mirror of
https://github.com/rn10950/RetroZilla.git
synced 2024-09-14 09:10:14 +02:00
816 lines
19 KiB
C++
816 lines
19 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: MPL 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 Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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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 of the GNU General Public License Version 2 or later (the "GPL"),
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* or 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 MPL, 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 MPL, 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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#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 nsDebug_h__
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#include "nsDebug.h"
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// for NS_ASSERTION
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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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// Some macros for working with PRUnichar
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#define PLANE1_BASE PRUint32(0x00010000)
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// High surrogates are in the range 0xD800 -- OxDBFF
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#define IS_HIGH_SURROGATE(u) ((PRUnichar(u) & 0xFC00) == 0xD800)
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// Low surrogates are in the range 0xDC00 -- 0xDFFF
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#define IS_LOW_SURROGATE(u) ((PRUnichar(u) & 0xFC00) == 0xDC00)
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// Faster than testing IS_HIGH_SURROGATE || IS_LOW_SURROGATE
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#define IS_SURROGATE(u) ((PRUnichar(u) & 0xF800) == 0xD800)
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// Everything else is not a surrogate: 0x000 -- 0xD7FF, 0xE000 -- 0xFFFF
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// N = (H - 0xD800) * 0x400 + 0x10000 + (L - 0xDC00)
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// I wonder whether we could somehow assert that H is a high surrogate
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// and L is a low surrogate
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#define SURROGATE_TO_UCS4(h, l) (((PRUint32(h) & 0x03FF) << 10) + \
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(PRUint32(l) & 0x03FF) + PLANE1_BASE)
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// Extract surrogates from a UCS4 char
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// See unicode specification 3.7 for following math.
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#define H_SURROGATE(c) PRUnichar(PRUnichar((PRUint32(c) - PLANE1_BASE) >> 10) | \
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PRUnichar(0xD800))
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#define L_SURROGATE(c) PRUnichar(PRUnichar((PRUint32(c) - PLANE1_BASE) & 0x03FF) | \
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PRUnichar(0xDC00))
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#define IS_IN_BMP(ucs) (PRUint32(ucs) < PLANE1_BASE)
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#define UCS2_REPLACEMENT_CHAR PRUnichar(0xFFFD)
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#define UCS_END PRUint32(0x00110000)
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#define IS_VALID_CHAR(c) ((PRUint32(c) < UCS_END) && !IS_SURROGATE(c))
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#define ENSURE_VALID_CHAR(c) (IS_VALID_CHAR(c) ? (c) : UCS2_REPLACEMENT_CHAR)
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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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NS_COM static const char_type *sEmptyBuffer;
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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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copyASCII( char_type* s1, const char* s2, size_t n )
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{
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for (char_type* s = s1; n--; ++s, ++s2) {
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NS_ASSERTION(!(*s2 & ~0x7F), "Unexpected non-ASCII character");
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*s = *s2;
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}
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return s1;
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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 ( !eq(*s1, *s2) )
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return to_int_type(*s1) - to_int_type(*s2);
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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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int
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compareASCII( const char_type* s1, const char* s2, size_t n )
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{
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for ( ; n--; ++s1, ++s2 )
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{
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NS_ASSERTION(!(*s2 & ~0x7F), "Unexpected non-ASCII character");
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if ( !eq_int_type(to_int_type(*s1), to_int_type(*s2)) )
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return to_int_type(*s1) - to_int_type(*s2);
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}
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return 0;
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}
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// this version assumes that s2 is null-terminated and s1 has length n.
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// if s1 is shorter than s2 then we return -1; if s1 is longer than s2,
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// we return 1.
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static
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int
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compareASCIINullTerminated( const char_type* s1, size_t n, const char* s2 )
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{
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for ( ; n--; ++s1, ++s2 )
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{
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if ( !*s2 )
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return 1;
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NS_ASSERTION(!(*s2 & ~0x7F), "Unexpected non-ASCII character");
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if ( !eq_int_type(to_int_type(*s1), to_int_type(*s2)) )
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return to_int_type(*s1) - to_int_type(*s2);
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}
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if ( *s2 )
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return -1;
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return 0;
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}
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/**
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* Convert c to its lower-case form, but only if the lower-case form is
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* ASCII. Otherwise leave it alone.
