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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/language/core/common/language_util.h"
#include <stddef.h>
#include <algorithm>
#include <string_view>
#include "base/feature_list.h"
#include "base/strings/strcat.h"
#include "components/country_codes/country_codes.h"
#include "components/language/core/common/language_experiments.h"
#include "components/language/core/common/locale_util.h"
namespace language {
namespace {
struct LanguageCodePair {
// Code used in supporting list of Translate.
const char* const translate_language;
// Code used in Chrome internal.
const char* const chrome_language;
};
// Some languages are treated as same languages in Translate even though they
// are different to be exact.
//
// If this table is updated, please sync this with the synonym table in
// chrome/browser/resources/settings/languages_page/languages.ts.
const LanguageCodePair kTranslateOnlySynonyms[] = {
{"no", "nb"},
{"id", "in"},
};
// Some languages have changed codes over the years and sometimes the older
// codes are used, so we must see them as synonyms.
//
// If this table is updated, please sync this with the synonym table in
// chrome/browser/resources/settings/languages_page/languages.ts.
const LanguageCodePair kLanguageCodeSynonyms[] = {
{"gom", "kok"},
{"iw", "he"},
{"jw", "jv"},
{"tl", "fil"},
};
// Some Chinese language codes are compatible with zh-TW or zh-CN in terms of
// Translate.
//
// If this table is updated, please sync this with the synonym table in
// chrome/browser/resources/settings/languages_page/languages.ts.
const LanguageCodePair kLanguageCodeChineseCompatiblePairs[] = {
{"zh-TW", "zh-HK"},
{"zh-TW", "zh-MO"},
{"zh-CN", "zh-SG"},
};
} // namespace
bool OverrideTranslateTriggerInIndia() {
#if BUILDFLAG(IS_ANDROID)
if (base::FeatureList::IsEnabled(language::kDisableGeoLanguageModel)) {
return false;
}
return country_codes::GetCurrentCountryID().CountryCode() == "IN";
#else
return false;
#endif
}
OverrideLanguageModel GetOverrideLanguageModel() {
// Note: when there are multiple possible override models, the overrides
// ordering is important as it allows us to have concurrent overrides in
// experiment without having to partition them explicitly.
if (OverrideTranslateTriggerInIndia()) {
return OverrideLanguageModel::GEO;
}
return OverrideLanguageModel::DEFAULT;
}
void ToTranslateLanguageSynonym(std::string* language) {
// Get the base language (e.g. "es" for "es-MX")
auto [main_part, tail_part] = language::SplitIntoMainAndTail(*language);
if (main_part.empty()) {
return;
}
if (main_part == "mni") {
// "mni-Mtei" does not have any mapping and as such we leave it as is.
return;
}
if (main_part == "zh") {
// Chinese is a special case, there can be two base languages: traditional
// and simplified. The kLanguageCodeChineseCompatiblePairs list contains the
// relation between various Chinese locales. We need to return the code from
// that mapping - if it exists.
for (const auto& language_pair : kLanguageCodeChineseCompatiblePairs) {
if (*language == language_pair.chrome_language) {
*language = language_pair.translate_language;
return;
}
}
// Note that "zh" does not have any mapping and as such we leave it as is.
// See https://crbug/798512 for more info.
return;
}
if (main_part == "cmn") {
// The Speech On-Device API (SODA) uses the Mandarin Chinese (cmn) language
// codes.
if (tail_part.rfind("-hant", 0) == 0) {
*language = "zh-TW";
return;
}
if (tail_part.rfind("-hans", 0) == 0) {
*language = "zh-CN";
return;
}
// If there is no matching script tag for cmn return zh.
*language = "zh";
return;
}
for (const auto& language_pair : kTranslateOnlySynonyms) {
if (main_part == language_pair.chrome_language) {
*language = language_pair.translate_language;
return;
}
}
// Apply linear search here because number of items in the list is just three.
for (const auto& language_pair : kLanguageCodeSynonyms) {
if (main_part == language_pair.chrome_language) {
*language = language_pair.translate_language;
return;
}
}
// By default use the base language as the translate synonym.
*language = std::string(main_part);
}
void ToChromeLanguageSynonym(std::string* language) {
auto [main_part, tail_part] = language::SplitIntoMainAndTail(*language);
if (main_part.empty()) {
return;
}
// Apply linear search here because number of items in the list is just three.
for (const auto& language_pair : kLanguageCodeSynonyms) {
if (main_part == language_pair.translate_language) {
main_part = language_pair.chrome_language;
break;
}
}
*language = base::StrCat({main_part, tail_part});
}
} // namespace language
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