T.P.Writers.Shared: add new function `removeLinks`.

The function converts links to spans. It is used, for example, to avoid
nested links.

The HTML writer used to put the description of nested links into small
caps, but uses a simple *span* now.

3 files changed, 14 insertions, 18 deletions

diff --git a/src/Text/Pandoc/Writers/HTML.hs b/src/Text/Pandoc/Writers/HTML.hs
index bf01f663b..12444f75f 100644
--- a/src/Text/Pandoc/Writers/HTML.hs
+++ b/src/Text/Pandoc/Writers/HTML.hs
@@ -1548,6 +1548,9 @@ inlineToHtml opts inline = do
              _ -> do report $ InlineNotRendered inline
                      return mempty
     (Link attr txt (s,_)) | "mailto:" `T.isPrefixOf` s -> do
+                        -- We need to remove links from link text, because an
+                        -- <a> element is not allowed inside another <a>
+                        -- element.
                         linkText <- inlineListToHtml opts (removeLinks txt)
                         obfuscateLink opts attr linkText s
     (Link (ident,classes,kvs) txt (s,tit)) -> do
@@ -1768,15 +1771,6 @@ isSlideVariant :: Format -> Bool
 isSlideVariant f = f `elem` [Format "s5", Format "slidy", Format "slideous",
                              Format "dzslides", Format "revealjs"]
 
-
--- We need to remove links from link text, because an <a> element is
--- not allowed inside another <a> element.
-removeLinks :: [Inline] -> [Inline]
-removeLinks = walk go
- where
-  go (Link attr ils _) = Span attr ils
-  go x = x
-
 toURI :: Bool -> Text -> Text
 toURI isHtml5 t = if isHtml5 then t else escapeURI t
  where
diff --git a/src/Text/Pandoc/Writers/MediaWiki.hs b/src/Text/Pandoc/Writers/MediaWiki.hs
index 2991e4ebc..d85354756 100644
--- a/src/Text/Pandoc/Writers/MediaWiki.hs
+++ b/src/Text/Pandoc/Writers/MediaWiki.hs
@@ -26,7 +26,6 @@ import Text.Pandoc.Definition
 import Text.Pandoc.ImageSize
 import Text.Pandoc.Logging
 import Text.Pandoc.Options
-import Text.Pandoc.Walk
 import Text.DocLayout (render, literal)
 import Text.Pandoc.Shared
 import Text.Pandoc.URI
@@ -484,6 +483,8 @@ inlineToMediaWiki SoftBreak = do
 inlineToMediaWiki Space = return " "
 
 inlineToMediaWiki (Link _ txt (src, _)) = do
+  -- We need to remove links from link text, because an <a> element is
+  -- not allowed inside another <a> element.
   label <- inlineListToMediaWiki (removeLinks txt)
   case txt of
      [Str s] | isURI src && escapeURI s == src -> return src
@@ -518,14 +519,6 @@ inlineToMediaWiki (Note contents) = do
   return $ "<ref>" <> stripTrailingNewlines contents' <> "</ref>"
   -- note - does not work for notes with multiple blocks
 
--- We need to remove links from link text, because an <a> element is
--- not allowed inside another <a> element.
-removeLinks :: [Inline] -> [Inline]
-removeLinks = walk go
- where
-  go (Link _ ils _) = SmallCaps ils
-  go x = x
-
 highlightingLangs :: Set.Set Text
 highlightingLangs = Set.fromList [
   "abap",
diff --git a/src/Text/Pandoc/Writers/Shared.hs b/src/Text/Pandoc/Writers/Shared.hs
index aff1520f1..9d71f2fb3 100644
--- a/src/Text/Pandoc/Writers/Shared.hs
+++ b/src/Text/Pandoc/Writers/Shared.hs
@@ -45,6 +45,7 @@ module Text.Pandoc.Writers.Shared (
                      , toLegacyTable
                      , splitSentences
                      , ensureValidXmlIdentifiers
+                     , removeLinks
                      , setupTranslations
                      , isOrderedListMarker
                      , toTaskListItem
@@ -805,6 +806,14 @@ walkAttr f = walk goInline . walk goBlock
   goBlock (Div attr bs) = Div (f attr) bs
   goBlock x = x
 
+-- | Convert links to spans; most useful when writing elements that must not
+-- contain links, e.g. to avoid nested links.
+removeLinks :: [Inline] -> [Inline]
+removeLinks = walk go
+ where
+  go (Link attr ils _) = Span attr ils
+  go x = x
+
 -- | Set translations based on the `lang` in metadata.
 setupTranslations :: PandocMonad m => Meta -> m ()
 setupTranslations meta = do