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*
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* There are only two non-ASCII Unicode characters whose lowercase
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* equivalents are ASCII: KELVIN SIGN and LATIN CAPITAL LETTER I WITH
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* DOT ABOVE. So it's a simple matter to handle those explicitly.
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*/
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static
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char_type
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ASCIIToLower( char_type c )
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{
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if (c < 0x100)
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return (c >= 'A' && c <= 'Z') ? c + ('a' - 'A') : c;
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else
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{
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if (c == 0x212A) // KELVIN SIGN
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return 'k';
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if (c == 0x0130) // LATIN CAPITAL LETTER I WITH DOT ABOVE
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return 'i';
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return c;
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}
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}
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static
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int
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compareLowerCaseToASCII( const char_type* s1, const char* s2, size_t n )
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{
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for ( ; n--; ++s1, ++s2 )
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{
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NS_ASSERTION(!(*s2 & ~0x7F), "Unexpected non-ASCII character");
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NS_ASSERTION(!(*s2 >= 'A' && *s2 <= 'Z'),
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"Unexpected uppercase character");
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char_type lower_s1 = ASCIIToLower(*s1);
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if ( lower_s1 != to_char_type(*s2) )
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return to_int_type(lower_s1) - to_int_type(*s2);
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}
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return 0;
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}
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// this version assumes that s2 is null-terminated and s1 has length n.
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// if s1 is shorter than s2 then we return -1; if s1 is longer than s2,
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// we return 1.
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static
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int
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compareLowerCaseToASCIINullTerminated( const char_type* s1, size_t n, const char* s2 )
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{
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for ( ; n--; ++s1, ++s2 )
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{
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if ( !*s2 )
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return 1;
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NS_ASSERTION(!(*s2 & ~0x7F), "Unexpected non-ASCII character");
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NS_ASSERTION(!(*s2 >= 'A' && *s2 <= 'Z'),
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"Unexpected uppercase character");
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char_type lower_s1 = ASCIIToLower(*s1);
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if ( lower_s1 != to_char_type(*s2) )
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return to_int_type(lower_s1) - to_int_type(*s2);
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}
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if ( *s2 )
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return -1;
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return 0;
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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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NS_COM static const char_type *sEmptyBuffer;
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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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copyASCII( char_type* s1, const char* s2, size_t n )
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{
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return copy(s1, s2, n);
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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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int
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compareASCII( const char_type* s1, const char* s2, size_t n )
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{
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#ifdef DEBUG
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for (size_t i = 0; i < n; ++i)
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{
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NS_ASSERTION(!(s2[i] & ~0x7F), "Unexpected non-ASCII character");
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}
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#endif
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return compare(s1, s2, n);
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}
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// this version assumes that s2 is null-terminated and s1 has length n.
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// if s1 is shorter than s2 then we return -1; if s1 is longer than s2,
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// we return 1.
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static
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int
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compareASCIINullTerminated( const char_type* s1, size_t n, const char* s2 )
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{
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// can't use strcmp here because we don't want to stop when s1
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// contains a null
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for ( ; n--; ++s1, ++s2 )
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{
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if ( !*s2 )
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return 1;
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NS_ASSERTION(!(*s2 & ~0x7F), "Unexpected non-ASCII character");
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if ( *s1 != *s2 )
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return to_int_type(*s1) - to_int_type(*s2);
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}
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if ( *s2 )
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return -1;
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return 0;
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}
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/**
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* Convert c to its lower-case form, but only if c is ASCII.
