/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set ts=8 sts=2 et sw=2 tw=80: */ /* 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/. */ /* Character/text operations. */ #ifndef mozilla_TextUtils_h #define mozilla_TextUtils_h #include "mozilla/TypeTraits.h" namespace mozilla { namespace detail { template<typename Char> class MakeUnsignedChar : public MakeUnsigned<Char> {}; template<> class MakeUnsignedChar<char16_t> { public: using Type = char16_t; }; template<> class MakeUnsignedChar<char32_t> { public: using Type = char32_t; }; } // namespace detail /** * Returns true iff |aChar| matches [a-zA-Z]. * * This function is basically what you thought isalpha was, except its behavior * doesn't depend on the user's current locale. */ template<typename Char> constexpr bool IsAsciiAlpha(Char aChar) { using UnsignedChar = typename detail::MakeUnsignedChar<Char>::Type; return ('a' <= static_cast<UnsignedChar>(aChar) && static_cast<UnsignedChar>(aChar) <= 'z') || ('A' <= static_cast<UnsignedChar>(aChar) && static_cast<UnsignedChar>(aChar) <= 'Z'); } } // namespace mozilla #endif /* mozilla_TextUtils_h */