private Expression ParsePostfixExpression ()
{
Expression expr = ParseLeftHandSideExpression ();
switch (current.Kind) {
case Token.Type.PlusPlus :
expr = new UnaryOperatorExpression (expr, Expression.Operation.PostfixPlusPlus, new TextSpan (expr.Location.StartLine, expr.Location.StartColumn, current.StartLine, current.StartColumn + current.Width, expr.Location.StartPosition, current.StartPosition+current.Width));
Next ();
break;
case Token.Type.MinusMinus:
expr = new UnaryOperatorExpression (expr, Expression.Operation.PostfixMinusMinus, new TextSpan (expr.Location.StartLine, expr.Location.StartColumn, current.StartLine, current.StartColumn + current.Width, expr.Location.StartPosition, current.StartPosition + current.Width));
Next ();
break;
}
return expr;
}
private Expression ParseUnaryExpression (bool noIn)
{
Token start = current;
Expression expr;
// get by first token
switch (current.Kind) {
case Token.Type.delete:
Next ();
expr = new UnaryOperatorExpression (this.ParseExpression (noIn), Expression.Operation.delete, new TextSpan (start, current));
break;
case Token.Type.@void:
Next ();
expr = new UnaryOperatorExpression (this.ParseExpression (noIn), Expression.Operation.@void, new TextSpan (start, current));
break;
case Token.Type.@typeof:
Next ();
expr = new UnaryOperatorExpression (this.ParseExpression (noIn), Expression.Operation.@typeof, new TextSpan (start, current));
break;
case Token.Type.PlusPlus:
Next ();
expr = new UnaryOperatorExpression (this.ParseExpression (noIn), Expression.Operation.PrefixPlusPlus, new TextSpan (start, current));
break;
case Token.Type.MinusMinus:
Next ();
expr = new UnaryOperatorExpression (this.ParseExpression (noIn), Expression.Operation.PrefixMinusMinus, new TextSpan (start, current));
break;
case Token.Type.Plus:
Next ();
expr = new UnaryOperatorExpression (this.ParseExpression (noIn), Expression.Operation.PrefixPlus, new TextSpan (start, current));
break;
case Token.Type.Minus:
Next ();
expr = new UnaryOperatorExpression (this.ParseExpression (noIn), Expression.Operation.PrefixMinus, new TextSpan (start, current));
break;
case Token.Type.Tilda:
Next ();
expr = new UnaryOperatorExpression (this.ParseExpression (noIn), Expression.Operation.Tilda, new TextSpan (start, current));
break;
case Token.Type.Bang:
Next ();
expr = new UnaryOperatorExpression (this.ParseExpression (noIn), Expression.Operation.Bang, new TextSpan (start, current));
break;
default:
expr = ParsePostfixExpression ();
break;
}
//Next (); //go ahead
return expr;
}
private Expression ParseLeftHandSideExpression ()
{
Token start = current;
Expression expr;
switch (current.Kind) {
//primary expression
case Token.Type.@this:
expr = new Expression (Expression.Operation.@this, new TextSpan (current, current));
break;
case Token.Type.Identifier:
expr = new IdentifierExpression ((current as IdentifierToken).Spelling, new TextSpan (current, current));
break;
case Token.Type.@null:
expr = new NullExpression (new TextSpan (current, current));
break;
case Token.Type.@true:
expr = new Expression (Expression.Operation.@true, new TextSpan (current, current));
break;
case Token.Type.@false:
expr = new Expression (Expression.Operation.@false, new TextSpan (current, current));
break;
case Token.Type.NumericLiteral:
expr = new NumericLiteralExpression (((NumericLiteralToken)current).Spelling, new TextSpan (current, current));
break;
case Token.Type.OctalIntegerLiteral:
expr = new OctalLiteralExpression (((OctalIntegerLiteralToken)current).Value, new TextSpan (current, current));
break;
case Token.Type.HexIntegerLiteral:
expr = new HexLiteralExpression (((HexIntegerLiteralToken)current).Value, new TextSpan (current, current));
break;
case Token.Type.StringLiteral:
expr = new StringLiteralExpression ((current as StringLiteralToken).Value, (current as StringLiteralToken).Spelling, new TextSpan (current, current));
break;
case Token.Type.LeftBracket:
expr = ParseArrayLiteral ();
break;
case Token.Type.LeftBrace:
expr = ParseObjectLiteral ();
break;
case Token.Type.LeftParenthesis:
Next ();
expr = new UnaryOperatorExpression(ParseExpression (), Expression.Operation.Parenthesized, new TextSpan(current,current));
CheckSyntaxExpected (Token.Type.RightParenthesis);
break;
//end primary
case Token.Type.function:
expr = new FunctionExpression (ParseFunctionDefinition ());
break;
case Token.Type.@new:
Next ();
Expression target = ParseExpression ();
ArgumentList arguments;
if (current.Kind == Token.Type.LeftParenthesis) {
arguments = this.ParseArgumentList ();
} else {
arguments = new ArgumentList (new List<ExpressionListElement> (), new TextSpan (start, current));
}
expr = new InvocationExpression (target, arguments,Expression.Operation.@new, new TextSpan(start,current));
break;
default:
SyntaxError.Add ("Expression start with a strange token :" + current.Kind.ToString ());
return new Expression (Expression.Operation.SyntaxError, new TextSpan (start, current));
}
Next (); // to go ahead for other part
return ParseRightExpression (expr);
}
