[Haskell-cafe] parsec get line number of lexems
olivier.duhart at gmail.com
Mon Jul 18 14:58:49 UTC 2016
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
>> 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
>>> (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?
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