[antlr-interest] access to filename

[Mark Wright]

On Sun, May 02, 2010 at 08:49:13PM +0200, Joep Suijs wrote:
> Hi guys,
> 
> For error reporting, I need access to the origination of a token when
> I walk through the tree after it is parsed. This works okay for line
> number and position on the line, but fails for the filename. A piece
> of the code used:
> 
>       ANTLR3_UINT32 TokenType = child->getType(child);
>       CIndent(Level);
>       printf("%s (%d, %s from ",child->toString(child)->chars,
> TokenType, jalParserTokenNames[TokenType]);
> 
>       ANTLR3_INPUT_STREAM *is = Token->input;
>       printf("input stream %x,",is);
> //      printf("input stream %d,",is->fileName);

Hi Joep,

You might be able to workaround this by obtaining
the file name from a pointer to your lexer that
was generated by ANTLR, something like:

jalLexer *lexer;
// Need to initialize lexer somehow
printf("file name %s,",lexer->pLexer->input->fileName->chars);

Regards, Mark

>       printf("Line %d:%d)",Token->getLine(Token),
> Token->getCharPositionInLine(Token));
> 
> The input stream print shows a non-zero pointer, but uncommenting the
> last line triggers an exception. The next line prints the line &
> postion as expected.
> What am I doing wrong?
> 
> Joep
> 
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