Subclass of MardownExtra added with Geshi support (syntax highlighting)

Michelf/MarkdownExtraGeshi.inc.php

@@ -0,0 +1,13 @@
+<?php
+
+# Use this file if you cannot use class autoloading. It will include all the
+# files needed for the MarkdownExtraGeshi parser.
+#
+# Take a look at the PSR-0-compatible class autoloading implementation
+# in the Readme.php file if you want a simple autoloader setup.
+
+require_once dirname(__FILE__) . '/MarkdownInterface.php';
+require_once dirname(__FILE__) . '/Markdown.php';
+require_once dirname(__FILE__) . '/MarkdownExtra.php';
+require_once dirname(__FILE__) . '/MarkdownExtraGeshi.php';
+

Michelf/MarkdownExtraGeshi.php

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+<?php
+#
+# Markdown Extra Geshi -  A text-to-HTML conversion tool for web writers
+#
+# PHP Markdown Extra Geshi
+# Copyright (c) 2015 Mario Konrad
+#
+# PHP Markdown Extra
+# Copyright (c) 2004-2015 Michel Fortin  
+# <https://michelf.ca/projects/php-markdown/>
+#
+# Original Markdown
+# Copyright (c) 2004-2006 John Gruber  
+# <http://daringfireball.net/projects/markdown/>
+#
+namespace Michelf;
+
+require_once("geshi.php");
+
+#
+# Markdown Extra Geshi Parser Class
+#
+
+class MarkdownExtraGeshi extends \Michelf\MarkdownExtra {
+
+	protected function doFencedCodeBlocks($text) {
+	#
+	# Adding the fenced code block syntax to regular Markdown:
+	#
+	# ~~~
+	# Code block
+	# ~~~
+	#
+	# also possible to state a language for syntax highlighting:
+	#
+	# ~~~ cpp
+	# Code block
+	# ~~~
+	#
+	# optional starting line number:
+	#
+	# ~~~ cpp:22
+	# Code block
+	# ~~~
+	#
+		$less_than_tab = $this->tab_width;
+
+		$text = preg_replace_callback('{
+				(?:\n|\A)
+				# 1: Opening marker
+				(
+					(?:~{3,}|`{3,}) # 3 or more tildes/backticks.
+				)
+				[ ]*
+				(?:
+					([a-zA-Z0-9]+) # 2: language name
+				|
+					([a-zA-Z0-9]+:[1-9][0-9]*) # 3: language name and line number
+				)?
+				[ ]* \n # Whitespace and newline following marker.
+
+				# 4: Content
+				(
+					(?>
+						(?!\1 [ ]* \n)	# Not a closing marker.
+						.*\n+
+					)+
+				)
+
+				# Closing marker.
+				\1 [ ]* (?= \n )
+			}xm',
+			array($this, '_doFencedCodeBlocks_geshi_callback'), $text);
+
+		return $text;
+	}
+
+	protected function _doFencedCodeBlocks_geshi_callback($matches) {
+		$language =& $matches[2];
+		$codeblock = $matches[4];
+		$codeblock = preg_replace_callback('/^\n+/',
+			array($this, '_doFencedCodeBlocks_newlines'), $codeblock);
+
+		if ($language == "") {
+			$language =& $matches[3];
+		}
+
+		$linenumber = "1";
+		if ($language != "") {
+			$attrs = preg_split("/:/", $language);
+			if (count($attrs) > 0) {
+				$language = $attrs[0];
+			}
+			if (count($attrs) > 1) {
+				$linenumber = $attrs[1];
+			}
+		}
+
+		$geshi = new \Geshi($codeblock, $language);
+		$geshi->enable_line_numbers(GESHI_NORMAL_LINE_NUMBERS);
+		$geshi->start_line_numbers_at($linenumber);
+		$codeblock = $geshi->parse_code();
+		return "\n\n".$this->hashBlock($codeblock)."\n\n";
+	}
+}
+