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[~andy/gtk] / gtk / gtkcssselector.c
index 626b28aa7d56ba155c910f72596b6b173bb00f39..216090faaddccaeba251026712d5066ddac2c63e 100644 (file)
 #include "gtkcssprovider.h"
 #include "gtkstylecontextprivate.h"
 
+/* When checking for changes via the tree we need to know if a rule further
+   down the tree matched, because if so we need to add "our bit" to the
+   Change. For instance in a a match like *.class:active we'll
+   get a tree that first checks :active, if that matches we continue down
+   to the tree, and if we get a match we add CHANGE_CLASS. However, the
+   end of the tree where we have a match is an ANY which doesn't actually
+   modify the change, so we don't know if we have a match or not. We fix
+   this by setting GTK_CSS_CHANGE_GOT_MATCH which lets us guarantee
+   that change != 0 on any match. */
+#define GTK_CSS_CHANGE_GOT_MATCH GTK_CSS_CHANGE_RESERVED_BIT
+
 typedef struct _GtkCssSelectorClass GtkCssSelectorClass;
 
 struct _GtkCssSelectorClass {
@@ -37,7 +48,12 @@ struct _GtkCssSelectorClass {
   void              (* tree_match)  (const GtkCssSelectorTree   *tree,
                                      const GtkCssMatcher        *matcher,
                                     GHashTable                  *res);
-  GtkCssChange      (* get_change)  (const GtkCssSelector       *selector);
+  GtkCssChange      (* get_change)  (const GtkCssSelector       *selector,
+                                    GtkCssChange                previous_change);
+  GtkCssChange      (* tree_get_change)  (const GtkCssSelectorTree *tree,
+                                         const GtkCssMatcher      *matcher);
+  int               (* compare_one) (const GtkCssSelector       *a,
+                                    const GtkCssSelector       *b);
 
   guint         increase_id_specificity :1;
   guint         increase_class_specificity :1;
@@ -54,13 +70,14 @@ struct _GtkCssSelector
                                              - GUINT_TO_POINTER() for PSEUDOCLASS_REGION/STATE */
 };
 
+#define GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET G_MAXINT32
 struct _GtkCssSelectorTree
 {
   GtkCssSelector selector;
-  GtkCssSelectorTree *parent;
-  GtkCssSelectorTree *previous;
-  GtkCssSelectorTree *siblings;
-  gpointer *matches; /* pointers that we return as matches if selector matches */
+  gint32 parent_offset;
+  gint32 previous_offset;
+  gint32 sibling_offset;
+  gint32 matches_offset; /* pointers that we return as matches if selector matches */
 };
 
 static gboolean
@@ -78,16 +95,27 @@ gtk_css_selector_hash (const GtkCssSelector *selector)
   return GPOINTER_TO_UINT (selector->class) ^ GPOINTER_TO_UINT (selector->data);
 }
 
+static gpointer *
+gtk_css_selector_tree_get_matches (const GtkCssSelectorTree *tree)
+{
+  if (tree->matches_offset == GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
+    return NULL;
+
+  return (gpointer *) ((guint8 *)tree + tree->matches_offset);
+}
+
 static void
 gtk_css_selector_tree_found_match (const GtkCssSelectorTree *tree,
                                   GHashTable *res)
 {
   int i;
+  gpointer *matches;
 
-  if (tree->matches)
+  matches = gtk_css_selector_tree_get_matches (tree);
+  if (matches)
     {
-      for (i = 0; tree->matches[i] != NULL; i++)
-       g_hash_table_insert (res, tree->matches[i], tree->matches[i]);
+      for (i = 0; matches[i] != NULL; i++)
+       g_hash_table_insert (res, matches[i], matches[i]);
     }
 }
 
@@ -102,6 +130,16 @@ gtk_css_selector_tree_match (const GtkCssSelectorTree *tree,
   tree->selector.class->tree_match (tree, matcher, res);
 }
 
+static GtkCssChange
+gtk_css_selector_tree_get_change (const GtkCssSelectorTree *tree,
+                                 const GtkCssMatcher      *matcher)
+{
+  if (tree == NULL)
+    return 0;
+
+  return tree->selector.class->tree_get_change (tree, matcher);
+}
+
 static gboolean
 gtk_css_selector_match (const GtkCssSelector *selector,
                         const GtkCssMatcher  *matcher)
@@ -112,15 +150,15 @@ gtk_css_selector_match (const GtkCssSelector *selector,
   return selector->class->match (selector, matcher);
 }
 
-static GtkCssChange
-gtk_css_selector_get_change (const GtkCssSelector *selector)
+static int
+gtk_css_selector_compare_one (const GtkCssSelector *a, const GtkCssSelector *b)
 {
-  if (selector == NULL)
-    return 0;
-
-  return selector->class->get_change (selector);
+  if (a->class != b->class)
+    return strcmp (a->class->name, b->class->name);
+  else
+    return a->class->compare_one (a, b);
 }
-
+  
 static const GtkCssSelector *
 gtk_css_selector_previous (const GtkCssSelector *selector)
 {
@@ -129,6 +167,62 @@ gtk_css_selector_previous (const GtkCssSelector *selector)
   return selector->class ? selector : NULL;
 }
 
+static const GtkCssSelectorTree *
+gtk_css_selector_tree_at_offset (const GtkCssSelectorTree *tree,
+                                gint32 offset)
+{
+  if (offset == GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
+    return NULL;
+
+  return (GtkCssSelectorTree *) ((guint8 *)tree + offset);
+}
+
+static const GtkCssSelectorTree *
+gtk_css_selector_tree_get_parent (const GtkCssSelectorTree *tree)
+{
+  return gtk_css_selector_tree_at_offset (tree, tree->parent_offset);
+}
+
+static const GtkCssSelectorTree *
+gtk_css_selector_tree_get_previous (const GtkCssSelectorTree *tree)
+{
+  return gtk_css_selector_tree_at_offset (tree, tree->previous_offset);
+}
+
+static const GtkCssSelectorTree *
+gtk_css_selector_tree_get_sibling (const GtkCssSelectorTree *tree)
+{
+  return gtk_css_selector_tree_at_offset (tree, tree->sibling_offset);
+}
+
+static void
+gtk_css_selector_tree_match_previous (const GtkCssSelectorTree *tree,
+                                     const GtkCssMatcher *matcher,
+                                     GHashTable *res)
+{
+  const GtkCssSelectorTree *prev;
+
+  for (prev = gtk_css_selector_tree_get_previous (tree);
+       prev != NULL;
+       prev = gtk_css_selector_tree_get_sibling (prev))
+    gtk_css_selector_tree_match (prev, matcher, res);
+}
+
+static GtkCssChange
+gtk_css_selector_tree_get_previous_change (const GtkCssSelectorTree *tree,
+                                          const GtkCssMatcher      *matcher)
+{
+  GtkCssChange previous_change = 0;
+  const GtkCssSelectorTree *prev;
+
+  for (prev = gtk_css_selector_tree_get_previous (tree);
+       prev != NULL;
+       prev = gtk_css_selector_tree_get_sibling (prev))
+    previous_change |= gtk_css_selector_tree_get_change (prev, matcher);
+
+  return previous_change;
+}
+
 /* DESCENDANT */
 
 static void
@@ -161,26 +255,58 @@ gtk_css_selector_descendant_tree_match (const GtkCssSelectorTree *tree,
                                        GHashTable *res)
 {
   GtkCssMatcher ancestor;
-  const GtkCssSelectorTree *prev;
 
   while (_gtk_css_matcher_get_parent (&ancestor, matcher))
     {
       matcher = &ancestor;
 
