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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
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15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
16 * http://www.gnu.org/copyleft/gpl.html
24 class IcuCollation
extends Collation
{
25 const FIRST_LETTER_VERSION
= 2;
28 private $primaryCollator;
31 private $mainCollator;
37 protected $digitTransformLanguage;
40 private $firstLetterData;
45 * The same definition of a CJK block must be used for both Collation and
46 * generateCollationData.php. These blocks are omitted from the first
47 * letter data, as an optimisation measure and because the default UCA table
48 * is pretty useless for sorting Chinese text anyway. Japanese and Korean
49 * blocks are not included here, because they are smaller and more useful.
51 private static $cjkBlocks = [
52 [ 0x2E80, 0x2EFF ], // CJK Radicals Supplement
53 [ 0x2F00, 0x2FDF ], // Kangxi Radicals
54 [ 0x2FF0, 0x2FFF ], // Ideographic Description Characters
55 [ 0x3000, 0x303F ], // CJK Symbols and Punctuation
56 [ 0x31C0, 0x31EF ], // CJK Strokes
57 [ 0x3200, 0x32FF ], // Enclosed CJK Letters and Months
58 [ 0x3300, 0x33FF ], // CJK Compatibility
59 [ 0x3400, 0x4DBF ], // CJK Unified Ideographs Extension A
60 [ 0x4E00, 0x9FFF ], // CJK Unified Ideographs
61 [ 0xF900, 0xFAFF ], // CJK Compatibility Ideographs
62 [ 0xFE30, 0xFE4F ], // CJK Compatibility Forms
63 [ 0x20000, 0x2A6DF ], // CJK Unified Ideographs Extension B
64 [ 0x2A700, 0x2B73F ], // CJK Unified Ideographs Extension C
65 [ 0x2B740, 0x2B81F ], // CJK Unified Ideographs Extension D
66 [ 0x2F800, 0x2FA1F ], // CJK Compatibility Ideographs Supplement
70 * Additional characters (or character groups) to be considered separate
71 * letters for given languages, or to be removed from the list of such
72 * letters (denoted by keys starting with '-').
74 * These are additions to (or subtractions from) the data stored in the
75 * first-letters-root.ser file (which among others includes full basic latin,
76 * cyrillic and greek alphabets).
78 * "Separate letter" is a letter that would have a separate heading/section
79 * for it in a dictionary or a phone book in this language. This data isn't
80 * used for sorting (the ICU library handles that), only for deciding which
81 * characters (or character groups) to use as headings.
83 * Initially generated based on the primary level of Unicode collation
84 * tailorings available at http://developer.mimer.com/charts/tailorings.htm ,
87 * Empty arrays are intended; this signifies that the data for the language is
