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IcuCollation.php
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IcuCollation.php
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<?php
/**
* @license GPL-2.0-or-later
* @file
*/
use MediaWiki\Language\Language;
use MediaWiki\Languages\LanguageFactory;
use MediaWiki\MediaWikiServices;
use Wikimedia\ArrayUtils\ArrayUtils;
/**
* @since 1.16.3
*/
class IcuCollation extends Collation {
private const FIRST_LETTER_VERSION = 5;
/** @var Collator */
private $primaryCollator;
/** @var Collator */
private $mainCollator;
/** @var string */
private $locale;
/** @var Language */
protected $digitTransformLanguage;
/** @var bool */
private $useNumericCollation = false;
/** @var array */
private $firstLetterData;
/**
* Unified CJK blocks.
*
* This definition should not be left behind the Unicode version used for
* the php-intl extension, especially when generating the first letter data.
*
* These blocks are omitted from the first letter data, as an optimisation
* measure and because the default UCA table is pretty useless for sorting
* Chinese text anyway. Japanese and Korean blocks are not included here,
* because they are smaller and more useful.
*/
private const CJK_BLOCKS = [
[ 0x2E80, 0x2EFF ], // CJK Radicals Supplement
[ 0x2F00, 0x2FDF ], // Kangxi Radicals
[ 0x2FF0, 0x2FFF ], // Ideographic Description Characters
[ 0x3000, 0x303F ], // CJK Symbols and Punctuation
[ 0x31C0, 0x31EF ], // CJK Strokes
[ 0x3200, 0x32FF ], // Enclosed CJK Letters and Months
[ 0x3300, 0x33FF ], // CJK Compatibility
[ 0x3400, 0x4DBF ], // CJK Unified Ideographs Extension A
[ 0x4E00, 0x9FFF ], // CJK Unified Ideographs
[ 0xF900, 0xFAFF ], // CJK Compatibility Ideographs
[ 0xFE30, 0xFE4F ], // CJK Compatibility Forms
[ 0x1F200, 0x1F2FF ], // Enclosed Ideographic Supplement
[ 0x20000, 0x2A6DF ], // CJK Unified Ideographs Extension B
[ 0x2A700, 0x2B73F ], // CJK Unified Ideographs Extension C
[ 0x2B740, 0x2B81F ], // CJK Unified Ideographs Extension D
[ 0x2B820, 0x2CEAF ], // CJK Unified Ideographs Extension E (added in Unicode 8.0)
[ 0x2CEB0, 0x2EBEF ], // CJK Unified Ideographs Extension F (added in Unicode 10.0)
[ 0x2EBF0, 0x2EE5F ], // CJK Unified Ideographs Extension I (added in Unicode 15.1)
[ 0x2F800, 0x2FA1F ], // CJK Compatibility Ideographs Supplement
[ 0x30000, 0x3134F ], // CJK Unified Ideographs Extension G (added in Unicode 13.0)
[ 0x31350, 0x323AF ], // CJK Unified Ideographs Extension H (added in Unicode 15.0)
// With the same weight as their decomposition characters listed above
[ 0x3190, 0x319F ], // Kanbun
];
/**
* Additional characters (or character groups) to be considered separate
* letters for given languages, or to be removed from the list of such
* letters (denoted by keys starting with '-').
*
* These are additions to (or subtractions from) the data stored in the
* first-letters-root.php data file (which among others includes full basic
* Latin, Cyrillic and Greek alphabets).
*
* "Separate letter" is a letter that would have a separate heading/section
* for it in a dictionary or a phone book in this language. This data isn't
* used for sorting (the ICU library handles that), only for deciding which
* characters (or character groups) to use as headings.
*
* Initially generated based on the primary level of Unicode collation
* tailorings available at http://developer.mimer.com/charts/tailorings.htm ,
* later modified.
*
* Empty arrays are intended; this signifies that the data for the language is
* available and that there are, in fact, no additional letters to consider.
