outputfilter.trimwhitespace.php

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<?php
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;

}

?>