From f1e6e7ece05bef7d1252144aa90a48e09bf5a5c6 Mon Sep 17 00:00:00 2001
From: Matthias Schmidt <gravatronics@live.com>
Date: Sat, 24 Sep 2016 21:52:56 +0200
Subject: [PATCH] Add AbstractHtmlInputNodeProcessorListener

---
 ...ctHtmlInputNodeProcessorListener.class.php | 108 ++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 wcfsetup/install/files/lib/system/event/listener/AbstractHtmlInputNodeProcessorListener.class.php

diff --git a/wcfsetup/install/files/lib/system/event/listener/AbstractHtmlInputNodeProcessorListener.class.php b/wcfsetup/install/files/lib/system/event/listener/AbstractHtmlInputNodeProcessorListener.class.php
new file mode 100644
index 0000000000..3a302b4813
--- /dev/null
+++ b/wcfsetup/install/files/lib/system/event/listener/AbstractHtmlInputNodeProcessorListener.class.php
@@ -0,0 +1,108 @@
+<?php
+namespace wcf\system\event\listener;
+use wcf\data\ITitledObject;
+use wcf\system\exception\ImplementationException;
+use wcf\system\html\input\node\HtmlInputNodeProcessor;
+use wcf\system\Regex;
+use wcf\util\DOMUtil;
+use wcf\util\JSON;
+
+/**
+ * Provides useful methods for event listeners replacing simple text links in texts
+ * with links with the name of the linked object or with bbcodes.
+ * 
+ * @author	Matthias Schmidt, Marcel Werk
+ * @copyright	2001-2016 WoltLab GmbH
+ * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
+ * @package	WoltLabSuite\Core\System\Event\Listener
+ * @since	3.0
+ */
+abstract class AbstractHtmlInputNodeProcessorListener implements IParameterizedEventListener {
+	/**
+	 * Returns the ids of the objects linked in the text proccessed by the given
+	 * processor matching the given regular expression.
+	 * 
+	 * @param	HtmlInputNodeProcessor		$processor
+	 * @param	Regex				$regex
+	 * @return	integer[]
+	 */
+	protected function getObjectIDs(HtmlInputNodeProcessor $processor, Regex $regex) {
+		$objectIDs = [];
+		foreach ($processor->getDocument()->getElementsByTagName('a') as $element) {
+			/** @var \DOMElement $element */
+			if ($element->getAttribute('href') === $element->textContent) {
+				if ($regex->match($element->getAttribute('href'), true)) {
+					$objectIDs[] = $regex->getMatches()[2][0];
+				}
+			}
+		}
+		
+		return array_unique($objectIDs);
+	}
+	
+	/**
+	 * Returns a `Regex` object for matching links based on the given string
+	 * followed by an object id.
+	 * 
+	 * @param	string		$link
+	 * @return	Regex
+	 */
+	protected function getRegexFromLink($link) {
+		return new Regex('^(' . preg_replace('~^https?~', 'https?', preg_quote($link)) . '(\d+)-.*?)$');
+	}
+	
+	/**
+	 * Replaces relevant object links with bbcodes.
+	 * 
+	 * @param	HtmlInputNodeProcessor		$processor
+	 * @param	Regex				$regex
+	 * @param	ITitledObject[]			$objects
+	 * @param	string				$bbcodeName
+	 */
+	protected function replaceLinksWithBBCode(HtmlInputNodeProcessor $processor, Regex $regex, array $objects, $bbcodeName) {
+		foreach ($processor->getDocument()->getElementsByTagName('a') as $element) {
+			/** @var \DOMElement $element */
+			if ($element->getAttribute('href') === $element->textContent) {
+				if ($regex->match($element->getAttribute('href'), true)) {
+					$objectID = $regex->getMatches()[2][0];
+					
+					if (isset($objects[$objectID])) {
+						$metacodeElement = $processor->getDocument()->createElement('woltlab-metacode');
+						$metacodeElement->setAttribute('data-name', $bbcodeName);
+						$metacodeElement->setAttribute('data-attributes', base64_encode(JSON::encode([$objectID])));
+						
+						DOMUtil::replaceElement($element, $metacodeElement, false);
+					}
+				}
+			}
+		}
+	}
+	
+	/**
+	 * Replaces the text content of relevant object links with the titles of
+	 * the objects.
+	 * 
+	 * @param	HtmlInputNodeProcessor		$processor
+	 * @param	Regex				$regex
+	 * @param	ITitledObject[]			$objects
+	 */
+	protected function setObjectTitles(HtmlInputNodeProcessor $processor, Regex $regex, array $objects) {
+		foreach ($processor->getDocument()->getElementsByTagName('a') as $element) {
+			/** @var \DOMElement $element */
+			if ($element->getAttribute('href') === $element->textContent) {
+				if ($regex->match($element->getAttribute('href'), true)) {
+					$objectID = $regex->getMatches()[2][0];
+					
+					if (isset($objects[$objectID])) {
+						$object = $objects[$objectID];
+						if (!($object instanceof ITitledObject)) {
+							throw new ImplementationException(get_class($object), ITitledObject::class);
+						}
+						
+						$element->textContent = $object->getTitle();
+					}
+				}
+			}
+		}
+	}
+}
-- 
2.20.1