*/
private const TAILORING_FIRST_LETTERS = [
'af' => [],
'am' => [],
'ar' => [],
'as' => [ "\u{0982}", "\u{0981}", "\u{0983}", "\u{09CE}", "ক্ষ " ],
'ast' => [ "Ch", "Ll", "Ñ" ], // not in libicu
'az' => [ "Ç", "Ə", "Ğ", "İ", "Ö", "Ş", "Ü" ],
'be' => [ "Ё" ],
'be-tarask' => [ "Ё" ],
'bg' => [],
'bn' => [ 'ং', 'ঃ', 'ঁ' ],
'bn@collation=traditional' => [
'ং', 'ঃ', 'ঁ', 'ক্', 'খ্', 'গ্', 'ঘ্', 'ঙ্', 'চ্', 'ছ্', 'জ্', 'ঝ্',
'ঞ্', 'ট্', 'ঠ্', 'ড্', 'ঢ্', 'ণ্', 'ৎ', 'থ্', 'দ্', 'ধ্', 'ন্', 'প্',
'ফ্', 'ব্', 'ভ্', 'ম্', 'য্', 'র্', 'ৰ্', 'ল্', 'ৱ্', 'শ্', 'ষ্', 'স্', 'হ্'
],
'bo' => [],
'br' => [ "Ch", "C'h" ],
'bs' => [ "Č", "Ć", "Dž", "Đ", "Lj", "Nj", "Š", "Ž" ],
'bs-Cyrl' => [],
'ca' => [],
'chr' => [],
'co' => [], // not in libicu
'cs' => [ "Č", "Ch", "Ř", "Š", "Ž" ],
'cy' => [ "Ch", "Dd", "Ff", "Ng", "Ll", "Ph", "Rh", "Th" ],
'da' => [ "Æ", "Ø", "Å" ],
'de' => [],
'de-AT@collation=phonebook' => [ 'ä', 'ö', 'ü', 'ß' ],
'dsb' => [ "Č", "Ć", "Dź", "Ě", "Ch", "Ł", "Ń", "Ŕ", "Š", "Ś", "Ž", "Ź" ],
'ee' => [ "Dz", "Ɖ", "Ɛ", "Ƒ", "Gb", "Ɣ", "Kp", "Ny", "Ŋ", "Ɔ", "Ts", "Ʋ" ],
'el' => [],
'en' => [],
'eo' => [ "Ĉ", "Ĝ", "Ĥ", "Ĵ", "Ŝ", "Ŭ" ],
'es' => [ "Ñ" ],
'et' => [ "Š", "Ž", "Õ", "Ä", "Ö", "Ü" ],
'eu' => [ "Ñ" ], // not in libicu
'fa' => [
// RTL, let's put each letter on a new line
"آ",
"ء",
"ه",
"ا",
"و"
],
'fi' => [ "Å", "Ä", "Ö" ],
'fil' => [ "Ñ", "Ng" ],
'fo' => [ "Á", "Ð", "Í", "Ó", "Ú", "Ý", "Æ", "Ø", "Å" ],
'fr' => [],
'fr-CA' => [], // fr-CA sorts accents slightly different from fr.
'fur' => [ "À", "Á", "Â", "È", "Ì", "Ò", "Ù" ], // not in libicu
'fy' => [], // not in libicu
'ga' => [],
'gd' => [], // not in libicu
'gl' => [ "Ch", "Ll", "Ñ" ],
'gu' => [ "\u{0A82}", "\u{0A83}", "\u{0A81}", "\u{0AB3}" ],
'ha' => [ 'Ɓ', 'Ɗ', 'Ƙ', 'Sh', 'Ts', 'Ƴ' ],
'haw' => [ 'ʻ' ],
'he' => [],
'hi' => [ "\u{0902}", "\u{0903}" ],
'hr' => [ "Č", "Ć", "Dž", "Đ", "Lj", "Nj", "Š", "Ž" ],
'hsb' => [ "Č", "Dź", "Ě", "Ch", "Ł", "Ń", "Ř", "Š", "Ć", "Ž" ],
'hu' => [ "Cs", "Dz", "Dzs", "Gy", "Ly", "Ny", "Ö", "Sz", "Ty", "Ü", "Zs" ],
'hy' => [ "և" ],
'id' => [],
'ig' => [ "Ch", "Gb", "Gh", "Gw", "Ị", "Kp", "Kw", "Ṅ", "Nw", "Ny", "Ọ", "Sh", "Ụ" ],
'is' => [ "Á", "Ð", "É", "Í", "Ó", "Ú", "Ý", "Þ", "Æ", "Ö", "Å" ],
'it' => [],
'jab' => [
