Everywhere: Hoist the Libraries folder to the top-level

Author: https://github.com/trflynn89 Commit: 93712b24bf Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2256 Reviewed-by: https://github.com/sideshowbarker
2025-08-08 01:00:05 +00:00 · 2024-11-09 12:25:08 -05:00 · 2024-11-09 12:25:08 -05:00 · 93712b24bf · 2024-11-10 11:51:52 +00:00
commit 93712b24bf
parent 950e819ee7
4547 changed files with 104 additions and 113 deletions
--- a/Libraries/LibUnicode/Locale.cpp
+++ b/Libraries/LibUnicode/Locale.cpp
@ -0,0 +1,741 @@
+/*
+ * Copyright (c) 2021-2024, Tim Flynn <trflynn89@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/AllOf.h>
+#include <AK/GenericLexer.h>
+#include <AK/HashTable.h>
+#include <AK/QuickSort.h>
+#include <AK/StringBuilder.h>
+#include <LibUnicode/ICU.h>
+#include <LibUnicode/Locale.h>
+
+#include <unicode/localebuilder.h>
+#include <unicode/locid.h>
+
+namespace Unicode {
+
+static bool is_key(StringView key)
+{
+    // key = alphanum alpha
+    if (key.length() != 2)
+        return false;
+    return is_ascii_alphanumeric(key[0]) && is_ascii_alpha(key[1]);
+}
+
+static bool is_single_type(StringView type)
+{
+    // type = alphanum{3,8} (sep alphanum{3,8})*
+    // Note: Consecutive types are not handled here, that is left to the caller.
+    if ((type.length() < 3) || (type.length() > 8))
+        return false;
+    return all_of(type, is_ascii_alphanumeric);
+}
+
+static bool is_attribute(StringView type)
+{
+    // attribute = alphanum{3,8}
+    if ((type.length() < 3) || (type.length() > 8))
+        return false;
+    return all_of(type, is_ascii_alphanumeric);
+}
+
+static bool is_transformed_key(StringView key)
+{
+    // tkey = alpha digit
+    if (key.length() != 2)
+        return false;
+    return is_ascii_alpha(key[0]) && is_ascii_digit(key[1]);
+}
+
+static bool is_single_transformed_value(StringView value)
+{
+    // tvalue = (sep alphanum{3,8})+
+    // Note: Consecutive values are not handled here, that is left to the caller.
+    if ((value.length() < 3) || (value.length() > 8))
+        return false;
+    return all_of(value, is_ascii_alphanumeric);
+}
+
+static Optional<StringView> consume_next_segment(GenericLexer& lexer, bool with_separator = true)
+{
+    constexpr auto is_separator = is_any_of("-_"sv);
+
+    if (with_separator) {
+        if (!lexer.next_is(is_separator))
+            return {};
+        lexer.ignore();
+    }
+
+    auto segment = lexer.consume_until(is_separator);
+    if (segment.is_empty()) {
+        lexer.retreat(with_separator);
+        return {};
+    }
+
+    return segment;
+}
+
+bool is_type_identifier(StringView identifier)
+{
+    // type = alphanum{3,8} (sep alphanum{3,8})*
+    GenericLexer lexer { identifier };
+
+    while (true) {
+        auto type = consume_next_segment(lexer, lexer.tell() > 0);
+        if (!type.has_value())
+            break;
+        if (!is_single_type(*type))
+            return false;
+    }
+
+    return lexer.is_eof() && (lexer.tell() > 0);
+}
+
+static Optional<LanguageID> parse_unicode_language_id(GenericLexer& lexer)
+{
+    // https://unicode.org/reports/tr35/#Unicode_language_identifier
+    //
+    // unicode_language_id = "root"
+    //     OR
+    // unicode_language_id = ((unicode_language_subtag (sep unicode_script_subtag)?) | unicode_script_subtag)
+    //                       (sep unicode_region_subtag)?
