[gtk+] css: Make _gtk_css_selector_matches() take a path length

[Benjamin Otte <otte src gnome org>]

commit d6f00427738906151a0f721217d49ce3b003503e
Author: Benjamin Otte <otte redhat com>
Date:   Mon May 16 20:20:55 2011 +0200

    css: Make _gtk_css_selector_matches() take a path length
    
    This will be necessary when handling inherit.

 gtk/gtkcssprovider.c        |    4 ++--
 gtk/gtkcssselector.c        |   20 +++++++++++++++++---
 gtk/gtkcssselectorprivate.h |    3 ++-
 3 files changed, 21 insertions(+), 6 deletions(-)
---
diff --git a/gtk/gtkcssprovider.c b/gtk/gtkcssprovider.c
index 2cf49ad..fd2696a 100644
--- a/gtk/gtkcssprovider.c
+++ b/gtk/gtkcssprovider.c
@@ -1123,7 +1123,7 @@ gtk_css_provider_get_style (GtkStyleProvider *provider,
 
       info = g_ptr_array_index (priv->selectors_info, i);
 
-      if (!_gtk_css_selector_matches (info->selector, path))
+      if (!_gtk_css_selector_matches (info->selector, path, gtk_widget_path_length (path)))
         continue;
 
       g_hash_table_iter_init (&iter, info->style);
@@ -1175,7 +1175,7 @@ gtk_css_provider_get_style_property (GtkStyleProvider *provider,
 
       info = g_ptr_array_index (priv->selectors_info, i);
 
-      if (!_gtk_css_selector_matches (info->selector, path))
+      if (!_gtk_css_selector_matches (info->selector, path, gtk_widget_path_length (path)))
         continue;
 
       selector_state = _gtk_css_selector_get_state_flags (info->selector);
diff --git a/gtk/gtkcssselector.c b/gtk/gtkcssselector.c
index 3850a9e..35db9ca 100644
--- a/gtk/gtkcssselector.c
+++ b/gtk/gtkcssselector.c
@@ -353,18 +353,32 @@ gtk_css_selector_matches_previous (const GtkCssSelector      *selector,
   return FALSE;
 }
 
+/**
+ * _gtk_css_selector_matches:
+ * @selector: the selector
+ * @path: the path to check
+ * @length: How many elements of the path are to be used
+ *
+ * Checks if the @selector matches the given @path. If @length is
+ * smaller than the number of elements in @path, it is assumed that
+ * only the first @length element of @path are valid and the rest
+ * does not exist. This is useful for doing parent matches for the
+ * 'inherit' keyword.
+ *
+ * Returns: %TRUE if the selector matches @path
+ **/
 gboolean
 _gtk_css_selector_matches (const GtkCssSelector      *selector,
-                           /* const */ GtkWidgetPath *path)
+                           /* const */ GtkWidgetPath *path,
+                           guint                      length)
 {
   GSList *list;
-  guint length;
   gboolean match;
 
   g_return_val_if_fail (selector != NULL, FALSE);
   g_return_val_if_fail (path != NULL, FALSE);
+  g_return_val_if_fail (length <= gtk_widget_path_length (path), FALSE);
 
-  length = gtk_widget_path_length (path);
   if (length == 0)
     return FALSE;
 
diff --git a/gtk/gtkcssselectorprivate.h b/gtk/gtkcssselectorprivate.h
index 70c5e60..5a15882 100644
--- a/gtk/gtkcssselectorprivate.h
+++ b/gtk/gtkcssselectorprivate.h
@@ -48,7 +48,8 @@ void              _gtk_css_selector_print           (const GtkCssSelector   *sel
 GtkStateFlags     _gtk_css_selector_get_state_flags (GtkCssSelector         *selector);
 
 gboolean          _gtk_css_selector_matches         (const GtkCssSelector   *selector,
-                                                     /* const */ GtkWidgetPath *path);
+                                                     /* const */ GtkWidgetPath *path,
+                                                     guint                   length);
 int               _gtk_css_selector_compare         (const GtkCssSelector   *a,
                                                      const GtkCssSelector   *b);