/*************************************************************************
** Subfont.h                                                            **
**                                                                      **
** This file is part of dvisvgm -- a fast DVI to SVG converter          **
** Copyright (C) 2005-2016 Martin Gieseking <martin.gieseking@uos.de>   **
**                                                                      **
** 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 3 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, see <http://www.gnu.org/licenses/>. **
*************************************************************************/

#ifndef DVISVGM_SUBFONT_H
#define DVISVGM_SUBFONT_H

#include <istream>
#include <map>
#include <sstream>
#include <string>
#include <vector>
#include "MessageException.h"
#include "types.h"


class Subfont;


/** Represents a collection of subfont mappings as defined in a .sfd file, and
 *  encapsulates the evaluation of these files. */
class SubfontDefinition
{
	typedef std::map<std::string, Subfont*> Subfonts;
	typedef Subfonts::iterator Iterator;
	typedef Subfonts::const_iterator ConstIterator;
	public:
		~SubfontDefinition ();
		static SubfontDefinition* lookup (const std::string &name);
//		int getIDs (std::vector<std::string> &ids) const;
		const std::string& name() const {return _sfname;}
		std::string filename() const    {return _sfname+".sfd";}
		Subfont* subfont (const std::string &id) const;
		int subfonts (std::vector<Subfont*> &sfs) const;
		const char* path () const;

	protected:
		SubfontDefinition (const std::string &name, const char *fpath);
		SubfontDefinition (const SubfontDefinition &sfd) {}

	private:
		std::string _sfname; ///< name of subfont
		Subfonts _subfonts;  ///< all subfonts defined in the corresponding .sfd file
};


/** Represents a single subfont mapping defined in a SubfontDefinition (.sfd file). */
class Subfont
{
	friend class SubfontDefinition;
	public:
		~Subfont();
		const std::string& id () const {return _id;}
		UInt16 decode (unsigned char c);

	protected:
		Subfont (SubfontDefinition &sfd, const std::string &id) : _sfd(sfd), _id(id), _mapping(0) {}
		bool read ();

	private:
		SubfontDefinition &_sfd;  ///< SubfontDefinition where this Subfont belongs to
		const std::string &_id;   ///< id of this subfont as specified in the .sfd file
		UInt16 *_mapping;         ///< the character mapping table with 256 entries
};


class SubfontException : public MessageException
{
	public:
		SubfontException (const std::string &msg, const std::string &fname, int lineno=0)
				  : MessageException(msg), _fname(fname), _lineno(lineno) {}

		SubfontException (const std::ostream &oss, const std::string &fname, int lineno=0)
				  : MessageException(dynamic_cast<const std::ostringstream&>(oss).str()), _fname(fname), _lineno(lineno) {}

		virtual ~SubfontException () throw() {}

		const char* filename () const {return _fname.c_str();}
		int lineno () const {return _lineno;}

	private:
		std::string _fname;
		int _lineno;
};

#endif