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*/
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static
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char_type
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ASCIIToLower( char_type c )
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{
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return (c >= 'A' && c <= 'Z') ? (c + ('a' - 'A')) : c;
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}
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static
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int
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compareLowerCaseToASCII( const char_type* s1, const char* s2, size_t n )
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{
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for ( ; n--; ++s1, ++s2 )
|
|
{
|
|
NS_ASSERTION(!(*s2 & ~0x7F), "Unexpected non-ASCII character");
|
|
NS_ASSERTION(!(*s2 >= 'A' && *s2 <= 'Z'),
|
|
"Unexpected uppercase character");
|
|
char_type lower_s1 = ASCIIToLower(*s1);
|
|
if ( lower_s1 != *s2 )
|
|
return to_int_type(lower_s1) - to_int_type(*s2);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
// this version assumes that s2 is null-terminated and s1 has length n.
|
|
// if s1 is shorter than s2 then we return -1; if s1 is longer than s2,
|
|
// we return 1.
|
|
static
|
|
int
|
|
compareLowerCaseToASCIINullTerminated( const char_type* s1, size_t n, const char* s2 )
|
|
{
|
|
for ( ; n--; ++s1, ++s2 )
|
|
{
|
|
if ( !*s2 )
|
|
return 1;
|
|
NS_ASSERTION(!(*s2 & ~0x7F), "Unexpected non-ASCII character");
|
|
NS_ASSERTION(!(*s2 >= 'A' && *s2 <= 'Z'),
|
|
"Unexpected uppercase character");
|
|
char_type lower_s1 = ASCIIToLower(*s1);
|
|
if ( lower_s1 != *s2 )
|
|
return to_int_type(lower_s1) - to_int_type(*s2);
|
|
}
|
|
|
|
if ( *s2 )
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static
|
|
size_t
|
|
length( const char_type* s )
|
|
{
|
|
return strlen(s);
|
|
}
|
|
|
|
static
|
|
const char_type*
|
|
find( const char_type* s, size_t n, char_type c )
|
|
{
|
|
return NS_REINTERPRET_CAST(const char_type*, memchr(s, to_int_type(c), n));
|
|
}
|
|
|
|
#if 0
|
|
// I/O related:
|
|
|
|
typedef streamoff off_type;
|
|
typedef streampos pos_type;
|
|
typedef mbstate_t state_type;
|
|
|
|
static
|
|
int_type
|
|
eof()
|
|
{
|
|
return EOF;
|
|
}
|
|
|
|
static
|
|
int_type
|
|
not_eof( int_type c )
|
|
{
|
|
return eq_int_type(c, eof()) ? ~eof() : c;
|
|
}
|
|
|
|
// static state_type get_state( pos_type );
|
|
#endif
|
|
};
|
|
|
|
template <class InputIterator>
|
|
struct nsCharSourceTraits
|
|
{
|
|
typedef typename InputIterator::difference_type difference_type;
|
|
|
|
static
|
|
PRUint32
|
|
readable_distance( const InputIterator& first, const InputIterator& last )
|
|
{
|
|
// assumes single fragment
|
|
return last.get() - first.get();
|
|
}
|
|
|
|
static
|
|
const typename InputIterator::value_type*
|
|
read( const InputIterator& iter )
|
|
{
|
|
return iter.get();
|
|
}
|
|
|
|
static
|
|
void
|
|
advance( InputIterator& s, difference_type n )
