9446355249
It was just a wrapper for ArrayUtils::findLowerBound(), it's not used in core and it shouldn't be used anywhere outside of core (but I haven't checked). Change-Id: I53b0aca6bb642bdf6c972098170579fa13746554
599 lines
19 KiB
PHP
599 lines
19 KiB
PHP
<?php
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/**
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* Database row sorting.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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*/
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abstract class Collation {
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private static $instance;
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/**
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* @return Collation
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*/
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static function singleton() {
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if ( !self::$instance ) {
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global $wgCategoryCollation;
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self::$instance = self::factory( $wgCategoryCollation );
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}
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return self::$instance;
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}
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/**
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* @throws MWException
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* @param string $collationName
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* @return Collation
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*/
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static function factory( $collationName ) {
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switch ( $collationName ) {
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case 'uppercase':
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return new UppercaseCollation;
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case 'identity':
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return new IdentityCollation;
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case 'uca-default':
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return new IcuCollation( 'root' );
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case 'xx-uca-ckb':
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return new CollationCkb;
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default:
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$match = array();
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if ( preg_match( '/^uca-([a-z@=-]+)$/', $collationName, $match ) ) {
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return new IcuCollation( $match[1] );
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}
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# Provide a mechanism for extensions to hook in.
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$collationObject = null;
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wfRunHooks( 'Collation::factory', array( $collationName, &$collationObject ) );
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if ( $collationObject instanceof Collation ) {
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return $collationObject;
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}
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// If all else fails...
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throw new MWException( __METHOD__ . ": unknown collation type \"$collationName\"" );
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}
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}
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/**
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* Given a string, convert it to a (hopefully short) key that can be used
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* for efficient sorting. A binary sort according to the sortkeys
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* corresponds to a logical sort of the corresponding strings. Current
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* code expects that a line feed character should sort before all others, but
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* has no other particular expectations (and that one can be changed if
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* necessary).
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*
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* @param string $string UTF-8 string
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* @return string Binary sortkey
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*/
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abstract function getSortKey( $string );
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/**
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* Given a string, return the logical "first letter" to be used for
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* grouping on category pages and so on. This has to be coordinated
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* carefully with convertToSortkey(), or else the sorted list might jump
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* back and forth between the same "initial letters" or other pathological
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* behavior. For instance, if you just return the first character, but "a"
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* sorts the same as "A" based on getSortKey(), then you might get a
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* list like
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*
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* == A ==
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* * [[Aardvark]]
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*
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* == a ==
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* * [[antelope]]
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*
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* == A ==
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* * [[Ape]]
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*
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* etc., assuming for the sake of argument that $wgCapitalLinks is false.
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*
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* @param string $string UTF-8 string
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* @return string UTF-8 string corresponding to the first letter of input
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*/
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abstract function getFirstLetter( $string );
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}
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class UppercaseCollation extends Collation {
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private $lang;
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function __construct() {
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// Get a language object so that we can use the generic UTF-8 uppercase
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// function there
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$this->lang = Language::factory( 'en' );
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}
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function getSortKey( $string ) {
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return $this->lang->uc( $string );
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}
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function getFirstLetter( $string ) {
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if ( $string[0] == "\0" ) {
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$string = substr( $string, 1 );
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}
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return $this->lang->ucfirst( $this->lang->firstChar( $string ) );
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}
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}
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/**
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* Collation class that's essentially a no-op.
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*
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* Does sorting based on binary value of the string.
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* Like how things were pre 1.17.
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*/
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class IdentityCollation extends Collation {
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function getSortKey( $string ) {
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return $string;
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}
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function getFirstLetter( $string ) {
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global $wgContLang;
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// Copied from UppercaseCollation.
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// I'm kind of unclear on when this could happen...
