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-rw-r--r--Text/Pandoc/Highlighting.hs64
1 files changed, 64 insertions, 0 deletions
diff --git a/Text/Pandoc/Highlighting.hs b/Text/Pandoc/Highlighting.hs
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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 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