Improved handling of raw HTML in Markdown reader. (Resolves Issue #36.)

Tags that can be either block or inline (e.g. <ins>) should be treated
as block when appropriate and as inline when appropriate.  Thus, for
example,
  <ins>hi</ins>
should be treated as a paragraph with inline <ins> tags, while
  <ins>

  hi

  </ins>
should be treated as a paragraph within <ins> tags.
+ Moved htmlBlock after para in list of block parsers.  This ensures
  that tags that can be either block or inline get parsed as inline
  when appropriate.
+ Modified rawHtmlInline' so that block elements aren't treated as inline.
+ Modified para parser so that paragraphs containing only HTML tags and
  blank space are not allowed.  Treat these as raw HTML blocks instead.


git-svn-id: https://pandoc.googlecode.com/svn/trunk@1154 788f1e2b-df1e-0410-8736-df70ead52e1b

Text/Pandoc/Readers/Markdown.hs

@@ -235,9 +235,9 @@ block = choice [ header
                , hrule
                , list
                , blockQuote
-               , htmlBlock
                , rawLaTeXEnvironment'
                , para
+               , htmlBlock
                , plain
                , nullBlock ] <?> "block"
 
@@ -448,8 +448,16 @@ definitionList = do
 -- paragraph block
 --
 
+isHtmlOrBlank (HtmlInline _) = True
+isHtmlOrBlank (Space) = True
+isHtmlOrBlank (LineBreak) = True
+isHtmlOrBlank _ = False
+
 para = try $ do 
   result <- many1 inline
+  if all isHtmlOrBlank result
+     then fail "treat as raw HTML"
+     else return ()
   newline
   blanklines <|> do st <- getState
                     if stateStrict st
@@ -886,8 +894,8 @@ rawLaTeXInline' = failIfStrict >> rawLaTeXInline
 
 rawHtmlInline' = do
   st <- getState
-  result <- choice $ if stateStrict st
-                        then [htmlBlockElement, anyHtmlTag, anyHtmlEndTag] 
-                        else [htmlBlockElement, anyHtmlInlineTag]
+  result <- if stateStrict st
+               then choice [htmlBlockElement, anyHtmlTag, anyHtmlEndTag] 
+               else anyHtmlInlineTag
   return $ HtmlInline result