[gxml: 6/7] GomObject: Added initial support delayed parsing

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit fc695ff25e4b70108b6d1f59f58109b54f37390c
Author: Daniel Espinosa <esodan gmail com>
Date:   Sat Apr 8 19:39:51 2017 -0500

    GomObject: Added initial support delayed parsing

 gxml/GomElement.vala |    3 +++
 gxml/GomObject.vala  |   22 ++++++++++++++++++++++
 gxml/XParser.vala    |    6 ++++--
 3 files changed, 29 insertions(+), 2 deletions(-)
---
diff --git a/gxml/GomElement.vala b/gxml/GomElement.vala
index 82b3b81..f9a1404 100644
--- a/gxml/GomElement.vala
+++ b/gxml/GomElement.vala
@@ -632,6 +632,9 @@ public class GXml.GomElement : GomNode,
     }
     return l;
   }
+  // GomObject
+  public bool parse_children { get; set; default = true; }
+  public string unparsed { get; set; }
 }
 
 
diff --git a/gxml/GomObject.vala b/gxml/GomObject.vala
index 7a0736e..4658a6b 100644
--- a/gxml/GomObject.vala
+++ b/gxml/GomObject.vala
@@ -35,6 +35,28 @@ public interface GXml.GomObject : GLib.Object,
                                   DomNode,
                                   DomElement {
   /**
+   * Controls if children should be parsed or delayed
+   */
+  public abstract bool parse_children { get; set; default = true; }
+  /**
+   * Holds unparsed text for this {@link GomElement}.
+   *
+   * If {@link parse_children} is true this will hold a string with all childrens
+   * for this {@link GomElement}. It is set to null if {@link parse_children} is false
+   * and {@link read_children} is called.
+   */
+  public abstract string unparsed { get; set; }
+  /**
+   * Reads all children stored in {@link unparsed} string.
+   *
+   * After this method is called, {@link unparsed} is freed.
+   */
+  public virtual void read_children () throws GLib.Error {
+    if (unparsed != null);
+    (this as GomElement).read_from_string (unparsed);
+    unparsed = null;
+  }
+  /**
    * Returns a list with all properties' nick with "::" prefix. Nick name,
    * with "::" prefix will be used on serialization to an attribute's name.
    */
diff --git a/gxml/XParser.vala b/gxml/XParser.vala
index 466751a..189ba90 100644
--- a/gxml/XParser.vala
+++ b/gxml/XParser.vala
@@ -139,8 +139,10 @@ public class GXml.XParser : Object, GXml.Parser {
 #endif
     if (current_is_element () && (node is DomDocument))
       read_child_element (node);
-    else
-      read_child_nodes (node);
+    else {
+      if ((node as GomObject).parse_children)
+        read_child_nodes (node);
+    }
   }
   /**
    * Use parser to go to next parsed node.