Add first valid expression ruler. Still not linked to scheduleds.

controllers/internals/Ruler.php

@@ -0,0 +1,75 @@
+<?php
+
+/*
+ * This file is part of RaspiSMS.
+ *
+ * (c) Pierre-Lin Bonnemaison <plebwebsas@gmail.com>
+ *
+ * This source file is subject to the GPL-3.0 license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+namespace controllers\internals;
+use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
+use Symfony\Component\ExpressionLanguage\ExpressionFunction;
+
+    /**
+     * Class to analyse rules used by conditional groups
+     */
+    class Ruler extends \descartes\InternalController
+    {
+        private $expression_language;
+
+        /**
+         * Constructor
+         */
+        public function __construct ()
+        {
+            $this->expression_language = new ExpressionLanguage();
+
+            //Add custom functions
+            $this->expression_language->registerProvider(new ExpressionProvider());
+        }
+
+
+        /**
+         * Verify if a condition is valid. i.e we can evaluate it without error.
+         * @param string $condition : The condition to evaluate.
+         * @param array $datas : The datas to made available to condition
+         * @return bool : false if invalid, true else
+         */
+        public function validate_condition (string $condition, array $datas = []) : bool
+        {
+            try 
+            {
+                $this->expression_language->evaluate($condition, $datas);
+                return true;
+            }
+            catch (\Exception $e)
+            {
+                echo "Error : ";
+                echo $e->getMessage();
+                return false;
+            } 
+        }
+        
+        
+        /**
+         * Evaluate a condition
+         * @param string $condition : The condition to evaluate.
+         * @param array $datas : The datas to made available to condition
+         * @return ?bool : false if invalid, true else, null only on error
+         */
+        public function evaluate_condition (string $condition, array $datas = []) : ?bool
+        {
+            try 
+            {
+                $result = $this->expression_language->evaluate($condition, $datas);
+                return (bool) $result;
+            }
+            catch (\Exception $e)
+            {
+                return null;
+            } 
+        }
+    }