include/Text/Wiki/Parse/Default/Prefilter.php

   1 <?php
   2
   3 /**
   4 *
   5 * "Pre-filter" the source text.
   6 *
   7 * @category Text
   8 *
   9 * @package Text_Wiki
  10 *
  11 * @author Paul M. Jones <pmjones@php.net>
  12 *
  13 * @license LGPL
  14 *
  15 * @version $Id: Prefilter.php,v 1.3 2005/02/23 17:38:29 pmjones Exp $
  16 *
  17 */
  18
  19 /**
  20 *
  21 * "Pre-filter" the source text.
  22 *
  23 * Convert DOS and Mac line endings to Unix, concat lines ending in a
  24 * backslash \ with the next line, convert tabs to 4-spaces, add newlines
  25 * to the top and end of the source text, compress 3 or more newlines to
  26 * 2 newlines.
  27 *
  28 * @category Text
  29 *
  30 * @package Text_Wiki
  31 *
  32 * @author Paul M. Jones <pmjones@php.net>
  33 *
  34 */
  35
  36 class Text_Wiki_Parse_Prefilter extends Text_Wiki_Parse {
  37
  38
  39     /**
  40     *
  41     * Simple parsing method.
  42     *
  43     * @access public
  44     *
  45     */
  46
  47     function parse()
  48     {
  49         // convert DOS line endings
  50         $this->wiki->source = str_replace("\r\n", "\n",
  51             $this->wiki->source);
  52
  53         // convert Macintosh line endings
  54         $this->wiki->source = str_replace("\r", "\n",
  55             $this->wiki->source);
  56
  57         // concat lines ending in a backslash
  58         $this->wiki->source = str_replace("\\\n", "",
  59             $this->wiki->source);
  60
  61         // convert tabs to four-spaces
  62         $this->wiki->source = str_replace("\t", "    ",
  63             $this->wiki->source);
  64
  65         // add extra newlines at the top and end; this
  66         // seems to help many rules.
  67         $this->wiki->source = "\n" . $this->wiki->source . "\n\n";
  68
  69         // finally, compress all instances of 3 or more newlines
  70         // down to two newlines.
  71         $find = "/\n{3,}/m";
  72         $replace = "\n\n";
  73         $this->wiki->source = preg_replace($find, $replace,
  74             $this->wiki->source);
  75     }
  76
  77 }
  78 ?>