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-rw-r--r--src/xmpp/xmpp_parser.cpp172
1 files changed, 172 insertions, 0 deletions
diff --git a/src/xmpp/xmpp_parser.cpp b/src/xmpp/xmpp_parser.cpp
new file mode 100644
index 0000000..0488be9
--- /dev/null
+++ b/src/xmpp/xmpp_parser.cpp
@@ -0,0 +1,172 @@
+#include <xmpp/xmpp_parser.hpp>
+#include <xmpp/xmpp_stanza.hpp>
+
+#include <logger/logger.hpp>
+
+/**
+ * Expat handlers. Called by the Expat library, never by ourself.
+ * They just forward the call to the XmppParser corresponding methods.
+ */
+
+static void start_element_handler(void* user_data, const XML_Char* name, const XML_Char** atts)
+{
+ static_cast<XmppParser*>(user_data)->start_element(name, atts);
+}
+
+static void end_element_handler(void* user_data, const XML_Char* name)
+{
+ static_cast<XmppParser*>(user_data)->end_element(name);
+}
+
+static void character_data_handler(void *user_data, const XML_Char *s, int len)
+{
+ static_cast<XmppParser*>(user_data)->char_data(s, len);
+}
+
+/**
+ * XmppParser class
+ */
+
+XmppParser::XmppParser():
+ level(0),
+ current_node(nullptr),
+ root(nullptr)
+{
+ this->init_xml_parser();
+}
+
+void XmppParser::init_xml_parser()
+{
+ // Create the expat parser
+ this->parser = XML_ParserCreateNS("UTF-8", ':');
+ XML_SetUserData(this->parser, static_cast<void*>(this));
+
+ // Install Expat handlers
+ XML_SetElementHandler(this->parser, &start_element_handler, &end_element_handler);
+ XML_SetCharacterDataHandler(this->parser, &character_data_handler);
+}
+
+XmppParser::~XmppParser()
+{
+ XML_ParserFree(this->parser);
+}
+
+int XmppParser::feed(const char* data, const int len, const bool is_final)
+{
+ int res = XML_Parse(this->parser, data, len, is_final);
+ if (res == XML_STATUS_ERROR &&
+ (XML_GetErrorCode(this->parser) != XML_ERROR_FINISHED))
+ log_error("Xml_Parse encountered an error: ",
+ XML_ErrorString(XML_GetErrorCode(this->parser)));
+ return res;
+}
+
+int XmppParser::parse(const int len, const bool is_final)
+{
+ int res = XML_ParseBuffer(this->parser, len, is_final);
+ if (res == XML_STATUS_ERROR)
+ log_error("Xml_Parsebuffer encountered an error: ",
+ XML_ErrorString(XML_GetErrorCode(this->parser)));
+ return res;
+}
+
+void XmppParser::reset()
+{
+ XML_ParserFree(this->parser);
+ this->init_xml_parser();
+ this->current_node = nullptr;
+ this->root.reset(nullptr);
+ this->level = 0;
+}
+
+void* XmppParser::get_buffer(const size_t size) const
+{
+ return XML_GetBuffer(this->parser, static_cast<int>(size));
+}
+
+void XmppParser::start_element(const XML_Char* name, const XML_Char** attribute)
+{
+ this->level++;
+
+ auto new_node = std::make_unique<XmlNode>(name, this->current_node);
+ auto new_node_ptr = new_node.get();
+ if (this->current_node)
+ this->current_node->add_child(std::move(new_node));
+ else
+ this->root = std::move(new_node);
+ this->current_node = new_node_ptr;
+ 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::end_element(const XML_Char*)
+{
+ this->level--;
+ if (this->level == 0)
+ { // End of the whole stream
+ this->stream_close_event(*this->current_node);
+ this->current_node = nullptr;
+ this->root.reset();
+ }
+ else
+ {
+ auto parent = this->current_node->get_parent();
+ if (this->level == 1)
+ { // End of a stanza
+ this->stanza_event(*this->current_node);
+ // Note: deleting all the children of our parent deletes ourself,
+ // so current_node is an invalid pointer after this line
+ parent->delete_all_children();
+ }
+ this->current_node = parent;
+ }
+}
+
+void XmppParser::char_data(const XML_Char* data, const size_t len)
+{
+ if (this->current_node->has_children())
+ this->current_node->get_last_child()->add_to_tail({data, len});
+ else
+ this->current_node->add_to_inner({data, len});
+}
+
+void XmppParser::stanza_event(const Stanza& stanza) const
+{
+ for (const auto& callback: this->stanza_callbacks)
+ {
+ try {
+ callback(stanza);
+ } catch (const std::exception& e) {
+ log_error("Unhandled exception: ", e.what());
+ }
+ }
+}
+
+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::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));
+}