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<?php
/**
* Database row sorting.
*
* 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
*/
abstract class Collation {
static $instance;
/**
* @return Collation
*/
static function singleton() {
if ( !self::$instance ) {
global $wgCategoryCollation;
self::$instance = self::factory( $wgCategoryCollation );
}
return self::$instance;
}
/**
* @throws MWException
* @param $collationName string
* @return Collation
*/
static function factory( $collationName ) {
switch( $collationName ) {
case 'uppercase':
return new UppercaseCollation;
case 'identity':
return new IdentityCollation;
case 'uca-default':
return new IcuCollation( 'root' );
default:
$match = array();
if ( preg_match( '/^uca-([a-z-]+)$/', $collationName, $match ) ) {
return new IcuCollation( $match[1] );
}
# Provide a mechanism for extensions to hook in.
$collationObject = null;
wfRunHooks( 'Collation::factory', array( $collationName, &$collationObject ) );
if ( $collationObject instanceof Collation ) {
return $collationObject;
}
// If all else fails...
throw new MWException( __METHOD__.": unknown collation type \"$collationName\"" );
}
}
/**
* Given a string, convert it to a (hopefully short) key that can be used
* for efficient sorting. A binary sort according to the sortkeys
* corresponds to a logical sort of the corresponding strings. Current
* code expects that a line feed character should sort before all others, but
* has no other particular expectations (and that one can be changed if
* necessary).
*
* @param string $string UTF-8 string
* @return string Binary sortkey
*/
abstract function getSortKey( $string );
/**
* Given a string, return the logical "first letter" to be used for
* grouping on category pages and so on. This has to be coordinated
* carefully with convertToSortkey(), or else the sorted list might jump
* back and forth between the same "initial letters" or other pathological
* behavior. For instance, if you just return the first character, but "a"
* sorts the same as "A" based on getSortKey(), then you might get a
* list like
*
* == A ==
* * [[Aardvark]]
*
* == a ==
* * [[antelope]]
*
* == A ==
* * [[Ape]]
*
* etc., assuming for the sake of argument that $wgCapitalLinks is false.
*
* @param string $string UTF-8 string
* @return string UTF-8 string corresponding to the first letter of input
*/
abstract function getFirstLetter( $string );
}
class UppercaseCollation extends Collation {
var $lang;
function __construct() {
// Get a language object so that we can use the generic UTF-8 uppercase
// function there
$this->lang = Language::factory( 'en' );
}
function getSortKey( $string ) {
return $this->lang->uc( $string );
}
function getFirstLetter( $string ) {
if ( $string[0] == "\0" ) {
$string = substr( $string, 1 );
}
return $this->lang->ucfirst( $this->lang->firstChar( $string ) );
}
}
/**
* Collation class that's essentially a no-op.
*
* Does sorting based on binary value of the string.
* Like how things were pre 1.17.
*/
class IdentityCollation extends Collation {
function getSortKey( $string ) {
return $string;
}
function getFirstLetter( $string ) {
global $wgContLang;
// Copied from UppercaseCollation.
// I'm kind of unclear on when this could happen...
if ( $string[0] == "\0" ) {
$string = substr( $string, 1 );
}
return $wgContLang->firstChar( $string );
}
}
class IcuCollation extends Collation {
const FIRST_LETTER_VERSION = 1;
var $primaryCollator, $mainCollator, $locale;
var $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.
*/
static $cjkBlocks = array(
array( 0x2E80, 0x2EFF ), // CJK Radicals Supplement
array( 0x2F00, 0x2FDF ), // Kangxi Radicals
array( 0x2FF0, 0x2FFF ), // Ideographic Description Characters
array( 0x3000, 0x303F ), // CJK Symbols and Punctuation
array( 0x31C0, 0x31EF ), // CJK Strokes
array( 0x3200, 0x32FF ), // Enclosed CJK Letters and Months
array( 0x3300, 0x33FF ), // CJK Compatibility
array( 0x3400, 0x4DBF ), // CJK Unified Ideographs Extension A
array( 0x4E00, 0x9FFF ), // CJK Unified Ideographs
array( 0xF900, 0xFAFF ), // CJK Compatibility Ideographs
array( 0xFE30, 0xFE4F ), // CJK Compatibility Forms
array( 0x20000, 0x2A6DF ), // CJK Unified Ideographs Extension B
array( 0x2A700, 0x2B73F ), // CJK Unified Ideographs Extension C
array( 0x2B740, 0x2B81F ), // CJK Unified Ideographs Extension D
array( 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.
