Revamp Configuration classes, breaking backwards configuration compatibility (not that there was much to broken to begin with). Fix bug involving PHP 4 object typecasting.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@203 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/ConfigDef.php

@@ -0,0 +1,48 @@
+<?php
+
+class HTMLPurifier_ConfigDef {
+    
+    var $info = array();
+    
+    function initialize() {
+        $this->defineNamespace('Core', 'Core features that are always available.');
+        $this->defineNamespace('Attr', 'Features regarding attribute validation.');
+    }
+    
+    function &instance($prototype = null) {
+        static $instance;
+        if ($prototype !== null) {
+            $instance = $prototype;
+        } elseif ($instance === null || $prototype === true) {
+            $instance = new HTMLPurifier_ConfigDef();
+            $instance->initialize();
+        }
+        return $instance;
+    }
+    
+    function define($namespace, $name, $default, $description) {
+        $def =& HTMLPurifier_ConfigDef::instance();
+        if (!isset($def->info[$namespace])) {
+            trigger_error('Cannot define directive for undefined namespace',
+                E_USER_ERROR);
+            return;
+        }
+        if (isset($def->info[$namespace][$name])) {
+            trigger_error('Cannot redefine directive', E_USER_ERROR);
+            return;
+        }
+        $def->info[$namespace][$name] = $default;
+    }
+    
+    function defineNamespace($namespace, $description) {
+        $def =& HTMLPurifier_ConfigDef::instance();
+        if (isset($def->info[$namespace])) {
+            trigger_error('Cannot redefine namespace', E_USER_ERROR);
+            return;
+        }
+        $def->info[$namespace] = array();
+    }
+    
+}
+
+?>