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/*=============================================================================
Copyright (c) 2001-2011 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_FUNCTION_APR_29_2007_0558PM)
#define SPIRIT_EXPECT_FUNCTION_APR_29_2007_0558PM
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/spirit/home/support/unused.hpp>
#include <boost/spirit/home/support/multi_pass_wrapper.hpp>
#include <boost/throw_exception.hpp>
namespace boost { namespace spirit { namespace qi { namespace detail
{
template <
typename Iterator, typename Context
, typename Skipper, typename Exception>
struct expect_function
{
typedef Iterator iterator_type;
typedef Context context_type;
expect_function(
Iterator& first, Iterator const& last
, Context& context, Skipper const& skipper)
: first(first)
, last(last)
, context(context)
, skipper(skipper)
, is_first(true)
{
}
template <typename Component, typename Attribute>
bool operator()(Component const& component, Attribute& attr) const
{
// if this is not the first component in the expect chain we
// need to flush any multi_pass iterator we might be acting on
if (!is_first)
spirit::traits::clear_queue(first);
// if we are testing the first component in the sequence,
// return true if the parser fails, if this is not the first
// component, throw exception if the parser fails
if (!component.parse(first, last, context, skipper, attr))
{
if (is_first)
{
is_first = false;
return true; // true means the match failed
}
boost::throw_exception(Exception(first, last, component.what(context)));
#if defined(BOOST_NO_EXCEPTIONS)
return true; // for systems not supporting exceptions
#endif
}
is_first = false;
return false;
}
template <typename Component>
bool operator()(Component const& component) const
{
// if this is not the first component in the expect chain we
// need to flush any multi_pass iterator we might be acting on
if (!is_first)
spirit::traits::clear_queue(first);
// if we are testing the first component in the sequence,
// return true if the parser fails, if this not the first
// component, throw exception if the parser fails
if (!component.parse(first, last, context, skipper, unused))
{
if (is_first)
{
is_first = false;
return true;
}
boost::throw_exception(Exception(first, last, component.what(context)));
#if defined(BOOST_NO_EXCEPTIONS)
return false; // for systems not supporting exceptions
#endif
}
is_first = false;
return false;
}
Iterator& first;
Iterator const& last;
Context& context;
Skipper const& skipper;
mutable bool is_first;
private:
// silence MSVC warning C4512: assignment operator could not be generated
expect_function& operator= (expect_function const&);
};
}}}}
#endif
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