gecko/xpcom/string/public/nsLiteralString.h
2012-05-21 12:12:37 +01:00

90 lines
3.4 KiB
C

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#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
#if defined(HAVE_CPP_CHAR16_T) || defined(HAVE_CPP_2BYTE_WCHAR_T)
#if defined(HAVE_CPP_CHAR16_T)
//PR_STATIC_ASSERT(sizeof(char16_t) == 2);
#define NS_LL(s) u##s
#else
//PR_STATIC_ASSERT(sizeof(wchar_t) == 2);
#define NS_LL(s) L##s
#endif
#define NS_MULTILINE_LITERAL_STRING(s) nsDependentString(reinterpret_cast<const nsAString::char_type*>(s), PRUint32((sizeof(s)/2)-1))
#define NS_MULTILINE_LITERAL_STRING_INIT(n,s) n(reinterpret_cast<const nsAString::char_type*>(s), PRUint32((sizeof(s)/2)-1))
#define NS_NAMED_MULTILINE_LITERAL_STRING(n,s) const nsDependentString n(reinterpret_cast<const nsAString::char_type*>(s), PRUint32((sizeof(s)/2)-1))
typedef nsDependentString nsLiteralString;
#else
#define NS_LL(s) s
#define NS_MULTILINE_LITERAL_STRING(s) NS_ConvertASCIItoUTF16(s, PRUint32(sizeof(s)-1))
#define NS_MULTILINE_LITERAL_STRING_INIT(n,s) n(s, PRUint32(sizeof(s)-1))
#define NS_NAMED_MULTILINE_LITERAL_STRING(n,s) const NS_ConvertASCIItoUTF16 n(s, PRUint32(sizeof(s)-1))
typedef NS_ConvertASCIItoUTF16 nsLiteralString;
#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) static_cast<const nsAFlatString&>(NS_MULTILINE_LITERAL_STRING(NS_LL(s)))
#define NS_LITERAL_STRING_INIT(n,s) NS_MULTILINE_LITERAL_STRING_INIT(n, NS_LL(s))
#define NS_NAMED_LITERAL_STRING(n,s) NS_NAMED_MULTILINE_LITERAL_STRING(n, NS_LL(s))
#define NS_LITERAL_CSTRING(s) static_cast<const nsDependentCString&>(nsDependentCString(s, PRUint32(sizeof(s)-1)))
#define NS_LITERAL_CSTRING_INIT(n,s) n(s, PRUint32(sizeof(s)-1))
#define NS_NAMED_LITERAL_CSTRING(n,s) const nsDependentCString n(s, PRUint32(sizeof(s)-1))
typedef nsDependentCString nsLiteralCString;
#endif /* !defined(nsLiteralString_h___) */