             self.pop_range(target, target.tokens.len() as u32);
+                        }
+                    }
                 } else {
                     return Err(ParseError::new_error_str_at_pos(
                         source, source.pos(), "unexpected character"
                     ));
+                }
+            }
+        }
         // End of file, check if our state is correct
         if let Some(error) = source.had_error.take() {
             return Err(error);
+        }
         if !self.curly_stack.is_empty() {
             // Let's not add a lot of heuristics and just tell the programmer
             // that something is wrong
             let last_unmatched_open = self.curly_stack.pop().unwrap();
             return Err(ParseError::new_error_str_at_pos(
                 source, last_unmatched_open, "unmatched opening curly brace '{'"
             ));
+        }
         // Ranges that did not depend on curly braces may have missing tokens.
         // So close all of the active tokens
         while self.stack_idx != 0 {
             self.pop_range(target, target.tokens.len() as u32);
+        }
         // And finally, we may have a token range at the end that doesn't belong
         // to a range yet, so insert a "code" range if this is the case.
         debug_assert_eq!(self.stack_idx, 0);
         let last_registered_idx = target.ranges[0].end;
         let last_token_idx = target.tokens.len() as u32;
         if last_registered_idx != last_token_idx {
             self.add_code_range(target, 0, last_registered_idx, last_token_idx);
+            self.add_code_range(target, 0, last_registered_idx, last_token_idx, NO_RELATION);
+        }
         // TODO: @remove once I'm sure the algorithm works. For now it is better
         //  if the debugging is a little more expedient
         if cfg!(debug_assertions) {
             // For each range make sure its children make sense
             for parent_idx in 0..target.ranges.len() {
                 let cur_range = &target.ranges[parent_idx];
                 if cur_range.num_child_ranges == 0 {
                     assert_eq!(cur_range.first_child_idx, NO_RELATION);
                     assert_eq!(cur_range.last_child_idx, NO_RELATION);
                 } else {
                     assert_ne!(cur_range.first_child_idx, NO_RELATION);
                     assert_ne!(cur_range.last_child_idx, NO_RELATION);
                     let mut child_counter = 0u32;
                     let mut last_valid_child_idx = cur_range.first_child_idx;
                     let mut child_idx = cur_range.first_child_idx;
                     while child_idx != NO_RELATION {
                         let child_range = &target.ranges[child_idx as usize];
                         assert_eq!(child_range.parent_idx, parent_idx as i32);
                         last_valid_child_idx = child_idx;
                         child_idx = child_range.next_sibling_idx;
                         child_counter += 1;
+                    }
                     assert_eq!(cur_range.last_child_idx, last_valid_child_idx);
                     assert_eq!(cur_range.num_child_ranges, child_counter);
+                }
+            }
+        }
         Ok(())
+    }
     fn is_line_comment_start(&self, first_char: u8, source: &InputSource) -> bool {
         return first_char == b'/' && Some(b'/') == source.lookahead(1);
+    }
     fn is_block_comment_start(&self, first_char: u8, source: &InputSource) -> bool {
         return first_char == b'/' && Some(b'*') == source.lookahead(1);
+    }
     fn maybe_parse_punctuation(
         &mut self, first_char: u8, source: &mut InputSource, target: &mut TokenBuffer
     ) -> Result<Option<(TokenKind, InputPosition)>, ParseError> {
         debug_assert!(first_char != b'#', "'#' needs special handling");
         debug_assert!(first_char != b'\'', "'\'' needs special handling");
         debug_assert!(first_char != b'"', "'\"' needs special handling");
         let pos = source.pos();
         let token_kind;
         if first_char == b'!' {
             source.consume();
             if Some(b'=') == source.next() {
                 source.consume();
                 token_kind = TokenKind::NotEqual;
             } else {
                 token_kind = TokenKind::Exclamation;
+            }
         } else if first_char == b'%' {
             source.consume();
             if Some(b'=') == source.next() {
                 source.consume();
                 token_kind = TokenKind::PercentEquals;
             } else {
                 token_kind = TokenKind::Percent;
+            }
         } else if first_char == b'&' {
             source.consume();
             let next = source.next();
             if Some(b'&') == next {
                 source.consume();
                 token_kind = TokenKind::AndAnd;
             } else if Some(b'=') == next {
                 source.consume();
                 token_kind = TokenKind::AndEquals;
             } else {
                 token_kind = TokenKind::And;
+            }
         } else if first_char == b'(' {
             source.consume();
             token_kind = TokenKind::OpenParen;
         } else if first_char == b')' {
             source.consume();
             token_kind = TokenKind::CloseParen;
         } else if first_char == b'*' {
             source.consume();
             if let Some(b'=') = source.next() {
                 source.consume();
                 token_kind = TokenKind::StarEquals;
             } else {
                 token_kind = TokenKind::Star;
+            }
         } else if first_char == b'+' {
             source.consume();
             let next = source.next();
             if Some(b'+') == next {
                 source.consume();
                 token_kind = TokenKind::PlusPlus;
             } else if Some(b'=') == next {
                 source.consume();
                 token_kind = TokenKind::PlusEquals;
             } else {
                 token_kind = TokenKind::Plus;
+            }
         } else if first_char == b',' {
             source.consume();
             token_kind = TokenKind::Comma;
         } else if first_char == b'-' {
             source.consume();
             let next = source.next();
             if Some(b'-') == next {
                 source.consume();
                 token_kind = TokenKind::MinusMinus;
             } else if Some(b'>') == next {
                 source.consume();
                 token_kind = TokenKind::ArrowRight;
             } else if Some(b'=') == next {
                 source.consume();
                 token_kind = TokenKind::MinusEquals;
             } else {
                 token_kind = TokenKind::Minus;
+            }
         } else if first_char == b'.' {
             source.consume();
             if let Some(b'.') = source.next() {
                 source.consume();
                 token_kind = TokenKind::DotDot;
             } else {
                 token_kind = TokenKind::Dot
+            }
         } else if first_char == b'/' {
             source.consume();
             debug_assert_ne!(Some(b'/'), source.next());
             debug_assert_ne!(Some(b'*'), source.next());
             if let Some(b'=') = source.next() {
                 source.consume();
                 token_kind = TokenKind::SlashEquals;
             } else {
                 token_kind = TokenKind::Slash;
+            }
         } else if first_char == b':' {
             source.consume();
             if let Some(b':') = source.next() {
                 source.consume();
                 token_kind = TokenKind::ColonColon;
             } else {
                 token_kind = TokenKind::Colon;
+            }
         } else if first_char == b';' {
             source.consume();
             token_kind = TokenKind::SemiColon;
         } else if first_char == b'<' {
             source.consume();
             let next = source.next();
             if let Some(b'<') = next {
                 source.consume();
                 if let Some(b'=') = source.next() {
                     source.consume();
                     token_kind = TokenKind::ShiftLeftEquals;
                 } else {
                     token_kind = TokenKind::ShiftLeft;
+                }
             } else if let Some(b'=') = next {
                 source.consume();
                 token_kind = TokenKind::LessEquals;
             } else {
                 token_kind = TokenKind::OpenAngle;
+            }
         } else if first_char == b'=' {
             source.consume();
             if let Some(b'=') = source.next() {
                 source.consume();
                 token_kind = TokenKind::EqualEqual;
             } else {
                 token_kind = TokenKind::Equal;
+            }
         } else if first_char == b'>' {
             source.consume();
             let next = source.next();
             if Some(b'>') == next {
                 source.consume();
                 if Some(b'=') == source.next() {
                     source.consume();
                     token_kind = TokenKind::ShiftRightEquals;
                 } else {
                     token_kind = TokenKind::ShiftRight;
+                }
             } else if Some(b'=') == next {
                 source.consume();
                 token_kind = TokenKind::GreaterEquals;
             } else {
                 token_kind = TokenKind::CloseAngle;
+            }
         } else if first_char == b'?' {
             source.consume();
             token_kind = TokenKind::Question;
         } else if first_char == b'@' {
             source.consume();
             token_kind = TokenKind::At;
         } else if first_char == b'[' {
             source.consume();
             token_kind = TokenKind::OpenSquare;
         } else if first_char == b']' {
             source.consume();
             token_kind = TokenKind::CloseSquare;
         } else if first_char == b'^' {
             source.consume();
             if let Some(b'=') = source.next() {
                 source.consume();
                 token_kind = TokenKind::CaretEquals;
             } else {
                 token_kind = TokenKind::Caret;
+            }
         } else if first_char == b'{' {
             source.consume();
             token_kind = TokenKind::OpenCurly;
         } else if first_char == b'|' {
             source.consume();
             let next = source.next();
             if Some(b'|') == next {
                 source.consume();
                 token_kind = TokenKind::OrOr;
             } else if Some(b'=') == next {
                 source.consume();
                 token_kind = TokenKind::OrEquals;
             } else {
                 token_kind = TokenKind::Or;
+            }
         } else if first_char == b'}' {
             source.consume();
             token_kind = TokenKind::CloseCurly;
         } else if first_char == b'~' {
             source.consume();
             token_kind = TokenKind::Tilde;
         } else {
             self.check_ascii(source)?;
             return Ok(None);
+        }
         target.tokens.push(Token::new(token_kind, pos));
         Ok(Some((token_kind, pos)))
+    }
     fn consume_char_literal(&mut self, source: &mut InputSource, target: &mut TokenBuffer) -> Result<(), ParseError> {
         let begin_pos = source.pos();
         // Consume the leading quote
         debug_assert!(source.next().unwrap() == b'\'');
         source.consume();
         let mut prev_char = b'\'';
         while let Some(c) = source.next() {
             if !c.is_ascii() {
                 return Err(ParseError::new_error_str_at_pos(source, source.pos(), "non-ASCII character in char literal"));
+            }
             source.consume();
             // Make sure ending quote was not escaped
             if c == b'\'' && prev_char != b'\\' {
                 prev_char = c;
                 break;
+            }
             prev_char = c;
+        }
         if prev_char != b'\'' {
             // Unterminated character literal, reached end of file.
             return Err(ParseError::new_error_str_at_pos(source, begin_pos, "encountered unterminated character literal"));
+        }
         let end_pos = source.pos();
         target.tokens.push(Token::new(TokenKind::Character, begin_pos));
         target.tokens.push(Token::new(TokenKind::SpanEnd, end_pos));
         Ok(())
+    }
     fn consume_string_literal(&mut self, source: &mut InputSource, target: &mut TokenBuffer) -> Result<(), ParseError> {
         let begin_pos = source.pos();
         // Consume the leading double quotes
         debug_assert!(source.next().unwrap() == b'"');
         source.consume();
         let mut prev_char = b'"';
         while let Some(c) = source.next() {
             if !c.is_ascii() {
                 return Err(ParseError::new_error_str_at_pos(source, source.pos(), "non-ASCII character in string literal"));
+            }
             source.consume();
             if c == b'"' && prev_char != b'\\' {
                 prev_char = c;
                 break;
+            }
             prev_char = c;
+        }
         if prev_char != b'"' {
             // Unterminated string literal
             return Err(ParseError::new_error_str_at_pos(source, begin_pos, "encountered unterminated string literal"));
+        }
         let end_pos = source.pos();
         target.tokens.push(Token::new(TokenKind::String, begin_pos));
         target.tokens.push(Token::new(TokenKind::SpanEnd, end_pos));
         Ok(())
+    }
     fn consume_pragma_or_pound(&mut self, first_char: u8, source: &mut InputSource, target: &mut TokenBuffer) -> Result<bool, ParseError> {
         let start_pos = source.pos();
         debug_assert_eq!(first_char, b'#');
         source.consume();
         let next = source.next();
         if next.is_none() || !is_identifier_start(next.unwrap()) {
             // Just a pound sign
             target.tokens.push(Token::new(TokenKind::Pound, start_pos));
             Ok(false)
         } else {
             // Pound sign followed by identifier
             source.consume();
             while let Some(c) = source.next() {
                 if !is_identifier_remaining(c) {
                     break;
+                }
                 source.consume();
+            }
             self.check_ascii(source)?;
             let end_pos = source.pos();
             target.tokens.push(Token::new(TokenKind::Pragma, start_pos));
             target.tokens.push(Token::new(TokenKind::SpanEnd, end_pos));
             Ok(true)
+        }
+    }
     fn consume_line_comment(&mut self, source: &mut InputSource, target: &mut TokenBuffer) -> Result<(), ParseError> {
         let begin_pos = source.pos();
         // Consume the leading "//"
         debug_assert!(source.next().unwrap() == b'/' && source.lookahead(1).unwrap() == b'/');
         source.consume();
         source.consume();
         let mut prev_char = b'/';
         let mut cur_char = b'/';
         while let Some(c) = source.next() {
             prev_char = cur_char;
             cur_char = c;
             if c == b'\n' {
                 // End of line, note that the newline is not consumed
                 break;
+            }
             source.consume();
+        }
         let mut end_pos = source.pos();
         debug_assert_eq!(begin_pos.line, end_pos.line);
         // Modify offset to not include the newline characters
         if cur_char == b'\n' {
             if prev_char == b'\r' {
                 end_pos.offset -= 2;
             } else {
                 end_pos.offset -= 1;
+            }
             // Consume final newline
             source.consume();
         } else {
             // End of comment was due to EOF
             debug_assert!(source.next().is_none())
+        }
         target.tokens.push(Token::new(TokenKind::LineComment, begin_pos));
         target.tokens.push(Token::new(TokenKind::SpanEnd, end_pos));
         Ok(())
+    }
     fn consume_block_comment(&mut self, source: &mut InputSource, target: &mut TokenBuffer) -> Result<(), ParseError> {
         let begin_pos = source.pos();
         // Consume the leading "/*"
         debug_assert!(source.next().unwrap() == b'/' && source.lookahead(1).unwrap() == b'*');
         source.consume();
         source.consume();
         // Explicitly do not put prev_char at "*", because then "/*/" would
         // represent a valid and closed block comment
         let mut prev_char = b' ';
         let mut is_closed = false;
         while let Some(c) = source.next() {
             source.consume();
             if prev_char == b'*' && c == b'/' {
                 // End of block comment
                 is_closed = true;
                 break;
+            }
             prev_char = c;
+        }
         if !is_closed {
             return Err(ParseError::new_error_str_at_pos(
                 source, source.pos(), "encountered unterminated block comment")
             );
+        }
         let end_pos = source.pos();
         target.tokens.push(Token::new(TokenKind::BlockComment, begin_pos));
         target.tokens.push(Token::new(TokenKind::SpanEnd, end_pos));
         Ok(())
+    }
     fn consume_identifier<'a>(&mut self, source: &'a mut InputSource, target: &mut TokenBuffer) -> Result<&'a [u8], ParseError> {
         let begin_pos = source.pos();
         debug_assert!(is_identifier_start(source.next().unwrap()));
         source.consume();
         // Keep reading until no more identifier
         while let Some(c) = source.next() {
             if !is_identifier_remaining(c) {
                 break;
+            }
             source.consume();
+        }
         self.check_ascii(source)?;
         let end_pos = source.pos();
         target.tokens.push(Token::new(TokenKind::Ident, begin_pos));
         target.tokens.push(Token::new(TokenKind::SpanEnd, end_pos));
         Ok(source.section_at_pos(begin_pos, end_pos))
+    }
     fn consume_number(&mut self, source: &mut InputSource, target: &mut TokenBuffer) -> Result<(), ParseError> {
         let begin_pos = source.pos();
         debug_assert!(is_integer_literal_start(source.next().unwrap()));
         source.consume();
         // Keep reading until it doesn't look like a number anymore
         while let Some(c) = source.next() {
             if !maybe_number_remaining(c) {
                 break;
+            }
             source.consume();
+        }
         self.check_ascii(source)?;
         let end_pos = source.pos();
         target.tokens.push(Token::new(TokenKind::Integer, begin_pos));
         target.tokens.push(Token::new(TokenKind::SpanEnd, end_pos));
         Ok(())
+    }
     // Consumes whitespace and returns whether or not the whitespace contained
     // a newline.
     fn consume_whitespace(&self, source: &mut InputSource) -> bool {
         debug_assert!(is_whitespace(source.next().unwrap()));
         let mut has_newline = false;
         while let Some(c) = source.next() {
             if !is_whitespace(c) {
                 break;
+            }
             if c == b'\n' {
                 has_newline = true;
+            }
             source.consume();
+        }
         has_newline
+    }
     fn add_code_range(
         &mut self, target: &mut TokenBuffer, parent_idx: i32,
         code_start_idx: u32, code_end_idx: u32
+        code_start_idx: u32, code_end_idx: u32, next_sibling_idx: i32
     ) {
         let new_range_idx = target.ranges.len() as i32;
         let parent_range = &mut target.ranges[parent_idx as usize];
-        debug_assert_ne!(parent_range.end, code_start_idx, "called push_code_range without a need to do so");
+        debug_assert_ne!(parent_range.end, code_end_idx, "called push_code_range without a need to do so");
         let sibling_idx = parent_range.last_child_idx;
         parent_range.last_child_idx = new_range_idx;
         parent_range.end = code_end_idx;
         parent_range.num_child_ranges += 1;
         let curly_depth = self.curly_stack.len() as u32;
         target.ranges.push(TokenRange{
             parent_idx,
             range_kind: TokenRangeKind::Code,
             curly_depth,
             start: code_start_idx,
             end: code_end_idx,
             num_child_ranges: 0,
             first_child_idx: NO_RELATION,
             last_child_idx: NO_RELATION,
-            next_sibling_idx: new_range_idx + 1, // we're going to push this range below
             next_sibling_idx,
         });
         // Fix up the sibling indices
         if sibling_idx != NO_RELATION {
             let sibling_range = &mut target.ranges[sibling_idx as usize];
             sibling_range.next_sibling_idx = new_range_idx;
+        }
+    }
     fn push_range(&mut self, target: &mut TokenBuffer, range_kind: TokenRangeKind, first_token_idx: u32) {
         let new_range_idx = target.ranges.len() as i32;
         let parent_idx = self.stack_idx as i32;
         let parent_range = &mut target.ranges[self.stack_idx];
         if parent_range.first_child_idx == NO_RELATION {
             parent_range.first_child_idx = new_range_idx;
+        }
         let last_registered_idx = parent_range.end;
         if last_registered_idx != first_token_idx {
             self.add_code_range(target, parent_idx, last_registered_idx, first_token_idx);
+            self.add_code_range(target, parent_idx, last_registered_idx, first_token_idx, new_range_idx + 1);
+        }
         // Push the new range
         self.stack_idx = target.ranges.len();
         let curly_depth = self.curly_stack.len() as u32;
         target.ranges.push(TokenRange{
             parent_idx,
             range_kind,
             curly_depth,
             start: first_token_idx,
             end: first_token_idx, // modified when popped
             num_child_ranges: 0,
             first_child_idx: NO_RELATION,
             last_child_idx: NO_RELATION,
             next_sibling_idx: NO_RELATION
         })
+    }
     fn pop_range(&mut self, target: &mut TokenBuffer, end_token_idx: u32) {
         let popped_idx = self.stack_idx as i32;
         let popped_range = &mut target.ranges[self.stack_idx];
         debug_assert!(self.stack_idx != 0, "attempting to pop top-level range");
         // Fix up the current range before going back to parent
         popped_range.end = end_token_idx;
         debug_assert_ne!(popped_range.start, end_token_idx);
         // Go back to parent and fix up its child pointers, but remember the
         // last child, so we can link it to the newly popped range.
         self.stack_idx = popped_range.parent_idx as usize;
         let parent = &mut target.ranges[self.stack_idx];
         if parent.first_child_idx == NO_RELATION {
             parent.first_child_idx = popped_idx;
+        }
         let prev_sibling_idx = parent.last_child_idx;
         parent.last_child_idx = popped_idx;
         parent.end = end_token_idx;
         parent.num_child_ranges += 1;
         // Fix up the sibling (if it exists)
         if prev_sibling_idx != NO_RELATION {
             let sibling = &mut target.ranges[prev_sibling_idx as usize];
             sibling.next_sibling_idx = popped_idx;
+        }
+    }
     fn check_ascii(&self, source: &InputSource) -> Result<(), ParseError> {
         match source.next() {
             Some(c) if !c.is_ascii() => {
                 Err(ParseError::new_error_str_at_pos(source, source.pos(), "encountered a non-ASCII character"))
             },
             _else => {
                 Ok(())
             },
+        }
+    }
+}
 // Helpers for characters
 fn demarks_definition(ident: &[u8]) -> bool {
     return
         ident == KW_STRUCT ||
             ident == KW_ENUM ||
             ident == KW_UNION ||
             ident == KW_FUNCTION ||
             ident == KW_PRIMITIVE ||
             ident == KW_COMPOSITE
+}
 fn demarks_import(ident: &[u8]) -> bool {
     return ident == KW_IMPORT;
+}
 fn is_whitespace(c: u8) -> bool {
     c.is_ascii_whitespace()
+}
 fn is_char_literal_start(c: u8) -> bool {
     return c == b'\'';
+}
 fn is_string_literal_start(c: u8) -> bool {
     return c == b'"';
+}
 fn is_pragma_start_or_pound(c: u8) -> bool {
     return c == b'#';
+}
 fn is_identifier_start(c: u8) -> bool {
     return
         (c >= b'a' && c <= b'z') ||
             (c >= b'A' && c <= b'Z') ||
             c == b'_'
+}
 fn is_identifier_remaining(c: u8) -> bool {
     return
         (c >= b'0' && c <= b'9') ||
             (c >= b'a' && c <= b'z') ||
             (c >= b'A' && c <= b'Z') ||
             c == b'_'
+}
 fn is_integer_literal_start(c: u8) -> bool {
     return c >= b'0' && c <= b'9';
+}
 fn maybe_number_remaining(c: u8) -> bool {
     // Note: hex range includes the possible binary indicator 'b' and 'B';
     return
         (c == b'b' || c == b'B' || c == b'o' || c == b'O' || c == b'x' || c == b'X') ||
             (c >= b'0' && c <= b'9') ||
         (c == b'o' || c == b'O' || c == b'x' || c == b'X') ||
             (c >= b'0' && c <= b'9') || (c >= b'A' && c <= b'F') || (c >= b'a' && c <= b'f') ||
             c == b'_';
+}
 #[cfg(test)]
 mod tests {
     use super::*;
     // TODO: Remove at some point
     #[test]
     fn test_tokenizer() {
         let mut source = InputSource::new_test("
         #version 500
         # hello 2
         import std.reo::*;
         struct Thing {
             int a: 5,
+        }
         enum Hello {
             A,
+            B
+        }
         // Hello hello, is it me you are looking for?
         // I can seee it in your eeeyes
         func something(int a, int b, int c) -> byte {
             int a = 5;
             struct Inner {
                 int a
+            }
             struct City {
                 int b
+            }
             /* Waza
             How are you doing
             Things in here yo
             /* */ */
             a = a + 5 * 2;
             struct Pressure {
                 int d
+            }
+        }
         ");
         let mut t = PassTokenizer::new();
         let mut buffer = TokenBuffer::new();
         t.tokenize(&mut source, &mut buffer).expect("tokenize");
         println!("Ranges:\n");
         for (idx, range) in buffer.ranges.iter().enumerate() {
             println!("[{}] {:?}", idx, range)
+        }
         println!("Tokens:\n");
         let mut iter = buffer.tokens.iter().enumerate();
         while let Some((idx, token)) = iter.next() {
             match token.kind {
                 TokenKind::Ident | TokenKind::Pragma | TokenKind::Integer |
                 TokenKind::String | TokenKind::Character | TokenKind::LineComment |
                 TokenKind::BlockComment => {
                     let (_, end) = iter.next().unwrap();
                     println!("[{}] {:?} ......", idx, token.kind);
                     assert_eq!(end.kind, TokenKind::SpanEnd);
                     let text = source.section_at_pos(token.pos, end.pos);
                     println!("{}", String::from_utf8_lossy(text));
                 },
                 _ => {
                     println!("[{}] {:?}", idx, token.kind);
+                }
+            }
+        }
+    }
+}
@@ \ No newline at end of file @@