-      for (prev = tree->previous; prev != NULL; prev = prev->siblings)
-       gtk_css_selector_tree_match (prev, matcher, res);
+      gtk_css_selector_tree_match_previous (tree, matcher, res);
+
+      /* any matchers are dangerous here, as we may loop forever, but
+        we can terminate now as all possible matches have already been added */
+      if (_gtk_css_matcher_matches_any (matcher))
+       break;
+    }
+}
+
+static GtkCssChange
+gtk_css_selector_descendant_tree_get_change (const GtkCssSelectorTree *tree,
+                                            const GtkCssMatcher  *matcher)
+{
+  GtkCssMatcher ancestor;
+  GtkCssChange change, previous_change;
+
+  change = 0;
+  previous_change = 0;
+  while (_gtk_css_matcher_get_parent (&ancestor, matcher))
+    {
+      matcher = &ancestor;
+
+      previous_change |= gtk_css_selector_tree_get_previous_change (tree, matcher);
 
       /* any matchers are dangerous here, as we may loop forever, but
         we can terminate now as all possible matches have already been added */
       if (_gtk_css_matcher_matches_any (matcher))
        break;
     }
+
+  if (previous_change != 0)
+    change |= _gtk_css_change_for_child (previous_change) | GTK_CSS_CHANGE_GOT_MATCH;
+
+  return change;
 }
 
+static int
+gtk_css_selector_descendant_compare_one (const GtkCssSelector *a,
+                                        const GtkCssSelector *b)
+{
+  return 0;
+}
+  
 static GtkCssChange
-gtk_css_selector_descendant_get_change (const GtkCssSelector *selector)
+gtk_css_selector_descendant_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
 {
-  return _gtk_css_change_for_child (gtk_css_selector_get_change (gtk_css_selector_previous (selector)));
+  return _gtk_css_change_for_child (previous_change);
 }
 
 static const GtkCssSelectorClass GTK_CSS_SELECTOR_DESCENDANT = {
@@ -189,6 +315,8 @@ static const GtkCssSelectorClass GTK_CSS_SELECTOR_DESCENDANT = {
   gtk_css_selector_descendant_match,
   gtk_css_selector_descendant_tree_match,
   gtk_css_selector_descendant_get_change,
+  gtk_css_selector_descendant_tree_get_change,
+  gtk_css_selector_descendant_compare_one,
   FALSE, FALSE, FALSE, FALSE, FALSE
 };
 
@@ -219,19 +347,45 @@ gtk_css_selector_child_tree_match (const GtkCssSelectorTree *tree,
                                   GHashTable *res)
 {
   GtkCssMatcher parent;
-  const GtkCssSelectorTree *prev;
 
   if (!_gtk_css_matcher_get_parent (&parent, matcher))
     return;
 
-  for (prev = tree->previous; prev != NULL; prev = prev->siblings)
-    gtk_css_selector_tree_match (prev, &parent, res);
+  gtk_css_selector_tree_match_previous (tree, &parent, res);
+}
+
+
+static GtkCssChange
+gtk_css_selector_child_tree_get_change (const GtkCssSelectorTree *tree,
+                                       const GtkCssMatcher  *matcher)
+{
+  GtkCssMatcher parent;
+  GtkCssChange change, previous_change;
+
+  if (!_gtk_css_matcher_get_parent (&parent, matcher))
+    return 0;
+
+  change = 0;
+
+  previous_change = gtk_css_selector_tree_get_previous_change (tree, &parent);
+
+  if (previous_change != 0)
+    change |= _gtk_css_change_for_child (previous_change) | GTK_CSS_CHANGE_GOT_MATCH;
+
+  return change;
 }
 
 static GtkCssChange
-gtk_css_selector_child_get_change (const GtkCssSelector *selector)
+gtk_css_selector_child_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
 {
-  return _gtk_css_change_for_child (gtk_css_selector_get_change (gtk_css_selector_previous (selector)));
+  return _gtk_css_change_for_child (previous_change);
+}
+
+static int
+gtk_css_selector_child_compare_one (const GtkCssSelector *a,
+                                   const GtkCssSelector *b)
+{
+  return 0;
 }
 
 static const GtkCssSelectorClass GTK_CSS_SELECTOR_CHILD = {
@@ -240,6 +394,8 @@ static const GtkCssSelectorClass GTK_CSS_SELECTOR_CHILD = {
   gtk_css_selector_child_match,
   gtk_css_selector_child_tree_match,
   gtk_css_selector_child_get_change,
+  gtk_css_selector_child_tree_get_change,
+  gtk_css_selector_child_compare_one,
   FALSE, FALSE, FALSE, FALSE, FALSE
 };
 
@@ -275,34 +431,70 @@ gtk_css_selector_sibling_tree_match (const GtkCssSelectorTree *tree,
                                     GHashTable *res)
 {
   GtkCssMatcher previous;
-  const GtkCssSelectorTree *prev;
 
   while (_gtk_css_matcher_get_previous (&previous, matcher))
     {
       matcher = &previous;
 
-      for (prev = tree->previous; prev != NULL; prev = prev->siblings)
-       gtk_css_selector_tree_match (prev, matcher, res);
+      gtk_css_selector_tree_match_previous (tree, matcher, res);
+
+      /* any matchers are dangerous here, as we may loop forever, but
+        we can terminate now as all possible matches have already been added */
+      if (_gtk_css_matcher_matches_any (matcher))
+       break;
+    }
+}
+
+static GtkCssChange
+gtk_css_selector_sibling_tree_get_change (const GtkCssSelectorTree *tree,
+                                         const GtkCssMatcher  *matcher)
+{
+  GtkCssMatcher previous;
+  GtkCssChange change, previous_change;
+
+  change = 0;
+
+  previous_change = 0;
+  while (_gtk_css_matcher_get_previous (&previous, matcher))
+    {
+      matcher = &previous;
+
+      previous_change |= gtk_css_selector_tree_get_previous_change (tree, matcher);
 
       /* any matchers are dangerous here, as we may loop forever, but
         we can terminate now as all possible matches have already been added */
       if (_gtk_css_matcher_matches_any (matcher))
        break;
     }
+
+  if (previous_change != 0)
+    change |= _gtk_css_change_for_sibling (previous_change) |  GTK_CSS_CHANGE_GOT_MATCH;
+
+  return change;
 }
 
 static GtkCssChange
-gtk_css_selector_sibling_get_change (const GtkCssSelector *selector)
+gtk_css_selector_sibling_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
 {
-  return _gtk_css_change_for_sibling (gtk_css_selector_get_change (gtk_css_selector_previous (selector)));
+  return _gtk_css_change_for_sibling (previous_change);
 }
 
+static int
+gtk_css_selector_sibling_compare_one (const GtkCssSelector *a,
+                                     const GtkCssSelector *b)
+{
+  return 0;
+}
+  
+
 static const GtkCssSelectorClass GTK_CSS_SELECTOR_SIBLING = {
   "sibling",
   gtk_css_selector_sibling_print,
   gtk_css_selector_sibling_match,
   gtk_css_selector_sibling_tree_match,
   gtk_css_selector_sibling_get_change,
+  gtk_css_selector_sibling_tree_get_change,
+  gtk_css_selector_sibling_compare_one,
   FALSE, FALSE, FALSE, FALSE, FALSE
 };
 
@@ -333,21 +525,46 @@ gtk_css_selector_adjacent_tree_match (const GtkCssSelectorTree *tree,
                                      GHashTable *res)
 {
   GtkCssMatcher previous;
-  const GtkCssSelectorTree *prev;
 
   if (!_gtk_css_matcher_get_previous (&previous, matcher))
     return;
 
   matcher = &previous;
 
