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