src/protocol/parser/pass_validation_linking.rs

➞

Show inline comments

 use crate::collections::{ScopedBuffer};
 use crate::protocol::ast::*;
 use crate::protocol::input_source::*;
 use crate::protocol::parser::symbol_table::*;
 use crate::protocol::parser::type_table::*;
 use super::visitor::{
     STMT_BUFFER_INIT_CAPACITY,
     EXPR_BUFFER_INIT_CAPACITY,
     Ctx,
     Visitor2,
     VisitorResult
 };
 use crate::protocol::parser::ModuleCompilationPhase;
 #[derive(PartialEq, Eq)]
 enum DefinitionType {
     Primitive(ComponentDefinitionId),
     Composite(ComponentDefinitionId),
     Function(FunctionDefinitionId)
+}
 impl DefinitionType {
     fn is_primitive(&self) -> bool { if let Self::Primitive(_) = self { true } else { false } }
     fn is_composite(&self) -> bool { if let Self::Composite(_) = self { true } else { false } }
     fn is_function(&self) -> bool { if let Self::Function(_) = self { true } else { false } }
     fn definition_id(&self) -> DefinitionId {
         match self {
             DefinitionType::Primitive(v) => v.upcast(),
             DefinitionType::Composite(v) => v.upcast(),
             DefinitionType::Function(v) => v.upcast(),
+        }
+    }
+}
 /// This particular visitor will go through the entire AST in a recursive manner
 /// and check if all statements and expressions are legal (e.g. no "return"
 /// statements in component definitions), and will link certain AST nodes to
 /// their appropriate targets (e.g. goto statements, or function calls).
 ///
 /// This visitor will not perform control-flow analysis (e.g. making sure that
 /// each function actually returns) and will also not perform type checking. So
 /// the linking of function calls and component instantiations will be checked
 /// and linked to the appropriate definitions, but the return types and/or
 /// arguments will not be checked for validity.
 ///
 ///
 /// Because of this scheme expressions will not be visited in the breadth-first
 /// pass.
 pub(crate) struct PassValidationLinking {
     /// `in_sync` is `Some(id)` if the visitor is visiting the children of a
     /// synchronous statement. A single value is sufficient as nested
     /// synchronous statements are not allowed
     in_sync: Option<SynchronousStatementId>,
     /// `in_while` contains the last encountered `While` statement. This is used
     /// to resolve unlabeled `Continue`/`Break` statements.
     in_while: Option<WhileStatementId>,
     // Traversal state: current scope (which can be used to find the parent
     // scope), the definition variant we are considering, and whether the
     // visitor is performing breadthwise block statement traversal.
     cur_scope: Option<Scope>,
     def_type: DefinitionType,
     // Parent expression (the previous stmt/expression we visited that could be
     // used as an expression parent)
     expr_parent: ExpressionParent,
     // Keeping track of relative position in block in the breadth-first pass.
     relative_pos_in_block: u32,
     definition_buffer: ScopedBuffer<DefinitionId>,
     // Single buffer of statement IDs that we want to traverse in a block.
     // Required to work around Rust borrowing rules and to prevent constant
     // cloning of vectors.
     statement_buffer: ScopedBuffer<StatementId>,
     // Another buffer, now with expression IDs, to prevent constant cloning of
     // vectors while working around rust's borrowing rules
     expression_buffer: ScopedBuffer<ExpressionId>,
+}
 impl PassValidationLinking {
     pub(crate) fn new() -> Self {
         Self{
             in_sync: None,
             in_while: None,
             cur_scope: None,
             expr_parent: ExpressionParent::None,
             def_type: DefinitionType::Function(FunctionDefinitionId::new_invalid()),
             relative_pos_in_block: 0,
             definition_buffer: ScopedBuffer::new_reserved(128),
             statement_buffer: ScopedBuffer::new_reserved(STMT_BUFFER_INIT_CAPACITY),
             expression_buffer: ScopedBuffer::new_reserved(EXPR_BUFFER_INIT_CAPACITY),
+        }
+    }
     fn reset_state(&mut self) {
         self.in_sync = None;
         self.in_while = None;
         self.cur_scope = None;
         self.expr_parent = ExpressionParent::None;
         self.def_type = DefinitionType::Function(FunctionDefinitionId::new_invalid());
         self.relative_pos_in_block = 0;
+    }
+}
 impl Visitor2 for PassValidationLinking {
     fn visit_module(&mut self, ctx: &mut Ctx) -> VisitorResult {
         debug_assert_eq!(ctx.module.phase, ModuleCompilationPhase::TypesAddedToTable);
         let root = &ctx.heap[ctx.module.root_id];
         let section = self.definition_buffer.start_section_initialized(&root.definitions);
         for definition_idx in 0..section.len() {
             let definition_id = section[definition_idx];
             self.visit_definition(ctx, definition_id)?;
+        }
         section.forget();
         ctx.module.phase = ModuleCompilationPhase::ValidatedAndLinked;
         Ok(())
+    }
     //--------------------------------------------------------------------------
     // Definition visitors
     //--------------------------------------------------------------------------
     fn visit_component_definition(&mut self, ctx: &mut Ctx, id: ComponentDefinitionId) -> VisitorResult {
         self.reset_state();
         self.def_type = match &ctx.heap[id].variant {
             ComponentVariant::Primitive => DefinitionType::Primitive(id),
             ComponentVariant::Composite => DefinitionType::Composite(id),
         };
         self.cur_scope = Some(Scope::Definition(id.upcast()));
         self.expr_parent = ExpressionParent::None;
         // Visit statements in component body
         let body_id = ctx.heap[id].body;
         self.visit_block_stmt(ctx, body_id)?;
         Ok(())
+    }
     fn visit_function_definition(&mut self, ctx: &mut Ctx, id: FunctionDefinitionId) -> VisitorResult {
         self.reset_state();
         // Set internal statement indices
         self.def_type = DefinitionType::Function(id);
         self.cur_scope = Some(Scope::Definition(id.upcast()));
         self.expr_parent = ExpressionParent::None;
         // Visit statements in function body
         let body_id = ctx.heap[id].body;
         self.visit_block_stmt(ctx, body_id)?;
         Ok(())
+    }
     //--------------------------------------------------------------------------
     // Statement visitors
     //--------------------------------------------------------------------------
     fn visit_block_stmt(&mut self, ctx: &mut Ctx, id: BlockStatementId) -> VisitorResult {
         self.visit_block_stmt_with_hint(ctx, id, None)
+    }
     fn visit_local_memory_stmt(&mut self, _ctx: &mut Ctx, _id: MemoryStatementId) -> VisitorResult {
         Ok(())
+    }
     fn visit_local_channel_stmt(&mut self, _ctx: &mut Ctx, _id: ChannelStatementId) -> VisitorResult {
         Ok(())
+    }
     fn visit_labeled_stmt(&mut self, ctx: &mut Ctx, id: LabeledStatementId) -> VisitorResult {
         let body_id = ctx.heap[id].body;
         self.visit_stmt(ctx, body_id)?;
         Ok(())
+    }
     fn visit_if_stmt(&mut self, ctx: &mut Ctx, id: IfStatementId) -> VisitorResult {
         // Traverse expression and bodies
         let (test_id, true_id, false_id) = {
             let stmt = &ctx.heap[id];
             (stmt.test, stmt.true_body, stmt.false_body)
         };
         debug_assert_eq!(self.expr_parent, ExpressionParent::None);
         self.expr_parent = ExpressionParent::If(id);
         self.visit_expr(ctx, test_id)?;
         self.expr_parent = ExpressionParent::None;
         self.visit_block_stmt(ctx, true_id)?;
         if let Some(false_id) = false_id {
             self.visit_block_stmt(ctx, false_id)?;
+        }
         Ok(())
+    }
     fn visit_while_stmt(&mut self, ctx: &mut Ctx, id: WhileStatementId) -> VisitorResult {
         let (test_id, body_id) = {
             let stmt = &ctx.heap[id];
             (stmt.test, stmt.body)
         };
         let old_while = self.in_while.replace(id);
         debug_assert_eq!(self.expr_parent, ExpressionParent::None);
         self.expr_parent = ExpressionParent::While(id);
         self.visit_expr(ctx, test_id)?;
         self.expr_parent = ExpressionParent::None;
         self.visit_block_stmt(ctx, body_id)?;
         self.in_while = old_while;
         Ok(())
+    }
     fn visit_break_stmt(&mut self, ctx: &mut Ctx, id: BreakStatementId) -> VisitorResult {
         // Resolve break target
         let target_end_while = {
             let stmt = &ctx.heap[id];
             let target_while_id = self.resolve_break_or_continue_target(ctx, stmt.span, &stmt.label)?;
             let target_while = &ctx.heap[target_while_id];
             debug_assert!(target_while.end_while.is_some());
             target_while.end_while.unwrap()
         };
         let stmt = &mut ctx.heap[id];
         stmt.target = Some(target_end_while);
         Ok(())
+    }
     fn visit_continue_stmt(&mut self, ctx: &mut Ctx, id: ContinueStatementId) -> VisitorResult {
         // Resolve continue target
         let target_while_id = {
             let stmt = &ctx.heap[id];
             self.resolve_break_or_continue_target(ctx, stmt.span, &stmt.label)?
         };
         let stmt = &mut ctx.heap[id];
         stmt.target = Some(target_while_id);
         Ok(())
+    }
     fn visit_synchronous_stmt(&mut self, ctx: &mut Ctx, id: SynchronousStatementId) -> VisitorResult {
         // Check for validity of synchronous statement
         let cur_sync_span = ctx.heap[id].span;
         if self.in_sync.is_some() {
             // Nested synchronous statement
             let old_sync_span = ctx.heap[self.in_sync.unwrap()].span;
             return Err(ParseError::new_error_str_at_span(
                 &ctx.module.source, cur_sync_span, "Illegal nested synchronous statement"
             ).with_info_str_at_span(
                 &ctx.module.source, old_sync_span, "It is nested in this synchronous statement"
             ));
+        }
         if !self.def_type.is_primitive() {
             return Err(ParseError::new_error_str_at_span(
                 &ctx.module.source, cur_sync_span,
                 "synchronous statements may only be used in primitive components"
             ));
+        }
         let sync_body = ctx.heap[id].body;
         let old = self.in_sync.replace(id);
         self.visit_block_stmt_with_hint(ctx, sync_body, Some(id))?;
         self.in_sync = old;
         Ok(())
+    }
     fn visit_return_stmt(&mut self, ctx: &mut Ctx, id: ReturnStatementId) -> VisitorResult {
         // Check if "return" occurs within a function
         let stmt = &ctx.heap[id];
         if !self.def_type.is_function() {
             return Err(ParseError::new_error_str_at_span(
                 &ctx.module.source, stmt.span,
                 "return statements may only appear in function bodies"
             ));
+        }
         // If here then we are within a function
         debug_assert_eq!(self.expr_parent, ExpressionParent::None);
         debug_assert_eq!(ctx.heap[id].expressions.len(), 1);
         self.expr_parent = ExpressionParent::Return(id);
         self.visit_expr(ctx, ctx.heap[id].expressions[0])?;
         self.expr_parent = ExpressionParent::None;
         Ok(())
+    }
     fn visit_goto_stmt(&mut self, ctx: &mut Ctx, id: GotoStatementId) -> VisitorResult {
         let target_id = self.find_label(ctx, &ctx.heap[id].label)?;
         ctx.heap[id].target = Some(target_id);
         let target = &ctx.heap[target_id];
         if self.in_sync != target.in_sync {
             // We can only goto the current scope or outer scopes. Because
             // nested sync statements are not allowed so if the value does
             // not match, then we must be inside a sync scope
             debug_assert!(self.in_sync.is_some());
             let goto_stmt = &ctx.heap[id];
             let sync_stmt = &ctx.heap[self.in_sync.unwrap()];
             return Err(
                 ParseError::new_error_str_at_span(&ctx.module.source, goto_stmt.span, "goto may not escape the surrounding synchronous block")
                 .with_info_str_at_span(&ctx.module.source, target.label.span, "this is the target of the goto statement")
                 .with_info_str_at_span(&ctx.module.source, sync_stmt.span, "which will jump past this statement")
             );
+        }
         Ok(())
+    }
     fn visit_new_stmt(&mut self, ctx: &mut Ctx, id: NewStatementId) -> VisitorResult {
         // Make sure the new statement occurs inside a composite component
         if !self.def_type.is_composite() {
             let new_stmt = &ctx.heap[id];
             return Err(ParseError::new_error_str_at_span(
                 &ctx.module.source, new_stmt.span,
                 "instantiating components may only be done in composite components"
             ));
+        }
         // Recurse into call expression (which will check the expression parent
         // to ensure that the "new" statment instantiates a component)
         let call_expr_id = ctx.heap[id].expression;
         debug_assert_eq!(self.expr_parent, ExpressionParent::None);
         self.expr_parent = ExpressionParent::New(id);
         self.visit_call_expr(ctx, call_expr_id)?;
         self.expr_parent = ExpressionParent::None;
         Ok(())
+    }
     fn visit_expr_stmt(&mut self, ctx: &mut Ctx, id: ExpressionStatementId) -> VisitorResult {
         let expr_id = ctx.heap[id].expression;
         debug_assert_eq!(self.expr_parent, ExpressionParent::None);
         self.expr_parent = ExpressionParent::ExpressionStmt(id);
         self.visit_expr(ctx, expr_id)?;
         self.expr_parent = ExpressionParent::None;
         Ok(())
+    }
     //--------------------------------------------------------------------------
     // Expression visitors
     //--------------------------------------------------------------------------
     fn visit_assignment_expr(&mut self, ctx: &mut Ctx, id: AssignmentExpressionId) -> VisitorResult {
         let upcast_id = id.upcast();
         let assignment_expr = &mut ctx.heap[id];
         let left_expr_id = assignment_expr.left;
         let right_expr_id = assignment_expr.right;
         let old_expr_parent = self.expr_parent;
         assignment_expr.parent = old_expr_parent;
         self.expr_parent = ExpressionParent::Expression(upcast_id, 0);
         self.visit_expr(ctx, left_expr_id)?;
         self.expr_parent = ExpressionParent::Expression(upcast_id, 1);
         self.visit_expr(ctx, right_expr_id)?;
         self.expr_parent = old_expr_parent;
         Ok(())
+    }
     fn visit_conditional_expr(&mut self, ctx: &mut Ctx, id: ConditionalExpressionId) -> VisitorResult {
         let upcast_id = id.upcast();
         let conditional_expr = &mut ctx.heap[id];
         let test_expr_id = conditional_expr.test;
         let true_expr_id = conditional_expr.true_expression;
         let false_expr_id = conditional_expr.false_expression;
         let old_expr_parent = self.expr_parent;
         conditional_expr.parent = old_expr_parent;
         self.expr_parent = ExpressionParent::Expression(upcast_id, 0);
         self.visit_expr(ctx, test_expr_id)?;
         self.expr_parent = ExpressionParent::Expression(upcast_id, 1);
         self.visit_expr(ctx, true_expr_id)?;
         self.expr_parent = ExpressionParent::Expression(upcast_id, 2);
         self.visit_expr(ctx, false_expr_id)?;
         self.expr_parent = old_expr_parent;
         Ok(())
+    }
     fn visit_binary_expr(&mut self, ctx: &mut Ctx, id: BinaryExpressionId) -> VisitorResult {
         let upcast_id = id.upcast();
         let binary_expr = &mut ctx.heap[id];
         let left_expr_id = binary_expr.left;
         let right_expr_id = binary_expr.right;
         let old_expr_parent = self.expr_parent;
         binary_expr.parent = old_expr_parent;
         self.expr_parent = ExpressionParent::Expression(upcast_id, 0);
         self.visit_expr(ctx, left_expr_id)?;
         self.expr_parent = ExpressionParent::Expression(upcast_id, 1);
         self.visit_expr(ctx, right_expr_id)?;
         self.expr_parent = old_expr_parent;
         Ok(())
+    }
     fn visit_unary_expr(&mut self, ctx: &mut Ctx, id: UnaryExpressionId) -> VisitorResult {
         let unary_expr = &mut ctx.heap[id];
         let expr_id = unary_expr.expression;
         let old_expr_parent = self.expr_parent;
         unary_expr.parent = old_expr_parent;
         self.expr_parent = ExpressionParent::Expression(id.upcast(), 0);
         self.visit_expr(ctx, expr_id)?;
         self.expr_parent = old_expr_parent;
         Ok(())
+    }
     fn visit_indexing_expr(&mut self, ctx: &mut Ctx, id: IndexingExpressionId) -> VisitorResult {
         let upcast_id = id.upcast();
         let indexing_expr = &mut ctx.heap[id];
         let subject_expr_id = indexing_expr.subject;
         let index_expr_id = indexing_expr.index;
         let old_expr_parent = self.expr_parent;
         indexing_expr.parent = old_expr_parent;
         self.expr_parent = ExpressionParent::Expression(upcast_id, 0);
         self.visit_expr(ctx, subject_expr_id)?;
         self.expr_parent = ExpressionParent::Expression(upcast_id, 1);
