Initial boost-regex++ release

[SVN r7845]

include/boost/re_detail/regex_split.hpp

@@ -0,0 +1,154 @@
+/*
+ *
+ * Copyright (c) 1998-2000
+ * 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_split.hpp
+  *   VERSION      3.01
+  *   DESCRIPTION: Implements regex_split and associated functions.
+  *                Note this is an internal header file included
+  *                by regex.hpp, do not include on its own.
+  */
+
+#ifndef BOOST_REGEX_SPLIT_HPP
+#define BOOST_REGEX_SPLIT_HPP
+
+namespace boost{
+
+#ifdef __BORLANDC__
+   #if __BORLANDC__ == 0x530
+    #pragma option push -a4 -b -Ve
+   #elif __BORLANDC__ > 0x530
+    #pragma option push -a8 -b -Ve
+   #endif
+#endif
+
+namespace re_detail{
+
+template <class charT>
+const reg_expression<charT>& get_default_expression(charT)
+{
+   static const charT expression_text[] = { '\\', 's', '+', '\00', };
+   static const reg_expression<charT> e(expression_text);
+   return e;
+}
+
+template <class OutputIterator, class charT, class Traits1, class Alloc1, class Alloc2>
+class split_pred
+{
+   typedef std::basic_string<charT, Traits1, Alloc1> string_type;
+   typedef typename string_type::const_iterator iterator_type;
+   iterator_type* p_last;
+   OutputIterator* p_out;
+   std::size_t* p_max;
+   std::size_t initial_max;
+public:
+   split_pred(iterator_type* a, OutputIterator* b, std::size_t* c)
+      : p_last(a), p_out(b), p_max(c), initial_max(*c) {}
+
+   bool operator()(const match_results<iterator_type, Alloc2>& what);
+};
+
+template <class OutputIterator, class charT, class Traits1, class Alloc1, class Alloc2>
+bool split_pred<OutputIterator, charT, Traits1, Alloc1, Alloc2>::operator()
+   (const match_results<iterator_type, Alloc2>& what)
+{
+   *p_last = what[0].second;
+   if(what.size() > 1)
+   {
+      // output sub-expressions only:
+      for(unsigned i = 1; i < what.size(); ++i)
+      {
+         (*p_out) = static_cast<string_type>(what[i]);
+         ++(*p_out);
+         return --*p_max;
+      }
+   }
+   else
+   {
+      // output $` only if it's not-null or not at the start of the input:
+      const sub_match<iterator_type>& sub = what[-1];
+      if((sub.first != sub.second) || (*p_max != initial_max))
+      {
+         (*p_out) = static_cast<string_type>(sub);
+         ++(*p_out);
+         return --*p_max;
+      }
+   }
+   //
+   // initial null, do nothing:
+   return true;
+}
+
+} // namespace re_detail
+
+template <class OutputIterator, class charT, class Traits1, class Alloc1, class Traits2, class Alloc2>
+std::size_t regex_split(OutputIterator out,
+                   std::basic_string<charT, Traits1, Alloc1>& s, 
+                   const reg_expression<charT, Traits2, Alloc2>& e,
+                   unsigned flags,
+                   std::size_t max_split)
+{
+   typedef typename std::basic_string<charT, Traits1, Alloc1>::const_iterator ci_t;
+   ci_t last = s.begin();
+   std::size_t init_size = max_split;
+   re_detail::split_pred<OutputIterator, charT, Traits1, Alloc1, Alloc2> pred(&last, &out, &max_split);
+   ci_t i, j;
+   i = s.begin();
+   j = s.end();
+   regex_grep(pred, i, j, e, flags);
+   //
+   // if there is still input left, do a final push as long as max_split
+   // is not exhausted, and we're not splitting sub-expressions rather 
+   // than whitespace:
+   if(max_split && (last != s.end()) && (e.mark_count() == 1))
+   {
+      out = std::basic_string<charT, Traits1, Alloc1>((ci_t)last, (ci_t)s.end());
+      ++out;
+      last = s.end();
+   }
+   //
+   // delete from the string everything that has been processed so far:
+   s.erase(0, last - s.begin());
+   //
+   // return the number of new records pushed:
+   return init_size - max_split;
+}
+
+template <class OutputIterator, class charT, class Traits1, class Alloc1, class Traits2, class Alloc2>
+inline std::size_t regex_split(OutputIterator out,
+                   std::basic_string<charT, Traits1, Alloc1>& s, 
+                   const reg_expression<charT, Traits2, Alloc2>& e,
+                   unsigned flags = match_default)
+{
+   return regex_split(out, s, e, flags, UINT_MAX);
+}
+
+template <class OutputIterator, class charT, class Traits1, class Alloc1>
+inline std::size_t regex_split(OutputIterator out,
+                   std::basic_string<charT, Traits1, Alloc1>& s)
+{
+   return regex_split(out, s, re_detail::get_default_expression(charT(0)), match_default, UINT_MAX);
+}
+
+#ifdef __BORLANDC__
+ #if __BORLANDC__ > 0x520
+  #pragma option pop
+ #endif
+#endif
+
+} // namespace boost
+
+#endif