-  for (prev = tree->previous; prev != NULL; prev = prev->siblings)
-    gtk_css_selector_tree_match (prev, matcher, res);
+  gtk_css_selector_tree_match_previous (tree, matcher, res);
+}
+
+static GtkCssChange
+gtk_css_selector_adjacent_tree_get_change (const GtkCssSelectorTree *tree,
+                                          const GtkCssMatcher  *matcher)
+{
+  GtkCssMatcher previous;
+  GtkCssChange change, previous_change;
+
+  if (!_gtk_css_matcher_get_previous (&previous, matcher))
+    return 0;
+
+  change = 0;
+
+  previous_change = gtk_css_selector_tree_get_previous_change (tree, &previous);
+
+  if (previous_change != 0)
+    change |= _gtk_css_change_for_sibling (previous_change) |  GTK_CSS_CHANGE_GOT_MATCH;
+
+  return change;
 }
 
 static GtkCssChange
-gtk_css_selector_adjacent_get_change (const GtkCssSelector *selector)
+gtk_css_selector_adjacent_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
+{
+  return _gtk_css_change_for_sibling (previous_change);
+}
+
+static int
+gtk_css_selector_adjacent_compare_one (const GtkCssSelector *a,
+                                      const GtkCssSelector *b)
 {
-  return _gtk_css_change_for_sibling (gtk_css_selector_get_change (gtk_css_selector_previous (selector)));
+  return 0;
 }
 
 static const GtkCssSelectorClass GTK_CSS_SELECTOR_ADJACENT = {
@@ -356,6 +573,8 @@ static const GtkCssSelectorClass GTK_CSS_SELECTOR_ADJACENT = {
   gtk_css_selector_adjacent_match,
   gtk_css_selector_adjacent_tree_match,
   gtk_css_selector_adjacent_get_change,
+  gtk_css_selector_adjacent_tree_get_change,
+  gtk_css_selector_adjacent_compare_one,
   FALSE, FALSE, FALSE, FALSE, FALSE
 };
 
@@ -390,27 +609,64 @@ gtk_css_selector_any_tree_match (const GtkCssSelectorTree *tree,
                                 const GtkCssMatcher  *matcher,
                                 GHashTable *res)
 {
-  const GtkCssSelectorTree *prev, *prev2;
+  const GtkCssSelectorTree *prev;
 
   gtk_css_selector_tree_found_match (tree, res);
 
-  for (prev = tree->previous; prev != NULL; prev = prev->siblings)
+  for (prev = gtk_css_selector_tree_get_previous (tree);
+       prev != NULL;
+       prev = gtk_css_selector_tree_get_sibling (prev))
     {
       if (prev->selector.class == &GTK_CSS_SELECTOR_DESCENDANT &&
          _gtk_css_matcher_has_regions (matcher))
-       {
-         for (prev2 = prev->previous; prev2 != NULL; prev2 = prev2->siblings)
-           gtk_css_selector_tree_match (prev2, matcher, res);
-       }
+       gtk_css_selector_tree_match_previous (prev, matcher, res);
 
       gtk_css_selector_tree_match (prev, matcher, res);
     }
 }
 
 static GtkCssChange
-gtk_css_selector_any_get_change (const GtkCssSelector *selector)
+gtk_css_selector_any_tree_get_change (const GtkCssSelectorTree *tree,
+                                     const GtkCssMatcher  *matcher)
+{
+  const GtkCssSelectorTree *prev;
+  GtkCssChange change, previous_change;
+
+  change = 0;
+
+  if (tree->matches_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
+    change |= GTK_CSS_CHANGE_GOT_MATCH;
+
+  previous_change = 0;
+  for (prev = gtk_css_selector_tree_get_previous (tree);
+       prev != NULL;
+       prev = gtk_css_selector_tree_get_sibling (prev))
+    {
+      if (prev->selector.class == &GTK_CSS_SELECTOR_DESCENDANT &&
+         _gtk_css_matcher_has_regions (matcher))
+       previous_change |= gtk_css_selector_tree_get_previous_change (prev, matcher);
+
+      previous_change |= gtk_css_selector_tree_get_change (prev, matcher);
+    }
+
+  if (previous_change != 0)
+    change |= previous_change | GTK_CSS_CHANGE_GOT_MATCH;
+
+  return change;
+}
+
+
+static GtkCssChange
+gtk_css_selector_any_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
 {
-  return gtk_css_selector_get_change (gtk_css_selector_previous (selector));
+  return previous_change;
+}
+
+static int
+gtk_css_selector_any_compare_one (const GtkCssSelector *a,
+                                 const GtkCssSelector *b)
+{
+  return 0;
 }
 
 static const GtkCssSelectorClass GTK_CSS_SELECTOR_ANY = {
@@ -419,23 +675,84 @@ static const GtkCssSelectorClass GTK_CSS_SELECTOR_ANY = {
   gtk_css_selector_any_match,
   gtk_css_selector_any_tree_match,
   gtk_css_selector_any_get_change,
+  gtk_css_selector_any_tree_get_change,
+  gtk_css_selector_any_compare_one,
   FALSE, FALSE, FALSE, TRUE, TRUE
 };
 
 /* NAME */
 
+typedef struct {
+  GType type;
+  const char *name;
+} TypeReference;
+
+static GHashTable *type_refs_ht = NULL;
+static guint type_refs_last_serial = 0;
+
+static TypeReference *
+get_type_reference (const char *name)
+{
+  TypeReference *ref;
+
+
+  if (type_refs_ht == NULL)
+    type_refs_ht = g_hash_table_new (g_str_hash, g_str_equal);
+
+  ref = g_hash_table_lookup (type_refs_ht, name);
+
+  if (ref != NULL)
+    return ref;
+
+  ref = g_slice_new (TypeReference);
+  ref->name = g_intern_string (name);
+  ref->type = g_type_from_name (ref->name);
+
+  g_hash_table_insert (type_refs_ht,
+                      (gpointer)ref->name, ref);
+
+  return ref;
+}
+
+static void
+update_type_references (void)
+{
+  GHashTableIter iter;
+  guint serial;
+  gpointer value;
+
+  serial = g_type_get_type_registration_serial ();
+
+  if (serial == type_refs_last_serial)
+    return;
+
+  type_refs_last_serial = serial;
+
+  if (type_refs_ht == NULL)
+    return;
+
+  g_hash_table_iter_init (&iter, type_refs_ht);
+  while (g_hash_table_iter_next (&iter,
+                                NULL, &value))
+    {
+      TypeReference *ref = value;
+      if (ref->type == G_TYPE_INVALID)
+       ref->type = g_type_from_name (ref->name);
+    }
+}
+
 static void
 gtk_css_selector_name_print (const GtkCssSelector *selector,
                              GString              *string)
 {
-  g_string_append (string, selector->data);
+  g_string_append (string, ((TypeReference *)selector->data)->name);
 }
 
 static gboolean
 gtk_css_selector_name_match (const GtkCssSelector *selector,
                              const GtkCssMatcher  *matcher)
 {
-  if (!_gtk_css_matcher_has_name (matcher, selector->data))
+  if (!_gtk_css_matcher_has_type (matcher, ((TypeReference *)selector->data)->type))
     return FALSE;
 
   return gtk_css_selector_match (gtk_css_selector_previous (selector), matcher);
@@ -446,22 +763,49 @@ gtk_css_selector_name_tree_match (const GtkCssSelectorTree *tree,
                                  const GtkCssMatcher  *matcher,
                                  GHashTable *res)
 {
-  const GtkCssSelectorTree *prev;
-
-  if (!_gtk_css_matcher_has_name (matcher, tree->selector.data))
+  if (!_gtk_css_matcher_has_type (matcher, ((TypeReference *)tree->selector.data)->type))
     return;
 
   gtk_css_selector_tree_found_match (tree, res);
 
