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Diffstat (limited to 'Text')
-rw-r--r-- | Text/Pandoc/Highlighting.hs | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/Text/Pandoc/Highlighting.hs b/Text/Pandoc/Highlighting.hs new file mode 100644 index 000000000..6fcb9cb8b --- /dev/null +++ b/Text/Pandoc/Highlighting.hs @@ -0,0 +1,64 @@ +{-# 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 lang -> case highlightAs lang rawCode of + Left err -> Left err + Right hl -> Right $ formatAsXHtml fmtOpts lang 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 |