<?php

/*

 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between

 * Copyright (C) 2006-2009 Dan Fuhry

 *

 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied

 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.

 */

class Carpenter_Parse_MediaWiki

{

  public $rules = array(

    'bold'   => "/'''(.+?)'''/",

    'italic' => "/''(.+?)''/",

    'underline' => '/__(.+?)__/',

    'externalwithtext' => '#\[((?:https?|irc|ftp)://.+?) (.+?)\]#',

    'externalnotext' => '#\[((?:https?|irc|ftp)://.+?)\]#',

    'hr' => '/^[-]{4,} *$/m'

  );

  private $blockquote_rand_id;

  public function lang(&$text)

  {

    global $lang;

    preg_match_all('/<lang (?:code|id)="([a-z0-9_-]+)">([\w\W]+?)<\/lang>/', $text, $langmatch);

    foreach ( $langmatch[0] as $i => $match )

    {

      if ( $langmatch[1][$i] == $lang->lang_code )

      {

        $text = str_replace_once($match, $langmatch[2][$i], $text);

      }

      else

      {

        $text = str_replace_once($match, '', $text);

      }

    }

    return array();

  }

  public function templates(&$text)

  {

    $template_regex = "/\{\{(.+)((\n|\|[ ]*([A-z0-9]+)[ ]*=[ ]*(.+))*)\}\}/isU";

    $i = 0;

    while ( preg_match($template_regex, $text, $match) )

    {

      $i++;

      if ( $i == 5 )

        break;

      $text = RenderMan::include_templates($text);

    }

    return array();

  }

  public function heading(&$text)

  {

    if ( !preg_match_all('/^(={1,6}) *(.+?) *\\1 *$/m', $text, $results) )

      return array();

    $headings = array();

    foreach ( $results[0] as $i => $match )

    {

      $headings[] = array(

          'level' => strlen($results[1][$i]),

          'text' => $results[2][$i]

        );

    }

    $text = Carpenter::tokenize($text, $results[0]);

    return $headings;

  }

  public function multilist(&$text)

  {

    // Match entire lists

    $regex = '/^

                ([:#\*])+     # Initial list delimiter

                [ ]*

                .+?

                (?:

                  \r?\n

                  (?:\\1|[ ]{2,})

                  [ ]*

                  .+?)*

                $/mx';

    if ( !preg_match_all($regex, $text, $lists) )

      return array();

    $types = array(

        '*' => 'unordered',

        '#' => 'ordered',

        ':' => 'indent'

      );

    $pieces = array();

    foreach ( $lists[0] as $i => $list )

    {

      $token = $lists[1][$i];

      $piece = array(

          'type' => $types[$token],

          'items' => array()

        );

      // convert windows newlines to unix

      $list = str_replace("\r\n", "\n", $list);

      $items_pre = explode("\n", $list);

      $items = array();

      // first pass, go through and combine items that are newlined

      foreach ( $items_pre as $item )

      {

        if ( substr($item, 0, 1) == $token )

        {

          $items[] = $item;

        }

        else

        {

          // it's a continuation of the previous LI. Don't need to worry about

          // undefined indices here since the regex should filter out all invalid

          // markup. Just append this line to the previous.

          $items[ count($items) - 1 ] .= "\n" . trim($item);

        }

      }

      // second pass, separate items and tokens

      unset($items_pre);

      foreach ( $items as $item )

      {

        // get the depth

        $itemtoken = preg_replace('/^([#:\*]+).*$/s', '$1', $item);

        // get the text

        $itemtext = trim(substr($item, strlen($itemtoken)));

        $piece['items'][] = array(

            // depth starts at 1

            'depth' => strlen($itemtoken),

            'text' => $itemtext

          );

      }

      $pieces[] = $piece;

    }

    $text = Carpenter::tokenize($text, $lists[0]);

    return $pieces;

  }

  public function blockquote(&$text)

  {

    $rand_id = hexencode(AESCrypt::randkey(16), '', '');

    while ( preg_match_all('/^(?:(>+) *.+(?:\r?\n|$))+/m', $text, $quotes) )

    {

      foreach ( $quotes[0] as $quote )

      {

        $piece = trim(preg_replace('/^> */m', '', $quote));

        $text = str_replace_once($quote, "{blockquote:$rand_id}\n$piece\n{/blockquote:$rand_id}\n", $text);

      }

    }

    //die('<pre>' . htmlspecialchars($text) . '</pre>');

    $this->blockquote_rand_id = $rand_id;

  }

  public function blockquotepost(&$text)

  {

    return $this->blockquote_rand_id;

  }

  public function paragraph(&$text)

  {

    // The trick with paragraphs is to not turn things into them when a block level element already wraps the block of text.

