gecko-dev/string/public/nsLiteralString.h

94 lines
3.2 KiB
C

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* 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.
*
* The Initial Developer of the Original Code is Netscape
* Communications. Portions created by Netscape Communications are
* Copyright (C) 2001 by Netscape Communications. All
* Rights Reserved.
*
* Contributor(s):
* Scott Collins <scc@mozilla.org> (original author)
*/
#ifndef nsLiteralString_h___
#define nsLiteralString_h___
#ifndef nscore_h___
#include "nscore.h"
#endif
#ifndef nsDependentString_h___
#include "nsDependentString.h"
#endif
#if 0
inline
const nsDependentString
literal_string( const nsAString::char_type* aPtr )
{
return nsDependentString(aPtr);
}
inline
const nsDependentString
literal_string( const nsAString::char_type* aPtr, PRUint32 aLength )
{
return nsDependentString(aPtr, aLength);
}
inline
const nsDependentCString
literal_string( const nsACString::char_type* aPtr )
{
return nsDependentCString(aPtr);
}
inline
const nsDependentCString
literal_string( const nsACString::char_type* aPtr, PRUint32 aLength )
{
return nsDependentCString(aPtr, aLength);
}
#endif
#ifdef HAVE_CPP_2BYTE_WCHAR_T
#define NS_LL(s) L##s
#define NS_MULTILINE_LITERAL_STRING(s) nsDependentString(NS_REINTERPRET_CAST(const nsAString::char_type*, s), PRUint32((sizeof(s)/sizeof(wchar_t))-1))
#define NS_NAMED_MULTILINE_LITERAL_STRING(n,s) nsDependentString n(NS_REINTERPRET_CAST(const nsAString::char_type*, s), PRUint32((sizeof(s)/sizeof(wchar_t))-1))
#else
#define NS_LL(s) s
#define NS_MULTILINE_LITERAL_STRING(s) NS_ConvertASCIItoUCS2(s, PRUint32(sizeof(s)-1))
#define NS_NAMED_MULTILINE_LITERAL_STRING(n,s) NS_ConvertASCIItoUCS2 n(s, PRUint32(sizeof(s)-1))
#endif
/*
* Macro arguments used in concatenation or stringification won't be expanded.
* Therefore, in order for |NS_L(FOO)| to work as expected (which is to expand
* |FOO| before doing whatever |NS_L| needs to do to it) a helper macro needs
* to be inserted in between to allow the macro argument to expand.
* See "3.10.6 Separate Expansion of Macro Arguments" of the CPP manual for a
* more accurate and precise explanation.
*/
#define NS_L(s) NS_LL(s)
#define NS_LITERAL_STRING(s) NS_STATIC_CAST(const nsAFlatString&, NS_MULTILINE_LITERAL_STRING(NS_LL(s)))
#define NS_NAMED_LITERAL_STRING(n,s) NS_NAMED_MULTILINE_LITERAL_STRING(n, NS_LL(s))
#define NS_LITERAL_CSTRING(s) nsDependentCString(s, PRUint32(sizeof(s)-1))
#define NS_NAMED_LITERAL_CSTRING(n,s) nsDependentCString n(s, PRUint32(sizeof(s)-1))
#endif /* !defined(nsLiteralString_h___) */