138 lines
4.9 KiB
PHP
138 lines
4.9 KiB
PHP
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<?php
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/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; under version 2
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* of the License (non-upgradable).
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright (c) 2002-2008 (original work) Public Research Centre Henri Tudor & University of Luxembourg (under the project TAO & TAO2);
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* 2008-2010 (update and modification) Deutsche Institut für Internationale Pädagogische Forschung (under the project TAO-TRANSFER);
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* 2009-2012 (update and modification) Public Research Centre Henri Tudor (under the project TAO-SUSTAIN & TAO-DEV);
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*
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*/
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/**
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* This helper class aims at providing utility methods to deal
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* with XHTML documents.
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*
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* @author Jerome Bogaerts <jerome@taotesting.com>
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*
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*/
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class taoItems_helpers_Xhtml
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{
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/**
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* Determines if a given DOMDocument contains <script> elements with
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* a 'src' attribute value that matches a given PCRE pattern.
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*
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* The pattern will be applied only on the base name found in the src attribute.
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*
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* @param DOMDocument $dom A DOMDocument.
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* @param string $pattern A PCRE pattern.
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* @return boolean Returns true if the requested script element(s) could be found, othewise false.
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*/
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public static function hasScriptElements(DOMDocument $dom, $pattern)
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{
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return count(self::getScriptElements($dom, $pattern)) > 0;
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}
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/**
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* Retrieve <script> elements in the given DOMDocument where the src attribute value
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* matches a PCRE pattern.
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*
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* The pattern will be applied only on the base name found in the src attribute.
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*
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* @param DOMDocument $dom A DOMDocument
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* @param string $pattern A PCRE pattern.
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* @return array An array of DOMNode.
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*/
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public static function getScriptElements(DOMDocument $dom, $pattern)
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{
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$xpath = new DOMXPath($dom);
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$elements = [];
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$scan = $xpath->query('/html/head/script');
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for ($i = 0; $i < $scan->length; $i++) {
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$e = $scan->item($i);
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if ($e->hasAttribute('src')) {
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$src = $e->getAttribute('src');
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$pathinfo = pathinfo($src);
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if (!empty($pathinfo['basename'])) {
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$filename = $pathinfo['basename'];
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if (preg_match($pattern, $filename) === 1) {
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$elements[] = $e;
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}
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}
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}
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}
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return $elements;
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}
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/**
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* Remove <script> elements in a DOMDocument that have an src attribute value
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* that matches a given PCRE pattern.
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*
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* The pattern will be applied only on the base name found in the src attribute.
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*
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* @param DOMDocument $dom A DOMDocument.
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* @param string $pattern A PCRE pattern.
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* @return int The number of found elements.
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*/
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public static function removeScriptElements(DOMDocument $dom, $pattern)
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{
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$removed = 0;
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foreach (self::getScriptElements($dom, $pattern) as $e) {
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if (!empty($e->parentNode)) {
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$e->parentNode->removeChild($e);
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$removed++;
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}
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}
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return $removed;
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}
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/**
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* Add a <script> element in the <head> element of a DOMDocument.
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*
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* @param DOMDocument $dom A DOMDocument.
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* @param string $src The value of the 'src' attribute.
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* @param string $append (optional) Append or prepend the node to the <head> element.
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* @param string $type (optional) The value of the 'type' attribute.
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*/
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public static function addScriptElement(DOMDocument $dom, $src, $append = true, $type = 'text/javascript')
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{
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$xpath = new DOMXPath($dom);
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$scan = $xpath->query('/html/head');
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$newNode = $dom->createElement('script');
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$newNode->setAttribute('type', $type);
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$newNode->setAttribute('src', $src);
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for ($i = 0; $i < $scan->length; $i++) {
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$head = $scan->item($i);
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if ($append == true || $xpath->query('//script', $head)->length == 0) {
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$head->appendChild($newNode);
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} else {
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$refNode = $xpath->query('//script', $head)->item(0);
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$head->insertBefore($newNode, $refNode);
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}
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break;
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}
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}
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}
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