88 * available and that there are, in fact, no additional letters to consider.
90 private static $tailoringFirstLetters = [
91 // Verified by native speakers
93 'be-tarask' => [ "Ё" ],
94 'cy' => [ "Ch", "Dd", "Ff", "Ng", "Ll", "Ph", "Rh", "Th" ],
96 // RTL, let's put each letter on a new line
104 'fi' => [ "Å", "Ä", "Ö" ],
106 'hu' => [ "Cs", "Dz", "Dzs", "Gy", "Ly", "Ny", "Ö", "Sz", "Ty", "Ü", "Zs" ],
107 'is' => [ "Á", "Ð", "É", "Í", "Ó", "Ú", "Ý", "Þ", "Æ", "Ö", "Å" ],
109 'lv' => [ "Č", "Ģ", "Ķ", "Ļ", "Ņ", "Š", "Ž" ],
110 'pl' => [ "Ą", "Ć", "Ę", "Ł", "Ń", "Ó", "Ś", "Ź", "Ż" ],
113 'sv' => [ "Å", "Ä", "Ö" ],
114 'sv@collation=standard' => [ "Å", "Ä", "Ö" ],
115 'uk' => [ "Ґ", "Ь" ],
116 'vi' => [ "Ă", "Â", "Đ", "Ê", "Ô", "Ơ", "Ư" ],
117 // Not verified, but likely correct
119 'ast' => [ "Ch", "Ll", "Ñ" ],
120 'az' => [ "Ç", "Ə", "Ğ", "İ", "Ö", "Ş", "Ü" ],
122 'br' => [ "Ch", "C'h" ],
123 'bs' => [ "Č", "Ć", "Dž", "Đ", "Lj", "Nj", "Š", "Ž" ],
126 'cs' => [ "Č", "Ch", "Ř", "Š", "Ž" ],
127 'da' => [ "Æ", "Ø", "Å" ],
129 'dsb' => [ "Č", "Ć", "Dź", "Ě", "Ch", "Ł", "Ń", "Ŕ", "Š", "Ś", "Ž", "Ź" ],
131 'eo' => [ "Ĉ", "Ĝ", "Ĥ", "Ĵ", "Ŝ", "Ŭ" ],
133 'et' => [ "Š", "Ž", "Õ", "Ä", "Ö", "Ü", "W" ], // added W for CollationEt (xx-uca-et)
135 'fo' => [ "Á", "Ð", "Í", "Ó", "Ú", "Ý", "Æ", "Ø", "Å" ],
136 'fur' => [ "À", "Á", "Â", "È", "Ì", "Ò", "Ù" ],
140 'gl' => [ "Ch", "Ll", "Ñ" ],
141 'hr' => [ "Č", "Ć", "Dž", "Đ", "Lj", "Nj", "Š", "Ž" ],
142 'hsb' => [ "Č", "Dź", "Ě", "Ch", "Ł", "Ń", "Ř", "Š", "Ć", "Ž" ],
143 'kk' => [ "Ү", "І" ],
144 'kl' => [ "Æ", "Ø", "Å" ],
145 'ku' => [ "Ç", "Ê", "Î", "Ş", "Û" ],
149 'lt' => [ "Č", "Š", "Ž" ],
151 'mo' => [ "Ă", "Â", "Î", "Ş", "Ţ" ],
152 'mt' => [ "Ċ", "Ġ", "Għ", "Ħ", "Ż" ],
154 'no' => [ "Æ", "Ø", "Å" ],
157 'ro' => [ "Ă", "Â", "Î", "Ş", "Ţ" ],
158 'rup' => [ "Ă", "Â", "Î", "Ľ", "Ń", "Ş", "Ţ" ],
160 'sk' => [ "Ä", "Č", "Ch", "Ô", "Š", "Ž" ],
161 'sl' => [ "Č", "Š", "Ž" ],
162 'smn' => [ "Á", "Č", "Đ", "Ŋ", "Š", "Ŧ", "Ž", "Æ", "Ø", "Å", "Ä", "Ö" ],
163 'sq' => [ "Ç", "Dh", "Ë", "Gj", "Ll", "Nj", "Rr", "Sh", "Th", "Xh", "Zh" ],
166 "\xE0\xAE\x82", "ஃ", "க்ஷ", "க்", "ங்", "ச்", "ஞ்", "ட்", "ண்", "த்", "ந்",
167 "ப்", "ம்", "ய்", "ர்", "ல்", "வ்", "ழ்", "ள்", "ற்", "ன்", "ஜ்", "ஶ்", "ஷ்",
170 'tk' => [ "Ç", "Ä", "Ž", "Ň", "Ö", "Ş", "Ü", "Ý" ],
171 'tl' => [ "Ñ", "Ng" ],
172 'tr' => [ "Ç", "Ğ", "İ", "Ö", "Ş", "Ü" ],
173 'tt' => [ "Ә", "Ө", "Ү", "Җ", "Ң", "Һ" ],
174 'uz' => [ "Ch", "G'", "Ng", "O'", "Sh" ],
180 const RECORD_LENGTH
= 14;
182 public function __construct( $locale ) {
183 if ( !extension_loaded( 'intl' ) ) {
184 throw new MWException( 'An ICU collation was requested, ' .
