[antlr-interest] Fortran lexer problem

[Юрушкин Михаил]

Thank you. I have decided to follow your question :) It was interesting  
for me to find
more 'clear' way.


<kferrio at gmail.com> писал(а) в своём письме Mon, 18 Jan 2010 00:10:59  
+0300:

> Michael...  I feel pity for you if have to parse F77.  You're going to  
> run into a few problems harder to solve/avoid than this.  So if you're  
> just going to discard comments anyway... I suggest you prefilter your  
> input with a tool like 'sed' to strip fixed format comments.  Then you  
> can get on with quirky things like Fortran edit descriptors.  :)
>
> Kyle
>
> Sent from my Verizon Wireless BlackBerry
>
> -----Original Message-----
> From: Юрушкин Михаил <yurushkin at rambler.ru>
> Date: Fri, 15 Jan 2010 21:56:21
> To: Юрушкин Михаил<yurushkin at rambler.ru>; Jim  
> Idle<jimi at temporal-wave.com>;  
> antlr-interest at antlr.org<antlr-interest at antlr.org>
> Subject: Re: [antlr-interest] Fortran lexer problem
>
> I have the following term
>
> LINE_COMMENT
>      : ({blabla}? ('c' | 'C' | '*') | '!' )  ~('\n')*
>          {
>              $channel = HIDDEN;
>          }
>      ;
>
> but it only pasts the following code at the end:
>
>
>             switch (alt31)
>              {
>          	case 1:
>          	    {
>          	        if ( !((blabla)) )
>          	        {
>          	                CONSTRUCTEX();
>          	                EXCEPTION->type         =
> ANTLR3_FAILED_PREDICATE_EXCEPTION;
>          	                EXCEPTION->message      = (void *)"blabla";
>          	                EXCEPTION->ruleName	 = (void *)"LINE_COMMENT";
>          	        }
>
>
> if "blabla" is false, an error is occured... but it's not right.
>
> Юрушкин Михаил <yurushkin at rambler.ru> писал(а) в своём письме Fri, 15 Jan
> 2010 21:27:22 +0300:
>
>> Excuse me, but how can I specify this condition (is it a first symbol  
>> and
>> symbol='c')?
>> Could you send me a piece of lexer grammar?
>>
>>
>> Jim Idle <jimi at temporal-wave.com> писал(а) в своём письме Fri, 15 Jan
>> 2010
>> 21:20:46 +0300:
>>
>>> I think Fortran comments that start with C have to have the C in
>>> character position 0 (or 1 in Fortran I guess ;-). So your comment rule
>>> can be predicated by checking for line position 0 in ANTLR terms.
>>>
>>> Jim
>>>
>>>> -----Original Message-----
>>>> From: antlr-interest-bounces at antlr.org [mailto:antlr-interest-
>>>> bounces at antlr.org] On Behalf Of Þðóøêèí Ìèõàèë
>>>> Sent: Friday, January 15, 2010 9:51 AM
>>>> To: antlr-interest at antlr.org
>>>> Subject: [antlr-interest] Fortran lexer problem
>>>>
>>>> Good day,
>>>>
>>>> I want to add comments of Fortran 77:
>>>>
>>>> "c xxxxx";
>>>> First symbol in column is 'c' - it means that the following line is a
>>>> line
>>>> of comment.
>>>>
>>>> but I also have NAME token, that will conflict with such COMMENT rule.
>>>> ('c' can be a name).
>>>>
>>>> Is it possible to select rule by my own predicate? Are there any other
>>>> more clear solvings of
>>>> this problem?
>>>>
>>>>
>>>> --
>>>> Best regards,
>>>> Michael
>>>>
>>>> List: http://www.antlr.org/mailman/listinfo/antlr-interest
>>>> Unsubscribe: http://www.antlr.org/mailman/options/antlr-interest/your-
>>>> email-address
>>>
>>>
>>>
>>>
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>>
>>
>
>


-- 
Best regards,
Michael