[gxml] StreamReader: add room on GXml.Element

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit e2c7a3ceb8cbb1e60bb9920c0e926efc82f90417
Author: Daniel Espinosa <esodan gmail com>
Date:   Tue Jul 23 13:29:32 2019 -0500

    StreamReader: add room on GXml.Element

 gxml/Element.vala | 29 +++++++++++++++++++++++++----
 gxml/XParser.vala |  5 +++++
 2 files changed, 30 insertions(+), 4 deletions(-)
---
diff --git a/gxml/Element.vala b/gxml/Element.vala
index 89d99c2..75bc133 100644
--- a/gxml/Element.vala
+++ b/gxml/Element.vala
@@ -767,22 +767,43 @@ public class GXml.Element : GXml.Node,
    * use {@link read_unparsed}.
    */
   public bool parse_children { get; set; default = true; }
+
+  private string _unparsed = null;
   /**
    * Temporally stores, all unparsed children as plain string. See {@link parse_children}.
    *
    * If it is null, means all children have been already parsed.
    */
-  public string unparsed { get; set; }
+  public string unparsed {
+    get {
+      if (read_buffer != null) {
+        return (string) read_buffer.data;
+      }
+      return _unparsed;
+    }
+    set {
+      _unparsed = value;
+    }
+  }
   /**
    * Parse all children, adding them to current node, stored in {@link unparsed}.
    * Once it finish, sets {@link unparsed} to null.
    */
   public void read_unparsed () throws GLib.Error {
-    if (unparsed == null) return;
     var parser = new XParser (this);
-    parser.read_child_nodes_string (unparsed);
-    unparsed = null;
+    if (unparsed != null) {
+      parser.read_child_nodes_string (unparsed);
+      unparsed = null;
+    }
+    if (read_buffer != null) {
+      parser.read_child_nodes_string ((string) read_buffer.data);
+      read_buffer = null;
+    }
   }
+  /**
+   * On memory {@link MemoryOutputStream} with the unparsed
+   * string of the element
+   */
   public MemoryOutputStream read_buffer { get; set; }
 }
 
diff --git a/gxml/XParser.vala b/gxml/XParser.vala
index 66dbec9..65d7cd3 100644
--- a/gxml/XParser.vala
+++ b/gxml/XParser.vala
@@ -222,6 +222,11 @@ public class GXml.XParser : GLib.Object, GXml.Parser {
       }
     }
   }
+  public void read_child_nodes_string (string str) throws GLib.Error {
+    tr = new TextReader.for_memory ((char[]) str.data, (int) str.data.length, "/gxml_memory");
+    read_child_nodes (_node);
+    tr = null;
+  }
   public void read_child_nodes_stream (GLib.InputStream istream) throws GLib.Error {
     var b = new MemoryOutputStream.resizable ();
     b.splice (istream, 0);