<?php
/*
Plugin Name: wptexturize bugfix
Plugin URI: http://blog.fxposter.org/2008/05/19/wptexturize-bugfix-plugin/
Description: Fix for a default wptexturize filter bug
Author: Pavel Forkert
Version: 0.1
Author URI: http://blog.fxposter.org/
*/

function wptexturize_bugfix($text) {
  global $wp_cockneyreplace;
  $next = true;
  $output = '';
  $curl = '';
  $textarr = preg_split('/(<.*>|\[.*\])/Us', $text, -1, PREG_SPLIT_DELIM_CAPTURE);
  $stop = count($textarr);

  // if a plugin has provided an autocorrect array, use it
  if ( isset($wp_cockneyreplace) ) {
    $cockney = array_keys($wp_cockneyreplace);
    $cockneyreplace = array_values($wp_cockneyreplace);
  } else {
    $cockney = array("'tain't","'twere","'twas","'tis","'twill","'til","'bout","'nuff","'round","'cause");
    $cockneyreplace = array("&#8217;tain&#8217;t","&#8217;twere","&#8217;twas","&#8217;tis","&#8217;twill","&#8217;til","&#8217;bout","&#8217;nuff","&#8217;round","&#8217;cause");
  }

  $static_characters = array_merge(array('---', ' -- ', '--', 'xn&#8211;', '...', '``', '\'s', '\'\'', ' (tm)'), $cockney);
  $static_replacements = array_merge(array('&#8212;', ' &#8212; ', '&#8211;', 'xn--', '&#8230;', '&#8220;', '&#8217;s', '&#8221;', ' &#8482;'), $cockneyreplace);

  $dynamic_characters = array('/\'(\d\d(?:&#8217;|\')?s)/', '/(\s|\A|")\'/', '/(\d+)"/', '/(\d+)\'/', '/(\S)\'([^\'\s])/', '/(\s|\A)"(?!\s)/', '/"(\s|\S|\Z)/', '/\'([\s.]|\Z)/', '/(\d+)x(\d+)/');
  $dynamic_replacements = array('&#8217;$1','$1&#8216;', '$1&#8243;', '$1&#8242;', '$1&#8217;$2', '$1&#8220;$2', '&#8221;$1', '&#8217;$1', '$1&#215;$2');

  $tag_list = array();
  for ( $i = 0; $i < $stop; $i++ ) {
    $curl = $textarr[$i];

    if (isset($curl{0}) && '<' != $curl{0} && '[' != $curl{0} && $next) { // If it's not a tag
      // static strings
      $curl = str_replace($static_characters, $static_replacements, $curl);
      // regular expressions
      $curl = preg_replace($dynamic_characters, $dynamic_replacements, $curl);
    } elseif (strpos($curl, '<code') !== false || strpos($curl, '<pre') !== false || strpos($curl, '<kbd') !== false || strpos($curl, '<style') !== false || strpos($curl, '<script') !== false) {
      $next = false;
      preg_match('/<([a-z]+)/i', $curl, $tag);
      $tag_list[] = '</' . $tag[1];
    } elseif(count($tag_list) == 0) {
      $next = true;
    } elseif (strpos($curl, end($tag_list)) !== false) {
      $next = true;
      array_pop($tag_list);
    }

    $curl = preg_replace('/&([^#])(?![a-zA-Z1-4]{1,8};)/', '&#038;$1', $curl);
    $output .= $curl;
  }

  return $output;
}

remove_filter('the_content', 'wptexturize');
add_filter('the_content', 'wptexturize_bugfix');