-  for (prev = tree->previous; prev != NULL; prev = prev->siblings)
-    gtk_css_selector_tree_match (prev, matcher, res);
+  gtk_css_selector_tree_match_previous (tree, matcher, res);
+}
+
+static GtkCssChange
+gtk_css_selector_name_tree_get_change (const GtkCssSelectorTree *tree,
+                                      const GtkCssMatcher  *matcher)
+{
+  GtkCssChange change, previous_change;
+
+  if (!_gtk_css_matcher_has_type (matcher, ((TypeReference *)tree->selector.data)->type))
+    return 0;
+
+  change = 0;
+
+  if (tree->matches_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
+    change |= GTK_CSS_CHANGE_NAME | GTK_CSS_CHANGE_GOT_MATCH;
+
+  previous_change = gtk_css_selector_tree_get_previous_change (tree, matcher);
+
+  if (previous_change)
+    change |= previous_change | GTK_CSS_CHANGE_NAME | GTK_CSS_CHANGE_GOT_MATCH;
+
+  return change;
 }
 
 
 static GtkCssChange
-gtk_css_selector_name_get_change (const GtkCssSelector *selector)
+gtk_css_selector_name_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
 {
-  return gtk_css_selector_get_change (gtk_css_selector_previous (selector)) | GTK_CSS_CHANGE_NAME;
+  return previous_change | GTK_CSS_CHANGE_NAME;
+}
+
+static int
+gtk_css_selector_name_compare_one (const GtkCssSelector *a,
+                                  const GtkCssSelector *b)
+{
+  return strcmp (((TypeReference *)a->data)->name,
+                ((TypeReference *)b->data)->name);
 }
 
 static const GtkCssSelectorClass GTK_CSS_SELECTOR_NAME = {
@@ -470,6 +814,8 @@ static const GtkCssSelectorClass GTK_CSS_SELECTOR_NAME = {
   gtk_css_selector_name_match,
   gtk_css_selector_name_tree_match,
   gtk_css_selector_name_get_change,
+  gtk_css_selector_name_tree_get_change,
+  gtk_css_selector_name_compare_one,
   FALSE, FALSE, TRUE, TRUE, FALSE
 };
 
@@ -504,43 +850,87 @@ gtk_css_selector_region_tree_match (const GtkCssSelectorTree *tree,
                                    const GtkCssMatcher  *matcher,
                                    GHashTable *res)
 {
-  const GtkCssSelectorTree *prev, *prev2;
+  const GtkCssSelectorTree *prev;
 
   if (!_gtk_css_matcher_has_region (matcher, tree->selector.data, 0))
     return;
 
   gtk_css_selector_tree_found_match (tree, res);
 
-  for (prev = tree->previous; prev != NULL; prev = prev->siblings)
+  for (prev = gtk_css_selector_tree_get_previous (tree);
+       prev != NULL;
+       prev = gtk_css_selector_tree_get_sibling (prev))
     {
       if (prev->selector.class == &GTK_CSS_SELECTOR_DESCENDANT)
-       {
-         for (prev2 = prev->previous; prev2 != NULL; prev2 = prev2->siblings)
-           gtk_css_selector_tree_match (prev2, matcher, res);
-       }
+       gtk_css_selector_tree_match_previous (prev, matcher, res);
 
       gtk_css_selector_tree_match (prev, matcher, res);
     }
 }
 
 static GtkCssChange
-gtk_css_selector_region_get_change (const GtkCssSelector *selector)
+gtk_css_selector_region_tree_get_change (const GtkCssSelectorTree *tree,
+                                        const GtkCssMatcher  *matcher)
+{
+  const GtkCssSelectorTree *prev;
+  GtkCssChange change, previous_change;
+
+  if (!_gtk_css_matcher_has_region (matcher, tree->selector.data, 0))
+    return 0;
+
+  change = 0;
+
+  if (tree->matches_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
+    change |= GTK_CSS_CHANGE_REGION | GTK_CSS_CHANGE_GOT_MATCH;
+
+  previous_change = 0;
+  for (prev = gtk_css_selector_tree_get_previous (tree);
+       prev != NULL;
+       prev = gtk_css_selector_tree_get_sibling (prev))
+    {
+      if (prev->selector.class == &GTK_CSS_SELECTOR_DESCENDANT)
+       previous_change |= gtk_css_selector_tree_get_previous_change (prev, matcher);
+
+      previous_change |= gtk_css_selector_tree_get_change (prev, matcher);
+    }
+
+  if (previous_change != 0)
+    {
+      previous_change |= GTK_CSS_CHANGE_REGION;
+      previous_change |= _gtk_css_change_for_child (previous_change);
+      change |= previous_change | GTK_CSS_CHANGE_GOT_MATCH;
+    }
+
+  return change;
+}
+
+static GtkCssChange
+gtk_css_selector_region_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
 {
   GtkCssChange change;
 
-  change = gtk_css_selector_get_change (gtk_css_selector_previous (selector));
+  change = previous_change;
   change |= GTK_CSS_CHANGE_REGION;
   change |= _gtk_css_change_for_child (change);
 
   return change;
 }
 
+static int
+gtk_css_selector_region_compare_one (const GtkCssSelector *a,
+                                    const GtkCssSelector *b)
+{
+  return strcmp (a->data, b->data);
+}
+
 static const GtkCssSelectorClass GTK_CSS_SELECTOR_REGION = {
   "region",
   gtk_css_selector_region_print,
   gtk_css_selector_region_match,
   gtk_css_selector_region_tree_match,
   gtk_css_selector_region_get_change,
+  gtk_css_selector_region_tree_get_change,
+  gtk_css_selector_region_compare_one,
   FALSE, FALSE, TRUE, TRUE, TRUE
 };
 
@@ -569,21 +959,48 @@ gtk_css_selector_class_tree_match (const GtkCssSelectorTree *tree,
                                   const GtkCssMatcher  *matcher,
                                   GHashTable *res)
 {
-  const GtkCssSelectorTree *prev;
-
   if (!_gtk_css_matcher_has_class (matcher, GPOINTER_TO_UINT (tree->selector.data)))
     return;
 
   gtk_css_selector_tree_found_match (tree, res);
 
-  for (prev = tree->previous; prev != NULL; prev = prev->siblings)
-    gtk_css_selector_tree_match (prev, matcher, res);
+  gtk_css_selector_tree_match_previous (tree, matcher, res);
+}
+
+static GtkCssChange
+gtk_css_selector_class_tree_get_change (const GtkCssSelectorTree *tree,
+                                       const GtkCssMatcher  *matcher)
+{
+  GtkCssChange change, previous_change;
+
+  if (!_gtk_css_matcher_has_class (matcher, GPOINTER_TO_UINT (tree->selector.data)))
+    return 0;
+
+  change = 0;
+
+  if (tree->matches_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
+    change |= GTK_CSS_CHANGE_CLASS | GTK_CSS_CHANGE_GOT_MATCH;
+
+  previous_change = gtk_css_selector_tree_get_previous_change (tree, matcher);
+
+  if (previous_change != 0)
+    change |= previous_change | GTK_CSS_CHANGE_CLASS | GTK_CSS_CHANGE_GOT_MATCH;
+
+  return change;
 }
 
 static GtkCssChange
-gtk_css_selector_class_get_change (const GtkCssSelector *selector)
+gtk_css_selector_class_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
 {
-  return gtk_css_selector_get_change (gtk_css_selector_previous (selector)) | GTK_CSS_CHANGE_CLASS;
+  return previous_change | GTK_CSS_CHANGE_CLASS;
+}
+
+static int
+gtk_css_selector_class_compare_one (const GtkCssSelector *a,
+                                   const GtkCssSelector *b)
+{
+  return strcmp (g_quark_to_string (GPOINTER_TO_UINT (a->data)),
+                g_quark_to_string (GPOINTER_TO_UINT (b->data)));
 }
 
 static const GtkCssSelectorClass GTK_CSS_SELECTOR_CLASS = {
@@ -592,6 +1009,8 @@ static const GtkCssSelectorClass GTK_CSS_SELECTOR_CLASS = {
   gtk_css_selector_class_match,
   gtk_css_selector_class_tree_match,
   gtk_css_selector_class_get_change,
+  gtk_css_selector_class_tree_get_change,
+  gtk_css_selector_class_compare_one,
   FALSE, TRUE, FALSE, TRUE, FALSE
 };
 
@@ -620,21 +1039,48 @@ gtk_css_selector_id_tree_match (const GtkCssSelectorTree *tree,
                                const GtkCssMatcher  *matcher,
                                GHashTable *res)
 {
-  const GtkCssSelectorTree *prev;
-
   if (!_gtk_css_matcher_has_id (matcher, tree->selector.data))
     return;
 
   gtk_css_selector_tree_found_match (tree, res);
 
