CSY/reowolf Files · testdata/parser/positive/6.pdl · Centrum Wiskunde & Informatica (CWI)

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Initial casting implementation

Explicit casts can be performed with the syntax 'cast<type>(input)'
and implicit casts can be performed with the syntax 'cast(input)'
where the output type is determined by inference.

To prevent casting shenanigans we only allow casting of primitive
types and of types to themselves (essentially creating a copy).

#version 100

composite main(in a1, in a2, in a3, out b1, out b2) {
	new reonode({a1, a2, a3}, {b1, b2});
}

composite reonode(in[] a, out[] b) {
	channel co -> ci;
	new merger(a, co);
	new replicator(ci, b);
}

composite replicator(in a, out[] b) {
	if (b.length == 0) {
		new blocking(a);
	} else if (b.length == 1) {
		new sync(a, b[0]);
	} else {
		channel xo -> xi;
		new binary_replicator(a, b[0], xo);
		new replicator(xi, b[1 : b.length - 1]);
	}
}
primitive binary_replicator(in a, out b, out c) {
    while (true) {
        synchronous {
            if (fires(a) && fires(b) && fires(c)) {
                msg x = get(a);
                put(b, x);
                put(c, x);
            } else {
                assert !fires(a) && !fires(b) && !fires(c);
            }
        }
    }
}
primitive blocking(in a) {
	while (true) synchronous {
		assert !fires(a);
	}
}

composite merger(in[] a, out b) {
	if (a.length == 0) {
		new silent(b);
	} else {
		in prev = a[0];
		int i = 1;
		while (i < a.length) {
			channel yi -> yo;
			new binary_merger(prev, a[i], yo);
			prev = yi;
			i++;
		}
		new sync(prev, b);
	}
}
primitive binary_merger(in a, in b, out c) {
    while (true) {
        synchronous {
            if (fires(a) && fires(c)) {
                assert !fires(b);
                put(c, get(a));
            } else if (fires(b) && fires(c)) {
                assert !fires(a);
                put(c, get(b));
            } else {
                assert !fires(a) && !fires(b) && !fires(c);
            }
        }
    }
}
primitive silent(out a) {
	while (true) synchronous {
		assert !fires(a);
	}
}

primitive sync(in a, out b) {
    while (true) {
        synchronous {
            if (fires(a) && fires(b)) {
            	put(b, get(a));
            } else {
                assert !fires(a) && !fires(b);
            }
        }
    }
}