Tidy filter from Hannes Gassert <hannes at mediagonal dot ch>

If you have Tidy installed as part of your PHP, you can use this
filter to convert all user text into XHTML on the fly.

diff --git a/filter/tidy/filter.php b/filter/tidy/filter.php
new file mode 100644 (file)
index 0000000..d96c009
--- /dev/null
+++ b/filter/tidy/filter.php
@@ -0,0 +1,47 @@
+<?php
+      
+// This function looks for text including markup and
+// applies tidy's repair function to it.
+// Tidy is a HTML clean and
+// repair utility, which is currently available for PHP 4.3.x and PHP 5 as a
+// PECL extension from http://pecl.php.net/package/tidy, in PHP 5 you need only
+// to compile using the --with-tidy option.
+// If you don't have the tidy extension installed or don't know, you can enable  
+// or disable this filter, it just won't have any effect.
+// If you want to know what you can set in $tidyoptions and what their default
+// values are, see http://php.net/manual/en/function.tidy-get-config.php.
+      
+/**
+* @author Hannes Gassert <hannes at mediagonal dot ch>
+* @param        int            course id
+* @param        string         text to be filtered
+*/
+function tidy_filter($courseid, $text) {
+       
+/// Configuration for tidy. Feel free to tune for your needs, e.g. to allow
+/// proprietary markup.
+    $tidyoptions = array(             
+             'output-xhtml' => true,
+             'show-body-only' => true,
+             'tidy-mark' => false,
+             'drop-proprietary-attributes' => true,
+             'drop-font-tags' => true,
+             'drop-empty-paras' => true,
+             'indent' => true,
+             'quiet' => true,
+    );
+    
+/// Do a quick check using strpos to avoid unnecessary work
+    if (strpos($text, '<') === false) {
+        return $text;
+    }
+
+    
+/// If enabled: run tidy over the entire string
+    if (function_exists('tidy_repair_string')){
+        $text = tidy_repair_string($text, $tidyoptions);
+    }
+
+    return $text;
+}
+?>