Re: [Haskell-cafe] parsec get line number of lexems

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 :

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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 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 :

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On Sun, Jul 17, 2016 at 09:50:27AM -0700, Olivier Duhart wrote:

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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:get...

(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 _______________________________________________ Haskell-Cafe mailing list To (un)subscribe, modify options or view archives go to: http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe Only members subscribed via the mailman list are allowed to post.

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