         self.visit_expr(ctx, index_expr_id)?;
         self.expr_parent = old_expr_parent;
         Ok(())
+    }
     fn visit_slicing_expr(&mut self, ctx: &mut Ctx, id: SlicingExpressionId) -> VisitorResult {
         let upcast_id = id.upcast();
         let slicing_expr = &mut ctx.heap[id];
         let subject_expr_id = slicing_expr.subject;
         let from_expr_id = slicing_expr.from_index;
         let to_expr_id = slicing_expr.to_index;
         let old_expr_parent = self.expr_parent;
         slicing_expr.parent = old_expr_parent;
         self.expr_parent = ExpressionParent::Expression(upcast_id, 0);
         self.visit_expr(ctx, subject_expr_id)?;
         self.expr_parent = ExpressionParent::Expression(upcast_id, 1);
         self.visit_expr(ctx, from_expr_id)?;
         self.expr_parent = ExpressionParent::Expression(upcast_id, 2);
         self.visit_expr(ctx, to_expr_id)?;
         self.expr_parent = old_expr_parent;
         Ok(())
+    }
     fn visit_select_expr(&mut self, ctx: &mut Ctx, id: SelectExpressionId) -> VisitorResult {
         let select_expr = &mut ctx.heap[id];
         let expr_id = select_expr.subject;
         let old_expr_parent = self.expr_parent;
         select_expr.parent = old_expr_parent;
         self.expr_parent = ExpressionParent::Expression(id.upcast(), 0);
         self.visit_expr(ctx, expr_id)?;
         self.expr_parent = old_expr_parent;
         Ok(())
+    }
     fn visit_literal_expr(&mut self, ctx: &mut Ctx, id: LiteralExpressionId) -> VisitorResult {
         let literal_expr = &mut ctx.heap[id];
         let old_expr_parent = self.expr_parent;
         literal_expr.parent = old_expr_parent;
         match &mut literal_expr.value {
             Literal::Null | Literal::True | Literal::False |
             Literal::Character(_) | Literal::String(_) | Literal::Integer(_) => {
                 // Just the parent has to be set, done above
             },
             Literal::Struct(literal) => {
                 let upcast_id = id.upcast();
                 // Retrieve type definition
                 let type_definition = ctx.types.get_base_definition(&literal.definition).unwrap();
                 let struct_definition = type_definition.definition.as_struct();
                 // Make sure all fields are specified, none are specified twice
                 // and all fields exist on the struct definition
                 let mut specified = Vec::new(); // TODO: @performance
                 specified.resize(struct_definition.fields.len(), false);
                 for field in &mut literal.fields {
                     // Find field in the struct definition
                     let field_idx = struct_definition.fields.iter().position(|v| v.identifier == field.identifier);
                     if field_idx.is_none() {
                         let field_span = field.identifier.span;
                         let literal = ctx.heap[id].value.as_struct();
                         let ast_definition = &ctx.heap[literal.definition];
                         return Err(ParseError::new_error_at_span(
                             &ctx.module.source, field_span, format!(
                                 "This field does not exist on the struct '{}'",
                                 ast_definition.identifier().value.as_str()
+                            )
                         ));
+                    }
                     field.field_idx = field_idx.unwrap();
                     // Check if specified more than once
                     if specified[field.field_idx] {
                         return Err(ParseError::new_error_str_at_span(
                             &ctx.module.source, field.identifier.span,
                             "This field is specified more than once"
                         ));
+                    }
                     specified[field.field_idx] = true;
+                }
                 if !specified.iter().all(|v| *v) {
                     // Some fields were not specified
                     let mut not_specified = String::new();
                     let mut num_not_specified = 0;
                     for (def_field_idx, is_specified) in specified.iter().enumerate() {
                         if !is_specified {
                             if !not_specified.is_empty() { not_specified.push_str(", ") }
                             let field_ident = &struct_definition.fields[def_field_idx].identifier;
                             not_specified.push_str(field_ident.value.as_str());
                             num_not_specified += 1;
+                        }
+                    }
                     debug_assert!(num_not_specified > 0);
                     let msg = if num_not_specified == 1 {
                         format!("not all fields are specified, '{}' is missing", not_specified)
                     } else {
                         format!("not all fields are specified, [{}] are missing", not_specified)
                     };
                     return Err(ParseError::new_error_at_span(
                         &ctx.module.source, literal.parser_type.elements[0].full_span, msg
                     ));
+                }
                 // Need to traverse fields expressions in struct and evaluate
                 // the poly args
                 let mut expr_section = self.expression_buffer.start_section();
                 for field in &literal.fields {
                     expr_section.push(field.value);
+                }
                 for expr_idx in 0..expr_section.len() {
                     let expr_id = expr_section[expr_idx];
                     self.expr_parent = ExpressionParent::Expression(upcast_id, expr_idx as u32);
                     self.visit_expr(ctx, expr_id)?;
+                }
                 expr_section.forget();
             },
             Literal::Enum(literal) => {
                 // Make sure the variant exists
                 let type_definition = ctx.types.get_base_definition(&literal.definition).unwrap();
                 let enum_definition = type_definition.definition.as_enum();
                 let variant_idx = enum_definition.variants.iter().position(|v| {
                     v.identifier == literal.variant
                 });
                 if variant_idx.is_none() {
                     let literal = ctx.heap[id].value.as_enum();
                     let ast_definition = ctx.heap[literal.definition].as_enum();
                     return Err(ParseError::new_error_at_span(
                         &ctx.module.source, literal.parser_type.elements[0].full_span, format!(
                             "the variant '{}' does not exist on the enum '{}'",
                             literal.variant.value.as_str(), ast_definition.identifier.value.as_str()
+                        )
                     ));
+                }
                 literal.variant_idx = variant_idx.unwrap();
             },
             Literal::Union(literal) => {
                 // Make sure the variant exists
                 let type_definition = ctx.types.get_base_definition(&literal.definition).unwrap();
                 let union_definition = type_definition.definition.as_union();
                 let variant_idx = union_definition.variants.iter().position(|v| {
                     v.identifier == literal.variant
                 });
                 if variant_idx.is_none() {
                     let literal = ctx.heap[id].value.as_union();
                     let ast_definition = ctx.heap[literal.definition].as_union();
                     return Err(ParseError::new_error_at_span(
                         &ctx.module.source, literal.parser_type.elements[0].full_span, format!(
-                            "the variant does '{}' does not exist on the union '{}'",
                             "the variant '{}' does not exist on the union '{}'",
                             literal.variant.value.as_str(), ast_definition.identifier.value.as_str()
+                        )
                     ));
+                }
                 literal.variant_idx = variant_idx.unwrap();
                 // Make sure the number of specified values matches the expected
                 // number of embedded values in the union variant.
                 let union_variant = &union_definition.variants[literal.variant_idx];
                 if union_variant.embedded.len() != literal.values.len() {
                     let literal = ctx.heap[id].value.as_union();
                     let ast_definition = ctx.heap[literal.definition].as_union();
                     return Err(ParseError::new_error_at_span(
                         &ctx.module.source, literal.parser_type.elements[0].full_span, format!(
                             "The variant '{}' of union '{}' expects {} embedded values, but {} were specified",
                             literal.variant.value.as_str(), ast_definition.identifier.value.as_str(),
                             union_variant.embedded.len(), literal.values.len()
                         ),
                     ))
+                }
                 // Traverse embedded values of union (if any) and evaluate the
                 // polymorphic arguments
                 let upcast_id = id.upcast();
                 let mut expr_section = self.expression_buffer.start_section();
                 for value in &literal.values {
                     expr_section.push(*value);
+                }
                 for expr_idx in 0..expr_section.len() {
                     let expr_id = expr_section[expr_idx];
                     self.expr_parent = ExpressionParent::Expression(upcast_id, expr_idx as u32);
                     self.visit_expr(ctx, expr_id)?;
+                }
                 expr_section.forget();
             },
             Literal::Array(literal) => {
                 // Visit all expressions in the array
                 let upcast_id = id.upcast();
                 let expr_section = self.expression_buffer.start_section_initialized(literal);
                 for expr_idx in 0..expr_section.len() {
                     let expr_id = expr_section[expr_idx];
                     self.expr_parent = ExpressionParent::Expression(upcast_id, expr_idx as u32);
                     self.visit_expr(ctx, expr_id)?;
+                }
                 expr_section.forget();
+            }
+        }
         self.expr_parent = old_expr_parent;
         Ok(())
+    }
     fn visit_call_expr(&mut self, ctx: &mut Ctx, id: CallExpressionId) -> VisitorResult {
         let call_expr = &mut ctx.heap[id];
         // Check whether the method is allowed to be called within the code's
         // context (in sync, definition type, etc.)
         let mut expected_wrapping_new_stmt = false;
         match &mut call_expr.method {
             Method::Get => {
                 if !self.def_type.is_primitive() {
                     return Err(ParseError::new_error_str_at_span(
                         &ctx.module.source, call_expr.span,
                         "a call to 'get' may only occur in primitive component definitions"
                     ));
+                }
                 if self.in_sync.is_none() {
                     return Err(ParseError::new_error_str_at_span(
                         &ctx.module.source, call_expr.span,
                         "a call to 'get' may only occur inside synchronous blocks"
                     ));
+                }
             },
             Method::Put => {
                 if !self.def_type.is_primitive() {
                     return Err(ParseError::new_error_str_at_span(
                         &ctx.module.source, call_expr.span,
                         "a call to 'put' may only occur in primitive component definitions"
                     ));
+                }
                 if self.in_sync.is_none() {
                     return Err(ParseError::new_error_str_at_span(
                         &ctx.module.source, call_expr.span,
                         "a call to 'put' may only occur inside synchronous blocks"
                     ));
+                }
             },
             Method::Fires => {
                 if !self.def_type.is_primitive() {
                     return Err(ParseError::new_error_str_at_span(
                         &ctx.module.source, call_expr.span,
                         "a call to 'fires' may only occur in primitive component definitions"
                     ));
+                }
                 if self.in_sync.is_none() {
                     return Err(ParseError::new_error_str_at_span(
                         &ctx.module.source, call_expr.span,
                         "a call to 'fires' may only occur inside synchronous blocks"
                     ));
+                }
             },
             Method::Create => {},
             Method::Length => {},
             Method::Assert => {
                 if self.def_type.is_function() {
                     return Err(ParseError::new_error_str_at_span(
                         &ctx.module.source, call_expr.span,
                         "assert statement may only occur in components"
                     ));
+                }
                 if self.in_sync.is_none() {
                     return Err(ParseError::new_error_str_at_span(
                         &ctx.module.source, call_expr.span,
                         "assert statements may only occur inside synchronous blocks"
                     ));
+                }
             },
             Method::UserFunction => {},
             Method::UserComponent => {
                 expected_wrapping_new_stmt = true;
             },
+        }
         if expected_wrapping_new_stmt {
             if !self.expr_parent.is_new() {
                 return Err(ParseError::new_error_str_at_span(
                     &ctx.module.source, call_expr.span,
                     "cannot call a component, it can only be instantiated by using 'new'"
                 ));
+            }
         } else {
             if self.expr_parent.is_new() {
                 return Err(ParseError::new_error_str_at_span(
                     &ctx.module.source, call_expr.span,
                     "only components can be instantiated, this is a function"
                 ));
+            }
+        }
         // Check the number of arguments
         let call_definition = ctx.types.get_base_definition(&call_expr.definition).unwrap();
         let num_expected_args = match &call_definition.definition {
             DefinedTypeVariant::Function(definition) => definition.arguments.len(),
             DefinedTypeVariant::Component(definition) => definition.arguments.len(),
             v => unreachable!("encountered {} type in call expression", v.type_class()),
         };
         let num_provided_args = call_expr.arguments.len();
         if num_provided_args != num_expected_args {
             let argument_text = if num_expected_args == 1 { "argument" } else { "arguments" };
             return Err(ParseError::new_error_at_span(
                 &ctx.module.source, call_expr.span, format!(
                     "expected {} {}, but {} were provided",
                     num_expected_args, argument_text, num_provided_args
+                )
             ));
+        }
         // Recurse into all of the arguments and set the expression's parent
         let upcast_id = id.upcast();
         let section = self.expression_buffer.start_section_initialized(&call_expr.arguments);
         let old_expr_parent = self.expr_parent;
         call_expr.parent = old_expr_parent;
         for arg_expr_idx in 0..section.len() {
             let arg_expr_id = section[arg_expr_idx];
             self.expr_parent = ExpressionParent::Expression(upcast_id, arg_expr_idx as u32);
             self.visit_expr(ctx, arg_expr_id)?;
+        }
         section.forget();
         self.expr_parent = old_expr_parent;
         Ok(())
+    }
     fn visit_variable_expr(&mut self, ctx: &mut Ctx, id: VariableExpressionId) -> VisitorResult {
         let var_expr = &ctx.heap[id];
         let variable_id = self.find_variable(ctx, self.relative_pos_in_block, &var_expr.identifier)?;
         let var_expr = &mut ctx.heap[id];
         var_expr.declaration = Some(variable_id);
         var_expr.parent = self.expr_parent;
         Ok(())
+    }
+}
 impl PassValidationLinking {
     //--------------------------------------------------------------------------
     // Special traversal
     //--------------------------------------------------------------------------
     fn visit_block_stmt_with_hint(&mut self, ctx: &mut Ctx, id: BlockStatementId, hint: Option<SynchronousStatementId>) -> VisitorResult {
         // Set parent scope and relative position in the parent scope. Remember
         // these values to set them back to the old values when we're done with
         // the traversal of the block's statements.
         let body = &mut ctx.heap[id];
         body.parent_scope = self.cur_scope.clone();
         body.relative_pos_in_parent = self.relative_pos_in_block;
         let old_scope = self.cur_scope.replace(match hint {
             Some(sync_id) => Scope::Synchronous((sync_id, id)),
             None => Scope::Regular(id),
