mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-22 15:40:19 +00:00
741 lines
22 KiB
C++
741 lines
22 KiB
C++
/*
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* Copyright (c) 2021-2024, Tim Flynn <trflynn89@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/AllOf.h>
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#include <AK/GenericLexer.h>
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#include <AK/HashTable.h>
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#include <AK/QuickSort.h>
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#include <AK/StringBuilder.h>
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#include <LibUnicode/ICU.h>
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#include <LibUnicode/Locale.h>
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#include <unicode/localebuilder.h>
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#include <unicode/locid.h>
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namespace Unicode {
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static bool is_key(StringView key)
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{
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// key = alphanum alpha
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if (key.length() != 2)
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return false;
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return is_ascii_alphanumeric(key[0]) && is_ascii_alpha(key[1]);
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}
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static bool is_single_type(StringView type)
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{
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// type = alphanum{3,8} (sep alphanum{3,8})*
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// Note: Consecutive types are not handled here, that is left to the caller.
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if ((type.length() < 3) || (type.length() > 8))
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return false;
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return all_of(type, is_ascii_alphanumeric);
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}
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static bool is_attribute(StringView type)
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{
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// attribute = alphanum{3,8}
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if ((type.length() < 3) || (type.length() > 8))
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return false;
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return all_of(type, is_ascii_alphanumeric);
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}
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static bool is_transformed_key(StringView key)
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{
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// tkey = alpha digit
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if (key.length() != 2)
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return false;
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return is_ascii_alpha(key[0]) && is_ascii_digit(key[1]);
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}
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static bool is_single_transformed_value(StringView value)
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{
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// tvalue = (sep alphanum{3,8})+
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// Note: Consecutive values are not handled here, that is left to the caller.
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if ((value.length() < 3) || (value.length() > 8))
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return false;
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return all_of(value, is_ascii_alphanumeric);
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}
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static Optional<StringView> consume_next_segment(GenericLexer& lexer, bool with_separator = true)
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{
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constexpr auto is_separator = is_any_of("-_"sv);
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if (with_separator) {
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if (!lexer.next_is(is_separator))
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return {};
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lexer.ignore();
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}
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auto segment = lexer.consume_until(is_separator);
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if (segment.is_empty()) {
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lexer.retreat(with_separator);
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return {};
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}
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return segment;
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}
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bool is_type_identifier(StringView identifier)
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{
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// type = alphanum{3,8} (sep alphanum{3,8})*
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GenericLexer lexer { identifier };
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while (true) {
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auto type = consume_next_segment(lexer, lexer.tell() > 0);
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if (!type.has_value())
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break;
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if (!is_single_type(*type))
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return false;
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}
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return lexer.is_eof() && (lexer.tell() > 0);
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}
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static Optional<LanguageID> parse_unicode_language_id(GenericLexer& lexer)
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{
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// https://unicode.org/reports/tr35/#Unicode_language_identifier
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//
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// unicode_language_id = "root"
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// OR
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// unicode_language_id = ((unicode_language_subtag (sep unicode_script_subtag)?) | unicode_script_subtag)
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// (sep unicode_region_subtag)?