+    //                       (sep unicode_variant_subtag)*
+    LanguageID language_id {};
+
+    if (lexer.consume_specific("root"sv)) {
+        language_id.is_root = true;
+        return language_id;
+    }
+
+    enum class ParseState {
+        ParsingLanguageOrScript,
+        ParsingScript,
+        ParsingRegion,
+        ParsingVariant,
+        Done,
+    };
+
+    auto state = ParseState::ParsingLanguageOrScript;
+
+    while (!lexer.is_eof() && (state != ParseState::Done)) {
+        auto segment = consume_next_segment(lexer, state != ParseState::ParsingLanguageOrScript);
+        if (!segment.has_value())
+            return {};
+
+        switch (state) {
+        case ParseState::ParsingLanguageOrScript:
+            if (is_unicode_language_subtag(*segment)) {
+                state = ParseState::ParsingScript;
+                language_id.language = MUST(String::from_utf8(*segment));
+            } else if (is_unicode_script_subtag(*segment)) {
+                state = ParseState::ParsingRegion;
+                language_id.script = MUST(String::from_utf8(*segment));
+            } else {
+                return {};
+            }
+            break;
+
+        case ParseState::ParsingScript:
+            if (is_unicode_script_subtag(*segment)) {
+                state = ParseState::ParsingRegion;
+                language_id.script = MUST(String::from_utf8(*segment));
+                break;
+            }
+
+            state = ParseState::ParsingRegion;
+            [[fallthrough]];
+
+        case ParseState::ParsingRegion:
+            if (is_unicode_region_subtag(*segment)) {
+                state = ParseState::ParsingVariant;
+                language_id.region = MUST(String::from_utf8(*segment));
+                break;
+            }
+
+            state = ParseState::ParsingVariant;
+            [[fallthrough]];
+
+        case ParseState::ParsingVariant:
+            if (is_unicode_variant_subtag(*segment)) {
+                language_id.variants.append(MUST(String::from_utf8(*segment)));
+            } else {
+                lexer.retreat(segment->length() + 1);
+                state = ParseState::Done;
+            }
+            break;
+
+        default:
+            VERIFY_NOT_REACHED();
+        }
+    }
+
+    return language_id;
+}
+
+static Optional<LocaleExtension> parse_unicode_locale_extension(GenericLexer& lexer)
+{
+    // https://unicode.org/reports/tr35/#unicode_locale_extensions
+    //
+    // unicode_locale_extensions = sep [uU] ((sep keyword)+ | (sep attribute)+ (sep keyword)*)
+    LocaleExtension locale_extension {};
+
+    enum class ParseState {
+        ParsingAttributeOrKeyword,
+        ParsingAttribute,
+        ParsingKeyword,
+        Done,
+    };
+
+    auto state = ParseState::ParsingAttributeOrKeyword;
+
+    while (!lexer.is_eof() && (state != ParseState::Done)) {
+        auto segment = consume_next_segment(lexer);
+        if (!segment.has_value())
+            return {};
+
+        if (state == ParseState::ParsingAttributeOrKeyword)
+            state = is_key(*segment) ? ParseState::ParsingKeyword : ParseState::ParsingAttribute;
+
+        switch (state) {
+        case ParseState::ParsingAttribute:
+            if (is_attribute(*segment)) {
+                locale_extension.attributes.append(MUST(String::from_utf8(*segment)));
+                break;
+            }
+
+            state = ParseState::ParsingKeyword;
+            [[fallthrough]];
+
+        case ParseState::ParsingKeyword: {
+            // keyword = key (sep type)?
