NullReplacementMachine.php
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NullReplacementMachine.php
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	<?php

	namespace Wikimedia\LangConv;

	/**
	* A replacement machine that leaves text untouched.
	*/
	class NullReplacementMachine extends ReplacementMachine {
	private $baseLanguage;
	private $codes = [];

	/**
	* Create a NullReplacementMachine.
	* @param string $baseLanguage A base language code
	*/
	public function __construct( string $baseLanguage ) {
	$this->baseLanguage = $baseLanguage;
	$this->codes[$baseLanguage] = $baseLanguage;
	}

	/**
	* @inheritDoc
	*/
	public function getCodes() {
	return $this->codes;
	}

	/**
	* @inheritDoc
	*/
	public function isValidCodePair( $destCode, $invertCode ) {
	return $destCode === $this->baseLanguage &&
	$invertCode === $this->baseLanguage;
	}

	/**
	* @inheritDoc
	*/
	public function convert( $document, $s, $destCode, $invertCode ) {
	$result = $document->createDocumentFragment();
	$result->appendChild( $document->createTextNode( $s ) );
	return $result;
	}
	}