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);
}
private Expression ParseObjectLiteral ()
{
Token start = current;
Next ();
List<ObjectLiteralElement> elements = new List<ObjectLiteralElement> ();
if (current.Kind == Token.Type.RightBrace) {
return new ObjectLiteralExpression (elements, new TextSpan (start, current));
}
ObjectLiteralElement element;
TextPoint comma = new TextPoint ();
TextPoint colon = new TextPoint ();
Expression name;
do {
switch (current.Kind) {
case Token.Type.Identifier:
name = new IdentifierExpression ((current as IdentifierToken).Spelling, new TextSpan (current, current));
break;
case Token.Type.NumericLiteral:
name = new NumericLiteralExpression (((NumericLiteralToken)current).Spelling, new TextSpan (current, current));
break;
case Token.Type.StringLiteral:
name = new StringLiteralExpression ((current as StringLiteralToken).Value, (current as StringLiteralToken).Spelling, new TextSpan (current, current));
break;
default:
Error (DiagnosticCode.SyntaxError, new TextSpan (current, current));
return new Expression (Expression.Operation.SyntaxError, new TextSpan (current, current));
}
Next ();
CheckSyntaxExpected (Token.Type.Colon);
colon = new TextPoint (current.StartPosition);
Next ();
Expression val = ParseAssignmentExpression (false);
element = new ObjectLiteralElement (name, val, colon, comma);
elements.Add (element);
comma = new TextPoint (current.StartPosition);
} while (current.Kind == Token.Type.Comma);
CheckSyntaxExpected (Token.Type.RightBrace);
elements.Add (element);
return new ObjectLiteralExpression (elements, new TextSpan (start, current));
}