185 'but the intl extension is not available.' );
188 $this->locale
= $locale;
189 // Drop everything after the '@' in locale's name
190 $localeParts = explode( '@', $locale );
191 $this->digitTransformLanguage
= Language
::factory( $locale === 'root' ?
'en' : $localeParts[0] );
193 $this->mainCollator
= Collator
::create( $locale );
194 if ( !$this->mainCollator
) {
195 throw new MWException( "Invalid ICU locale specified for collation: $locale" );
198 $this->primaryCollator
= Collator
::create( $locale );
199 $this->primaryCollator
->setStrength( Collator
::PRIMARY
);
202 public function getSortKey( $string ) {
203 return $this->mainCollator
->getSortKey( $string );
206 public function getPrimarySortKey( $string ) {
207 return $this->primaryCollator
->getSortKey( $string );
210 public function getFirstLetter( $string ) {
211 $string = strval( $string );
212 if ( $string === '' ) {
217 $firstChar = mb_substr( $string, 0, 1, 'UTF-8' );
218 if ( ord( $firstChar ) > 0x7f && self
::isCjk( UtfNormal\Utils
::utf8ToCodepoint( $firstChar ) ) ) {
222 $sortKey = $this->getPrimarySortKey( $string );
224 // Do a binary search to find the correct letter to sort under
225 $min = ArrayUtils
::findLowerBound(
226 [ $this, 'getSortKeyByLetterIndex' ],
227 $this->getFirstLetterCount(),
231 if ( $min === false ) {
232 // Before the first letter
235 return $this->getLetterByIndex( $min );
242 public function getFirstLetterData() {
243 if ( $this->firstLetterData
=== null ) {
244 $cache = ObjectCache
::getLocalServerInstance( CACHE_ANYTHING
);
245 $cacheKey = $cache->makeKey(
248 $this->digitTransformLanguage
->getCode(),
249 self
::getICUVersion(),
250 self
::FIRST_LETTER_VERSION
252 $this->firstLetterData
= $cache->getWithSetCallback( $cacheKey, $cache::TTL_WEEK
, function () {
253 return $this->fetchFirstLetterData();
256 return $this->firstLetterData
;
261 * @throws MWException
263 private function fetchFirstLetterData() {
264 // Generate data from serialized data file
265 if ( isset( self
::$tailoringFirstLetters[$this->locale
] ) ) {
266 $letters = wfGetPrecompiledData( 'first-letters-root.ser' );
267 // Append additional characters
268 $letters = array_merge( $letters, self
::$tailoringFirstLetters[$this->locale
] );
269 // Remove unnecessary ones, if any
270 if ( isset( self
::$tailoringFirstLetters['-' . $this->locale
] ) ) {
271 $letters = array_diff( $letters, self
::$tailoringFirstLetters['-' . $this->locale
] );
273 // Apply digit transforms
274 $digits = [ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' ];
275 $letters = array_diff( $letters, $digits );
276 foreach ( $digits as $digit ) {
277 $letters[] = $this->digitTransformLanguage
->formatNum( $digit, true );
280 $letters = wfGetPrecompiledData( "first-letters-{$this->locale}.ser" );
281 if ( $letters === false ) {
282 throw new MWException( "MediaWiki does not support ICU locale " .
283 "\"{$this->locale}\"" );
289 * It's impossible to have the precompiled data file properly sorted,
290 * because the sort order changes depending on ICU version. If the
291 * array is not properly sorted, the binary search will return random
294 * We also take this opportunity to remove primary collisions.
297 foreach ( $letters as $letter ) {
298 $key = $this->getPrimarySortKey( $letter );
299 if ( isset( $letterMap[$key] ) ) {
301 // Keep whichever one sorts first in the main collator
302 if ( $this->mainCollator
->compare( $letter, $letterMap[$key] ) < 0 ) {
303 $letterMap[$key] = $letter;
306 $letterMap[$key] = $letter;
309 ksort( $letterMap, SORT_STRING
);
311 /* Remove duplicate prefixes. Basically if something has a sortkey
312 * which is a prefix of some other sortkey, then it is an
313 * expansion and probably should not be considered a section
316 * For example 'þ' is sometimes sorted as if it is the letters
317 * 'th'. Other times it is its own primary element. Another
318 * example is '₨'. Sometimes its a currency symbol. Sometimes it
319 * is an 'R' followed by an 's'.
