[antlr-interest] Fortran lexer problem

Юрушкин Михаил yurushkin at rambler.ru
Fri Jan 15 10:27:22 PST 2010


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
>>
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-- 
Best regards,
Michael


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