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gecko-dev/string/public/nsCharTraits.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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) 2000
* 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 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 NPL, 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 NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsCharTraits_h___
#define nsCharTraits_h___
#ifndef nsStringDefines_h___
#include "nsStringDefines.h"
#endif
#include <ctype.h>
// for |EOF|, |WEOF|
#define FORCED_CPP_2BYTE_WCHAR_T
// disable special optimizations for now through this hack
#if defined(HAVE_CPP_2BYTE_WCHAR_T) && !defined(FORCED_CPP_2BYTE_WCHAR_T)
#define USE_CPP_WCHAR_FUNCS
#endif
#ifdef USE_CPP_WCHAR_FUNCS
#include <wchar.h>
// for |wmemset|, et al
#endif
#include <string.h>
// for |memcpy|, et al
#ifndef nscore_h___
#include "nscore.h"
// for |PRUnichar|
#endif
#ifndef nsStringIteratorUtils_h___
#include "nsStringIteratorUtils.h"
#endif
#ifdef HAVE_CPP_BOOL
typedef bool nsCharTraits_bool;
#else
typedef PRBool nsCharTraits_bool;
#endif
template <class CharT> struct nsCharTraits {};
NS_SPECIALIZE_TEMPLATE
struct nsCharTraits<PRUnichar>
{
typedef PRUnichar char_type;
typedef PRUint16 unsigned_char_type;
typedef char incompatible_char_type;
static
void
assign( char_type& lhs, char_type rhs )
{
lhs = rhs;
}
// integer representation of characters:
#ifdef USE_CPP_WCHAR_FUNCS
typedef wint_t int_type;
#else
typedef int int_type;
#endif
static
char_type
to_char_type( int_type c )
{
return char_type(c);
}
static
int_type
to_int_type( char_type c )
{
return int_type( NS_STATIC_CAST(unsigned_char_type, c) );
}
static
nsCharTraits_bool
eq_int_type( int_type lhs, int_type rhs )
{
return lhs == rhs;
}
// |char_type| comparisons:
static
nsCharTraits_bool
eq( char_type lhs, char_type rhs )
{
return lhs == rhs;
}
static
nsCharTraits_bool
lt( char_type lhs, char_type rhs )
{
return lhs < rhs;
}
// operations on s[n] arrays:
static
char_type*
move( char_type* s1, const char_type* s2, size_t n )
{
return NS_STATIC_CAST(char_type*, memmove(s1, s2, n * sizeof(char_type)));
}
static
char_type*
copy( char_type* s1, const char_type* s2, size_t n )
{
return NS_STATIC_CAST(char_type*, memcpy(s1, s2, n * sizeof(char_type)));
}
static
char_type*
assign( char_type* s, size_t n, char_type c )
{
#ifdef USE_CPP_WCHAR_FUNCS
return NS_STATIC_CAST(char_type*, wmemset(s, to_int_type(c), n));
#else
char_type* result = s;
while ( n-- )
assign(*s++, c);
return result;
#endif
}
static
int
compare( const char_type* s1, const char_type* s2, size_t n )
{
return memcmp(s1, s2, n * sizeof(char_type));
}
static
size_t
length( const char_type* s )
{
#ifdef USE_CPP_WCHAR_FUNCS
return wcslen(s);
#else
size_t result = 0;
while ( !eq(*s++, char_type(0)) )
++result;
return result;
#endif
}
static
const char_type*
find( const char_type* s, size_t n, char_type c )
{
#ifdef USE_CPP_WCHAR_FUNCS
return NS_REINTERPRET_CAST(const char_type*, wmemchr(s, to_int_type(c), n));
#else
while ( n-- )
{
if ( eq(*s, c) )
return s;
++s;
}
return 0;
#endif
}
#if 0
// I/O related:
typedef streamoff off_type;
typedef streampos pos_type;
typedef mbstate_t state_type;
static
int_type
eof()
{
#ifdef USE_CPP_WCHAR_FUNCS
return WEOF;
#else
return EOF;
#endif
}
static
int_type
not_eof( int_type c )
{
return eq_int_type(c, eof()) ? ~eof() : c;
}
// static state_type get_state( pos_type );
#endif
};
NS_SPECIALIZE_TEMPLATE
struct nsCharTraits<char>
{
typedef char char_type;
typedef unsigned char unsigned_char_type;
typedef PRUnichar incompatible_char_type;
static
void
assign( char_type& lhs, char_type rhs )
{
lhs = rhs;
}
// integer representation of characters:
typedef int int_type;
static
char_type
to_char_type( int_type c )
{
return char_type(c);
}
static
int_type
to_int_type( char_type c )
{
return int_type( NS_STATIC_CAST(unsigned_char_type, c) );
}
static
nsCharTraits_bool
eq_int_type( int_type lhs, int_type rhs )
{
return lhs == rhs;
}
// |char_type| comparisons:
static
nsCharTraits_bool
eq( char_type lhs, char_type rhs )
{
return lhs == rhs;
}
static
nsCharTraits_bool
lt( char_type lhs, char_type rhs )
{
return lhs < rhs;
}
// operations on s[n] arrays:
static
char_type*
move( char_type* s1, const char_type* s2, size_t n )
{
return NS_STATIC_CAST(char_type*, memmove(s1, s2, n * sizeof(char_type)));
}
static
char_type*
copy( char_type* s1, const char_type* s2, size_t n )
{
return NS_STATIC_CAST(char_type*, memcpy(s1, s2, n * sizeof(char_type)));
}
static
char_type*
assign( char_type* s, size_t n, char_type c )
{
return NS_STATIC_CAST(char_type*, memset(s, to_int_type(c), n));
}
static
int
compare( const char_type* s1, const char_type* s2, size_t n )
{
return memcmp(s1, s2, n);
}
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;
#if 0
static
PRUint32
distance( const InputIterator& first, const InputIterator& last )
{
// ...
}
#endif
static
PRUint32
readable_distance( const InputIterator& iter )
{
return iter.size_forward();
}
static
PRUint32
readable_distance( const InputIterator& first, const InputIterator& last )
{
return PRUint32(SameFragment(first, last) ? last.get()-first.get() : first.size_forward());
}
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;
#if 0
static
PRUint32
distance( CharT* first, CharT* last )
{
return PRUint32(last-first);
}
#endif
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;
#if 0
static
PRUint32
distance( const char* first, const char* last )
{
return PRUint32(last-first);
}
#endif
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;
#if 0
static
PRUint32
distance( const PRUnichar* first, const PRUnichar* last )
{
return PRUint32(last-first);
}
#endif
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___)
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