| 1 | /*============================================================================= |
|---|---|
| 2 | Copyright (c) 2001-2014 Joel de Guzman |
| 3 | |
| 4 | Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 5 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| 6 | =============================================================================*/ |
| 7 | #if !defined(BOOST_SPIRIT_X3_CALC7_EXPRESSION_DEF_HPP) |
| 8 | #define BOOST_SPIRIT_X3_CALC7_EXPRESSION_DEF_HPP |
| 9 | |
| 10 | #include <boost/spirit/home/x3.hpp> |
| 11 | #include "ast.hpp" |
| 12 | #include "ast_adapted.hpp" |
| 13 | #include "expression.hpp" |
| 14 | #include "error_handler.hpp" |
| 15 | |
| 16 | namespace client { namespace calculator_grammar |
| 17 | { |
| 18 | using x3::uint_; |
| 19 | using x3::char_; |
| 20 | |
| 21 | struct expression_class; |
| 22 | struct term_class; |
| 23 | struct factor_class; |
| 24 | |
| 25 | typedef x3::rule<expression_class, ast::expression> expression_type; |
| 26 | typedef x3::rule<term_class, ast::expression> term_type; |
| 27 | typedef x3::rule<factor_class, ast::operand> factor_type; |
| 28 | |
| 29 | expression_type const expression = "expression"; |
| 30 | term_type const term = "term"; |
| 31 | factor_type const factor = "factor"; |
| 32 | |
| 33 | auto const expression_def = |
| 34 | term |
| 35 | >> *( (char_('+') > term) |
| 36 | | (char_('-') > term) |
| 37 | ) |
| 38 | ; |
| 39 | |
| 40 | auto const term_def = |
| 41 | factor |
| 42 | >> *( (char_('*') > factor) |
| 43 | | (char_('/') > factor) |
| 44 | ) |
| 45 | ; |
| 46 | |
| 47 | auto const factor_def = |
| 48 | uint_ |
| 49 | | '(' > expression > ')' |
| 50 | | (char_('-') > factor) |
| 51 | | (char_('+') > factor) |
| 52 | ; |
| 53 | |
| 54 | BOOST_SPIRIT_DEFINE( |
| 55 | expression |
| 56 | , term |
| 57 | , factor |
| 58 | ); |
| 59 | |
| 60 | struct expression_class : error_handler {}; |
| 61 | }} |
| 62 | |
| 63 | namespace client |
| 64 | { |
| 65 | calculator_grammar::expression_type expression() |
| 66 | { |
| 67 | return calculator_grammar::expression; |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | #endif |
| 72 |