| /*============================================================================= |
| Copyright (c) 2009 Chris Hoeppler |
| Copyright (c) 2014 Lee Clagett |
| |
| 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_CONFIX_MAY_30_2014_1819PM) |
| #define BOOST_SPIRIT_X3_CONFIX_MAY_30_2014_1819PM |
| |
| #include <boost/spirit/home/x3/core/parser.hpp> |
| |
| namespace boost { namespace spirit { namespace x3 |
| { |
| template<typename Prefix, typename Subject, typename Postfix> |
| struct confix_directive : |
| unary_parser<Subject, confix_directive<Prefix, Subject, Postfix>> |
| { |
| typedef unary_parser< |
| Subject, confix_directive<Prefix, Subject, Postfix>> base_type; |
| static bool const is_pass_through_unary = true; |
| static bool const handles_container = Subject::handles_container; |
| |
| constexpr confix_directive(Prefix const& prefix |
| , Subject const& subject |
| , Postfix const& postfix) : |
| base_type(subject), |
| prefix(prefix), |
| postfix(postfix) |
| { |
| } |
| |
| template<typename Iterator, typename Context |
| , typename RContext, typename Attribute> |
| bool parse( |
| Iterator& first, Iterator const& last |
| , Context const& context, RContext& rcontext, Attribute& attr) const |
| { |
| Iterator save = first; |
| |
| if (!(prefix.parse(first, last, context, rcontext, unused) && |
| this->subject.parse(first, last, context, rcontext, attr) && |
| postfix.parse(first, last, context, rcontext, unused))) |
| { |
| first = save; |
| return false; |
| } |
| |
| return true; |
| } |
| |
| Prefix prefix; |
| Postfix postfix; |
| }; |
| |
| template<typename Prefix, typename Postfix> |
| struct confix_gen |
| { |
| template<typename Subject> |
| constexpr confix_directive< |
| Prefix, typename extension::as_parser<Subject>::value_type, Postfix> |
| operator[](Subject const& subject) const |
| { |
| return { prefix, as_parser(subject), postfix }; |
| } |
| |
| Prefix prefix; |
| Postfix postfix; |
| }; |
| |
| |
| template<typename Prefix, typename Postfix> |
| constexpr confix_gen<typename extension::as_parser<Prefix>::value_type, |
| typename extension::as_parser<Postfix>::value_type> |
| confix(Prefix const& prefix, Postfix const& postfix) |
| { |
| return { as_parser(prefix), as_parser(postfix) }; |
| } |
| |
| }}} |
| |
| #endif |
