Merged regex-4 branch.

[SVN r18430]

include/boost/regex/v4/regex_iterator.hpp

@@ -0,0 +1,154 @@
+/*
+ *
+ * Copyright (c) 2003
+ * Dr John Maddock
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Dr John Maddock makes no representations
+ * about the suitability of this software for any purpose.
+ * It is provided "as is" without express or implied warranty.
+ *
+ */
+
+ /*
+  *   LOCATION:    see http://www.boost.org for most recent version.
+  *   FILE         regex_iterator.hpp
+  *   VERSION      see <boost/version.hpp>
+  *   DESCRIPTION: Provides regex_iterator implementation.
+  */
+
+#ifndef BOOST_REGEX_V4_REGEX_ITERATOR_HPP
+#define BOOST_REGEX_V4_REGEX_ITERATOR_HPP
+
+#include <boost/shared_ptr.hpp>
+
+namespace boost{
+
+template <class BidirectionalIterator, 
+          class charT,
+          class traits,
+          class Allocator>
+class regex_iterator_implementation 
+{
+   typedef basic_regex<charT, traits, Allocator> regex_type;
+
+   match_results<BidirectionalIterator> what;  // current match
+   BidirectionalIterator                base;  // start of sequence
+   BidirectionalIterator                end;   // end of sequence
+   const regex_type*                    pre;   // the expression
+   match_flag_type                      flags; // flags for matching
+
+public:
+   regex_iterator_implementation(const regex_type* p, BidirectionalIterator last, match_flag_type f)
+      : base(), end(last), pre(p), flags(f){}
+   bool init(BidirectionalIterator first)
+   {
+      base = first;
+      return regex_search(first, end, what, *pre, flags);
+   }
+   bool compare(const regex_iterator_implementation& that)
+   {
+      if(this == &that) return true;
+      return (pre == that.pre) && (end == that.end) && (flags == that.flags) && (what[0].first == that.what[0].first) && (what[0].second == that.what[0].second);
+   }
+   const match_results<BidirectionalIterator>& get()
+   { return what; }
+   bool next()
+   {
+      if(what.prefix().first != what[0].second)
+         flags |= match_prev_avail;
+      BidirectionalIterator next_start = what[0].second;
+      match_flag_type f(flags);
+      if(!what.length())
+         f |= regex_constants::match_not_initial_null;
+      bool result = regex_search(next_start, end, what, *pre, f);
+      if(result)
+         what.set_base(base);
+      return result;
+   }
+};
+
+template <class BidirectionalIterator, 
+          class charT = typename re_detail::regex_iterator_traits<BidirectionalIterator>::value_type,
+          class traits = regex_traits<charT>,
+          class Allocator = BOOST_DEFAULT_ALLOCATOR(charT) >
+class regex_iterator 
+{
+private:
+   typedef regex_iterator_implementation<BidirectionalIterator, charT, traits, Allocator> impl;
+   typedef shared_ptr<impl> pimpl;
+public:
+   typedef          basic_regex<charT, traits, Allocator>                   regex_type;
+   typedef          match_results<BidirectionalIterator>                    value_type;
+   typedef typename re_detail::regex_iterator_traits<BidirectionalIterator>::difference_type 
+                                                                            difference_type;
+   typedef          const value_type*                                       pointer;
+   typedef          const value_type&                                       reference; 
+   typedef          std::forward_iterator_tag                               iterator_category;
+   
+   regex_iterator(){}
+   regex_iterator(BidirectionalIterator a, BidirectionalIterator b, 
+                  const regex_type& re, 
+                  match_flag_type m = match_default)
+                  : pdata(new impl(&re, b, m))
+   {
+      if(!pdata->init(a))
+      {
+         pdata.reset();
+      }
+   }
+   regex_iterator(const regex_iterator& that)
+      : pdata(that.pdata) {}
+   regex_iterator& operator=(const regex_iterator& that)
+   {
+      pdata = that.pdata;
+      return *this;
+   }
+   bool operator==(const regex_iterator& that)
+   { 
+      if((pdata.get() == 0) || (that.pdata.get() == 0))
+         return pdata.get() == that.pdata.get();
+      return pdata->compare(*(that.pdata.get())); 
+   }
+   bool operator!=(const regex_iterator& that)
+   { return !(*this == that); }
+   const value_type& operator*()
+   { return pdata->get(); }
+   const value_type* operator->()
+   { return &(pdata->get()); }
+   regex_iterator& operator++()
+   {
+      cow();
+      if(0 == pdata->next())
+      {
+         pdata.reset();
+      }
+      return *this;
+   }
+   regex_iterator operator++(int)
+   {
+      regex_iterator result(*this);
+      ++(*this);
+      return result;
+   }
+private:
+
+   pimpl pdata;
+
+   void cow()
+   {
+      // copy-on-write
+      if(pdata.get() && !pdata.unique())
+      {
+         pdata.reset(new impl(*(pdata.get())));
+      }
+   }
+};
+
+
+} // namespace boost
+
+#endif // BOOST_REGEX_V4_REGEX_ITERATOR_HPP