+            Keyword keyword { .key = MUST(String::from_utf8(*segment)) };
+            Vector<StringView> keyword_values;
+
+            if (!is_key(*segment)) {
+                lexer.retreat(segment->length() + 1);
+                state = ParseState::Done;
+                break;
+            }
+
+            while (true) {
+                auto type = consume_next_segment(lexer);
+
+                if (!type.has_value() || !is_single_type(*type)) {
+                    if (type.has_value())
+                        lexer.retreat(type->length() + 1);
+                    break;
+                }
+
+                keyword_values.append(*type);
+            }
+
+            StringBuilder builder;
+            builder.join('-', keyword_values);
+            keyword.value = MUST(builder.to_string());
+
+            locale_extension.keywords.append(move(keyword));
+            break;
+        }
+
+        default:
+            VERIFY_NOT_REACHED();
+        }
+    }
+
+    if (locale_extension.attributes.is_empty() && locale_extension.keywords.is_empty())
+        return {};
+    return locale_extension;
+}
+
+static Optional<TransformedExtension> parse_transformed_extension(GenericLexer& lexer)
+{
+    // https://unicode.org/reports/tr35/#transformed_extensions
+    //
+    // transformed_extensions = sep [tT] ((sep tlang (sep tfield)*) | (sep tfield)+)
+    TransformedExtension transformed_extension {};
+
+    enum class ParseState {
+        ParsingLanguageOrField,
+        ParsingLanguage,
+        ParsingField,
+        Done,
+    };
+
+    auto state = ParseState::ParsingLanguageOrField;
+
+    while (!lexer.is_eof() && (state != ParseState::Done)) {
+        auto segment = consume_next_segment(lexer);
+        if (!segment.has_value())
+            return {};
+
+        if (state == ParseState::ParsingLanguageOrField)
+            state = is_unicode_language_subtag(*segment) ? ParseState::ParsingLanguage : ParseState::ParsingField;
+
+        switch (state) {
+        case ParseState::ParsingLanguage:
+            lexer.retreat(segment->length());
+
+            if (auto language_id = parse_unicode_language_id(lexer); language_id.has_value()) {
+                transformed_extension.language = language_id.release_value();
+                state = ParseState::ParsingField;
+                break;
+            }
+
+            return {};
+
+        case ParseState::ParsingField: {
+            // tfield = tkey tvalue;
+            TransformedField field { .key = MUST(String::from_utf8(*segment)) };
+            Vector<StringView> field_values;
+
+            if (!is_transformed_key(*segment)) {
+                lexer.retreat(segment->length() + 1);
+                state = ParseState::Done;
+                break;
+            }
+
+            while (true) {
+                auto value = consume_next_segment(lexer);
+
+                if (!value.has_value() || !is_single_transformed_value(*value)) {
+                    if (value.has_value())
+                        lexer.retreat(value->length() + 1);
+                    break;
+                }
+
+                field_values.append(*value);
+            }
+
+            if (field_values.is_empty())
+                return {};
+
+            StringBuilder builder;
+            builder.join('-', field_values);
+            field.value = MUST(builder.to_string());
+
+            transformed_extension.fields.append(move(field));
+            break;
+        }
+
+        default:
+            VERIFY_NOT_REACHED();
+        }
+    }
+
+    if (!transformed_extension.language.has_value() && transformed_extension.fields.is_empty())
+        return {};
+    return transformed_extension;
+}
+
+static Optional<OtherExtension> parse_other_extension(char key, GenericLexer& lexer)
+{
+    // https://unicode.org/reports/tr35/#other_extensions
+    //
+    // other_extensions = sep [alphanum-[tTuUxX]] (sep alphanum{2,8})+ ;
+    OtherExtension other_extension { .key = key };
+    Vector<StringView> other_values;
+
+    if (!is_ascii_alphanumeric(key) || (key == 'x') || (key == 'X'))
+        return {};
+
+    while (true) {
+        auto segment = consume_next_segment(lexer);
+        if (!segment.has_value())
+            break;
+
+        if ((segment->length() < 2) || (segment->length() > 8) || !all_of(*segment, is_ascii_alphanumeric)) {
+            lexer.retreat(segment->length() + 1);
+            break;
+        }
+
+        other_values.append(*segment);
+    }
+
+    if (other_values.is_empty())
+        return {};
+
+    StringBuilder builder;
+    builder.join('-', other_values);
+    other_extension.value = MUST(builder.to_string());
