[gtk/wip/matthiasc/css-values: 2/8] css: Implement the superset matcher smarter

[Matthias Clasen <matthiasc src gnome org>]

commit 1764d28c446f2ac2a22f6fa808237bdac8ca7dd0
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jan 12 12:31:11 2020 -0500

    css: Implement the superset matcher smarter
    
    Instead of wrapping the individual vfuncs, and having
    a branch in the inner loop, rewrite the matcher class.

 gtk/gtkcssmatcher.c        | 50 +++++++++++++++++++++-------------------------
 gtk/gtkcssmatcherprivate.h |  1 +
 gtk/gtkcssprovider.c       |  3 ++-
 3 files changed, 26 insertions(+), 28 deletions(-)
---
diff --git a/gtk/gtkcssmatcher.c b/gtk/gtkcssmatcher.c
index 899a7f74f6..0fee1ea6c3 100644
--- a/gtk/gtkcssmatcher.c
+++ b/gtk/gtkcssmatcher.c
@@ -22,6 +22,7 @@
 #include "gtkcssnodedeclarationprivate.h"
 #include "gtkcssnodeprivate.h"
 #include "gtkwidgetpath.h"
+#include "gtkprivate.h"
 
 /* GTK_CSS_MATCHER_WIDGET_PATH */
 
@@ -459,12 +460,7 @@ gtk_css_matcher_superset_get_previous (GtkCssMatcher       *matcher,
 static GtkStateFlags
 gtk_css_matcher_superset_get_state (const GtkCssMatcher *matcher)
 {
-  /* XXX: This gets tricky when we implement :not() */
-
-  if (matcher->superset.relevant & GTK_CSS_CHANGE_STATE)
-    return _gtk_css_matcher_get_state (matcher->superset.subset);
-  else
-    return GTK_STATE_FLAG_ACTIVE | GTK_STATE_FLAG_PRELIGHT | GTK_STATE_FLAG_SELECTED
+  return GTK_STATE_FLAG_ACTIVE | GTK_STATE_FLAG_PRELIGHT | GTK_STATE_FLAG_SELECTED
       | GTK_STATE_FLAG_INSENSITIVE | GTK_STATE_FLAG_INCONSISTENT
       | GTK_STATE_FLAG_FOCUSED | GTK_STATE_FLAG_BACKDROP | GTK_STATE_FLAG_LINK
       | GTK_STATE_FLAG_VISITED;
@@ -474,30 +470,21 @@ static gboolean
 gtk_css_matcher_superset_has_name (const GtkCssMatcher     *matcher,
                                    /*interned*/ const char *name)
 {
-  if (matcher->superset.relevant & GTK_CSS_CHANGE_NAME)
-    return _gtk_css_matcher_has_name (matcher->superset.subset, name);
-  else
-    return TRUE;
+  return TRUE;
 }
 
 static gboolean
 gtk_css_matcher_superset_has_class (const GtkCssMatcher *matcher,
                                     GQuark               class_name)
 {
-  if (matcher->superset.relevant & GTK_CSS_CHANGE_CLASS)
-    return _gtk_css_matcher_has_class (matcher->superset.subset, class_name);
-  else
-    return TRUE;
+  return TRUE;
 }
 
 static gboolean
 gtk_css_matcher_superset_has_id (const GtkCssMatcher *matcher,
                                  const char          *id)
 {
-  if (matcher->superset.relevant & GTK_CSS_CHANGE_NAME)
-    return _gtk_css_matcher_has_id (matcher->superset.subset, id);
-  else
-    return TRUE;
+  return TRUE;
 }
 
 static gboolean
@@ -506,13 +493,10 @@ gtk_css_matcher_superset_has_position (const GtkCssMatcher *matcher,
                                        int                  a,
                                        int                  b)
 {
-  if (matcher->superset.relevant & GTK_CSS_CHANGE_POSITION)
-    return _gtk_css_matcher_has_position (matcher->superset.subset, forward, a, b);
-  else
-    return TRUE;
+  return TRUE;
 }
 
-static const GtkCssMatcherClass GTK_CSS_MATCHER_SUPERSET = {
+static const GtkCssMatcherClass GTK_CSS_MATCHER_SUPERSET2 = {
   gtk_css_matcher_superset_get_parent,
   gtk_css_matcher_superset_get_previous,
   gtk_css_matcher_superset_get_state,
@@ -526,13 +510,25 @@ static const GtkCssMatcherClass GTK_CSS_MATCHER_SUPERSET = {
 void
 _gtk_css_matcher_superset_init (GtkCssMatcher       *matcher,
                                 const GtkCssMatcher *subset,
+                                GtkCssMatcherClass  *klass,
                                 GtkCssChange         relevant)
 {
   g_return_if_fail (subset != NULL);
   g_return_if_fail ((relevant & ~(GTK_CSS_CHANGE_CLASS | GTK_CSS_CHANGE_NAME | GTK_CSS_CHANGE_POSITION | 
GTK_CSS_CHANGE_STATE)) == 0);
 
-  matcher->superset.klass = &GTK_CSS_MATCHER_SUPERSET;
-  matcher->superset.subset = subset;
-  matcher->superset.relevant = relevant;
-}
+  *klass = GTK_CSS_MATCHER_SUPERSET2;
 
+  if (relevant & GTK_CSS_CHANGE_CLASS)
+    klass->has_class = subset->klass->has_class;
+  if (relevant & GTK_CSS_CHANGE_NAME)
+    klass->has_name = subset->klass->has_name;
+  if (relevant & GTK_CSS_CHANGE_NAME)
+    klass->has_id = subset->klass->has_id;
+  if (relevant & GTK_CSS_CHANGE_POSITION)
+    klass->has_position = subset->klass->has_position;
+  if (relevant & GTK_CSS_CHANGE_STATE)
+    klass->get_state = subset->klass->get_state;
+
+  *matcher = *subset;
+  matcher->klass = klass;
+}
diff --git a/gtk/gtkcssmatcherprivate.h b/gtk/gtkcssmatcherprivate.h
index a78f777abb..6f5e9d195c 100644
--- a/gtk/gtkcssmatcherprivate.h
+++ b/gtk/gtkcssmatcherprivate.h
@@ -88,6 +88,7 @@ void              _gtk_css_matcher_node_init      (GtkCssMatcher          *match
 void              _gtk_css_matcher_any_init       (GtkCssMatcher          *matcher);
 void              _gtk_css_matcher_superset_init  (GtkCssMatcher          *matcher,
                                                    const GtkCssMatcher    *subset,
+                                                   GtkCssMatcherClass     *klass,
                                                    GtkCssChange            relevant);
 
 
diff --git a/gtk/gtkcssprovider.c b/gtk/gtkcssprovider.c
index 5c4c6e9e2e..51cc416928 100644
--- a/gtk/gtkcssprovider.c
+++ b/gtk/gtkcssprovider.c
@@ -565,8 +565,9 @@ gtk_css_style_provider_lookup (GtkStyleProvider    *provider,
   if (change)
     {
       GtkCssMatcher change_matcher;
+      GtkCssMatcherClass matcher_class;
 
-      _gtk_css_matcher_superset_init (&change_matcher, matcher, GTK_CSS_CHANGE_NAME | GTK_CSS_CHANGE_CLASS);
+      _gtk_css_matcher_superset_init (&change_matcher, matcher, &matcher_class, GTK_CSS_CHANGE_CLASS | 
GTK_CSS_CHANGE_NAME);
 
       *change = _gtk_css_selector_tree_get_change_all (priv->tree, &change_matcher);
       verify_tree_get_change_results (css_provider, &change_matcher, *change);