         });
         let old_relative_pos = self.relative_pos_in_block;
         // Copy statement IDs into buffer
         let statement_section = self.statement_buffer.start_section_initialized(&body.statements);
         // Perform the breadth-first pass. Its main purpose is to find labeled
         // statements such that we can find the `goto`-targets immediately when
         // performing the depth pass
         for stmt_idx in 0..statement_section.len() {
             self.relative_pos_in_block = stmt_idx as u32;
             self.visit_statement_for_locals_labels_and_in_sync(ctx, self.relative_pos_in_block, statement_section[stmt_idx])?;
+        }
         for stmt_idx in 0..statement_section.len() {
             self.relative_pos_in_block = stmt_idx as u32;
             self.visit_stmt(ctx, statement_section[stmt_idx])?;
+        }
         self.cur_scope = old_scope;
         self.relative_pos_in_block = old_relative_pos;
         statement_section.forget();
         Ok(())
+    }
     fn visit_statement_for_locals_labels_and_in_sync(&mut self, ctx: &mut Ctx, relative_pos: u32, id: StatementId) -> VisitorResult {
         let statement = &mut ctx.heap[id];
         match statement {
             Statement::Local(stmt) => {
                 match stmt {
                     LocalStatement::Memory(local) => {
                         let variable_id = local.variable;
                         self.checked_local_add(ctx, relative_pos, variable_id)?;
                     },
                     LocalStatement::Channel(local) => {
                         let from_id = local.from;
                         let to_id = local.to;
                         self.checked_local_add(ctx, relative_pos, from_id)?;
                         self.checked_local_add(ctx, relative_pos, to_id)?;
+                    }
+                }
+            }
             Statement::Labeled(stmt) => {
                 let stmt_id = stmt.this;
                 let body_id = stmt.body;
                 self.checked_label_add(ctx, relative_pos, self.in_sync, stmt_id)?;
                 self.visit_statement_for_locals_labels_and_in_sync(ctx, relative_pos, body_id)?;
             },
             Statement::While(stmt) => {
                 stmt.in_sync = self.in_sync;
             },
             _ => {},
+        }
         return Ok(())
+    }
     //--------------------------------------------------------------------------
     // Utilities
     //--------------------------------------------------------------------------
     /// Adds a local variable to the current scope. It will also annotate the
     /// `Local` in the AST with its relative position in the block.
     fn checked_local_add(&mut self, ctx: &mut Ctx, relative_pos: u32, id: LocalId) -> Result<(), ParseError> {
         debug_assert!(self.cur_scope.is_some());
         // Make sure we do not conflict with any global symbols
         let cur_scope = SymbolScope::Definition(self.def_type.definition_id());
+        {
             let ident = &ctx.heap[id].identifier;
             if let Some(symbol) = ctx.symbols.get_symbol_by_name(cur_scope, &ident.value.as_bytes()) {
                 return Err(ParseError::new_error_str_at_span(
                     &ctx.module.source, ident.span,
                     "local variable declaration conflicts with symbol"
                 ).with_info_str_at_span(
                     &ctx.module.source, symbol.variant.span_of_introduction(&ctx.heap), "the conflicting symbol is introduced here"
                 ));
+            }
+        }
         let local = &mut ctx.heap[id];
         local.relative_pos_in_block = relative_pos;
         // Make sure we do not shadow any variables in any of the scopes. Note
         // that variables in parent scopes may be declared later
         let local = &ctx.heap[id];
         let mut scope = self.cur_scope.as_ref().unwrap();
         let mut local_relative_pos = self.relative_pos_in_block;
         loop {
             debug_assert!(scope.is_block(), "scope is not a block");
             let block = &ctx.heap[scope.to_block()];
             for other_local_id in &block.locals {
                 let other_local = &ctx.heap[*other_local_id];
                 // Position check in case another variable with the same name
                 // is defined in a higher-level scope, but later than the scope
                 // in which the current variable resides.
                 if local.this != *other_local_id &&
                     local_relative_pos >= other_local.relative_pos_in_block &&
                     local.identifier == other_local.identifier {
                     // Collision within this scope
                     return Err(
                         ParseError::new_error_str_at_span(
                             &ctx.module.source, local.identifier.span, "Local variable name conflicts with another variable"
                         ).with_info_str_at_span(
                             &ctx.module.source, other_local.identifier.span, "Previous variable is found here"
+                        )
                     );
+                }
+            }
             // Current scope is fine, move to parent scope if any
             debug_assert!(block.parent_scope.is_some(), "block scope does not have a parent");
             scope = block.parent_scope.as_ref().unwrap();
             if let Scope::Definition(definition_id) = scope {
                 // At outer scope, check parameters of function/component
                 for parameter_id in ctx.heap[*definition_id].parameters() {
                     let parameter = &ctx.heap[*parameter_id];
                     if local.identifier == parameter.identifier {
                         return Err(
                             ParseError::new_error_str_at_span(
                                 &ctx.module.source, local.identifier.span, "Local variable name conflicts with parameter"
                             ).with_info_str_at_span(
                                 &ctx.module.source, parameter.span, "Parameter definition is found here"
+                            )
                         );
+                    }
+                }
                 break;
+            }
             // If here, then we are dealing with a block-like parent block
             local_relative_pos = ctx.heap[scope.to_block()].relative_pos_in_parent;
+        }
         // No collisions at all
         let block = &mut ctx.heap[self.cur_scope.as_ref().unwrap().to_block()];
         block.locals.push(id);
         Ok(())
+    }
     /// Finds a variable in the visitor's scope that must appear before the
     /// specified relative position within that block.
     fn find_variable(&self, ctx: &Ctx, mut relative_pos: u32, identifier: &Identifier) -> Result<VariableId, ParseError> {
         debug_assert!(self.cur_scope.is_some());
         // TODO: May still refer to an alias of a global symbol using a single
         //  identifier in the namespace.
         // No need to use iterator over namespaces if here
         let mut scope = self.cur_scope.as_ref().unwrap();
         loop {
             debug_assert!(scope.is_block());
             let block = &ctx.heap[scope.to_block()];
             for local_id in &block.locals {
                 let local = &ctx.heap[*local_id];
                 if local.relative_pos_in_block < relative_pos && identifier == &local.identifier {
                     return Ok(local_id.upcast());
+                }
+            }
             debug_assert!(block.parent_scope.is_some());
             scope = block.parent_scope.as_ref().unwrap();
             if !scope.is_block() {
                 // Definition scope, need to check arguments to definition
                 match scope {
                     Scope::Definition(definition_id) => {
                         let definition = &ctx.heap[*definition_id];
                         for parameter_id in definition.parameters() {
                             let parameter = &ctx.heap[*parameter_id];
                             if identifier == &parameter.identifier {
                                 return Ok(parameter_id.upcast());
+                            }
+                        }
                     },
                     _ => unreachable!(),
+                }
                 // Variable could not be found
                 return Err(ParseError::new_error_str_at_span(
                     &ctx.module.source, identifier.span, "unresolved variable"
                 ));
             } else {
                 relative_pos = block.relative_pos_in_parent;
+            }
+        }
+    }
     /// Adds a particular label to the current scope. Will return an error if
     /// there is another label with the same name visible in the current scope.
     fn checked_label_add(&mut self, ctx: &mut Ctx, relative_pos: u32, in_sync: Option<SynchronousStatementId>, id: LabeledStatementId) -> Result<(), ParseError> {
         debug_assert!(self.cur_scope.is_some());
         // Make sure label is not defined within the current scope or any of the
         // parent scope.
         let label = &mut ctx.heap[id];
         label.relative_pos_in_block = relative_pos;
         label.in_sync = in_sync;
         let label = &ctx.heap[id];
         let mut scope = self.cur_scope.as_ref().unwrap();
         loop {
             debug_assert!(scope.is_block(), "scope is not a block");
             let block = &ctx.heap[scope.to_block()];
             for other_label_id in &block.labels {
                 let other_label = &ctx.heap[*other_label_id];
                 if other_label.label == label.label {
                     // Collision
                     return Err(ParseError::new_error_str_at_span(
                         &ctx.module.source, label.label.span, "label name is used more than once"
                     ).with_info_str_at_span(
                         &ctx.module.source, other_label.label.span, "the other label is found here"
                     ));
+                }
+            }
             debug_assert!(block.parent_scope.is_some(), "block scope does not have a parent");
             scope = block.parent_scope.as_ref().unwrap();
             if !scope.is_block() {
                 break;
+            }
+        }
         // No collisions
         let block = &mut ctx.heap[self.cur_scope.as_ref().unwrap().to_block()];
         block.labels.push(id);
         Ok(())
+    }
     /// Finds a particular labeled statement by its identifier. Once found it
     /// will make sure that the target label does not skip over any variable
     /// declarations within the scope in which the label was found.
     fn find_label(&self, ctx: &Ctx, identifier: &Identifier) -> Result<LabeledStatementId, ParseError> {
         debug_assert!(self.cur_scope.is_some());
         let mut scope = self.cur_scope.as_ref().unwrap();
         loop {
             debug_assert!(scope.is_block(), "scope is not a block");
             let relative_scope_pos = ctx.heap[scope.to_block()].relative_pos_in_parent;
             let block = &ctx.heap[scope.to_block()];
             for label_id in &block.labels {
                 let label = &ctx.heap[*label_id];
                 if label.label == *identifier {
                     for local_id in &block.locals {
                         // TODO: Better to do this in control flow analysis, it
                         //  is legal to skip over a variable declaration if it
                         //  is not actually being used. I might be missing
                         //  something here when laying out the bytecode...
                         let local = &ctx.heap[*local_id];
                         if local.relative_pos_in_block > relative_scope_pos && local.relative_pos_in_block < label.relative_pos_in_block {
                             return Err(
                                 ParseError::new_error_str_at_span(&ctx.module.source, identifier.span, "this target label skips over a variable declaration")
                                 .with_info_str_at_span(&ctx.module.source, label.label.span, "because it jumps to this label")
                                 .with_info_str_at_span(&ctx.module.source, local.identifier.span, "which skips over this variable")
                             );
+                        }
+                    }
                     return Ok(*label_id);
+                }
+            }
             debug_assert!(block.parent_scope.is_some(), "block scope does not have a parent");
             scope = block.parent_scope.as_ref().unwrap();
             if !scope.is_block() {
                 return Err(ParseError::new_error_str_at_span(
                     &ctx.module.source, identifier.span, "could not find this label"
                 ));
+            }
+        }
+    }
     /// This function will check if the provided while statement ID has a block
     /// statement that is one of our current parents.
     fn has_parent_while_scope(&self, ctx: &Ctx, id: WhileStatementId) -> bool {
         debug_assert!(self.cur_scope.is_some());
         let mut scope = self.cur_scope.as_ref().unwrap();
         let while_stmt = &ctx.heap[id];
         loop {
             debug_assert!(scope.is_block());
             let block = scope.to_block();
             if while_stmt.body == block {
                 return true;
+            }
             let block = &ctx.heap[block];
             debug_assert!(block.parent_scope.is_some(), "block scope does not have a parent");
             scope = block.parent_scope.as_ref().unwrap();
             if !scope.is_block() {
                 return false;
+            }
+        }
+    }
     /// This function should be called while dealing with break/continue
     /// statements. It will try to find the targeted while statement, using the
     /// target label if provided. If a valid target is found then the loop's
     /// ID will be returned, otherwise a parsing error is constructed.
     /// The provided input position should be the position of the break/continue
     /// statement.
     fn resolve_break_or_continue_target(&self, ctx: &Ctx, span: InputSpan, label: &Option<Identifier>) -> Result<WhileStatementId, ParseError> {
         let target = match label {
             Some(label) => {
                 let target_id = self.find_label(ctx, label)?;
                 // Make sure break target is a while statement
                 let target = &ctx.heap[target_id];
                 if let Statement::While(target_stmt) = &ctx.heap[target.body] {
                     // Even though we have a target while statement, the break might not be
                     // present underneath this particular labeled while statement
                     if !self.has_parent_while_scope(ctx, target_stmt.this) {
                         return Err(ParseError::new_error_str_at_span(
                             &ctx.module.source, label.span, "break statement is not nested under the target label's while statement"
                         ).with_info_str_at_span(
                             &ctx.module.source, target.label.span, "the targeted label is found here"
                         ));
+                    }
                     target_stmt.this
                 } else {
                     return Err(ParseError::new_error_str_at_span(
                         &ctx.module.source, label.span, "incorrect break target label, it must target a while loop"
                     ).with_info_str_at_span(
                         &ctx.module.source, target.label.span, "The targeted label is found here"
                     ));
+                }
             },
             None => {
                 // Use the enclosing while statement, the break must be
                 // nested within that while statement
                 if self.in_while.is_none() {
                     return Err(ParseError::new_error_str_at_span(
                         &ctx.module.source, span, "Break statement is not nested under a while loop"
                     ));
+                }
                 self.in_while.unwrap()
+            }
         };
         // We have a valid target for the break statement. But we need to
         // make sure we will not break out of a synchronous block
+        {
             let target_while = &ctx.heap[target];
             if target_while.in_sync != self.in_sync {
                 // Break is nested under while statement, so can only escape a
                 // sync block if the sync is nested inside the while statement.
                 debug_assert!(self.in_sync.is_some());
                 let sync_stmt = &ctx.heap[self.in_sync.unwrap()];
                 return Err(
                     ParseError::new_error_str_at_span(&ctx.module.source, span, "break may not escape the surrounding synchronous block")
                         .with_info_str_at_span(&ctx.module.source, target_while.span, "the break escapes out of this loop")
                         .with_info_str_at_span(&ctx.module.source, sync_stmt.span, "And would therefore escape this synchronous block")
                 );
+            }
+        }
         Ok(target)
+    }
+}
@@ \ No newline at end of file @@

