From 33a29fbf8720c0d7eec40b7014e3f819b05474ef Mon Sep 17 00:00:00 2001
From: John MacFarlane <jgm@berkeley.edu>
Date: Tue, 27 Jun 2017 15:03:16 +0200
Subject: RST reader:  support anchors.

E.g.

    `hello`

    .. _hello:

    paragraph

This is supported by putting "paragraph" in a Div with
id `hello`.

Closes #262.
---
 src/Text/Pandoc/Readers/RST.hs | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

(limited to 'src/Text/Pandoc')

diff --git a/src/Text/Pandoc/Readers/RST.hs b/src/Text/Pandoc/Readers/RST.hs
index c790d5188..2daf60a89 100644
--- a/src/Text/Pandoc/Readers/RST.hs
+++ b/src/Text/Pandoc/Readers/RST.hs
@@ -170,7 +170,8 @@ parseRST = do
   -- go through once just to get list of reference keys and notes
   -- docMinusKeys is the raw document with blanks where the keys were...
   docMinusKeys <- concat <$>
-                  manyTill (referenceKey <|> noteBlock <|> citationBlock <|>
+                  manyTill (referenceKey <|> anchorDef <|>
+                            noteBlock <|> citationBlock <|>
                             headerBlock <|> lineClump) eof
   setInput docMinusKeys
   setPosition startPos
@@ -217,6 +218,7 @@ block = choice [ codeBlock
                , fieldList
                , include
                , directive
+               , anchor
                , comment
                , header
                , hrule
@@ -1072,12 +1074,32 @@ regularKey = try $ do
   -- .. _goodbye: url.com
   refs <- referenceNames
   src <- targetURI
+  guard $ not (null src)
   --TODO: parse width, height, class and name attributes
   let keys = map (toKey . stripTicks) refs
   forM_ keys $ \key ->
     updateState $ \s -> s { stateKeys = M.insert key ((src,""), nullAttr) $
                             stateKeys s }
 
+anchorDef :: PandocMonad m => RSTParser m [Char]
+anchorDef = try $ do
+  (refs, raw) <- withRaw (try (referenceNames <* blanklines))
+  let keys = map stripTicks refs
+  forM_ keys $ \rawkey ->
+    updateState $ \s -> s { stateKeys =
+       M.insert (toKey rawkey) (('#':rawkey,""), nullAttr) $ stateKeys s }
+  -- keep this for 2nd round of parsing, where we'll add the divs (anchor)
+  return raw
+
+anchor :: PandocMonad m => RSTParser m Blocks
+anchor = try $ do
+  refs <- referenceNames
+  blanklines
+  b <- block
+  -- put identifier on next block:
+  let addDiv ref = B.divWith (ref, [], [])
+  return $ foldr addDiv b refs
+
 headerBlock :: PandocMonad m => RSTParser m [Char]
 headerBlock = do
   ((txt, _), raw) <- withRaw (doubleHeader' <|> singleHeader')
-- 
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