| /* |
| * Copyright (C) 2018 Yusuke Suzuki <utatane.tea@gmail.com> |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #pragma once |
| |
| #include <wtf/ASCIICType.h> |
| #include <wtf/Forward.h> |
| #include <wtf/StdLibExtras.h> |
| |
| namespace WTF { |
| |
| class PrintStream; |
| |
| class ASCIILiteral final { |
| public: |
| operator const char*() const { return m_characters; } |
| |
| static constexpr ASCIILiteral fromLiteralUnsafe(const char* string) |
| { |
| return ASCIILiteral { string }; |
| } |
| |
| WTF_EXPORT_PRIVATE void dump(PrintStream& out) const; |
| |
| static constexpr ASCIILiteral null() |
| { |
| return ASCIILiteral { nullptr }; |
| } |
| |
| constexpr const char* characters() const { return m_characters; } |
| const LChar* characters8() const { return bitwise_cast<const LChar*>(m_characters); } |
| size_t length() const { return strlen(m_characters); } |
| |
| constexpr char characterAt(unsigned index) const { return m_characters[index]; } |
| |
| private: |
| constexpr explicit ASCIILiteral(const char* characters) : m_characters(characters) { } |
| |
| const char* m_characters; |
| }; |
| |
| inline namespace StringLiterals { |
| |
| constexpr ASCIILiteral operator"" _s(const char* characters, size_t n) |
| { |
| #if ASSERT_ENABLED |
| for (size_t i = 0; i < n; ++i) |
| ASSERT_UNDER_CONSTEXPR_CONTEXT(isASCII(characters[i])); |
| #else |
| UNUSED_PARAM(n); |
| #endif |
| return ASCIILiteral::fromLiteralUnsafe(characters); |
| } |
| |
| } // inline StringLiterals |
| |
| } // namespace WTF |
| |
| using namespace WTF::StringLiterals; |