mpapierski/gist:5687079

## gistfile1.cpp
#include <iostream>
#include <libxml/parser.h>
#include <libxml/tree.h>
#include <libxml/HTMLtree.h>

struct xml_attribute
{
  xmlNodePtr node_;
	std::string key_;
	xml_attribute(xmlNodePtr node, std::string const & key)
		: node_(node)
		, key_(key)
	{
	}
	xml_attribute & operator=(std::string const & value)
	{
		xmlNewProp(node_, reinterpret_cast<const xmlChar *>(key_.c_str()), reinterpret_cast<const xmlChar *>(value.c_str()));
		return *this;
	}
};

struct dom_element
{
	xmlNodePtr node_;
	dom_element(const char * element_name)
		: node_(xmlNewNode(NULL, reinterpret_cast<const xmlChar *>(element_name)))
	{
		if (!node_)
		{
			throw std::bad_alloc();
		}
	}
	dom_element(dom_element const & x)
		: node_(xmlCopyNode(x.node_, 1))
	{
	}
	~dom_element()
	{
		if (node_)
			xmlFreeNode(node_);
	}

	void addChild(dom_element el)
	{
		xmlAddChild(node_, el.node_);
		el.node_ = NULL;
	}
	xml_attribute operator[](std::string const & key)
	{
		return xml_attribute(node_, key);
	}
};

struct document
{
	xmlDocPtr doc_;
	bool isHTML5_;
	document(bool isHTML5 = true)
		: doc_(xmlNewDoc(NULL))
		, isHTML5_(isHTML5)
	{
		if (!doc_)
		{
			throw std::bad_alloc();
		}
	}
	document(document const & doc)
		: doc_(xmlCopyDocument(doc.doc_))
		, isHTML5_(doc.isHTML5_)
	{

	}
	~document()
	{
		xmlFreeDoc(doc_);
	}
	friend std::ostream & operator<<(std::ostream & lhs, document const & doc)
	{
		if (doc.isHTML5_)
		{
			lhs << "<!doctype html>" << std::endl;
		}
		xmlChar * xmlbuff = NULL;
		int buffersize = 0;
		htmlDocDumpMemory(doc.doc_, &xmlbuff, &buffersize);
		try
		{
			lhs << reinterpret_cast<char *>(xmlbuff);
			xmlFree(xmlbuff);
		} catch (...)
		{
			xmlFree(xmlbuff);
			throw;
		}
		return lhs;
	}
	void addChild(dom_element el)
	{
		xmlDocSetRootElement(doc_, el.node_);
		el.node_ = NULL;
	}
};

int
main()
{
	document doc;
	dom_element html("html");
	html["lang"] = "en";
	dom_element head("head");
	head.addChild(dom_element("title"));
	html.addChild(head);
	html.addChild(dom_element("body"));
	doc.addChild(html);
	std::cout << doc << std::endl;
}
	#include <iostream>
	#include <libxml/parser.h>
	#include <libxml/tree.h>
	#include <libxml/HTMLtree.h>

	struct xml_attribute
	{
	xmlNodePtr node_;
	std::string key_;
	xml_attribute(xmlNodePtr node, std::string const & key)
	: node_(node)
	, key_(key)
	{
	}
	xml_attribute & operator=(std::string const & value)
	{
	xmlNewProp(node_, reinterpret_cast<const xmlChar >(key_.c_str()), reinterpret_cast<const xmlChar >(value.c_str()));
	return *this;
	}
	};

	struct dom_element
	{
	xmlNodePtr node_;
	dom_element(const char * element_name)
	: node_(xmlNewNode(NULL, reinterpret_cast<const xmlChar *>(element_name)))
	{
	if (!node_)
	{
	throw std::bad_alloc();
	}
	}
	dom_element(dom_element const & x)
	: node_(xmlCopyNode(x.node_, 1))
	{
	}
	~dom_element()
	{
	if (node_)
	xmlFreeNode(node_);
	}

	void addChild(dom_element el)
	{
	xmlAddChild(node_, el.node_);
	el.node_ = NULL;
	}
	xml_attribute operator[](std::string const & key)
	{
	return xml_attribute(node_, key);
	}
	};

	struct document
	{
	xmlDocPtr doc_;
	bool isHTML5_;
	document(bool isHTML5 = true)
	: doc_(xmlNewDoc(NULL))
	, isHTML5_(isHTML5)
	{
	if (!doc_)
	{
	throw std::bad_alloc();
	}
	}
	document(document const & doc)
	: doc_(xmlCopyDocument(doc.doc_))
	, isHTML5_(doc.isHTML5_)
	{

	}
	~document()
	{
	xmlFreeDoc(doc_);
	}
	friend std::ostream & operator<<(std::ostream & lhs, document const & doc)
	{
	if (doc.isHTML5_)
	{
	lhs << "<!doctype html>" << std::endl;
	}
	xmlChar * xmlbuff = NULL;
	int buffersize = 0;
	htmlDocDumpMemory(doc.doc_, &xmlbuff, &buffersize);
	try
	{
	lhs << reinterpret_cast<char *>(xmlbuff);
	xmlFree(xmlbuff);
	} catch (...)
	{
	xmlFree(xmlbuff);
	throw;
	}
	return lhs;
	}
	void addChild(dom_element el)
	{
	xmlDocSetRootElement(doc_, el.node_);
	el.node_ = NULL;
	}
	};

	int
	main()
	{
	document doc;
	dom_element html("html");
	html["lang"] = "en";
	dom_element head("head");
	head.addChild(dom_element("title"));
	html.addChild(head);
	html.addChild(dom_element("body"));
	doc.addChild(html);
	std::cout << doc << std::endl;
	}