public RuntimeError CreateAccessorSyntaxError( AccessorExpr e )
{
AccessorMemberExpr m = e as AccessorMemberExpr;
if( m != null )
{
if( m.IsUnbound ) return CreateSyntaxError( e, "Undefined in scope: " + m.Name );
return CreateSyntaxError( e, "Unknown property: " + m.Name );
}
if( e is AccessorIndexerExpr ) return CreateSyntaxError( e, "Indexer is not supported." );
return CreateSyntaxError( e, "Not a function." );
}
public PrePostIncDecExpr(SourceLocation location, AccessorExpr operand, bool plus, bool prefix, bool isStatement)
: base(location, isStatement, true)
{
if (operand == null)
{
throw new ArgumentNullException("left");
}
Operand = operand;
Plus = plus;
Prefix = prefix;
}
public AssignExpr(SourceLocation location, AccessorExpr left, Expr right)
: base(location, right.IsStatement, true)
{
if (left == null)
{
throw new ArgumentNullException("left");
}
if (right == null)
{
throw new ArgumentNullException("right");
}
Left = left;
Right = right;
}
Expr HandlePostIncDec(Expr left)
{
var loc = _parser.Location;
var t = _parser.CurrentToken;
_parser.Forward();
AccessorExpr a = left as AccessorExpr;
if (a == null)
{
return(new SyntaxErrorExpr(loc, "invalid increment operand."));
}
return(new PrePostIncDecExpr(loc, a, t == JSTokenizerToken.PlusPlus, false, _parser.Match(JSTokenizerToken.SemiColon)));
}
public RuntimeError CreateAccessorSyntaxError(AccessorExpr e)
{
AccessorMemberExpr m = e as AccessorMemberExpr;
if (m != null)
{
if (m.IsUnbound)
{
return(CreateSyntaxError(e, "Undefined in scope: " + m.Name));
}
return(CreateSyntaxError(e, "Unknown property: " + m.Name));
}
if (e is AccessorIndexerExpr)
{
return(CreateSyntaxError(e, "Indexer is not supported."));
}
return(CreateSyntaxError(e, "Not a function."));
}
Expr HandleAssign(Expr left, bool pureAssign = false)
{
var location = _parser.Location;
AccessorExpr a = left as AccessorExpr;
if (a == null)
{
return(new SyntaxErrorExpr(location, "Invalid assignment left-hand side."));
}
if (pureAssign || _parser.Match(JSTokenizerToken.Assign))
{
return(new AssignExpr(location, a, Expression(JSTokenizer.PrecedenceLevel(JSTokenizerToken.Comma))));
}
JSTokenizerToken binaryTokenType = JSTokenizer.FromAssignOperatorToBinary(_parser.CurrentToken);
_parser.Forward();
return(new AssignExpr(location, a, new BinaryExpr(location, left, binaryTokenType, Expression(0))));
}
Expr HandleAssign(AccessorExpr left, AccessorExpr leftSource, string unboundName = null)
{
Debug.Assert(left != null);
var location = _parser.Location;
if (_parser.Match(TokenizerToken.Assign))
{
return(new AssignExpr(location, left, Expression(2)));
}
if (leftSource == null)
{
leftSource = new AccessorMemberExpr(_parser.Location, null, unboundName, false);
}
TokenizerToken binaryTokenType = _parser.CurrentToken.FromAssignOperatorToBinary();
_parser.Forward();
return(new AssignExpr(location, left, new BinaryExpr(location, leftSource, binaryTokenType, Expression(2))));
}
Expr HandleUnaryExpr()
{
var loc = _parser.Location;
var t = _parser.CurrentToken;
_parser.Forward();
// Unary operators are JSTokenizerToken.OpLevel14, except Minus and Plus that are classified as binary operators and are associated to OpLevel12.
var right = Expression(JSTokenizer.PrecedenceLevel(JSTokenizerToken.OpLevel14));
if (t == JSTokenizerToken.PlusPlus || t == JSTokenizerToken.MinusMinus)
{
AccessorExpr a = right as AccessorExpr;
if (a == null)
{
return(new SyntaxErrorExpr(loc, "invalid increment operand."));
}
return(new PrePostIncDecExpr(loc, a, t == JSTokenizerToken.PlusPlus, true, right.IsStatement));
}
return(new UnaryExpr(loc, t, right));
}
Expr HandleLed(Expr left)
{
if (_parser.IsBinaryOperator || _parser.IsCompareOperator)
{
return(HandleBinaryExpr(left));
}
if (_parser.IsLogical)
{
return(HandleLogicalExpr(left));
}
if (_parser.Match(TokenizerToken.Dot))
{
return(HandleMember(left));
}
if (_parser.Match(TokenizerToken.QuestionMark))
{
return(HandleTernaryConditional(left));
}
if (_parser.Match(TokenizerToken.OpenPar))
{
return(HandleCallOrIndex(left, TokenizerToken.ClosePar));
}
if (_parser.Match(TokenizerToken.OpenSquare))
{
return(HandleCallOrIndex(left, TokenizerToken.CloseSquare));
}
if (_parser.IsAssignOperator)
{
AccessorExpr a = left as AccessorExpr;
if (a == null)
{
return(new SyntaxErrorExpr(_parser.Location, "Invalid assignment left-hand side."));
}
return(HandleAssign(a, a));
}
if (_parser.CurrentToken == TokenizerToken.PlusPlus || _parser.CurrentToken == TokenizerToken.MinusMinus)
{
return(HandlePostIncDec(left));
}
return(new SyntaxErrorExpr(_parser.Location, "Syntax Error."));
}