Re: Play nice! Re: Savant/Flexy/Foo template engines

Sorry to keep replying to myself about the filters thing.

* An extended toString() seems the logical place for output filters to be applied.

I'm still not convinced that output filters are anything more that preg_replaces on the output to toString.. -

I think that's exactly what they are. Is that bad? How else is one to implement an output filter? Yes, streams allow you to register filtering functions, but not everybody knows streams that well (I sure don't :-).

... might use str_replace, too, for speed, or ereg (for whatever reason).

Smarty has this little goodie as an output filter, and it's definitely more than just a regex: 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 script blocks
    smarty_outputfilter_trimwhitespace_replace("@@@SMARTY:TRIM:SCRIPT@@@",$_script_blocks, $source);

    // replace pre blocks
    smarty_outputfilter_trimwhitespace_replace("@@@SMARTY:TRIM:PRE@@@",$_pre_blocks, $source);

    // replace textarea blocks
    smarty_outputfilter_trimwhitespace_replace("@@@SMARTY:TRIM:TEXTAREA@@@",$_textarea_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;

} -- Paul M. Jones Savant: the simple alternative to Smarty for PHP. http://phpsavant.com/ DB_Table: build RDBMS tables and XHTML forms in one PHP class. http://wiki.ciaweb.net/yawiki/index.php?area=DB_Table Yawiki: your collaborative online documentation system. http://yawiki.com/ Yawp: a single-file foundation for PHP applications. http://phpyawp.com/