-  for (prev = tree->previous; prev != NULL; prev = prev->siblings)
-    gtk_css_selector_tree_match (prev, matcher, res);
+  gtk_css_selector_tree_match_previous (tree, matcher, res);
+}
+
+static GtkCssChange
+gtk_css_selector_id_tree_get_change (const GtkCssSelectorTree *tree,
+                                    const GtkCssMatcher  *matcher)
+{
+  GtkCssChange change, previous_change;
+
+  if (!_gtk_css_matcher_has_id (matcher, tree->selector.data))
+    return 0;
+
+  change = 0;
+
+  if (tree->matches_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
+    change |= GTK_CSS_CHANGE_ID | GTK_CSS_CHANGE_GOT_MATCH;
+
+  previous_change = gtk_css_selector_tree_get_previous_change (tree, matcher);
+
+  if (previous_change != 0)
+    change |= previous_change | GTK_CSS_CHANGE_ID | GTK_CSS_CHANGE_GOT_MATCH;
+
+  return change;
 }
 
 static GtkCssChange
-gtk_css_selector_id_get_change (const GtkCssSelector *selector)
+gtk_css_selector_id_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
 {
-  return gtk_css_selector_get_change (gtk_css_selector_previous (selector)) | GTK_CSS_CHANGE_ID;
+  return previous_change | GTK_CSS_CHANGE_ID;
+}
+
+
+static int
+gtk_css_selector_id_compare_one (const GtkCssSelector *a,
+                                const GtkCssSelector *b)
+{
+  return strcmp (a->data, b->data);
 }
 
 static const GtkCssSelectorClass GTK_CSS_SELECTOR_ID = {
@@ -643,6 +1089,8 @@ static const GtkCssSelectorClass GTK_CSS_SELECTOR_ID = {
   gtk_css_selector_id_match,
   gtk_css_selector_id_tree_match,
   gtk_css_selector_id_get_change,
+  gtk_css_selector_id_tree_get_change,
+  gtk_css_selector_id_compare_one,
   TRUE, FALSE, FALSE, TRUE, FALSE
 };
 
@@ -659,7 +1107,9 @@ gtk_css_selector_pseudoclass_state_print (const GtkCssSelector *selector,
     "insensitive",
     "inconsistent",
     "focus",
-    "backdrop"
+    "backdrop",
+    "dir(ltr)",
+    "dir(rtl)"
   };
   guint i, state;
 
@@ -696,22 +1146,49 @@ gtk_css_selector_pseudoclass_state_tree_match (const GtkCssSelectorTree *tree,
                                               GHashTable *res)
 {
   GtkStateFlags state = GPOINTER_TO_UINT (tree->selector.data);
-  const GtkCssSelectorTree *prev;
 
   if ((_gtk_css_matcher_get_state (matcher) & state) != state)
     return;
 
   gtk_css_selector_tree_found_match (tree, res);
 
-  for (prev = tree->previous; prev != NULL; prev = prev->siblings)
-    gtk_css_selector_tree_match (prev, matcher, res);
+  gtk_css_selector_tree_match_previous (tree, matcher, res);
 }
 
+static GtkCssChange
+gtk_css_selector_pseudoclass_state_tree_get_change (const GtkCssSelectorTree *tree,
+                                                   const GtkCssMatcher  *matcher)
+{
+  GtkStateFlags state = GPOINTER_TO_UINT (tree->selector.data);
+  GtkCssChange change, previous_change;
+
+  if ((_gtk_css_matcher_get_state (matcher) & state) != state)
+    return 0;
+
+  change = 0;
+
+  if (tree->matches_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
+    change |= GTK_CSS_CHANGE_STATE | GTK_CSS_CHANGE_GOT_MATCH;
+
+  previous_change = gtk_css_selector_tree_get_previous_change (tree, matcher);
+
+  if (previous_change != 0)
+    change |= previous_change | GTK_CSS_CHANGE_STATE | GTK_CSS_CHANGE_GOT_MATCH;
+
+  return change;
+}
 
 static GtkCssChange
-gtk_css_selector_pseudoclass_state_get_change (const GtkCssSelector *selector)
+gtk_css_selector_pseudoclass_state_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
 {
-  return gtk_css_selector_get_change (gtk_css_selector_previous (selector)) | GTK_CSS_CHANGE_STATE;
+  return previous_change | GTK_CSS_CHANGE_STATE;
+}
+
+static int
+gtk_css_selector_pseudoclass_state_compare_one (const GtkCssSelector *a,
+                                               const GtkCssSelector *b)
+{
+  return GPOINTER_TO_UINT (a->data) - GPOINTER_TO_UINT (b->data);
 }
 
 static const GtkCssSelectorClass GTK_CSS_SELECTOR_PSEUDOCLASS_STATE = {
@@ -720,6 +1197,8 @@ static const GtkCssSelectorClass GTK_CSS_SELECTOR_PSEUDOCLASS_STATE = {
   gtk_css_selector_pseudoclass_state_match,
   gtk_css_selector_pseudoclass_state_tree_match,
   gtk_css_selector_pseudoclass_state_get_change,
+  gtk_css_selector_pseudoclass_state_tree_get_change,
+  gtk_css_selector_pseudoclass_state_compare_one,
   FALSE, TRUE, FALSE, TRUE, FALSE
 };
 
@@ -862,11 +1341,8 @@ gtk_css_selector_pseudoclass_position_print (const GtkCssSelector *selector,
 }
 
 static gboolean
-gtk_css_selector_pseudoclass_position_match_for_region (const GtkCssSelector *selector,
-                                                        const GtkCssMatcher  *matcher)
+get_selector_flags_for_position_region_match (const GtkCssSelector *selector, GtkRegionFlags *selector_flags)
 {
-  GtkRegionFlags selector_flags;
-  const GtkCssSelector *previous;
   PositionType type;
   int a, b;
 
@@ -875,30 +1351,44 @@ gtk_css_selector_pseudoclass_position_match_for_region (const GtkCssSelector *se
     {
     case POSITION_FORWARD:
       if (a == 0 && b == 1)
-        selector_flags = GTK_REGION_FIRST;
+        *selector_flags = GTK_REGION_FIRST;
       else if (a == 2 && b == 0)
-        selector_flags = GTK_REGION_EVEN;
+        *selector_flags = GTK_REGION_EVEN;
       else if (a == 2 && b == 1)
-        selector_flags = GTK_REGION_ODD;
+        *selector_flags = GTK_REGION_ODD;
       else
         return FALSE;
       break;
     case POSITION_BACKWARD:
       if (a == 0 && b == 1)
-        selector_flags = GTK_REGION_LAST;
+        *selector_flags = GTK_REGION_LAST;
       else
         return FALSE;
       break;
     case POSITION_ONLY:
-      selector_flags = GTK_REGION_ONLY;
+      *selector_flags = GTK_REGION_ONLY;
       break;
     case POSITION_SORTED:
-      selector_flags = GTK_REGION_SORTED;
+      *selector_flags = GTK_REGION_SORTED;
       break;
     default:
       g_assert_not_reached ();
       break;
     }
+
+  return TRUE;
+}
+
+static gboolean
+gtk_css_selector_pseudoclass_position_match_for_region (const GtkCssSelector *selector,
+                                                        const GtkCssMatcher  *matcher)
+{
+  GtkRegionFlags selector_flags;
+  const GtkCssSelector *previous;
+
+  if (!get_selector_flags_for_position_region_match (selector, &selector_flags))
+      return FALSE;
+
   selector = gtk_css_selector_previous (selector);
 
   if (!_gtk_css_matcher_has_region (matcher, selector->data, selector_flags))
@@ -913,17 +1403,12 @@ gtk_css_selector_pseudoclass_position_match_for_region (const GtkCssSelector *se
 }
 
 static gboolean
-gtk_css_selector_pseudoclass_position_match (const GtkCssSelector *selector,
-                                             const GtkCssMatcher  *matcher)
+get_position_match (const GtkCssSelector *selector,
+                   const GtkCssMatcher  *matcher)
 {
-  const GtkCssSelector *previous;
   PositionType type;
   int a, b;
 
