mirror of
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88 lines
3.6 KiB
C++
88 lines
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsLiteralString_h___
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#define nsLiteralString_h___
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#ifndef nscore_h___
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#include "nscore.h"
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#endif
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#ifndef nsDependentString_h___
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#include "nsDependentString.h"
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#endif
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namespace mozilla {
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namespace internal {
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// This is the same as sizeof(c) - 1, except it won't compile if c isn't a
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// string literal. This ensures that NS_LITERAL_CSTRING doesn't compile if you
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// pass it a char* (or something else for that matter).
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template<int n>
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inline uint32_t LiteralStringLength(const char (&c)[n])
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{
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return n - 1;
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}
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#if defined(HAVE_CPP_CHAR16_T)
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template<int n>
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inline uint32_t LiteralWStringLength(const char16_t (&c)[n])
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{
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return n - 1;
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}
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#elif defined(HAVE_CPP_2BYTE_WCHAR_T)
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template<int n>
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inline uint32_t LiteralWStringLength(const wchar_t (&c)[n])
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{
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return n - 1;
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}
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#endif
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} // namespace internal
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} // namespace mozilla
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#if defined(HAVE_CPP_CHAR16_T) || defined(HAVE_CPP_2BYTE_WCHAR_T)
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#if defined(HAVE_CPP_CHAR16_T)
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//PR_STATIC_ASSERT(sizeof(char16_t) == 2);
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#define NS_LL(s) u##s
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#else
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//PR_STATIC_ASSERT(sizeof(wchar_t) == 2);
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#define NS_LL(s) L##s
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#endif
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#define NS_MULTILINE_LITERAL_STRING(s) nsDependentString(reinterpret_cast<const nsAString::char_type*>(s), mozilla::internal::LiteralWStringLength(s))
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#define NS_MULTILINE_LITERAL_STRING_INIT(n,s) n(reinterpret_cast<const nsAString::char_type*>(s), mozilla::internal::LiteralWStringLength(s))
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#define NS_NAMED_MULTILINE_LITERAL_STRING(n,s) const nsDependentString n(reinterpret_cast<const nsAString::char_type*>(s), mozilla::internal::LiteralWStringLength(s))
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typedef nsDependentString nsLiteralString;
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#else
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#define NS_LL(s) s
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#define NS_MULTILINE_LITERAL_STRING(s) NS_ConvertASCIItoUTF16(s, mozilla::internal::LiteralStringLength(s))
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#define NS_MULTILINE_LITERAL_STRING_INIT(n,s) n(s, mozilla::internal::LiteralStringLength(s))
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#define NS_NAMED_MULTILINE_LITERAL_STRING(n,s) const NS_ConvertASCIItoUTF16 n(s, mozilla::internal::LiteralStringLength(s))
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typedef NS_ConvertASCIItoUTF16 nsLiteralString;
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#endif
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/*
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* Macro arguments used in concatenation or stringification won't be expanded.
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* Therefore, in order for |NS_L(FOO)| to work as expected (which is to expand
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* |FOO| before doing whatever |NS_L| needs to do to it) a helper macro needs
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* to be inserted in between to allow the macro argument to expand.
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* See "3.10.6 Separate Expansion of Macro Arguments" of the CPP manual for a
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* more accurate and precise explanation.
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*/
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#define NS_L(s) NS_LL(s)
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#define NS_LITERAL_STRING(s) static_cast<const nsAFlatString&>(NS_MULTILINE_LITERAL_STRING(NS_LL(s)))
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#define NS_LITERAL_STRING_INIT(n,s) NS_MULTILINE_LITERAL_STRING_INIT(n, NS_LL(s))
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#define NS_NAMED_LITERAL_STRING(n,s) NS_NAMED_MULTILINE_LITERAL_STRING(n, NS_LL(s))
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#define NS_LITERAL_CSTRING(s) static_cast<const nsDependentCString&>(nsDependentCString(s, mozilla::internal::LiteralStringLength(s)))
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#define NS_LITERAL_CSTRING_INIT(n,s) n(s, mozilla::internal::LiteralStringLength(s))
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#define NS_NAMED_LITERAL_CSTRING(n,s) const nsDependentCString n(s, mozilla::internal::LiteralStringLength(s))
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typedef nsDependentCString nsLiteralCString;
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#endif /* !defined(nsLiteralString_h___) */
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