NEW: Github style code fence blocks. (Fixes #22)

code/DocumentationParser.php

@@ -1,24 +1,32 @@
 <?php
 
 /**
- * Parser wrapping the Markdown Extra parser (see http://michelf.com/projects/php-markdown/extra/). 
+ * Parser wrapping the Markdown Extra parser.
+ * 
+ * @see http://michelf.com/projects/php-markdown/extra/
  *
  * @package docsviewer
  */
 class DocumentationParser {
 
-	/**
+	const CODE_BLOCK_BACKTICK = 1;
-	 * @var String Rewriting of api links in the format "[api:MyClass]" or "[api:MyClass::$my_property]".
+	const CODE_BLOCK_COLON = 2;
-	 */
-	static $api_link_base = 'http://api.silverstripe.org/search/lookup/?q=%s&version=%s&module=%s';
 
-	static $heading_counts = array();
+	/**
+	 * @var string Rewriting of api links in the format "[api:MyClass]" or "[api:MyClass::$my_property]".
+	 */
+	public static $api_link_base = 'http://api.silverstripe.org/search/lookup/?q=%s&version=%s&module=%s';
+	
+	/**
+	 * @var array
+	 */
+	public static $heading_counts = array();
 	
 	/**
 	 * Parse a given path to the documentation for a file. Performs a case 
 	 * insensitive lookup on the file system. Automatically appends the file 
 	 * extension to one of the markdown extensions as well so /install/ in a
-	 * web browser will match /install.md or /INSTALL.md
+	 * web browser will match /install.md or /INSTALL.md.
 	 * 
 	 * Filepath: /var/www/myproject/src/cms/en/folder/subfolder/page.md
 	 * URL: http://myhost/mywebroot/dev/docs/2.4/cms/en/folder/subfolder/page
@@ -27,8 +35,9 @@ class DocumentationParser {
 	 * Pathparts: folder/subfolder/page
 	 * 
 	 * @param DocumentationPage $page
-	 * @param String $baselink Link relative to webroot, up until the "root" of the module.  
+	 * @param String $baselink Link relative to webroot, up until the "root" 
-	 *  Necessary to rewrite relative links
+	 *							of the module. Necessary to rewrite relative 
+	 *							links
 	 *
 	 * @return String
 	 */
@@ -56,38 +65,110 @@ class DocumentationParser {
 	public static function rewrite_code_blocks($md) {
 		$started = false;
 		$inner = false;
+		$mode = false;
+		$end = false;
 
 		$lines = explode("\n", $md);
+		$output = array();
+
 		foreach($lines as $i => $line) {
 			if(!$started && preg_match('/^\t*:::\s*(.*)/', $line, $matches)) {
 				// first line with custom formatting
 				$started = true;
-				$lines[$i] = sprintf('<pre class="brush: %s">', $matches[1]);
+				$mode = self::CODE_BLOCK_COLON;
-			} elseif(preg_match('/^\t(.*)/', $line, $matches)) {
+				$output[$i] = sprintf('<pre class="brush: %s">', (isset($matches[1])) ? $matches[1] : "");
-				// inner line of ::: block, or first line of standard markdown code block
+			} 
+			elseif(!$started && preg_match('/^\t*```\s*(.*)/', $line, $matches)) {
+				$started = true;
+				$mode = self::CODE_BLOCK_BACKTICK;
+				$output[$i] = sprintf('<pre class="brush: %s">', (isset($matches[1])) ? $matches[1] : "");
+			} 
+			elseif($started && $mode == self::CODE_BLOCK_BACKTICK) {
+				// inside a backtick fenced box
+				if(preg_match('/^\t*```\s*/', $line, $matches)) {
+					// end of the backtick fenced box. Unset the line that contains the backticks
+					$end = true;
+				}
+				else {
+					// still inside the line.
+					$output[$i] = ($started) ? '' : '<pre>' . "\n";
+					$output[$i] .= htmlentities($line, ENT_COMPAT, 'UTF-8');
+					$inner = true;
+				}
+			} 
+			elseif(preg_match('/^\t(.*)/', $line, $matches)) {
+				// inner line of block, or first line of standard markdown code block
 				// regex removes first tab (any following tabs are part of the code).
-				$lines[$i] = ($started) ? '' : '<pre>' . "\n";
+				$output[$i] = ($started) ? '' : '<pre>' . "\n";
-				$lines[$i] .= htmlentities($matches[1], ENT_COMPAT, 'UTF-8');
+				$output[$i] .= htmlentities($matches[1], ENT_COMPAT, 'UTF-8');
 				$inner = true;
 				$started = true;
-			} elseif($started && $inner) {
+			}
-				// remove any previous blank lines
+			elseif($started && $inner && $mode == self::CODE_BLOCK_COLON && trim($line) === "") {
-				$j = $i-1;
+				// still inside a colon based block, if the line is only whitespace 
-				while(isset($lines[$j]) && preg_match('/^[\t\s]*$/', $lines[$j])) {
+				// then continue with  with it. We can continue with it for now as 
-					unset($lines[$j]);
+				// it'll be tidied up later in the $end section.
+				$inner = true;
+				$output[$i] = $line;
+			}
+			elseif($started && $inner) {
+				// line contains something other than whitespace, or tabbed. E.g
+				// 	> code
+				//	> \n
+				//	> some message
+				//
+				// So actually want to reset $i to the line before this new line
+				// and include this line. The edge case where this will fail is
+				// new the following segment contains a code block as well as it
+				// will not open.
+				$end = true;
+				$output[$i] = $line;
+				$i = $i -1;
+			}
+			else {
+				$output[$i] = $line;
+			}
+
+			if($end) {
+				$output = self::finalize_code_output($i, $output);
+
+				// reset state
+				$started = $inner = $mode = $end = false;
+			}
+		}
+
+		if($started) {
+			$output = self::finalize_code_output($i, $output);
+		}
+
+		return join("\n", $output);
+
+	}
+
+	/**
+	 * @param int
+	 * @param array
+	 *
+	 * @return array
+	 */
+	private static function finalize_code_output($i, $output) {
+		$j = $i;
+
+		while(isset($output[$j]) && trim($output[$j]) === "") {
+			unset($output[$j]);
+		
 			$j--;
 		}
 				
