blob: 84889b5ef493f0ab4e675ebcceaf52c164649100 (
plain)
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
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 */
|