*/
static $tailoringFirstLetters = array(
// Verified by native speakers
'be' => array( "Ё" ),
'be-tarask' => array( "Ё" ),
'en' => array(),
'fi' => array( "Å", "Ä", "Ö" ),
'hu' => array( "Cs", "Dz", "Dzs", "Gy", "Ly", "Ny", "Ö", "Sz", "Ty", "Ü", "Zs" ),
'it' => array(),
'pl' => array( "Ą", "Ć", "Ę", "Ł", "Ń", "Ó", "Ś", "Ź", "Ż" ),
'pt' => array(),
'ru' => array(),
'sv' => array( "Å", "Ä", "Ö" ),
'uk' => array( "Ґ", "Ь" ),
'vi' => array( "Ă", "Â", "Đ", "Ê", "Ô", "Ơ", "Ư" ),
// Not verified, but likely correct
'af' => array(),
'ast' => array( "Ch", "Ll", "Ñ" ),
'az' => array( "Ç", "Ə", "Ğ", "İ", "Ö", "Ş", "Ü" ),
'bg' => array(),
'br' => array( "Ch", "C'h" ),
'bs' => array( "Č", "Ć", "Dž", "Đ", "Lj", "Nj", "Š", "Ž" ),
'ca' => array(),
'co' => array(),
'cs' => array( "Č", "Ch", "Ř", "Š", "Ž" ),
'cy' => array( "Ch", "Dd", "Ff", "Ng", "Ll", "Ph", "Rh", "Th" ),
'da' => array( "Æ", "Ø", "Å" ),
'de' => array(),
'dsb' => array( "Č", "Ć", "Dź", "Ě", "Ch", "Ł", "Ń", "Ŕ", "Š", "Ś", "Ž", "Ź" ),
'el' => array(),
'eo' => array( "Ĉ", "Ĝ", "Ĥ", "Ĵ", "Ŝ", "Ŭ" ),
'es' => array( "Ñ" ),
'et' => array( "Š", "Ž", "Õ", "Ä", "Ö", "Ü" ),
'eu' => array( "Ñ" ),
'fo' => array( "Á", "Ð", "Í", "Ó", "Ú", "Ý", "Æ", "Ø", "Å" ),
'fr' => array(),
'fur' => array( "À", "Á", "Â", "È", "Ì", "Ò", "Ù" ),
'fy' => array(),
'ga' => array(),
'gd' => array(),
'gl' => array( "Ch", "Ll", "Ñ" ),
'hr' => array( "Č", "Ć", "Dž", "Đ", "Lj", "Nj", "Š", "Ž" ),
'hsb' => array( "Č", "Dź", "Ě", "Ch", "Ł", "Ń", "Ř", "Š", "Ć", "Ž" ),
'is' => array( "Á", "Ð", "É", "Í", "Ó", "Ú", "Ý", "Þ", "Æ", "Ö", "Å" ),
'kk' => array( "Ү", "І" ),
'kl' => array( "Æ", "Ø", "Å" ),
'ku' => array( "Ç", "Ê", "Î", "Ş", "Û" ),
'ky' => array( "Ё" ),
'la' => array(),
'lb' => array(),
'lt' => array( "Č", "Š", "Ž" ),
'lv' => array( "Č", "Ģ", "Ķ", "Ļ", "Ņ", "Š", "Ž" ),
'mk' => array(),
'mo' => array( "Ă", "Â", "Î", "Ş", "Ţ" ),
'mt' => array( "Ċ", "Ġ", "Għ", "Ħ", "Ż" ),
'nl' => array(),
'no' => array( "Æ", "Ø", "Å" ),
'oc' => array(),
'rm' => array(),
'ro' => array( "Ă", "Â", "Î", "Ş", "Ţ" ),
'rup' => array( "Ă", "Â", "Î", "Ľ", "Ń", "Ş", "Ţ" ),
'sco' => array(),
'sk' => array( "Ä", "Č", "Ch", "Ô", "Š", "Ž" ),
'sl' => array( "Č", "Š", "Ž" ),
'smn' => array( "Á", "Č", "Đ", "Ŋ", "Š", "Ŧ", "Ž", "Æ", "Ø", "Å", "Ä", "Ö" ),
'sq' => array( "Ç", "Dh", "Ë", "Gj", "Ll", "Nj", "Rr", "Sh", "Th", "Xh", "Zh" ),
'sr' => array(),
'tk' => array( "Ç", "Ä", "Ž", "Ň", "Ö", "Ş", "Ü", "Ý" ),
'tl' => array( "Ñ", "Ng" ),
'tr' => array( "Ç", "Ğ", "İ", "Ö", "Ş", "Ü" ),
'tt' => array( "Ә", "Ө", "Ү", "Җ", "Ң", "Һ" ),
'uz' => array( "Ch", "G'", "Ng", "O'", "Sh" ),
);
const RECORD_LENGTH = 14;
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;
$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 );
}
function getSortKey( $string ) {
// intl extension produces non null-terminated
// strings. Appending '' fixes it so that it doesn't generate
// a warning on each access in debug php.
