Added skeleton of basic docbook reader.

pandoc.cabal

@@ -246,6 +246,7 @@ Library
                    Text.Pandoc.Readers.LaTeX,
                    Text.Pandoc.Readers.Markdown,
                    Text.Pandoc.Readers.RST,
+                   Text.Pandoc.Readers.DocBook,
                    Text.Pandoc.Readers.TeXMath,
                    Text.Pandoc.Readers.Textile,
                    Text.Pandoc.Readers.Native,

src/Text/Pandoc.hs

@@ -119,6 +119,7 @@ import Text.Pandoc.Definition
 import Text.Pandoc.Generic
 import Text.Pandoc.Readers.Markdown
 import Text.Pandoc.Readers.RST
+import Text.Pandoc.Readers.DocBook
 import Text.Pandoc.Readers.LaTeX
 import Text.Pandoc.Readers.HTML
 import Text.Pandoc.Readers.Textile
@@ -162,6 +163,7 @@ readers = [("native"       , \_ -> readNative)
           ,("rst"          , readRST)
           ,("rst+lhs"      , \st ->
                              readRST st{ stateLiterateHaskell = True})
+          ,("docbook"      , readDocBook)
           ,("textile"      , readTextile) -- TODO : textile+lhs 
           ,("html"         , readHtml)
           ,("latex"        , readLaTeX)

src/Text/Pandoc/Pretty.hs

@@ -1,4 +1,4 @@
-{-# LANGUAGE GeneralizedNewtypeDeriving #-}
+{-# LANGUAGE GeneralizedNewtypeDeriving, DatatypeContexts #-}
 {-
 Copyright (C) 2010 John MacFarlane <jgm@berkeley.edu>
 

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
+