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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /intl/locale/nsLanguageAtomService.cpp | |
parent | Initial commit. (diff) | |
download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'intl/locale/nsLanguageAtomService.cpp')
-rw-r--r-- | intl/locale/nsLanguageAtomService.cpp | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/intl/locale/nsLanguageAtomService.cpp b/intl/locale/nsLanguageAtomService.cpp new file mode 100644 index 0000000000..4a9d9b92d2 --- /dev/null +++ b/intl/locale/nsLanguageAtomService.cpp @@ -0,0 +1,255 @@ +/* -*- Mode: C++; tab-width: 2; 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/. */ + +#include "nsLanguageAtomService.h" +#include "nsUConvPropertySearch.h" +#include "nsUnicharUtils.h" +#include "nsAtom.h" +#include "nsGkAtoms.h" +#include "mozilla/ArrayUtils.h" +#include "mozilla/ClearOnShutdown.h" +#include "mozilla/Encoding.h" +#include "mozilla/intl/Locale.h" +#include "mozilla/intl/OSPreferences.h" +#include "mozilla/ServoBindings.h" +#include "mozilla/ServoUtils.h" + +using namespace mozilla; +using mozilla::intl::OSPreferences; + +static constexpr nsUConvProp encodingsGroups[] = { +#include "encodingsgroups.properties.h" +}; + +// List of mozilla internal x-* tags that map to themselves (see bug 256257) +static constexpr nsStaticAtom* kLangGroups[] = { + // This list must be sorted! + nsGkAtoms::x_armn, nsGkAtoms::x_cyrillic, nsGkAtoms::x_devanagari, + nsGkAtoms::x_geor, nsGkAtoms::x_math, nsGkAtoms::x_tamil, + nsGkAtoms::Unicode, nsGkAtoms::x_western + // These self-mappings are not necessary unless somebody use them to specify + // lang in (X)HTML/XML documents, which they shouldn't. (see bug 256257) + // x-beng=x-beng + // x-cans=x-cans + // x-ethi=x-ethi + // x-guru=x-guru + // x-gujr=x-gujr + // x-khmr=x-khmr + // x-mlym=x-mlym +}; + +// Map ISO 15924 script codes from BCP47 lang tag to mozilla's langGroups. +static constexpr struct { + const char* mTag; + nsStaticAtom* mAtom; +} kScriptLangGroup[] = { + // This list must be sorted by script code! + {"Arab", nsGkAtoms::ar}, + {"Armn", nsGkAtoms::x_armn}, + {"Beng", nsGkAtoms::x_beng}, + {"Cans", nsGkAtoms::x_cans}, + {"Cyrl", nsGkAtoms::x_cyrillic}, + {"Deva", nsGkAtoms::x_devanagari}, + {"Ethi", nsGkAtoms::x_ethi}, + {"Geok", nsGkAtoms::x_geor}, + {"Geor", nsGkAtoms::x_geor}, + {"Grek", nsGkAtoms::el}, + {"Gujr", nsGkAtoms::x_gujr}, + {"Guru", nsGkAtoms::x_guru}, + {"Hang", nsGkAtoms::ko}, + // Hani is not mapped to a specific langGroup, we prefer to look at the + // primary language subtag in this case + {"Hans", nsGkAtoms::Chinese}, + // Hant is special-cased in code + // Hant=zh-HK + // Hant=zh-TW + {"Hebr", nsGkAtoms::he}, + {"Hira", nsGkAtoms::Japanese}, + {"Jpan", nsGkAtoms::Japanese}, + {"Kana", nsGkAtoms::Japanese}, + {"Khmr", nsGkAtoms::x_khmr}, + {"Knda", nsGkAtoms::x_knda}, + {"Kore", nsGkAtoms::ko}, + {"Latn", nsGkAtoms::x_western}, + {"Mlym", nsGkAtoms::x_mlym}, + {"Orya", nsGkAtoms::x_orya}, + {"Sinh", nsGkAtoms::x_sinh}, + {"Taml", nsGkAtoms::x_tamil}, + {"Telu", nsGkAtoms::x_telu}, + {"Thai", nsGkAtoms::th}, + {"Tibt", nsGkAtoms::x_tibt}}; + +static UniquePtr<nsLanguageAtomService> gLangAtomService; + +// static +nsLanguageAtomService* nsLanguageAtomService::GetService() { + if (!gLangAtomService) { + gLangAtomService = MakeUnique<nsLanguageAtomService>(); + } + return gLangAtomService.get(); +} + +// static +void nsLanguageAtomService::Shutdown() { gLangAtomService = nullptr; } + +nsStaticAtom* nsLanguageAtomService::LookupLanguage( + const nsACString& aLanguage) { + nsAutoCString lowered(aLanguage); + ToLowerCase(lowered); + + RefPtr<nsAtom> lang = NS_Atomize(lowered); + return GetLanguageGroup(lang); +} + +already_AddRefed<nsAtom> nsLanguageAtomService::LookupCharSet( + NotNull<const Encoding*> aEncoding) { + nsAutoCString charset; + aEncoding->Name(charset); + nsAutoCString group; + if (NS_FAILED(nsUConvPropertySearch::SearchPropertyValue( + encodingsGroups, ArrayLength(encodingsGroups), charset, group))) { + return RefPtr<nsAtom>(nsGkAtoms::Unicode).forget(); + } + return NS_Atomize(group); +} + +nsAtom* nsLanguageAtomService::GetLocaleLanguage() { + do { + if (!mLocaleLanguage) { + AutoTArray<nsCString, 10> regionalPrefsLocales; + if (NS_SUCCEEDED(OSPreferences::GetInstance()->GetRegionalPrefsLocales( + regionalPrefsLocales))) { + // use lowercase for all language atoms + ToLowerCase(regionalPrefsLocales[0]); + mLocaleLanguage = NS_Atomize(regionalPrefsLocales[0]); + } else { + nsAutoCString locale; + OSPreferences::GetInstance()->GetSystemLocale(locale); + + ToLowerCase(locale); // use lowercase for all language atoms + mLocaleLanguage = NS_Atomize(locale); + } + } + } while (0); + + return mLocaleLanguage; +} + +nsStaticAtom* nsLanguageAtomService::GetLanguageGroup(nsAtom* aLanguage, + bool* aNeedsToCache) { + if (aNeedsToCache) { + if (nsStaticAtom* atom = mLangToGroup.Get(aLanguage)) { + return atom; + } + *aNeedsToCache = true; + return nullptr; + } + + return mLangToGroup.LookupOrInsertWith(aLanguage, [&] { + AssertIsMainThreadOrServoFontMetricsLocked(); + return GetUncachedLanguageGroup(aLanguage); + }); +} + +nsStaticAtom* nsLanguageAtomService::GetUncachedLanguageGroup( + nsAtom* aLanguage) const { + nsAutoCString langStr; + aLanguage->ToUTF8String(langStr); + ToLowerCase(langStr); + + if (langStr[0] == 'x' && langStr[1] == '-') { + // Internal x-* langGroup codes map to themselves (see bug 256257) + for (nsStaticAtom* langGroup : kLangGroups) { + if (langGroup == aLanguage) { + return langGroup; + } + if (aLanguage->IsAsciiLowercase()) { + continue; + } + // Do the slow ascii-case-insensitive comparison just if needed. + nsDependentAtomString string(langGroup); + if (string.EqualsASCII(langStr.get(), langStr.Length())) { + return langGroup; + } + } + } else { + // If the lang code can be parsed as BCP47, look up its (likely) script. + + // https://bugzilla.mozilla.org/show_bug.cgi?id=1618034: + // First strip any private subtags that would cause Locale to reject the + // tag as non-wellformed. + nsACString::const_iterator start, end; + langStr.BeginReading(start); + langStr.EndReading(end); + if (FindInReadable("-x-"_ns, start, end)) { + // The substring we want ends at the beginning of the "-x-" subtag. + langStr.Truncate(start.get() - langStr.BeginReading()); + } + + intl::Locale loc; + auto result = intl::LocaleParser::TryParse(langStr, loc); + if (!result.isOk()) { + // Did the author (wrongly) use '_' instead of '-' to separate subtags? + // If so, fix it up and re-try parsing. + if (langStr.Contains('_')) { + langStr.ReplaceChar('_', '-'); + + // Throw away the partially parsed locale and re-start parsing. + loc = {}; + result = intl::LocaleParser::TryParse(langStr, loc); + } + } + if (result.isOk() && loc.Canonicalize().isOk()) { + // Fill in script subtag if not present. + if (loc.Script().Missing()) { + if (loc.AddLikelySubtags().isErr()) { + // Fall back to x-unicode if no match was found + return nsGkAtoms::Unicode; + } + } + // Traditional Chinese has separate prefs for Hong Kong / Taiwan; + // check the region subtag. + if (loc.Script().EqualTo("Hant")) { + if (loc.Region().EqualTo("HK")) { + return nsGkAtoms::HongKongChinese; + } + return nsGkAtoms::Taiwanese; + } + // Search list of known script subtags that map to langGroup codes. + size_t foundIndex; + Span<const char> scriptAsSpan = loc.Script().Span(); + nsDependentCSubstring script(scriptAsSpan.data(), scriptAsSpan.size()); + if (BinarySearchIf( + kScriptLangGroup, 0, ArrayLength(kScriptLangGroup), + [script](const auto& entry) -> int { + return Compare(script, nsDependentCString(entry.mTag)); + }, + &foundIndex)) { + return kScriptLangGroup[foundIndex].mAtom; + } + // Script subtag was not recognized (includes "Hani"); check the language + // subtag for CJK possibilities so that we'll prefer the appropriate font + // rather than falling back to the browser's hardcoded preference. + if (loc.Language().EqualTo("zh")) { + if (loc.Region().EqualTo("HK")) { + return nsGkAtoms::HongKongChinese; + } + if (loc.Region().EqualTo("TW")) { + return nsGkAtoms::Taiwanese; + } + return nsGkAtoms::Chinese; + } + if (loc.Language().EqualTo("ja")) { + return nsGkAtoms::Japanese; + } + if (loc.Language().EqualTo("ko")) { + return nsGkAtoms::ko; + } + } + } + + // Fall back to x-unicode if no match was found + return nsGkAtoms::Unicode; +} |