+
+    return other_extension;
+}
+
+static Optional<Extension> parse_extension(GenericLexer& lexer)
+{
+    // https://unicode.org/reports/tr35/#extensions
+    //
+    // extensions = unicode_locale_extensions | transformed_extensions | other_extensions
+    size_t starting_position = lexer.tell();
+
+    if (auto header = consume_next_segment(lexer); header.has_value() && (header->length() == 1)) {
+        switch (char key = (*header)[0]) {
+        case 'u':
+        case 'U':
+            if (auto extension = parse_unicode_locale_extension(lexer); extension.has_value())
+                return Extension { extension.release_value() };
+            break;
+
+        case 't':
+        case 'T':
+            if (auto extension = parse_transformed_extension(lexer); extension.has_value())
+                return Extension { extension.release_value() };
+            break;
+
+        default:
+            if (auto extension = parse_other_extension(key, lexer); extension.has_value())
+                return Extension { extension.release_value() };
+            break;
+        }
+    }
+
+    lexer.retreat(lexer.tell() - starting_position);
+    return {};
+}
+
+static Vector<String> parse_private_use_extensions(GenericLexer& lexer)
+{
+    // https://unicode.org/reports/tr35/#pu_extensions
+    //
+    // pu_extensions = = sep [xX] (sep alphanum{1,8})+ ;
+    size_t starting_position = lexer.tell();
+
+    auto header = consume_next_segment(lexer);
+    if (!header.has_value())
+        return {};
+
+    auto parse_values = [&]() {
+        Vector<String> extensions;
+
+        while (true) {
+            auto segment = consume_next_segment(lexer);
+            if (!segment.has_value())
+                break;
+
+            if ((segment->length() < 1) || (segment->length() > 8) || !all_of(*segment, is_ascii_alphanumeric)) {
+                lexer.retreat(segment->length() + 1);
+                break;
+            }
+
+            extensions.append(MUST(String::from_utf8(*segment)));
+        }
+
+        return extensions;
+    };
+
+    if ((header->length() == 1) && (((*header)[0] == 'x') || ((*header)[0] == 'X'))) {
+        if (auto extensions = parse_values(); !extensions.is_empty())
+            return extensions;
+    }
+
+    lexer.retreat(lexer.tell() - starting_position);
+    return {};
+}
+
+Optional<LanguageID> parse_unicode_language_id(StringView language)
+{
+    GenericLexer lexer { language };
+
+    auto language_id = parse_unicode_language_id(lexer);
+    if (!lexer.is_eof())
+        return {};
+
+    return language_id;
+}
+
+Optional<LocaleID> parse_unicode_locale_id(StringView locale)
+{
+    GenericLexer lexer { locale };
+
+    // https://unicode.org/reports/tr35/#Unicode_locale_identifier
+    //
+    // unicode_locale_id = unicode_language_id
+    //                     extensions*
+    //                     pu_extensions?
+    auto language_id = parse_unicode_language_id(lexer);
+    if (!language_id.has_value())
+        return {};
+
+    LocaleID locale_id { language_id.release_value() };
+
+    while (true) {
+        auto extension = parse_extension(lexer);
+        if (!extension.has_value())
+            break;
+        locale_id.extensions.append(extension.release_value());
+    }
+
+    locale_id.private_use_extensions = parse_private_use_extensions(lexer);
+
+    if (!lexer.is_eof())
+        return {};
+
+    return locale_id;
+}
+
+String canonicalize_unicode_locale_id(StringView locale)
+{
+    UErrorCode status = U_ZERO_ERROR;
+
+    auto locale_data = LocaleData::for_locale(locale);
+    VERIFY(locale_data.has_value());
+
+    locale_data->locale().canonicalize(status);
+    VERIFY(icu_success(status));
+
+    return locale_data->to_string();
+}
+
+String canonicalize_unicode_extension_values(StringView key, StringView value)
+{
+    UErrorCode status = U_ZERO_ERROR;
+
+    icu::LocaleBuilder builder;
+    builder.setUnicodeLocaleKeyword(icu_string_piece(key), icu_string_piece(value));
+
+    auto locale = builder.build(status);
+    VERIFY(icu_success(status));
+
+    locale.canonicalize(status);
+    VERIFY(icu_success(status));
+
+    auto result = locale.getUnicodeKeywordValue<StringBuilder>(icu_string_piece(key), status);
+    VERIFY(icu_success(status));
+
+    return MUST(result.to_string());
+}
+
+StringView default_locale()
+{
+    return "en"sv;
+}
+
+static void define_locales_without_scripts(HashTable<String>& locales)
+{
+    // https://tc39.es/ecma402/#sec-internal-slots
+    // For locales that include a script subtag in addition to language and region, the corresponding locale without a
+    // script subtag must also be supported.
