mirror of
https://github.com/mozilla/gecko-dev.git
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620 lines
12 KiB
C++
620 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: NPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2000
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Scott Collins <scc@mozilla.org> (original author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the NPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the NPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsCharTraits_h___
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#define nsCharTraits_h___
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#ifndef nsStringDefines_h___
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#include "nsStringDefines.h"
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#endif
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#include <ctype.h>
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// for |EOF|, |WEOF|
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#define FORCED_CPP_2BYTE_WCHAR_T
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// disable special optimizations for now through this hack
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#if defined(HAVE_CPP_2BYTE_WCHAR_T) && !defined(FORCED_CPP_2BYTE_WCHAR_T)
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#define USE_CPP_WCHAR_FUNCS
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#endif
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#ifdef USE_CPP_WCHAR_FUNCS
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#include <wchar.h>
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// for |wmemset|, et al
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#endif
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#include <string.h>
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// for |memcpy|, et al
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#ifndef nscore_h___
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#include "nscore.h"
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// for |PRUnichar|
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#endif
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#ifndef nsStringIteratorUtils_h___
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#include "nsStringIteratorUtils.h"
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#endif
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#ifdef HAVE_CPP_BOOL
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typedef bool nsCharTraits_bool;
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#else
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typedef PRBool nsCharTraits_bool;
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#endif
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template <class CharT> struct nsCharTraits {};
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NS_SPECIALIZE_TEMPLATE
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struct nsCharTraits<PRUnichar>
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{
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typedef PRUnichar char_type;
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typedef PRUint16 unsigned_char_type;
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typedef char incompatible_char_type;
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static
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void
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assign( char_type& lhs, char_type rhs )
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{
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lhs = rhs;
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}
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// integer representation of characters:
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#ifdef USE_CPP_WCHAR_FUNCS
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typedef wint_t int_type;
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#else
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typedef int int_type;
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#endif
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static
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char_type
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to_char_type( int_type c )
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{
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return char_type(c);
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}
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static
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int_type
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to_int_type( char_type c )
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{
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return int_type( NS_STATIC_CAST(unsigned_char_type, c) );
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}
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static
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nsCharTraits_bool
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eq_int_type( int_type lhs, int_type rhs )
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{
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return lhs == rhs;
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}
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// |char_type| comparisons:
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static
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nsCharTraits_bool
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eq( char_type lhs, char_type rhs )
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{
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return lhs == rhs;
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}
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static
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nsCharTraits_bool
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lt( char_type lhs, char_type rhs )
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{
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return lhs < rhs;
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}
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// operations on s[n] arrays:
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static
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char_type*
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move( char_type* s1, const char_type* s2, size_t n )
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{
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return NS_STATIC_CAST(char_type*, memmove(s1, s2, n * sizeof(char_type)));
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}
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static
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char_type*
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copy( char_type* s1, const char_type* s2, size_t n )
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{
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return NS_STATIC_CAST(char_type*, memcpy(s1, s2, n * sizeof(char_type)));
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}
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static
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char_type*
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assign( char_type* s, size_t n, char_type c )
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{
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#ifdef USE_CPP_WCHAR_FUNCS
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return NS_STATIC_CAST(char_type*, wmemset(s, to_int_type(c), n));
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#else
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char_type* result = s;
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while ( n-- )
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assign(*s++, c);
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return result;
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#endif
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}
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static
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int
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compare( const char_type* s1, const char_type* s2, size_t n )
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{
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#ifdef USE_CPP_WCHAR_FUNCS
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return wmemcmp(s1, s2, n);
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#else
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for ( ; n--; ++s1, ++s2 )
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{
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if ( lt(*s1, *s2) )
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return -1;
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if ( lt(*s2, *s1) )
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return 1;
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}
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return 0;
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#endif
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}
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static
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size_t
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length( const char_type* s )
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{
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#ifdef USE_CPP_WCHAR_FUNCS
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return wcslen(s);
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#else
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size_t result = 0;
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while ( !eq(*s++, char_type(0)) )
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++result;
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return result;
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#endif
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}
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static
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const char_type*
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find( const char_type* s, size_t n, char_type c )