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if ( $string[0] == "\0" ) {
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$string = substr( $string, 1 );
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}
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return $wgContLang->firstChar( $string );
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}
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}
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class IcuCollation extends Collation {
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const FIRST_LETTER_VERSION = 2;
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/** @var Collator */
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private $primaryCollator;
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/** @var Collator */
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private $mainCollator;
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/** @var */
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private $locale;
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/** @var Language */
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protected $digitTransformLanguage;
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/** @var array */
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private $firstLetterData;
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/**
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* Unified CJK blocks.
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*
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* The same definition of a CJK block must be used for both Collation and
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* generateCollationData.php. These blocks are omitted from the first
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* letter data, as an optimisation measure and because the default UCA table
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* is pretty useless for sorting Chinese text anyway. Japanese and Korean
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* blocks are not included here, because they are smaller and more useful.
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*/
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private static $cjkBlocks = array(
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array( 0x2E80, 0x2EFF ), // CJK Radicals Supplement
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array( 0x2F00, 0x2FDF ), // Kangxi Radicals
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array( 0x2FF0, 0x2FFF ), // Ideographic Description Characters
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array( 0x3000, 0x303F ), // CJK Symbols and Punctuation
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array( 0x31C0, 0x31EF ), // CJK Strokes
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array( 0x3200, 0x32FF ), // Enclosed CJK Letters and Months
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array( 0x3300, 0x33FF ), // CJK Compatibility
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array( 0x3400, 0x4DBF ), // CJK Unified Ideographs Extension A
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array( 0x4E00, 0x9FFF ), // CJK Unified Ideographs
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array( 0xF900, 0xFAFF ), // CJK Compatibility Ideographs
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array( 0xFE30, 0xFE4F ), // CJK Compatibility Forms
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array( 0x20000, 0x2A6DF ), // CJK Unified Ideographs Extension B
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array( 0x2A700, 0x2B73F ), // CJK Unified Ideographs Extension C
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array( 0x2B740, 0x2B81F ), // CJK Unified Ideographs Extension D
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array( 0x2F800, 0x2FA1F ), // CJK Compatibility Ideographs Supplement
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);
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/**
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* Additional characters (or character groups) to be considered separate
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* letters for given languages, or to be removed from the list of such
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* letters (denoted by keys starting with '-').
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*
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* These are additions to (or subtractions from) the data stored in the
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* first-letters-root.ser file (which among others includes full basic latin,
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* cyrillic and greek alphabets).
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*
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* "Separate letter" is a letter that would have a separate heading/section
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* for it in a dictionary or a phone book in this language. This data isn't
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* used for sorting (the ICU library handles that), only for deciding which
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* characters (or character groups) to use as headings.
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*
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* Initially generated based on the primary level of Unicode collation
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* tailorings available at http://developer.mimer.com/charts/tailorings.htm ,
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* later modified.
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*
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* Empty arrays are intended; this signifies that the data for the language is
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* available and that there are, in fact, no additional letters to consider.
