зеркало из https://github.com/mozilla/gecko-dev.git
57 строки
1.2 KiB
C++
57 строки
1.2 KiB
C++
/* -*- 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;
|
|
auto uc = static_cast<UnsignedChar>(aChar);
|
|
return ('a' <= uc && uc <= 'z') || ('A' <= uc && uc <= 'Z');
|
|
}
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif /* mozilla_TextUtils_h */
|