Added `native_divs` and `native_spans` extensions.

This allows users to turn off the default pandoc behavior of
parsing contents of div and span tags in markdown and HTML
as native pandoc Div blocks and Span inlines.

Setting of default epub extensions has been moved from the EPUB
reader to Text.Pandoc.

4 files changed, 13 insertions, 10 deletions

diff --git a/src/Text/Pandoc/Options.hs b/src/Text/Pandoc/Options.hs
index bb213bac0..84ccbbdc9 100644
--- a/src/Text/Pandoc/Options.hs
+++ b/src/Text/Pandoc/Options.hs
@@ -77,6 +77,8 @@ data Extension =
     | Ext_backtick_code_blocks    -- ^ Github style ``` code blocks
     | Ext_inline_code_attributes  -- ^ Allow attributes on inline code
     | Ext_markdown_in_html_blocks -- ^ Interpret as markdown inside HTML blocks
+    | Ext_native_divs             -- ^ Use Div blocks for contents of <div> tags
+    | Ext_native_spans            -- ^ Use Span inlines for contents of <span>
     | Ext_markdown_attribute      -- ^ Interpret text inside HTML as markdown
                                   --   iff container has attribute 'markdown'
     | Ext_escaped_line_breaks     -- ^ Treat a backslash at EOL as linebreak
@@ -131,6 +133,8 @@ pandocExtensions = Set.fromList
   , Ext_backtick_code_blocks
   , Ext_inline_code_attributes
   , Ext_markdown_in_html_blocks
+  , Ext_native_divs
+  , Ext_native_spans
   , Ext_escaped_line_breaks
   , Ext_fancy_lists
   , Ext_startnum
diff --git a/src/Text/Pandoc/Readers/EPUB.hs b/src/Text/Pandoc/Readers/EPUB.hs
index 968b815c0..7462b3711 100644
--- a/src/Text/Pandoc/Readers/EPUB.hs
+++ b/src/Text/Pandoc/Readers/EPUB.hs
@@ -13,8 +13,7 @@ import Text.Pandoc.Definition hiding (Attr)
 import Text.Pandoc.Walk (walk, query)
 import Text.Pandoc.Generic(bottomUp)
 import Text.Pandoc.Readers.HTML (readHtml)
-import Text.Pandoc.Options ( ReaderOptions(..), readerExtensions, Extension(..)
-                           , readerTrace)
+import Text.Pandoc.Options ( ReaderOptions(..), readerTrace)
 import Text.Pandoc.Shared (escapeURI)
 import Text.Pandoc.MediaBag (MediaBag, insertMedia)
 import Text.Pandoc.Compat.Except (MonadError, throwError, runExcept, Except)
@@ -32,7 +31,6 @@ import Data.Monoid (mempty, (<>))
 import Data.List (isPrefixOf, isInfixOf)
 import Data.Maybe (mapMaybe, fromMaybe)
 import qualified Data.Map as M (Map, lookup, fromList, elems)
-import qualified Data.Set as S (insert)
 import Control.DeepSeq.Generics (deepseq, NFData)
 
 import Debug.Trace (trace)
@@ -65,9 +63,7 @@ archiveToEPUB os archive = do
   let mediaBag = fetchImages (M.elems items) root archive ast
   return $ (ast, mediaBag)
   where
-    rs = readerExtensions os
-    os' = os {readerExtensions = foldr S.insert rs [Ext_epub_html_exts, Ext_raw_html]}
-    os'' = os' {readerParseRaw = True}
+    os' = os {readerParseRaw = True}
     parseSpineElem :: MonadError String m => FilePath -> (FilePath, MIME) -> m Pandoc
     parseSpineElem (normalise -> r) (normalise -> path, mime) = do
       when (readerTrace os) (traceM path)
@@ -78,7 +74,7 @@ archiveToEPUB os archive = do
     mimeToReader "application/xhtml+xml" r path = do
       fname <- findEntryByPathE (r </> path) archive
       return $ fixInternalReferences (r </> path) .
-                readHtml os'' .
+                readHtml os' .
                   UTF8.toStringLazy $
                     fromEntry fname
     mimeToReader s _ path
diff --git a/src/Text/Pandoc/Readers/HTML.hs b/src/Text/Pandoc/Readers/HTML.hs
index 3d988cd80..1789b865f 100644
--- a/src/Text/Pandoc/Readers/HTML.hs
+++ b/src/Text/Pandoc/Readers/HTML.hs
@@ -45,7 +45,8 @@ import Text.Pandoc.Builder (Blocks, Inlines, trimInlines, HasMeta(..))
 import Text.Pandoc.Shared ( extractSpaces, renderTags'
                           , escapeURI, safeRead )
 import Text.Pandoc.Options (ReaderOptions(readerParseRaw, readerTrace)
-                           , Extension (Ext_epub_html_exts))
+                           , Extension (Ext_epub_html_exts,
+                               Ext_native_divs, Ext_native_spans))
 import Text.Pandoc.Parsing hiding ((<|>))
 import Text.Pandoc.Walk
 import Data.Maybe ( fromMaybe, isJust)
@@ -296,6 +297,7 @@ pRawTag = do
 
 pDiv :: TagParser Blocks
 pDiv = try $ do
+  guardEnabled Ext_native_divs
   TagOpen _ attr <- lookAhead $ pSatisfy $ tagOpen (=="div") (const True)
   contents <- pInTags "div" block
   return $ B.divWith (mkAttr attr) contents
@@ -560,6 +562,7 @@ pCode = try $ do
 
 pSpan :: TagParser Inlines
 pSpan = try $ do
+  guardEnabled Ext_native_spans
   TagOpen _ attr <- lookAhead $ pSatisfy $ tagOpen (=="span") (const True)
   contents <- pInTags "span" inline
   return $ B.spanWith (mkAttr attr) contents
diff --git a/src/Text/Pandoc/Readers/Markdown.hs b/src/Text/Pandoc/Readers/Markdown.hs
index 04b3fa684..861f81b23 100644
--- a/src/Text/Pandoc/Readers/Markdown.hs
+++ b/src/Text/Pandoc/Readers/Markdown.hs
@@ -1764,7 +1764,7 @@ inBrackets parser = do
 
 spanHtml :: MarkdownParser (F Inlines)
 spanHtml = try $ do
-  guardEnabled Ext_markdown_in_html_blocks
+  guardEnabled Ext_native_spans
   (TagOpen _ attrs, _) <- htmlTag (~== TagOpen "span" [])
   contents <- mconcat <$> manyTill inline (htmlTag (~== TagClose "span"))
   let ident = fromMaybe "" $ lookup "id" attrs
@@ -1779,7 +1779,7 @@ spanHtml = try $ do
 
 divHtml :: MarkdownParser (F Blocks)
 divHtml = try $ do
-  guardEnabled Ext_markdown_in_html_blocks
+  guardEnabled Ext_native_divs
   (TagOpen _ attrs, rawtag) <- htmlTag (~== TagOpen "div" [])
   -- we set stateInHtmlBlock so that closing tags that can be either block or
   -- inline will not be parsed as inline tags