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(SPIRIT_EXPECT_MARCH_16_2012_1024PM)
Chris@102: #define SPIRIT_EXPECT_MARCH_16_2012_1024PM
Chris@102: 
Chris@102: #if defined(_MSC_VER)
Chris@102: #pragma once
Chris@102: #endif
Chris@102: 
Chris@102: #include <boost/spirit/home/x3/support/context.hpp>
Chris@102: #include <boost/spirit/home/x3/core/parser.hpp>
Chris@102: #include <boost/throw_exception.hpp>
Chris@102: #include <stdexcept>
Chris@102: 
Chris@102: namespace boost { namespace spirit { namespace x3
Chris@102: {
Chris@102:     template <typename Iterator>
Chris@102:     struct expectation_failure : std::runtime_error
Chris@102:     {
Chris@102:     public:
Chris@102: 
Chris@102:         expectation_failure(Iterator where, std::string const& which)
Chris@102:           : std::runtime_error("boost::spirit::x3::expectation_failure")
Chris@102:           , where_(where), which_(which)
Chris@102:         {}
Chris@102:         ~expectation_failure() throw() {}
Chris@102:         
Chris@102:         std::string which() const { return which_; }
Chris@102:         Iterator const& where() const { return where_; }
Chris@102:         
Chris@102:     private:
Chris@102: 
Chris@102:         Iterator where_;
Chris@102:         std::string which_;
Chris@102:     };
Chris@102: 
Chris@102:     template <typename Subject>
Chris@102:     struct expect_directive : unary_parser<Subject, expect_directive<Subject>>
Chris@102:     {
Chris@102:         typedef unary_parser<Subject, expect_directive<Subject> > base_type;
Chris@102:         static bool const is_pass_through_unary = true;
Chris@102: 
Chris@102:         expect_directive(Subject const& subject)
Chris@102:           : base_type(subject) {}
Chris@102: 
Chris@102:         template <typename Iterator, typename Context
Chris@102:           , typename RContext, typename Attribute>
Chris@102:         bool parse(Iterator& first, Iterator const& last
Chris@102:           , Context const& context, RContext& rcontext, Attribute& attr) const
Chris@102:         {
Chris@102:             bool r = this->subject.parse(first, last, context, rcontext, attr);
Chris@102: 
Chris@102:             if (!r)
Chris@102:             {
Chris@102:                 boost::throw_exception(
Chris@102:                     expectation_failure<Iterator>(
Chris@102:                         first, what(this->subject)));
Chris@102:             }
Chris@102:             return r;
Chris@102:         }
Chris@102:     };
Chris@102: 
Chris@102:     struct expect_gen
Chris@102:     {
Chris@102:         template <typename Subject>
Chris@102:         expect_directive<typename extension::as_parser<Subject>::value_type>
Chris@102:         operator[](Subject const& subject) const
Chris@102:         {
Chris@102:             return {as_parser(subject)};
Chris@102:         }
Chris@102:     };
Chris@102: 
Chris@102:     expect_gen const expect = expect_gen();
Chris@102: }}}
Chris@102: 
Chris@102: #endif