1 /*============================================================================= 2 Copyright (c) 2009 Chris Hoeppler 3 Copyright (c) 2014 Lee Clagett 4 5 Distributed under the Boost Software License, Version 1.0. (See accompanying 6 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 7 ==============================================================================*/ 8 9 #if !defined(BOOST_SPIRIT_X3_CONFIX_MAY_30_2014_1819PM) 10 #define BOOST_SPIRIT_X3_CONFIX_MAY_30_2014_1819PM 11 12 #include <boost/spirit/home/x3/core/parser.hpp> 13 14 namespace boost { namespace spirit { namespace x3 15 { 16 template<typename Prefix, typename Subject, typename Postfix> 17 struct confix_directive : 18 unary_parser<Subject, confix_directive<Prefix, Subject, Postfix>> 19 { 20 typedef unary_parser< 21 Subject, confix_directive<Prefix, Subject, Postfix>> base_type; 22 static bool const is_pass_through_unary = true; 23 static bool const handles_container = Subject::handles_container; 24 confix_directiveboost::spirit::x3::confix_directive25 constexpr confix_directive(Prefix const& prefix 26 , Subject const& subject 27 , Postfix const& postfix) : 28 base_type(subject), 29 prefix(prefix), 30 postfix(postfix) 31 { 32 } 33 34 template<typename Iterator, typename Context 35 , typename RContext, typename Attribute> parseboost::spirit::x3::confix_directive36 bool parse( 37 Iterator& first, Iterator const& last 38 , Context const& context, RContext& rcontext, Attribute& attr) const 39 { 40 Iterator save = first; 41 42 if (!(prefix.parse(first, last, context, rcontext, unused) && 43 this->subject.parse(first, last, context, rcontext, attr) && 44 postfix.parse(first, last, context, rcontext, unused))) 45 { 46 first = save; 47 return false; 48 } 49 50 return true; 51 } 52 53 Prefix prefix; 54 Postfix postfix; 55 }; 56 57 template<typename Prefix, typename Postfix> 58 struct confix_gen 59 { 60 template<typename Subject> 61 constexpr confix_directive< 62 Prefix, typename extension::as_parser<Subject>::value_type, Postfix> operator []boost::spirit::x3::confix_gen63 operator[](Subject const& subject) const 64 { 65 return { prefix, as_parser(subject), postfix }; 66 } 67 68 Prefix prefix; 69 Postfix postfix; 70 }; 71 72 73 template<typename Prefix, typename Postfix> 74 constexpr confix_gen<typename extension::as_parser<Prefix>::value_type, 75 typename extension::as_parser<Postfix>::value_type> confix(Prefix const & prefix,Postfix const & postfix)76 confix(Prefix const& prefix, Postfix const& postfix) 77 { 78 return { as_parser(prefix), as_parser(postfix) }; 79 } 80 81 }}} 82 83 #endif 84