-				// last line, close pre
+		if(isset($output[$j])) {
-				$lines[$i] = '</pre>' . "\n\n" . $line;
+			$output[$j] .= "</pre>\n";
-				
-				// reset state
-				$started = $inner = false;
-			}
 		}
 
-		return join("\n", $lines);
+		else {
+			$output[$j] = "</pre>\n\n";
+		}
 
+		return $output;				
 	}
 	
 	static function rewrite_image_links($md, $page) {

docs/en/Syntax-Highlighting.md

@@ -3,19 +3,13 @@
 The custom Markdown parser can render custom prefixes for code blocks, and 
 render it via a [javascript syntax highlighter](http://alexgorbatchev.com/SyntaxHighlighter).
 
-In:
+To see examples of the syntax, check out the source of this file in docs/en/
-
-	:::php
-	my sourcecode
-	
-Out:
-
-	<pre class="brush: php">
-	my sourcecode
-	</pre>
 
 To include the syntax highlighter source, add the following to your `DocumentationViewer->init()`:
 
+
+```php
+
 Requirements::javascript(THIRDPARTY_DIR .'/jquery/jquery.js');
 Requirements::javascript('sapphiredocs/thirdparty/syntaxhighlighter/scripts/shCore.js');
 Requirements::javascript('sapphiredocs/thirdparty/syntaxhighlighter/scripts/shBrushJScript.js');
@@ -38,6 +32,7 @@ To include the syntax highlighter source, add the following to your `Documentati
 Requirements::css('sapphiredocs/thirdparty/syntaxhighlighter/styles/shCore.css');
 Requirements::css('sapphiredocs/thirdparty/syntaxhighlighter/styles/shCoreDefault.css');
 Requirements::css('sapphiredocs/thirdparty/syntaxhighlighter/styles/shThemeRDark.css');
+```
 
 You can overload the `DocumentationViewer` class and add a custom route through `Director::addRule()`
 if you prefer not to modify the module file.

lang/en.yml

@@ -0,0 +1,19 @@
+en:
+  DocumentationSearch:
+    SEARCH: Search
+    SEARCHRESULTS: 'Search Results'
+  DocumentationViewer:
+    CHANGE: Change
+    KEYWORDS: Keywords
+    LANGUAGE: Language
+    MODULES: Modules
+    OPENSEARCHDESC: 'Search the documentation'
+    OPENSEARCHNAME: 'Documentation Search'
+    OPENSEARCHTAGS: documentation
+    SEARCH: Search
+    VERSIONS: Versions
+  DocumentationViewer_home.ss:
+    DOCUMENTEDMODULES: 'Documented Modules'
+    NOMODULEDOCUMENTATION: 'No modules with documentation installed could be found.'
+  DocumentationViewer_results.ss:
+    ADVANCEDSEARCH: 'Advanced Search'

tests/DocumentationParserTest.php

@@ -26,21 +26,40 @@ code block
 with multiple
 lines
 	and tab indent
-	and escaped < brackets
+	and escaped &lt; brackets</pre>
-</pre>
 
 Normal text after code block
 HTML;
 
+
 		$this->assertContains($expected, $result, 'Custom code blocks with ::: prefix');		
 		
 		$expected = <<<HTML
 <pre>
 code block
-without formatting prefix
+without formatting prefix</pre>
-</pre>
 HTML;
 		$this->assertContains($expected, $result, 'Traditional markdown code blocks');
+
+		$expected = <<<HTML
+<pre class="brush: ">
+Fenced code block
+</pre>
+HTML;
+		$this->assertContains($expected, $result, 'Backtick code blocks');
+		
+		$expected = <<<HTML
+<pre class="brush: php">
+Fenced box with
+
+new lines in
+
+between
+
+content
+</pre>
+HTML;
+		$this->assertContains($expected, $result, 'Backtick with newlines');
 	}
 	
 	function testImageRewrites() {

tests/docs/en/test.md

@@ -25,6 +25,22 @@ Normal text after code block
 	code block
 	without formatting prefix
 
+```
+Fenced code block
+```
+
+Did the fence work?
+
+```php
+Fenced box with
+
+new lines in
+
+between
+
+content
+```
+
 # Heading one
 
 # Heading with custom anchor {#custom-anchor}