解析BBCode代码并将其转换成HTML

3. [代码]操作类     跳至 [2] [3] [全屏预览]

                 <?php
//http://www.codepearl.com
##########################################
#            BBCode parser 1.0
# Description:    Convert BBCode style text to html
# Developed by:   Ramunas Pilotas
# Email:          woolfas@gmail.com 
# Licence:        GLP
########################################## 
 
// Warning:
//   Although this class should not have unexpected results, the use of this
//   class is at the risk of the user. The author can not be responsible
//   if any damage is caused by this class.
 
 
class BBCode {
 
  private static $simple_search = array(
    '/\[b\](.*?)\[\/b\]/is',
    '/\[i\](.*?)\[\/i\]/is',
    '/\[u\](.*?)\[\/u\]/is',
    '/\[s\](.*?)\[\/s\]/is',
    '/\[size\=(.*?)\](.*?)\[\/size\]/is',
    '/\[color\=(.*?)\](.*?)\[\/color\]/is',
    '/\[center\](.*?)\[\/center\]/is',
    '/\[font\=(.*?)\](.*?)\[\/font\]/is',
    '/\[align\=(left|center|right)\](.*?)\[\/align\]/is',
     
    '/\[url\](.*?)\[\/url\]/is',
    '/\[url\=(.*?)\](.*?)\[\/url\]/is',
    '/\[mail\=(.*?)\](.*?)\[\/mail\]/is',
    '/\[mail\](.*?)\[\/mail\]/is',
    '/\[img\](.*?)\[\/img\]/is',
    '/\[img\=(\d*?)x(\d*?)\](.*?)\[\/img\]/is',
    '/\[img (.*?)\](.*?)\[\/img\]/ise',
 
    '/\[quote\](.*?)\[\/quote\]/is',
    '/\[quote\=(.*?)\](.*?)\[\/quote\]/is',
    '/\[code\](.*?)\[\/code\]/is',
     
    '/\[sub\](.*?)\[\/sub\]/is',
    '/\[sup\](.*?)\[\/sup\]/is',
    '/\[p\](.*?)\[\/p\]/is',
     
    "/\[youtube\](.*?)\[\/youtube\]/i",
    "/\[gvideo\](.*?)\[\/gvideo\]/i",
     
    // "Specials", XHTML-like BBC Repository
    '/\[bull \/\]/i',
        '/\[copyright \/\]/i',
        '/\[registered \/\]/i',
        '/\[tm \/\]/i',
  );
   
  private static $simple_replace = array(
    '<strong>$1</strong>',
    '<em>$1</em>',
    '<u>$1</u>',          // you can also use: '<span style="text-decoration: underline;">$1</span>'
    '<del>$1</del>',      // you can also use: '<span style="text-decoration: line-through;">$1</span>'
    '<span style="font-size: $1;">$2</span>',
    '<span style="color: $1;">$2</span>',
    '<div style="text-align: center;">$1</div>',
    '<span style="font-family: $1;">$2</span>',
    '<div style="text-align: $1;">$2</div>',
     
    '<a href="$1">$1</a>',
    '<a href="$1">$2</a>',
    '<a href="mailto:$1">$2</a>',
    '<a href="mailto:$1">$1</a>',
    '<img src="$1" alt="" />',
    '<img height="$2" width="$1" alt="" src="$3" />',
    '"<img " . str_replace("&#039;", "\"",str_replace("&quot;", "\"", "$1")) . " src=\"$2\" />"',   // we replace &quot; and &#039; to " in case if we got string converted to html entities
 
    '<blockquote>$1</blockquote>',                              // you can also use: '<div class="quote">$1</div>'
    '<blockquote><strong>$1 wrote:</strong> $2</blockquote>',   // you can also use: '<div class="quote"><strong>$1 wrote:</strong> $2</div>
    '<pre>$1</pre>',
     
    '<sub>$1</sub>',
    '<sup>$1</sup>',
    '<p>$1</p>',
     
    "<object width=\"425\" height=\"350\"><embed src=\"http://www.youtube.com/v/$1\" type=\"application/x-shockwave-flash\" width=\"425\" height=\"350\"></embed></object>",
    "<embed src=\"http://video.google.com/googleplayer.swf?docId=$1\" type=\"application/x-shockwave-flash\" style=\"width: 425px; height: 350px;\">",
     
    // "Specials", XHTML-like BBC Repository
    '&bull;',
        '&copy;',
        '&reg;',
        '&trade;',
  );
   
  private static $lineBreaks_search = array(
      // [list]
      //'/\<br \/\>\s*\[list(.*?)\]/i',     // uncomment to remove <br /> before the tag
      '/\[list(.*?)\](.+?)\[\/list\]/sie',
      '/\[\/list\]\s*\<br \/\>/i',
       
