Chris@102: /*=============================================================================
Chris@102:     Copyright (c) 2001-2014 Joel de Guzman
Chris@102: 
Chris@102:     Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@102:     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@102: ==============================================================================*/
Chris@102: #if !defined(BOOST_SPIRIT_X3_EPS_MARCH_23_2007_0454PM)
Chris@102: #define BOOST_SPIRIT_X3_EPS_MARCH_23_2007_0454PM
Chris@102: 
Chris@102: #if defined(_MSC_VER)
Chris@102: #pragma once
Chris@102: #endif
Chris@102: 
Chris@102: #include <boost/spirit/home/x3/core/skip_over.hpp>
Chris@102: #include <boost/spirit/home/x3/core/parser.hpp>
Chris@102: #include <boost/spirit/home/x3/support/unused.hpp>
Chris@102: 
Chris@102: namespace boost { namespace spirit { namespace x3
Chris@102: {
Chris@102:     struct rule_context_tag;
Chris@102: 
Chris@102:     struct semantic_predicate : parser<semantic_predicate>
Chris@102:     {
Chris@102:         typedef unused_type attribute_type;
Chris@102:         static bool const has_attribute = false;
Chris@102: 
Chris@102:         semantic_predicate(bool predicate)
Chris@102:           : predicate(predicate) {}
Chris@102: 
Chris@102:         template <typename Iterator, typename Context, typename Attribute>
Chris@102:         bool parse(Iterator& first, Iterator const& last
Chris@102:           , Context const& context, unused_type, Attribute&) const
Chris@102:         {
Chris@102:             x3::skip_over(first, last, context);
Chris@102:             return predicate;
Chris@102:         }
Chris@102: 
Chris@102:         bool predicate;
Chris@102:     };
Chris@102: 
Chris@102:     template <typename F>
Chris@102:     struct lazy_semantic_predicate : parser<lazy_semantic_predicate<F>>
Chris@102:     {
Chris@102:         typedef unused_type attribute_type;
Chris@102:         static bool const has_attribute = false;
Chris@102: 
Chris@102:         lazy_semantic_predicate(F f)
Chris@102:           : f(f) {}
Chris@102: 
Chris@102:         template <typename Iterator, typename Context, typename Attribute>
Chris@102:         bool parse(Iterator& first, Iterator const& last
Chris@102:           , Context const& context, unused_type, Attribute& attr) const
Chris@102:         {
Chris@102:             x3::skip_over(first, last, context);
Chris@102:             return f(x3::get<rule_context_tag>(context));
Chris@102:         }
Chris@102: 
Chris@102:         F f;
Chris@102:     };
Chris@102: 
Chris@102:     struct eps_parser : parser<eps_parser>
Chris@102:     {
Chris@102:         typedef unused_type attribute_type;
Chris@102:         static bool const has_attribute = false;
Chris@102: 
Chris@102:         template <typename Iterator, typename Context
Chris@102:           , typename RuleContext, typename Attribute>
Chris@102:         bool parse(Iterator& first, Iterator const& last
Chris@102:           , Context const& context, RuleContext&, Attribute&) const
Chris@102:         {
Chris@102:             x3::skip_over(first, last, context);
Chris@102:             return true;
Chris@102:         }
Chris@102: 
Chris@102:         semantic_predicate
Chris@102:         operator()(bool predicate) const
Chris@102:         {
Chris@102:             return semantic_predicate(predicate);
Chris@102:         }
Chris@102: 
Chris@102:         template <typename F>
Chris@102:         lazy_semantic_predicate<F>
Chris@102:         operator()(F f) const
Chris@102:         {
Chris@102:             return lazy_semantic_predicate<F>(f);
Chris@102:         }
Chris@102:     };
Chris@102: 
Chris@102:     eps_parser const eps = eps_parser();
Chris@102: }}}
Chris@102: 
Chris@102: #endif