"A̱", "Dz", "E̱", "Gb", "Gh", "Hw", "Hyw", "I̱", "Kh", "Kp", "Ng", "Ny",
"Sh", "Th", "Thn", "Ts", "Yw", "Zh"
],
'ka' => [],
'kk' => [ "Ё", "Ү", "І" ],
'kl' => [ "Æ", "Ø", "Å" ],
'km' => [
"រ", "ឫ", "ឬ", "ល", "ឭ", "ឮ", "\u{17BB}\u{17C6}",
"\u{17C6}", "\u{17B6}\u{17C6}", "\u{17C7}",
"\u{17B7}\u{17C7}", "\u{17BB}\u{17C7}",
"\u{17C1}\u{17C7}", "\u{17C4}\u{17C7}",
],
'kn' => [ "\u{0C81}", "\u{0C83}", "\u{0CF1}", "\u{0CF2}" ],
'kok' => [ "\u{0902}", "\u{0903}", "ळ", "क्ष" ],
'ku' => [ "Ç", "Ê", "Î", "Ş", "Û" ], // not in libicu
'ky' => [ "Ё" ],
'la' => [], // not in libicu
'lb' => [],
'lkt' => [ 'Č', 'Ǧ', 'Ȟ', 'Š', 'Ž' ],
'ln' => [ 'Ɛ' ],
'lo' => [],
'lt' => [ "Č", "Š", "Ž" ],
'lv' => [ "Č", "Ģ", "Ķ", "Ļ", "Ņ", "Š", "Ž" ],
'mk' => [ "Ѓ", "Ќ" ],
'ml' => [],
'mn' => [],
'mo' => [ "Ă", "Â", "Î", "Ș", "Ț" ], // not in libicu
'mr' => [ "\u{0902}", "\u{0903}", "ळ", "क्ष", "ज्ञ" ],
'ms' => [],
'mt' => [ "Ċ", "Ġ", "Għ", "Ħ", "Ż" ],
'nb' => [ "Æ", "Ø", "Å" ],
'ne' => [],
'nl' => [],
'nn' => [ "Æ", "Ø", "Å" ],
'no' => [ "Æ", "Ø", "Å" ], // not in libicu. You should probably use nb or nn instead.
'oc' => [], // not in libicu
'om' => [ 'Ch', 'Dh', 'Kh', 'Ny', 'Ph', 'Sh' ],
'or' => [ "\u{0B01}", "\u{0B02}", "\u{0B03}", "କ୍ଷ" ],
'pa' => [ "\u{0A4D}" ],
'pl' => [ "Ą", "Ć", "Ę", "Ł", "Ń", "Ó", "Ś", "Ź", "Ż" ],
'pt' => [],
'rm' => [], // not in libicu
'ro' => [ "Ă", "Â", "Î", "Ș", "Ț" ],
'ru' => [],
'rup' => [ "Ă", "Â", "Î", "Ľ", "Ń", "Ș", "Ț" ], // not in libicu
'sco' => [],
'se' => [
'Á', 'Č', 'Ʒ', 'Ǯ', 'Đ', 'Ǧ', 'Ǥ', 'Ǩ', 'Ŋ',
'Š', 'Ŧ', 'Ž', 'Ø', 'Æ', 'Ȧ', 'Ä', 'Ö'
],
'si' => [ "\u{0D82}", "\u{0D83}", "\u{0DA4}" ],
'sk' => [ "Ä", "Č", "Ch", "Ô", "Š", "Ž" ],
'sl' => [ "Č", "Š", "Ž" ],
'smn' => [ "Â", "Á", "Č", "Đ", "Ŋ", "Š", "Ŧ", "Ž", "Æ", "Ø", "Å", "Ä", "Ö" ],
'sq' => [ "Ç", "Dh", "Ë", "Gj", "Ll", "Nj", "Rr", "Sh", "Th", "Xh", "Zh" ],
'sr' => [],
'sr-Latn' => [ "Č", "Ć", "Dž", "Đ", "Lj", "Nj", "Š", "Ž" ],
'sv' => [ "Å", "Ä", "Ö" ],
'sv@collation=standard' => [ "Å", "Ä", "Ö" ],
'sw' => [],
'ta' => [
"\u{0B82}", "ஃ", "க்ஷ", "க்", "ங்", "ச்", "ஞ்", "ட்", "ண்", "த்", "ந்",
"ப்", "ம்", "ய்", "ர்", "ல்", "வ்", "ழ்", "ள்", "ற்", "ன்", "ஜ்", "ஶ்", "ஷ்",
"ஸ்", "ஹ்", "க்ஷ்"
],
'te' => [ "\u{0C01}", "\u{0C02}", "\u{0C03}" ],
