From f68e9c85901c788dece107f52cf4e79c6ac62a57 Mon Sep 17 00:00:00 2001
From: Arnold Daniels <arnold@jasny.net>
Date: Thu, 14 Jul 2016 16:15:50 +0200
Subject: [PATCH] Ability to set default functions for transform processor

Set `Processor\Transform::$defaultFunctions` to configure (custom) allowed functions
---
 src/DataEnricher/Processor/Transform.php | 45 +++++++++++++++++-------
 1 file changed, 32 insertions(+), 13 deletions(-)

diff --git a/src/DataEnricher/Processor/Transform.php b/src/DataEnricher/Processor/Transform.php
index 5059946..397ad49 100644
--- a/src/DataEnricher/Processor/Transform.php
+++ b/src/DataEnricher/Processor/Transform.php
@@ -13,19 +13,37 @@ class Transform implements Processor
     use Processor\Implementation;
     
     /**
-     * Allowed transformation functions
-     * @var type 
+     * Default transformation functions
+     * @var array
      */
-    public $allowed = [
-        'hash',
-        'base64_encode',
-        'base64_decode',
-        'json_encode',
-        'json_decode',
-        'serialize',
-        'unserialize'
+    public static $defaultFunctions = [
+        'hash' => 'hash',
+        'base64_encode' => 'base64_encode',
+        'base64_decode' => 'base64_decode',
+        'json_encode' => 'json_encode',
+        'json_decode' => 'json_decode',
+        'serialize' => 'serialize',
+        'unserialize' => 'unserialize'
     ];
     
+    /**
+     * Allowed transformation functions
+     * @var array 
+     */
+    public $functions;
+    
+    
+    /**
+     * Class constructor
+     * 
+     * @param string $property  Property key with the processing instruction
+     */
+    public function __construct($property)
+    {
+        $this->property = $property;
+        $this->functions = static::$defaultFunctions;
+    }
+    
     /**
      * Apply processing to a single node
      * 
@@ -46,14 +64,15 @@ public function applyToNode(Node $node)
         }
         
         foreach ($transformations as $transformation) {
-            list($fn, $arg) = explode(':', $transformation) + [null];
+            list($key, $arg) = explode(':', $transformation) + [null];
             
-            if (!in_array($fn, $this->allowed)) {
+            if (!isset($this->functions[$key])) {
                 trigger_error("Unknown transformation '$transformation'", E_USER_WARNING);
                 continue;
             }
             
-            $value = isset($arg) ? $fn($arg, $value) : $fn($value);
+            $fn = $this->functions[$key];
+            $value = isset($arg) ? call_user_func($fn, $arg, $value) : call_user_func($fn, $value);
         }
         
         $node->setResult($value);