LuaLibrary.php
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LuaLibrary.php
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	<?php

	namespace MediaWiki\Extension\ParserFunctions;

	use MediaWiki\Extension\Scribunto\Engines\LuaCommon\LibraryBase;
	use MediaWiki\Extension\Scribunto\Engines\LuaCommon\LuaError;

	class LuaLibrary extends LibraryBase {
	/** @inheritDoc */
	public function register() {
	$lib = [
	'expr' => [ $this, 'expr' ],
	];

	return $this->getEngine()->registerInterface(
	__DIR__ . '/mw.ext.ParserFunctions.lua', $lib, []
	);
	}

	/**
	* Forward the expression to the php expr parser
	*
	* @param string\|null $expression
	* @return string[]
	* @throws LuaError
	*/
	public function expr( $expression = null ) {
	$this->checkType( 'mw.ext.ParserFunctions.expr', 1, $expression, 'string' );
	try {
	$exprParser = new ExprParser();
	return [ $exprParser->doExpression( $expression ) ];
	} catch ( ExprError $e ) {
	throw new LuaError( $e->getMessage() );
	}
	}

	}