-  previous = gtk_css_selector_previous (selector);
-  if (previous && previous->class == &GTK_CSS_SELECTOR_REGION)
-    return gtk_css_selector_pseudoclass_position_match_for_region (selector, matcher);
-
   decode_position (selector, &type, &a, &b);
   switch (type)
     {
@@ -947,6 +1432,22 @@ gtk_css_selector_pseudoclass_position_match (const GtkCssSelector *selector,
       return FALSE;
     }
 
+  return TRUE;
+}
+
+static gboolean
+gtk_css_selector_pseudoclass_position_match (const GtkCssSelector *selector,
+                                             const GtkCssMatcher  *matcher)
+{
+  const GtkCssSelector *previous;
+
+  previous = gtk_css_selector_previous (selector);
+  if (previous && previous->class == &GTK_CSS_SELECTOR_REGION)
+    return gtk_css_selector_pseudoclass_position_match_for_region (selector, matcher);
+
+  if (!get_position_match (selector, matcher))
+    return FALSE;
+
   return gtk_css_selector_match (previous, matcher);
 }
 
@@ -958,48 +1459,21 @@ gtk_css_selector_pseudoclass_position_tree_match_for_region (const GtkCssSelecto
 {
   const GtkCssSelectorTree *prev2;
   GtkRegionFlags selector_flags;
-  PositionType type;
-  int a, b;
 
-  decode_position (&tree->selector, &type, &a, &b);
-  switch (type)
-    {
-    case POSITION_FORWARD:
-      if (a == 0 && b == 1)
-        selector_flags = GTK_REGION_FIRST;
-      else if (a == 2 && b == 0)
-        selector_flags = GTK_REGION_EVEN;
-      else if (a == 2 && b == 1)
-        selector_flags = GTK_REGION_ODD;
-      else
-        return;
-      break;
-    case POSITION_BACKWARD:
-      if (a == 0 && b == 1)
-        selector_flags = GTK_REGION_LAST;
-      else
-        return;
-      break;
-    case POSITION_ONLY:
-      selector_flags = GTK_REGION_ONLY;
-      break;
-    case POSITION_SORTED:
-      selector_flags = GTK_REGION_SORTED;
-      break;
-    default:
-      g_assert_not_reached ();
-      break;
-    }
+  if (!get_selector_flags_for_position_region_match (&tree->selector, &selector_flags))
+      return;
 
   if (!_gtk_css_matcher_has_region (matcher, prev->selector.data, selector_flags))
     return;
 
   gtk_css_selector_tree_found_match (prev, res);
 
-  for (prev2 = prev->previous; prev2 != NULL; prev2 = prev2->siblings)
+  for (prev2 = gtk_css_selector_tree_get_previous (prev);
+       prev2 != NULL;
+       prev2 = gtk_css_selector_tree_get_sibling (prev2))
     {
       if (prev2->selector.class == &GTK_CSS_SELECTOR_DESCENDANT)
-       gtk_css_selector_tree_match (prev2->previous, matcher, res);
+       gtk_css_selector_tree_match (gtk_css_selector_tree_get_previous (prev2), matcher, res);
       gtk_css_selector_tree_match (prev2, matcher, res);
     }
 }
@@ -1010,41 +1484,21 @@ gtk_css_selector_pseudoclass_position_tree_match (const GtkCssSelectorTree *tree
                                                  GHashTable *res)
 {
   const GtkCssSelectorTree *prev;
-  PositionType type;
-  int a, b;
 
-  for (prev = tree->previous; prev != NULL; prev = prev->siblings)
+  for (prev = gtk_css_selector_tree_get_previous (tree);
+       prev != NULL;
+       prev = gtk_css_selector_tree_get_sibling (prev))
     {
       if (prev->selector.class == &GTK_CSS_SELECTOR_REGION)
        gtk_css_selector_pseudoclass_position_tree_match_for_region (tree, prev, matcher, res);
     }
 
-  decode_position (&tree->selector, &type, &a, &b);
-  switch (type)
-    {
-    case POSITION_FORWARD:
-      if (!_gtk_css_matcher_has_position (matcher, TRUE, a, b))
-       return;
-      break;
-    case POSITION_BACKWARD:
-      if (!_gtk_css_matcher_has_position (matcher, FALSE, a, b))
-       return;
-      break;
-    case POSITION_ONLY:
-      if (!_gtk_css_matcher_has_position (matcher, TRUE, 0, 1) ||
-         !_gtk_css_matcher_has_position (matcher, FALSE, 0, 1))
-       return;
-      break;
-    case POSITION_SORTED:
-      return;
-    default:
-      g_assert_not_reached ();
-      return;
-    }
+  if (!get_position_match (&tree->selector, matcher))
+    return;
 
   gtk_css_selector_tree_found_match (tree, res);
 
-  for (prev = tree->previous; prev != NULL; prev = prev->siblings)
+  for (prev = gtk_css_selector_tree_get_previous (tree); prev != NULL; prev = gtk_css_selector_tree_get_sibling (prev))
     {
       if (prev->selector.class != &GTK_CSS_SELECTOR_REGION)
        gtk_css_selector_tree_match (prev, matcher, res);
@@ -1052,9 +1506,87 @@ gtk_css_selector_pseudoclass_position_tree_match (const GtkCssSelectorTree *tree
 }
 
 static GtkCssChange
-gtk_css_selector_pseudoclass_position_get_change (const GtkCssSelector *selector)
+gtk_css_selector_pseudoclass_position_tree_get_change_for_region (const GtkCssSelectorTree *tree,
+                                                                 const GtkCssSelectorTree *prev,
+                                                                 const GtkCssMatcher  *matcher)
+{
+  const GtkCssSelectorTree *prev2;
+  GtkRegionFlags selector_flags;
+  GtkCssChange change, previous_change;
+
+  if (!get_selector_flags_for_position_region_match (&tree->selector, &selector_flags))
+      return 0;
+
+  if (!_gtk_css_matcher_has_region (matcher, prev->selector.data, selector_flags))
+    return 0;
+
+  change = 0;
+  if (tree->matches_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
+    change |= GTK_CSS_CHANGE_POSITION | GTK_CSS_CHANGE_GOT_MATCH;
+
+  previous_change = 0;
+  for (prev2 = gtk_css_selector_tree_get_previous (prev);
+       prev2 != NULL;
+       prev2 = gtk_css_selector_tree_get_sibling (prev2))
+    {
+      if (prev2->selector.class == &GTK_CSS_SELECTOR_DESCENDANT)
+       previous_change |= gtk_css_selector_tree_get_change (gtk_css_selector_tree_get_previous (prev2), matcher);
+      previous_change |= gtk_css_selector_tree_get_change (prev2, matcher);
+    }
+
+  if (previous_change != 0)
+    change |= previous_change | GTK_CSS_CHANGE_POSITION | GTK_CSS_CHANGE_GOT_MATCH;
+
+  return change;
+}
+
+static GtkCssChange
+gtk_css_selector_pseudoclass_position_tree_get_change (const GtkCssSelectorTree *tree,
+                                                      const GtkCssMatcher  *matcher)
+{
+  const GtkCssSelectorTree *prev;
+  GtkCssChange change, previous_change;
+
+  change = 0;
+
+  for (prev = gtk_css_selector_tree_get_previous (tree);
+       prev != NULL;
+       prev = gtk_css_selector_tree_get_sibling (prev))
+    {
+      if (prev->selector.class == &GTK_CSS_SELECTOR_REGION)
+       change |= gtk_css_selector_pseudoclass_position_tree_get_change_for_region (tree, prev, matcher);
+    }
+
+  if (!get_position_match (&tree->selector, matcher))
+    return change;
+
+  if (tree->matches_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
+    change |= GTK_CSS_CHANGE_POSITION | GTK_CSS_CHANGE_GOT_MATCH;
+
+  previous_change = 0;
+  for (prev = gtk_css_selector_tree_get_previous (tree); prev != NULL; prev = gtk_css_selector_tree_get_sibling (prev))
+    {
+      if (prev->selector.class != &GTK_CSS_SELECTOR_REGION)
+       previous_change |= gtk_css_selector_tree_get_change (prev, matcher);
+    }
+
+  if (previous_change != 0)
+    change |= previous_change | GTK_CSS_CHANGE_POSITION | GTK_CSS_CHANGE_GOT_MATCH;
+
+  return change;
+}
+
+static GtkCssChange
+gtk_css_selector_pseudoclass_position_get_change (const GtkCssSelector *selector, GtkCssChange previous_change)
 {
-  return gtk_css_selector_get_change (gtk_css_selector_previous (selector)) | GTK_CSS_CHANGE_POSITION;
+  return previous_change | GTK_CSS_CHANGE_POSITION;
+}
+
+static int
+gtk_css_selector_pseudoclass_position_compare_one (const GtkCssSelector *a,
+                                                  const GtkCssSelector *b)
+{
+  return GPOINTER_TO_UINT (a->data) - GPOINTER_TO_UINT (b->data);
 }
 