src/protocol/parser/symbol_table.rs

➞

Show inline comments

 /// symbol_table.rs
 ///
 /// The datastructure used to lookup symbols within particular scopes. Scopes
 /// may be module-level or definition level, although imports and definitions
 /// within definitions are currently not allowed.
 ///
 /// TODO: Once the compiler has matured, find out ways to optimize to prevent
 ///     the repeated HashMap lookup.
 use std::collections::HashMap;
 use std::collections::hash_map::Entry;
 use crate::protocol::input_source::*;
 use crate::protocol::ast::*;
 use crate::collections::*;
 const RESERVED_SYMBOLS: usize = 32;
 #[derive(Debug, Clone, Copy, Hash, PartialEq, Eq)]
 pub enum SymbolScope {
     Global,
     Module(RootId),
     Definition(DefinitionId),
+}
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum SymbolClass {
     Module,
     Struct,
     Enum,
     Union,
     Function,
     Component
+}
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum DefinitionClass {
     Struct,
     Enum,
     Union,
     Function,
     Component,
+}
 impl DefinitionClass {
     fn as_symbol_class(&self) -> SymbolClass {
         match self {
             DefinitionClass::Struct => SymbolClass::Struct,
             DefinitionClass::Enum => SymbolClass::Enum,
             DefinitionClass::Union => SymbolClass::Union,
             DefinitionClass::Function => SymbolClass::Function,
             DefinitionClass::Component => SymbolClass::Component,
+        }
+    }
+}
 struct ScopedSymbols {
     scope: SymbolScope,
     parent_scope: Option<SymbolScope>,
     child_scopes: Vec<SymbolScope>,
     symbols: Vec<Symbol>,
+}
 impl ScopedSymbols {
     fn get_symbol<'a>(&'a self, name: &StringRef) -> Option<&'a Symbol> {
         for symbol in self.symbols.iter() {
             if symbol.name == *name {
                 return Some(symbol);
+            }
+        }
         None
+    }
+}
 #[derive(Debug, Clone)]
 pub struct SymbolModule {
     pub root_id: RootId,
     pub introduced_at: ImportId,
+}
 #[derive(Debug, Clone)]
 pub struct SymbolDefinition {
     // Definition location (not necessarily the place where the symbol
     // is introduced, as it may be imported). Builtin symbols will have invalid
     // spans and module IDs
     pub defined_in_module: RootId,
     pub defined_in_scope: SymbolScope,
     pub definition_span: InputSpan, // full span of definition
     pub identifier_span: InputSpan, // span of just the identifier
     // Location where the symbol is introduced in its scope
     pub imported_at: Option<ImportId>,
     // Definition in the heap, with a utility enum to determine its
     // class if the ID is not needed.
     pub class: DefinitionClass,
     pub definition_id: DefinitionId,
+}
 impl SymbolDefinition {
     /// Clones the entire data structure, but replaces the `imported_at` field
     /// with the supplied `ImportId`.
     pub(crate) fn into_imported(mut self, imported_at: ImportId) -> Self {
         self.imported_at = Some(imported_at);
         self
+    }
+}
 #[derive(Debug, Clone)]
 pub enum SymbolVariant {
     Module(SymbolModule),
     Definition(SymbolDefinition),
+}
 impl SymbolVariant {
     /// Returns the span at which the item was introduced. For an imported
     /// item (all modules, and imported types) this returns the span of the
     /// import. For a defined type this returns the span of the identifier
     pub(crate) fn span_of_introduction(&self, heap: &Heap) -> InputSpan {
         match self {
             SymbolVariant::Module(v) => heap[v.introduced_at].span(),
             SymbolVariant::Definition(v) => if let Some(import_id) = v.imported_at {
                 heap[import_id].span()
             } else {
                 v.identifier_span
             },
+        }
+    }
     pub(crate) fn as_definition(&self) -> &SymbolDefinition {
         match self {
             SymbolVariant::Module(_) => unreachable!("called 'as_definition' on {:?}", self),
             SymbolVariant::Definition(v) => v,
+        }
+    }
+}
 /// TODO: @Cleanup - remove clone everywhere
 #[derive(Debug, Clone)]
 pub struct Symbol {
     pub name: StringRef<'static>,
     pub variant: SymbolVariant,
+}
 impl Symbol {
     pub(crate) fn class(&self) -> SymbolClass {
         match &self.variant {
             SymbolVariant::Module(_) => SymbolClass::Module,
             SymbolVariant::Definition(data) => data.class.as_symbol_class(),
+        }
+    }
+}
 pub struct SymbolTable {
     module_lookup: HashMap<StringRef<'static>, RootId>,
     scope_lookup: HashMap<SymbolScope, ScopedSymbols>,
+}
 impl SymbolTable {
     pub(crate) fn new() -> Self {
         Self{
             module_lookup: HashMap::new(),
             scope_lookup: HashMap::new(),
+        }
+    }
     /// Inserts a new module by its name. Upon module naming conflict the
     /// previously associated `RootId` will be returned.
     pub(crate) fn insert_module(&mut self, module_name: StringRef<'static>, root_id: RootId) -> Result<(), RootId> {
         match self.module_lookup.entry(module_name) {
             Entry::Occupied(v) => {
                 Err(*v.get())
             },
             Entry::Vacant(v) => {
                 v.insert(root_id);
                 Ok(())
+            }
+        }
+    }
     /// Retrieves module `RootId` by name
     pub(crate) fn get_module_by_name(&mut self, name: &[u8]) -> Option<RootId> {
         let string_ref = StringRef::new(name);
         self.module_lookup.get(&string_ref).map(|v| *v)
+    }
     /// Inserts a new symbol scope. The parent must have been added to the
     /// symbol table before.
     pub(crate) fn insert_scope(&mut self, parent_scope: Option<SymbolScope>, new_scope: SymbolScope) {
         debug_assert!(
             parent_scope.is_none() || self.scope_lookup.contains_key(parent_scope.as_ref().unwrap()),
             "inserting scope {:?} but parent {:?} does not exist", new_scope, parent_scope
         );
         debug_assert!(!self.scope_lookup.contains_key(&new_scope), "inserting scope {:?}, but it already exists", new_scope);
         println!("DEBUG: Inserting scope {:?} with parent {:?}", new_scope, parent_scope);
         if let Some(parent_scope) = parent_scope {
             let parent = self.scope_lookup.get_mut(&parent_scope).unwrap();
             parent.child_scopes.push(new_scope);
+        }
         let scope = ScopedSymbols {
             scope: new_scope,
             parent_scope,
             child_scopes: Vec::with_capacity(RESERVED_SYMBOLS),
             symbols: Vec::with_capacity(RESERVED_SYMBOLS)
         };
         self.scope_lookup.insert(new_scope, scope);
+    }
     /// Inserts a symbol into a particular scope. The symbol's name may not
     /// exist in the scope or any of its parents. If it does collide then the
     /// symbol will be returned, together with the symbol that has the same
     /// name.
     // Note: we do not return a reference because Rust doesn't like it.
     pub(crate) fn insert_symbol(&mut self, in_scope: SymbolScope, symbol: Symbol) -> Result<(), (Symbol, Symbol)> {
         debug_assert!(self.scope_lookup.contains_key(&in_scope), "inserting symbol {}, but scope {:?} does not exist", symbol.name.as_str(), in_scope);
         println!("DEBUG: Inserting symbol {:?} in scope {:?}", symbol, in_scope);
         let mut seek_scope = in_scope;
         loop {
             let scoped_symbols = self.scope_lookup.get(&seek_scope).unwrap();
             for existing_symbol in scoped_symbols.symbols.iter() {
                 if symbol.name == existing_symbol.name {
                     return Err((symbol, existing_symbol.clone()))
+                }
+            }
             match scoped_symbols.parent_scope {
                 Some(parent_scope) => { seek_scope = parent_scope; },
                 None => { break; }
+            }
+        }
         // If here, then there is no collision
         let scoped_symbols = self.scope_lookup.get_mut(&in_scope).unwrap();
         scoped_symbols.symbols.push(symbol);
         Ok(())
+    }
     /// Retrieves a symbol by name by searching in a particular scope and that scope's parents. The
     /// returned symbol may both be imported as defined within any of the searched scopes.
     pub(crate) fn get_symbol_by_name(
         &self, mut in_scope: SymbolScope, name: &[u8]
     ) -> Option<&Symbol> {
         let string_ref = StringRef::new(name);
         loop {
             let scope = self.scope_lookup.get(&in_scope);
             if scope.is_none() {
                 return None;
+            }
             let scope = scope.unwrap();
             if let Some(symbol) = scope.get_symbol(&string_ref) {
                 return Some(symbol);
             } else {
                 // Could not find symbol in current scope, seek in the parent scope if it exists
                 match &scope.parent_scope {
                     Some(parent_scope) => { in_scope = *parent_scope; },
                     None => return None,
+                }
+            }
+        }
+    }
     /// Retrieves a symbol by name by searching in a particular scope and that scope's parents. The
     /// returned symbol must be defined within any of the searched scopes and may not be imported.
     /// In case such an imported symbol exists then this function still returns `None`.
     pub(crate) fn get_symbol_by_name_defined_in_scope(
         &self, in_scope: SymbolScope, name: &[u8]
     ) -> Option<&Symbol> {
         match self.get_symbol_by_name(in_scope, name) {
             Some(symbol) => {
                 match &symbol.variant {
                     SymbolVariant::Module(_) => {
                         None // in-scope modules are always imported
                     },
                     SymbolVariant::Definition(variant) => {
                         if variant.imported_at.is_some() || variant.defined_in_scope == SymbolScope::Global {
                             // Symbol is imported or lives in the global scope.
                             // Things in the global scope are defined by the
                             // compiler.
                             None
                         } else {
                             Some(symbol)
+                        }
+                    }
+                }
             },
             None => None,
+        }
+    }
     /// Retrieves all symbols that are defined within a particular scope. Imported symbols are
     /// ignored. Returns `true` if the scope was found (which may contain 0 defined symbols) and
     /// `false` if the scope was not found.
     pub(crate) fn get_all_symbols_defined_in_scope(&self, in_scope: SymbolScope, target: &mut Vec<Symbol>) -> bool {
         match self.scope_lookup.get(&in_scope) {
             Some(scope) => {
                 for symbol in &scope.symbols {
                     if let SymbolVariant::Definition(definition) = &symbol.variant {
                         if definition.imported_at.is_some() {
                             continue;
+                        }
                         // Defined in scope, so push onto target
                         target.push(symbol.clone());
+                    }
+                }
                 true
             },
             None => false,
+        }
+    }
+}
@@ \ No newline at end of file @@

