3rdparty/boost/boost/regex/v4/u32regex_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         u32regex_iterator.hpp
  15   *   VERSION      see <boost/version.hpp>
  16   *   DESCRIPTION: Provides u32regex_iterator implementation.
  17   */
  18
  19 #ifndef BOOST_REGEX_V4_U32REGEX_ITERATOR_HPP
  20 #define BOOST_REGEX_V4_U32REGEX_ITERATOR_HPP
  21
  22 namespace boost{
  23
  24 #ifdef BOOST_HAS_ABI_HEADERS
  25 #  include BOOST_ABI_PREFIX
  26 #endif
  27
  28 template <class BidirectionalIterator>
  29 class u32regex_iterator_implementation
  30 {
  31    typedef u32regex regex_type;
  32
  33    match_results<BidirectionalIterator> what;  // current match
  34    BidirectionalIterator                base;  // start of sequence
  35    BidirectionalIterator                end;   // end of sequence
  36    const regex_type                     re;   // the expression
  37    match_flag_type                      flags; // flags for matching
  38
  39 public:
  40    u32regex_iterator_implementation(const regex_type* p, BidirectionalIterator last, match_flag_type f)
  41       : base(), end(last), re(*p), flags(f){}
  42    bool init(BidirectionalIterator first)
  43    {
  44       base = first;
  45       return u32regex_search(first, end, what, re, flags, base);
  46    }
  47    bool compare(const u32regex_iterator_implementation& that)
  48    {
  49       if(this == &that) return true;
  50       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);
  51    }
  52    const match_results<BidirectionalIterator>& get()
  53    { return what; }
  54    bool next()
  55    {
  56       //if(what.prefix().first != what[0].second)
  57       //   flags |= match_prev_avail;
  58       BidirectionalIterator next_start = what[0].second;
  59       match_flag_type f(flags);
  60       if(!what.length())
  61          f |= regex_constants::match_not_initial_null;
  62       //if(base != next_start)
  63       //   f |= regex_constants::match_not_bob;
  64       bool result = u32regex_search(next_start, end, what, re, f, base);
  65       if(result)
  66          what.set_base(base);
  67       return result;
  68    }
  69 private:
  70    u32regex_iterator_implementation& operator=(const u32regex_iterator_implementation&);
  71 };
  72
  73 template <class BidirectionalIterator>
  74 class u32regex_iterator
  75 {
  76 private:
  77    typedef u32regex_iterator_implementation<BidirectionalIterator> impl;
  78    typedef shared_ptr<impl> pimpl;
  79 public:
  80    typedef          u32regex                                                regex_type;
  81    typedef          match_results<BidirectionalIterator>                    value_type;
  82    typedef typename BOOST_REGEX_DETAIL_NS::regex_iterator_traits<BidirectionalIterator>::difference_type
  83                                                                             difference_type;
  84    typedef          const value_type*                                       pointer;
  85    typedef          const value_type&                                       reference;
  86    typedef          std::forward_iterator_tag                               iterator_category;
  87
  88    u32regex_iterator(){}
  89    u32regex_iterator(BidirectionalIterator a, BidirectionalIterator b,
  90                   const regex_type& re,
  91                   match_flag_type m = match_default)
  92                   : pdata(new impl(&re, b, m))
  93    {
  94       if(!pdata->init(a))
  95       {
  96          pdata.reset();
  97       }
  98    }
  99    u32regex_iterator(const u32regex_iterator& that)
 100       : pdata(that.pdata) {}
 101    u32regex_iterator& operator=(const u32regex_iterator& that)
 102    {
 103       pdata = that.pdata;
 104       return *this;
 105    }
 106    bool operator==(const u32regex_iterator& that)const
 107    {
 108       if((pdata.get() == 0) || (that.pdata.get() == 0))
 109          return pdata.get() == that.pdata.get();
 110       return pdata->compare(*(that.pdata.get()));
 111    }
 112    bool operator!=(const u32regex_iterator& that)const
 113    { return !(*this == that); }
 114    const value_type& operator*()const
 115    { return pdata->get(); }
 116    const value_type* operator->()const
 117    { return &(pdata->get()); }
 118    u32regex_iterator& operator++()
 119    {
 120       cow();
 121       if(0 == pdata->next())
 122       {
 123          pdata.reset();
 124       }
 125       return *this;
 126    }
 127    u32regex_iterator operator++(int)
 128    {
 129       u32regex_iterator result(*this);
 130       ++(*this);
 131       return result;
 132    }
 133 private:
 134
 135    pimpl pdata;
 136
 137    void cow()
 138    {
 139       // copy-on-write
 140       if(pdata.get() && !pdata.unique())
 141       {
 142          pdata.reset(new impl(*(pdata.get())));
 143       }
 144    }
 145 };
 146
 147 typedef u32regex_iterator<const char*> utf8regex_iterator;
 148 typedef u32regex_iterator<const UChar*> utf16regex_iterator;
 149 typedef u32regex_iterator<const UChar32*> utf32regex_iterator;
 150
 151 inline u32regex_iterator<const char*> make_u32regex_iterator(const char* p, const u32regex& e, regex_constants::match_flag_type m = regex_constants::match_default)
 152 {
 153    return u32regex_iterator<const char*>(p, p+std::strlen(p), e, m);
 154 }
 155 #ifndef BOOST_NO_WREGEX
 156 inline u32regex_iterator<const wchar_t*> make_u32regex_iterator(const wchar_t* p, const u32regex& e, regex_constants::match_flag_type m = regex_constants::match_default)
 157 {
 158    return u32regex_iterator<const wchar_t*>(p, p+std::wcslen(p), e, m);
 159 }
 160 #endif
 161 #if !defined(BOOST_REGEX_UCHAR_IS_WCHAR_T)
 162 inline u32regex_iterator<const UChar*> make_u32regex_iterator(const UChar* p, const u32regex& e, regex_constants::match_flag_type m = regex_constants::match_default)
 163 {
 164    return u32regex_iterator<const UChar*>(p, p+u_strlen(p), e, m);
 165 }
 166 #endif
 167 template <class charT, class Traits, class Alloc>
 168 inline u32regex_iterator<typename std::basic_string<charT, Traits, Alloc>::const_iterator> make_u32regex_iterator(const std::basic_string<charT, Traits, Alloc>& p, const u32regex& e, regex_constants::match_flag_type m = regex_constants::match_default)
 169 {
 170    typedef typename std::basic_string<charT, Traits, Alloc>::const_iterator iter_type;
 171    return u32regex_iterator<iter_type>(p.begin(), p.end(), e, m);
 172 }
 173 inline u32regex_iterator<const UChar*> make_u32regex_iterator(const U_NAMESPACE_QUALIFIER UnicodeString& s, const u32regex& e, regex_constants::match_flag_type m = regex_constants::match_default)
 174 {
 175    return u32regex_iterator<const UChar*>(s.getBuffer(), s.getBuffer() + s.length(), e, m);
 176 }
 177
 178 #ifdef BOOST_HAS_ABI_HEADERS
 179 #  include BOOST_ABI_SUFFIX
 180 #endif
 181
 182 } // namespace boost
 183
 184 #endif // BOOST_REGEX_V4_REGEX_ITERATOR_HPP
 185