[Haskell-cafe] Parsec error message not making any sense

[Roman Cheplyaka]

Hi Fredrik,

First, do you use the latest parsec version (3.1.3)? If not, can you try
the same with 3.1.3?

Second, please upload your code to hpaste.org or a similar service and
give us the link. It's not much fun to extract code from an html email.

Roman

* Fredrik Karlsson <dargosch at gmail.com> [2013-07-08 23:54:17+0200]
> Dear list,
> 
> I have a Parsec parser that fails and gives the following error message:
> 
> *Main> parseFromFile textgridfile testFile
> Left
> "/Users/frkkan96/Documents/src/ume/umecore/testing/testdata/testdata.TextGrid"
> (line 35, column 5):
> unexpected "t"
> expecting "intervals ["
> 
> Now, this is perfectly understandable, but line 35, col 5 in the file being
> parsed looks like the supplies image - there is no 't' there.
> 
> Any ideas on what is going on?
> 
> The parser I am using is:
> 
> data VariableLine = VariableLine String String deriving Show
> data TierType = IntervalTier | PointTier deriving Show
> 
> data Tier = Tier String deriving Show
> data LabelFile = LabelFile Double Double deriving Show
> 
> data Label = Label String TierType Double Double String deriving Show
> 
> 
> haskelldef = makeTokenParser haskellDef
> 
> 
> textgridfile :: Parser (LabelFile, [[Label]])
> textgridfile = do
> h <- header
> ll <- many1 tier
> return $ (h,ll)
> 
> header :: Parser LabelFile
> header = do
> string headTS1
> start <- try (float haskelldef)
> <|> (fmap fromInteger $ integer haskelldef )
> string "xmax = "
> end <- try (float haskelldef)
> <|> (fmap fromInteger $ integer haskelldef )
> string "tiers? <exists> \n"
> string "size = "
> integer haskelldef
> string "item []:"
> whiteSpace haskelldef
> return $ LabelFile start end
> 
> tier :: Parser [Label]
> tier = do
> whiteSpace haskelldef
> string "item ["
> integer haskelldef
> string "]:"
> whiteSpace haskelldef
> try (string "class = \"IntervalTier\"")
> <|> string "class = \"TextTier\""
> whiteSpace haskelldef
> string "name = "
> char '"'
> name <- many quotedChar
> char '"' <?> "quote at end of cell"
> whiteSpace haskelldef
> string "xmin = "
> try (float haskelldef) <|> (fmap fromInteger $ integer haskelldef )
> whiteSpace haskelldef
> string "xmax = "
> try (float haskelldef) <|> (fmap fromInteger $ integer haskelldef )
> string "intervals: size = " <|> string "points: size = "
> integer haskelldef
> whiteSpace haskelldef
> labelList <- many1 (interval name)
> return $ labelList
> interval :: String -> Parser Label
> interval tierName = do
> whiteSpace haskelldef
> string "intervals ["
> integer haskelldef
> string "]:"
> whiteSpace haskelldef
> string "xmin = "
> start <- try (float haskelldef)
> <|> (fmap fromInteger $ integer haskelldef )
> whiteSpace haskelldef
> string "xmax = "
> end <- try (float haskelldef)
> <|> (fmap fromInteger $ integer haskelldef )
> whiteSpace haskelldef
> string "text = "
> char '"'
> text <- many quotedChar
> char '"' <?> "quote at end of cell"
> return $ Label tierName IntervalTier start end text
> 
> which fails on the attached input file.
> 
> I can't see how 't' is found?? What am I doing wrong?
> 
> /Fredrik
> 
> 
> 
> -- 
> "Life is like a trumpet - if you don't put anything into it, you don't get
> anything out of it."



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