add boost on mac
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189
macx64/include/boost/spirit/home/classic/dynamic/while.hpp
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189
macx64/include/boost/spirit/home/classic/dynamic/while.hpp
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/*=============================================================================
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Copyright (c) 2002-2003 Joel de Guzman
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Copyright (c) 2002-2003 Martin Wille
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http://spirit.sourceforge.net/
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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_WHILE_HPP
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#define BOOST_SPIRIT_WHILE_HPP
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#include <boost/spirit/home/classic/namespace.hpp>
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#include <boost/spirit/home/classic/core/parser.hpp>
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#include <boost/spirit/home/classic/core/composite/composite.hpp>
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#include <boost/spirit/home/classic/dynamic/impl/conditions.ipp>
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////////////////////////////////////////////////////////////////////////////////
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namespace boost { namespace spirit {
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BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
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namespace impl {
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//////////////////////////////////
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// while parser
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// object are created by while_parser_gen and do_parser_gen
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template <typename ParsableT, typename CondT, bool is_do_parser>
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struct while_parser
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: public condition_evaluator< typename as_parser<CondT>::type >
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, public unary // the parent stores a copy of the body parser
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<
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typename as_parser<ParsableT>::type,
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parser<while_parser<ParsableT, CondT, is_do_parser> >
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>
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{
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typedef while_parser<ParsableT, CondT, is_do_parser> self_t;
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typedef as_parser<ParsableT> as_parser_t;
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typedef typename as_parser_t::type parser_t;
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typedef as_parser<CondT> cond_as_parser_t;
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typedef typename cond_as_parser_t::type condition_t;
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typedef unary<parser_t, parser<self_t> > base_t;
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typedef condition_evaluator<condition_t> eval_t;
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//////////////////////////////
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// constructor, saves condition and body parser
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while_parser(ParsableT const &body, CondT const &cond)
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: eval_t(cond_as_parser_t::convert(cond))
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, base_t(as_parser_t::convert(body))
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{}
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//////////////////////////////
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// result type computer.
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template <typename ScannerT>
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struct result
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{
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typedef typename match_result
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<ScannerT, nil_t>::type type;
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};
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//////////////////////////////
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// parse member function
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template <typename ScannerT>
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typename parser_result<self_t, ScannerT>::type
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parse(ScannerT const& scan) const
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{
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typedef typename parser_result<parser_t, ScannerT>::type sresult_t;
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typedef typename ScannerT::iterator_t iterator_t;
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iterator_t save(scan.first);
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std::size_t length = 0;
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std::ptrdiff_t eval_length = 0;
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bool dont_check_condition = is_do_parser;
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while (dont_check_condition || (eval_length=this->evaluate(scan))>=0)
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{
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dont_check_condition = false;
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length += eval_length;
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sresult_t tmp(this->subject().parse(scan));
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if (tmp)
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{
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length+=tmp.length();
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}
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else
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{
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return scan.no_match();
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}
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}
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return scan.create_match(length, nil_t(), save, scan.first);
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}
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};
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//////////////////////////////////
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// while-parser generator, takes the body-parser in brackets
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// and returns the actual while-parser.
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template <typename CondT>
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struct while_parser_gen
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{
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//////////////////////////////
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// constructor, saves the condition for use by operator[]
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while_parser_gen(CondT const& cond_) : cond(cond_) {}
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//////////////////////////////
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// operator[] returns the actual while-parser object
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template <typename ParsableT>
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while_parser<ParsableT, CondT, false>
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operator[](ParsableT const &subject) const
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{
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return while_parser<ParsableT, CondT, false>(subject, cond);
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}
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private:
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//////////////////////////////
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// the condition is stored by reference here.
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// this should not cause any harm since object of type
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// while_parser_gen<> are only used as temporaries
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// the while-parser object constructed by the operator[]
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// stores a copy of the condition.
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CondT const &cond;
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};
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//////////////////////////////////
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// do-while-parser generator, takes the condition as
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// parameter to while_p member function and returns the
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// actual do-while-parser.
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template <typename ParsableT>
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struct do_while_parser_gen
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{
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//////////////////////////////
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// constructor. saves the body parser for use by while_p.
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explicit do_while_parser_gen(ParsableT const &body_parser)
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: body(body_parser)
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{}
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//////////////////////////////
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// while_p returns the actual while-parser object
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template <typename CondT>
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while_parser<ParsableT, CondT, true>
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while_p(CondT cond) const
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{
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return while_parser<ParsableT, CondT, true>(body, cond);
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}
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private:
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//////////////////////////////
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// the body is stored by reference here
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// this should not cause any harm since object of type
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// do_while_parser_gen<> are only used as temporaries
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// the while-parser object constructed by the while_p
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// member function stores a copy of the body parser.
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ParsableT const &body;
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};
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struct do_parser_gen
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{
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inline do_parser_gen() {}
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template <typename ParsableT>
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impl::do_while_parser_gen<ParsableT>
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operator[](ParsableT const& body) const
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{
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return impl::do_while_parser_gen<ParsableT>(body);
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}
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};
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} // namespace impl
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//////////////////////////////////
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// while_p function, while-parser generator
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// Usage: spirit::while_p(Condition)[Body]
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template <typename CondT>
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impl::while_parser_gen<CondT>
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while_p(CondT const& cond)
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{
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return impl::while_parser_gen<CondT>(cond);
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}
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//////////////////////////////////
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// do_p functor, do-while-parser generator
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// Usage: spirit::do_p[Body].while_p(Condition)
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impl::do_parser_gen const do_p = impl::do_parser_gen();
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BOOST_SPIRIT_CLASSIC_NAMESPACE_END
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}} // namespace BOOST_SPIRIT_CLASSIC_NS
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#endif // BOOST_SPIRIT_WHILE_HPP
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