[gxml] Implemented CssSelectorParser E:root pseudo selector

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 85f3ea78a900bed127cf71fe52bd43ec37072f73
Author: Daniel Espinosa <esodan gmail com>
Date:   Fri Sep 8 08:40:30 2017 -0700

    Implemented CssSelectorParser E:root pseudo selector

 gxml/CssSelectorParser.vala |   13 ++++++++-
 test/CssSelectorTest.vala   |   59 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 71 insertions(+), 1 deletions(-)
---
diff --git a/gxml/CssSelectorParser.vala b/gxml/CssSelectorParser.vala
index 30b1ea8..8be1b14 100644
--- a/gxml/CssSelectorParser.vala
+++ b/gxml/CssSelectorParser.vala
@@ -218,6 +218,7 @@ public class GXml.CssSelectorParser : GLib.Object {
                while (css.get_next_char (ref position, out u) && (u.isalnum() || u == '-' || u == ':'))
                        sb.append_unichar (u);
                string[] valid_selectors = {
+                       "root",
                        "checked",
                        "disabled",
                        "empty",
@@ -230,7 +231,7 @@ public class GXml.CssSelectorParser : GLib.Object {
                        "last-of-type"
                };
                if (!(sb.str in valid_selectors))
-                       throw new CssSelectorError.INVALID (_("Invalid pseudo class selector"));
+                       throw new CssSelectorError.INVALID (_("Invalid pseudo class selector %s").printf 
(sb.str));
                CssSelectorData data = new CssSelectorData.with_values (CssSelectorType.PSEUDO, sb.str, "");
                list.add (data);
        }
@@ -356,6 +357,16 @@ public class GXml.CssSelectorParser : GLib.Object {
                                if (p == null) return false;
                                if (p.has_suffix (s.value+"-")) return true;
                        }
+                       if (is_element && s.selector_type == CssSelectorType.PSEUDO) {
+                               if (s.data.down () == "root") {
+                                       if (element is GomElement)
+                                               if (element != element.owner_document.document_element) 
return false;
+                                       if (element is GElement)
+                                               if ((element as GNode).get_internal_node () 
+                                                                       != 
(element.owner_document.document_element as GNode).get_internal_node ()) return false;
+                                       if (element.node_name.down () == 
element.owner_document.document_element.node_name.down ()) return true;
+                               }
+                       }
                        if (s.selector_type == CssSelectorType.CLASS) {
                                var p = element.get_attribute ("class");
                                if (p == null) return false;
diff --git a/test/CssSelectorTest.vala b/test/CssSelectorTest.vala
index 347dec9..6d30ae9 100644
--- a/test/CssSelectorTest.vala
+++ b/test/CssSelectorTest.vala
@@ -374,5 +374,64 @@ class CssSelectorTest : GXmlTest {
                                warning ("ERROR: "+e.message);
                        }
                });
+               Test.add_func ("/gxml/css-selector/element/pseudo/root", () => {
+                       try {
+                               var cp = new CssSelectorParser ();
+                               cp.parse ("toplevel:root");
+                               foreach (CssSelectorData sel in cp.selectors) {
+                                       message ("Type: "+sel.selector_type.to_string ()+" : "+sel.data+" : 
"+sel.value);
+                               }
+                               assert (cp.selectors.size == 3);
+                               var s = cp.selectors[0];
+                               assert (s != null);
+                               assert (s.selector_type == CssSelectorType.ELEMENT);
+                               var si = cp.selectors[1];
+                               assert (si != null);
+                               assert (si.selector_type == CssSelectorType.INSIDE);
+                               var sa = cp.selectors[2];
+                               assert (sa != null);
+                               assert (sa.selector_type == CssSelectorType.PSEUDO);
+                               var d = new GomDocument ();
+                               var r = d.create_element ("toplevel");
+                               d.append_child (r);
+                               var c1 = d.create_element ("child");
+                               r.append_child (c1);
+                               var c2 = d.create_element ("child");
+                               c2.set_attribute ("prop", "subval");
+                               r.append_child (c2);
+                               var c3 = d.create_element ("child");
+                               c3.set_attribute ("prop", "techval");
+                               r.append_child (c3);
+                               var c4 = d.create_element ("child");
+                               c4.set_attribute ("prop", "secondaryvalue");
+                               r.append_child (c4);
+                               assert (cp.match (r));
+                               assert (!cp.match (c1));
+                               assert (!cp.match (c2));
+                               assert (!cp.match (c3));
+                               assert (!cp.match (c4));
+                               var d2 = new GDocument () as DomDocument;
+                               var r2 = d2.create_element ("toplevel");
+                               d2.append_child (r2);
+                               var c1g = d2.create_element ("child");
+                               r2.append_child (c1g);
+                               var c2g = d2.create_element ("child");
+                               c2g.set_attribute ("prop", "subval");
+                               r2.append_child (c2g);
+                               var c3g = d2.create_element ("child");
+                               c3g.set_attribute ("prop", "techval");
+                               r2.append_child (c3g);
+                               var c4g = d2.create_element ("child");
+                               c4g.set_attribute ("prop", "secondaryvalue");
+                               r2.append_child (c4g);
+                               assert (cp.match (r));
+                               assert (!cp.match (c1));
+                               assert (!cp.match (c2));
+                               assert (!cp.match (c3));
+                               assert (!cp.match (c4));
+                       } catch (GLib.Error e){
+                               warning ("ERROR: "+e.message);
+                       }
+               });
        }
 }