TimeRangeOfDay overlapping

Author: tanigami

src/Time/TimeRangeOfDay.php

@@ -85,6 +85,18 @@ public function includesOrEquals(self $other): bool
         return $this->start()->isBeforeOrEquals($other->start()) && $this->end()->isAfterOrEquals($other->end());
     }
 
+    /**
+     * @param self $other
+     * @return TimeRangeOfDay
+     */
+    public function overlapping(self $other): self
+    {
+        $start = $this->start()->isAfter($other->start()) ? $this->start() : $other->start();
+        $end = $this->end()->isBefore($other->end()) ? $this->end() : $other->end();
+
+        return new self($start, $end);
+    }
+
     /**
      * @return TimeRangeOfDay
      */

tests/Time/TimeRangeOfDayTest.php

@@ -95,4 +95,47 @@ public function testIncludesOrEquals()
         $this->assertFalse($timeRangeOfDay1020->includesOrEquals($timeRangeOfDay0030));
         $this->assertTrue($timeRangeOfDay0030->includesOrEquals($timeRangeOfDay0030));
     }
+
+    public function testOverlapping()
+    {
+        $time0 = new TimeOfDay(0);
+        $time1 = new TimeOfDay(1);
+        $time2 = new TimeOfDay(2);
+        $time3 = new TimeOfDay(3);
+        $this->assertSame(
+            0,
+            (new TimeRangeOfDay($time0, $time1))
+                ->overlapping(new TimeRangeOfDay($time1, $time2))
+                ->length()->hasSeconds());
+        $this->assertSame(
+            0,
+            (new TimeRangeOfDay($time1, $time2))
+                ->overlapping(new TimeRangeOfDay($time0, $time1))
+                ->length()->hasSeconds());
+        $this->assertSame(
+            60 * 60 * 3,
+            (new TimeRangeOfDay($time0, $time3))
+                ->overlapping(new TimeRangeOfDay($time0, $time3))
+                ->length()->hasSeconds());
+        $this->assertSame(
+            60 * 60,
+            (new TimeRangeOfDay($time0, $time2))
+                ->overlapping(new TimeRangeOfDay($time1, $time2))
+                ->length()->hasSeconds());
+        $this->assertSame(
+            60 * 60,
+            (new TimeRangeOfDay($time1, $time2))
+                ->overlapping(new TimeRangeOfDay($time0, $time2))
+                ->length()->hasSeconds());
+        $this->assertSame(
+            60 * 60,
+            (new TimeRangeOfDay($time0, $time3))
+                ->overlapping(new TimeRangeOfDay($time1, $time2))
+                ->length()->hasSeconds());
+        $this->assertSame(
+            60 * 60,
+            (new TimeRangeOfDay($time1, $time2))
+                ->overlapping(new TimeRangeOfDay($time0, $time3))
+                ->length()->hasSeconds());
+    }
 }