[gobject-introspection/gnome-42] giscanner: Support C99 designated initializers

[Emmanuele Bassi <ebassi src gnome org>]

commit 0358eaa6245d9003f0f5b44cd4ed6d0282853c51
Author: Jan Tojnar <jtojnar gmail com>
Date:   Wed Aug 17 16:14:46 2022 +0200

    giscanner: Support C99 designated initializers
    
    https://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html
    
    Based on 
https://github.com/katef/kgt/blob/c9d8ad246855c6b65e42371be7898f4073c28d18/examples/c99-grammar.iso-ebnf#L247-L252

 giscanner/scannerparser.y | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)
---
diff --git a/giscanner/scannerparser.y b/giscanner/scannerparser.y
index e0709cde4..52fc19963 100644
--- a/giscanner/scannerparser.y
+++ b/giscanner/scannerparser.y
@@ -1406,8 +1406,23 @@ initializer
        ;
 
 initializer_list
-       : initializer
-       | initializer_list ',' initializer
+       : initializer_list_item
+       | initializer_list ',' initializer_list_item
+       ;
+
+initializer_list_item
+       : designator_list '=' initializer
+       | initializer
+       ;
+
+designator_list
+       : designator
+       | designator_list designator
+       ;
+
+designator
+       : '[' constant_expression ']'
+       | '.' identifier
        ;
 
 /* A.2.3 Statements. */