1: <?php
  2: class BBCodeParser {
  3: 
  4:     private $objTokens;
  5: 
  6:     public function __construct($strText) {
  7:         $strText = str_replace(array("\n", "\r\n", "\r"), "\n", $strText);
  8: 
  9:         $objLexer = new QLexer();
 10: 
 11:         // Build the rules
 12:         // Bold - input looks like "[b]hello[/b]"
 13:         $objLexer->addEntryPattern("\[b\]", "start_bold", QLexer::DefaultMode, "bold");
 14:         $objLexer->addExitPattern("\[/b\]", "end_bold", "bold", QLexer::DefaultMode);
 15: 
 16:         // Italic - input looks like "[i]foo[/i]"
 17:         $objLexer->addEntryPattern("\[i\]", "start_italic", QLexer::DefaultMode, "italic");
 18:         $objLexer->addExitPattern("\[/i\]", "end_italic", "italic", QLexer::DefaultMode);
 19: 
 20:         // Line Break
 21:         // Save the pain of multiple line endings - varies depending on the platform
 22:         $objLexer->addPattern("\n", "line_break");
 23: 
 24:         // Code Block - look like
 25:         $objLexer->addEntryPattern("\[code\]", "start_code", QLexer::DefaultMode, "code");
 26:         $objLexer->addExitPattern("\[/code\]", "end_code", "code", QLexer::DefaultMode);
 27: 
 28:         // Image - input looks like "[img]http://www.foo.com/image.gif[/img]"
 29:         $objLexer->addEntryPattern("\[img\]", "start_img", QLexer::DefaultMode, "img");
 30:         $objLexer->addExitPattern("\[/img\]", "end_img", "img", QLexer::DefaultMode);
 31: 
 32:         // Link - input looks like "[url=http://example.com]My Site[/url]"
 33:         $objLexer->addEntryPattern("\[url=", "start_url", QLexer::DefaultMode, "url");
 34:         $objLexer->addExitPattern("\[/url\]", "end_url", "url", QLexer::DefaultMode);
 35: 
 36:         $this->objTokens = $objLexer->Tokenize($strText);
 37:     }
 38: 
 39:     private function renderRaw($strRaw) {
 40:         return strip_tags($strRaw);
 41:     }
 42: 
 43:     private function renderLink($objTokens) {
 44:         $objToken = array_shift($objTokens);
 45: 
 46:         $parts = explode("]", $objToken["raw"]);
 47:         $url = $parts[0];
 48:         $label = $parts[1];
 49:         return sprintf("<a href='%s'>%s</a>", $url, $label);
 50:     }
 51: 
 52:     private function renderImage($objTokens) {
 53:         $objToken = array_shift($objTokens);
 54:         return sprintf("<img src='%s' />", $objToken["raw"]);
 55:     }
 56: 
 57:     private function renderCode($objTokens) {
 58:         $strOut = "";
 59:         foreach ($objTokens as $objToken) {
 60:             if ($objToken["token"] != QLexer::UNMATCHED)
 61:                 continue;
 62:             $strOut .= highlight_string(stripslashes(trim($objToken["raw"])), true);
 63:         }
 64:         return $strOut;
 65:     }
 66: 
 67:     private function renderFormatting($objTokens, $type, $tag) {
 68:         $strOut = "";
 69:         foreach ($objTokens as $objToken) {
 70:             if ($objToken["token"] == "end_" . $type)
 71:                 break;
 72:             $strOut .= $this->renderRaw($objToken["raw"]);
 73:         }
 74: 
 75:         return sprintf("<%s>%s</%s>", $tag, $strOut, $tag);
 76:     }
 77: 
 78:     public function Render() {
 79:         $this->strOut = "";
 80: 
 81:         foreach ($this->objTokens as $objToken) {
 82:             switch ($objToken['token']) {
 83:                 case QLexer::UNMATCHED:
 84:                     $this->strOut .= $this->renderRaw($objToken['raw']);
 85:                     break;
 86:                 case "start_bold":
 87:                     $this->strOut .= $this->renderFormatting($objToken['raw'], "bold", "strong");
 88:                     break;
 89:                 case "start_italic":
 90:                     $this->strOut .= $this->renderFormatting($objToken['raw'], "italic", "em");
 91:                     break;
 92:                 case "line_break":
 93:                     $this->strOut .= "<br />";
 94:                     break;
 95:                 case "start_code":
 96:                     $this->strOut .= $this->renderCode($objToken["raw"]);
 97:                     break;
 98:                 case "start_url":
 99:                     $this->strOut .= $this->renderLink($objToken["raw"]);
100:                     break;
101:                 case "start_img":
102:                     $this->strOut .= $this->renderImage($objToken["raw"]);
103:                     break;
104:                 default:
105:                     $this->strOut .= "#unmatched_token#";
106:                     break;
107:             }
108:         }
109: 
110:         return $this->strOut;
111:     }
112: }
113: ?>