[gxml] Added GXml.HtmlDocument

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit bb0282cc6b0ad4c145a50839d65030b24569b2ef
Author: Daniel Espinosa <esodan gmail com>
Date:   Tue Jan 26 14:06:07 2016 -0600

    Added GXml.HtmlDocument
    
    * New HtmlDocument based on libxml2
    * New GXml.Node.get_elements_by_property_value() to search nodes with
      a given attribute name and conteined value

 gxml/GHtml.vala          |   86 ++++++++++++++++++++++++++++++++++++++++++++++
 gxml/Node.vala           |    4 +-
 gxml/libxml-Element.vala |    2 +-
 3 files changed, 89 insertions(+), 3 deletions(-)
---
diff --git a/gxml/GHtml.vala b/gxml/GHtml.vala
new file mode 100644
index 0000000..111e975
--- /dev/null
+++ b/gxml/GHtml.vala
@@ -0,0 +1,86 @@
+/* -*- Mode: vala; indent-tabs-mode: t; c-basic-offset: 2; tab-width: 2 -*- */
+/* xNode.vala
+ *
+ * Copyright (C) 2015,2016  Yannick Inizan <inizan yannick gmail com>
+ * Copyright (C) 2015,2016  Daniel Espinosa <esodan gmail com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *      Yannick Inizan <inizan yannick gmail com>
+ *      Daniel Espinosa <esodan gmail com>
+ */
+
+using Gee;
+
+namespace GXml {
+       public class HtmlDocument : GXml.xDocument {
+               public static int default_options {
+                       get {
+                               return Html.ParserOption.NONET | Html.ParserOption.NOWARNING | 
Html.ParserOption.NOERROR | Html.ParserOption.NOBLANKS;
+                       }
+               }
+               
+               public HtmlDocument.from_path (string path, int options = 0) throws GLib.Error {
+                       this.from_file (File.new_for_path (path), options);
+               }
+               
+               public HtmlDocument.from_uri (string uri, int options = 0) throws GLib.Error {
+                       this.from_file (File.new_for_uri (uri), options);
+               }
+               
+               public HtmlDocument.from_file (File file, int options = 0, Cancellable? cancel = null) throws 
GLib.Error {
+                       uint8[] data;
+                       file.load_contents (cancel, out data, null);
+                       this.from_string ((string)data, options);
+               }
+               
+               public HtmlDocument.from_string (string html, int options = 0) {
+                       base.from_libxml2 (Html.Doc.read_memory (html.to_utf8(), html.length, "", null, 
options));
+               }
+               /**
+                * Search all { link GXml.Element} with a property called "class" and with a
+                * value as a class apply to a node.
+                */
+               public Gee.List<GXml.Node> get_elements_by_class_name (string klass) {
+                       var rl = new Gee.ArrayList<GXml.Node> ();
+                       var l = root.get_elements_by_property_value ("class", klass);
+                       foreach (GXml.Node n in l) {
+                               var p = n.attrs.get ("class");
+                               if (p == null) continue;
+                               if (" " in p.value) {
+                                       foreach (string ks in p.value.split (" ")) {
+                                               if (ks == klass)
+                                                       rl.add (n);
+                                       }
+                               } else if (klass == p.value) {
+                                       rl.add (n);
+                               }
+                       }
+                       return rl;
+               }
+               /**
+                * Get first node where 'id' attribute has given value.
+                */
+               public GXml.Node? get_element_by_id (string id) {
+                       var l = root.get_elements_by_property_value ("id", id);
+                       foreach (GXml.Node n in l) {
+                               var p = n.attrs.get ("id");
+                               if (p == null) continue;
+                               if (p.value == id) return n;
+                       }
+                       return null;
+               }
+       }
+}
diff --git a/gxml/Node.vala b/gxml/Node.vala
index cc47a34..7c67e18 100644
--- a/gxml/Node.vala
+++ b/gxml/Node.vala
@@ -78,9 +78,9 @@ public interface GXml.Node : Object
     foreach (var child in childs) {
       list.add_all (child.get_elements_by_property_value (property, value));
       if (child is GXml.Element) {
-        var cls = (child as GXml.Element).get_attribute (property);
+        var cls = (child as GXml.Element).attrs.get (property);
         if (cls == null) continue;
-        if (value in child.content)
+        if (value in ((GXml.Element) child).content)
             list.add (child);
       }
     }
diff --git a/gxml/libxml-Element.vala b/gxml/libxml-Element.vala
index c55bf7e..d73f8ca 100644
--- a/gxml/libxml-Element.vala
+++ b/gxml/libxml-Element.vala
@@ -444,7 +444,7 @@ namespace GXml {
                                _content = "";
                                foreach (xNode n in child_nodes) {
                                        if (n is xCharacterData) {
-                                               _content += n.data;
+                                               _content += ((xCharacterData) n).data;
                                        }
                                }
                                return _content;