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/*=============================================================================
Copyright (c) 2001-2014 Joel de Guzman
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(SPIRIT_EXPECT_MARCH_16_2012_1024PM)
#define SPIRIT_EXPECT_MARCH_16_2012_1024PM
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/spirit/home/x3/support/context.hpp>
#include <boost/spirit/home/x3/core/parser.hpp>
#include <boost/throw_exception.hpp>
#include <stdexcept>
namespace boost { namespace spirit { namespace x3
{
template <typename Iterator>
struct expectation_failure : std::runtime_error
{
public:
expectation_failure(Iterator where, std::string const& which)
: std::runtime_error("boost::spirit::x3::expectation_failure")
, where_(where), which_(which)
{}
~expectation_failure() throw() {}
std::string which() const { return which_; }
Iterator const& where() const { return where_; }
private:
Iterator where_;
std::string which_;
};
template <typename Subject>
struct expect_directive : unary_parser<Subject, expect_directive<Subject>>
{
typedef unary_parser<Subject, expect_directive<Subject> > base_type;
static bool const is_pass_through_unary = true;
expect_directive(Subject const& subject)
: base_type(subject) {}
template <typename Iterator, typename Context
, typename RContext, typename Attribute>
bool parse(Iterator& first, Iterator const& last
, Context const& context, RContext& rcontext, Attribute& attr) const
{
bool r = this->subject.parse(first, last, context, rcontext, attr);
if (!r)
{
boost::throw_exception(
expectation_failure<Iterator>(
first, what(this->subject)));
}
return r;
}
};
struct expect_gen
{
template <typename Subject>
expect_directive<typename extension::as_parser<Subject>::value_type>
operator[](Subject const& subject) const
{
return {as_parser(subject)};
}
};
expect_gen const expect = expect_gen();
}}}
#endif
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