Merge branch 'wip/alice/root' into 'main'

cssselector: Support :root

See merge request GNOME/gtk!7170

docs/reference/gtk/css-overview.md

@@ -74,6 +74,7 @@ in a selector, widget names must be prefixed with a # character.
 | E:not(selector) | [CSS Selector Level 3](https://www.w3.org/TR/css3-selectors/#negation) | |
 | E:dir(ltr), E:dir(rtl) | [CSS Selector Level 4](https://drafts.csswg.org/selectors/#the-dir-pseudo) | |
 | E:drop(active) | [CSS Selector Level 4](https://drafts.csswg.org/selectors/#drag-pseudos) | |
+| E:root | [CSS Selector Level 3](https://www.w3.org/TR/selectors-3/#root-pseudo) | |
 | E F | [CSS Selector Level 3](https://www.w3.org/TR/css3-selectors/#descendent-combinators) | |
 | E > F | [CSS Selector Level 3](https://www.w3.org/TR/css3-selectors/#child-combinators) | |
 | E ~ F | [CSS Selector Level 3](https://www.w3.org/TR/css3-selectors/#general-sibling-combinators) | |

gtk/gtkcssselector.c

@@ -892,6 +892,48 @@ DEFINE_SIMPLE_SELECTOR (pseudoclass_position, PSEUDOCLASS_POSITION, print_pseudo
                         match_pseudoclass_position, hash_pseudoclass_position, comp_pseudoclass_position,
                         FALSE, TRUE, FALSE, TRUE)
 #undef GTK_CSS_CHANGE_PSEUDOCLASS_POSITION
+
+/* PSEUDOCLASS FOR ROOT */
+
+static void
+print_pseudoclass_root (const GtkCssSelector *selector,
+                        GString              *string)
+{
+  g_string_append (string, ":root");
+}
+
+static gboolean
+match_pseudoclass_root (const GtkCssSelector *selector,
+                        GtkCssNode           *node)
+{
+  return gtk_css_node_get_parent (node) == NULL;
+}
+
+static guint
+hash_pseudoclass_root (const GtkCssSelector *selector)
+{
+  return GPOINTER_TO_UINT (selector->class);
+}
+
+static int
+comp_pseudoclass_root (const GtkCssSelector *a,
+                       const GtkCssSelector *b)
+{
+  return 0;
+}
+
+static GtkCssChange
+change_pseudoclass_root (const GtkCssSelector *selector)
+{
+  return 0;
+}
+
+#define GTK_CSS_CHANGE_PSEUDOCLASS_ROOT change_pseudoclass_root(selector)
+DEFINE_SIMPLE_SELECTOR (pseudoclass_root, PSEUDOCLASS_ROOT, print_pseudoclass_root,
+                        match_pseudoclass_root, hash_pseudoclass_root, comp_pseudoclass_root,
+                        FALSE, TRUE, FALSE, TRUE)
+#undef GTK_CSS_CHANGE_PSEUDOCLASS_ROOT
+
 /* API */
 
 static guint
@@ -1267,6 +1309,7 @@ gtk_css_selector_parse_selector_pseudo_class (GtkCssParser   *parser,
         PositionType   position_type;
         int            position_a;
         int            position_b;
+        gboolean       is_root;
       } pseudo_classes[] = {
         { "first-child",    0,                           POSITION_FORWARD,  0, 1 },
         { "last-child",     0,                           POSITION_BACKWARD, 0, 1 },
@@ -1283,6 +1326,7 @@ gtk_css_selector_parse_selector_pseudo_class (GtkCssParser   *parser,
         { "checked",        GTK_STATE_FLAG_CHECKED, },
         { "focus-visible",  GTK_STATE_FLAG_FOCUS_VISIBLE, },
         { "focus-within",   GTK_STATE_FLAG_FOCUS_WITHIN, },
+        { "root",           0,                           0,                 0, 0, TRUE },
       };
       guint i;
 
@@ -1297,6 +1341,12 @@ gtk_css_selector_parse_selector_pseudo_class (GtkCssParser   *parser,
                                                    selector);
                   selector->state.state = pseudo_classes[i].state_flag;
                 }
+              else if (pseudo_classes[i].is_root)
+                {
+                  selector = gtk_css_selector_new (negate ? &GTK_CSS_SELECTOR_NOT_PSEUDOCLASS_ROOT
+                                                          : &GTK_CSS_SELECTOR_PSEUDOCLASS_ROOT,
+                                                   selector);
+                }
               else
                 {
                   selector = gtk_css_selector_new (negate ? &GTK_CSS_SELECTOR_NOT_PSEUDOCLASS_POSITION

po/POTFILES.skip

@@ -141,6 +141,7 @@ testsuite/css/style/font.ui
 testsuite/css/style/inherit.ui
 testsuite/css/style/label.ui
 testsuite/css/style/nth-child.ui
+testsuite/css/style/root.ui
 testsuite/gtk/filechooser.c
 testsuite/gtk/focus-chain/widget-factory2.ui
 testsuite/gtk/focus-chain/widget-factory3.ui

testsuite/css/parser/pseudo-classes-known.css

@@ -49,3 +49,7 @@
 :drop(active) {
   color: red;
 }
+
+:root {
+  color: red;
+}

testsuite/css/parser/pseudo-classes-known.ref.css

@@ -49,3 +49,7 @@
 :drop(active) {
   color: rgb(255,0,0);
 }
+
+:root {
+  color: rgb(255,0,0);
+}