Mass refactoring

Some changes:
+ Added support of functions with multiple arguments
+ Added some default function (min, max, avg). just example of multiple arguments :)
- Removed variables support (I think they pointless)
~ All tokens now in individual classes
~ Parsing based on regular expressions
~ Fix negative numbers
~ Fix grouping with brackets

1 files changed, 54 insertions, 0 deletions

diff --git a/src/NXP/Classes/Token/TokenMinus.php b/src/NXP/Classes/Token/TokenMinus.php
new file mode 100644
index 0000000..0463d4c
--- /dev/null
+++ b/src/NXP/Classes/Token/TokenMinus.php
@@ -0,0 +1,54 @@
+<?php
+/**
+* This file is part of the MathExecutor package
+*
+* (c) Alexander Kiryukhin
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code
+*/
+
+namespace NXP\Classes\Token;
+
+/**
+* @author Alexander Kiryukhin <alexander@symdev.org>
+*/
+class TokenMinus extends AbstractOperator
+{
+    /**
+     * @return string
+     */
+    public static function getRegex()
+    {
+        return '\-';
+    }
+
+    /**
+     * @return int
+     */
+    public function getPriority()
+    {
+        return 1;
+    }
+
+    /**
+     * @return string
+     */
+    public function getAssociation()
+    {
+        return self::LEFT_ASSOC;
+    }
+
+    /**
+     * @param InterfaceToken[] $stack
+     * @return $this
+     */
+    public function execute(&$stack)
+    {
+        $op2 = array_pop($stack);
+        $op1 = array_pop($stack);
+        $result = $op1->getValue() - $op2->getValue();
+
+        return new TokenNumber($result);
+    }
+}