File 4015-Attempt-to-fix-triple-or-more-quoted-strin... of Package erlang

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File 4015-Attempt-to-fix-triple-or-more-quoted-strings-in-the-.patch of Package erlang

From da19467db9e02ddfa4398bfabe6550b30223d82c Mon Sep 17 00:00:00 2001
From: Raimo Niskanen <raimo@erlang.org>
Date: Thu, 6 Jul 2023 15:21:59 +0200
Subject: [PATCH 5/8] Attempt to fix triple-or-more quoted strings in the Emacs
 mode

---
 lib/tools/emacs/erlang.el | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/lib/tools/emacs/erlang.el b/lib/tools/emacs/erlang.el
index a21f1df25a..ed6cf2520f 100644
--- a/lib/tools/emacs/erlang.el
+++ b/lib/tools/emacs/erlang.el
@@ -1620,7 +1620,26 @@ Other commands:
              ("\$?:^\\|[^$]\$'\$?:[^'\n]\\|\\\\'\$*\$\\$\$'" 1 "w")
              ;; And the dollar sign in $\" or $\' escapes two
              ;; characters, not just one.
-             ("\$\\$\$\\\\[\"']" 1 "'"))))))
+             ("\$\\$\$\\\\[\"']" 1 "'")
+             ;; To highlight triple-or-more quoted strings decently:
+             ;; mark the second to last character in a sequence
+             ;; containing an even number of " characters
+             ;; as an expression prefix character.
+             ;; This makes an opening even number of (4 or above)
+             ;; " characters one or more empty strings
+             ;; followed by one prefixed single opening ",
+             ;; so effectively just a single ".
+             ;; A closing even number of " becomes a single closing "
+             ;; followed by zero or more empty strings,
+             ;; and then one string containing just a prefix ".
+             ;; An odd number of opening or closing " works without
+             ;; any tricks since they become empty strings and
+             ;; an opening or closing single " last or first.
+             ;; " chars within a triple-or-more quoted string really
+             ;; does not work, but a single "-quoted string on one line
+             ;; only looses the string highlighting.
+             ("\$?:\"\"\$+\$\"?\$\"" 1 "'")
+             )))))
 
 
 
-- 
2.35.3

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