Docx reader: Handle Alt text and titles in images.

We use the "description" field as alt text and the "title" field as
title. These can be accessed through the "Format Picture" dialog in
Word.

src/Text/Pandoc/Readers/Docx.hs

@@ -317,10 +317,10 @@ runToInlines (Footnote bps) = do
 runToInlines (Endnote bps) = do
   blksList <- smushBlocks <$> (mapM bodyPartToBlocks bps)
   return $ note blksList
-runToInlines (InlineDrawing fp bs ext) = do
+runToInlines (InlineDrawing fp title alt bs ext) = do
   mediaBag <- gets docxMediaBag
   modify $ \s -> s { docxMediaBag = insertMedia fp Nothing bs mediaBag }
-  return $ imageWith (extentToAttr ext) fp "" ""
+  return $ imageWith (extentToAttr ext) fp title $ text alt
 
 extentToAttr :: Extent -> Attr
 extentToAttr (Just (w, h)) =
@@ -401,10 +401,10 @@ parPartToInlines (BookMark _ anchor) =
     unless inHdrBool
       (modify $ \s -> s { docxAnchorMap = M.insert anchor newAnchor anchorMap})
     return $ spanWith (newAnchor, ["anchor"], []) mempty
-parPartToInlines (Drawing fp bs ext) = do
+parPartToInlines (Drawing fp title alt bs ext) = do
   mediaBag <- gets docxMediaBag
   modify $ \s -> s { docxMediaBag = insertMedia fp Nothing bs mediaBag }
-  return $ imageWith (extentToAttr ext) fp "" ""
+  return $ imageWith (extentToAttr ext) fp title $ text alt
 parPartToInlines (InternalHyperLink anchor runs) = do
   ils <- smushInlines <$> mapM runToInlines runs
   return $ link ('#' : anchor) "" ils

src/Text/Pandoc/Readers/Docx/Parse.hs

@@ -215,14 +215,14 @@ data ParPart = PlainRun Run
              | BookMark BookMarkId Anchor
              | InternalHyperLink Anchor [Run]
              | ExternalHyperLink URL [Run]
-             | Drawing FilePath B.ByteString Extent
+             | Drawing FilePath String String B.ByteString Extent -- title, alt
              | PlainOMath [Exp]
              deriving Show
 
 data Run = Run RunStyle [RunElem]
          | Footnote [BodyPart]
          | Endnote [BodyPart]
-         | InlineDrawing FilePath B.ByteString Extent
+         | InlineDrawing FilePath String String B.ByteString Extent -- title, alt
            deriving Show
 
 data RunElem = TextRun String | LnBrk | Tab | SoftHyphen | NoBreakHyphen
@@ -649,12 +649,20 @@ elemToParPart :: NameSpaces -> Element -> D ParPart
 elemToParPart ns element
   | isElem ns "w" "r" element
   , Just drawingElem <- findChild (elemName ns "w" "drawing") element =
-    let a_ns = "http://schemas.openxmlformats.org/drawingml/2006/main"
+    let mbDocPr = findChild (elemName ns "wp" "inline") drawingElem >>=
+                  findChild (elemName ns "wp" "docPr")
+        alt = case mbDocPr >>= findAttr (elemName ns "" "descr") of
+                Just alt' -> alt'
+                Nothing   -> ""
+        title = case mbDocPr >>= findAttr (elemName ns "" "title") of
+                Just title' -> title'
+                Nothing     -> ""
+        a_ns = "http://schemas.openxmlformats.org/drawingml/2006/main"
         drawing = findElement (QName "blip" (Just a_ns) (Just "a")) element
                   >>= findAttr (elemName ns "r" "embed")
     in
      case drawing of
-       Just s -> expandDrawingId s >>= (\(fp, bs) -> return $ Drawing fp bs $ elemToExtent drawingElem)
+       Just s -> expandDrawingId s >>= (\(fp, bs) -> return $ Drawing fp title alt bs $ elemToExtent drawingElem)
        Nothing -> throwError WrongElem
 -- The below is an attempt to deal with images in deprecated vml format.
 elemToParPart ns element
@@ -664,7 +672,8 @@ elemToParPart ns element
                   >>= findAttr (elemName ns "r" "id")
     in
      case drawing of
-       Just s -> expandDrawingId s >>= (\(fp, bs) -> return $ Drawing fp bs Nothing)
+       -- Todo: check out title and attr for deprecated format.
+       Just s -> expandDrawingId s >>= (\(fp, bs) -> return $ Drawing fp "" "" bs Nothing)
        Nothing -> throwError WrongElem
 elemToParPart ns element
   | isElem ns "w" "r" element =
@@ -751,13 +760,21 @@ elemToExtent drawingElem =
 childElemToRun :: NameSpaces -> Element -> D Run
 childElemToRun ns element
   | isElem ns "w" "drawing" element =
-    let a_ns = "http://schemas.openxmlformats.org/drawingml/2006/main"
+    let mbDocPr = findChild (elemName ns "wp" "inline") element >>=
+                  findChild (elemName ns "wp" "docPr")
+        alt = case mbDocPr >>= findAttr (elemName ns "" "descr") of
+                Just alt' -> alt'
+                Nothing   -> ""
+        title = case mbDocPr >>= findAttr (elemName ns "" "title") of
+                Just title' -> title'
+                Nothing     -> ""
+        a_ns = "http://schemas.openxmlformats.org/drawingml/2006/main"
         drawing = findElement (QName "blip" (Just a_ns) (Just "a")) element
                   >>= findAttr (QName "embed" (lookup "r" ns) (Just "r"))
     in
      case drawing of
        Just s -> expandDrawingId s >>=
-                 (\(fp, bs) -> return $ InlineDrawing fp bs $ elemToExtent element)
+                 (\(fp, bs) -> return $ InlineDrawing fp title alt bs $ elemToExtent element)
        Nothing -> throwError WrongElem
 childElemToRun ns element
   | isElem ns "w" "footnoteReference" element