'th' => [ "ฯ", "\u{0E46}", "\u{0E4D}", "\u{0E3A}" ],
'tk' => [ "Ç", "Ä", "Ž", "Ň", "Ö", "Ş", "Ü", "Ý" ],
'tl' => [ "Ñ", "Ng" ], // not in libicu
'to' => [ "Ng", "ʻ" ],
'tr' => [ "Ç", "Ğ", "İ", "Ö", "Ş", "Ü" ],
'-tr' => [ "ı" ],
'tt' => [ "Ә", "Ө", "Ү", "Җ", "Ң", "Һ" ], // not in libicu
'uk' => [ "Ґ", "Ь" ],
'uz' => [ "Ch", "G'", "Ng", "O'", "Sh" ], // not in libicu
'vi' => [ "Ă", "Â", "Đ", "Ê", "Ô", "Ơ", "Ư" ],
'vo' => [ "Ä", "Ö", "Ü" ],
'yi' => [
"\u{05D1}\u{05BF}", "\u{05DB}\u{05BC}", "\u{05E4}\u{05BC}",
"\u{05E9}\u{05C2}", "\u{05EA}\u{05BC}"
],
'yo' => [ "Ẹ", "Gb", "Ọ", "Ṣ" ],
'zu' => [],
// Kangxi Radicals, listed here instead of included in the
// first letter data, to avoid messing up other collations.
'zh@collation=unihan' => [
'⼀', '⼁', '⼂', '⼃', '⼄', '⼅', '⼆', '⼇', '⼈', '⼉',
'⼊', '⼋', '⼌', '⼍', '⼎', '⼏', '⼐', '⼑', '⼒', '⼓',
'⼔', '⼕', '⼖', '⼗', '⼘', '⼙', '⼚', '⼛', '⼜', '⼝',
'⼞', '⼟', '⼠', '⼡', '⼢', '⼣', '⼤', '⼥', '⼦', '⼧',
'⼨', '⼩', '⼪', '⼫', '⼬', '⼭', '⼮', '⼯', '⼰', '⼱',
'⼲', '⼳', '⼴', '⼵', '⼶', '⼷', '⼸', '⼹', '⼺', '⼻',
'⼼', '⼽', '⼾', '⼿', '⽀', '⽁', '⽂', '⽃', '⽄', '⽅',
'⽆', '⽇', '⽈', '⽉', '⽊', '⽋', '⽌', '⽍', '⽎', '⽏',
'⽐', '⽑', '⽒', '⽓', '⽔', '⽕', '⽖', '⽗', '⽘', '⽙',
'⽚', '⽛', '⽜', '⽝', '⽞', '⽟', '⽠', '⽡', '⽢', '⽣',
'⽤', '⽥', '⽦', '⽧', '⽨', '⽩', '⽪', '⽫', '⽬', '⽭',
'⽮', '⽯', '⽰', '⽱', '⽲', '⽳', '⽴', '⽵', '⽶', '⽷',
'⽸', '⽹', '⽺', '⽻', '⽼', '⽽', '⽾', '⽿', '⾀', '⾁',
'⾂', '⾃', '⾄', '⾅', '⾆', '⾇', '⾈', '⾉', '⾊', '⾋',
'⾌', '⾍', '⾎', '⾏', '⾐', '⾑', '⾒', '⾓', '⾔', '⾕',
'⾖', '⾗', '⾘', '⾙', '⾚', '⾛', '⾜', '⾝', '⾞', '⾟',
'⾠', '⾡', '⾢', '⾣', '⾤', '⾥', '⾦', '⾧', '⾨', '⾩',
'⾪', '⾫', '⾬', '⾭', '⾮', '⾯', '⾰', '⾱', '⾲', '⾳',
'⾴', '⾵', '⾶', '⾷', '⾸', '⾹', '⾺', '⾻', '⾼', '⾽',
'⾾', '⾿', '⿀', '⿁', '⿂', '⿃', '⿄', '⿅', '⿆', '⿇',
'⿈', '⿉', '⿊', '⿋', '⿌', '⿍', '⿎', '⿏', '⿐', '⿑',
'⿒', '⿓', '⿔', '⿕',
],
// Compiled from https://raw.githubusercontent.com/unicode-org/icu/main/icu4c/source/data/coll/zh.txt
'zh@collation=pinyin' => [
"\u{FDD0}A", "\u{FDD0}B", "\u{FDD0}C", "\u{FDD0}D", "\u{FDD0}E",
"\u{FDD0}F", "\u{FDD0}G", "\u{FDD0}H", "\u{FDD0}J", "\u{FDD0}K",
"\u{FDD0}L", "\u{FDD0}M", "\u{FDD0}N", "\u{FDD0}O", "\u{FDD0}P",
"\u{FDD0}Q", "\u{FDD0}R", "\u{FDD0}S", "\u{FDD0}T", "\u{FDD0}W",
"\u{FDD0}X", "\u{FDD0}Y", "\u{FDD0}Z",
