[gtk+/wip/css-optimize: 2/6] css: Add some methods for getting selector state

[Alexander Larsson <alexl src gnome org>]

commit c55a492ad323a416678c77b70eea7ef7f2bdaedc
Author: Alexander Larsson <alexl redhat com>
Date:   Fri Nov 23 15:49:10 2012 +0100

    css: Add some methods for getting selector state
    
    This adds the following private methods:
    _gtk_css_selector_get_primary_state_flags
    _gtk_css_selector_get_primary_classes
    _gtk_css_selector_has_primary_class
    
    They get state and classes for the primary selector (i.e. the rightmost
    simple selector). This will be used for some css optimizations.

 gtk/gtkcssselector.c        |   69 ++++++++++++++++++++++++++++++++++++-------
 gtk/gtkcssselectorprivate.h |    5 +++
 2 files changed, 63 insertions(+), 11 deletions(-)
---
diff --git a/gtk/gtkcssselector.c b/gtk/gtkcssselector.c
index 999d3b5..46d879d 100644
--- a/gtk/gtkcssselector.c
+++ b/gtk/gtkcssselector.c
@@ -38,6 +38,7 @@ struct _GtkCssSelectorClass {
   guint         increase_id_specificity :1;
   guint         increase_class_specificity :1;
   guint         increase_element_specificity :1;
+  guint         is_simple :1;
 };
 
 struct _GtkCssSelector
@@ -112,7 +113,7 @@ static const GtkCssSelectorClass GTK_CSS_SELECTOR_DESCENDANT = {
   gtk_css_selector_descendant_print,
   gtk_css_selector_descendant_match,
   gtk_css_selector_descendant_get_change,
-  FALSE, FALSE, FALSE
+  FALSE, FALSE, FALSE, FALSE
 };
 
 /* CHILD */
@@ -147,7 +148,7 @@ static const GtkCssSelectorClass GTK_CSS_SELECTOR_CHILD = {
   gtk_css_selector_child_print,
   gtk_css_selector_child_match,
   gtk_css_selector_child_get_change,
-  FALSE, FALSE, FALSE
+  FALSE, FALSE, FALSE, FALSE
 };
 
 /* SIBLING */
@@ -187,7 +188,7 @@ static const GtkCssSelectorClass GTK_CSS_SELECTOR_SIBLING = {
   gtk_css_selector_sibling_print,
   gtk_css_selector_sibling_match,
   gtk_css_selector_sibling_get_change,
-  FALSE, FALSE, FALSE
+  FALSE, FALSE, FALSE, FALSE
 };
 
 /* ADJACENT */
@@ -222,7 +223,7 @@ static const GtkCssSelectorClass GTK_CSS_SELECTOR_ADJACENT = {
   gtk_css_selector_adjacent_print,
   gtk_css_selector_adjacent_match,
   gtk_css_selector_adjacent_get_change,
-  FALSE, FALSE, FALSE
+  FALSE, FALSE, FALSE, FALSE
 };
 
 /* ANY */
@@ -262,7 +263,7 @@ static const GtkCssSelectorClass GTK_CSS_SELECTOR_ANY = {
   gtk_css_selector_any_print,
   gtk_css_selector_any_match,
   gtk_css_selector_any_get_change,
-  FALSE, FALSE, FALSE
+  FALSE, FALSE, FALSE, TRUE
 };
 
 /* NAME */
@@ -295,7 +296,7 @@ static const GtkCssSelectorClass GTK_CSS_SELECTOR_NAME = {
   gtk_css_selector_name_print,
   gtk_css_selector_name_match,
   gtk_css_selector_name_get_change,
-  FALSE, FALSE, TRUE
+  FALSE, FALSE, TRUE, TRUE
 };
 
 /* REGION */
@@ -341,7 +342,7 @@ static const GtkCssSelectorClass GTK_CSS_SELECTOR_REGION = {
   gtk_css_selector_region_print,
   gtk_css_selector_region_match,
   gtk_css_selector_region_get_change,
-  FALSE, FALSE, TRUE
+  FALSE, FALSE, TRUE, TRUE
 };
 
 /* CLASS */
@@ -375,7 +376,7 @@ static const GtkCssSelectorClass GTK_CSS_SELECTOR_CLASS = {
   gtk_css_selector_class_print,
   gtk_css_selector_class_match,
   gtk_css_selector_class_get_change,
-  FALSE, TRUE, FALSE
+  FALSE, TRUE, FALSE, TRUE
 };
 
