ceph/src/boost/boost/regex/v4/regex_iterator.hpp

   1 /*
   2  *
   3  * Copyright (c) 2003
   4  * John Maddock
   5  *
   6  * Use, modification and distribution are subject to the
   7  * Boost Software License, Version 1.0. (See accompanying file
   8  * LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9  *
  10  */
  11
  12  /*
  13   *   LOCATION:    see http://www.boost.org for most recent version.
  14   *   FILE         regex_iterator.hpp
  15   *   VERSION      see <boost/version.hpp>
  16   *   DESCRIPTION: Provides regex_iterator implementation.
  17   */
  18
  19 #ifndef BOOST_REGEX_V4_REGEX_ITERATOR_HPP
  20 #define BOOST_REGEX_V4_REGEX_ITERATOR_HPP
  21
  22 #include <boost/shared_ptr.hpp>
  23
  24 namespace boost{
  25
  26 #ifdef BOOST_MSVC
  27 #pragma warning(push)
  28 #pragma warning(disable: 4103)
  29 #endif
  30 #ifdef BOOST_HAS_ABI_HEADERS
  31 #  include BOOST_ABI_PREFIX
  32 #endif
  33 #ifdef BOOST_MSVC
  34 #pragma warning(pop)
  35 #endif
  36
  37 template <class BidirectionalIterator,
  38           class charT,
  39           class traits>
  40 class regex_iterator_implementation
  41 {
  42    typedef basic_regex<charT, traits> regex_type;
  43
  44    match_results<BidirectionalIterator> what;  // current match
  45    BidirectionalIterator                base;  // start of sequence
  46    BidirectionalIterator                end;   // end of sequence
  47    const regex_type                     re;   // the expression
  48    match_flag_type                      flags; // flags for matching
  49
  50 public:
  51    regex_iterator_implementation(const regex_type* p, BidirectionalIterator last, match_flag_type f)
  52       : base(), end(last), re(*p), flags(f){}
  53    regex_iterator_implementation(const regex_iterator_implementation& other)
  54       :what(other.what), base(other.base), end(other.end), re(other.re), flags(other.flags){}
  55    bool init(BidirectionalIterator first)
  56    {
  57       base = first;
  58       return regex_search(first, end, what, re, flags);
  59    }
  60    bool compare(const regex_iterator_implementation& that)
  61    {
  62       if(this == &that) return true;
  63       return (&re.get_data() == &that.re.get_data()) && (end == that.end) && (flags == that.flags) && (what[0].first == that.what[0].first) && (what[0].second == that.what[0].second);
  64    }
  65    const match_results<BidirectionalIterator>& get()
  66    { return what; }
  67    bool next()
  68    {
  69       //if(what.prefix().first != what[0].second)
  70       //   flags |= match_prev_avail;
  71       BidirectionalIterator next_start = what[0].second;
  72       match_flag_type f(flags);
  73       if(!what.length() || (f & regex_constants::match_posix))
  74          f |= regex_constants::match_not_initial_null;
  75       //if(base != next_start)
  76       //   f |= regex_constants::match_not_bob;
  77       bool result = regex_search(next_start, end, what, re, f, base);
  78       if(result)
  79          what.set_base(base);
  80       return result;
  81    }
  82 private:
  83    regex_iterator_implementation& operator=(const regex_iterator_implementation&);
  84 };
  85
  86 template <class BidirectionalIterator,
  87           class charT = BOOST_DEDUCED_TYPENAME BOOST_REGEX_DETAIL_NS::regex_iterator_traits<BidirectionalIterator>::value_type,
  88           class traits = regex_traits<charT> >
  89 class regex_iterator
  90 {
  91 private:
  92    typedef regex_iterator_implementation<BidirectionalIterator, charT, traits> impl;
  93    typedef shared_ptr<impl> pimpl;
  94 public:
  95    typedef          basic_regex<charT, traits>                   regex_type;
