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/Src/Dependencies/Boost/boost/spirit/home/classic/core/composite/exclusive_or.hpp

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C++ Header | 142 lines | 94 code | 25 blank | 23 comment | 2 complexity | dddef440f3e4600b01ea5ce23c2a0dcb MD5 | raw file
  1/*=============================================================================
  2    Copyright (c) 1998-2003 Joel de Guzman
  3    Copyright (c) 2001 Daniel Nuffer
  4    Copyright (c) 2002 Hartmut Kaiser
  5    http://spirit.sourceforge.net/
  6
  7  Distributed under the Boost Software License, Version 1.0. (See accompanying
  8  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  9=============================================================================*/
 10#if !defined(BOOST_SPIRIT_EXCLUSIVE_OR_HPP)
 11#define BOOST_SPIRIT_EXCLUSIVE_OR_HPP
 12
 13#include <boost/spirit/home/classic/namespace.hpp>
 14#include <boost/spirit/home/classic/core/parser.hpp>
 15#include <boost/spirit/home/classic/core/primitives/primitives.hpp>
 16#include <boost/spirit/home/classic/core/composite/composite.hpp>
 17#include <boost/spirit/home/classic/meta/as_parser.hpp>
 18
 19namespace boost { namespace spirit {
 20
 21BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
 22
 23    ///////////////////////////////////////////////////////////////////////////
 24    //
 25    //  exclusive_or class
 26    //
 27    //      Handles expressions of the form:
 28    //
 29    //          a ^ b
 30    //
 31    //      where a and b are parsers. The expression returns a composite
 32    //      parser that matches a or b but not both. One (not both) of the
 33    //      operands may be a literal char, wchar_t or a primitive string
 34    //      char const*, wchar_t const*.
 35    //
 36    ///////////////////////////////////////////////////////////////////////////
 37    struct exclusive_or_parser_gen;
 38
 39    template <typename A, typename B>
 40    struct exclusive_or
 41    :   public binary<A, B, parser<exclusive_or<A, B> > >
 42    {
 43        typedef exclusive_or<A, B>              self_t;
 44        typedef binary_parser_category          parser_category_t;
 45        typedef exclusive_or_parser_gen         parser_generator_t;
 46        typedef binary<A, B, parser<self_t> >   base_t;
 47
 48        exclusive_or(A const& a, B const& b)
 49        : base_t(a, b) {}
 50
 51        template <typename ScannerT>
 52        typename parser_result<self_t, ScannerT>::type
 53        parse(ScannerT const& scan) const
 54        {
 55            typedef typename parser_result<self_t, ScannerT>::type result_t;
 56            typedef typename ScannerT::iterator_t iterator_t;
 57
 58            iterator_t save = scan.first;
 59            result_t l = this->left().parse(scan);
 60            std::swap(save, scan.first);
 61            result_t r = this->right().parse(scan);
 62
 63            if (l ? !bool(r) : bool(r))
 64            {
 65                if (l)
 66                    scan.first = save;
 67                return l ? l : r;
 68            }
 69
 70            return scan.no_match();
 71        }
 72    };
 73
 74    struct exclusive_or_parser_gen
 75    {
 76        template <typename A, typename B>
 77        struct result
 78        {
 79            typedef
 80                exclusive_or<
 81                    typename as_parser<A>::type
 82                  , typename as_parser<B>::type
 83                >
 84            type;
 85        };
 86
 87        template <typename A, typename B>
 88        static exclusive_or<
 89            typename as_parser<A>::type
 90          , typename as_parser<B>::type
 91        >
 92        generate(A const& a, B const& b)
 93        {
 94            return exclusive_or<BOOST_DEDUCED_TYPENAME as_parser<A>::type,
 95                BOOST_DEDUCED_TYPENAME as_parser<B>::type>
 96                    (as_parser<A>::convert(a), as_parser<B>::convert(b));
 97        }
 98    };
 99
100    template <typename A, typename B>
101    exclusive_or<A, B>
102    operator^(parser<A> const& a, parser<B> const& b);
103
104    template <typename A>
105    exclusive_or<A, chlit<char> >
106    operator^(parser<A> const& a, char b);
107
108    template <typename B>
109    exclusive_or<chlit<char>, B>
110    operator^(char a, parser<B> const& b);
111
112    template <typename A>
113    exclusive_or<A, strlit<char const*> >
114    operator^(parser<A> const& a, char const* b);
115
116    template <typename B>
117    exclusive_or<strlit<char const*>, B>
118    operator^(char const* a, parser<B> const& b);
119
120    template <typename A>
121    exclusive_or<A, chlit<wchar_t> >
122    operator^(parser<A> const& a, wchar_t b);
123
124    template <typename B>
125    exclusive_or<chlit<wchar_t>, B>
126    operator^(wchar_t a, parser<B> const& b);
127
128    template <typename A>
129    exclusive_or<A, strlit<wchar_t const*> >
130    operator^(parser<A> const& a, wchar_t const* b);
131
132    template <typename B>
133    exclusive_or<strlit<wchar_t const*>, B>
134    operator^(wchar_t const* a, parser<B> const& b);
135
136BOOST_SPIRIT_CLASSIC_NAMESPACE_END
137
138}} // namespace BOOST_SPIRIT_CLASSIC_NS
139
140#endif
141
142#include <boost/spirit/home/classic/core/composite/impl/exclusive_or.ipp>