    // First we need a list of block level elements (http://htmlhelp.com/reference/html40/block.html + some Enano extensions)

    $blocklevel = 'address|blockquote|center|code|div|dl|fieldset|form|h1|h2|h3|h4|h5|h6|hr|li|ol|p|pre|table|ul|tr|td|th|tbody|thead|tfoot';

    // Wrap all block level tags

    RenderMan::tag_strip('_paragraph_bypass', $text, $_nw);

    // I'm not sure why I had to go through all these alternatives. Trying to bring it

    // all down to one by ?'ing subpatterns was causing things to return empty and throwing

    // errors in the parser. Eventually, around ~3:57AM I just settled on this motherf---er

    // of a regular expression.

    // FIXME: This regexp triggers a known PHP stack size issue under win32 and possibly

    // other platforms (<http://bugs.php.net/bug.php?id=47689>). The workaround is going to

    // involve writing our own parser that takes care of recursion without using the stack,

    // which is going to be a bitch, and may not make it in until Caoineag RCs.

    $regex = ";

              <($blocklevel)

              (?:

                # self closing, no attributes

                [ ]*/>

              |

                # self closing, attributes

                [ ][^>]+? />

              |

                # with inner text, no attributes

                >

                (?: (?R) | .*? )*</\\1>

              |

                # with inner text and attributes

                [ ][^>]+?     # attributes

                >

                (?: (?R) | .*? )*</\\1>

              )

                ;sx";

    // oh. and we're using this tokens thing because for identical matches, the first match will

    // get wrapped X number of times instead of all matches getting wrapped once; replacing each

    // with a unique token id remedies this

    $tokens = array();

    $rand_id = sha1(microtime() . mt_rand());

    // Temporary hack to fix crashes under win32. Sometime I'll write a loop based

    // parser for this whole section. Maybe. Perhaps the Apache folks will fix their

    // Windows binaries first.

    if ( PHP_OS == 'WIN32' || PHP_OS == 'WINNT' )

    {

      $regex = str_replace("(?: (?R) | .*? )*", "(?: .*? )", $regex);

    }

    if ( preg_match_all($regex, $text, $matches) )

    {

      foreach ( $matches[0] as $i => $match )

      {

        $text = str_replace_once($match, "{_pb_:$rand_id:$i}", $text);

        $tokens[$i] = '<_paragraph_bypass>' . $match . '</_paragraph_bypass>';

      }

    }

    foreach ( $tokens as $i => $match )

    {

      $text = str_replace_once("{_pb_:$rand_id:$i}", $match, $text);

    }

    // die('<pre>' . htmlspecialchars($text) . '</pre>');

    RenderMan::tag_unstrip('_paragraph_bypass', $text, $_nw, true);

    // This is potentially a hack. It allows the parser to stick in <_paragraph_bypass> tags

    // to prevent the paragraph parser from interfering with pretty HTML generated elsewhere.

    RenderMan::tag_strip('_paragraph_bypass', $text, $_nw);

    $startcond = "(?!(?:[\\r\\n]|\{_paragraph_bypass:[a-f0-9]{32}:[0-9]+\}|[ ]*<\/?(?:$blocklevel)(?: .+>|>)))";

    $regex = "/^

                $startcond        # line start condition - do not match if the line starts with the condition above

                .+?               # body text

                (?:

                  \\n             # additional lines

                  $startcond      # make sure of only one newline in a row, and end the paragraph if a new line fails the start condition

                  .*?

                )*                # keep going until it fails

              $

              /mx";

    if ( !preg_match_all($regex, $text, $matches) )

    {

      RenderMan::tag_unstrip('_paragraph_bypass', $text, $_nw);

      return array();

    }

    // Debugging :)

    // die('<pre>' . htmlspecialchars($text) . "\n-----------------------------------------------------------\n" . htmlspecialchars(print_r($matches, true)) . '</pre>');

    // restore stripped

    RenderMan::tag_unstrip('_paragraph_bypass', $text, $_nw);

    // tokenize

    $text = Carpenter::tokenize($text, $matches[0]);

    return $matches[0];

  }

}

function parser_mediawiki_xhtml_image($text)

{

  $text = RenderMan::process_image_tags($text, $taglist);

  $text = RenderMan::process_imgtags_stage2($text, $taglist);

  return $text;

}

function parser_mediawiki_xhtml_tables($text)

{

  return process_tables($text);

}