From 2e28354db3521dba7254481e61be3a3422999c64 Mon Sep 17 00:00:00 2001
From: Robert van Steen <mail@robertvansteen.nl>
Date: Tue, 8 Apr 2025 16:55:03 +0200
Subject: [PATCH] fix: zero parsing

---
 src/Interval.php       | 4 ++--
 tests/IntervalTest.php | 2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/Interval.php b/src/Interval.php
index fbff5b7..48b322c 100644
--- a/src/Interval.php
+++ b/src/Interval.php
@@ -34,12 +34,12 @@ public static function fromString(string $interval): static
         $leftEndpoint = $matches['leftEndpoint'] ?? null;
         $rightEndpoint = $matches['rightEndpoint'] ?? null;
 
-        if (empty($leftEndpoint)) {
+        if (! $leftEndpoint && $leftEndpoint !== '0') {
             Assert::eq($openingSymbol, '(', 'Left endpoint must be defined when left side is closed.');
             $leftEndpoint = PHP_INT_MIN;
         }
 
-        if (empty($rightEndpoint)) {
+        if (! $rightEndpoint && $rightEndpoint !== '0') {
             Assert::eq($closingSymbol, ')', 'Right endpoint must be defined when right side is closed.');
             $rightEndpoint = PHP_INT_MAX;
         }
diff --git a/tests/IntervalTest.php b/tests/IntervalTest.php
index 2bd3ad6..4bb7cbc 100644
--- a/tests/IntervalTest.php
+++ b/tests/IntervalTest.php
@@ -36,6 +36,8 @@ public static function validCases(): array
             ['(,)', PHP_INT_MIN, PHP_INT_MAX, IntervalNotation::Open],
             ['[1,2)', 1, 2, IntervalNotation::RightOpen],
             ['(1,2]', 1, 2, IntervalNotation::LeftOpen],
+            ['[0,1)', 0, 1, IntervalNotation::RightOpen],
+            ['[-1,0]', -1, 0, IntervalNotation::Closed],
         ];
     }