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
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
/*
* Copyright (C) 2010, 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "platform/Language.h"
#include "public/platform/Platform.h"
#include "wtf/text/WTFString.h"
namespace blink {
static String canonicalizeLanguageIdentifier(const String& languageCode)
{
String copiedCode = languageCode;
// Platform::defaultLocale() might provide a language code with '_'.
copiedCode.replace('_', '-');
return copiedCode;
}
static const AtomicString& platformLanguage()
{
DEFINE_STATIC_LOCAL(AtomicString, computedDefaultLanguage, ());
if (computedDefaultLanguage.isEmpty()) {
computedDefaultLanguage = AtomicString(canonicalizeLanguageIdentifier(Platform::current()->defaultLocale()));
ASSERT(!computedDefaultLanguage.isEmpty());
}
return computedDefaultLanguage;
}
static Vector<AtomicString>& preferredLanguagesOverride()
{
DEFINE_STATIC_LOCAL(Vector<AtomicString>, override, ());
return override;
}
void overrideUserPreferredLanguages(const Vector<AtomicString>& override)
{
Vector<AtomicString>& canonicalized = preferredLanguagesOverride();
canonicalized.resize(0);
canonicalized.reserveCapacity(override.size());
for (const auto& lang : override)
canonicalized.append(canonicalizeLanguageIdentifier(lang));
}
AtomicString defaultLanguage()
{
Vector<AtomicString>& override = preferredLanguagesOverride();
if (!override.isEmpty())
return override[0];
return platformLanguage();
}
Vector<AtomicString> userPreferredLanguages()
{
Vector<AtomicString>& override = preferredLanguagesOverride();
if (!override.isEmpty())
return override;
Vector<AtomicString> languages;
languages.reserveInitialCapacity(1);
languages.append(platformLanguage());
return languages;
}
size_t indexOfBestMatchingLanguageInList(const AtomicString& language, const Vector<AtomicString>& languageList)
{
AtomicString languageWithoutLocaleMatch;
AtomicString languageMatchButNotLocale;
size_t languageWithoutLocaleMatchIndex = 0;
size_t languageMatchButNotLocaleMatchIndex = 0;
bool canMatchLanguageOnly = (language.length() == 2 || (language.length() >= 3 && language[2] == '-'));
for (size_t i = 0; i < languageList.size(); ++i) {
String canonicalizedLanguageFromList = canonicalizeLanguageIdentifier(languageList[i]);
if (language == canonicalizedLanguageFromList)
return i;
if (canMatchLanguageOnly && canonicalizedLanguageFromList.length() >= 2) {
if (language[0] == canonicalizedLanguageFromList[0] && language[1] == canonicalizedLanguageFromList[1]) {
if (!languageWithoutLocaleMatch.length() && canonicalizedLanguageFromList.length() == 2) {
languageWithoutLocaleMatch = languageList[i];
languageWithoutLocaleMatchIndex = i;
}
if (!languageMatchButNotLocale.length() && canonicalizedLanguageFromList.length() >= 3) {
languageMatchButNotLocale = languageList[i];
languageMatchButNotLocaleMatchIndex = i;
}
}
}
}
// If we have both a language-only match and a languge-but-not-locale match, return the
// languge-only match as is considered a "better" match. For example, if the list
// provided has both "en-GB" and "en" and the user prefers "en-US" we will return "en".
if (languageWithoutLocaleMatch.length())
return languageWithoutLocaleMatchIndex;
if (languageMatchButNotLocale.length())
return languageMatchButNotLocaleMatchIndex;
return languageList.size();
}
} // namespace blink
|
