// list_for: 'for' target_list 'in' old_expression_list [list_iter]
private ComprehensionFor ParseListCompFor()
{
Eat(TokenKind.KeywordFor);
string startWhiteSpace = _tokenWhiteSpace;
var start = GetStart();
bool trailingComma;
List<string> listWhiteSpace;
List<Expression> l = ParseExpressionList(out trailingComma, out listWhiteSpace);
// expr list is something like:
// ()
// a
// a,b
// a,b,c
// we either want just () or a or we want (a,b) and (a,b,c)
// so we can do tupleExpr.EmitSet() or loneExpr.EmitSet()
Expression lhs = MakeTupleOrExpr(l, listWhiteSpace, trailingComma, true);
bool ateIn = Eat(TokenKind.KeywordIn);
string inWhiteSpace;
Expression list;
if (ateIn) {
inWhiteSpace = _tokenWhiteSpace;
if (_langVersion.Is7x()) {
list = ParseOrTest();
} else {
list = ParseOldExpressionListAsExpr();
}
} else {
inWhiteSpace = null;
list = Error("");
}
ComprehensionFor ret = new ComprehensionFor(lhs, list);
if (_verbatim) {
AddPreceedingWhiteSpace(ret, startWhiteSpace);
if (inWhiteSpace != null) {
AddSecondPreceedingWhiteSpace(ret, inWhiteSpace);
}
if (!ateIn) {
AddErrorIsIncompleteNode(ret);
}
}
ret.SetLoc(start, GetEnd());
return ret;
}
// ComprehensionFor
public override bool Walk(ComprehensionFor node)
{
return ShouldWalkWorker(node);
}
public override bool Walk(ComprehensionFor node)
{
if (node.Left != null) {
node.Left.Walk(Define);
}
if (node.List != null) {
node.List.Walk(this);
}
return false;
}
public override void PostWalk(ComprehensionFor node)
{
PostWalkWorker(node);
}
