Merged regex-4 branch.

[SVN r18430]

include/boost/regex/v4/regex_raw_buffer.hpp

@@ -0,0 +1,256 @@
+/*
+ *
+ * Copyright (c) 1998-2002
+ * 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_raw_buffer.hpp
+  *   VERSION      see <boost/version.hpp>
+  *   DESCRIPTION: Raw character buffer for regex code.
+  *                Note this is an internal header file included
+  *                by regex.hpp, do not include on its own.
+  */
+
+#ifndef BOOST_REGEX_RAW_BUFFER_HPP
+#define BOOST_REGEX_RAW_BUFFER_HPP
+
+#ifndef BOOST_REGEX_CONFIG_HPP
+#include <boost/regex/config.hpp>
+#endif
+
+namespace boost{
+   namespace re_detail{
+
+#ifdef __BORLANDC__
+   #pragma option push -a8 -b -Vx -Ve -pc
+#endif
+
+struct empty_padding{};
+
+union padding
+{
+   void* p;
+   unsigned int i;
+};
+
+template <int N>
+struct padding3
+{
+   enum{
+      padding_size = 8,
+      padding_mask = 7
+   };
+};
+
+template<>
+struct padding3<2>
+{
+   enum{
+      padding_size = 2,
+      padding_mask = 1
+   };
+};
+
+template<>
+struct padding3<4>
+{
+   enum{
+      padding_size = 4,
+      padding_mask = 3
+   };
+};
+
+template<>
+struct padding3<8>
+{
+   enum{
+      padding_size = 8,
+      padding_mask = 7
+   };
+};
+
+template<>
+struct padding3<16>
+{
+   enum{
+      padding_size = 16,
+      padding_mask = 15
+   };
+};
+
+enum{
+   padding_size = padding3<sizeof(padding)>::padding_size,
+   padding_mask = padding3<sizeof(padding)>::padding_mask
+};
+
+//
+// class raw_storage
+// basically this is a simplified vector<unsigned char>
+// this is used by reg_expression for expression storage
+//
+
+template <class Allocator>
+class raw_storage
+{
+public:
+   typedef Allocator allocator_type;
+   typedef typename boost::detail::rebind_allocator<unsigned char, allocator_type>::type alloc_inst_type;
+   typedef typename alloc_inst_type::size_type                                size_type;
+   typedef typename alloc_inst_type::pointer                                  pointer;
+private:
+   //
+   // empty member optimisation:
+   struct alloc_data : public alloc_inst_type
+   {
+      typename alloc_inst_type::pointer last;
+      alloc_data(const Allocator& a) : alloc_inst_type(a){}
+   } alloc_inst;
+   pointer start, end;
+public:
+
+   raw_storage(const Allocator& a = Allocator());
+   raw_storage(size_type n, const Allocator& a = Allocator());
+
+   ~raw_storage()
+   {
+      alloc_inst.deallocate(start, (alloc_inst.last - start));
+   }
+
+   void BOOST_REGEX_CALL resize(size_type n);
+   
+   void* BOOST_REGEX_CALL extend(size_type n)
+   {
+      if(size_type(alloc_inst.last - end) < n)
+         resize(n + (end - start));
+      register void* result = end;
+      end += n;
+      return result;
+   }
+
+   void* BOOST_REGEX_CALL insert(size_type pos, size_type n);
+
+   size_type BOOST_REGEX_CALL size()
+   {
+      return end - start;
+   }
+
+   size_type BOOST_REGEX_CALL capacity()
+   {
+      return alloc_inst.last - start;
+   }
+
+   void* BOOST_REGEX_CALL data()const
+   {
+      return start;
+   }
+
+   size_type BOOST_REGEX_CALL index(void* ptr)
+   {
+      return reinterpret_cast<unsigned char*>(ptr) - reinterpret_cast<unsigned char*>(data());
+   }
+
+   void BOOST_REGEX_CALL clear()
+   {
+      end = start;
+   }
+
+   void BOOST_REGEX_CALL align()
+   {
+      // move end up to a boundary:
+      end = reinterpret_cast<unsigned char*>(start) + (((reinterpret_cast<unsigned char*>(end) - reinterpret_cast<unsigned char*>(start)) + padding_mask) & ~padding_mask);
+   }
+
+   Allocator BOOST_REGEX_CALL allocator()const;
+   void swap(raw_storage& that)
+   {
+      std::swap(start, that.start);
+      std::swap(end, that.end);
+      std::swap(alloc_inst.last, that.alloc_inst.last);
+      std::swap(static_cast<alloc_inst_type&>(alloc_inst), static_cast<alloc_inst_type&>(that.alloc_inst));
+  }
+};
+
+template <class Allocator>
+raw_storage<Allocator>::raw_storage(const Allocator& a)
+  : alloc_inst(a)
+{
+  start = end = alloc_inst.allocate(1024);
+  BOOST_REGEX_NOEH_ASSERT(start)
+  alloc_inst.last = start + 1024;
+}
+
+template <class Allocator>
+raw_storage<Allocator>::raw_storage(size_type n, const Allocator& a)
+  : alloc_inst(a)
+{
+  start = end = alloc_inst.allocate(n);
+  BOOST_REGEX_NOEH_ASSERT(start)
+  alloc_inst.last = start + n;
+}
+
+template <class Allocator>
+Allocator BOOST_REGEX_CALL raw_storage<Allocator>::allocator()const
+{
+  return alloc_inst;
+}
+
+template <class Allocator>
+void BOOST_REGEX_CALL raw_storage<Allocator>::resize(size_type n)
+{
+   register size_type newsize = (alloc_inst.last - start) * 2;
+   register size_type datasize = end - start;
+   if(newsize < n)
+      newsize = n;
+   // extend newsize to WORD/DWORD boundary:
+   newsize = (newsize + padding_mask) & ~(padding_mask);
+
+   // allocate and copy data:
+   register unsigned char* ptr = alloc_inst.allocate(newsize);
+   BOOST_REGEX_NOEH_ASSERT(ptr)
+   std::memcpy(ptr, start, datasize);
+
+   // get rid of old buffer:
+   alloc_inst.deallocate(start, (alloc_inst.last - start));
+
+   // and set up pointers:
+   start = ptr;
+   end = ptr + datasize;
+   alloc_inst.last = ptr + newsize;
+}
+
+template <class Allocator>
+void* BOOST_REGEX_CALL raw_storage<Allocator>::insert(size_type pos, size_type n)
+{
+   jm_assert(pos <= size_type(end - start));
+   if(size_type(alloc_inst.last - end) < n)
+      resize(n + (end - start));
+   register void* result = start + pos;
+   std::memmove(start + pos + n, start + pos, (end - start) - pos);
+   end += n;
+   return result;
+}
+
+#ifdef __BORLANDC__
+  #pragma option pop
+#endif
+
+} // namespace re_detail
+} // namespace boost
+
+#endif
+
+
+
+
+