parse RST quoted literal blocks

closes #65
RST quoted literal blocks are the same as indented literal blocks (which
pandoc already supports) except that the quote character is preserved in
each line.

This includes test cases for the quoted literal block, as well as
additional tests for line blocks and indented literal blocks, to verify
that these are unaffected by the changes.

src/Text/Pandoc/Readers/RST.hs

@@ -335,6 +335,13 @@ indentedBlock = try $ do
   optional blanklines
   return $ unlines lns
 
+quotedBlock :: Parser [Char] st [Char]
+quotedBlock = try $ do
+    quote <- lookAhead $ oneOf "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~"
+    lns <- many1 $ lookAhead (char quote) >> anyLine
+    optional blanklines
+    return $ unlines lns
+
 codeBlockStart :: Parser [Char] st Char
 codeBlockStart = string "::" >> blankline >> blankline
 
@@ -342,7 +349,8 @@ codeBlock :: Parser [Char] st Blocks
 codeBlock = try $ codeBlockStart >> codeBlockBody
 
 codeBlockBody :: Parser [Char] st Blocks
-codeBlockBody = try $ B.codeBlock . stripTrailingNewlines <$> indentedBlock
+codeBlockBody = try $ B.codeBlock . stripTrailingNewlines <$>
+                (indentedBlock <|> quotedBlock)
 
 lhsCodeBlock :: RSTParser Blocks
 lhsCodeBlock = try $ do

tests/Tests/Readers/RST.hs

@@ -67,5 +67,20 @@ tests = [ "line block with blank line" =:
                 link "http://foo.bar.baz" "" "http://foo.bar.baz" <> ". " <>
                 link "http://foo.bar/baz_(bam)" "" "http://foo.bar/baz_(bam)"
                 <> " (" <> link "http://foo.bar" "" "http://foo.bar" <> ")")
+        , "indented literal block" =: unlines
+          [ "::"
+          , ""
+          , "  block quotes"
+          , ""
+          , "  can go on for many lines"
+          , "but must stop here"]
+          =?> (doc $
+           codeBlock "block quotes\n\ncan go on for many lines" <>
+           para "but must stop here")
+        , "line block with 3 lines" =: "| a\n| b\n| c"
+          =?> para ("a" <> linebreak <>  "b" <> linebreak <> "c")
+          , "quoted literal block using >" =: "::\n\n> quoted\n> block\n\nOrdinary paragraph"
+            =?> codeBlock "> quoted\n> block" <> para "Ordinary paragraph"
+          , "quoted literal block using | (not  a line block)" =: "::\n\n| quoted\n| block\n\nOrdinary paragraph"
+            =?> codeBlock "| quoted\n| block" <> para "Ordinary paragraph"
         ]
-