src/protocol/parser/token_parsing.rs

➞

Show inline comments

 use crate::collections::ScopedSection;
 use crate::protocol::ast::*;
 use crate::protocol::input_source::{
     InputSource as InputSource,
     InputPosition as InputPosition,
     InputSpan,
     ParseError,
 };
 use super::tokens::*;
 use super::symbol_table::*;
 use super::{Module, PassCtx};
 // Keywords
 pub(crate) const KW_LET:       &'static [u8] = b"let";
 pub(crate) const KW_AS:        &'static [u8] = b"as";
 pub(crate) const KW_STRUCT:    &'static [u8] = b"struct";
 pub(crate) const KW_ENUM:      &'static [u8] = b"enum";
 pub(crate) const KW_UNION:     &'static [u8] = b"union";
 pub(crate) const KW_FUNCTION:  &'static [u8] = b"func";
 pub(crate) const KW_PRIMITIVE: &'static [u8] = b"primitive";
 pub(crate) const KW_COMPOSITE: &'static [u8] = b"composite";
 pub(crate) const KW_IMPORT:    &'static [u8] = b"import";
 // Keywords - literals
 pub(crate) const KW_LIT_TRUE:  &'static [u8] = b"true";
 pub(crate) const KW_LIT_FALSE: &'static [u8] = b"false";
 pub(crate) const KW_LIT_NULL:  &'static [u8] = b"null";
 // Keywords - functions
 pub(crate) const KW_FUNC_GET:    &'static [u8] = b"get";
 pub(crate) const KW_FUNC_PUT:    &'static [u8] = b"put";
 pub(crate) const KW_FUNC_FIRES:  &'static [u8] = b"fires";
 pub(crate) const KW_FUNC_CREATE: &'static [u8] = b"create";
 pub(crate) const KW_FUNC_LENGTH: &'static [u8] = b"length";
 pub(crate) const KW_FUNC_ASSERT: &'static [u8] = b"assert";
 // Keywords - statements
 pub(crate) const KW_STMT_CHANNEL:  &'static [u8] = b"channel";
 pub(crate) const KW_STMT_IF:       &'static [u8] = b"if";
 pub(crate) const KW_STMT_ELSE:     &'static [u8] = b"else";
 pub(crate) const KW_STMT_WHILE:    &'static [u8] = b"while";
 pub(crate) const KW_STMT_BREAK:    &'static [u8] = b"break";
 pub(crate) const KW_STMT_CONTINUE: &'static [u8] = b"continue";
 pub(crate) const KW_STMT_GOTO:     &'static [u8] = b"goto";
 pub(crate) const KW_STMT_RETURN:   &'static [u8] = b"return";
 pub(crate) const KW_STMT_SYNC:     &'static [u8] = b"synchronous";
 pub(crate) const KW_STMT_NEW:      &'static [u8] = b"new";
 // Keywords - types
 // Since types are needed for returning diagnostic information to the user, the
 // string variants are put here as well.
 pub(crate) const KW_TYPE_IN_PORT_STR:  &'static str = "in";
 pub(crate) const KW_TYPE_OUT_PORT_STR: &'static str = "out";
 pub(crate) const KW_TYPE_MESSAGE_STR:  &'static str = "msg";
 pub(crate) const KW_TYPE_BOOL_STR:     &'static str = "bool";
 pub(crate) const KW_TYPE_UINT8_STR:    &'static str = "u8";
 pub(crate) const KW_TYPE_UINT16_STR:   &'static str = "u16";
 pub(crate) const KW_TYPE_UINT32_STR:   &'static str = "u32";
 pub(crate) const KW_TYPE_UINT64_STR:   &'static str = "u64";
 pub(crate) const KW_TYPE_SINT8_STR:    &'static str = "s8";
 pub(crate) const KW_TYPE_SINT16_STR:   &'static str = "s16";
 pub(crate) const KW_TYPE_SINT32_STR:   &'static str = "s32";
 pub(crate) const KW_TYPE_SINT64_STR:   &'static str = "s64";
 pub(crate) const KW_TYPE_CHAR_STR:     &'static str = "char";
 pub(crate) const KW_TYPE_STRING_STR:   &'static str = "string";
 pub(crate) const KW_TYPE_INFERRED_STR: &'static str = "auto";
 pub(crate) const KW_TYPE_IN_PORT:  &'static [u8] = KW_TYPE_IN_PORT_STR.as_bytes();
 pub(crate) const KW_TYPE_OUT_PORT: &'static [u8] = KW_TYPE_OUT_PORT_STR.as_bytes();
 pub(crate) const KW_TYPE_MESSAGE:  &'static [u8] = KW_TYPE_MESSAGE_STR.as_bytes();
 pub(crate) const KW_TYPE_BOOL:     &'static [u8] = KW_TYPE_BOOL_STR.as_bytes();
 pub(crate) const KW_TYPE_UINT8:    &'static [u8] = KW_TYPE_UINT8_STR.as_bytes();
 pub(crate) const KW_TYPE_UINT16:   &'static [u8] = KW_TYPE_UINT16_STR.as_bytes();
 pub(crate) const KW_TYPE_UINT32:   &'static [u8] = KW_TYPE_UINT32_STR.as_bytes();
 pub(crate) const KW_TYPE_UINT64:   &'static [u8] = KW_TYPE_UINT64_STR.as_bytes();
 pub(crate) const KW_TYPE_SINT8:    &'static [u8] = KW_TYPE_SINT8_STR.as_bytes();
 pub(crate) const KW_TYPE_SINT16:   &'static [u8] = KW_TYPE_SINT16_STR.as_bytes();
 pub(crate) const KW_TYPE_SINT32:   &'static [u8] = KW_TYPE_SINT32_STR.as_bytes();
 pub(crate) const KW_TYPE_SINT64:   &'static [u8] = KW_TYPE_SINT64_STR.as_bytes();
 pub(crate) const KW_TYPE_CHAR:     &'static [u8] = KW_TYPE_CHAR_STR.as_bytes();
 pub(crate) const KW_TYPE_STRING:   &'static [u8] = KW_TYPE_STRING_STR.as_bytes();
 pub(crate) const KW_TYPE_INFERRED: &'static [u8] = KW_TYPE_INFERRED_STR.as_bytes();
 /// A special trait for when consuming comma-separated things such that we can
 /// push them onto a `Vec` and onto a `ScopedSection`. As we monomorph for
 /// very specific comma-separated cases I don't expect polymorph bloat.
 /// Also, I really don't like this solution.
 pub(crate) trait Extendable {
     type Value;
     fn push(&mut self, v: Self::Value);
+}
 impl<T> Extendable for Vec<T> {
     type Value = T;
     #[inline]
     fn push(&mut self, v: Self::Value) {
         (self as &mut Vec<T>).push(v);
+    }
+}
 impl<T: Sized> Extendable for ScopedSection<T> {
     type Value = T;
     #[inline]
     fn push(&mut self, v: Self::Value) {
         (self as &mut ScopedSection<T>).push(v);
+    }
+}
 /// Consumes a domain-name identifier: identifiers separated by a dot. For
 /// simplification of later parsing and span identification the domain-name may
 /// contain whitespace, but must reside on the same line.
 pub(crate) fn consume_domain_ident<'a>(
     source: &'a InputSource, iter: &mut TokenIter
 ) -> Result<(&'a [u8], InputSpan), ParseError> {
     let (_, mut span) = consume_ident(source, iter)?;
     while let Some(TokenKind::Dot) = iter.next() {
         iter.consume();
         let (_, new_span) = consume_ident(source, iter)?;
         span.end = new_span.end;
+    }
     // Not strictly necessary, but probably a reasonable restriction: this
     // simplifies parsing of module naming and imports.
     if span.begin.line != span.end.line {
         return Err(ParseError::new_error_str_at_span(source, span, "module names may not span multiple lines"));
+    }
     // If module name consists of a single identifier, then it may not match any
     // of the reserved keywords
     let section = source.section_at_pos(span.begin, span.end);
     if is_reserved_keyword(section) {
         return Err(ParseError::new_error_str_at_span(source, span, "encountered reserved keyword"));
+    }
     Ok((source.section_at_pos(span.begin, span.end), span))
+}
 /// Consumes a specific expected token. Be careful to only call this with tokens
 /// that do not have a variable length.
 pub(crate) fn consume_token(source: &InputSource, iter: &mut TokenIter, expected: TokenKind) -> Result<InputSpan, ParseError> {
     if Some(expected) != iter.next() {
         return Err(ParseError::new_error_at_pos(
             source, iter.last_valid_pos(),
             format!("expected '{}'", expected.token_chars())
         ));
+    }
     let span = iter.next_span();
     iter.consume();
     Ok(span)
+}
 /// Consumes a comma separated list until the closing delimiter is encountered
 pub(crate) fn consume_comma_separated_until<T, F, E>(
     close_delim: TokenKind, source: &InputSource, iter: &mut TokenIter, ctx: &mut PassCtx,
     mut consumer_fn: F, target: &mut E, item_name_and_article: &'static str,
     close_pos: Option<&mut InputPosition>
 ) -> Result<(), ParseError>
     where F: FnMut(&InputSource, &mut TokenIter, &mut PassCtx) -> Result<T, ParseError>,
           E: Extendable<Value=T>
+{
     let mut had_comma = true;
     let mut next;
     loop {
         next = iter.next();
         if Some(close_delim) == next {
             if let Some(close_pos) = close_pos {
                 // If requested return the position of the closing delimiter
                 let (_, new_close_pos) = iter.next_positions();
                 *close_pos = new_close_pos;
+            }
             iter.consume();
             break;
         } else if !had_comma || next.is_none() {
             return Err(ParseError::new_error_at_pos(
                 source, iter.last_valid_pos(),
                 format!("expected a '{}', or {}", close_delim.token_chars(), item_name_and_article)
             ));
+        }
         let new_item = consumer_fn(source, iter, ctx)?;
         target.push(new_item);
         next = iter.next();
         had_comma = next == Some(TokenKind::Comma);
         if had_comma {
             iter.consume();
+        }
+    }
     Ok(())
+}
 /// Consumes a comma-separated list of items if the opening delimiting token is
 /// encountered. If not, then the iterator will remain at its current position.
 /// Note that the potential cases may be:
 /// - No opening delimiter encountered, then we return `false`.
 /// - Both opening and closing delimiter encountered, but no items.
 /// - Opening and closing delimiter encountered, and items were processed.
 /// - Found an opening delimiter, but processing an item failed.
 pub(crate) fn maybe_consume_comma_separated<T, F, E>(
     open_delim: TokenKind, close_delim: TokenKind, source: &InputSource, iter: &mut TokenIter, ctx: &mut PassCtx,
     consumer_fn: F, target: &mut E, item_name_and_article: &'static str,
     close_pos: Option<&mut InputPosition>
 ) -> Result<bool, ParseError>
     where F: FnMut(&InputSource, &mut TokenIter, &mut PassCtx) -> Result<T, ParseError>,
           E: Extendable<Value=T>
+{
     if Some(open_delim) != iter.next() {
         return Ok(false);
+    }
     // Opening delimiter encountered, so must parse the comma-separated list.
     iter.consume();
     consume_comma_separated_until(close_delim, source, iter, ctx, consumer_fn, target, item_name_and_article, close_pos)?;
     Ok(true)
+}
 pub(crate) fn maybe_consume_comma_separated_spilled<F: FnMut(&InputSource, &mut TokenIter, &mut PassCtx) -> Result<(), ParseError>>(
     open_delim: TokenKind, close_delim: TokenKind, source: &InputSource,
     iter: &mut TokenIter, ctx: &mut PassCtx,
     mut consumer_fn: F, item_name_and_article: &'static str
 ) -> Result<bool, ParseError> {
     let mut next = iter.next();
     if Some(open_delim) != next {
         return Ok(false);
+    }
     iter.consume();
     let mut had_comma = true;
     loop {
         next = iter.next();
         if Some(close_delim) == next {
             iter.consume();
             break;
         } else if !had_comma {
             return Err(ParseError::new_error_at_pos(
                 source, iter.last_valid_pos(),
                 format!("expected a '{}', or {}", close_delim.token_chars(), item_name_and_article)
             ));
+        }
         consumer_fn(source, iter, ctx)?;
         next = iter.next();
         had_comma = next == Some(TokenKind::Comma);
         if had_comma {
             iter.consume();
+        }
+    }
     Ok(true)
+}
 /// Consumes a comma-separated list and expected the opening and closing
 /// characters to be present. The returned array may still be empty
 pub(crate) fn consume_comma_separated<T, F, E>(
     open_delim: TokenKind, close_delim: TokenKind, source: &InputSource,
     iter: &mut TokenIter, ctx: &mut PassCtx,
     consumer_fn: F, target: &mut E, item_name_and_article: &'static str,
     list_name_and_article: &'static str, close_pos: Option<&mut InputPosition>
 ) -> Result<(), ParseError>
     where F: FnMut(&InputSource, &mut TokenIter, &mut PassCtx) -> Result<T, ParseError>,
           E: Extendable<Value=T>
+{
     let first_pos = iter.last_valid_pos();
     match maybe_consume_comma_separated(
         open_delim, close_delim, source, iter, ctx, consumer_fn, target,
         item_name_and_article, close_pos
     ) {
         Ok(true) => Ok(()),
         Ok(false) => {
             return Err(ParseError::new_error_at_pos(
                 source, first_pos,
                 format!("expected {}", list_name_and_article)
             ));
         },
         Err(err) => Err(err)
+    }
+}
 /// Consumes an integer literal, may be binary, octal, hexadecimal or decimal,
 /// and may have separating '_'-characters.
 /// TODO: @Cleanup, @Performance
 pub(crate) fn consume_integer_literal(source: &InputSource, iter: &mut TokenIter, buffer: &mut String) -> Result<(u64, InputSpan), ParseError> {
     if Some(TokenKind::Integer) != iter.next() {
         return Err(ParseError::new_error_str_at_pos(source, iter.last_valid_pos(), "expected an integer literal"));
+    }
     let integer_span = iter.next_span();
     iter.consume();
     let integer_text = source.section_at_span(integer_span);