],
'zh@collation=zhuyin' => [
"\u{FDD0}ㄅ", "\u{FDD0}ㄆ", "\u{FDD0}ㄇ", "\u{FDD0}ㄈ", "\u{FDD0}ㄪ",
"\u{FDD0}ㄉ", "\u{FDD0}ㄊ", "\u{FDD0}ㄋ", "\u{FDD0}ㄌ", "\u{FDD0}ㄍ",
"\u{FDD0}ㄎ", "\u{FDD0}ㄏ", "\u{FDD0}ㄐ", "\u{FDD0}ㄑ", "\u{FDD0}ㄒ",
"\u{FDD0}ㄬ", "\u{FDD0}ㄓ", "\u{FDD0}ㄔ", "\u{FDD0}ㄕ", "\u{FDD0}ㄖ",
"\u{FDD0}ㄗ", "\u{FDD0}ㄘ", "\u{FDD0}ㄙ", "\u{FDD0}ㄚ", "\u{FDD0}ㄛ",
"\u{FDD0}ㄜ", "\u{FDD0}ㄞ", "\u{FDD0}ㄟ", "\u{FDD0}ㄠ", "\u{FDD0}ㄡ",
"\u{FDD0}ㄢ", "\u{FDD0}ㄣ", "\u{FDD0}ㄤ", "\u{FDD0}ㄥ", "\u{FDD0}ㄦ",
"\u{FDD0}ㄧ", "\u{FDD0}ㄨ", "\u{FDD0}ㄩ",
],
'zh@collation=stroke' => [
"\u{FDD0}\u{2801}", "\u{FDD0}\u{2802}", "\u{FDD0}\u{2803}",
"\u{FDD0}\u{2804}", "\u{FDD0}\u{2805}", "\u{FDD0}\u{2806}",
"\u{FDD0}\u{2807}", "\u{FDD0}\u{2808}", "\u{FDD0}\u{2809}",
"\u{FDD0}\u{280A}", "\u{FDD0}\u{280B}", "\u{FDD0}\u{280C}",
"\u{FDD0}\u{280D}", "\u{FDD0}\u{280E}", "\u{FDD0}\u{280F}",
"\u{FDD0}\u{2810}", "\u{FDD0}\u{2811}", "\u{FDD0}\u{2812}",
"\u{FDD0}\u{2813}", "\u{FDD0}\u{2814}", "\u{FDD0}\u{2815}",
"\u{FDD0}\u{2816}", "\u{FDD0}\u{2817}", "\u{FDD0}\u{2818}",
"\u{FDD0}\u{2819}", "\u{FDD0}\u{281A}", "\u{FDD0}\u{281B}",
"\u{FDD0}\u{281C}", "\u{FDD0}\u{281D}", "\u{FDD0}\u{281E}",
"\u{FDD0}\u{281F}", "\u{FDD0}\u{2820}", "\u{FDD0}\u{2821}",
// Not every possible stroke count is used in Chinese characters
"\u{FDD0}\u{2823}", "\u{FDD0}\u{2824}", "\u{FDD0}\u{2827}",
"\u{FDD0}\u{2830}",
]
];
/**
* @param LanguageFactory $languageFactory
* @param string $locale
*/
public function __construct(
LanguageFactory $languageFactory,
$locale
) {
$this->locale = $locale;
// Drop everything after the '@' in locale's name
$localeParts = explode( '@', $locale );
$this->digitTransformLanguage = $languageFactory->getLanguage( $locale === 'root' ? 'en' : $localeParts[0] );
$mainCollator = Collator::create( $locale );
if ( !$mainCollator ) {
throw new InvalidArgumentException( "Invalid ICU locale specified for collation: $locale" );
}
$this->mainCollator = $mainCollator;
// @phan-suppress-next-line PhanPossiblyNullTypeMismatchProperty successed before, no null check needed
$this->primaryCollator = Collator::create( $locale );
$this->primaryCollator->setStrength( Collator::PRIMARY );
// If the special suffix for numeric collation is present, turn on numeric collation.