|
|
{
|
|
s.advance(n);
|
|
}
|
|
};
|
|
|
|
#ifdef HAVE_CPP_PARTIAL_SPECIALIZATION
|
|
|
|
template <class CharT>
|
|
struct nsCharSourceTraits<CharT*>
|
|
{
|
|
typedef ptrdiff_t difference_type;
|
|
|
|
static
|
|
PRUint32
|
|
readable_distance( CharT* s )
|
|
{
|
|
return PRUint32(nsCharTraits<CharT>::length(s));
|
|
// return numeric_limits<PRUint32>::max();
|
|
}
|
|
|
|
static
|
|
PRUint32
|
|
readable_distance( CharT* first, CharT* last )
|
|
{
|
|
return PRUint32(last-first);
|
|
}
|
|
|
|
static
|
|
const CharT*
|
|
read( CharT* s )
|
|
{
|
|
return s;
|
|
}
|
|
|
|
static
|
|
void
|
|
advance( CharT*& s, difference_type n )
|
|
{
|
|
s += n;
|
|
}
|
|
};
|
|
|
|
#else
|
|
|
|
NS_SPECIALIZE_TEMPLATE
|
|
struct nsCharSourceTraits<const char*>
|
|
{
|
|
typedef ptrdiff_t difference_type;
|
|
|
|
static
|
|
PRUint32
|
|
readable_distance( const char* s )
|
|
{
|
|
return PRUint32(nsCharTraits<char>::length(s));
|
|
// return numeric_limits<PRUint32>::max();
|
|
}
|
|
|
|
static
|
|
PRUint32
|
|
readable_distance( const char* first, const char* last )
|
|
{
|
|
return PRUint32(last-first);
|
|
}
|
|
|
|
static
|
|
const char*
|
|
read( const char* s )
|
|
{
|
|
return s;
|
|
}
|
|
|
|
static
|
|
void
|
|
advance( const char*& s, difference_type n )
|
|
{
|
|
s += n;
|
|
}
|
|
};
|
|
|
|
|
|
NS_SPECIALIZE_TEMPLATE
|
|
struct nsCharSourceTraits<const PRUnichar*>
|
|
{
|
|
typedef ptrdiff_t difference_type;
|
|
|
|
static
|
|
PRUint32
|
|
readable_distance( const PRUnichar* s )
|
|
{
|
|
return PRUint32(nsCharTraits<PRUnichar>::length(s));
|
|
// return numeric_limits<PRUint32>::max();
|
|
}
|
|
|
|
static
|
|
PRUint32
|
|
readable_distance( const PRUnichar* first, const PRUnichar* last )
|
|
{
|
|
return PRUint32(last-first);
|
|
}
|
|
|
|
static
|
|
const PRUnichar*
|
|
read( const PRUnichar* s )
|
|
{
|
|
return s;
|
|
}
|
|
|
|
static
|
|
void
|
|
advance( const PRUnichar*& s, difference_type n )
|
|
{
|
|
s += n;
|
|
}
|
|
};
|
|
|
|
#endif
|
|
|
|
|
|
template <class OutputIterator>
|
|
struct nsCharSinkTraits
|
|
{
|
|
static
|
|
PRUint32
|
|
write( OutputIterator& iter, const typename OutputIterator::value_type* s, PRUint32 n )
|
|
{
|
|
return iter.write(s, n);
|
|
}
|
|
};
|
|
|
|
#ifdef HAVE_CPP_PARTIAL_SPECIALIZATION
|
|
|
|
template <class CharT>
|
|
struct nsCharSinkTraits<CharT*>
|
|
{
|
|
static
|
|
PRUint32
|
|
write( CharT*& iter, const CharT* s, PRUint32 n )
|
|
{
|
|
nsCharTraits<CharT>::move(iter, s, n);
|
|
iter += n;
|
|
return n;
|
|
}
|
|
};
|
|
|
|
#else
|
|
|
|
NS_SPECIALIZE_TEMPLATE
|
|
struct nsCharSinkTraits<char*>
|
|
{
|
|
static
|
|
PRUint32
|
|
write( char*& iter, const char* s, PRUint32 n )
|
|
{
|
|
nsCharTraits<char>::move(iter, s, n);
|
|
iter += n;
|
|
return n;
|
|
}
|
|
};
|
|
|
|
NS_SPECIALIZE_TEMPLATE
|
|
struct nsCharSinkTraits<PRUnichar*>
|
|
{
|
|
static
|
|
PRUint32
|
|
write( PRUnichar*& iter, const PRUnichar* s, PRUint32 n )
|
|
{
|
|
nsCharTraits<PRUnichar>::move(iter, s, n);
|
|
iter += n;
|
|
return n;
|
|
}
|
|
};
|
|
|
|
#endif
|
|
|
|
#endif // !defined(nsCharTraits_h___)
|