<?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.
 *
 * This script contains code originally found in MediaWiki (http://www.mediawiki.org). MediaWiki is also licensed under
 * the GPLv2 or later; see the file GPL included with this package for details.
 *
 * We're using the MW parser because the Text_Wiki version simply refused to work under PHP 5.2.0. Porting this was
 * _not_ easy. <leaves to get cup of coffee>
 */

global $mStripState, $wgRandomKey;
$mStripState = Array();

/**
 * emulate mediawiki parser, including stripping, etc.
 *
 * @param string $text the text to parse
 * @return string
 * @access public
 */
 
function process_tables( $text )
{
  // include some globals, do some parser stuff that would normally be done in the parent parser function
  global $mStripState;
  $x =& $mStripState;
  
  // parse the text
  $text = doTableStuff($text);

  return $text;
}

/**
 * parse the wiki syntax used to render tables
 *
 * @param string $t the text to parse
 * @return string
 * @access private
 */
function doTableStuff( $t ) {
  
  $t = explode ( "\n" , $t ) ;
  $td = array () ; # Is currently a td tag open?
  $ltd = array () ; # Was it TD or TH?
  $tr = array () ; # Is currently a tr tag open?
  $ltr = array () ; # tr attributes
  $has_opened_tr = array(); # Did this table open a <tr> element?
  $indent_level = 0; # indent level of the table
  foreach ( $t AS $k => $x )
  {
    $x = trim ( $x ) ;
    $fc = substr ( $x , 0 , 1 ) ;
    if ( preg_match( '/^(:*)\{\|(.*)$/', $x, $matches ) ) {
      $indent_level = strlen( $matches[1] );

      $attributes = unstripForHTML( $matches[2] );

      $t[$k] = str_repeat( '<dl><dd>', $indent_level ) .
        '<table' . fixTagAttributes( $attributes, 'table' ) . '>' ;
      array_push ( $td , false ) ;
      array_push ( $ltd , '' ) ;
      array_push ( $tr , false ) ;
      array_push ( $ltr , '' ) ;
      array_push ( $has_opened_tr, false );
    }
    else if ( count ( $td ) == 0 ) { } # Don't do any of the following
    else if ( '|}' == substr ( $x , 0 , 2 ) ) {
      $z = "</table>" . substr ( $x , 2);
      $l = array_pop ( $ltd ) ;
      if ( !array_pop ( $has_opened_tr ) ) $z = "<tr><td></td></tr>" . $z ;
      if ( array_pop ( $tr ) ) $z = '</tr>' . $z ;
      if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
      array_pop ( $ltr ) ;
      $t[$k] = $z . str_repeat( '</dd></dl>', $indent_level );
    }
    else if ( '|-' == substr ( $x , 0 , 2 ) ) { # Allows for |---------------
      $x = substr ( $x , 1 ) ;
      while ( $x != '' && substr ( $x , 0 , 1 ) == '-' ) $x = substr ( $x , 1 ) ;
      $z = '' ;
      $l = array_pop ( $ltd ) ;
      array_pop ( $has_opened_tr );
      array_push ( $has_opened_tr , true ) ;
      if ( array_pop ( $tr ) ) $z = '</tr>' . $z ;
      if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
      array_pop ( $ltr ) ;
      $t[$k] = $z ;
      array_push ( $tr , false ) ;
      array_push ( $td , false ) ;
      array_push ( $ltd , '' ) ;
      $attributes = unstripForHTML( $x );
      array_push ( $ltr , fixTagAttributes( $attributes, 'tr' ) ) ;
    }
    else if ( '|' == $fc || '!' == $fc || '|+' == substr ( $x , 0 , 2 ) ) { # Caption
      # $x is a table row
      if ( '|+' == substr ( $x , 0 , 2 ) ) {
        $fc = '+' ;
        $x = substr ( $x , 1 ) ;
      }
      $after = substr ( $x , 1 ) ;
      if ( $fc == '!' ) $after = str_replace ( '!!' , '||' , $after ) ;

      // Split up multiple cells on the same line.
      // FIXME: This can result in improper nesting of tags processed
      // by earlier parser steps, but should avoid splitting up eg
      // attribute values containing literal "||".
      $after = wfExplodeMarkup( '||', $after );

      $t[$k] = '' ;

      # Loop through each table cell
      foreach ( $after AS $theline )
      {
        $z = '' ;
        if ( $fc != '+' )
        {
          $tra = array_pop ( $ltr ) ;
          if ( !array_pop ( $tr ) ) $z = '<tr'.$tra.">\n" ;
          array_push ( $tr , true ) ;
          array_push ( $ltr , '' ) ;
          array_pop ( $has_opened_tr );
          array_push ( $has_opened_tr , true ) ;
        }

        $l = array_pop ( $ltd ) ;
        if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
        if ( $fc == '|' ) $l = 'td' ;
        else if ( $fc == '!' ) $l = 'th' ;
        else if ( $fc == '+' ) $l = 'caption' ;
        else $l = '' ;
        array_push ( $ltd , $l ) ;

        # Cell parameters
        $y = explode ( '|' , $theline , 2 ) ;
        # Note that a '|' inside an invalid link should not
        # be mistaken as delimiting cell parameters
        if ( strpos( $y[0], '[[' ) !== false ) {
          $y = array ($theline);
        }
        if ( count ( $y ) == 1 )
          $y = "{$z}<{$l}>{$y[0]}" ;
        else {
          $attributes = unstripForHTML( $y[0] );
          $y = "{$z}<{$l}".fixTagAttributes($attributes, $l).">{$y[1]}" ;
        }
        $t[$k] .= $y ;
        array_push ( $td , true ) ;
      }
    }
  }

  # Closing open td, tr && table
  while ( count ( $td ) > 0 )
  {
    $l = array_pop ( $ltd ) ;
    if ( array_pop ( $td ) ) $t[] = '</td>' ;
    if ( array_pop ( $tr ) ) $t[] = '</tr>' ;
    if ( !array_pop ( $has_opened_tr ) ) $t[] = "<tr><td></td></tr>" ;
    $t[] = '</table></_paragraph_bypass>' ;
  }

  $t = implode ( "\n" , $t ) ;
  
  # special case: don't return empty table
  if($t == "<table>\n<tr><td></td></tr>\n</table>")
    $t = '';
  return $t ;
}