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Diffstat (limited to 'www/wiki/includes/collation/IcuCollation.php')
| -rw-r--r-- | www/wiki/includes/collation/IcuCollation.php | 588 |
1 files changed, 588 insertions, 0 deletions
diff --git a/www/wiki/includes/collation/IcuCollation.php b/www/wiki/includes/collation/IcuCollation.php new file mode 100644 index 00000000..9ac81ae0 --- /dev/null +++ b/www/wiki/includes/collation/IcuCollation.php @@ -0,0 +1,588 @@ +<?php +/** + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * http://www.gnu.org/copyleft/gpl.html + * + * @file + */ + +/** + * @since 1.16.3 + */ +class IcuCollation extends Collation { + const FIRST_LETTER_VERSION = 3; + + /** @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. + * + * The same definition of a CJK block must be used for both Collation and + * generateCollationData.php. 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 static $cjkBlocks = [ + [ 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 + [ 0x20000, 0x2A6DF ], // CJK Unified Ideographs Extension B + [ 0x2A700, 0x2B73F ], // CJK Unified Ideographs Extension C + [ 0x2B740, 0x2B81F ], // CJK Unified Ideographs Extension D + [ 0x2F800, 0x2FA1F ], // CJK Compatibility Ideographs Supplement + ]; + + /** + * 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.ser 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 static $tailoringFirstLetters = [ + 'af' => [], + 'am' => [], + 'ar' => [], + 'as' => [ "\xe0\xa6\x82", "\xe0\xa6\x81", "\xe0\xa6\x83", "\xe0\xa7\x8e", "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", "W" ], // added W for CollationEt (xx-uca-et) + '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' => [ "\xe0\xaa\x82", "\xe0\xaa\x83", "\xe0\xaa\x81", "\xe0\xaa\xb3" ], + 'ha' => [ 'Ɓ', 'Ɗ', 'Ƙ', 'Sh', 'Ts', 'Ƴ' ], + 'haw' => [ 'ʻ' ], + 'he' => [], + 'hi' => [ "\xe0\xa4\x82", "\xe0\xa4\x83" ], + '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' => [], + 'ka' => [], + 'kk' => [ "Ү", "І" ], + 'kl' => [ "Æ", "Ø", "Å" ], + 'km' => [ + "រ", "ឫ", "ឬ", "ល", "ឭ", "ឮ", "\xe1\x9e\xbb\xe1\x9f\x86", + "\xe1\x9f\x86", "\xe1\x9e\xb6\xe1\x9f\x86", "\xe1\x9f\x87", + "\xe1\x9e\xb7\xe1\x9f\x87", "\xe1\x9e\xbb\xe1\x9f\x87", + "\xe1\x9f\x81\xe1\x9f\x87", "\xe1\x9f\x84\xe1\x9f\x87", + ], + 'kn' => [ "\xe0\xb2\x81", "\xe0\xb2\x83", "\xe0\xb3\xb1", "\xe0\xb3\xb2" ], + 'kok' => [ "\xe0\xa4\x82", "\xe0\xa4\x83", "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' => [ "\xe0\xa4\x82", "\xe0\xa4\x83", "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' => [ "\xe0\xac\x81", "\xe0\xac\x82", "\xe0\xac\x83", "କ୍ଷ" ], + 'pa' => [ "\xe0\xa9\x8d" ], + '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' => [ "\xe0\xb6\x82", "\xe0\xb6\x83", "\xe0\xb6\xa4" ], + 'sk' => [ "Ä", "Č", "Ch", "Ô", "Š", "Ž" ], + 'sl' => [ "Č", "Š", "Ž" ], + 'smn' => [ "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' => [ + "\xE0\xAE\x82", "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' => [ "\xe0\xb0\x81", "\xe0\xb0\x82", "\xe0\xb0\x83" ], + 'th' => [ "ฯ", "\xe0\xb9\x86", "\xe0\xb9\x8d", "\xe0\xb8\xba" ], + '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" ], + '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' => [ + "\xd7\x91\xd6\xbf", "\xd7\x9b\xd6\xbc", "\xd7\xa4\xd6\xbc", + "\xd7\xa9\xd7\x82", "\xd7\xaa\xd6\xbc" + ], + 'yo' => [ "Ẹ", "Gb", "Ọ", "Ṣ" ], + 'zu' => [], + ]; + + /** + * @since 1.16.3 + */ + const RECORD_LENGTH = 14; + + public function __construct( $locale ) { + if ( !extension_loaded( 'intl' ) ) { + throw new MWException( 'An ICU collation was requested, ' . + 'but the intl extension is not available.' ); + } + + $this->locale = $locale; + // Drop everything after the '@' in locale's name + $localeParts = explode( '@', $locale ); + $this->digitTransformLanguage = Language::factory( $locale === 'root' ? 