/*============================================================================= Copyright (c) 2001-2014 Joel de Guzman Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) =============================================================================*/ #if !defined(BOOST_SPIRIT_X3_CALC8_AST_HPP) #define BOOST_SPIRIT_X3_CALC8_AST_HPP #include <boost/spirit/home/x3/support/ast/variant.hpp> #include <boost/spirit/home/x3/support/ast/position_tagged.hpp> #include <boost/fusion/include/io.hpp> #include <list> namespace client { namespace ast { /////////////////////////////////////////////////////////////////////////// // The AST /////////////////////////////////////////////////////////////////////////// namespace x3 = boost::spirit::x3; struct nil {}; struct signed_; struct expression; struct variable : x3::position_tagged { variable(std::string const& name = "") : name(name) {} std::string name; }; struct operand : x3::variant< nil , unsigned int , variable , x3::forward_ast<signed_> , x3::forward_ast<expression> > { using base_type::base_type; using base_type::operator=; }; struct signed_ { char sign; operand operand_; }; struct operation : x3::position_tagged { char operator_; operand operand_; }; struct expression : x3::position_tagged { operand first; std::list<operation> rest; }; struct assignment : x3::position_tagged { variable lhs; expression rhs; }; struct variable_declaration { assignment assign; }; struct statement : x3::variant< variable_declaration , assignment> { using base_type::base_type; using base_type::operator=; }; typedef std::list<statement> statement_list; // print functions for debugging inline std::ostream& operator<<(std::ostream& out, nil) { out << "nil"; return out; } inline std::ostream& operator<<(std::ostream& out, variable const& var) { out << var.name; return out; } }} #endif