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- /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
- /* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is mozilla.org code.
- *
- * The Initial Developer of the Original Code is
- * Netscape Communications Corporation.
- * Portions created by the Initial Developer are Copyright (C) 1998
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- * Scott Collins <scc@mozilla.org> (original author)
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either of the GNU General Public License Version 2 or later (the "GPL"),
- * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
-
- #ifndef nsAlgorithm_h___
- #define nsAlgorithm_h___
-
- #ifndef nsCharTraits_h___
- #include "nsCharTraits.h"
- // for |nsCharSourceTraits|, |nsCharSinkTraits|
- #endif
-
- #ifndef prtypes_h___
- #include "prtypes.h"
- // for |PRUint32|...
- #endif
-
- #ifndef nsDebug_h___
- #include "nsDebug.h"
- // for NS_ASSERTION
- #endif
-
- template <class T>
- inline
- const T&
- NS_MIN( const T& a, const T& b )
- {
- return b < a ? b : a;
- }
-
- template <class T>
- inline
- const T&
- NS_MAX( const T& a, const T& b )
- {
- return a > b ? a : b;
- }
-
- template <class InputIterator, class T>
- inline
- PRUint32
- NS_COUNT( InputIterator& first, const InputIterator& last, const T& value )
- {
- PRUint32 result = 0;
- for ( ; first != last; ++first )
- if ( *first == value )
- ++result;
- return result;
- }
-
- template <class InputIterator, class OutputIterator>
- inline
- OutputIterator&
- copy_string( InputIterator& first, const InputIterator& last, OutputIterator& result )
- {
- typedef nsCharSourceTraits<InputIterator> source_traits;
- typedef nsCharSinkTraits<OutputIterator> sink_traits;
-
- while ( first != last )
- {
- PRInt32 count_copied = PRInt32(sink_traits::write(result, source_traits::read(first), source_traits::readable_distance(first, last)));
- NS_ASSERTION(count_copied > 0, "|copy_string| will never terminate");
- source_traits::advance(first, count_copied);
- }
-
- return result;
- }
-
- template <class InputIterator, class OutputIterator>
- OutputIterator&
- copy_string_backward( const InputIterator& first, InputIterator& last, OutputIterator& result )
- {
- while ( first != last )
- {
- last.normalize_backward();
- result.normalize_backward();
- PRUint32 lengthToCopy = PRUint32( NS_MIN(last.size_backward(), result.size_backward()) );
- if ( first.fragment().mStart == last.fragment().mStart )
- lengthToCopy = NS_MIN(lengthToCopy, PRUint32(last.get() - first.get()));
-
- NS_ASSERTION(lengthToCopy, "|copy_string_backward| will never terminate");
-
- #ifdef _MSC_VER
- // XXX Visual C++ can't stomach 'typename' where it rightfully should
- nsCharTraits<OutputIterator::value_type>::move(result.get()-lengthToCopy, last.get()-lengthToCopy, lengthToCopy);
- #else
- nsCharTraits<typename OutputIterator::value_type>::move(result.get()-lengthToCopy, last.get()-lengthToCopy, lengthToCopy);
- #endif
-
- last.advance( -PRInt32(lengthToCopy) );
- result.advance( -PRInt32(lengthToCopy) );
- }
-
- return result;
- }
-
- #endif // !defined(nsAlgorithm_h___)
-