/*
 * Copyright (c) 2008 Andrew Garrett.
 * Copyright (c) 2008 River Tarnell <river@wikimedia.org>
 * Derived from public domain code contributed by Victor Vasiliev.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely. This software is provided 'as-is', without any express or
 * implied warranty.
 */

#ifndef EXPRESSOR_H
#define EXPRESSOR_H

#include	<string>
#include	<vector>

#include	<boost/noncopyable.hpp>
#include	<boost/function.hpp>

#include	"aftypes.h"

namespace afp {

struct parser_grammar;

struct expressor : boost::noncopyable {
	typedef boost::function<datum (std::vector<datum>)> func_t;

	expressor();
	~expressor();

	datum evaluate(std::string const &expr) const;

	void add_variable(std::string const &name, datum value);
	void add_function(std::string const &name, func_t value);

private:
	parser_grammar *grammar_;
};

} // namespace afp

#endif	/* !EXPRESSOR_H */