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...@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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