/** @file symbol.h
 *
 *  Interface to GiNaC's symbolic objects. */

/*
 *  GiNaC Copyright (C) 1999-2008 Johannes Gutenberg University Mainz, Germany
 *
 *  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 __GINAC_SYMBOL_H__
#define __GINAC_SYMBOL_H__

#include <string>
#include <typeinfo>
#include "basic.h"
#include "ex.h"
#include "ptr.h"
#include "archive.h"

namespace GiNaC {

/** Basic CAS symbol.  It has a name because it must know how to output itself.
 */
class symbol : public basic
{
	GINAC_DECLARE_REGISTERED_CLASS(symbol, basic)
	// other constructors
public:
	explicit symbol(const std::string & initname);
	symbol(const std::string & initname, const std::string & texname);
	
	// functions overriding virtual functions from base classes
public:
	bool info(unsigned inf) const;
	ex eval(int level = 0) const { return *this; } // for performance reasons
	ex evalf(int level = 0) const { return *this; } // overwrites basic::evalf() for performance reasons
	ex series(const relational & s, int order, unsigned options = 0) const;
	ex subs(const exmap & m, unsigned options = 0) const { return subs_one_level(m, options); } // overwrites basic::subs() for performance reasons
	ex normal(exmap & repl, exmap & rev_lookup, int level = 0) const;
	ex to_rational(exmap & repl) const;
	ex to_polynomial(exmap & repl) const;
	ex conjugate() const;
	ex real_part() const;
	ex imag_part() const;
	bool is_polynomial(const ex & var) const;
	/** Save (a.k.a. serialize) object into archive. */
	void archive(archive_node& n) const;
	/** Read (a.k.a. deserialize) object from archive. */
	void read_archive(const archive_node& n, lst& syms);
protected:
	ex derivative(const symbol & s) const;
	bool is_equal_same_type(const basic & other) const;
	unsigned calchash() const;
	
	// non-virtual functions in this class
public:
	void set_name(const std::string & n) { name = n; }
	std::string get_name() const { return name; }
	virtual unsigned get_domain() const { return domain::complex; }
protected:
	void do_print(const print_context & c, unsigned level) const;
	void do_print_latex(const print_latex & c, unsigned level) const;
	void do_print_tree(const print_tree & c, unsigned level) const;
	void do_print_python_repr(const print_python_repr & c, unsigned level) const;

// member variables

protected:
	unsigned serial;                 ///< unique serial number for comparison
	std::string name;                ///< printname of this symbol
	std::string TeX_name;            ///< LaTeX name of this symbol
private:
	static unsigned next_serial;
};
GINAC_DECLARE_UNARCHIVER(symbol);


/** Specialization of symbol to real domain */
class realsymbol : public symbol
{
public:
	realsymbol();
	explicit realsymbol(const std::string & initname);
	realsymbol(const std::string & initname, const std::string & texname);

	unsigned get_domain() const { return domain::real; }

	ex conjugate() const { return *this; }
	ex real_part() const { return *this; }
	ex imag_part() const { return 0; }

	realsymbol* duplicate() const { return new realsymbol(*this); }
};
GINAC_DECLARE_UNARCHIVER(realsymbol);


/** Specialization of symbol to real domain */
class possymbol : public realsymbol
{
public:
	possymbol();
	explicit possymbol(const std::string & initname);
	possymbol(const std::string & initname, const std::string & texname);

	unsigned get_domain() const { return domain::positive; }

	possymbol* duplicate() const { return new possymbol(*this); }
};
GINAC_DECLARE_UNARCHIVER(possymbol);

} // namespace GiNaC

#endif // ndef __GINAC_SYMBOL_H__