DOMUtils.php
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DOMUtils.php
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	<?php

	namespace Wikimedia\RemexHtml\DOM;

	use Wikimedia\RemexHtml\HTMLData;

	class DOMUtils {
	/**
	* Replace unsupported characters with a code of the form U123456.
	*
	* @param string $name
	* @return string
	*/
	public static function coerceName( $name ) {
	$coercedName =
	mb_encode_numericentity( mb_substr( $name, 0, 1, 'UTF-8' ),
	HTMLData::$nameStartCharConvTable, 'UTF-8', true ) .
	mb_encode_numericentity( mb_substr( $name, 1, null, 'UTF-8' ),
	HTMLData::$nameCharConvTable, 'UTF-8', true );
	$coercedName = preg_replace_callback( '/&#x([0-9A-F]*);/',
	static function ( $m ) {
	return 'U' . str_pad( $m[1], 6, '0', STR_PAD_LEFT );
	},
	$coercedName );
	return $coercedName;
	}

	/**
	* Invert the encoding produced by coerceName()
	*
	* @param string $name
	* @return string
	*/
	public static function uncoerceName( $name ) {
	return mb_decode_numericentity(
	preg_replace( '/U([0-9A-F]{6})/', '&#x\1;', $name ),
	[ 0, 0x10ffff, 0, 0xffffff ],
	'UTF-8' );
	}
	}