     // Determine radix and offset from prefix
     let (radix, input_offset, radix_name) =
         if integer_text.starts_with(b"0b") || integer_text.starts_with(b"0B") {
             // Binary number
             (2, 2, "binary")
         } else if integer_text.starts_with(b"0o") || integer_text.starts_with(b"0O") {
             // Octal number
             (8, 2, "octal")
         } else if integer_text.starts_with(b"0x") || integer_text.starts_with(b"0X") {
             // Hexadecimal number
             (16, 2, "hexadecimal")
         } else {
             (10, 0, "decimal")
         };
     // Take out any of the separating '_' characters
     buffer.clear();
     for char_idx in input_offset..integer_text.len() {
         let char = integer_text[char_idx];
         if char == b'_' {
             continue;
+        }
         if !char.is_ascii_digit() {
         if !((char >= b'0' && char <= b'9') || (char >= b'A' && char <= b'F') || (char >= b'a' || char <= b'f')) {
             return Err(ParseError::new_error_at_span(
                 source, integer_span,
                 format!("incorrectly formatted {} number", radix_name)
             ));
+        }
         buffer.push(char::from(char));
+    }
     // Use the cleaned up string to convert to integer
     match u64::from_str_radix(&buffer, radix) {
         Ok(number) => Ok((number, integer_span)),
         Err(_) => Err(ParseError::new_error_at_span(
             source, integer_span,
             format!("incorrectly formatted {} number", radix_name)
         )),
+    }
+}
 /// Consumes a character literal. We currently support a limited number of
 /// backslash-escaped characters
 pub(crate) fn consume_character_literal(
     source: &InputSource, iter: &mut TokenIter
 ) -> Result<(char, InputSpan), ParseError> {
     if Some(TokenKind::Character) != iter.next() {
         return Err(ParseError::new_error_str_at_pos(source, iter.last_valid_pos(), "expected a character literal"));
+    }
     let span = iter.next_span();
     iter.consume();
     let char_text = source.section_at_span(span);
     if !char_text.is_ascii() {
         return Err(ParseError::new_error_str_at_span(
             source, span, "expected an ASCII character literal"
         ));
+    }
     match char_text.len() {
 => return Err(ParseError::new_error_str_at_span(source, span, "too little characters in character literal")),
 => {
             // We already know the text is ascii, so just throw an error if we have the escape
             // character.
             if char_text[0] == b'\\' {
                 return Err(ParseError::new_error_str_at_span(source, span, "escape character without subsequent character"));
+            }
             return Ok((char_text[0] as char, span));
         },
 => {
             if char_text[0] == b'\\' {
                 let result = parse_escaped_character(source, iter.last_valid_pos(), char_text[1])?;
                 return Ok((result, span))
+            }
         },
         _ => {}
+    }
     return Err(ParseError::new_error_str_at_span(source, span, "too many characters in character literal"))
+}
 /// Consumes a string literal. We currently support a limited number of
 /// backslash-escaped characters. Note that the result is stored in the
 /// buffer.
 pub(crate) fn consume_string_literal(
     source: &InputSource, iter: &mut TokenIter, buffer: &mut String
 ) -> Result<InputSpan, ParseError> {
     if Some(TokenKind::String) != iter.next() {
         return Err(ParseError::new_error_str_at_pos(source, iter.last_valid_pos(), "expected a string literal"));
+    }
     buffer.clear();
     let span = iter.next_span();
     iter.consume();
     let text = source.section_at_span(span);
     if !text.is_ascii() {
         return Err(ParseError::new_error_str_at_span(source, span, "expected an ASCII string literal"));
+    }
     buffer.reserve(text.len());
     let mut was_escape = false;
     for idx in 0..text.len() {
         let cur = text[idx];
         if cur != b'\\' {
             if was_escape {
                 let to_push = parse_escaped_character(source, iter.last_valid_pos(), cur)?;
                 buffer.push(to_push);
             } else {
                 buffer.push(cur as char);
+            }
             was_escape = false;
         } else {
             was_escape = true;
+        }
+    }
     debug_assert!(!was_escape); // because otherwise we couldn't have ended the string literal
     Ok(span)
+}
 fn parse_escaped_character(source: &InputSource, pos: InputPosition, v: u8) -> Result<char, ParseError> {
     let result = match v {
         b'r' => '\r',
         b'n' => '\n',
         b't' => '\t',
         b'0' => '\0',
         b'\\' => '\\',
         b'\'' => '\'',
         b'"' => '"',
         v => return Err(ParseError::new_error_at_pos(
             source, pos, format!("unexpected escaped character '{}'", v)
         )),
     };
     Ok(result)
+}
 pub(crate) fn consume_pragma<'a>(source: &'a InputSource, iter: &mut TokenIter) -> Result<(&'a [u8], InputPosition, InputPosition), ParseError> {
     if Some(TokenKind::Pragma) != iter.next() {
         return Err(ParseError::new_error_str_at_pos(source, iter.last_valid_pos(), "expected a pragma"));
+    }
     let (pragma_start, pragma_end) = iter.next_positions();
     iter.consume();
     Ok((source.section_at_pos(pragma_start, pragma_end), pragma_start, pragma_end))
+}
 pub(crate) fn has_ident(source: &InputSource, iter: &mut TokenIter, expected: &[u8]) -> bool {
     peek_ident(source, iter).map_or(false, |section| section == expected)
+}
 pub(crate) fn peek_ident<'a>(source: &'a InputSource, iter: &mut TokenIter) -> Option<&'a [u8]> {
     if Some(TokenKind::Ident) == iter.next() {
         let (start, end) = iter.next_positions();
         return Some(source.section_at_pos(start, end))
+    }
     None
+}
 /// Consumes any identifier and returns it together with its span. Does not
 /// check if the identifier is a reserved keyword.
 pub(crate) fn consume_any_ident<'a>(
     source: &'a InputSource, iter: &mut TokenIter
 ) -> Result<(&'a [u8], InputSpan), ParseError> {
     if Some(TokenKind::Ident) != iter.next() {
         return Err(ParseError::new_error_str_at_pos(source, iter.last_valid_pos(), "expected an identifier"));
+    }
     let (ident_start, ident_end) = iter.next_positions();
     iter.consume();
     Ok((source.section_at_pos(ident_start, ident_end), InputSpan::from_positions(ident_start, ident_end)))
+}
 /// Consumes a specific identifier. May or may not be a reserved keyword.
 pub(crate) fn consume_exact_ident(source: &InputSource, iter: &mut TokenIter, expected: &[u8]) -> Result<InputSpan, ParseError> {
     let (ident, pos) = consume_any_ident(source, iter)?;
     if ident != expected {
         debug_assert!(expected.is_ascii());
         return Err(ParseError::new_error_at_pos(
             source, iter.last_valid_pos(),
             format!("expected the text '{}'", &String::from_utf8_lossy(expected))
         ));
+    }
     Ok(pos)
+}
 /// Consumes an identifier that is not a reserved keyword and returns it
 /// together with its span.
 pub(crate) fn consume_ident<'a>(
     source: &'a InputSource, iter: &mut TokenIter
 ) -> Result<(&'a [u8], InputSpan), ParseError> {
     let (ident, span) = consume_any_ident(source, iter)?;
     if is_reserved_keyword(ident) {
         return Err(ParseError::new_error_str_at_span(source, span, "encountered reserved keyword"));
+    }
     Ok((ident, span))
+}
 /// Consumes an identifier and immediately intern it into the `StringPool`
 pub(crate) fn consume_ident_interned(
     source: &InputSource, iter: &mut TokenIter, ctx: &mut PassCtx
 ) -> Result<Identifier, ParseError> {
     let (value, span) = consume_ident(source, iter)?;
     let value = ctx.pool.intern(value);
     Ok(Identifier{ span, value })
+}
 fn is_reserved_definition_keyword(text: &[u8]) -> bool {
     match text {
         KW_STRUCT | KW_ENUM | KW_UNION | KW_FUNCTION | KW_PRIMITIVE | KW_COMPOSITE => true,
         _ => false,
+    }
+}
 fn is_reserved_statement_keyword(text: &[u8]) -> bool {
     match text {
         KW_IMPORT | KW_AS |
         KW_STMT_CHANNEL | KW_STMT_IF | KW_STMT_WHILE |
         KW_STMT_BREAK | KW_STMT_CONTINUE | KW_STMT_GOTO | KW_STMT_RETURN |
         KW_STMT_SYNC | KW_STMT_NEW => true,
         _ => false,
+    }
+}
 fn is_reserved_expression_keyword(text: &[u8]) -> bool {
     match text {
         KW_LET |
         KW_LIT_TRUE | KW_LIT_FALSE | KW_LIT_NULL |
         KW_FUNC_GET | KW_FUNC_PUT | KW_FUNC_FIRES | KW_FUNC_CREATE | KW_FUNC_ASSERT | KW_FUNC_LENGTH => true,
         _ => false,
+    }
+}
 fn is_reserved_type_keyword(text: &[u8]) -> bool {
     match text {
         KW_TYPE_IN_PORT | KW_TYPE_OUT_PORT | KW_TYPE_MESSAGE | KW_TYPE_BOOL |
         KW_TYPE_UINT8 | KW_TYPE_UINT16 | KW_TYPE_UINT32 | KW_TYPE_UINT64 |
         KW_TYPE_SINT8 | KW_TYPE_SINT16 | KW_TYPE_SINT32 | KW_TYPE_SINT64 |
         KW_TYPE_CHAR | KW_TYPE_STRING |
         KW_TYPE_INFERRED => true,
         _ => false,
+    }
+}
 fn is_reserved_keyword(text: &[u8]) -> bool {
     return
         is_reserved_definition_keyword(text) ||
         is_reserved_statement_keyword(text) ||
         is_reserved_expression_keyword(text) ||
         is_reserved_type_keyword(text);
+}
 pub(crate) fn seek_module(modules: &[Module], root_id: RootId) -> Option<&Module> {
     for module in modules {
         if module.root_id == root_id {
             return Some(module)
+        }
+    }
     return None
+}
 /// Constructs a human-readable message indicating why there is a conflict of
 /// symbols.
 // Note: passing the `module_idx` is not strictly necessary, but will prevent
 // programmer mistakes during development: we get a conflict because we're
 // currently parsing a particular module.
 pub(crate) fn construct_symbol_conflict_error(
     modules: &[Module], module_idx: usize, ctx: &PassCtx, new_symbol: &Symbol, old_symbol: &Symbol
 ) -> ParseError {
     let module = &modules[module_idx];
     let get_symbol_span_and_msg = |symbol: &Symbol| -> (String, Option<InputSpan>) {
         match &symbol.variant {
             SymbolVariant::Module(module) => {
                 let import = &ctx.heap[module.introduced_at];
                 return (
                     format!("the module aliased as '{}' imported here", symbol.name.as_str()),
                     Some(import.as_module().span)
                 );
             },
             SymbolVariant::Definition(definition) => {
                 if definition.defined_in_module.is_invalid() {
                     // Must be a builtin thing
                     return (format!("the builtin '{}'", symbol.name.as_str()), None)
                 } else {
                     if let Some(import_id) = definition.imported_at {
                         let import = &ctx.heap[import_id];
                         return (
                             format!("the type '{}' imported here", symbol.name.as_str()),
                             Some(import.as_symbols().span)
                         );
                     } else {
                         // This is a defined symbol. So this must mean that the
                         // error was caused by it being defined.
                         debug_assert_eq!(definition.defined_in_module, module.root_id);
                         return (
                             format!("the type '{}' defined here", symbol.name.as_str()),
                             Some(definition.identifier_span)
+                        )
+                    }
+                }
+            }
+        }
     };
     let (new_symbol_msg, new_symbol_span) = get_symbol_span_and_msg(new_symbol);
     let (old_symbol_msg, old_symbol_span) = get_symbol_span_and_msg(old_symbol);
     let new_symbol_span = new_symbol_span.unwrap(); // because new symbols cannot be builtin
     match old_symbol_span {
         Some(old_symbol_span) => ParseError::new_error_at_span(
             &module.source, new_symbol_span, format!("symbol is defined twice: {}", new_symbol_msg)
         ).with_info_at_span(
             &module.source, old_symbol_span, format!("it conflicts with {}", old_symbol_msg)
         ),
         None => ParseError::new_error_at_span(
             &module.source, new_symbol_span,
             format!("symbol is defined twice: {} conflicts with {}", new_symbol_msg, old_symbol_msg)
+        )
+    }
+}
@@ \ No newline at end of file @@

