private Arg FinishKeywordArgument(Expression t) {
Debug.Assert(_token.Token.Kind == TokenKind.Assign);
string equalWhiteSpace = _tokenWhiteSpace;
NameExpression n = t as NameExpression;
string name;
if (n == null) {
ReportSyntaxError(t.StartIndex, t.EndIndex, "expected name");
name = null;
} else {
name = n.Name;
}
Expression val = ParseExpression();
Arg arg = new Arg(t, val);
arg.SetLoc(t.StartIndex, val.EndIndex);
if (_verbatim) {
AddPreceedingWhiteSpace(arg, equalWhiteSpace);
}
// we're losing the name expression...
return arg;
}
// arglist:
// expression rest_of_arguments
// expression "=" expression rest_of_arguments
// expression "for" gen_expr_rest
//
private Arg[] FinishArgListOrGenExpr(out List<string> commaWhiteSpace, out bool ateTerminator) {
Arg a = null;
commaWhiteSpace = MakeWhiteSpaceList();
Token t = PeekToken();
if (t.Kind != TokenKind.RightParenthesis && t.Kind != TokenKind.Multiply && t.Kind != TokenKind.Power) {
Expression e = ParseExpression();
if (e is ErrorExpression) {
ateTerminator = false;
return new[] { new Arg(e) };
}
if (MaybeEat(TokenKind.Assign)) { // Keyword argument
a = FinishKeywordArgument(e);
} else if (PeekToken(Tokens.KeywordForToken)) { // Generator expression
var genExpr = ParseGeneratorExpression(e);
AddIsAltForm(genExpr);
a = new Arg(genExpr);
ateTerminator = Eat(TokenKind.RightParenthesis);
a.SetLoc(e.StartIndex, GetEnd());
return new Arg[1] { a }; // Generator expression is the argument
} else {
a = new Arg(e);
a.SetLoc(e.StartIndex, e.EndIndex);
}
// Was this all?
//
if (MaybeEat(TokenKind.Comma)) {
if (commaWhiteSpace != null) {
commaWhiteSpace.Add(_tokenWhiteSpace);
}
} else {
ateTerminator = Eat(TokenKind.RightParenthesis);
a.SetLoc(e.StartIndex, GetEnd());
return new Arg[1] { a };
}
}
return FinishArgumentList(a, commaWhiteSpace, out ateTerminator); // TODO: Use ateTerminator
}
