public Sequence(TypedAST first, TypedAST second) {
if (first instanceof Sequence) {
exps.addAll(((Sequence) first).exps);
} else if (first != null) {
exps.add(check(first));
}
if (second instanceof Sequence) {
exps.addAll(((Sequence) second).exps);
} else if (second != null) {
exps.add(check(second));
}
}
@Override
public Type typecheck(Environment env, Optional<Type> expected) {
Type lastType = new Unit();
for (TypedAST t : exps) {
if (t == null) continue;
lastType = t.typecheck(env, (exps.getLast() == t) ? expected : Optional.empty());
if (t instanceof EnvironmentExtender) env = ((EnvironmentExtender) t).extend(env, env);
}
retType = lastType;
return lastType;
}
public Sequence(Iterable<TypedAST> first) {
exps = new LinkedList<TypedAST>();
for (TypedAST elem : first) exps.add(check(elem));
}
public Sequence(TypedAST first) {
exps.add(check(first));
}
public int size() {
return exps.size();
}
public TypedAST getLast() {
return exps.getLast();
}
@Override
public Iterator<TypedAST> iterator() {
return exps.iterator();
}
@Override
public void writeArgsToTree(TreeWriter writer) {
writer.writeArgs(exps.toArray());
// TODO Auto-generated method stub
}