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authorJonas Smedegaard <dr@jones.dk>2017-06-24 09:21:31 +0200
committerJonas Smedegaard <dr@jones.dk>2017-06-24 09:21:31 +0200
commitc21cbbf9667991d2b928562a9c199e625d3f9bba (patch)
treeffd5e6895a578102ed9055fbb02a88031154ae0b /louloulibs/xmpp/xmpp_parser.hpp
parentde62b6456bebd130f98ce6192cd63ff42e654fac (diff)
parent23a3372144215c9ba7a30d599164677284813fa4 (diff)
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New upstream version 5.0
Diffstat (limited to 'louloulibs/xmpp/xmpp_parser.hpp')
-rw-r--r--louloulibs/xmpp/xmpp_parser.hpp133
1 files changed, 0 insertions, 133 deletions
diff --git a/louloulibs/xmpp/xmpp_parser.hpp b/louloulibs/xmpp/xmpp_parser.hpp
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-#pragma once
-
-
-#include <xmpp/xmpp_stanza.hpp>
-
-#include <functional>
-
-#include <expat.h>
-
-/**
- * A SAX XML parser that builds XML nodes and spawns events when a complete
- * stanza is received (an element of level 2), or when the document is
- * opened/closed (an element of level 1)
- *
- * After a stanza_event has been spawned, we delete the whole stanza. This
- * means that even with a very long document (in XMPP the document is
- * potentially infinite), the memory is never exhausted as long as each
- * stanza is reasonnably short.
- *
- * The element names generated by expat contain the namespace of the
- * element, a colon (':') and then the actual name of the element. To get
- * an element "x" with a namespace of "http://jabber.org/protocol/muc", you
- * just look for an XmlNode named "http://jabber.org/protocol/muc:x"
- *
- * TODO: enforce the size-limit for the stanza (limit the number of childs
- * it can contain). For example forbid the parser going further than level
- * 20 (arbitrary number here), and each XML node to have more than 15 childs
- * (arbitrary number again).
- */
-class XmppParser
-{
-public:
- explicit XmppParser();
- ~XmppParser();
- XmppParser(const XmppParser&) = delete;
- XmppParser& operator=(const XmppParser&) = delete;
- XmppParser(XmppParser&&) = delete;
- XmppParser& operator=(XmppParser&&) = delete;
-
-public:
- /**
- * Feed the parser with some XML data
- */
- int feed(const char* data, const int len, const bool is_final);
- /**
- * Parse the data placed in the parser buffer
- */
- int parse(const int size, const bool is_final);
- /**
- * Reset the parser, so it can be used from scratch afterward
- */
- void reset();
- /**
- * Get a buffer provided by the xml parser.
- */
- void* get_buffer(const size_t size) const;
- /**
- * Add one callback for the various events that this parser can spawn.
- */
- void add_stanza_callback(std::function<void(const Stanza&)>&& callback);
- void add_stream_open_callback(std::function<void(const XmlNode&)>&& callback);
- void add_stream_close_callback(std::function<void(const XmlNode&)>&& callback);
-
- /**
- * Called when a new XML element has been opened. We instanciate a new
- * XmlNode and set it as our current node. The parent of this new node is
- * the previous "current" node. We have all the element's attributes in
- * this event.
- *
- * We spawn a stream_event with this node if this is a level-1 element.
- */
- void start_element(const XML_Char* name, const XML_Char** attribute);
- /**
- * Called when an XML element has been closed. We close the current_node,
- * set our current_node as the parent of the current_node, and if that was
- * a level-2 element we spawn a stanza_event with this node.
- *
- * And we then delete the stanza (and everything under it, its children,
- * attribute, etc).
- */
- void end_element(const XML_Char* name);
- /**
- * Some inner or tail data has been parsed
- */
- void char_data(const XML_Char* data, const size_t len);
- /**
- * Calls all the stanza_callbacks one by one.
- */
- void stanza_event(const Stanza& stanza) const;
- /**
- * Calls all the stream_open_callbacks one by one. Note: the passed node is not
- * closed yet.
- */
- void stream_open_event(const XmlNode& node) const;
- /**
- * Calls all the stream_close_callbacks one by one.
- */
- void stream_close_event(const XmlNode& node) const;
-
-private:
- /**
- * Init the XML parser and install the callbacks
- */
- void init_xml_parser();
-
- /**
- * Expat structure.
- */
- XML_Parser parser;
- /**
- * The current depth in the XML document
- */
- size_t level;
- /**
- * The deepest XML node opened but not yet closed (to which we are adding
- * new children, inner or tail)
- */
- XmlNode* current_node;
- /**
- * The root node has no parent, so we keep it here: the XmppParser object
- * is its owner.
- */
- std::unique_ptr<XmlNode> root;
- /**
- * A list of callbacks to be called on an *_event, receiving the
- * concerned Stanza/XmlNode.
- */
- std::vector<std::function<void(const Stanza&)>> stanza_callbacks;
- std::vector<std::function<void(const XmlNode&)>> stream_open_callbacks;
- std::vector<std::function<void(const XmlNode&)>> stream_close_callbacks;
-};
-
-