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, 41 insertions, 0 deletions

diff --git a/src/NXP/Classes/Token/TokenFunction.php b/src/NXP/Classes/Token/TokenFunction.php
new file mode 100644
index 0000000..23f64bd
--- /dev/null
+++ b/src/NXP/Classes/Token/TokenFunction.php
@@ -0,0 +1,41 @@
+<?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 TokenFunction extends AbstractContainerToken implements InterfaceFunction
+{
+    /**
+     * @return string
+     */
+    public static function getRegex()
+    {
+        return '[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*';
+    }
+
+    /**
+     * @param array $stack
+     * @return $this
+     */
+    public function execute(&$stack)
+    {
+        $args = array();
+        list($places, $function) = $this->value;
+        for ($i = 0; $i < $places; $i++) {
+            array_push($args, array_pop($stack)->getValue());
+        }
+        $result = call_user_func_array($function, $args);
+
+        return new TokenNumber($result);
+    }
+}