'en' : $localeParts[0] ); + + $this->mainCollator = Collator::create( $locale ); + if ( !$this->mainCollator ) { + throw new MWException( "Invalid ICU locale specified for collation: $locale" ); + } + + $this->primaryCollator = Collator::create( $locale ); + $this->primaryCollator->setStrength( Collator::PRIMARY ); + + // If the special suffix for numeric collation is present, turn on numeric collation. + if ( substr( $locale, -5, 5 ) === '-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 ); + } + } + + public function getSortKey( $string ) { + return $this->mainCollator->getSortKey( $string ); + } + + public function getPrimarySortKey( $string ) { + return $this->primaryCollator->getSortKey( $string ); + } + + public function getFirstLetter( $string ) { + $string = strval( $string ); + if ( $string === '' ) { + return ''; + } + + $firstChar = mb_substr( $string, 0, 1, 'UTF-8' ); + + // If the first character is a CJK character, just return that character. + if ( ord( $firstChar ) > 0x7f && self::isCjk( UtfNormal\Utils::utf8ToCodepoint( $firstChar ) ) ) { + return $firstChar; + } + + $sortKey = $this->getPrimarySortKey( $string ); + + // Do a binary search to find the correct letter to sort under + $min = ArrayUtils::findLowerBound( + [ $this, 'getSortKeyByLetterIndex' ], + $this->getFirstLetterCount(), + 'strcmp', + $sortKey ); + + if ( $min === false ) { + // Before the first letter + return ''; + } + + $sortLetter = $this->getLetterByIndex( $min ); + + 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; + } + + /** + * @since 1.16.3 + * @return array + */ + public function getFirstLetterData() { + if ( $this->firstLetterData === null ) { + $cache = ObjectCache::getLocalServerInstance( CACHE_ANYTHING ); + $cacheKey = $cache->makeKey( + 'first-letters', + static::class, + $this->locale, + $this->digitTransformLanguage->getCode(), + self::getICUVersion(), + self::FIRST_LETTER_VERSION + ); + $this->firstLetterData = $cache->getWithSetCallback( $cacheKey, $cache::TTL_WEEK, function () { + return $this->fetchFirstLetterData(); + } ); + } + return $this->firstLetterData; + } + + /** + * @return array + * @throws MWException + */ + private function fetchFirstLetterData() { + // Generate data from serialized data file + if ( isset( self::$tailoringFirstLetters[$this->locale] ) ) { + $letters = wfGetPrecompiledData( 'first-letters-root.ser' ); + // Append additional characters + $letters = array_merge( $letters, self::$tailoringFirstLetters[$this->locale] ); + // Remove unnecessary ones, if any + if ( isset( self::$tailoringFirstLetters['-' . $this->locale] ) ) { + $letters = array_diff( $letters, self::$tailoringFirstLetters['-' . $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->formatNum( $digit, true ); + } + } else { + $letters = wfGetPrecompiledData( "first-letters-{$this->locale}.ser" ); + if ( $letters === false ) { + throw new MWException( "MediaWiki does not support ICU locale " . + "\"{$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)\n" ); + // If that also has a collision, use codepoint as a tiebreaker. + if ( $comp === 0 ) { + // TODO Use <=> operator when PHP 7 is allowed. + $comp = UtfNormal\Utils::utf8ToCodepoint( $letter ) - + UtfNormal\Utils::utf8ToCodepoint( $letterMap[$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 its 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 they 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://ssl.icu-project.org/repos/icu/icuhtml/trunk/design/collation/ICU_collation_design.htm + * - http://site.icu-project.