[recipes] Be more strict when generating IDs

[Matthias Clasen <matthiasc src gnome org>]

commit 15056925f633ec97d8886bcbf35e640b39893ab2
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Feb 25 10:04:18 2017 -0500

    Be more strict when generating IDs
    
    The CSS spec does not allow non-alphanumeric ASCII in identifiers,
    so replace them with _.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=779176

 src/gr-utils.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)
---
diff --git a/src/gr-utils.c b/src/gr-utils.c
index 0b6e0f5..bc95230 100644
--- a/src/gr-utils.c
+++ b/src/gr-utils.c
@@ -376,11 +376,12 @@ generate_id (const char *first_string, ...)
         while (s) {
                 for (q = s; *q; q = g_utf8_find_next_char (q, NULL)) {
                         gunichar ch = g_utf8_get_char (q);
-                        if (ch > 128 || ch == '.' || ch == ',' || ch == ' ' ||
-                            ch == ']' || ch == '[' || g_ascii_iscntrl ((char)ch))
-                                g_string_append_c (str, '_');
+                        if (ch > 128 ||
+                            g_ascii_isalnum (ch) || g_ascii_isdigit (ch) ||
+                                 (char)ch == '-' || (char)ch == '_')
+                                g_string_append_unichar (str, ch);
                         else
-                                g_string_append_c (str, (char)ch);
+                                g_string_append_c (str, '_');
                 }
 
                 s = va_arg (ap, const char *);