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-rw-r--r--src/NXP/Classes/Calculator.php6
1 files changed, 5 insertions, 1 deletions
diff --git a/src/NXP/Classes/Calculator.php b/src/NXP/Classes/Calculator.php
index b584d69..bfa7015 100644
--- a/src/NXP/Classes/Calculator.php
+++ b/src/NXP/Classes/Calculator.php
@@ -13,6 +13,7 @@ namespace NXP\Classes;
use NXP\Classes\Token\InterfaceOperator;
use NXP\Classes\Token\TokenFunction;
use NXP\Classes\Token\TokenNumber;
+use NXP\Classes\Token\TokenString;
use NXP\Classes\Token\TokenVariable;
use NXP\Exception\IncorrectExpressionException;
use NXP\Exception\UnknownVariableException;
@@ -32,11 +33,14 @@ class Calculator
*/
public function calculate($tokens, $variables)
{
- $stack = array();
+ $stack = [];
foreach ($tokens as $token) {
if ($token instanceof TokenNumber) {
array_push($stack, $token);
}
+ if ($token instanceof TokenString) {
+ array_push($stack, $token);
+ }
if ($token instanceof TokenVariable) {
$variable = $token->getValue();
if (!array_key_exists($variable, $variables)) {