[Haskell-cafe] parsec get line number of lexems

[Olivier Duhart]

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 
> <javascript:>> 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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