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{-# LANGUAGE CPP #-}
{-
Copyright (C) 2008 John MacFarlane <jgm@berkeley.edu>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-}
{- |
Module : Text.Pandoc.Highlighting
Copyright : Copyright (C) 2008 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
Exports functions for syntax highlighting.
-}
module Text.Pandoc.Highlighting ( languages, highlightHtml, defaultHighlightingCss ) where
import Text.XHtml
import Text.Pandoc.Definition
#ifdef _HIGHLIGHTING
import Text.Highlighting.Kate ( languages, highlightAs, formatAsXHtml, FormatOption (..), defaultHighlightingCss )
import Data.List (find, lookup)
import Data.Maybe (fromMaybe)
import Data.Char (toLower)
highlightHtml :: Attr -> String -> Either String Html
highlightHtml (_, classes, keyvals) rawCode =
let firstNum = read $ fromMaybe "1" $ lookup "startFrom" keyvals
fmtOpts = [OptNumberFrom firstNum] ++
case find (`elem` ["number","numberLines","number-lines"]) classes of
Nothing -> []
Just _ -> [OptNumberLines]
lcLanguages = map (map toLower) languages
in case find (\c -> (map toLower c) `elem` lcLanguages) classes of
Nothing -> Left "Unknown or unsupported language"
Just language -> case highlightAs language rawCode of
Left err -> Left err
Right hl -> Right $ formatAsXHtml fmtOpts language hl
#else
defaultHighlightingCss :: String
defaultHighlightingCss = ""
languages :: [String]
languages = []
highlightHtml :: Attr -> String -> Either String Html
highlightHtml _ _ = Left "Pandoc was not compiled with support for highlighting"
#endif
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