From b40d33b174d11c5f5b9b3011a3a3b6da42d5be20 Mon Sep 17 00:00:00 2001
From: mb21 <mb21@users.noreply.github.com>
Date: Sat, 17 Jan 2015 17:28:19 +0100
Subject: fixes #1859 HTML Reader table parsing

---
 src/Text/Pandoc/Readers/HTML.hs | 33 ++++++++++++++++++++++-----------
 1 file changed, 22 insertions(+), 11 deletions(-)

(limited to 'src/Text/Pandoc/Readers/HTML.hs')

diff --git a/src/Text/Pandoc/Readers/HTML.hs b/src/Text/Pandoc/Readers/HTML.hs
index 2a23f2a62..02ff07e73 100644
--- a/src/Text/Pandoc/Readers/HTML.hs
+++ b/src/Text/Pandoc/Readers/HTML.hs
@@ -374,12 +374,20 @@ pTable = try $ do
   caption <- option mempty $ pInTags "caption" inline <* skipMany pBlank
   -- TODO actually read these and take width information from them
   widths' <- pColgroup <|> many pCol
-  head' <- option [] $ pOptInTag "thead" $ pInTags "tr" (pCell "th")
-  skipMany pBlank
-  rows <- pOptInTag "tbody"
-          $ many1 $ try $ skipMany pBlank >> pInTags "tr" (pCell "td")
-  skipMany pBlank
+  let pTh = option [] $ pInTags "tr" (pCell "th")
+      pTr = try $ skipMany pBlank >> pInTags "tr" (pCell "td" <|> pCell "th")
+      pTBody = do pOptInTag "tbody" $ many1 pTr
+  head'' <- pOptInTag "thead" pTh
+  head'  <- pOptInTag "tbody" $ do
+              if null head''
+                 then pTh
+                 else return head''
+  rowsLs <- many pTBody
+  rows'  <- pOptInTag "tfoot" $ many pTr
   TagClose _ <- pSatisfy (~== TagClose "table")
+  let rows = (concat rowsLs) ++ rows'
+  -- fail on empty table
+  guard $ not $ null head' && null rows
   let isSinglePlain x = case B.toList x of
                              [Plain _] -> True
                              _         -> False
@@ -624,14 +632,17 @@ pInTags tagtype parser = try $ do
   pSatisfy (~== TagOpen tagtype [])
   mconcat <$> manyTill parser (pCloses tagtype <|> eof)
 
-pOptInTag :: String -> TagParser a
-          -> TagParser a
-pOptInTag tagtype parser = try $ do
-  open <- option False (pSatisfy (~== TagOpen tagtype []) >> return True)
+-- parses p, preceeded by an optional opening tag
+-- and followed by an optional closing tags
+pOptInTag :: String -> TagParser a -> TagParser a
+pOptInTag tagtype p = try $ do
+  skipMany pBlank
+  optional $ pSatisfy (~== TagOpen tagtype [])
+  skipMany pBlank
+  x <- p
   skipMany pBlank
-  x <- parser
+  optional $ pSatisfy (~== TagClose tagtype)
   skipMany pBlank
-  when open $ pCloses tagtype
   return x
 
 pCloses :: String -> TagParser ()
-- 
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