+
+    HashTable<String> new_locales;
+
+    auto append_locale_without_script = [&](auto const& locale) {
+        auto parsed_locale = parse_unicode_language_id(locale);
+        if (!parsed_locale.has_value())
+            return;
+        if (!parsed_locale->language.has_value() || !parsed_locale->script.has_value() || !parsed_locale->region.has_value())
+            return;
+
+        auto locale_without_script = MUST(String::formatted("{}-{}", *parsed_locale->language, *parsed_locale->region));
+        new_locales.set(move(locale_without_script));
+    };
+
+    for (auto const& locale : locales)
+        append_locale_without_script(locale);
+
+    for (auto const& new_locale : new_locales)
+        locales.set(new_locale);
+}
+
+bool is_locale_available(StringView locale)
+{
+    static auto available_locales = []() {
+        i32 count = 0;
+        auto const* locale_list = icu::Locale::getAvailableLocales(count);
+
+        HashTable<String> available_locales;
+        available_locales.ensure_capacity(static_cast<size_t>(count));
+
+        for (i32 i = 0; i < count; ++i) {
+            UErrorCode status = U_ZERO_ERROR;
+
+            auto locale_name = locale_list[i].toLanguageTag<StringBuilder>(status);
+            if (icu_failure(status))
+                continue;
+
+            available_locales.set(MUST(locale_name.to_string()));
+        }
+
+        define_locales_without_scripts(available_locales);
+        return available_locales;
+    }();
+
+    return available_locales.contains(locale);
+}
+
+Style style_from_string(StringView style)
+{
+    if (style == "narrow"sv)
+        return Style::Narrow;
+    if (style == "short"sv)
+        return Style::Short;
+    if (style == "long"sv)
+        return Style::Long;
+    VERIFY_NOT_REACHED();
+}
+
+StringView style_to_string(Style style)
+{
+    switch (style) {
+    case Style::Narrow:
+        return "narrow"sv;
+    case Style::Short:
+        return "short"sv;
+    case Style::Long:
+        return "long"sv;
+    default:
+        VERIFY_NOT_REACHED();
+    }
+}
+
+static void apply_extensions_to_locale(icu::Locale& locale, icu::Locale const& locale_with_extensions)
+{
+    UErrorCode status = U_ZERO_ERROR;
+
+    icu::LocaleBuilder builder;
+    builder.setLocale(locale_with_extensions);
+    builder.setLanguage(locale.getLanguage());
+    builder.setRegion(locale.getCountry());
+    builder.setScript(locale.getScript());
+    builder.setVariant(locale.getVariant());
+
+    locale = builder.build(status);
+    VERIFY(icu_success(status));
+}
+
+Optional<String> add_likely_subtags(StringView locale)
+{
+    UErrorCode status = U_ZERO_ERROR;
+
+    auto locale_data = LocaleData::for_locale(locale);
+    if (!locale_data.has_value())
+        return {};
+
+    // ICU doesn't seem to handle maximizing locales that have keywords. For example, "und-x-private" should become
+    // "en-Latn-US-x-private" (in the same manner that "und" becomes "en-Latn-US"). So here, we maximize the locale
+    // without keywords, then add them back if needed.