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// (sep unicode_variant_subtag)*
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LanguageID language_id {};
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if (lexer.consume_specific("root"sv)) {
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language_id.is_root = true;
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return language_id;
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}
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enum class ParseState {
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ParsingLanguageOrScript,
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ParsingScript,
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ParsingRegion,
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ParsingVariant,
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Done,
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};
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auto state = ParseState::ParsingLanguageOrScript;
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while (!lexer.is_eof() && (state != ParseState::Done)) {
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auto segment = consume_next_segment(lexer, state != ParseState::ParsingLanguageOrScript);
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if (!segment.has_value())
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return {};
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switch (state) {
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case ParseState::ParsingLanguageOrScript:
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if (is_unicode_language_subtag(*segment)) {
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state = ParseState::ParsingScript;
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language_id.language = MUST(String::from_utf8(*segment));
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} else if (is_unicode_script_subtag(*segment)) {
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state = ParseState::ParsingRegion;
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language_id.script = MUST(String::from_utf8(*segment));
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} else {
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return {};
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}
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break;
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case ParseState::ParsingScript:
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if (is_unicode_script_subtag(*segment)) {
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state = ParseState::ParsingRegion;
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language_id.script = MUST(String::from_utf8(*segment));
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break;
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}
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state = ParseState::ParsingRegion;
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[[fallthrough]];
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case ParseState::ParsingRegion:
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if (is_unicode_region_subtag(*segment)) {
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state = ParseState::ParsingVariant;
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language_id.region = MUST(String::from_utf8(*segment));
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break;
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}
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state = ParseState::ParsingVariant;
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[[fallthrough]];
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case ParseState::ParsingVariant:
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if (is_unicode_variant_subtag(*segment)) {
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language_id.variants.append(MUST(String::from_utf8(*segment)));
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} else {
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lexer.retreat(segment->length() + 1);
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state = ParseState::Done;
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}
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break;
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default:
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VERIFY_NOT_REACHED();
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}
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}
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return language_id;
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}
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static Optional<LocaleExtension> parse_unicode_locale_extension(GenericLexer& lexer)
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{
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// https://unicode.org/reports/tr35/#unicode_locale_extensions
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//
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// unicode_locale_extensions = sep [uU] ((sep keyword)+ | (sep attribute)+ (sep keyword)*)
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LocaleExtension locale_extension {};
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enum class ParseState {
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ParsingAttributeOrKeyword,
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ParsingAttribute,
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ParsingKeyword,
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Done,
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};
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auto state = ParseState::ParsingAttributeOrKeyword;
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while (!lexer.is_eof() && (state != ParseState::Done)) {
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auto segment = consume_next_segment(lexer);
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if (!segment.has_value())
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return {};
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if (state == ParseState::ParsingAttributeOrKeyword)
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state = is_key(*segment) ? ParseState::ParsingKeyword : ParseState::ParsingAttribute;
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switch (state) {
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case ParseState::ParsingAttribute:
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if (is_attribute(*segment)) {
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locale_extension.attributes.append(MUST(String::from_utf8(*segment)));
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break;
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}
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state = ParseState::ParsingKeyword;
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[[fallthrough]];
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case ParseState::ParsingKeyword: {
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// keyword = key (sep type)?
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Keyword keyword { .key = MUST(String::from_utf8(*segment)) };
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Vector<StringView> keyword_values;
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if (!is_key(*segment)) {
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lexer.retreat(segment->length() + 1);
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state = ParseState::Done;
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break;
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}
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while (true) {
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auto type = consume_next_segment(lexer);
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if (!type.has_value() || !is_single_type(*type)) {
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if (type.has_value())
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lexer.retreat(type->length() + 1);
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break;
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}
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keyword_values.append(*type);
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}
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StringBuilder builder;
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builder.join('-', keyword_values);
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keyword.value = MUST(builder.to_string());
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locale_extension.keywords.append(move(keyword));
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break;
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}
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default:
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VERIFY_NOT_REACHED();
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}
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}
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if (locale_extension.attributes.is_empty() && locale_extension.keywords.is_empty())
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return {};
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return locale_extension;
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}
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static Optional<TransformedExtension> parse_transformed_extension(GenericLexer& lexer)
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{
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// https://unicode.org/reports/tr35/#transformed_extensions
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//
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// transformed_extensions = sep [tT] ((sep tlang (sep tfield)*) | (sep tfield)+)
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TransformedExtension transformed_extension {};
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enum class ParseState {
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ParsingLanguageOrField,
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ParsingLanguage,
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ParsingField,
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Done,
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};
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auto state = ParseState::ParsingLanguageOrField;
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while (!lexer.is_eof() && (state != ParseState::Done)) {
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auto segment = consume_next_segment(lexer);
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if (!segment.has_value())
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return {};
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if (state == ParseState::ParsingLanguageOrField)
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state = is_unicode_language_subtag(*segment) ? ParseState::ParsingLanguage : ParseState::ParsingField;
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switch (state) {
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case ParseState::ParsingLanguage:
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lexer.retreat(segment->length());