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{
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#ifdef USE_CPP_WCHAR_FUNCS
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return NS_REINTERPRET_CAST(const char_type*, wmemchr(s, to_int_type(c), n));
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#else
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while ( n-- )
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{
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if ( eq(*s, c) )
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return s;
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++s;
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}
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return 0;
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#endif
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}
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#if 0
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// I/O related:
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typedef streamoff off_type;
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typedef streampos pos_type;
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typedef mbstate_t state_type;
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static
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int_type
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eof()
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{
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#ifdef USE_CPP_WCHAR_FUNCS
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return WEOF;
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#else
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return EOF;
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#endif
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}
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static
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int_type
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not_eof( int_type c )
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{
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return eq_int_type(c, eof()) ? ~eof() : c;
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}
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// static state_type get_state( pos_type );
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#endif
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};
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NS_SPECIALIZE_TEMPLATE
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struct nsCharTraits<char>
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{
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typedef char char_type;
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typedef unsigned char unsigned_char_type;
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typedef PRUnichar incompatible_char_type;
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static
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void
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assign( char_type& lhs, char_type rhs )
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{
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lhs = rhs;
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}
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// integer representation of characters:
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typedef int int_type;
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static
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char_type
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to_char_type( int_type c )
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{
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return char_type(c);
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}
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static
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int_type
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to_int_type( char_type c )
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{
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return int_type( NS_STATIC_CAST(unsigned_char_type, c) );
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}
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static
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nsCharTraits_bool
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eq_int_type( int_type lhs, int_type rhs )
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{
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return lhs == rhs;
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}
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// |char_type| comparisons:
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static
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nsCharTraits_bool
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eq( char_type lhs, char_type rhs )
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{
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return lhs == rhs;
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}
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static
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nsCharTraits_bool
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lt( char_type lhs, char_type rhs )
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{
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return lhs < rhs;
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}
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// operations on s[n] arrays:
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static
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char_type*
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move( char_type* s1, const char_type* s2, size_t n )
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{
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return NS_STATIC_CAST(char_type*, memmove(s1, s2, n * sizeof(char_type)));
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}
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static
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char_type*
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copy( char_type* s1, const char_type* s2, size_t n )
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{
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return NS_STATIC_CAST(char_type*, memcpy(s1, s2, n * sizeof(char_type)));
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}
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static
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char_type*
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assign( char_type* s, size_t n, char_type c )
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{
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return NS_STATIC_CAST(char_type*, memset(s, to_int_type(c), n));
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}
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static
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int
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compare( const char_type* s1, const char_type* s2, size_t n )
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{
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return memcmp(s1, s2, n);
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}
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static
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size_t
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length( const char_type* s )
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{
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return strlen(s);
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}
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static
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const char_type*
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find( const char_type* s, size_t n, char_type c )
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{
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return NS_REINTERPRET_CAST(const char_type*, memchr(s, to_int_type(c), n));
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}
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#if 0
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// I/O related:
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typedef streamoff off_type;
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typedef streampos pos_type;
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typedef mbstate_t state_type;
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static
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int_type
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eof()
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{
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return EOF;
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}
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static
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int_type
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not_eof( int_type c )
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{
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return eq_int_type(c, eof()) ? ~eof() : c;
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}
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// static state_type get_state( pos_type );
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#endif
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};
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template <class InputIterator>
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struct nsCharSourceTraits
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{
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typedef typename InputIterator::difference_type difference_type;
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#if 0
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static
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PRUint32
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distance( const InputIterator& first, const InputIterator& last )
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{
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// ...
