/**
* A filter for the sequence </br> Combines the sequential type and method declarations into a
* block </br>
*
* @return return the sequence after combination.
*/
private Sequence combine() {
boolean recBlock = false;
Sequence normalSeq = new Sequence();
Sequence recSequence = new DeclSequence();
for (TypedAST ast : this.getIterator()) {
if (ast instanceof TypeVarDecl
|| ast instanceof DefDeclaration
|| ast instanceof TypeAbbrevDeclaration) {
Declaration d = (Declaration) ast;
if (recBlock == false) {
recBlock = true;
recSequence = new DeclSequence();
}
recSequence = Sequence.append(recSequence, d);
} else {
if (recBlock == true) {
normalSeq = Sequence.append(normalSeq, recSequence);
}
normalSeq = Sequence.append(normalSeq, ast);
recBlock = false;
}
}
if (recBlock == true) {
normalSeq = Sequence.append(normalSeq, recSequence);
}
return normalSeq;
}
/**
* Generate IL expression for a top-level declaration sequence</br>
*
* @see GenUtil.doGenModuleIL
* @param ctx the context
* @param isModule whether is is actually a module expression: true for the body of a module,
* false for the body of a script
* @return the IL expression of a module
*/
public Expression generateModuleIL(GenContext ctx, boolean isModule) {
Sequence seqWithBlocks = combine();
TopLevelContext tlc = new TopLevelContext(ctx);
seqWithBlocks.genTopLevel(tlc);
Expression result = isModule ? tlc.getModuleExpression() : tlc.getExpression();
/*Iterator<TypedAST> ai = seqWithBlocks.iterator();
if (!ai.hasNext())
throw new RuntimeException("expected an expression in the list");
Expression decl = GenUtil.doGenModuleIL(ctx, ctx, ctx, ai, isModule);*/
return result;
}
public static Sequence append(Sequence s, TypedAST e) {
Iterator<TypedAST> innerIter = s.iterator();
if (s instanceof DeclSequence && e instanceof Declaration) {
return DeclSequence.simplify(new DeclSequence(s, e));
}
return new Sequence(
() ->
new Iterator<TypedAST>() {
private boolean fetched = false;
@Override
public boolean hasNext() {
if (innerIter.hasNext()) return true;
return !fetched;
}
@Override
public TypedAST next() {
if (innerIter.hasNext()) return innerIter.next();
if (!fetched) {
fetched = true;
return e;
}
throw new RuntimeException();
}
});
}
