<?php

/**

* 

* "Pre-filter" the source text.

* 

* @category Text

* 

* @package Text_Wiki

* 

* @author Paul M. Jones <pmjones@php.net>

* 

* @license LGPL

* 

* @version $Id: Prefilter.php,v 1.3 2005/02/23 17:38:29 pmjones Exp $

* 

*/

/**

* 

* "Pre-filter" the source text.

* 

* Convert DOS and Mac line endings to Unix, concat lines ending in a

* backslash \ with the next line, convert tabs to 4-spaces, add newlines

* to the top and end of the source text, compress 3 or more newlines to

* 2 newlines.

*

* @category Text

* 

* @package Text_Wiki

* 

* @author Paul M. Jones <pmjones@php.net>

* 

*/

class Text_Wiki_Parse_Prefilter extends Text_Wiki_Parse {

    /**

    * 

    * Simple parsing method.

    *

    * @access public

    * 

    */

    function parse()

    {

        // convert DOS line endings

        $this->wiki->source = str_replace("\r\n", "\n",

            $this->wiki->source);

        // convert Macintosh line endings

        $this->wiki->source = str_replace("\r", "\n",

            $this->wiki->source);

        // concat lines ending in a backslash

        $this->wiki->source = str_replace("\\\n", "",

            $this->wiki->source);

        // convert tabs to four-spaces

        $this->wiki->source = str_replace("\t", "    ",

            $this->wiki->source);

        // add extra newlines at the top and end; this

        // seems to help many rules.

        $this->wiki->source = "\n" . $this->wiki->source . "\n\n";

        // finally, compress all instances of 3 or more newlines

        // down to two newlines.

        $find = "/\n{3,}/m";

        $replace = "\n\n";

        $this->wiki->source = preg_replace($find, $replace,

            $this->wiki->source);

    }

}

?>