// 11.4 Unary Operators
private dynamic ParseUnaryExpression()
{
//var token, expr;
var firstToken = _extra.Tokens[_extra.Tokens.Count - 1];
if (Match("++") || Match("--"))
{
var token = Lex();
var expr = ParseUnaryExpression();
// 11.4.4, 11.4.5
if (_strict && expr.Type == Syntax.Identifier && IsRestrictedWord(expr.Name))
{
ThrowError(null, Messages.StrictLHSPrefix);
}
if (!IsLeftHandSide(expr))
{
ThrowError(null, Messages.InvalidLHSInAssignment);
}
var lastToken = _extra.Tokens[_extra.Tokens.Count - 1];
expr = new UpdateExpression(_codeGeneration)
{
Operator = token.Value,
Argument = expr,
Prefix = true,
Range = new Range { Start = firstToken.Range.Start, End = lastToken.Range.End },
Loc =
new Loc
{
Start = new Loc.Position { Line = firstToken.Loc.Start.Line, Column = firstToken.Loc.Start.Column },
End = new Loc.Position { Line = lastToken.Loc.End.Line, Column = lastToken.Loc.End.Column }
}
};
return expr;
}
if (Match('+') || Match('-') || Match('~') || Match('!'))
{
var expr = new
{
Type = Syntax.UnaryExpression,
Operator = Lex().Value,
Argument = ParseUnaryExpression()
};
return expr;
}
if (MatchKeyword("delete") || MatchKeyword("void") || MatchKeyword("typeof"))
{
var expr = new
{
Type = Syntax.UnaryExpression,
Operator = Lex().Value,
Argument = ParseUnaryExpression()
};
if (_strict && expr.Operator == "delete" && expr.Argument.Type == Syntax.Identifier)
{
ThrowErrorTolerant(null, Messages.StrictDelete);
}
return expr;
}
return ParsePostfixExpression();
}
// 11.3 Postfix Expressions
private dynamic ParsePostfixExpression()
{
var expr = ParseLeftHandSideExpressionAllowCall();
var firstToken = _extra.Tokens[_extra.Tokens.Count - 1];
if ((Match("++") || Match("--")) && !PeekLineTerminator())
{
// 11.3.1, 11.3.2
if (_strict && expr.Type == Syntax.Identifier && IsRestrictedWord(expr.Name))
{
ThrowError(null, Messages.StrictLHSPostfix);
}
if (!IsLeftHandSide(expr))
{
ThrowError(null, Messages.InvalidLHSInAssignment);
}
var lastToken = _extra.Tokens[_extra.Tokens.Count - 1];
expr = new UpdateExpression(_codeGeneration)
{
Operator = Lex().Value,
Argument = expr,
Prefix = false,
Range = new Range { Start = firstToken.Range.Start, End = lastToken.Range.End },
Loc =
new Loc
{
Start = new Loc.Position { Line = firstToken.Loc.Start.Line, Column = firstToken.Loc.Start.Column },
End = new Loc.Position { Line = lastToken.Loc.End.Line, Column = lastToken.Loc.End.Column }
}
};
}
return expr;
}