321 * Additionally an expanded element should always sort directly
322 * after its first element due to they way sortkeys work.
324 * UCA sortkey elements are of variable length but no collation
325 * element should be a prefix of some other element, so I think
327 * - https://ssl.icu-project.org/repos/icu/icuhtml/trunk/design/collation/ICU_collation_design.htm
328 * - http://site.icu-project.org/design/collation/uca-weight-allocation
330 * Additionally, there is something called primary compression to
331 * worry about. Basically, if you have two primary elements that
332 * are more than one byte and both start with the same byte then
333 * the first byte is dropped on the second primary. Additionally
334 * either \x03 or \xFF may be added to mean that the next primary
335 * does not start with the first byte of the first primary.
337 * This shouldn't matter much, as the first primary is not
338 * changed, and that is what we are comparing against.
340 * tl;dr: This makes some assumptions about how icu implements
341 * collations. It seems incredibly unlikely these assumptions
342 * will change, but nonetheless they are assumptions.
346 $duplicatePrefixes = [];
347 foreach ( $letterMap as $key => $value ) {
348 // Remove terminator byte. Otherwise the prefix
349 // comparison will get hung up on that.
350 $trimmedKey = rtrim( $key, "\0" );
351 if ( $prev === false ||
$prev === '' ) {
353 // We don't yet have a collation element
354 // to compare against, so continue.
358 // Due to the fact the array is sorted, we only have
359 // to compare with the element directly previous
360 // to the current element (skipping expansions).
361 // An element "X" will always sort directly
362 // before "XZ" (Unless we have "XY", but we
363 // do not update $prev in that case).
364 if ( substr( $trimmedKey, 0, strlen( $prev ) ) === $prev ) {
365 $duplicatePrefixes[] = $key;
366 // If this is an expansion, we don't want to
367 // compare the next element to this element,
368 // but to what is currently $prev
373 foreach ( $duplicatePrefixes as $badKey ) {
374 wfDebug( "Removing '{$letterMap[$badKey]}' from first letters.\n" );
375 unset( $letterMap[$badKey] );
376 // This code assumes that unsetting does not change sort order.
379 'chars' => array_values( $letterMap ),
380 'keys' => array_keys( $letterMap ),
383 // Reduce memory usage before caching
392 public function getLetterByIndex( $index ) {
393 return $this->getFirstLetterData()['chars'][$index];
399 public function getSortKeyByLetterIndex( $index ) {
400 return $this->getFirstLetterData()['keys'][$index];
406 public function getFirstLetterCount() {
407 return count( $this->getFirstLetterData()['chars'] );
413 public static function isCjk( $codepoint ) {
414 foreach ( self
::$cjkBlocks as $block ) {
415 if ( $codepoint >= $block[0] && $codepoint <= $block[1] ) {
423 * Return the version of ICU library used by PHP's intl extension,
424 * or false when the extension is not installed of the version
425 * can't be determined.
427 * The constant INTL_ICU_VERSION this function refers to isn't really
428 * documented. It is available since PHP 5.3.7 (see PHP bug 54561).
429 * This function will return false on older PHPs.
432 * @return string|bool
434 static function getICUVersion() {
435 return defined( 'INTL_ICU_VERSION' ) ? INTL_ICU_VERSION
: false;
439 * Return the version of Unicode appropriate for the version of ICU library
440 * currently in use, or false when it can't be determined.
443 * @return string|bool
445 static function getUnicodeVersionForICU() {
446 $icuVersion = IcuCollation
::getICUVersion();
447 if ( !$icuVersion ) {
451 $versionPrefix = substr( $icuVersion, 0, 3 );
452 // Source: http://site.icu-project.org/download
466 if ( isset( $map[$versionPrefix] ) ) {
467 return $map[$versionPrefix];