File 2266-emd2exml-Clean-emphasis-markers-in-link-texts.patch of Package erlang

From 0ed9f0d4cdd2e267ce14f2e4e7aa6286876dbfca Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Tue, 2 Apr 2019 07:40:06 +0200
Subject: [PATCH 06/11] emd2exml: Clean emphasis markers in link texts

Our DTD does not allow any nested tags in link texts.
---
 make/emd2exml.in | 30 +++++++++++++++++++++++++-----
 1 file changed, 25 insertions(+), 5 deletions(-)

diff --git a/make/emd2exml.in b/make/emd2exml.in
index 0d14b961a6..cf53cec155 100755
--- a/make/emd2exml.in
+++ b/make/emd2exml.in
@@ -462,7 +462,7 @@ url([C|Cs], Bool, Acc) ->
     url(Cs, Bool, [C|Acc]).
 
 link_or_image(Str, Type) ->
-    case link_or_image_text(Str, "") of
+    case link_or_image_text(Str) of
  	no -> no;
 	{Text, Cont1} ->
 	    case link_or_image_data(Cont1, none, Type, "", "") of
@@ -495,16 +495,36 @@ internal_seealso("#" ++ Marker) ->
 internal_seealso(_) ->
     no.
 
+link_or_image_text(Cs0) ->
+    {Prefix, Cs2} = case Cs0 of
+                        "__" ++ Cs1 -> {"__", Cs1};
+                        "_"  ++ Cs1 -> {"_", Cs1};
+                        "**" ++ Cs1 -> {"**", Cs1};
+                        "*"  ++ Cs1 -> {"*", Cs1};
+                        Cs1 -> {"", Cs1}
+                    end,
+    {Text0, Cs} = link_or_image_text(Cs2, []),
+    Text = case lists:prefix(Prefix, Text0) of
+               false ->
+                   lists:reverse(Text0, Prefix);
+               true ->
+                   lists:reverse(lists:nthtail(length(Prefix), Text0))
+            end,
+    case Text of
+        [] ->
+            no;
+        [_|_] ->
+            {Text, Cs}
+    end.
+
 link_or_image_text([$\\,C|Cs], Acc) ->
     link_or_image_text(Cs, [C|Acc]);
-link_or_image_text([$]|_Cs], "") ->
-    no;
 link_or_image_text([$]|Cs], Acc) ->
-    {lists:reverse(Acc), Cs};
+    {Acc, Cs};
 link_or_image_text([C|Cs], Acc) ->
     link_or_image_text(Cs, [C|Acc]);
 link_or_image_text([], _Acc) ->
-    no.
+    {[], []}.
 
 link_or_image_data([C|Cs], none, link, "", "") when C == $ ; C == $\t ->
     link_or_image_data(Cs, none, link, "", "");
-- 
2.16.4