if ( str_ends_with( $locale, '-u-kn' ) ) {
$this->useNumericCollation = true;
// Strip off the special suffix so it doesn't trip up fetchFirstLetterData().
$this->locale = substr( $this->locale, 0, -5 );
$this->mainCollator->setAttribute( Collator::NUMERIC_COLLATION, Collator::ON );
$this->primaryCollator->setAttribute( Collator::NUMERIC_COLLATION, Collator::ON );
}
}
/** @inheritDoc */
public function getSortKey( $string ) {
return $this->mainCollator->getSortKey( $string );
}
/** @inheritDoc */
public function getFirstLetter( $string ) {
$string = strval( $string );
if ( $string === '' ) {
return '';
}
$langCode = explode( '@', $this->locale )[0];
$firstChar = mb_substr( $string, 0, 1, 'UTF-8' );
// If the first character is a CJK character, just return that character.
if ( $langCode !== 'zh' && ord( $firstChar ) > 0x7f && self::isCjk( mb_ord( $firstChar ) ) ) {
return $firstChar;
}
$sortKey = $this->getPrimarySortKey( $string );
$data = $this->getFirstLetterData();
$keys = $data['keys'];
$letters = $data['chars'];
// Do a binary search to find the correct letter to sort under
$min = ArrayUtils::findLowerBound(
static function ( $index ) use ( $keys ) {
return $keys[$index];
},
count( $keys ),
'strcmp',
$sortKey );
if ( $min === false ) {
// Before the first letter
return '';
}
$sortLetter = $letters[$min];
if ( str_starts_with( $sortLetter, "\u{FDD0}" ) ) {
$sortLetter = substr( $sortLetter, strlen( "\u{FDD0}" ) );
}
if ( $this->useNumericCollation ) {
// If the sort letter is a number, return '0–9' (or localized equivalent).
// ASCII value of 0 is 48. ASCII value of 9 is 57.
// Note that this also applies to non-Arabic numerals since they are
// mapped to Arabic numeral sort letters. For example, ২ sorts as 2.
if ( ord( $sortLetter ) >= 48 && ord( $sortLetter ) <= 57 ) {
$sortLetter = wfMessage( 'category-header-numerals' )->numParams( 0, 9 )->text();
}
}
return $sortLetter;
}
private function getPrimarySortKey( string $string ): string {
return $this->primaryCollator->getSortKey( $string );
}
/**
* @since 1.16.3
* @return array
*/
private function getFirstLetterData() {
if ( $this->firstLetterData === null ) {
$cache = MediaWikiServices::getInstance()->getObjectCacheFactory()
->getLocalServerInstance( CACHE_ANYTHING );
$cacheKey = $cache->makeKey(
'first-letters',
static::class,
$this->locale,
$this->digitTransformLanguage->getCode(),
INTL_ICU_VERSION,
self::FIRST_LETTER_VERSION
);
$this->firstLetterData = $cache->getWithSetCallback( $cacheKey, $cache::TTL_WEEK, function () {
return $this->fetchFirstLetterData();
} );
}
return $this->firstLetterData;
}
/**
* @return array
*/
private function fetchFirstLetterData() {
// Generate data from serialized data file
if ( isset( self::TAILORING_FIRST_LETTERS[$this->locale] ) ) {
$letters = require __DIR__ . "/data/first-letters-root.php";
// Append additional characters
$letters = array_merge( $letters, self::TAILORING_FIRST_LETTERS[$this->locale] );
// Remove unnecessary ones, if any
if ( isset( self::TAILORING_FIRST_LETTERS['-' . $this->locale] ) ) {
$letters = array_diff( $letters, self::TAILORING_FIRST_LETTERS['-' . $this->locale] );
}
// Apply digit transforms
$digits = [ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' ];
$letters = array_diff( $letters, $digits );
foreach ( $digits as $digit ) {
$letters[] = $this->digitTransformLanguage->formatNumNoSeparators( $digit );
}
} elseif ( $this->locale === 'root' ) {
$letters = require __DIR__ . "/data/first-letters-root.php";
} else {
throw new RuntimeException( "MediaWiki does not support ICU locale " .