      // [code]
      //'/\<br \/\>\s*\[code\]/i',          // uncomment to remove <br /> before the tag
      '/\[code\](.+?)\[\/code\]/sie',
      '/\[\/code\]\s*\<br \/\>/i',
       
      // [quote]
      //'/\<br \/\>\s*\[quote(.*?)\]/i',    // uncomment to remove <br /> before the tag
      '/\[\/quote\]\s*\<br \/\>/i',
       
      // [p]
      //'/\<br \/\>\s*\[p\]/i',             // uncomment to remove <br /> before the tag
      '/\[\/p\]\s*\<br \/\>/i',
       
      // [center]
      //'/\<br \/\>\s*\[center\]/i',        // uncomment to remove <br /> before the tag
      '/\[\/center\]\s*\<br \/\>/i',
       
      // [align]
      //'/\<br \/\>\s*\[align(.*?)\]/i',    // uncomment to remove <br /> before the tag
      '/\[\/align\]\s*\<br \/\>/i',
    );
     
    private static $lineBreaks_replace = array(
      // [list]
      //"\n[list$1]",         // uncomment to remove <br /> before the tag
      "'[list$1]'.str_replace('<br />', '', '$2').'[/list]'",
      "[/list]",
       
      // [code]
      //"\n[code]",           // uncomment to remove <br /> before the tag
      "'[code]'.str_replace('<br />', '', '$1').'[/code]'",
      "[/code]",
       
      // [quote]
      //"\n[quote$1]",        // uncomment to remove <br /> before the tag
      "[/quote]",
       
      // [p]
      //"\n[p]",              // uncomment to remove <br /> before the tag
      "[/p]",
       
      // [center]
      //"\n[center]",         // uncomment to remove <br /> before the tag
      "[/center]",
       
      // [align]
      //"\n[align$1]",        // uncomment to remove <br /> before the tag
      "[/align]",
    );
 
  private static function process_list_items($list_items) {
    $result_list_items = array();
     
    // Check for [li][/li] tags
    preg_match_all("/\[li\](.*?)\[\/li\]/is", $list_items, $li_array);
    $li_array = $li_array[1];
     
    if (empty($li_array)) {
        // we didn't find any [li] tags
        $list_items_array = explode("[*]", $list_items);
        foreach ($list_items_array as $li_text) {
            $li_text = trim($li_text);
            if (empty($li_text)) {
                continue;
            }
            $li_text = nl2br($li_text);
            $result_list_items[] = '<li>'.$li_text.'</li>';
        }
    } else {
        // we found [li] tags!
        foreach ($li_array as $li_text) {
            $li_text = nl2br($li_text);
            $result_list_items[] = '<li>'.$li_text.'</li>';
        }
    }
     
    $list_items = implode("\n", $result_list_items);
     
    return $list_items;
  }
   
  /*
  ARGUMENTS :
  $string = the text you want to format
  */
  /*
    It is recomended to do $string = htmlentities($string) before calling parse
  */
  public static function parse($string) {
     
    $s = (string) $string;
     
    if (empty($s)) {
      return '';
    }
     
    // Preappend http:// to url address if not present
    $s = preg_replace('/\[url\=([^(http)].+?)\](.*?)\[\/url\]/i', '[url=http://$1]$2[/url]', $s);
    $s = preg_replace('/\[url\]([^(http)].+?)\[\/url\]/i', '[url=http://$1]$1[/url]', $s);
     
    // Add line breaks
    $s = nl2br($s);
     
    // Remove the trash made by previous 
    $s = preg_replace(self::$lineBreaks_search, self::$lineBreaks_replace, $s);
     
    // Parse bbcode
    $s = preg_replace(self::$simple_search, self::$simple_replace, $s);
 
    // Parse [list] tags
    $s = preg_replace('/\[list\](.*?)\[\/list\]/sie', '"<ul>\n".self::process_list_items("$1")."\n</ul>"', $s);
    $s = preg_replace('/\[list\=(disc|circle|square|decimal|decimal-leading-zero|lower-roman|upper-roman|lower-greek|lower-alpha|lower-latin|upper-alpha|upper-latin|hebrew|armenian|georgian|cjk-ideographic|hiragana|katakana|hiragana-iroha|katakana-iroha|none)\](.*?)\[\/list\]/sie',
                '"<ol style=\"list-style-type: $1;\">\n".self::process_list_items("$2")."\n</ol>"', $s);
     
    return $s;
  }
 
}