===== Link Parsing =====

>>See also: 
~-WantedFormatters
~-LinkTails
>>::c::

This page is dedicated to discussions on the development of a **better link formatter**, i.e. a formatter supporting (optional) link titles, anchors, url parameters etc.

I start posting some code that I'm using to test regex for parsing forced links. 
It should correctly parse links like the following

##""[[HomePage | (!Hello world;p=1&q=2) This is the home page with title]]""##

giving something like this: ""<a href="http://wikka.jsnx.com/HomePage?p=1&q=2" title="Hello world"> This is the home page with title</a>"".

The parentheses are used to select ;-separated URL options, like title or URL parameters. The space before the parenthesis is optional.
##!Hello world## corresponds to the title.
##p=1&q=2## corresponds to the URL parameters.

%%(php)
<?php

//$pattern = "/^\[\[(\S*)(\s\(\!(.+)\))?(\s+(.+))?\]\]$/s";
//$pattern = "/\[\[(.*)\]\]/";
$pattern = "/\[\[([^\(\)\s]+)(\s*\((.+)\))*(\s+.+)*\]\]/";

if ($q) {
	print 'String: '.$q;	
	preg_match($pattern, $q, $matches);
	if (is_array($matches)) { 
		$url = $matches[1];
		$desc = $matches[4];
		$optionlist = $matches[3];
		if ($optionlist) { 
			$options = explode(";", $optionlist);	
			if (is_array($options)) {
				echo '<br />Options: ';
				print_r($options);
				foreach($options as $option){
					switch(true){
						case (preg_match("/!(.+)/", $option, $istitle)):
						$title = $istitle[1];
						break;

						case (preg_match("=", $option, $isparameter)):
						$parameters = $isparameter[0];
						break;
					}
				}
			} else {
				echo '<br />Specified options are not valid';
			}
		} else {
			print '<br />No options';
		}
		echo '<br />Link chunks: ';
		print_r($matches);
		echo '<br />Rendered link: '.$this->Link($url, '', $desc, '', '', $title).'<br />';
	} else {
		echo 'String does not match pattern';
	}
} else {
	print 'Please enter a string';
}
?>
%%

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CategoryDevelopmentFormatters