added simple math and charts modules

vendor/andileco/eval-math/src/MethodsRegistry.php

@@ -0,0 +1,66 @@
+<?php
+/**
+ * @author Serge Rodovnichenko <serge@syrnik.com>
+ * @copyright Serge Rodovnichenko, 2019
+ * @license BSD 2.0
+ */
+
+namespace Andileco\Util\EvalMath;
+
+
+use ArrayAccess;
+use Countable;
+use RuntimeException;
+use Andileco\Util\EvalMath\Methods\AbstractMethod;
+
+class MethodsRegistry implements ArrayAccess, Countable
+{
+    protected $methods = [];
+
+    public function set(AbstractMethod $method)
+    {
+        $this->methods[$method->getName()] = clone $method;
+        return $this;
+    }
+
+    public function unsetByName($name)
+    {
+        unset($this->methods[$name]);
+        return $this;
+    }
+
+    /**
+     * @param $name
+     * @return AbstractMethod|null
+     */
+    public function findByName($name)
+    {
+        return (isset($this->methods[$name]) and $this->methods[$name] instanceof AbstractMethod) ? $this->methods[$name] : null;
+    }
+
+    public function offsetExists($offset): bool
+    {
+        return isset($this->methods[$offset]);
+    }
+
+    public function offsetGet($offset): mixed
+    {
+        $m = $this->findByName($offset);
+        return $m ? $m->getArgumentCount() : null;
+    }
+
+    public function offsetSet($offset, $value): void
+    {
+        throw new RuntimeException('Use set() method instead');
+    }
+
+    public function offsetUnset($offset): void
+    {
+        $this->unsetByName($offset);
+    }
+
+    public function count(): int
+    {
+        return count($this->methods);
+    }
+}