From fa48de33c2f6cefbac8bfec7cde75b75390d5f39 Mon Sep 17 00:00:00 2001
From: redmatrix <git@macgirvin.com>
Date: Wed, 15 Jun 2016 19:44:15 -0700
Subject: provide syntax based [colour] highlighting on code blocks for popular
 languages. I'm not happy with the line height on the list elements but
 couldn't see where this was defaulted. This uses the syntax [code=xxx]some
 code snippet[/code], where xxx represents a code/language style - with about
 18 builtins.

---
 include/bbcode.php | 14 ++++++++++++++
 include/text.php   | 38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+)

(limited to 'include')

diff --git a/include/bbcode.php b/include/bbcode.php
index 63a475779..3fc1e2ea4 100644
--- a/include/bbcode.php
+++ b/include/bbcode.php
@@ -491,6 +491,11 @@ function bb_code($match) {
 		return '<code class="inline-code">' . trim($match[1]) . '</code>';
 }
 
+function bb_highlight($match) {
+	if(in_array($match[1],['php','css','mysql','sql','abap','diff','html','perl','ruby',
+		'vbscript','avrc','dtd','java','xml','cpp','python','javascript','sh']))
+		return text_highlight($match[2],$match[1]);
+}
 
 
 	// BBcode 2 HTML was written by WAY2WEB.net
@@ -566,6 +571,15 @@ function bbcode($Text, $preserve_nl = false, $tryoembed = true, $cache = false)
 	$Text = str_replace(">", "&gt;", $Text);
 
 
+	// Check for [code] text here, before the linefeeds are messed with.
+	// The highlighter will unescape and re-escape the content.
+
+	if (strpos($Text,'[code=') !== false) {
+		$Text = preg_replace_callback("/\[code=(.*?)\](.*?)\[\/code\]/ism", 'bb_highlight', $Text);
+	}
+
+
+
 	// Convert new line chars to html <br /> tags
 
 	// nlbr seems to be hopelessly messed up
diff --git a/include/text.php b/include/text.php
index bd59aa732..7b43ece43 100644
--- a/include/text.php
+++ b/include/text.php
@@ -2881,3 +2881,41 @@ function flatten_array_recursive($arr) {
 	}
 	return($ret);
 }			
+
+function text_highlight($s,$lang) {
+
+	if(! strpos('Text_Highlighter',get_include_path())) {
+		set_include_path(get_include_path() . PATH_SEPARATOR . 'library/Text_Highlighter');
+		head_add_css('/library/Text_Highlighter/sample.css');	
+	}
+	require_once('library/Text_Highlighter/Text/Highlighter.php');
+    require_once('library/Text_Highlighter/Text/Highlighter/Renderer/Html.php');
+    $options = array(
+        'numbers' => HL_NUMBERS_LI,
+        'tabsize' => 4,
+    );
+	$tag_added = false;
+	$s = trim(html_entity_decode($s,ENT_COMPAT));
+	$s = str_replace("    ","\t",$s);
+	if($lang === 'php') {
+		if(strpos('<?php',$s) !== 0) {
+			$s = '<?php' . "\n" . $s;
+			$tag_added = true;			
+		}
+
+	} 
+    $renderer = new Text_Highlighter_Renderer_HTML($options);
+    $hl = Text_Highlighter::factory($lang);
+    $hl->setRenderer($renderer);
+	$o = $hl->highlight($s);
+	$o = str_replace("    ","&nbsp;&nbsp;&nbsp;&nbsp;",$o);
+
+	if($tag_added) {
+		$b = substr($o,0,strpos($o,'<li>'));
+		$e = substr($o,strpos($o,'</li>'));
+		$o = $b . $e;
+	}
+
+    return('<code>' . $o . '</code>');
+}
+
-- 
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