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