 static const GtkCssSelectorClass GTK_CSS_SELECTOR_PSEUDOCLASS_POSITION = {
@@ -1063,6 +1595,8 @@ static const GtkCssSelectorClass GTK_CSS_SELECTOR_PSEUDOCLASS_POSITION = {
   gtk_css_selector_pseudoclass_position_match,
   gtk_css_selector_pseudoclass_position_tree_match,
   gtk_css_selector_pseudoclass_position_get_change,
+  gtk_css_selector_pseudoclass_position_tree_get_change,
+  gtk_css_selector_pseudoclass_position_compare_one,
   FALSE, TRUE, FALSE, TRUE, TRUE
 };
 
@@ -1291,7 +1825,9 @@ parse_selector_pseudo_class (GtkCssParser   *parser,
     { "inconsistent", GTK_STATE_FLAG_INCONSISTENT, },
     { "focused",      GTK_STATE_FLAG_FOCUSED, },
     { "focus",        GTK_STATE_FLAG_FOCUSED, },
-    { "backdrop",     GTK_STATE_FLAG_BACKDROP, }
+    { "backdrop",     GTK_STATE_FLAG_BACKDROP, },
+    { "dir(ltr)",     GTK_STATE_FLAG_DIR_LTR, },
+    { "dir(rtl)",     GTK_STATE_FLAG_DIR_RTL, }
   };
   guint i;
 
@@ -1333,11 +1869,14 @@ try_parse_name (GtkCssParser   *parser,
   name = _gtk_css_parser_try_ident (parser, FALSE);
   if (name)
     {
-      selector = gtk_css_selector_new (_gtk_style_context_check_region_name (name)
-                                       ? &GTK_CSS_SELECTOR_REGION
-                                       : &GTK_CSS_SELECTOR_NAME,
-                                       selector,
-                                       g_intern_string (name));
+      if (_gtk_style_context_check_region_name (name))
+       selector = gtk_css_selector_new (&GTK_CSS_SELECTOR_REGION,
+                                        selector,
+                                        g_intern_string (name));
+      else
+       selector = gtk_css_selector_new (&GTK_CSS_SELECTOR_NAME,
+                                        selector,
+                                        get_type_reference (name));
       g_free (name);
     }
   else if (_gtk_css_parser_try (parser, "*", FALSE))
@@ -1438,12 +1977,21 @@ _gtk_css_selector_to_string (const GtkCssSelector *selector)
   return g_string_free (string, FALSE);
 }
 
+
 GtkCssChange
-_gtk_css_selector_get_change (const GtkCssSelector *selector)
+_gtk_css_selector_tree_match_get_change (const GtkCssSelectorTree *tree)
 {
-  g_return_val_if_fail (selector != NULL, 0);
+  GtkCssChange change = 0;
+
+  update_type_references ();
 
-  return gtk_css_selector_get_change (selector);
+  while (tree)
+    {
+      change = tree->selector.class->get_change (&tree->selector, change);
+      tree = gtk_css_selector_tree_get_parent (tree);
+    }
+
+  return change;
 }
 
 /**
@@ -1468,6 +2016,8 @@ _gtk_css_selector_matches (const GtkCssSelector *selector,
   g_return_val_if_fail (selector != NULL, FALSE);
   g_return_val_if_fail (matcher != NULL, FALSE);
 
+  update_type_references ();
+
   return gtk_css_selector_match (selector, matcher);
 }
 
@@ -1598,7 +2148,7 @@ direct_ptr_compare (const void *_a, const void *_b)
 }
 
 GPtrArray *
-_gtk_css_selector_tree_match_all (GtkCssSelectorTree *tree,
+_gtk_css_selector_tree_match_all (const GtkCssSelectorTree *tree,
                                  const GtkCssMatcher *matcher)
 {
   GHashTable *res;
@@ -1606,9 +2156,12 @@ _gtk_css_selector_tree_match_all (GtkCssSelectorTree *tree,
   GHashTableIter iter;
   gpointer key;
 
+  update_type_references ();
+
   res = g_hash_table_new (g_direct_hash, g_direct_equal);
 
-  for (; tree != NULL; tree = tree->siblings)
+  for (; tree != NULL;
+       tree = gtk_css_selector_tree_get_sibling (tree))
     gtk_css_selector_tree_match (tree, matcher, res);
 
   array = g_ptr_array_sized_new (g_hash_table_size (res));
@@ -1624,6 +2177,22 @@ _gtk_css_selector_tree_match_all (GtkCssSelectorTree *tree,
   return array;
 }
 
+GtkCssChange
+_gtk_css_selector_tree_get_change_all (const GtkCssSelectorTree *tree,
+                                      const GtkCssMatcher *matcher)
+{
+  GtkCssChange change;
+
+  change = 0;
+
+  for (; tree != NULL;
+       tree = gtk_css_selector_tree_get_sibling (tree))
+    change |= gtk_css_selector_tree_get_change (tree, matcher);
+
+  /* Never return reserved bit set */
+  return change & ~GTK_CSS_CHANGE_RESERVED_BIT;
+}
+
 #ifdef PRINT_TREE
 static void
 _gtk_css_selector_tree_print (GtkCssSelectorTree *tree, GString *str, char *prefix)
@@ -1655,7 +2224,7 @@ _gtk_css_selector_tree_print (GtkCssSelectorTree *tree, GString *str, char *pref
       tree->selector.class->print (&tree->selector, str);
       len = str->len - len;
 
-      if (tree->previous)
+      if (gtk_css_selector_tree_get_previous (tree))
        {
          GString *prefix2 = g_string_new (prefix);
 
@@ -1666,7 +2235,7 @@ _gtk_css_selector_tree_print (GtkCssSelectorTree *tree, GString *str, char *pref
          for (i = 0; i < len; i++)
            g_string_append_c (prefix2, ' ');
 
-         _gtk_css_selector_tree_print (tree->previous, str, prefix2->str);
+         _gtk_css_selector_tree_print (gtk_css_selector_tree_get_previous (tree), str, prefix2->str);
          g_string_free (prefix2, TRUE);
        }
       else
@@ -1675,15 +2244,27 @@ _gtk_css_selector_tree_print (GtkCssSelectorTree *tree, GString *str, char *pref
 }
 #endif
 
+void
+_gtk_css_selector_tree_match_print (const GtkCssSelectorTree *tree,
+                                   GString *str)
+{
+  const GtkCssSelectorTree *parent;
+
+  g_return_if_fail (tree != NULL);
+
+  tree->selector.class->print (&tree->selector, str);
+
+  parent = gtk_css_selector_tree_get_parent (tree);
+  if (parent != NULL)
+    _gtk_css_selector_tree_match_print (parent, str);
+}
+
 void
 _gtk_css_selector_tree_free (GtkCssSelectorTree *tree)
 {
   if (tree == NULL)
     return;
 