+    auto maximized = icu::Locale::createFromName(locale_data->locale().getBaseName());
+
+    maximized.addLikelySubtags(status);
+    if (icu_failure(status))
+        return {};
+
+    if (strlen(locale_data->locale().getName()) != strlen(locale_data->locale().getBaseName()))
+        apply_extensions_to_locale(maximized, locale_data->locale());
+
+    auto result = maximized.toLanguageTag<StringBuilder>(status);
+    if (icu_failure(status))
+        return {};
+
+    return MUST(result.to_string());
+}
+
+Optional<String> remove_likely_subtags(StringView locale)
+{
+    UErrorCode status = U_ZERO_ERROR;
+
+    auto locale_data = LocaleData::for_locale(locale);
+    if (!locale_data.has_value())
+        return {};
+
+    // ICU doesn't seem to handle minimizing locales that have keywords. For example, "und-x-private" should become
+    // "en-x-private" (in the same manner that "und" becomes "en"). So here, we minimize the locale without keywords,
+    // then add them back if needed.
+    auto minimized = icu::Locale::createFromName(locale_data->locale().getBaseName());
+
+    minimized.minimizeSubtags(status);
+    if (icu_failure(status))
+        return {};
+
+    if (strlen(locale_data->locale().getName()) != strlen(locale_data->locale().getBaseName()))
+        apply_extensions_to_locale(minimized, locale_data->locale());
+
+    auto result = minimized.toLanguageTag<StringBuilder>(status);
+    if (icu_failure(status))
+        return {};
+
+    return MUST(result.to_string());
+}
+
+bool is_locale_character_ordering_right_to_left(StringView locale)
+{
+    auto locale_data = LocaleData::for_locale(locale);
+    if (!locale_data.has_value())
+        return false; // Default to left-to-right
+
+    return static_cast<bool>(locale_data->locale().isRightToLeft());
+}
+
+String LanguageID::to_string() const
+{
+    StringBuilder builder;
+
+    auto append_segment = [&](Optional<String> const& segment) {
+        if (!segment.has_value())
+            return;
+        if (!builder.is_empty())
+            builder.append('-');
+        builder.append(*segment);
+    };
+
+    append_segment(language);
+    append_segment(script);
+    append_segment(region);
+    for (auto const& variant : variants)
+        append_segment(variant);
+
+    return MUST(builder.to_string());
+}
+
+String LocaleID::to_string() const
+{
+    StringBuilder builder;
+
+    auto append_segment = [&](auto const& segment) {
+        if (segment.is_empty())
+            return;
+        if (!builder.is_empty())
+            builder.append('-');
+        builder.append(segment);
+    };
+
+    append_segment(language_id.to_string());
+
+    for (auto const& extension : extensions) {
+        extension.visit(
+            [&](LocaleExtension const& ext) {
+                builder.append("-u"sv);
+                for (auto const& attribute : ext.attributes)
+                    append_segment(attribute);
+                for (auto const& keyword : ext.keywords) {
+                    append_segment(keyword.key);
+                    append_segment(keyword.value);
+                }
+            },
+            [&](TransformedExtension const& ext) {
+                builder.append("-t"sv);
+                if (ext.language.has_value())
+                    append_segment(ext.language->to_string());
+                for (auto const& field : ext.fields) {
+                    append_segment(field.key);
+                    append_segment(field.value);
+                }
+            },
+            [&](OtherExtension const& ext) {
+                builder.appendff("-{}", ext.key);
+                append_segment(ext.value);
+            });
+    }
+
+    if (!private_use_extensions.is_empty()) {
+        builder.append("-x"sv);
+        for (auto const& extension : private_use_extensions)
+            append_segment(extension);
+    }
+
+    return MUST(builder.to_string());
+}
+
+}