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*/
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private static $tailoringFirstLetters = array(
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// Verified by native speakers
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'be' => array( "Ё" ),
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'be-tarask' => array( "Ё" ),
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'cy' => array( "Ch", "Dd", "Ff", "Ng", "Ll", "Ph", "Rh", "Th" ),
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'en' => array(),
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'fa' => array( "آ", "ء", "ه" ),
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'fi' => array( "Å", "Ä", "Ö" ),
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'fr' => array(),
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'hu' => array( "Cs", "Dz", "Dzs", "Gy", "Ly", "Ny", "Ö", "Sz", "Ty", "Ü", "Zs" ),
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'is' => array( "Á", "Ð", "É", "Í", "Ó", "Ú", "Ý", "Þ", "Æ", "Ö", "Å" ),
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'it' => array(),
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'lv' => array( "Č", "Ģ", "Ķ", "Ļ", "Ņ", "Š", "Ž" ),
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'pl' => array( "Ą", "Ć", "Ę", "Ł", "Ń", "Ó", "Ś", "Ź", "Ż" ),
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'pt' => array(),
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'ru' => array(),
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'sv' => array( "Å", "Ä", "Ö" ),
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'sv@collation=standard' => array( "Å", "Ä", "Ö" ),
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'uk' => array( "Ґ", "Ь" ),
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'vi' => array( "Ă", "Â", "Đ", "Ê", "Ô", "Ơ", "Ư" ),
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// Not verified, but likely correct
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'af' => array(),
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'ast' => array( "Ch", "Ll", "Ñ" ),
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'az' => array( "Ç", "Ə", "Ğ", "İ", "Ö", "Ş", "Ü" ),
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'bg' => array(),
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'br' => array( "Ch", "C'h" ),
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'bs' => array( "Č", "Ć", "Dž", "Đ", "Lj", "Nj", "Š", "Ž" ),
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'ca' => array(),
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'co' => array(),
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'cs' => array( "Č", "Ch", "Ř", "Š", "Ž" ),
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'da' => array( "Æ", "Ø", "Å" ),
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'de' => array(),
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'dsb' => array( "Č", "Ć", "Dź", "Ě", "Ch", "Ł", "Ń", "Ŕ", "Š", "Ś", "Ž", "Ź" ),
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'el' => array(),
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'eo' => array( "Ĉ", "Ĝ", "Ĥ", "Ĵ", "Ŝ", "Ŭ" ),
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'es' => array( "Ñ" ),
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'et' => array( "Š", "Ž", "Õ", "Ä", "Ö", "Ü" ),
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'eu' => array( "Ñ" ),
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'fo' => array( "Á", "Ð", "Í", "Ó", "Ú", "Ý", "Æ", "Ø", "Å" ),
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'fur' => array( "À", "Á", "Â", "È", "Ì", "Ò", "Ù" ),
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'fy' => array(),
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'ga' => array(),
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'gd' => array(),
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'gl' => array( "Ch", "Ll", "Ñ" ),
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'hr' => array( "Č", "Ć", "Dž", "Đ", "Lj", "Nj", "Š", "Ž" ),
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'hsb' => array( "Č", "Dź", "Ě", "Ch", "Ł", "Ń", "Ř", "Š", "Ć", "Ž" ),
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'kk' => array( "Ү", "І" ),
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'kl' => array( "Æ", "Ø", "Å" ),
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'ku' => array( "Ç", "Ê", "Î", "Ş", "Û" ),
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'ky' => array( "Ё" ),
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'la' => array(),
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'lb' => array(),
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'lt' => array( "Č", "Š", "Ž" ),
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'mk' => array(),
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'mo' => array( "Ă", "Â", "Î", "Ş", "Ţ" ),
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'mt' => array( "Ċ", "Ġ", "Għ", "Ħ", "Ż" ),
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'nl' => array(),
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'no' => array( "Æ", "Ø", "Å" ),
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'oc' => array(),
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'rm' => array(),
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'ro' => array( "Ă", "Â", "Î", "Ş", "Ţ" ),
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'rup' => array( "Ă", "Â", "Î", "Ľ", "Ń", "Ş", "Ţ" ),
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'sco' => array(),
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'sk' => array( "Ä", "Č", "Ch", "Ô", "Š", "Ž" ),
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'sl' => array( "Č", "Š", "Ž" ),
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'smn' => array( "Á", "Č", "Đ", "Ŋ", "Š", "Ŧ", "Ž", "Æ", "Ø", "Å", "Ä", "Ö" ),
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'sq' => array( "Ç", "Dh", "Ë", "Gj", "Ll", "Nj", "Rr", "Sh", "Th", "Xh", "Zh" ),
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'sr' => array(),
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'tk' => array( "Ç", "Ä", "Ž", "Ň", "Ö", "Ş", "Ü", "Ý" ),
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'tl' => array( "Ñ", "Ng" ),
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'tr' => array( "Ç", "Ğ", "İ", "Ö", "Ş", "Ü" ),
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'tt' => array( "Ә", "Ө", "Ү", "Җ", "Ң", "Һ" ),
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'uz' => array( "Ch", "G'", "Ng", "O'", "Sh" ),
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);
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const RECORD_LENGTH = 14;
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function __construct( $locale ) {
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if ( !extension_loaded( 'intl' ) ) {
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throw new MWException( 'An ICU collation was requested, ' .
