Merge pull request #10 from aneasystone/master

Support for strikethrough, same as GFM

markdown_extended.php

@@ -18,7 +18,9 @@ function MarkdownExtraExtended_Parser($default_classes = array()) {
 		$this->block_gamut += array(
 			"doFencedFigures" => 7,
 		);
-
+		$this->span_gamut += array(
+			"doStrikethroughs" => -35
+		);
 		parent::MarkdownExtra_Parser();
 	}
 
@@ -157,5 +159,19 @@ function _doFencedFigures_callback($matches) {
 		$res .= "</figure>";		
 		return "\n". $this->hashBlock($res)."\n\n";
 	}
+	function doStrikethroughs($text) {
+	#
+	# Replace ~~some deleted text~~ with <del>some deleted text</del>
+	#
+		$text = preg_replace_callback('{
+				~~([^~]+)~~
+			}xm',
+			array(&$this, '_doStrikethroughs_callback'), $text);
+		return $text;
+	}
+	function _doStrikethroughs_callback($matches) {
+		$res = "<del>" . $matches[1] . "</del>";
+		return $this->hashBlock($res);
+	}
 }
 ?>