Add an XmppParser, and Stanza classes

Generate events on stanza and stream open/close.
Create Stanza and serialize them.

Note: XML namespaces are not handled yet.

src/xmpp/xmpp_parser.cpp

@@ -0,0 +1,103 @@
+#include <xmpp/xmpp_parser.hpp>
+#include <xmpp/xmpp_stanza.hpp>
+
+#include <iostream>
+
+XmppParser::XmppParser():
+  level(0),
+  current_node(nullptr)
+{
+}
+
+XmppParser::~XmppParser()
+{
+  if (this->current_node)
+    delete this->current_node;
+}
+
+void XmppParser::startElement(const XML_Char* name, const XML_Char** attribute)
+{
+  level++;
+
+  XmlNode* new_node = new XmlNode(name, this->current_node);
+  if (this->current_node)
+    this->current_node->add_child(new_node);
+  this->current_node = new_node;
+  for (size_t i = 0; attribute[i]; i += 2)
+    this->current_node->set_attribute(attribute[i], attribute[i+1]);
+  if (this->level == 1)
+    this->stream_open_event(*this->current_node);
+}
+
+void XmppParser::endElement(const XML_Char* name)
+{
+  assert(name == this->current_node->get_name());
+  level--;
+  this->current_node->close();
+  if (level == 1)
+    {
+      this->stanza_event(*this->current_node);
+    }
+  if (level == 0)
+    {
+      this->stream_close_event(*this->current_node);
+      delete this->current_node;
+      this->current_node = nullptr;
+    }
+  else
+    this->current_node = this->current_node->get_parent();
+  if (level == 1)
+    this->current_node->delete_all_children();
+}
+
+void XmppParser::charData(const XML_Char* data, int len)
+{
+  if (this->current_node->has_children())
+    this->current_node->get_last_child()->set_tail(std::string(data, len));
+  else
+    this->current_node->set_inner(std::string(data, len));
+}
+
+void XmppParser::startNamespace(const XML_Char* prefix, const XML_Char* uri)
+{
+  std::cout << "startNamespace: " << prefix << ":" << uri << std::endl;
+  this->namespaces.emplace(std::make_pair(prefix, uri));
+}
+
+void XmppParser::stanza_event(const Stanza& stanza) const
+{
+  for (const auto& callback: this->stanza_callbacks)
+    callback(stanza);
+}
+
+void XmppParser::stream_open_event(const XmlNode& node) const
+{
+  for (const auto& callback: this->stream_open_callbacks)
+    callback(node);
+}
+
+void XmppParser::stream_close_event(const XmlNode& node) const
+{
+  for (const auto& callback: this->stream_close_callbacks)
+    callback(node);
+}
+
+void XmppParser::endNamespace(const XML_Char* coucou)
+{
+  std::cout << "endNamespace: " << coucou << std::endl;
+}
+
+void XmppParser::add_stanza_callback(std::function<void(const Stanza&)>&& callback)
+{
+  this->stanza_callbacks.emplace_back(std::move(callback));
+}
+
+void XmppParser::add_stream_open_callback(std::function<void(const XmlNode&)>&& callback)
+{
+  this->stream_open_callbacks.emplace_back(std::move(callback));
+}
+
+void XmppParser::add_stream_close_callback(std::function<void(const XmlNode&)>&& callback)
+{
+  this->stream_close_callbacks.emplace_back(std::move(callback));
+}