add recurring object

src/Recurring.php

@@ -0,0 +1,81 @@
+<?php
+/**
+ *
+ */
+
+namespace DavidBadura\Taskwarrior;
+
+/**
+ * @author David Badura <d.a.badura@gmail.com>
+ */
+class Recurring
+{
+    const DAILY = 'daily';
+    const WEEKDAYS = 'weekdays';
+    const WEEKLY = 'weekly';
+    const BIWEEKLY = 'biweekly';
+    const QUARTERLY = 'quarterly';
+    const SEMIANNUAL = 'semiannual';
+    const ANNUAL = 'annual';
+    const YEARLY = 'yearly';
+    const BIANNUAL = 'biannual';
+    const BIYEARLY = 'biyearly';
+
+    /**
+     * @var string
+     */
+    private $recurring;
+
+    /**
+     * @param string $recurring
+     * @throws TaskwarriorException
+     */
+    public function __construct($recurring)
+    {
+        if ($this->isValid($recurring)) {
+            $this->recurring = $recurring;
+        } else {
+            throw new TaskwarriorException();
+        }
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->recurring;
+    }
+
+    /**
+     * @param string $recur
+     * @return bool
+     */
+    private function isValid($recur)
+    {
+        $refClass = new \ReflectionClass(__CLASS__);
+        $constants = $refClass->getConstants();
+
+        if (in_array($recur, $constants)) {
+            return true;
+        }
+
+        if (preg_match('/^[0-9]+d$/', $recur)) {
+            return true;
+        }
+
+        if (preg_match('/^[0-9]+w$/', $recur)) {
+            return true;
+        }
+
+        if (preg_match('/^[0-9]+q$/', $recur)) {
+            return true;
+        }
+
+        if (preg_match('/^[0-9]+y$/', $recur)) {
+            return true;
+        }
+
+        return false;
+    }
+}