[antlr-interest] Empty Quoted String Literal

[G. Richard Bellamy]

Thanks again folks... sorry for wasting your bandwidth.

-rb

On 7/27/2011 2:28 PM, Jim Idle wrote:
> Your literal string consists of just 1 double quote, hence the error
> message is correct:
>
> http://msdn.microsoft.com/en-us/library/aa691090(v=vs.71).aspx
>
>
> Jim
>
>
>
>> -----Original Message-----
>> From: antlr-interest-bounces at antlr.org [mailto:antlr-interest-
>> bounces at antlr.org] On Behalf Of G. Richard Bellamy
>> Sent: Wednesday, July 27, 2011 2:01 PM
>> To: antlr-interest at antlr.org
>> Subject: [antlr-interest] Empty Quoted String Literal
>>
>> Sam, Bart&  Jim, I really appreciate your help on this.
>>
>> Here's a more complete example, without the greedy confusion. I'm
>> including the combined grammar and a test rig.
>>
>> I get: CombinedLexer:line 1:2 mismatched character '<EOF>' expecting
>> '"'
>> just before a NullReferenceException.
>>
>> GRAMMAR:
>> ----------------------------
>> grammar Combined;
>>
>> options {
>> language=CSharp3;
>> TokenLabelType=CommonToken;
>> output=AST;
>> ASTLabelType=CommonTree;
>> }
>>
>> @lexer::namespace{StringLiteralLexerTest}
>> @parser::namespace{StringLiteralLexerTest}
>>
>> /*
>> * Parser Rules
>> */
>>
>> public
>> compileUnit
>> : STRING
>> ;
>>
>> /*
>> * Lexer Rules
>> */
>> STRING : '"' ('""' | ~'"')* '"';
>>
>> TEST RIG:
>> ------------------------------
>> static void Main()
>> {
>> CombinedLexer lexer = new CombinedLexer(new ANTLRStringStream(@""""));
>> //lexer.TraceDestination = new
>> ConsoleTextWriter(typeof(CombinedLexer));
>>
>> CommonTokenStream tokenStream = new CommonTokenStream(lexer);
>>
>> CombinedParser parser = new CombinedParser(tokenStream);
>> //parser.TraceDestination = new
>> ConsoleTextWriter(typeof(CombinedParser));
>>
>> CommonTree parseTree = parser.compileUnit().Tree;
>> Console.WriteLine(parseTree.ToStringTree());
>> }
>>
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