[template-glib] expr-scanner.l: use @ to escape reserved words

[Christian Hergert <chergert src gnome org>]

commit b75b466cad0e81e921c679ee4f2e937e23b54437
Author: Christian Hergert <chergert redhat com>
Date:   Wed May 4 11:15:13 2022 -0700

    expr-scanner.l: use @ to escape reserved words
    
    Without this, you can't call a function called "require" on a GObject as
    the require keyword would have higher priority. To use the reserved keyword
    you can now instead use the following, similar to C♯.
    
    obj.@require(args)

 src/tmpl-expr-scanner.l | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/src/tmpl-expr-scanner.l b/src/tmpl-expr-scanner.l
index 404d3e6..6e1368b 100644
--- a/src/tmpl-expr-scanner.l
+++ b/src/tmpl-expr-scanner.l
@@ -78,6 +78,12 @@ TmplExprParser *parser = yyextra;
  /* string literals */
 L?\"(\\.|[^\\"])*\" { yylval->s = yytext; return STRING_LITERAL; }
 
+ /* @ to escape reserved keywords */
+@[a-zA-Z_][a-zA-Z0-9_]* {
+  yylval->s = g_strdup (yytext+1);
+  return NAME;
+}
+
  /* names */
 [a-zA-Z_][a-zA-Z0-9_]* {
   yylval->s = g_strdup (yytext);