From 707e22029d8bcfc93918eaca27905d14e376d3b5 Mon Sep 17 00:00:00 2001
From: Clément Lafont <johnrazeur@gmail.com>
Date: Mon, 13 Jan 2020 18:09:18 +0100
Subject: Left bracket and minus fix (#55)

* Left bracket and minus fix (#54)

* Add test for left bracket and minus fix #55
---
 src/NXP/Classes/Token/TokenMinus.php | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/NXP/Classes/Token/TokenMinus.php b/src/NXP/Classes/Token/TokenMinus.php
index d8ac079..b4b04e3 100644
--- a/src/NXP/Classes/Token/TokenMinus.php
+++ b/src/NXP/Classes/Token/TokenMinus.php
@@ -53,8 +53,12 @@ class TokenMinus extends AbstractOperator
         $op2 = array_pop($stack);
         $op1 = array_pop($stack);
 
-        if ($op1 === null || $op2 === null) {
-            throw new IncorrectExpressionException("Subtraction requires two operators");
+        if ($op2 === null) {
+            throw new IncorrectExpressionException("Subtraction requires right operator");
+        }
+
+        if (!$op1) {
+            $op1 = new TokenNumber(0);
         }
 
         $result = $op1->getValue() - $op2->getValue();
-- 
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