[1.7.0] Factor out caching of definitions to DefinitionCache, hook in CSS, add a bunch of todos for this functionality. Attr namespace no longer affects HTMLDefinition.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1093 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/DefinitionCache/Serializer.php

@@ -0,0 +1,64 @@
+<?php
+
+require_once 'HTMLPurifier/DefinitionCache.php';
+
+class HTMLPurifier_DefinitionCache_Serializer extends
+      HTMLPurifier_DefinitionCache
+{
+    
+    function add($def, $config) {
+        $file = $this->generateFilePath($config);
+        if (file_exists($file)) return false;
+        return $this->_write($file, serialize($def));
+    }
+    
+    function set($def, $config) {
+        $file = $this->generateFilePath($config);
+        return $this->_write($file, serialize($def));
+    }
+    
+    function get($config) {
+        $file = $this->generateFilePath($config);
+        if (!file_exists($file)) return false;
+        return unserialize(file_get_contents($file));
+    }
+    
+    function remove($config) {
+        $file = $this->generateFilePath($config);
+        if (!file_exists($file)) return false;
+        return unlink($file);
+    }
+    
+    /**
+     * Generates the file path to the serial file corresponding to
+     * the configuration and definition name
+     */
+    function generateFilePath($config) {
+        $key = $this->generateKey($config);
+        return dirname(__FILE__) . '/Serializer/' . $this->type . '/' . $key . '.ser';
+    }
+    
+    /**
+     * Convenience wrapper function for file_put_contents
+     * @param $file File name to write to
+     * @param $data Data to write into file
+     * @return Number of bytes written if success, or false if failure.
+     */
+    function _write($file, $data) {
+        static $file_put_contents;
+        if ($file_put_contents === null) {
+            $file_put_contents = function_exists('file_put_contents');
+        }
+        if ($file_put_contents) {
+            return file_put_contents($file, $data);
+        }
+        $fh = fopen($file, 'w');
+        if (!$fh) return false;
+        $status = fwrite($fh, $contents);
+        fclose($fh);
+        return $status;
+    }
+    
+}
+
+?>