 /* ID */
@@ -409,7 +410,7 @@ static const GtkCssSelectorClass GTK_CSS_SELECTOR_ID = {
   gtk_css_selector_id_print,
   gtk_css_selector_id_match,
   gtk_css_selector_id_get_change,
-  TRUE, FALSE, FALSE
+  TRUE, FALSE, FALSE, TRUE
 };
 
 /* PSEUDOCLASS FOR STATE */
@@ -464,7 +465,7 @@ static const GtkCssSelectorClass GTK_CSS_SELECTOR_PSEUDOCLASS_STATE = {
   gtk_css_selector_pseudoclass_state_print,
   gtk_css_selector_pseudoclass_state_match,
   gtk_css_selector_pseudoclass_state_get_change,
-  FALSE, TRUE, FALSE
+  FALSE, TRUE, FALSE, TRUE
 };
 
 /* PSEUDOCLASS FOR POSITION */
@@ -705,7 +706,7 @@ static const GtkCssSelectorClass GTK_CSS_SELECTOR_PSEUDOCLASS_POSITION = {
   gtk_css_selector_pseudoclass_position_print,
   gtk_css_selector_pseudoclass_position_match,
   gtk_css_selector_pseudoclass_position_get_change,
-  FALSE, TRUE, FALSE
+  FALSE, TRUE, FALSE, TRUE
 };
 
 /* API */
@@ -1176,3 +1177,49 @@ _gtk_css_selector_get_state_flags (const GtkCssSelector *selector)
   return state;
 }
 
+GtkStateFlags
+_gtk_css_selector_get_primary_state_flags (const GtkCssSelector *selector)
+{
+  GtkStateFlags state = 0;
+
+  g_return_val_if_fail (selector != NULL, 0);
+
+  for (; selector && selector->class->is_simple; selector = gtk_css_selector_previous (selector))
+    {
+      if (selector->class == &GTK_CSS_SELECTOR_PSEUDOCLASS_STATE)
+	state |= GPOINTER_TO_UINT (selector->data);
+    }
+
+  return state;
+}
+
+GQuark *
+_gtk_css_selector_get_primary_classes (const GtkCssSelector *selector)
+{
+  GArray *array = g_array_new (TRUE, FALSE, sizeof (GQuark));
+
+  g_return_val_if_fail (selector != NULL, 0);
+
+  for (; selector && selector->class->is_simple; selector = gtk_css_selector_previous (selector))
+    {
+      if (selector->class == &GTK_CSS_SELECTOR_CLASS)
+	g_array_append_val (array, selector->data);
+    }
+
+  return (GQuark *)g_array_free (array, FALSE);
+}
+
+gboolean
+_gtk_css_selector_has_primary_class (const GtkCssSelector *selector, GQuark class)
+{
+  g_return_val_if_fail (selector != NULL, 0);
+
+  for (; selector && selector->class->is_simple; selector = gtk_css_selector_previous (selector))
+    {
+      if (selector->class == &GTK_CSS_SELECTOR_CLASS)
+	if (GPOINTER_TO_UINT (selector->data) == class)
+	  return TRUE;
+    }
+
+  return FALSE;
+}
diff --git a/gtk/gtkcssselectorprivate.h b/gtk/gtkcssselectorprivate.h
index 6430054..ab0e8f1 100644
--- a/gtk/gtkcssselectorprivate.h
+++ b/gtk/gtkcssselectorprivate.h
@@ -40,6 +40,11 @@ gboolean          _gtk_css_selector_matches         (const GtkCssSelector   *sel
 int               _gtk_css_selector_compare         (const GtkCssSelector   *a,
                                                      const GtkCssSelector   *b);
 
+GtkStateFlags     _gtk_css_selector_get_primary_state_flags (const GtkCssSelector *selector);
+GQuark *          _gtk_css_selector_get_primary_classes     (const GtkCssSelector *selector);
+gboolean          _gtk_css_selector_has_primary_class       (const GtkCssSelector *selector,
+							     GQuark                class);
+
 G_END_DECLS
 
 #endif /* __GTK_CSS_SELECTOR_PRIVATE_H__ */