Added skeleton of basic docbook reader.

2 files changed, 37 insertions, 1 deletions

diff --git a/src/Text/Pandoc/Pretty.hs b/src/Text/Pandoc/Pretty.hs
index bf78b2594..3cabcb75b 100644
--- a/src/Text/Pandoc/Pretty.hs
+++ b/src/Text/Pandoc/Pretty.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE GeneralizedNewtypeDeriving #-}
+{-# LANGUAGE GeneralizedNewtypeDeriving, DatatypeContexts #-}
 {-
 Copyright (C) 2010 John MacFarlane <jgm@berkeley.edu>
 
diff --git a/src/Text/Pandoc/Readers/DocBook.hs b/src/Text/Pandoc/Readers/DocBook.hs
new file mode 100644
index 000000000..73a2e6abc
--- /dev/null
+++ b/src/Text/Pandoc/Readers/DocBook.hs
@@ -0,0 +1,36 @@
+module Text.Pandoc.Readers.DocBook ( readDocBook ) where
+import Text.Pandoc.Parsing (ParserState(..), defaultParserState)
+import Text.Pandoc.Definition
+import Text.Pandoc.Builder
+import Text.XML.Light
+import Data.Monoid
+import Data.Char (isSpace)
+
+readDocBook :: ParserState -> String -> Pandoc
+readDocBook st inp = Pandoc (Meta [] [] []) $ toList blocks
+  where blocks = mconcat $ map (parseBlock st) $ parseXML inp
+
+parseBlock :: ParserState -> Content -> Blocks
+parseBlock st (Text (CData _ s _)) = if all isSpace s
+                                        then mempty
+                                        else plain $ text s
+parseBlock st (Elem e) =
+  case qName (elName e) of
+        "para" -> para $ trimInlines $ mconcat
+                       $ map (parseInline st) $ elContent e
+        _      -> mconcat $ map (parseBlock st) $ elContent e
+parseBlock st (CRef _) = mempty
+
+parseInline :: ParserState -> Content -> Inlines
+parseInline st (Text (CData _ s _)) = text s
+parseInline st (Elem e) =
+  case qName (elName e) of
+        "emphasis" -> case lookupAttrBy (\attr -> qName attr == "role")
+                           (elAttribs e) of
+                             Just "strong" -> strong innerInlines
+                             _             -> emph innerInlines
+        _          -> innerInlines
+   where innerInlines = trimInlines . mconcat . map (parseInline st)
+                        $ elContent e
+parseInline st (CRef _) = mempty
+