src/protocol/tests/parser_imports.rs

➞

Show inline comments

 /// parser_imports.rs
 ///
 /// Simple import tests
 use super::*;
 #[test]
 fn test_module_import() {
     Tester::new("single domain name")
         .with_source("
         #module external
         struct Foo { s32 field }
         ")
         .with_source("
         import external;
-        s32 caller() {
+        func caller() -> s32 {
             auto a = external::Foo{ field: 0 };
             return a.field;
+        }
         ")
         .compile()
         .expect_ok();
     Tester::new("multi domain name")
         .with_source("
         #module external.domain
         struct Foo { s32 field }
         ")
         .with_source("
         import external.domain;
-        s32 caller() {
+        func caller() -> s32 {
             auto a = domain::Foo{ field: 0 };
             return a.field;
+        }
         ")
         .compile()
         .expect_ok();
     Tester::new("aliased domain name")
         .with_source("
         #module external
         struct Foo { s32 field }
         ")
         .with_source("
         import external as aliased;
-        s32 caller() {
+        func caller() -> s32 {
             auto a = aliased::Foo{ field: 0 };
             return a.field;
+        }
         ")
         .compile()
         .expect_ok();
+}
 #[test]
 fn test_single_symbol_import() {
     Tester::new("specific symbol")
         .with_source("
         #module external
         struct Foo { s32 field }
         ")
         .with_source("
         import external::Foo;
-        s32 caller() {
+        func caller() -> s32 {
             auto a = Foo{ field: 1 };
             auto b = Foo{ field: 2 };
             return a.field + b.field;
         }")
         .compile()
         .expect_ok();
     Tester::new("specific aliased symbol")
         .with_source("
         #module external
         struct Foo { s32 field }
         ")
         .with_source("
         import external::Foo as Bar;
-        s32 caller() {
+        func caller() -> s32 {
             return Bar{ field: 0 }.field;
+        }
         ")
         .compile()
         .expect_ok();
     // TODO: Re-enable once std lib is properly implemented
     // Tester::new("import all")
     //     .with_source("
     //     #module external
     //     struct Foo { s32 field }
     //     ")
     //     .with_source("
     //     import external::*;
     //     s32 caller() { return Foo{field:0}.field; }
     //     ")
     //     .compile()
     //     .expect_ok();
+}
 #[test]
 fn test_multi_symbol_import() {
     Tester::new("specific symbols")
         .with_source("
         #module external
         struct Foo { s8 f }
         struct Bar { s8 b }
         ")
         .with_source("
         import external::{Foo, Bar};
-        s8 caller() {
+        func caller() -> s8 {
             return Foo{f:0}.f + Bar{b:1}.b;
+        }
         ")
         .compile()
         .expect_ok();
     Tester::new("aliased symbols")
         .with_source("
         #module external
         struct Foo { s8 in_foo }
         struct Bar { s8 in_bar }
         ")
         .with_source("
         import external::{Foo as Bar, Bar as Foo};
-        s8 caller() {
+        func caller() -> s8 {
             return Foo{in_bar:0}.in_bar + Bar{in_foo:0}.in_foo;
         }")
         .compile()
         .expect_ok();
     // TODO: Re-enable once std lib is properly implemented
     // Tester::new("import all")
     //     .with_source("
     //     #module external
     //     struct Foo { s8 f };
     //     struct Bar { s8 b };
     //     ")
     //     .with_source("
     //     import external::*;
     //     s8 caller() {
     //         auto f = Foo{f:0};
     //         auto b = Bar{b:0};
     //         return f.f + b.b;
     //     }
     //     ")
     //     .compile()
     //     .expect_ok();
     Tester::new("import all")
         .with_source("
         #module external
         struct Foo { s8 f }
         struct Bar { s8 b }
         ")
         .with_source("
         import external::*;
         func caller() -> s8 {
             auto f = Foo{f:0};
             auto b = Bar{b:0};
             return f.f + b.b;
+        }
         ")
         .compile()
         .expect_ok();
+}
 #[test]
 fn test_illegal_import_use() {
     Tester::new("unexpected polymorphic args")
         .with_source("
         #module external
         struct Foo { s8 f }
         ")
         .with_source("
         import external;
-        s8 caller() {
+        func caller() -> s8 {
             auto foo = external::Foo<s32>{ f: 0 };
             return foo.f;
+        }
         ")
         .compile()
         .expect_err()
         .error(|e| { e
             .assert_msg_has(0, "the type Foo is not polymorphic");
+            .assert_msg_has(0, "the type 'external::Foo' is not polymorphic");
         });
     Tester::new("mismatched polymorphic args")
         .with_source("
         #module external
         struct Foo<T>{ T f }
         ")
         .with_source("
         import external;
-        s8 caller() {
+        func caller() -> s8 {
             auto foo = external::Foo<s8, s32>{ f: 0 };
             return foo.f;
         }")
         .compile()
         .expect_err()
         .error(|e| { e
             .assert_msg_has(0, "expected 1 polymorphic")
-            .assert_msg_has(0, "2 were specified");
+            .assert_msg_has(0, "2 were provided");
         });
     Tester::new("module as type")
         .with_source("
         #module external
         ")
         .with_source("
         import external;
-        s8 caller() {
+        func caller() -> s8 {
             auto foo = external{ f: 0 };
             return 0;
+        }
         ")
         .compile()
         .expect_err()
         .error(|e| { e
-            .assert_msg_has(0, "resolved to a namespace");
+            .assert_msg_has(0, "expected a type but got a module");
         });
-    Tester::new("more namespaces than needed, not polymorphic")
+    Tester::new("missing type")
         .with_source("
         #module external
-        struct Foo { s8 f }
+        struct Bar {}
         ")
         .with_source("
         import external;
         s8 caller() {
             auto foo = external::Foo::f{ f: 0 };
             return 0;
         }")
         import external::Foo;
         ")
         .compile()
         .expect_err()
         .error(|e| { e
             .assert_msg_has(0, "not fully resolve this identifier")
             .assert_msg_has(0, "able to match 'external::Foo'");
             .assert_msg_has(0, "could not find symbol 'Foo' within module 'external'")
             .assert_occurs_at(0, "Foo");
         });
     Tester::new("import from another import")
         .with_source("
         #module mod1
         struct Foo { s8 f }
         ")
         .with_source("
         #module mod2
         import mod1::Foo;
         struct Bar { Foo f }
         ")
         .with_source("
         import mod2;
-        s8 caller() {
+        func caller() -> s8 {
             auto bar = mod2::Bar{ f: mod2::Foo{ f: 0 } };
             return var.f.f;
         }")
         .compile()
         .expect_err()
         .error(|e| { e
             .assert_msg_has(0, "Could not resolve this identifier")
             .assert_occurs_at(0, "mod2::Foo");
             .assert_msg_has(0, "unknown type 'Foo' in module 'mod2'")
             .assert_msg_has(0, "module 'mod2' does import 'Foo'")
             .assert_occurs_at(0, "Foo");
         });
+}
@@ \ No newline at end of file @@

Changeset was too big and was cut off... Show full diff anyway

0 comments (0 inline, 0 general)