Extension:ExtendAnchorTags

MediaWiki extensions manual

Extend Anchor Tags Release status: experimental
Implementation	Tag
Description	Adds <xa></xa> tags and parses them to <a class(es) href=''></a> tags.
Author(s)	jeffmcneill
Latest version	0.5
MediaWiki	1.7.3, 1.9.3, 1.11
License	No license specified
Download	No link 0.5 added javascript: protocol support; 0.4 added itpc:// protocol option
Added rights Released under GPL 3
Translate the ExtendAnchorTags extension if it is available at translatewiki.net
Check usage and version matrix.

What can this extension do?

The purpose is to allow added class values to be included in anchor tags, to support POSH and microformats. Builds on the AllowAnchorTags extension. Adds support for <xa></xa> tags and parses them to <a class href=></a> tags.

• Can support class, rel, and target

Usage

The URL must be specified in the following format: <xa class='some class(es)' href='http://someurl.com' target='_blank'>Some Text</xa>.

• Both class and target are optional, but including one or the other is sort of the point of this extension.

Installation

To install/test the extension kindly add it to the end of your LocalSettings.php file in your MediaWiki installation folder.

Changes to LocalSettings.php

require_once("extensions/ExtendAnchorTags.php");

Code

/**
 * ExtendAnchorTags.php
 * v.0.5 adds javascript: protocol support
 * v.0.4 adds itpc:// protocol support
 * v.0.3 has return codes to support mw 1.11
 * This extension creates the tag <xa></xa> allowing for class(es) and link attributes in anchor tags
 * written by Jeff McNeill http://jeffmcneill.com/
 * building on the work of AllowAnchorTags http://www.mediawiki.org/wiki/Extension:AllowAnchorTags
 * To activate the functionality of this extension include the following in LocalSettings.php file:
 * require_once('extensions/ExtendAnchorTags.php');
 */

#Defines the main function to be executed for this extension.
$wgExtensionFunctions[] = 'extendAnchorTag';

# Sets the hook to be executed once the parser has stripped HTML tags.
$wgHooks['ParserAfterStrip'][] = 'extendAnchorTag';

# This function initiates the hook for the parser to convert <xa></xa>
# tags to <a href=''></a> tags.
function extendAnchorTag() {
	// Declaring the global parser..
	global $wgParser;

	// Setting the hook to parse <xa></xa> tags from the parser output..
	$wgParser->setHook( 'xa', 'startExtendAnchor' );
	return(true);
}

# This function extracts the parameters from the <xa></xa> tags and
# the text between the <xa> and </xa> tags and formats them as "<a href=''>"
# tags and writes them in the document.
function startExtendAnchor( $input, $argv ) {
	// Matching to see if the URL matches the prefixes in $wgUrlProtocols.. plus some others
	if (preg_match("/^(http:\/\/|https:\/\/|ftp:\/\/|irc:\/\/|gopher:\/\/|news:|mailto:|skype:|xmpp:|itunes:|#|itpc:\/\/|javascript:)/", $argv['href'])) {
		// Fetching the 'href' parameter..
		$href = $argv['href'];
	} else {
		$href = '';
	}

	// Fetching the 'target' parameter..
	if(isset($argv['target'])) {
		$target = $argv['target'];
	} else {
		$target = '';
	}

	if (strncasecmp($input,'<img ',5) == 0) {
		$body = "<" . htmlspecialchars(preg_replace("/(^<)(.+)(>$)/","$2",$input)) . ">";
	} else {
		$body = htmlspecialchars($input);
	}

	// Fetching the 'class' parameter..
	if(isset($argv['class'])) {
		$class = $argv['class'];
	} else {
		$class = '';
	}

	// Fetching the 'rel' parameter..
	if(isset($argv['rel'])) {
		$rel = $argv['rel'];
	} else {
		$rel = '';
	}

	// Fetching the 'alt' parameter.. // note still need to incorporate this below
	if(isset($argv['alt'])) {
		$alt = $argv['alt'];
	} else {
		$alt = '';
	}

	if ($href != '' && $target != '' && $class != '' && $rel != '' ) {
		// all four
		return "<a" . " class=\"" . $class . "\"" . " rel=\"" . $rel . "\"" . " href=\"" . htmlspecialchars($href) . "\"" . " target=\"" . $target . "\">" . $body . "</a>";
	} else if ($href != '' && $target != '' && $class != '' ) {
		// target and class
		return "<a" . " class=\"" . $class . "\"" . " href=\"" . htmlspecialchars($href) . "\"" . " target=\"" . $target . "\">" . $body . "</a>";
	} else if ($href != '' && $target != '' && $rel != '' ) {
		// target and rel
		return "<a" . " rel=\"" . $rel . "\"" . " href=\"" . htmlspecialchars($href) . "\"" . " target=\"" . $target . "\">" . $body . "</a>";
	} else if ($href != '' && $class != '' && $rel != '' ) {
		// class and rel
		return "<a" . " class=\"" . $class . "\"" . " rel=\"" . $rel . "\"" . " href=\"" . htmlspecialchars($href) . "\">" . $body . "</a>";
	} else if ($href != '' && $class != '' ) {
		// class
		return "<a" . " class=\"" . $class . "\"" . " href=\"" . htmlspecialchars($href) . "\">" . $body . "</a>";
	} else if ($href != '' && $target != '' ) {
		// target 
		return "<a" . " href=\"" . htmlspecialchars($href) . "\"" . " target=\"" . $target . "\">" . $body . "</a>";
	} else if ($href != '' && $rel != '' ) {
		// rel
		return "<a" . " rel=\"" . $rel . "\"" . " href=\"" . htmlspecialchars($href) . "\">" . $body . "</a>";
	} else if ($href != '' ) {
		// nothing
		return "<a" . " href=\"" . htmlspecialchars($href) . "\">" . $body . "</a>";
	} else {
		return(false);
	}
}

To-do

• Support for alt=""
• Support to work within templates Support +1