Support for double quoted strings

Changed array() to [] syntax.
Added variable in question to unknown variable exception.
Added getVar and getVars accessor functions.
Added getOperators and getFunctions accessor functions for completeness.
Extended all Exceptions off MathExecutorException.

2 files changed, 26 insertions, 1 deletions

diff --git a/src/NXP/Classes/Token/TokenFunction.php b/src/NXP/Classes/Token/TokenFunction.php
index 23f64bd..2ed8ace 100644
--- a/src/NXP/Classes/Token/TokenFunction.php
+++ b/src/NXP/Classes/Token/TokenFunction.php
@@ -29,7 +29,7 @@ class TokenFunction extends AbstractContainerToken implements InterfaceFunction
      */
     public function execute(&$stack)
     {
-        $args = array();
+        $args = [];
         list($places, $function) = $this->value;
         for ($i = 0; $i < $places; $i++) {
             array_push($args, array_pop($stack)->getValue());
diff --git a/src/NXP/Classes/Token/TokenString.php b/src/NXP/Classes/Token/TokenString.php
new file mode 100644
index 0000000..cab0711
--- /dev/null
+++ b/src/NXP/Classes/Token/TokenString.php
@@ -0,0 +1,25 @@
+<?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 Bruce Wells <brucekwells@gmail.com>
+ */
+class TokenString extends AbstractContainerToken
+{
+    /**
+     * @return string
+     */
+    public static function getRegex()
+    {
+        return '"([^"]|"")*"';
+    }
+}