emacs-30 21efdd5ef31: Fix c++-ts-mode font-lock for latest c++ grammar (bug#73191)

[Yuan Fu]

branch: emacs-30
commit 21efdd5ef31febc8fd59bf483a39bba512d50f45
Author: Yuan Fu <casouri@gmail.com>
Commit: Yuan Fu <casouri@gmail.com>

    Fix c++-ts-mode font-lock for latest c++ grammar (bug#73191)
    
    * lisp/progmodes/c-ts-mode.el:
    (c-ts-mode--keywords): Add "thread_local" keyword.
    (c-ts-mode--test-virtual-named-p): New function.
    (c-ts-mode--font-lock-settings): Use named/anonymous "virtual" depending
    on the grammar.
---
 lisp/progmodes/c-ts-mode.el | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/lisp/progmodes/c-ts-mode.el b/lisp/progmodes/c-ts-mode.el
index f5cd36c68c7..a3379ad7aab 100644
--- a/lisp/progmodes/c-ts-mode.el
+++ b/lisp/progmodes/c-ts-mode.el
@@ -574,7 +574,7 @@ MODE is either `c' or `cpp'."
                   "or_eq" "override" "private" "protected"
                   "public" "requires" "template" "throw"
                   "try" "typename" "using"
-                  "xor" "xor_eq"))
+                  "xor" "xor_eq" "thread_local"))
       (append '("auto") c-keywords))))
 
 (defvar c-ts-mode--type-keywords
@@ -592,6 +592,11 @@ MODE is either `c' or `cpp'."
                       "LIVE_BUFFER" "FRAME"))
   "A regexp matching all the variants of the FOR_EACH_* macro.")
 
+(defun c-ts-mode--test-virtual-named-p ()
+  "Return t if the virtual keyword is a namded node, nil otherwise."
+  (ignore-errors
+    (progn (treesit-query-compile 'cpp "(virtual)" t) t)))
+
 (defun c-ts-mode--font-lock-settings (mode)
   "Tree-sitter font-lock settings.
 MODE is either `c' or `cpp'."
@@ -636,8 +641,13 @@ MODE is either `c' or `cpp'."
    `([,@(c-ts-mode--keywords mode)] @font-lock-keyword-face
      ,@(when (eq mode 'cpp)
          '((auto) @font-lock-keyword-face
-           (this) @font-lock-keyword-face
-           (virtual) @font-lock-keyword-face)))
+           (this) @font-lock-keyword-face))
+     ,@(when (and (eq mode 'cpp)
+                  (c-ts-mode--test-virtual-named-p))
+         '((virtual) @font-lock-keyword-face))
+     ,@(when (and (eq mode 'cpp)
+                  (not (c-ts-mode--test-virtual-named-p)))
+         '("virtual" @font-lock-keyword-face)))
 
    :language mode
    :feature 'operator