Merge branch 'ng' of https://github.com/neonxp/MathExecutor into neonxp-ng

# Conflicts:
#	src/NXP/Classes/Calculator.php
#	src/NXP/Classes/Lexer.php
#	src/NXP/Classes/Token/AbstractOperator.php
#	src/NXP/Classes/TokenFactory.php
#	src/NXP/MathExecutor.php

1 files changed, 63 insertions, 0 deletions

diff --git a/src/NXP/Classes/CustomFunction.php b/src/NXP/Classes/CustomFunction.php
new file mode 100644
index 0000000..944f7d9
--- /dev/null
+++ b/src/NXP/Classes/CustomFunction.php
@@ -0,0 +1,63 @@
+<?php
+
+
+namespace NXP\Classes;
+
+
+use NXP\Exception\IncorrectExpressionException;
+use ReflectionException;
+use ReflectionFunction;
+
+class CustomFunction
+{
+    /**
+     * @var string
+     */
+    public $name;
+
+    /**
+     * @var callable $function
+     */
+    public $function;
+
+    /**
+     * @var int
+     */
+    public $places;
+
+    /**
+     * CustomFunction constructor.
+     * @param string $name
+     * @param callable $function
+     * @param int $places
+     * @throws ReflectionException
+     */
+    public function __construct(string $name, callable $function, $places = null)
+    {
+        $this->name = $name;
+        $this->function = $function;
+        if ($places === null) {
+            $reflection = new ReflectionFunction($function);
+            $this->places = $reflection->getNumberOfParameters();
+        } else {
+            $this->places = $places;
+        }
+    }
+
+    public function execute(&$stack)
+    {
+        if (count($stack) < $this->places) {
+            throw new IncorrectExpressionException();
+        }
+        $args = [];
+        for ($i = 0; $i < $this->places; $i++) {
+            array_unshift($args, array_pop($stack)->value);
+        }
+
+        $result = call_user_func_array($this->function, $args);
+
+        return new Token(Token::Literal, $result);
+    }
+
+
+}
\ No newline at end of file