103 lines
3 KiB
Haskell
103 lines
3 KiB
Haskell
{-
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Copyright (C) 2017 John MacFarlane <jgm@berkeley.edu>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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-}
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{- |
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Module : Text.Pandoc.CSV
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Copyright : Copyright (C) 2017 John MacFarlane <jgm@berkeley.edu>
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License : GNU GPL, version 2 or above
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Maintainer : John MacFarlane <jgm@berkeley.edu>
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Stability : alpha
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Portability : portable
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Simple CSV parser.
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-}
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module Text.Pandoc.CSV (
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CSVOptions(..),
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defaultCSVOptions,
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parseCSV,
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ParseError
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) where
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import Text.Parsec
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import Text.Parsec.Text (Parser)
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import Data.Text (Text)
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import qualified Data.Text as T
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import Control.Monad (void)
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data CSVOptions = CSVOptions{
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csvDelim :: Char
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, csvQuote :: Char
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, csvKeepSpace :: Bool -- treat whitespace following delim as significant
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, csvEscape :: Maybe Char -- default is to double up quote
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} deriving (Read, Show)
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defaultCSVOptions :: CSVOptions
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defaultCSVOptions = CSVOptions{
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csvDelim = ','
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, csvQuote = '"'
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, csvKeepSpace = False
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, csvEscape = Nothing }
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parseCSV :: CSVOptions -> Text -> Either ParseError [[Text]]
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parseCSV opts t = parse (pCSV opts) "csv" t
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pCSV :: CSVOptions -> Parser [[Text]]
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pCSV opts =
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(pCSVRow opts `sepEndBy` endline) <* (spaces *> eof)
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pCSVRow :: CSVOptions -> Parser [Text]
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pCSVRow opts = notFollowedBy blank >> pCSVCell opts `sepBy` pCSVDelim opts
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blank :: Parser ()
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blank = try $ spaces >> (() <$ endline <|> eof)
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pCSVCell :: CSVOptions -> Parser Text
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pCSVCell opts = pCSVQuotedCell opts <|> pCSVUnquotedCell opts
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pCSVQuotedCell :: CSVOptions -> Parser Text
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pCSVQuotedCell opts = do
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char (csvQuote opts)
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res <- many (satisfy (\c -> c /= csvQuote opts &&
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Just c /= csvEscape opts) <|> escaped opts)
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char (csvQuote opts)
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return $ T.pack res
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escaped :: CSVOptions -> Parser Char
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escaped opts = do
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case csvEscape opts of
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Nothing -> try $ char (csvQuote opts) >> char (csvQuote opts)
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Just c -> try $ char c >> noneOf "\r\n"
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pCSVUnquotedCell :: CSVOptions -> Parser Text
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pCSVUnquotedCell opts = T.pack <$>
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many (satisfy (\c -> c /= csvDelim opts && c /= '\r' && c /= '\n'
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&& c /= csvQuote opts))
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pCSVDelim :: CSVOptions -> Parser ()
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pCSVDelim opts = do
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char (csvDelim opts)
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if csvKeepSpace opts
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then return ()
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else skipMany (oneOf " \t")
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endline :: Parser ()
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endline = do
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optional (void $ char '\r')
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void $ char '\n'
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