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'but the intl extension is not available.' );
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}
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$this->locale = $locale;
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// Drop everything after the '@' in locale's name
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$localeParts = explode( '@', $locale );
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$this->digitTransformLanguage = Language::factory( $locale === 'root' ? 'en' : $localeParts[0] );
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$this->mainCollator = Collator::create( $locale );
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if ( !$this->mainCollator ) {
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throw new MWException( "Invalid ICU locale specified for collation: $locale" );
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}
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$this->primaryCollator = Collator::create( $locale );
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$this->primaryCollator->setStrength( Collator::PRIMARY );
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}
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function getSortKey( $string ) {
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// intl extension produces non null-terminated
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// strings. Appending '' fixes it so that it doesn't generate
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// a warning on each access in debug php.
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wfSuppressWarnings();
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$key = $this->mainCollator->getSortKey( $string ) . '';
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wfRestoreWarnings();
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return $key;
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}
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function getPrimarySortKey( $string ) {
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wfSuppressWarnings();
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$key = $this->primaryCollator->getSortKey( $string ) . '';
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wfRestoreWarnings();
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return $key;
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}
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function getFirstLetter( $string ) {
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$string = strval( $string );
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if ( $string === '' ) {
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return '';
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}
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// Check for CJK
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$firstChar = mb_substr( $string, 0, 1, 'UTF-8' );
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if ( ord( $firstChar ) > 0x7f && self::isCjk( utf8ToCodepoint( $firstChar ) ) ) {
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return $firstChar;
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}
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$sortKey = $this->getPrimarySortKey( $string );
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// Do a binary search to find the correct letter to sort under
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$min = ArrayUtils::findLowerBound(
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array( $this, 'getSortKeyByLetterIndex' ),
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$this->getFirstLetterCount(),
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'strcmp',
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$sortKey );
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if ( $min === false ) {
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// Before the first letter
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return '';
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}
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return $this->getLetterByIndex( $min );
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}
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function getFirstLetterData() {
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if ( $this->firstLetterData !== null ) {
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return $this->firstLetterData;
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}
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$cache = wfGetCache( CACHE_ANYTHING );
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$cacheKey = wfMemcKey( 'first-letters', $this->locale, $this->digitTransformLanguage->getCode() );
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$cacheEntry = $cache->get( $cacheKey );
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if ( $cacheEntry && isset( $cacheEntry['version'] )
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&& $cacheEntry['version'] == self::FIRST_LETTER_VERSION
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) {
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$this->firstLetterData = $cacheEntry;
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return $this->firstLetterData;
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}
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// Generate data from serialized data file
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if ( isset( self::$tailoringFirstLetters[$this->locale] ) ) {
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$letters = wfGetPrecompiledData( "first-letters-root.ser" );
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// Append additional characters
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$letters = array_merge( $letters, self::$tailoringFirstLetters[$this->locale] );
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// Remove unnecessary ones, if any
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if ( isset( self::$tailoringFirstLetters['-' . $this->locale] ) ) {
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$letters = array_diff( $letters, self::$tailoringFirstLetters['-' . $this->locale] );
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}
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// Apply digit transforms
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$digits = array( '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' );
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$letters = array_diff( $letters, $digits );
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foreach ( $digits as $digit ) {
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$letters[] = $this->digitTransformLanguage->formatNum( $digit, true );
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}
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} else {
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$letters = wfGetPrecompiledData( "first-letters-{$this->locale}.ser" );
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if ( $letters === false ) {
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throw new MWException( "MediaWiki does not support ICU locale " .