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if (auto language_id = parse_unicode_language_id(lexer); language_id.has_value()) {
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transformed_extension.language = language_id.release_value();
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state = ParseState::ParsingField;
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break;
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}
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return {};
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case ParseState::ParsingField: {
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// tfield = tkey tvalue;
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TransformedField field { .key = MUST(String::from_utf8(*segment)) };
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Vector<StringView> field_values;
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if (!is_transformed_key(*segment)) {
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lexer.retreat(segment->length() + 1);
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state = ParseState::Done;
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break;
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}
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while (true) {
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auto value = consume_next_segment(lexer);
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if (!value.has_value() || !is_single_transformed_value(*value)) {
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if (value.has_value())
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lexer.retreat(value->length() + 1);
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break;
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}
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field_values.append(*value);
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}
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if (field_values.is_empty())
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return {};
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StringBuilder builder;
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builder.join('-', field_values);
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field.value = MUST(builder.to_string());
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transformed_extension.fields.append(move(field));
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break;
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}
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default:
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VERIFY_NOT_REACHED();
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}
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}
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if (!transformed_extension.language.has_value() && transformed_extension.fields.is_empty())
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return {};
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return transformed_extension;
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}
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static Optional<OtherExtension> parse_other_extension(char key, GenericLexer& lexer)
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{
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// https://unicode.org/reports/tr35/#other_extensions
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//
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// other_extensions = sep [alphanum-[tTuUxX]] (sep alphanum{2,8})+ ;
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OtherExtension other_extension { .key = key };
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Vector<StringView> other_values;
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if (!is_ascii_alphanumeric(key) || (key == 'x') || (key == 'X'))
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return {};
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while (true) {
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auto segment = consume_next_segment(lexer);
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if (!segment.has_value())
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break;
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if ((segment->length() < 2) || (segment->length() > 8) || !all_of(*segment, is_ascii_alphanumeric)) {
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lexer.retreat(segment->length() + 1);
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break;
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}
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other_values.append(*segment);
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}
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if (other_values.is_empty())
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return {};
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StringBuilder builder;
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builder.join('-', other_values);
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other_extension.value = MUST(builder.to_string());
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return other_extension;
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}
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static Optional<Extension> parse_extension(GenericLexer& lexer)
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{
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// https://unicode.org/reports/tr35/#extensions
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//
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// extensions = unicode_locale_extensions | transformed_extensions | other_extensions
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size_t starting_position = lexer.tell();
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if (auto header = consume_next_segment(lexer); header.has_value() && (header->length() == 1)) {
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switch (char key = (*header)[0]) {
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case 'u':
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case 'U':
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if (auto extension = parse_unicode_locale_extension(lexer); extension.has_value())
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return Extension { extension.release_value() };
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break;
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case 't':
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case 'T':
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if (auto extension = parse_transformed_extension(lexer); extension.has_value())
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return Extension { extension.release_value() };
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break;
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default:
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if (auto extension = parse_other_extension(key, lexer); extension.has_value())
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return Extension { extension.release_value() };
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break;
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}
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}
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lexer.retreat(lexer.tell() - starting_position);
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return {};
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}
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static Vector<String> parse_private_use_extensions(GenericLexer& lexer)
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{
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// https://unicode.org/reports/tr35/#pu_extensions
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//
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// pu_extensions = = sep [xX] (sep alphanum{1,8})+ ;
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size_t starting_position = lexer.tell();
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auto header = consume_next_segment(lexer);
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if (!header.has_value())
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return {};
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auto parse_values = [&]() {
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Vector<String> extensions;
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while (true) {
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auto segment = consume_next_segment(lexer);
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if (!segment.has_value())
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break;
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if ((segment->length() < 1) || (segment->length() > 8) || !all_of(*segment, is_ascii_alphanumeric)) {
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lexer.retreat(segment->length() + 1);
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break;
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}
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extensions.append(MUST(String::from_utf8(*segment)));
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}
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return extensions;
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};
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if ((header->length() == 1) && (((*header)[0] == 'x') || ((*header)[0] == 'X'))) {
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if (auto extensions = parse_values(); !extensions.is_empty())
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return extensions;
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}
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lexer.retreat(lexer.tell() - starting_position);
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return {};
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}
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Optional<LanguageID> parse_unicode_language_id(StringView language)
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{
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GenericLexer lexer { language };
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auto language_id = parse_unicode_language_id(lexer);
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if (!lexer.is_eof())
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return {};
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return language_id;
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}
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Optional<LocaleID> parse_unicode_locale_id(StringView locale)
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{
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GenericLexer lexer { locale };
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// https://unicode.org/reports/tr35/#Unicode_locale_identifier
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//
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// unicode_locale_id = unicode_language_id
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// extensions*
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// pu_extensions?
