[gxml] Implemented CssSelectorParser E:empty pseudo selector

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 7afac57f7bf2fd664411ca0398efc6c0d42ee213
Author: Daniel Espinosa <esodan gmail com>
Date:   Fri Sep 8 09:04:23 2017 -0700

    Implemented CssSelectorParser E:empty pseudo selector

 gxml/CssSelectorParser.vala |    3 ++
 test/CssSelectorTest.vala   |   62 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 65 insertions(+), 0 deletions(-)
---
diff --git a/gxml/CssSelectorParser.vala b/gxml/CssSelectorParser.vala
index bf4df62..fbcffea 100644
--- a/gxml/CssSelectorParser.vala
+++ b/gxml/CssSelectorParser.vala
@@ -378,6 +378,9 @@ public class GXml.CssSelectorParser : GLib.Object {
                                        if (!(element.owner_document is DomHtmlDocument)) return false;
                                        // FIXME: check for tags UI allowed to have this state you can use 
E[disable="true"] instead
                                }
+                               if (s.data.down () == "empty") {
+                                       if (!element.has_child_nodes ()) return true;
+                               }
                        }
                        if (s.selector_type == CssSelectorType.CLASS) {
                                var p = element.get_attribute ("class");
diff --git a/test/CssSelectorTest.vala b/test/CssSelectorTest.vala
index fbec172..0303331 100644
--- a/test/CssSelectorTest.vala
+++ b/test/CssSelectorTest.vala
@@ -465,5 +465,67 @@ class CssSelectorTest : GXmlTest {
                                warning ("ERROR: "+e.message);
                        }
                });
+               Test.add_func ("/gxml/css-selector/pseudo/empty", () => {
+                       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);
+                               var c5 = d.create_element ("common");
+                               c4.append_child (c5);
+                               assert (!cp.match (r));
+                               assert (cp.match (c1));
+                               assert (cp.match (c2));
+                               assert (cp.match (c3));
+                               assert (!cp.match (c4));
+                               assert (cp.match (c5));
+                               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);
+                       }
+               });
        }
 }