Expr HandleLogicalExpr(Expr left)
{
_parser.Forward();
// Right associative operators to support short-circuit (hence the -1 on the level).
return(new BinaryExpr(_parser.PrevNonCommentLocation, left, _parser.PrevNonCommentToken, Expression(_parser.PrevNonCommentToken.PrecedenceLevel() - 1)));
}
Expr HandleNud()
{
if (_parser.IsErrorOrEndOfInput)
{
return(new SyntaxErrorExpr(_parser.Location, "Error: " + _parser.ErrorCode.ToString()));
}
Debug.Assert(!_parser.IsErrorOrEndOfInput);
if (_parser.IsNumber)
{
return(new ConstantExpr(_parser.Location, _parser.ReadDouble(), _parser.Match(TokenizerToken.SemiColon)));
}
if (_parser.IsString)
{
return(new ConstantExpr(_parser.Location, _parser.ReadString(), _parser.Match(TokenizerToken.SemiColon)));
}
if (_parser.IsUnaryOperatorOrPlusOrMinus)
{
return(HandleUnaryExpr());
}
if (_parser.IsIdentifier)
{
if (_parser.MatchIdentifier("if"))
{
return(HandleIf());
}
if (_parser.MatchIdentifier("let"))
{
return(HandleLet());
}
if (_parser.MatchIdentifier("while"))
{
return(HandleWhile());
}
if (_parser.MatchIdentifier("break"))
{
return(new FlowBreakingExpr(_parser.PrevNonCommentLocation, false));
}
if (_parser.MatchIdentifier("continue"))
{
return(new FlowBreakingExpr(_parser.PrevNonCommentLocation, true));
}
if (_parser.MatchIdentifier("return"))
{
return(new FlowBreakingExpr(_parser.PrevNonCommentLocation, Expression(0), false));
}
if (_parser.MatchIdentifier("throw"))
{
return(new FlowBreakingExpr(_parser.PrevNonCommentLocation, Expression(0), true));
}
if (_parser.MatchIdentifier("do"))
{
return(HandleDoWhile());
}
if (_parser.MatchIdentifier("foreach"))
{
return(HandleForeach());
}
if (_parser.MatchIdentifier("function"))
{
return(HandleFunction());
}
if (_parser.MatchIdentifier("try"))
{
return(HandleTryCatch());
}
if (_parser.MatchIdentifier("with"))
{
return(HandleWith());
}
return(HandleIdentifier());
}
if (_parser.Match(TokenizerToken.OpenCurly))
{
return(HandleBlock());
}
if (_parser.Match(TokenizerToken.OpenPar))
{
SourceLocation location = _parser.PrevNonCommentLocation;
Expr e = Expression(0);
if (e is SyntaxErrorExpr)
{
return(e);
}
return(_parser.Match(TokenizerToken.ClosePar) ? e : new SyntaxErrorExpr(_parser.Location, "Expected ')' opened at {0}.", location));
}
if (_parser.Match(TokenizerToken.SemiColon))
{
return(NopExpr.Statement);
}
return(new SyntaxErrorExpr(_parser.Location, "Syntax Error."));
}
Expr HandleBinaryExpr(Expr left)
{
_parser.Forward();
return(new BinaryExpr(_parser.PrevNonCommentLocation, left, _parser.PrevNonCommentToken, Expression(_parser.PrevNonCommentToken.PrecedenceLevel())));
}