<?php

/**

 * Smarty plugin

 * @package Smarty

 * @subpackage plugins

 */

/**

 * Smarty trimwhitespace outputfilter plugin

 *

 * File:     outputfilter.trimwhitespace.php<br>

 * Type:     outputfilter<br>

 * Name:     trimwhitespace<br>

 * Date:     Jan 25, 2003<br>

 * Purpose:  trim leading white space and blank lines from

 *           template source after it gets interpreted, cleaning

 *           up code and saving bandwidth. Does not affect

 *           <<PRE>></PRE> and <SCRIPT></SCRIPT> blocks.<br>

 * Install:  Drop into the plugin directory, call

 *           <code>$smarty->load_filter('output','trimwhitespace');</code>

 *           from application.

 * @author   Monte Ohrt <monte at ohrt dot com>

 * @author Contributions from Lars Noschinski <lars@usenet.noschinski.de>

 * @version  1.3

 * @param string

 * @param Smarty

 */

function smarty_outputfilter_trimwhitespace($source, &$smarty)

{

    // Pull out the script blocks

    preg_match_all("!<script[^>]+>.*?</script>!is", $source, $match);

    $_script_blocks = $match[0];

    $source = preg_replace("!<script[^>]+>.*?</script>!is",

                           '@@@SMARTY:TRIM:SCRIPT@@@', $source);

    // Pull out the pre blocks

    preg_match_all("!<pre>.*?</pre>!is", $source, $match);

    $_pre_blocks = $match[0];

    $source = preg_replace("!<pre>.*?</pre>!is",

                           '@@@SMARTY:TRIM:PRE@@@', $source);

    // Pull out the textarea blocks

    preg_match_all("!<textarea[^>]+>.*?</textarea>!is", $source, $match);

    $_textarea_blocks = $match[0];

    $source = preg_replace("!<textarea[^>]+>.*?</textarea>!is",

                           '@@@SMARTY:TRIM:TEXTAREA@@@', $source);

    // remove all leading spaces, tabs and carriage returns NOT

    // preceeded by a php close tag.

    $source = trim(preg_replace('/((?<!\?>)\n)[\s]+/m', '\1', $source));

    // replace textarea blocks

    smarty_outputfilter_trimwhitespace_replace("@@@SMARTY:TRIM:TEXTAREA@@@",$_textarea_blocks, $source);

    // replace pre blocks

    smarty_outputfilter_trimwhitespace_replace("@@@SMARTY:TRIM:PRE@@@",$_pre_blocks, $source);

    // replace script blocks

    smarty_outputfilter_trimwhitespace_replace("@@@SMARTY:TRIM:SCRIPT@@@",$_script_blocks, $source);

    return $source;

}

function smarty_outputfilter_trimwhitespace_replace($search_str, $replace, &$subject) {

    $_len = strlen($search_str);

    $_pos = 0;

    for ($_i=0, $_count=count($replace); $_i<$_count; $_i++)

        if (($_pos=strpos($subject, $search_str, $_pos))!==false)

            $subject = substr_replace($subject, $replace[$_i], $_pos, $_len);

        else

            break;

}

?>