/usr/include/thunderbird/mozilla/TextUtils.h is in thunderbird-dev 1:52.8.0-1~deb8u1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | /* -*- 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 */
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