[antlr-interest] How to use lexer getCharPositionInLine() function in Cpp target

[Gokulakannan Somasundaram]

You don't need to write it inside the Cpp file. Just write it in the
grammar.

Gokul.

On Tue, Oct 16, 2012 at 8:56 AM, Gokulakannan Somasundaram <
gokul007 at gmail.com> wrote:

> Yeah. That looks like a bug. I will need to change the stg file. For now,
> you can directly write m_ctx->getCharPositionInLine() in place of getCharPositionInLine()
> and let me know, whether it works.
>
> Thanks,
> Gokul.
>
> On Tue, Oct 16, 2012 at 8:28 AM, Richard Gildea <rgildea at gmail.com> wrote:
>
>> Hi Gokul,
>>
>> The problem is that the predicate also appears in one of the generated
>> TLexerCyclicDFA functions, leading to the following compilation error:
>>
>> error: no member named 'getCharPositionInLine' in 'cifLexerCyclicDFA33'
>>                             if ( (( this->getCharPositionInLine() > 0 )) )
>>                                     ~~~~  ^
>>
>> Manually editing the generated code to read ctx->getCharPositionInLine()
>> fixes the compilation.
>>
>> Cheers,
>>
>> Richard
>>
>>
>> On 15 October 2012 17:13, Gokulakannan Somasundaram <gokul007 at gmail.com>wrote:
>>
>>> getCharPositionInLine() function is present inside Lexer. You can just
>>> call it as similar to Java.
>>> just replace the MACRO GETCHARPOSITIONINLINE() with
>>> this->getCharPositionInLine() ?
>>>
>>> I can't understand second part of your question.
>>>
>>> Thanks,
>>> Gokul.
>>>
>>>
>>> On Tue, Oct 16, 2012 at 2:43 AM, Richard Gildea <rgildea at gmail.com>wrote:
>>>
>>>> Hi,
>>>>
>>>> I am attempting to convert my parser to use the Cpp target after
>>>> previously
>>>> using the C target for some time, and have come across a problem trying
>>>> to
>>>> call the function TLexer::getCharPositionInLine() inside a gated
>>>> semantic
>>>> predicate in one of my lexer rules. With the C target I was using a
>>>> construct such as
>>>>
>>>> ({ GETCHARPOSITIONINLINE() > 0 }?=> ';')
>>>>
>>>> to identify a semicolon character in the first column of a line. When
>>>> trying to use a similar construct with the Cpp target, in the generated
>>>> code this predicate is used both inside the lexer rule, where the
>>>> correct
>>>> usage would be this->getCharPositionInLine(), and inside a cyclicDFA,
>>>> where
>>>> the usage would be ctx->getCharPositionInLine(). Is there a way to use
>>>> such
>>>> a predicate with the Cpp target?
>>>>
>>>> Cheers,
>>>>
>>>> Richard
>>>>
>>>> List: http://www.antlr.org/mailman/listinfo/antlr-interest
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>>>
>>>
>>
>