[gtksourceview/gtksourceview-4-8] Merge branch 'unicode-literals' into 'master'

[Christian Hergert <chergert src gnome org>]

commit 7d7721221d941c7070f05ab6eb8df55ed123d36a
Author: Christian Hergert <christian hergert me>
Date:   Wed Apr 27 18:08:04 2022 +0000

    Merge branch 'unicode-literals' into 'master'
    
    c.lang: highlight C11 Unicode literals
    
    See merge request GNOME/gtksourceview!256
    
    (cherry picked from commit e5166ad4625cf1f959537754768d7a40f38de4a3)
    
    94592d7b c.lang: highlight C11 Unicode literals
    67e44204 c.lang: highlight C99 Unicode escapes

 data/language-specs/c.lang | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)
---
diff --git a/data/language-specs/c.lang b/data/language-specs/c.lang
index ff6df3ae..dc5359c3 100644
--- a/data/language-specs/c.lang
+++ b/data/language-specs/c.lang
@@ -62,7 +62,9 @@
       \\(                   # leading backslash
       [\\\"\'nrbtfav\?] |   # escaped character
       [0-7]{1,3} |          # one, two, or three octal digits
-      x[0-9A-Fa-f]+         # 'x' followed by hex digits
+      x[0-9A-Fa-f]+ |       # 'x' followed by hex digits
+      u[0-9A-Fa-f]{4} |     # 'u' followed by 4 hex digits
+      U[0-9A-Fa-f]{8}       # 'U' followed by 8 hex digits
       )
     </define-regex>
 
@@ -125,7 +127,7 @@
     </context>
 
     <context id="string" style-ref="string" end-at-line-end="true" class="string" 
class-disabled="no-spell-check">
-      <start>L?"</start>
+      <start>(L|u8|u|U)?"</start>
       <end>"</end>
       <include>
         <context ref="printf"/>
@@ -137,7 +139,7 @@
     </context>
 
     <context id="char" style-ref="char" class="string">
-      <match>L?'(\%{escaped-character}|.)'</match>
+      <match>(L|u8|u|U)?'(\%{escaped-character}|.)'</match>
     </context>
 
     <!-- http://www.lysator.liu.se/c/ANSI-C-grammar-l.html -->