LaTeX writer: fix bug with big footnotes inside emphasis (#9168)

Closes #8982.

src/Text/Pandoc/Writers/LaTeX.hs

@@ -64,11 +64,39 @@ import Text.Pandoc.Writers.LaTeX.Util (stringToLaTeX, StringContext(..),
                                        getListingsLanguage, mbBraced)
 import Text.Pandoc.Writers.Shared
 import qualified Text.Pandoc.Writers.AnnotatedTable as Ann
+-- Work around problems with notes inside emphasis (see #8982)
+
+isolateBigNotes :: ([Inline] -> Inline) -> [Inline] -> [Inline]
+isolateBigNotes constructor xs =
+  let (before, after) = break isBigNote xs
+  in case after of
+       (noteInline:rest) -> constructor before :
+                            noteInline :
+                            isolateBigNotes constructor rest
+       [] -> [constructor xs]
+  where
+    isBigNote :: Inline -> Bool
+    isBigNote (Note [Plain _]) = False  -- A small note
+    isBigNote (Note [Para _]) =  False  -- A small note
+    isBigNote (Note _) = True  -- A big note
+    isBigNote _ = False  -- Not a note
+
+raiseBigNotes :: [Inline] -> [Inline]
+raiseBigNotes (Emph inner : xs)
+  = isolateBigNotes Emph (raiseBigNotes inner) ++ raiseBigNotes xs
+raiseBigNotes (Strong inner : xs)
+  = isolateBigNotes Strong (raiseBigNotes inner) ++ raiseBigNotes xs
+raiseBigNotes (Underline inner : xs)
+  = isolateBigNotes Underline (raiseBigNotes inner) ++ raiseBigNotes xs
+raiseBigNotes (Strikeout inner : xs)
+  = isolateBigNotes Strikeout (raiseBigNotes inner) ++ raiseBigNotes xs
+raiseBigNotes (x : xs)          = x : raiseBigNotes xs
+raiseBigNotes [] = []
 
 -- | Convert Pandoc to LaTeX.
 writeLaTeX :: PandocMonad m => WriterOptions -> Pandoc -> m Text
 writeLaTeX options document =
-  evalStateT (pandocToLaTeX options document) $
+  evalStateT (pandocToLaTeX options (walk raiseBigNotes document)) $
     startingState options
 
 -- | Convert Pandoc to LaTeX Beamer.

test/Tests/Writers/LaTeX.hs

@@ -86,6 +86,74 @@ tests = [ testGroup "code blocks"
           , "backtick" =:
               code "`nu?`" =?> "\\texttt{\\textasciigrave{}nu?\\textasciigrave{}}"
           ]
+        , testGroup "inline note"
+          [ "Big note in emph" =:
+              emph (str "This sentence"
+                    <> note (para (str "paragraph1")
+                             <> para (str "paragraph2"))
+                    <> str " has footnote.")
+              =?>
+                 "\\emph{This sentence}\\footnote{paragraph1\n\n  paragraph2}"
+                 <> "\\emph{ has footnote.}"
+           , "Big note in strong" =:
+              strong (str "This sentence"
+                      <> note (para (str "paragraph1")
+                               <> para (str "paragraph2"))
+                      <> str " has footnote.")
+              =?>
+                 "\\textbf{This sentence}\\footnote{paragraph1\n\n  paragraph2}"
+                 <> "\\textbf{ has footnote.}"
+
+           , "Big note in underline" =:
+              underline (str "This sentence"
+                         <> note (para (str "paragraph1")
+                                  <> para (str "paragraph2"))
+                         <> str " has footnote.")
+              =?>
+                 "\\ul{This sentence}\\footnote{paragraph1\n\n  paragraph2}"
+                 <> "\\ul{ has footnote.}"
+
+           , "Big note in strikeout" =:
+              strikeout (str "This sentence"
+                         <> note (para (str "paragraph1")
+                                  <> para (str "paragraph2"))
+                         <> str " has footnote.")
+              =?>
+                 "\\st{This sentence}\\footnote{paragraph1\n\n  paragraph2}"
+                 <> "\\st{ has footnote.}"
+
+           , "Small note in emph" =:
+              emph (str "This sentence"
+                    <> note (para (str "paragraph"))
+                    <> str " has footnote.")
+              =?>
+                 "\\emph{This sentence\\footnote{paragraph} has footnote.}"
+
+           , "Big note nested in emph and strong" =:
+              emph (str "This "
+                    <> strong (str "nested sentence "
+                               <> note (para (str "paragraph1")
+                                        <> para (str "paragraph2"))
+                               <> str "has ")
+                    <> str "footnote."
+              )
+              =?>
+                 "\\emph{This \\textbf{nested sentence }}\\footnote{paragraph1\n\n"
+                 <> "  paragraph2}\\emph{\\textbf{has }footnote.}"
+
+          , "Two Big notes in emph" =:
+              emph (str "This sentence"
+                    <> note (para (str "1-paragraph1")
+                             <> para (str "1-paragraph2"))
+                    <> str " has"
+                    <> note (para (str "2-paragraph1")
+                             <> para (str "2-paragraph2"))
+                    <> str " footnote.")
+              =?>
+                 "\\emph{This sentence}\\footnote{1-paragraph1\n\n  1-paragraph2}"
+                 <> "\\emph{ has}\\footnote{2-paragraph1\n\n  2-paragraph2}"
+                 <> "\\emph{ footnote.}"
+          ]
         , testGroup "writer options"
           [ testGroup "top-level division" $
             let