wfSuppressWarnings();
$key = $this->mainCollator->getSortKey( $string ) . '';
wfRestoreWarnings();
return $key;
}
function getPrimarySortKey( $string ) {
wfSuppressWarnings();
$key = $this->primaryCollator->getSortKey( $string ) . '';
wfRestoreWarnings();
return $key;
}
function getFirstLetter( $string ) {
$string = strval( $string );
if ( $string === '' ) {
return '';
}
// Check for CJK
$firstChar = mb_substr( $string, 0, 1, 'UTF-8' );
if ( ord( $firstChar ) > 0x7f
&& self::isCjk( utf8ToCodepoint( $firstChar ) ) )
{
return $firstChar;
}
$sortKey = $this->getPrimarySortKey( $string );
// Do a binary search to find the correct letter to sort under
$min = $this->findLowerBound(
array( $this, 'getSortKeyByLetterIndex' ),
$this->getFirstLetterCount(),
'strcmp',
$sortKey );
if ( $min === false ) {
// Before the first letter
return '';
}
return $this->getLetterByIndex( $min );
}
function getFirstLetterData() {
if ( $this->firstLetterData !== null ) {
return $this->firstLetterData;
}
$cache = wfGetCache( CACHE_ANYTHING );
$cacheKey = wfMemcKey( 'first-letters', $this->locale );
$cacheEntry = $cache->get( $cacheKey );
if ( $cacheEntry && isset( $cacheEntry['version'] )
&& $cacheEntry['version'] == self::FIRST_LETTER_VERSION )
{
$this->firstLetterData = $cacheEntry;
return $this->firstLetterData;
}
// Generate data from serialized data file
if ( isset ( self::$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 ] );
}
} 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 = array();
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 = 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." );
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'] );
}
/**
* Do a binary search, and return the index of the largest item that sorts
* less than or equal to the target value.
*
* @param array $valueCallback A function to call to get the value with
* a given array index.
* @param int $valueCount The number of items accessible via $valueCallback,
* indexed from 0 to $valueCount - 1
* @param array $comparisonCallback A callback to compare two values, returning
* -1, 0 or 1 in the style of strcmp().
* @param string $target The target value to find.
*
* @return int|bool The item index of the lower bound, or false if the target value
* sorts before all items.
*/
function findLowerBound( $valueCallback, $valueCount, $comparisonCallback, $target ) {
if ( $valueCount === 0 ) {
return false;
}
$min = 0;
$max = $valueCount;
do {
$mid = $min + ( ( $max - $min ) >> 1 );
$item = call_user_func( $valueCallback, $mid );
$comparison = call_user_func( $comparisonCallback, $target, $item );
if ( $comparison > 0 ) {
$min = $mid;
} elseif ( $comparison == 0 ) {
$min = $mid;
break;
} else {
$max = $mid;
}
} while ( $min < $max - 1 );
if ( $min == 0 ) {
$item = call_user_func( $valueCallback, $min );
$comparison = call_user_func( $comparisonCallback, $target, $item );
if ( $comparison < 0 ) {
// Before the first item
return false;
}
}
return $min;
}
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|false
*/
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|false
*/
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;
}
}
}