3rdparty/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    bool init(BidirectionalIterator first)
  54    {
  55       base = first;
  56       return regex_search(first, end, what, re, flags);
  57    }
  58    bool compare(const regex_iterator_implementation& that)
  59    {
  60       if(this == &that) return true;
  61       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);
  62    }
  63    const match_results<BidirectionalIterator>& get()
  64    { return what; }
  65    bool next()
  66    {
  67       //if(what.prefix().first != what[0].second)
  68       //   flags |= match_prev_avail;
  69       BidirectionalIterator next_start = what[0].second;
  70       match_flag_type f(flags);
  71       if(!what.length() || (f & regex_constants::match_posix))
  72          f |= regex_constants::match_not_initial_null;
  73       //if(base != next_start)
  74       //   f |= regex_constants::match_not_bob;
  75       bool result = regex_search(next_start, end, what, re, f, base);
  76       if(result)
  77          what.set_base(base);
  78       return result;
  79    }
  80 private:
  81    regex_iterator_implementation& operator=(const regex_iterator_implementation&);
  82 };
  83
  84 template <class BidirectionalIterator,
  85           class charT = BOOST_DEDUCED_TYPENAME BOOST_REGEX_DETAIL_NS::regex_iterator_traits<BidirectionalIterator>::value_type,
  86           class traits = regex_traits<charT> >
  87 class regex_iterator
  88 {
  89 private:
  90    typedef regex_iterator_implementation<BidirectionalIterator, charT, traits> impl;
  91    typedef shared_ptr<impl> pimpl;
  92 public:
  93    typedef          basic_regex<charT, traits>                   regex_type;
  94    typedef          match_results<BidirectionalIterator>                    value_type;
  95    typedef typename BOOST_REGEX_DETAIL_NS::regex_iterator_traits<BidirectionalIterator>::difference_type
  96                                                                             difference_type;
  97    typedef          const value_type*                                       pointer;
  98    typedef          const value_type&                                       reference;
  99    typedef          std::forward_iterator_tag                               iterator_category;
 100
 101    regex_iterator(){}
 102    regex_iterator(BidirectionalIterator a, BidirectionalIterator b,
 103                   const regex_type& re,
 104                   match_flag_type m = match_default)
 105                   : pdata(new impl(&re, b, m))
 106    {
 107       if(!pdata->init(a))
 108       {
 109          pdata.reset();
 110       }
 111    }
 112    regex_iterator(const regex_iterator& that)
 113       : pdata(that.pdata) {}
 114    regex_iterator& operator=(const regex_iterator& that)
 115    {
 116       pdata = that.pdata;
 117       return *this;
 118    }
 119    bool operator==(const regex_iterator& that)const
 120    {
 121       if((pdata.get() == 0) || (that.pdata.get() == 0))
 122          return pdata.get() == that.pdata.get();
 123       return pdata->compare(*(that.pdata.get()));
 124    }
 125    bool operator!=(const regex_iterator& that)const
 126    { return !(*this == that); }
 127    const value_type& operator*()const
 128    { return pdata->get(); }
 129    const value_type* operator->()const
 130    { return &(pdata->get()); }
 131    regex_iterator& operator++()
 132    {
 133       cow();
 134       if(0 == pdata->next())
 135       {
 136          pdata.reset();
 137       }
 138       return *this;
 139    }
 140    regex_iterator operator++(int)
 141    {
 142       regex_iterator result(*this);
 143       ++(*this);
 144       return result;
 145    }
 146 private:
 147
 148    pimpl pdata;
 149
 150    void cow()
 151    {
 152       // copy-on-write
 153       if(pdata.get() && !pdata.unique())
 154       {
 155          pdata.reset(new impl(*(pdata.get())));
 156       }
 157    }
 158 };
 159
 160 typedef regex_iterator<const char*> cregex_iterator;
 161 typedef regex_iterator<std::string::const_iterator> sregex_iterator;
 162 #ifndef BOOST_NO_WREGEX
 163 typedef regex_iterator<const wchar_t*> wcregex_iterator;
 164 typedef regex_iterator<std::wstring::const_iterator> wsregex_iterator;
 165 #endif
 166
 167 // make_regex_iterator:
 168 template <class charT, class traits>
 169 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)
 170 {
 171    return regex_iterator<const charT*, charT, traits>(p, p+traits::length(p), e, m);
 172 }
 173 template <class charT, class traits, class ST, class SA>
 174 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)
 175 {
 176    return regex_iterator<typename std::basic_string<charT, ST, SA>::const_iterator, charT, traits>(p.begin(), p.end(), e, m);
 177 }
 178
 179 #ifdef BOOST_MSVC
 180 #pragma warning(push)
 181 #pragma warning(disable: 4103)
 182 #endif
 183 #ifdef BOOST_HAS_ABI_HEADERS
 184 #  include BOOST_ABI_SUFFIX
 185 #endif
 186 #ifdef BOOST_MSVC
 187 #pragma warning(pop)
 188 #endif
 189
 190 } // namespace boost
 191
 192 #endif // BOOST_REGEX_V4_REGEX_ITERATOR_HPP
 193