projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
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 | ||
| 19 | namespace boost { namespace spirit { | |
| 20 | ||
| 21 | BOOST_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 | ||
| 136 | BOOST_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> |