118 lines
2.8 KiB
C++
118 lines
2.8 KiB
C++
/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#if !defined(BOOST_SPIRIT_CALC7_AST_HPP)
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#define BOOST_SPIRIT_CALC7_AST_HPP
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#include <boost/config/warning_disable.hpp>
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#include <boost/variant/recursive_variant.hpp>
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#include <boost/fusion/include/adapt_struct.hpp>
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#include <boost/fusion/include/io.hpp>
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#include <list>
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namespace client { namespace ast
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{
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///////////////////////////////////////////////////////////////////////////
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// The AST
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///////////////////////////////////////////////////////////////////////////
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struct tagged
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{
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int id; // Used to annotate the AST with the iterator position.
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// This id is used as a key to a map<int, Iterator>
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// (not really part of the AST.)
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};
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struct nil {};
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struct signed_;
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struct expression;
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struct variable : tagged
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{
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variable(std::string const& name = "") : name(name) {}
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std::string name;
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};
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typedef boost::variant<
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nil
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, unsigned int
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, variable
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, boost::recursive_wrapper<signed_>
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, boost::recursive_wrapper<expression>
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>
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operand;
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struct signed_
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{
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char sign;
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operand operand_;
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};
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struct operation
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{
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char operator_;
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operand operand_;
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};
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struct expression
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{
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operand first;
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std::list<operation> rest;
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};
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struct assignment
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{
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variable lhs;
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expression rhs;
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};
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struct variable_declaration
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{
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assignment assign;
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};
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typedef boost::variant<
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variable_declaration
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, assignment>
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statement;
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typedef std::list<statement> statement_list;
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// print functions for debugging
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inline std::ostream& operator<<(std::ostream& out, nil) { out << "nil"; return out; }
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inline std::ostream& operator<<(std::ostream& out, variable const& var) { out << var.name; return out; }
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}}
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BOOST_FUSION_ADAPT_STRUCT(
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client::ast::signed_,
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(char, sign)
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(client::ast::operand, operand_)
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)
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BOOST_FUSION_ADAPT_STRUCT(
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client::ast::operation,
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(char, operator_)
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(client::ast::operand, operand_)
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)
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BOOST_FUSION_ADAPT_STRUCT(
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client::ast::expression,
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(client::ast::operand, first)
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(std::list<client::ast::operation>, rest)
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)
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BOOST_FUSION_ADAPT_STRUCT(
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client::ast::variable_declaration,
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(client::ast::assignment, assign)
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)
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BOOST_FUSION_ADAPT_STRUCT(
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client::ast::assignment,
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(client::ast::variable, lhs)
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(client::ast::expression, rhs)
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)
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#endif
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