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auto language_id = parse_unicode_language_id(lexer);
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if (!language_id.has_value())
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return {};
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LocaleID locale_id { language_id.release_value() };
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while (true) {
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auto extension = parse_extension(lexer);
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if (!extension.has_value())
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break;
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locale_id.extensions.append(extension.release_value());
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}
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locale_id.private_use_extensions = parse_private_use_extensions(lexer);
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if (!lexer.is_eof())
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return {};
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return locale_id;
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}
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String canonicalize_unicode_locale_id(StringView locale)
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{
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UErrorCode status = U_ZERO_ERROR;
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auto locale_data = LocaleData::for_locale(locale);
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VERIFY(locale_data.has_value());
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locale_data->locale().canonicalize(status);
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VERIFY(icu_success(status));
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return locale_data->to_string();
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}
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String canonicalize_unicode_extension_values(StringView key, StringView value)
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{
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UErrorCode status = U_ZERO_ERROR;
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icu::LocaleBuilder builder;
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builder.setUnicodeLocaleKeyword(icu_string_piece(key), icu_string_piece(value));
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auto locale = builder.build(status);
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VERIFY(icu_success(status));
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locale.canonicalize(status);
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VERIFY(icu_success(status));
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auto result = locale.getUnicodeKeywordValue<StringBuilder>(icu_string_piece(key), status);
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VERIFY(icu_success(status));
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return MUST(result.to_string());
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}
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StringView default_locale()
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{
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return "en"sv;
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}
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static void define_locales_without_scripts(HashTable<String>& locales)
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{
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// https://tc39.es/ecma402/#sec-internal-slots
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// For locales that include a script subtag in addition to language and region, the corresponding locale without a
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// script subtag must also be supported.
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HashTable<String> new_locales;
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auto append_locale_without_script = [&](auto const& locale) {
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auto parsed_locale = parse_unicode_language_id(locale);
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if (!parsed_locale.has_value())
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return;
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if (!parsed_locale->language.has_value() || !parsed_locale->script.has_value() || !parsed_locale->region.has_value())
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return;
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auto locale_without_script = MUST(String::formatted("{}-{}", *parsed_locale->language, *parsed_locale->region));
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new_locales.set(move(locale_without_script));
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};
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for (auto const& locale : locales)
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append_locale_without_script(locale);
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for (auto const& new_locale : new_locales)
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locales.set(new_locale);
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}
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bool is_locale_available(StringView locale)
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{
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static auto available_locales = []() {
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i32 count = 0;
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auto const* locale_list = icu::Locale::getAvailableLocales(count);
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HashTable<String> available_locales;
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available_locales.ensure_capacity(static_cast<size_t>(count));
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for (i32 i = 0; i < count; ++i) {
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UErrorCode status = U_ZERO_ERROR;
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auto locale_name = locale_list[i].toLanguageTag<StringBuilder>(status);
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|
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());
|
|
}
|
|
|
|
}
|