-  _gtk_css_selector_tree_free (tree->siblings);
-  _gtk_css_selector_tree_free (tree->previous);
-
   g_free (tree);
 }
 
@@ -1691,26 +2272,46 @@ _gtk_css_selector_tree_free (GtkCssSelectorTree *tree)
 typedef struct {
   gpointer match;
   GtkCssSelector *current_selector;
+  GtkCssSelectorTree **selector_match;
 } GtkCssSelectorRuleSetInfo;
 
+static GtkCssSelectorTree *
+get_tree (GByteArray *array, gint32 offset)
+{
+  return (GtkCssSelectorTree *) (array->data + offset);
+}
 
 static GtkCssSelectorTree *
-subdivide_infos (GList *infos, GtkCssSelectorTree *parent)
+alloc_tree (GByteArray *array, gint32 *offset)
 {
-  GHashTable *ht = gtk_css_selectors_count_initial_init ();
+  GtkCssSelectorTree tree = { { NULL} };
+
+  *offset = array->len;
+  g_byte_array_append (array, (guint8 *)&tree, sizeof (GtkCssSelectorTree));
+  return get_tree (array, *offset);
+}
+
+static gint32
+subdivide_infos (GByteArray *array, GList *infos, gint32 parent_offset)
+{
+  GHashTable *ht;
   GList *l;
   GList *matched;
   GList *remaining;
+  gint32 tree_offset;
   GtkCssSelectorTree *tree;
   GtkCssSelectorRuleSetInfo *info;
-  GtkCssSelector *max_selector;
+  GtkCssSelector max_selector;
   GHashTableIter iter;
   guint max_count;
   gpointer key, value;
   GPtrArray *exact_matches;
+  gint32 res;
 
   if (infos == NULL)
-    return NULL;
+    return GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET;
+
+  ht = gtk_css_selectors_count_initial_init ();
 
   for (l = infos; l != NULL; l = l->next)
     {
@@ -1722,39 +2323,43 @@ subdivide_infos (GList *infos, GtkCssSelectorTree *parent)
      as that makes it possible to skip the largest amount of checks later */
 
   max_count = 0;
-  max_selector = NULL;
 
   g_hash_table_iter_init (&iter, ht);
   while (g_hash_table_iter_next (&iter, &key, &value))
     {
-      if (GPOINTER_TO_UINT (value) > max_count)
+      GtkCssSelector *selector = key;
+      if (GPOINTER_TO_UINT (value) > max_count ||
+         (GPOINTER_TO_UINT (value) == max_count &&
+         gtk_css_selector_compare_one (selector, &max_selector) < 0))
        {
          max_count = GPOINTER_TO_UINT (value);
-         max_selector = key;
+         max_selector = *selector;
        }
     }
 
   matched = NULL;
   remaining = NULL;
 
-  tree = g_new0 (GtkCssSelectorTree, 1);
-  tree->parent = parent;
-  tree->selector = *max_selector;
+  tree = alloc_tree (array, &tree_offset);
+  tree->parent_offset = parent_offset;
+  tree->selector = max_selector;
 
   exact_matches = NULL;
   for (l = infos; l != NULL; l = l->next)
     {
       info = l->data;
 
-      if (gtk_css_selectors_has_initial_selector (info->current_selector, &tree->selector))
+      if (gtk_css_selectors_has_initial_selector (info->current_selector, &max_selector))
        {
-         info->current_selector = gtk_css_selectors_skip_initial_selector (info->current_selector, &tree->selector);
+         info->current_selector = gtk_css_selectors_skip_initial_selector (info->current_selector, &max_selector);
          if (info->current_selector == NULL)
            {
              /* Matches current node */
              if (exact_matches == NULL)
                exact_matches = g_ptr_array_new ();
              g_ptr_array_add (exact_matches, info->match);
+             if (info->selector_match != NULL)
+               *info->selector_match = GUINT_TO_POINTER (tree_offset);
            }
          else
            matched = g_list_prepend (matched, info);
@@ -1768,16 +2373,26 @@ subdivide_infos (GList *infos, GtkCssSelectorTree *parent)
   if (exact_matches)
     {
       g_ptr_array_add (exact_matches, NULL); /* Null terminate */
-      tree->matches = g_ptr_array_free (exact_matches, FALSE);
+      res = array->len;
+      g_byte_array_append (array, (guint8 *)exact_matches->pdata,
+                          exact_matches->len * sizeof (gpointer));
+      g_ptr_array_free (exact_matches, TRUE);
     }
+  else
+    res = GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET;
+  get_tree (array, tree_offset)->matches_offset = res;
 
-  if (matched)
-    tree->previous = subdivide_infos (matched, tree);
+  res = subdivide_infos (array, matched, tree_offset);
+  get_tree (array, tree_offset)->previous_offset = res;
 
-  if (remaining)
-    tree->siblings = subdivide_infos (remaining, parent);
+  res = subdivide_infos (array, remaining, parent_offset);
+  get_tree (array, tree_offset)->sibling_offset = res;
 
-  return tree;
+  g_list_free (matched);
+  g_list_free (remaining);
+  g_hash_table_unref (ht);
+
+  return tree_offset;
 }
 
 struct _GtkCssSelectorTreeBuilder {
@@ -1800,21 +2415,71 @@ _gtk_css_selector_tree_builder_free  (GtkCssSelectorTreeBuilder *builder)
 void
 _gtk_css_selector_tree_builder_add (GtkCssSelectorTreeBuilder *builder,
                                    GtkCssSelector            *selectors,
+                                   GtkCssSelectorTree       **selector_match,
                                    gpointer                   match)
 {
   GtkCssSelectorRuleSetInfo *info = g_new0 (GtkCssSelectorRuleSetInfo, 1);
 
   info->match = match;
   info->current_selector = selectors;
+  info->selector_match = selector_match;
   builder->infos = g_list_prepend (builder->infos, info);
 }
 
+/* Convert all offsets to node-relative */
+static void
+fixup_offsets (GtkCssSelectorTree *tree, guint8 *data)
+{
+  while (tree != NULL)
+    {
+      if (tree->parent_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
+       tree->parent_offset -= ((guint8 *)tree - data);
+
+      if (tree->previous_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
+       tree->previous_offset -= ((guint8 *)tree - data);
+
+      if (tree->sibling_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
+       tree->sibling_offset -= ((guint8 *)tree - data);
+
+      if (tree->matches_offset != GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET)
+       tree->matches_offset -= ((guint8 *)tree - data);
+
+      fixup_offsets ((GtkCssSelectorTree *)gtk_css_selector_tree_get_previous (tree), data);
+
+      tree = (GtkCssSelectorTree *)gtk_css_selector_tree_get_sibling (tree);
+    }
+}
+
 GtkCssSelectorTree *
 _gtk_css_selector_tree_builder_build (GtkCssSelectorTreeBuilder *builder)
 {
   GtkCssSelectorTree *tree;
+  GByteArray *array;
+  guint8 *data;
+  guint len;
+  GList *l;
+  GtkCssSelectorRuleSetInfo *info;
+
+  array = g_byte_array_new ();
+  subdivide_infos (array, builder->infos, GTK_CSS_SELECTOR_TREE_EMPTY_OFFSET);
 
-  tree = subdivide_infos (builder->infos, NULL);
+  len = array->len;
+  data = g_byte_array_free (array, FALSE);
+
+  /* shrink to final size */
+  data = g_realloc (data, len);
+
+  tree = (GtkCssSelectorTree *)data;
+
+  fixup_offsets (tree, data);
+
+  /* Convert offsets to final pointers */
+  for (l = builder->infos; l != NULL; l = l->next)
+    {
+      info = l->data;
+      if (info->selector_match)
+       *info->selector_match = (GtkCssSelectorTree *)(data + GPOINTER_TO_UINT (*info->selector_match));
+    }
 
 #ifdef PRINT_TREE
   {