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}
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#endif
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static
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PRUint32
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readable_distance( const InputIterator& iter )
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{
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return iter.size_forward();
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}
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static
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PRUint32
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readable_distance( const InputIterator& first, const InputIterator& last )
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{
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return PRUint32(SameFragment(first, last) ? last.get()-first.get() : first.size_forward());
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}
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static
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const typename InputIterator::value_type*
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read( const InputIterator& iter )
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{
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return iter.get();
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}
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static
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void
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advance( InputIterator& s, difference_type n )
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{
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s.advance(n);
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}
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};
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#ifdef HAVE_CPP_PARTIAL_SPECIALIZATION
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template <class CharT>
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struct nsCharSourceTraits<CharT*>
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{
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typedef ptrdiff_t difference_type;
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#if 0
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static
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PRUint32
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distance( CharT* first, CharT* last )
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{
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return PRUint32(last-first);
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}
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#endif
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static
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PRUint32
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readable_distance( CharT* s )
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{
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return PRUint32(nsCharTraits<CharT>::length(s));
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// return numeric_limits<PRUint32>::max();
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}
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static
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PRUint32
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readable_distance( CharT* first, CharT* last )
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{
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return PRUint32(last-first);
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}
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static
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const CharT*
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read( CharT* s )
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{
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return s;
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}
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static
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void
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advance( CharT*& s, difference_type n )
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{
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s += n;
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}
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};
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#else
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NS_SPECIALIZE_TEMPLATE
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struct nsCharSourceTraits<const char*>
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{
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typedef ptrdiff_t difference_type;
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#if 0
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static
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PRUint32
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distance( const char* first, const char* last )
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{
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return PRUint32(last-first);
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}
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#endif
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static
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PRUint32
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readable_distance( const char* s )
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{
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return PRUint32(nsCharTraits<char>::length(s));
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// return numeric_limits<PRUint32>::max();
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}
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static
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PRUint32
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readable_distance( const char* first, const char* last )
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{
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return PRUint32(last-first);
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}
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static
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const char*
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read( const char* s )
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{
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return s;
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}
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static
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void
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advance( const char*& s, difference_type n )
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{
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s += n;
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}
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};
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NS_SPECIALIZE_TEMPLATE
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struct nsCharSourceTraits<const PRUnichar*>
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{
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typedef ptrdiff_t difference_type;
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#if 0
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static
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PRUint32
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distance( const PRUnichar* first, const PRUnichar* last )
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{
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return PRUint32(last-first);
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}
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#endif
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static
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PRUint32
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readable_distance( const PRUnichar* s )
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{
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return PRUint32(nsCharTraits<PRUnichar>::length(s));
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// return numeric_limits<PRUint32>::max();
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}
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static
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PRUint32
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readable_distance( const PRUnichar* first, const PRUnichar* last )
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{
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return PRUint32(last-first);
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}
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static
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const PRUnichar*
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read( const PRUnichar* s )
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{
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return s;
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}
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static
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void
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advance( const PRUnichar*& s, difference_type n )
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{
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s += n;
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}
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};
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#endif
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template <class OutputIterator>
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struct nsCharSinkTraits
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{
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static
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PRUint32
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write( OutputIterator& iter, const typename OutputIterator::value_type* s, PRUint32 n )
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{
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return iter.write(s, n);
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}
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};
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#ifdef HAVE_CPP_PARTIAL_SPECIALIZATION
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template <class CharT>
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struct nsCharSinkTraits<CharT*>
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{
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static
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PRUint32
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write( CharT*& iter, const CharT* s, PRUint32 n )
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{
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nsCharTraits<CharT>::move(iter, s, n);
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iter += n;
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return n;
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}
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};
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#else
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NS_SPECIALIZE_TEMPLATE
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struct nsCharSinkTraits<char*>
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{
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static
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PRUint32
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write( char*& iter, const char* s, PRUint32 n )
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{
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nsCharTraits<char>::move(iter, s, n);
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iter += n;
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return n;
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}
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};
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NS_SPECIALIZE_TEMPLATE
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struct nsCharSinkTraits<PRUnichar*>
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{
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static
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PRUint32
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write( PRUnichar*& iter, const PRUnichar* s, PRUint32 n )
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{
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nsCharTraits<PRUnichar>::move(iter, s, n);
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iter += n;
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return n;
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}
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};
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#endif
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#endif // !defined(nsCharTraits_h___)
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