1/*
2 * Copyright (C) 2010, 2013 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "Language.h"
28
29#include <wtf/HashMap.h>
30#include <wtf/RetainPtr.h>
31#include <wtf/text/WTFString.h>
32
33#if USE(CF) && !PLATFORM(WIN)
34#include <CoreFoundation/CoreFoundation.h>
35#endif
36
37namespace WebCore {
38
39typedef HashMap<void*, LanguageChangeObserverFunction> ObserverMap;
40static ObserverMap& observerMap()
41{
42    DEPRECATED_DEFINE_STATIC_LOCAL(ObserverMap, map, ());
43    return map;
44}
45
46void addLanguageChangeObserver(void* context, LanguageChangeObserverFunction customObserver)
47{
48    observerMap().set(context, customObserver);
49}
50
51void removeLanguageChangeObserver(void* context)
52{
53    ASSERT(observerMap().contains(context));
54    observerMap().remove(context);
55}
56
57void languageDidChange()
58{
59    ObserverMap::iterator end = observerMap().end();
60    for (ObserverMap::iterator iter = observerMap().begin(); iter != end; ++iter)
61        iter->value(iter->key);
62}
63
64String defaultLanguage()
65{
66    Vector<String> languages = userPreferredLanguages();
67    if (languages.size())
68        return languages[0];
69
70    return emptyString();
71}
72
73static Vector<String>& preferredLanguagesOverride()
74{
75    DEPRECATED_DEFINE_STATIC_LOCAL(Vector<String>, override, ());
76    return override;
77}
78
79Vector<String> userPreferredLanguagesOverride()
80{
81    return preferredLanguagesOverride();
82}
83
84void overrideUserPreferredLanguages(const Vector<String>& override)
85{
86    preferredLanguagesOverride() = override;
87}
88
89Vector<String> userPreferredLanguages()
90{
91    Vector<String>& override = preferredLanguagesOverride();
92    if (!override.isEmpty())
93        return override;
94
95    return platformUserPreferredLanguages();
96}
97
98static String canonicalLanguageIdentifier(const String& languageCode)
99{
100    String lowercaseLanguageCode = languageCode.lower();
101
102    if (lowercaseLanguageCode.length() >= 3 && lowercaseLanguageCode[2] == '_')
103        lowercaseLanguageCode.replace(2, 1, "-");
104
105    return lowercaseLanguageCode;
106}
107
108size_t indexOfBestMatchingLanguageInList(const String& language, const Vector<String>& languageList)
109{
110    String languageWithoutLocaleMatch;
111    String languageMatchButNotLocale;
112    size_t languageWithoutLocaleMatchIndex = 0;
113    size_t languageMatchButNotLocaleMatchIndex = 0;
114    bool canMatchLanguageOnly = (language.length() == 2 || (language.length() >= 3 && language[2] == '-'));
115
116    for (size_t i = 0; i < languageList.size(); ++i) {
117        String canonicalizedLanguageFromList = canonicalLanguageIdentifier(languageList[i]);
118
119        if (language == canonicalizedLanguageFromList)
120            return i;
121
122        if (canMatchLanguageOnly && canonicalizedLanguageFromList.length() >= 2) {
123            if (language[0] == canonicalizedLanguageFromList[0] && language[1] == canonicalizedLanguageFromList[1]) {
124                if (!languageWithoutLocaleMatch.length() && canonicalizedLanguageFromList.length() == 2) {
125                    languageWithoutLocaleMatch = languageList[i];
126                    languageWithoutLocaleMatchIndex = i;
127                }
128                if (!languageMatchButNotLocale.length() && canonicalizedLanguageFromList.length() >= 3) {
129                    languageMatchButNotLocale = languageList[i];
130                    languageMatchButNotLocaleMatchIndex = i;
131                }
132            }
133        }
134    }
135
136    // If we have both a language-only match and a languge-but-not-locale match, return the
137    // languge-only match as is considered a "better" match. For example, if the list
138    // provided has both "en-GB" and "en" and the user prefers "en-US" we will return "en".
139    if (languageWithoutLocaleMatch.length())
140        return languageWithoutLocaleMatchIndex;
141
142    if (languageMatchButNotLocale.length())
143        return languageMatchButNotLocaleMatchIndex;
144
145    return languageList.size();
146}
147
148String displayNameForLanguageLocale(const String& localeName)
149{
150#if USE(CF) && !PLATFORM(WIN)
151    if (!localeName.isEmpty())
152        return adoptCF(CFLocaleCopyDisplayNameForPropertyValue(adoptCF(CFLocaleCopyCurrent()).get(), kCFLocaleIdentifier, localeName.createCFString().get())).get();
153#endif
154    return localeName;
155}
156
157}
158