// Copyright (c) 2001-2011 Hartmut Kaiser
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//
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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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#if !defined(BOOST_SPIRIT_ITERATOR_SPLIT_FUNCTOR_INPUT_POLICY_JAN_16_2008_0448M)
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#define BOOST_SPIRIT_ITERATOR_SPLIT_FUNCTOR_INPUT_POLICY_JAN_16_2008_0448M
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#include <boost/spirit/home/support/iterators/multi_pass_fwd.hpp>
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#include <boost/spirit/home/support/iterators/detail/multi_pass.hpp>
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#include <boost/assert.hpp>
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namespace boost { namespace spirit { namespace iterator_policies
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{
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namespace is_valid_test_
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{
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template <typename Token>
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inline bool token_is_valid(Token const&)
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{
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return true;
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}
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}
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///////////////////////////////////////////////////////////////////////////
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// class functor_input
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// Implementation of the InputPolicy used by multi_pass
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// functor_input gets tokens from a functor
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//
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// Note: the functor must have a typedef for result_type
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// It also must have a static variable of type result_type defined
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// to represent EOF that is called eof.
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//
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///////////////////////////////////////////////////////////////////////////
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struct functor_input
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{
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///////////////////////////////////////////////////////////////////////
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template <typename Functor>
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class unique : public detail::default_input_policy
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{
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private:
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typedef typename Functor::result_type result_type;
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protected:
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unique() {}
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explicit unique(Functor const& x) : ftor(x) {}
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void swap(unique& x)
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{
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boost::swap(ftor, x.ftor);
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}
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public:
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typedef result_type value_type;
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typedef std::ptrdiff_t difference_type;
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typedef std::ptrdiff_t distance_type;
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typedef result_type* pointer;
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typedef result_type& reference;
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public:
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// get the next token
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template <typename MultiPass>
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static typename MultiPass::reference get_input(MultiPass& mp)
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{
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value_type& curtok = mp.shared()->curtok;
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if (!input_is_valid(mp, curtok))
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curtok = mp.ftor();
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return curtok;
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}
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template <typename MultiPass>
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static void advance_input(MultiPass& mp)
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{
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// if mp.shared is NULL then this instance of the multi_pass
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// represents a end iterator
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BOOST_ASSERT(0 != mp.shared());
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mp.shared()->curtok = mp.ftor();
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}
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// test, whether we reached the end of the underlying stream
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template <typename MultiPass>
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static bool input_at_eof(MultiPass const& mp)
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{
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return mp.shared()->curtok == mp.ftor.eof;
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}
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template <typename MultiPass>
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static bool input_is_valid(MultiPass const&, value_type const& t)
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{
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using namespace is_valid_test_;
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return token_is_valid(t);
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}
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Functor& get_functor() const
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{
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return ftor;
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}
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protected:
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mutable Functor ftor;
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};
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///////////////////////////////////////////////////////////////////////
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template <typename Functor>
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struct shared
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{
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explicit shared(Functor const&) : curtok(0) {}
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typename Functor::result_type curtok;
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};
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};
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}}}
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#endif
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