84 lines
2.7 KiB
C++
84 lines
2.7 KiB
C++
/*=============================================================================
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Copyright (c) 2009 Chris Hoeppler
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Copyright (c) 2014 Lee Clagett
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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_X3_CONFIX_MAY_30_2014_1819PM)
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#define BOOST_SPIRIT_X3_CONFIX_MAY_30_2014_1819PM
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#include <boost/spirit/home/x3/core/parser.hpp>
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namespace boost { namespace spirit { namespace x3
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{
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template<typename Prefix, typename Subject, typename Postfix>
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struct confix_directive :
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unary_parser<Subject, confix_directive<Prefix, Subject, Postfix>>
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{
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typedef unary_parser<
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Subject, confix_directive<Prefix, Subject, Postfix>> base_type;
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static bool const is_pass_through_unary = true;
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static bool const handles_container = Subject::handles_container;
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constexpr confix_directive(Prefix const& prefix
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, Subject const& subject
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, Postfix const& postfix) :
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base_type(subject),
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prefix(prefix),
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postfix(postfix)
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{
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}
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template<typename Iterator, typename Context
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, typename RContext, typename Attribute>
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bool parse(
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Iterator& first, Iterator const& last
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, Context const& context, RContext& rcontext, Attribute& attr) const
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{
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Iterator save = first;
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if (!(prefix.parse(first, last, context, rcontext, unused) &&
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this->subject.parse(first, last, context, rcontext, attr) &&
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postfix.parse(first, last, context, rcontext, unused)))
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{
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first = save;
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return false;
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}
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return true;
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}
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Prefix prefix;
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Postfix postfix;
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};
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template<typename Prefix, typename Postfix>
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struct confix_gen
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{
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template<typename Subject>
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constexpr confix_directive<
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Prefix, typename extension::as_parser<Subject>::value_type, Postfix>
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operator[](Subject const& subject) const
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{
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return { prefix, as_parser(subject), postfix };
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}
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Prefix prefix;
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Postfix postfix;
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};
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template<typename Prefix, typename Postfix>
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constexpr confix_gen<typename extension::as_parser<Prefix>::value_type,
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typename extension::as_parser<Postfix>::value_type>
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confix(Prefix const& prefix, Postfix const& postfix)
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{
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return { as_parser(prefix), as_parser(postfix) };
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}
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}}}
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#endif
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