prefilter.jstrip.php

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<?php
/*
 * Template Lite plugin converted from Smarty
 * -------------------------------------------------------------
 * File:     prefilter.jstrip.php
 * Type:     prefilter
 * Name:     jstrip
 * Version:  1.0
 * Date:     01 Nov 2004
 * Purpose:  dummy compiler to compress javascript
 * Install:  Drop into the plugin directory,
 *           call load_filter('pre','jstrip');
 *           from your application.
 * -------------------------------------------------------------
 */

function template_prefilter_jstrip($tpl_source, &$template_object)
{
	return preg_replace_callback("/\{jstrip\}(.*?)\{\/jstrip\}/s","template_prefilter_jstrip_cb", $tpl_source);
}

function template_prefilter_jstrip_one($code)
{
	return template_prefilter_jstrip_cb(array("", $code), false);
} 

function template_prefilter_jstrip_cb($m, $literal=true)
{
	$c=$m[1];
	$o=""; //stripped output
	$comment=0; //comments
	$string=""; //current string delimiter
	$last=""; //last char in the output
	for ($i=0;$i<strlen($c);$i++)
	{
		//if ($i%100==0) {
		//print_v(array($i,$string,$comment));
		//}
		$s=true; //save the character ?
		//if we're in a string or phpcode
		if (!empty($string))
		{
			//end of the string
			if ($c[$i]==$string OR substr($c,$i,2)==$string)
			{
				$string="";
			}
			//not in a string
		}
		else
		{
			//strip comments
			if (substr($c,$i,2)=="//")
			{
				$comment=1;
			}

			if (substr($c,$i,2)=="/*")
			{
				$comment=2;
			}

			if ($comment==1 AND $c[$i]=="\n")
			{
				$comment=0;
			}

			if ($comment==2 AND substr($c,$i-1,2)=="*/")
			{
				$comment=0;
				$s=false;
			}

			if ($comment==0)
			{
				//start a string 
				if ($c[$i]=="'" OR $c[$i]=='"')
				{
					$string=$c[$i];
				}

				//start phpcode
				if (substr($c,$i,2)=="<"."?")
				{
					$string="?".">";
				}

				//line break
				if ($c[$i]=="\n" OR $c[$i]=="\r")
				{
					//is the current line finished ?
					// ")" and "}" is not OK ! (var x=function a() {}.......var )
					$finishers=array(";","{","(",",","\n",":");
					if (in_array($last,$finishers))
					{
						$s=false;
					}
				}

				//a space ! can we cut it ?
				if ($c[$i]==" " OR $c[$i]=="\t")
				{
					$cutme=array(" ","\t","}","{",")","(","[","]","<",">","=",";","+","-","/","*","\n",":","&");
					if (in_array($c[$i-1],$cutme) OR in_array($c[$i+1],$cutme))
					{
						$s=false;
					}
				}
				//todo : rename vars/functions !!
			}
		}
		//save the character
		if ($s AND $comment==0)
		{
			$o.=$c[$i];
			$last=$c[$i];
		}
	}

	if ($literal)
	{
		return "{literal}".$o."{/literal}";
	}
	else
	{
		return $o;
	}
}

?>?>