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 = false; + $duplicatePrefixes = []; + foreach ( $letterMap as $key => $value ) { + // Remove terminator byte. Otherwise the prefix + // comparison will get hung up on that. + $trimmedKey = rtrim( $key, "\0" ); + if ( $prev === false || $prev === '' ) { + $prev = $trimmedKey; + // We don't yet have a collation element + // to compare against, so continue. + continue; + } + + // 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 ( substr( $trimmedKey, 0, strlen( $prev ) ) === $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 = $trimmedKey; + } + foreach ( $duplicatePrefixes as $badKey ) { + wfDebug( "Removing '{$letterMap[$badKey]}' from first letters.\n" ); + unset( $letterMap[$badKey] ); + // This code assumes that unsetting does not change sort order. + } + $data = [ + 'chars' => array_values( $letterMap ), + 'keys' => array_keys( $letterMap ), + ]; + + // Reduce memory usage before caching + unset( $letterMap ); + + return $data; + } + + /** + * @param string $index + * @return string + * @since 1.16.3 + */ + public function getLetterByIndex( $index ) { + return $this->getFirstLetterData()['chars'][$index]; + } + + /** + * @param string $index + * @return string + * @since 1.16.3 + */ + public function getSortKeyByLetterIndex( $index ) { + return $this->getFirstLetterData()['keys'][$index]; + } + + /** + * @return string + * @since 1.16.3 + */ + public function getFirstLetterCount() { + return count( $this->getFirstLetterData()['chars'] ); + } + + /** + * 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( $codepoint ) { + foreach ( self::$cjkBlocks as $block ) { + if ( $codepoint >= $block[0] && $codepoint <= $block[1] ) { + return true; + } + } + return false; + } + + /** + * Return the version of ICU library used by PHP's intl extension, + * or false when the extension is not installed of the version + * can't be determined. + * + * The constant INTL_ICU_VERSION this function refers to isn't really + * documented. It is available since PHP 5.3.7 (see PHP 54561 + * https://bugs.php.net/bug.php?id=54561). This function will return + * false on older PHPs. + * + * TODO: Remove the backwards-compatibility as MediaWiki now requires + * higher levels of PHP. + * + * @since 1.21 + * @return string|bool + */ + static function getICUVersion() { + return defined( 'INTL_ICU_VERSION' ) ? INTL_ICU_VERSION : false; + } + + /** + * Return the version of Unicode appropriate for the version of ICU library + * currently in use, or false when it can't be determined. + * + * @since 1.21 + * @return string|bool + */ + static function getUnicodeVersionForICU() { + $icuVersion = self::getICUVersion(); + if ( !$icuVersion ) { + return false; + } + + $versionPrefix = substr( $icuVersion, 0, 3 ); + // Source: http://site.icu-project.org/download + $map = [ + '59.' => '9.0', + '58.' => '9.0', + '57.' => '8.0', + '56.' => '8.0', + '55.' => '7.0', + '54.' => '7.0', + '53.' => '6.3', + '52.' => '6.3', + '51.' => '6.2', + '50.' => '6.2', + '49.' => '6.1', + '4.8' => '6.0', + '4.6' => '6.0', + '4.4' => '5.2', + '4.2' => '5.1', + '4.0' => '5.1', + '3.8' => '5.0', + '3.6' => '5.0', + '3.4' => '4.1', + ]; + + if ( isset( $map[$versionPrefix] ) ) { + return $map[$versionPrefix]; + } else { + return false; + } + } +} |