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<?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 = 2;
/** @var Collator */
private $primaryCollator;
/** @var Collator */
private $mainCollator;
/** @var string */
private $locale;
/** @var Language */
protected $digitTransformLanguage;
/** @var boolean */
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 = [
// Verified by native speakers
'be' => [ "Ё" ],
'be-tarask' => [ "Ё" ],
'bs' => [ "Č", "Ć", "Dž", "Đ", "Lj", "Nj", "Š", "Ž" ],
'cs' => [ "Č", "Ch", "Ř", "Š", "Ž" ],
'cy' => [ "Ch", "Dd", "Ff", "Ng", "Ll", "Ph", "Rh", "Th" ],
'en' => [],
'fa' => [
// RTL, let's put each letter on a new line
"آ",
"ء",
"ه",
"ا",
"و"
],
'fi' => [ "Å", "Ä", "Ö" ],
'fr' => [],
'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" ],
'is' => [ "Á", "Ð", "É", "Í", "Ó", "Ú", "Ý", "Þ", "Æ", "Ö", "Å" ],
'it' => [],
'lt' => [ "Č", "Š", "Ž" ],
'lv' => [ "Č", "Ģ", "Ķ", "Ļ", "Ņ", "Š", "Ž" ],
'mk' => [ "Ѓ", "Ќ" ],
'nl' => [],
'pl' => [ "Ą", "Ć", "Ę", "Ł", "Ń", "Ó", "Ś", "Ź", "Ż" ],
'pt' => [],
'ru' => [],
'sk' => [ "Ä", "Č", "Ch", "Ô", "Š", "Ž" ],
'sr' => [],
'sv' => [ "Å", "Ä", "Ö" ],
'sv@collation=standard' => [ "Å", "Ä", "Ö" ],
'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"
],
'uk' => [ "Ґ", "Ь" ],
'vi' => [ "Ă", "Â", "Đ", "Ê", "Ô", "Ơ", "Ư" ],
// Not verified, but likely correct
'af' => [],
'ast' => [ "Ch", "Ll", "Ñ" ],
'az' => [ "Ç", "Ə", "Ğ", "İ", "Ö", "Ş", "Ü" ],
'bg' => [],
'br' => [ "Ch", "C'h" ],
'ca' => [],
'co' => [],
'da' => [ "Æ", "Ø", "Å" ],
'de' => [],
'dsb' => [ "Č", "Ć", "Dź", "Ě", "Ch", "Ł", "Ń", "Ŕ", "Š", "Ś", "Ž", "Ź" ],
'el' => [],
'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" ],
'fo' => [ "Á", "Ð", "Í", "Ó", "Ú", "Ý", "Æ", "Ø", "Å" ],
'fur' => [ "À", "Á", "Â", "È", "Ì", "Ò", "Ù" ],
'fy' => [],
'ga' => [],
'gd' => [],
'gl' => [ "Ch", "Ll", "Ñ" ],
'kk' => [ "Ү", "І" ],
'kl' => [ "Æ", "Ø", "Å" ],
'ku' => [ "Ç", "Ê", "Î", "Ş", "Û" ],
'ky' => [ "Ё" ],
'la' => [],
'lb' => [],
'mo' => [ "Ă", "Â", "Î", "Ş", "Ţ" ],
'mt' => [ "Ċ", "Ġ", "Għ", "Ħ", "Ż" ],
'no' => [ "Æ", "Ø", "Å" ],
'oc' => [],
'rm' => [],
'ro' => [ "Ă", "Â", "Î", "Ş", "Ţ" ],
'rup' => [ "Ă", "Â", "Î", "Ľ", "Ń", "Ş", "Ţ" ],
'sco' => [],
'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" ],
'tk' => [ "Ç", "Ä", "Ž", "Ň", "Ö", "Ş", "Ü", "Ý" ],
'tl' => [ "Ñ", "Ng" ],
'tr' => [ "Ç", "Ğ", "İ", "Ö", "Ş", "Ü" ],
'tt' => [ "Ә", "Ө", "Ү", "Җ", "Ң", "Һ" ],
'uz' => [ "Ch", "G'", "Ng", "O'", "Sh" ],
];
/**
* @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',
$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
// Keep whichever one sorts first in the main collator
if ( $this->mainCollator->compare( $letter, $letterMap[$key] ) < 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;
}
/**
* @since 1.16.3
*/
public function getLetterByIndex( $index ) {
return $this->getFirstLetterData()['chars'][$index];
}
/**
* @since 1.16.3
*/
public function getSortKeyByLetterIndex( $index ) {
return $this->getFirstLetterData()['keys'][$index];
}
/**
* @since 1.16.3
*/
public function getFirstLetterCount() {
return count( $this->getFirstLetterData()['chars'] );
}
/**
* Test if a code point is a CJK (Chinese, Japanese, Korean) character
* @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 bug 54561).
* This function will return false on older PHPs.
*
* @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() {
$icuVersion = IcuCollation::getICUVersion();
if ( !$icuVersion ) {
return false;
}
$versionPrefix = substr( $icuVersion, 0, 3 );
// Source: http://site.icu-project.org/download
$map = [
'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;
}
}
}