[Haskell-cafe] parsec get line number of lexems

[Olivier Duhart]

So I did it and it works exactly as expected. 

thanks again  Patrick

Le lundi 18 juillet 2016 16:58:49 UTC+2, Olivier Duhart a écrit :
>
> thanks for your answer, looks like what I am looking for. Will try and tell
>
> Le lundi 18 juillet 2016 16:50:36 UTC+2, Patrick Chilton a écrit :
>>
>> Assuming you have a constructor Binary Op Pos Expr Expr, you can do:
>>
>> Infix (Binary Multiply <$> getPosition <* reservedOp "*") AssocLeft
>>
>> See Control.Applicative for the operators.
>>
>> On Mon, Jul 18, 2016 at 4:28 PM, Olivier Duhart <olivier... at gmail.com> 
>> wrote:
>>
>>> thanks for your answer, exactly what I was looking for. Now I have 
>>> parsers like this :
>>>
>>> ifStmt :: Parser Stmt
>>> ifStmt =
>>>   do reserved "if"
>>>      *pos <- getPosition*
>>>      cond  <- expression
>>>      reserved "then"
>>>      stmt1 <- statement
>>>      reserved "else"
>>>      stmt2 <- statement
>>>      return $ If cond stmt1 stmt2 *pos*
>>>
>>> My AST is not fully "positioned" though as I don't get how to add 
>>> position in expression (more precisely on operators).
>>> I am using the buildExpressionParser to build expression parsers so I 
>>> have
>>>
>>> operators = [ [Prefix (reservedOp "-"   >> return (Neg ))          ]
>>>              , [Infix  (reservedOp "*"   >> return (Binary Multiply)) 
>>> AssocLeft, .....
>>>
>>> And I dont known how to tell parsec to add a SourcePos to my operators.
>>>
>>> Any suggestion please ?
>>>
>>>
>>>
>>>
>>> Le dimanche 17 juillet 2016 19:09:32 UTC+2, Francesco Ariis a écrit :
>>>>
>>>> On Sun, Jul 17, 2016 at 09:50:27AM -0700, Olivier Duhart wrote:
>>>> > is ther a way to get the line numbers at parsers level?
>>>>
>>>> Hi Olivier,
>>>>     maybe you are looking for
>>>>
>>>>     
>>>> http://hackage.haskell.org/package/parsec-3.1.11/docs/Text-Parsec.html#v:getPosition
>>>>
>>>> (which is very simple and used mainly for error reporting) or you could
>>>> just keep track of `currLine` into a State of your choice (the 's' in
>>>> ParsecT s ...).
>>>> Does that help?
>>>> -F
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>>
>>
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