IdentityCollation.php
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IdentityCollation.php
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	<?php
	/**
	* @license GPL-2.0-or-later
	* @file
	*/

	use MediaWiki\Language\Language;

	/**
	* Collation class that's essentially a no-op.
	*
	* Does sorting based on binary value of the string.
	* Like how things were pre 1.17.
	*
	* @since 1.18
	*/
	class IdentityCollation extends Collation {

	/** @var Language */
	private $contentLanguage;

	public function __construct( Language $contentLanguage ) {
	$this->contentLanguage = $contentLanguage;
	}

	/** @inheritDoc */
	public function getSortKey( $string ) {
	return $string;
	}

	/** @inheritDoc */
	public function getFirstLetter( $string ) {
	// Copied from UppercaseCollation.
	// I'm kind of unclear on when this could happen...
	if ( $string[0] == "\0" ) {
	$string = substr( $string, 1 );
	}
	return $this->contentLanguage->firstChar( $string );
	}
	}