///////////////////////////////////////////////////////////////////////////////
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// flow_control.hpp
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//
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// Copyright 2008 Eric Niebler. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_XPRESSIVE_DETAIL_CORE_FLOW_CONTROL_HPP_EAN_10_04_2005
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#define BOOST_XPRESSIVE_DETAIL_CORE_FLOW_CONTROL_HPP_EAN_10_04_2005
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// MS compatible compilers support #pragma once
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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/xpressive/detail/detail_fwd.hpp>
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#include <boost/xpressive/detail/core/regex_impl.hpp>
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#include <boost/xpressive/detail/core/state.hpp>
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#include <boost/xpressive/detail/utility/ignore_unused.hpp>
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namespace boost { namespace xpressive { namespace detail
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{
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///////////////////////////////////////////////////////////////////////////////
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// push_context_match
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//
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template<typename BidiIter>
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inline bool push_context_match
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(
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regex_impl<BidiIter> const &impl
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, match_state<BidiIter> &state
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, matchable<BidiIter> const &next
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)
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{
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// avoid infinite recursion
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// BUGBUG this only catches direct infinite recursion, like sregex::compile("(?R)"), but
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// not indirect infinite recursion where two rules invoke each other recursively.
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if(state.is_active_regex(impl) && state.cur_ == state.sub_match(0).begin_)
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{
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return next.match(state);
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}
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// save state
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match_context<BidiIter> context = state.push_context(impl, next, context);
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detail::ignore_unused(context);
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// match the nested regex and uninitialize the match context
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// (reclaims the sub_match objects if necessary)
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return state.pop_context(impl, impl.xpr_->match(state));
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}
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///////////////////////////////////////////////////////////////////////////////
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// pop_context_match
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//
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template<typename BidiIter>
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inline bool pop_context_match(match_state<BidiIter> &state)
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{
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// save state
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// BUGBUG nested regex could have changed state.traits_
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match_context<BidiIter> &context(*state.context_.prev_context_);
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state.swap_context(context);
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// Finished matching the nested regex; now match the rest of the enclosing regex
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bool success = context.next_ptr_->match(state);
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// restore state
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state.swap_context(context);
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return success;
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}
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}}} // namespace boost::xpressive::detail
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#endif
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