"\"{$this->locale}\"" );
}
/* Sort the letters.
*
* It's impossible to have the precompiled data file properly sorted,
* because the sort order changes depending on ICU version. If the
* array is not properly sorted, the binary search will return random
* results.
*
* We also take this opportunity to remove primary collisions.
*/
$letterMap = [];
foreach ( $letters as $letter ) {
$key = $this->getPrimarySortKey( $letter );
if ( isset( $letterMap[$key] ) ) {
// Primary collision (two characters with the same sort position).
// Keep whichever one sorts first in the main collator.
$comp = $this->mainCollator->compare( $letter, $letterMap[$key] );
wfDebug( "Primary collision '$letter' '{$letterMap[$key]}' (comparison: $comp)" );
// If that also has a collision, use codepoint as a tiebreaker.
if ( $comp === 0 ) {
$comp = mb_ord( $letter ) <=> mb_ord( $letterMap[$key] );
}
if ( $comp < 0 ) {
$letterMap[$key] = $letter;
}
} else {
$letterMap[$key] = $letter;
}
}
ksort( $letterMap, SORT_STRING );
/* Remove duplicate prefixes. Basically, if something has a sortkey
* which is a prefix of some other sortkey, then it is an
* expansion and probably should not be considered a section
* header.
*
* For example, 'þ' is sometimes sorted as if it is the letters
* 'th'. Other times it is its own primary element. Another
* example is '₨'. Sometimes it's a currency symbol. Sometimes it
* is an 'R' followed by an 's'.
*
* Additionally, an expanded element should always sort directly
* after its first element due to the way sortkeys work.
*
* UCA sortkey elements are of variable length, but no collation
* element should be a prefix of some other element, so I think
* this is safe. See:
* - https://unicode-org.github.io/icu-docs/design/collation/ICU_collation_design.htm
* - https://icu.unicode.org/design/collation/uca-weight-allocation
*
* Additionally, there is something called primary compression to
* worry about. Basically, if you have two primary elements that
* are more than one byte and both start with the same byte, then
* the first byte is dropped on the second primary. Additionally,
* either \x03 or \xFF may be added to mean that the next primary
* does not start with the first byte of the first primary.
*
* This shouldn't matter much, as the first primary is not
* changed, and that is what we are comparing against.
*
* tl;dr: This makes some assumptions about how ICU implements
* collations. It seems incredibly unlikely these assumptions
* will change, but nonetheless they are assumptions.
*/
$prev = '';
$duplicatePrefixes = [];
foreach ( $letterMap as $key => $value ) {
// Due to the fact the array is sorted, we only have
// to compare with the element directly previous
// to the current element (skipping expansions).
// An element "X" will always sort directly
// before "XZ" (Unless we have "XY", but we
// do not update $prev in that case).
if ( $prev !== '' && str_starts_with( $key, $prev ) ) {
$duplicatePrefixes[] = $key;
// If this is an expansion, we don't want to
// compare the next element to this element,
// but to what is currently $prev
continue;
}
$prev = $key;
}
foreach ( $duplicatePrefixes as $badKey ) {
wfDebug( "Removing '{$letterMap[$badKey]}' from first letters." );
unset( $letterMap[$badKey] );
// This code assumes that unsetting does not change sort order.
}
return [
'chars' => array_values( $letterMap ),
'keys' => array_keys( $letterMap ),
];
}
/**
* Test if a code point is a CJK (Chinese, Japanese, Korean) character
* @param int $codepoint
* @return bool
* @since 1.16.3
*/
public static function isCjk( $codepoint ) {
foreach ( self::CJK_BLOCKS as $block ) {
if ( $codepoint >= $block[0] && $codepoint <= $block[1] ) {
return true;
}
}
return false;
}
}

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