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"\"{$this->locale}\"" );
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}
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}
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// Sort the letters.
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//
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// It's impossible to have the precompiled data file properly sorted,
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// because the sort order changes depending on ICU version. If the
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// array is not properly sorted, the binary search will return random
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// results.
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//
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// We also take this opportunity to remove primary collisions.
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$letterMap = array();
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foreach ( $letters as $letter ) {
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$key = $this->getPrimarySortKey( $letter );
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if ( isset( $letterMap[$key] ) ) {
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// Primary collision
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// Keep whichever one sorts first in the main collator
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if ( $this->mainCollator->compare( $letter, $letterMap[$key] ) < 0 ) {
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$letterMap[$key] = $letter;
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}
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} else {
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$letterMap[$key] = $letter;
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}
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}
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ksort( $letterMap, SORT_STRING );
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// Remove duplicate prefixes. Basically if something has a sortkey
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// which is a prefix of some other sortkey, then it is an
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// expansion and probably should not be considered a section
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// header.
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//
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// For example 'þ' is sometimes sorted as if it is the letters
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// 'th'. Other times it is its own primary element. Another
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// example is '₨'. Sometimes its a currency symbol. Sometimes it
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// is an 'R' followed by an 's'.
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//
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// Additionally an expanded element should always sort directly
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// after its first element due to they way sortkeys work.
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//
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// UCA sortkey elements are of variable length but no collation
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// element should be a prefix of some other element, so I think
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// this is safe. See:
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// * https://ssl.icu-project.org/repos/icu/icuhtml/trunk/design/collation/ICU_collation_design.htm
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// * http://site.icu-project.org/design/collation/uca-weight-allocation
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//
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// Additionally, there is something called primary compression to
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// worry about. Basically, if you have two primary elements that
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// are more than one byte and both start with the same byte then
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// the first byte is dropped on the second primary. Additionally
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||
// 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 = array();
|
||
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 = array(
|
||
'chars' => array_values( $letterMap ),
|
||
'keys' => array_keys( $letterMap ),
|
||
'version' => self::FIRST_LETTER_VERSION,
|
||
);
|
||
|
||
// Reduce memory usage before caching
|
||
unset( $letterMap );
|
||
|
||
// Save to cache
|
||
$this->firstLetterData = $data;
|
||
$cache->set( $cacheKey, $data, 86400 * 7 /* 1 week */ );
|
||
return $data;
|
||
}
|
||
|
||
function getLetterByIndex( $index ) {
|
||
if ( $this->firstLetterData === null ) {
|
||
$this->getFirstLetterData();
|
||
}
|
||
return $this->firstLetterData['chars'][$index];
|
||
}
|
||
|
||
function getSortKeyByLetterIndex( $index ) {
|
||
if ( $this->firstLetterData === null ) {
|
||
$this->getFirstLetterData();
|
||
}
|
||
return $this->firstLetterData['keys'][$index];
|
||
}
|
||
|
||
function getFirstLetterCount() {
|
||
if ( $this->firstLetterData === null ) {
|
||
$this->getFirstLetterData();
|
||
}
|
||
return count( $this->firstLetterData['chars'] );
|
||
}
|
||
|
||
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 = array(
|
||
'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;
|
||
}
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Workaround for the lack of support of Sorani Kurdish / Central Kurdish language ('ckb') in ICU.
|
||
*
|
||
* Uses the same collation rules as Persian / Farsi ('fa'), but different characters for digits.
|
||
*/
|
||
class CollationCkb extends IcuCollation {
|
||
function __construct() {
|
||
// This will set $locale and collators, which affect the actual sorting order
|
||
parent::__construct( 'fa' );
|
||
// Override the 'fa' language set by parent constructor, which affects #getFirstLetterData()
|
||
$this->digitTransformLanguage = Language::factory( 'ckb' );
|
||
}
|
||
}
|