ardour/libs/pbd/pbd/xml++.h

/*
 * Copyright (C) 2006-2016 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2006 Taybin Rutkin <taybin@taybin.com>
 * Copyright (C) 2008-2009 David Robillard <d@drobilla.net>
 * Copyright (C) 2008 Hans Baier <hansfbaier@googlemail.com>
 * Copyright (C) 2009-2011 Carl Hetherington <carl@carlh.net>
 * Copyright (C) 2015-2017 Robin Gareus <robin@gareus.org>
 * Copyright (C) 2016 Tim Mayberry <mojofunk@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef __XML_H
#define __XML_H

/* xml++.h
 * libxml++ and this file are copyright (C) 2000 by Ari Johnson, and
 * are covered by the GNU Lesser General Public License, which should be
 * included with libxml++ as the file COPYING.
 * Modified for Ardour and released under the same terms.
 */

#include <cstdarg>
#include <cstdio>
#include <memory>
#include <string>
#include <vector>

#include <libxml/parser.h>
#include <libxml/tree.h>

#include <glibmm/ustring.h>

#include "pbd/string_convert.h"
#include "pbd/libpbd_visibility.h"

class XMLTree;
class XMLNode;

class LIBPBD_API XMLProperty {
public:
	XMLProperty(const std::string& n, const std::string& v = std::string());
	~XMLProperty();

	const std::string& name() const { return _name; }
	const std::string& value() const { return _value; }
	const std::string& set_value(const std::string& v) { return _value = v; }

private:
	std::string _name;
	std::string _value;
};

typedef std::vector<XMLNode *>                   XMLNodeList;
typedef std::vector<std::shared_ptr<XMLNode> > XMLSharedNodeList;
typedef XMLNodeList::iterator                    XMLNodeIterator;
typedef XMLNodeList::const_iterator              XMLNodeConstIterator;
typedef std::vector<XMLProperty*>                XMLPropertyList;
typedef XMLPropertyList::iterator                XMLPropertyIterator;
typedef XMLPropertyList::const_iterator          XMLPropertyConstIterator;

class LIBPBD_API XMLTree {
public:
	XMLTree();
	XMLTree(const std::string& fn, bool validate = false);
	XMLTree(const XMLTree*);
	~XMLTree();

	XMLNode* root() const         { return _root; }
	XMLNode* set_root(XMLNode* n) { return _root = n; }

	const std::string& filename() const               { return _filename; }
	const std::string& set_filename(const std::string& fn) { return _filename = fn; }

	int compression() const { return _compression; }
	int set_compression(int);

	bool read() { return read_internal(false); }
	bool read(const std::string& fn) { set_filename(fn); return read_internal(false); }
	bool read_and_validate() { return read_internal(true); }
	bool read_and_validate(const std::string& fn) { set_filename(fn); return read_internal(true); }
	bool read_buffer(char const*, bool to_tree_doc = false);

	bool write() const;
	bool write(const std::string& fn) { set_filename(fn); return write(); }

	void debug (FILE*) const;

	const std::string& write_buffer() const;

	std::shared_ptr<XMLSharedNodeList> find(const std::string xpath, XMLNode* = 0) const;

private:
	bool read_internal(bool validate);

	std::string _filename;
	XMLNode*    _root;
	xmlDocPtr   _doc;
	int         _compression;
};

class LIBPBD_API XMLNode {
public:
	XMLNode(const std::string& name);
	XMLNode(const std::string& name, const std::string& content);
	XMLNode(const XMLNode& other);
	~XMLNode();

	XMLNode& operator= (const XMLNode& other);

	bool operator== (const XMLNode& other) const;
	bool operator!= (const XMLNode& other) const;

	const std::string& name() const { return _name; }

	bool          is_content() const { return _is_content; }
	const std::string& content()    const { return _content; }
	const std::string& set_content(const std::string&);
	XMLNode*      add_content(const std::string& s = std::string());

	const std::string& child_content() const;

	const XMLNodeList& children(const std::string& str = std::string()) const;
	XMLNode* child(const char*) const;
	XMLNode* add_child(const char *);
	XMLNode* add_child_copy(const XMLNode&);
	void     add_child_nocopy(XMLNode&);

	std::string attribute_value();  //throws XMLException if attribute doesn't exist

	const XMLPropertyList& properties() const { return _proplist; }
	XMLProperty const *    property(const char*) const;
	XMLProperty const *    property(const std::string&) const;
	XMLProperty *    property(const char*);
	XMLProperty *    property(const std::string&);

	bool has_property_with_value (const std::string&, const std::string&) const;

	bool set_property (const char* name, const std::string& value);

	bool set_property (const char* name, const char* cstr) {
		return set_property (name, std::string(cstr));
	}

	bool set_property (const char* name, const Glib::ustring& ustr)
	{
		return set_property (name, ustr.raw ());
	}

	template<class T>
	bool set_property (const char* name, const T& value)
	{
		std::string str;
		if (!PBD::to_string<T> (value, str)) {
			return false;
		}
		return set_property(name, str);
	}

	bool get_property (const char* name, std::string& value) const;

	template <class T>
	bool get_property (const char* name, T& value) const
	{
		XMLProperty const* const prop = property (name);
		if (!prop) {
			return false;
		}

		return PBD::string_to<T> (prop->value (), value);
	}

	void remove_property(const std::string&);
	void remove_property_recursively(const std::string&);

	/** Remove all nodes with the name passed to remove_nodes */
	void remove_nodes (const std::string&);
	/** Remove and delete all nodes with the name passed to remove_nodes */
	void remove_nodes_and_delete (const std::string&);
	/** Remove and delete all nodes with property prop matching val */
	void remove_nodes_and_delete (const std::string& propname, const std::string& val);
	/** Remove and delete first node with given name and prop matching val */
	void remove_node_and_delete (const std::string& n, const std::string& propname, const std::string& val);

	void dump (std::ostream &, std::string p = "") const;

private:
	std::string         _name;
	bool                _is_content;
	std::string         _content;
	XMLNodeList         _children;
	XMLPropertyList     _proplist;
	mutable XMLNodeList _selected_children;

	void clear_lists ();
};

class LIBPBD_API XMLException: public std::exception {
public:
	explicit XMLException(const std::string msg) : _message(msg) {}
	virtual ~XMLException() throw() {}

	virtual const char* what() const throw() { return _message.c_str(); }

private:
	std::string _message;
};

#endif /* __XML_H */