  96    typedef          match_results<BidirectionalIterator>                    value_type;
  97    typedef typename BOOST_REGEX_DETAIL_NS::regex_iterator_traits<BidirectionalIterator>::difference_type
  98                                                                             difference_type;
  99    typedef          const value_type*                                       pointer;
 100    typedef          const value_type&                                       reference;
 101    typedef          std::forward_iterator_tag                               iterator_category;
 102
 103    regex_iterator(){}
 104    regex_iterator(BidirectionalIterator a, BidirectionalIterator b,
 105                   const regex_type& re,
 106                   match_flag_type m = match_default)
 107                   : pdata(new impl(&re, b, m))
 108    {
 109       if(!pdata->init(a))
 110       {
 111          pdata.reset();
 112       }
 113    }
 114    regex_iterator(const regex_iterator& that)
 115       : pdata(that.pdata) {}
 116    regex_iterator& operator=(const regex_iterator& that)
 117    {
 118       pdata = that.pdata;
 119       return *this;
 120    }
 121    bool operator==(const regex_iterator& that)const
 122    {
 123       if((pdata.get() == 0) || (that.pdata.get() == 0))
 124          return pdata.get() == that.pdata.get();
 125       return pdata->compare(*(that.pdata.get()));
 126    }
 127    bool operator!=(const regex_iterator& that)const
 128    { return !(*this == that); }
 129    const value_type& operator*()const
 130    { return pdata->get(); }
 131    const value_type* operator->()const
 132    { return &(pdata->get()); }
 133    regex_iterator& operator++()
 134    {
 135       cow();
 136       if(0 == pdata->next())
 137       {
 138          pdata.reset();
 139       }
 140       return *this;
 141    }
 142    regex_iterator operator++(int)
 143    {
 144       regex_iterator result(*this);
 145       ++(*this);
 146       return result;
 147    }
 148 private:
 149
 150    pimpl pdata;
 151
 152    void cow()
 153    {
 154       // copy-on-write
 155       if(pdata.get() && !pdata.unique())
 156       {
 157          pdata.reset(new impl(*(pdata.get())));
 158       }
 159    }
 160 };
 161
 162 typedef regex_iterator<const char*> cregex_iterator;
 163 typedef regex_iterator<std::string::const_iterator> sregex_iterator;
 164 #ifndef BOOST_NO_WREGEX
 165 typedef regex_iterator<const wchar_t*> wcregex_iterator;
 166 typedef regex_iterator<std::wstring::const_iterator> wsregex_iterator;
 167 #endif
 168
 169 // make_regex_iterator:
 170 template <class charT, class traits>
 171 inline regex_iterator<const charT*, charT, traits> make_regex_iterator(const charT* p, const basic_regex<charT, traits>& e, regex_constants::match_flag_type m = regex_constants::match_default)
 172 {
 173    return regex_iterator<const charT*, charT, traits>(p, p+traits::length(p), e, m);
 174 }
 175 template <class charT, class traits, class ST, class SA>
 176 inline regex_iterator<typename std::basic_string<charT, ST, SA>::const_iterator, charT, traits> make_regex_iterator(const std::basic_string<charT, ST, SA>& p, const basic_regex<charT, traits>& e, regex_constants::match_flag_type m = regex_constants::match_default)
 177 {
 178    return regex_iterator<typename std::basic_string<charT, ST, SA>::const_iterator, charT, traits>(p.begin(), p.end(), e, m);
 179 }
 180
 181 #ifdef BOOST_MSVC
 182 #pragma warning(push)
 183 #pragma warning(disable: 4103)
 184 #endif
 185 #ifdef BOOST_HAS_ABI_HEADERS
 186 #  include BOOST_ABI_SUFFIX
 187 #endif
 188 #ifdef BOOST_MSVC
 189 #pragma warning(pop)
 190 #endif
 191
 192 } // namespace boost
 193
 194 #endif // BOOST_REGEX_V4_REGEX_ITERATOR_HPP
 195