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();
}
});
}
