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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
*
* @since 1.30
*
* @file
*/
/**
* Resort normal UTF-8 order by putting a bunch of stuff in PUA
*
* This takes a bunch of characters (The alphabet) that should,
* be together, and converts them all to private-use-area characters
* so that they are all sorted in the right order relative to each
* other.
*
* This renumbers characters starting at U+F3000 (Chosen to avoid
* conflicts with other people using private use area)
*
* This does not support fancy things like secondary differences, etc.
* (It supports digraphs, trigraphs etc. though.)
*
* It is expected most people will subclass this and just override the
* constructor to hard-code an alphabet.
*/
class CustomUppercaseCollation extends NumericUppercaseCollation {
/** @var array $alphabet Sorted array of letters */
private $alphabet;
/** @var array $puaSubset List of private use area codes */
private $puaSubset;
/**
* @note This assumes $alphabet does not contain U+F3000-U+F3FFF
*
* @param array $alphabet Sorted array of uppercase characters.
* @param Language $lang What language for number sorting.
*/
public function __construct( array $alphabet, Language $lang ) {
if ( count( $alphabet ) < 1 || count( $alphabet ) >= 4096 ) {
throw new UnexpectedValueException( "Alphabet must be < 4096 items" );
}
$this->firstLetters = $alphabet;
// For digraphs, only the first letter is capitalized in input
$this->alphabet = array_map( [ $lang, 'uc' ], $alphabet );
$this->puaSubset = [];
$len = count( $alphabet );
for ( $i = 0; $i < $len; $i++ ) {
$this->puaSubset[] = "\xF3\xB3" . chr( floor( $i / 64 ) + 128 ) . chr( ( $i % 64 ) + 128 );
}
// Sort these arrays so that any trigraphs, digraphs etc. are first
// (and they get replaced first in convertToPua()).
$lengths = array_map( 'mb_strlen', $this->alphabet );
array_multisort( $lengths, SORT_DESC, $this->firstLetters, $this->alphabet, $this->puaSubset );
parent::__construct( $lang );
}
private function convertToPua( $string ) {
return str_replace( $this->alphabet, $this->puaSubset, $string );
}
public function getSortKey( $string ) {
return $this->convertToPua( parent::getSortKey( $string ) );
}
public function getFirstLetter( $string ) {
$sortkey = $this->getSortKey( $string );
// In case a title begins with a character from our alphabet, return the corresponding
// first-letter. (This also happens if the title has a corresponding PUA code in it, to avoid
// inconsistent behaviour. This class mostly assumes that people will not use PUA codes.)
$index = array_search( substr( $sortkey, 0, 4 ), $this->puaSubset );
if ( $index !== false ) {
return $this->firstLetters[ $index ];
}
// String begins with a character outside of our alphabet, fall back
return parent::getFirstLetter( $string );
}
}
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