A game about forced loneliness, made by TACStudios
tacstudios.tngl.sh
1using UnityObject = UnityEngine.Object;
2
3namespace Unity.VisualScripting
4{
5 /// <summary>
6 /// Branches flow depending on whether the input is null.
7 /// </summary>
8 [UnitCategory("Nulls")]
9 [TypeIcon(typeof(Null))]
10 public sealed class NullCheck : Unit
11 {
12 /// <summary>
13 /// The input.
14 /// </summary>
15 [DoNotSerialize]
16 [PortLabelHidden]
17 public ValueInput input { get; private set; }
18
19 /// <summary>
20 /// The entry point for the null check.
21 /// </summary>
22 [DoNotSerialize]
23 [PortLabelHidden]
24 public ControlInput enter { get; private set; }
25
26 /// <summary>
27 /// The action to execute if the input is not null.
28 /// </summary>
29 [DoNotSerialize]
30 [PortLabel("Not Null")]
31 public ControlOutput ifNotNull { get; private set; }
32
33 /// <summary>
34 /// The action to execute if the input is null.
35 /// </summary>
36 [DoNotSerialize]
37 [PortLabel("Null")]
38 public ControlOutput ifNull { get; private set; }
39
40 protected override void Definition()
41 {
42 enter = ControlInput(nameof(enter), Enter);
43 input = ValueInput<object>(nameof(input)).AllowsNull();
44 ifNotNull = ControlOutput(nameof(ifNotNull));
45 ifNull = ControlOutput(nameof(ifNull));
46
47 Requirement(input, enter);
48 Succession(enter, ifNotNull);
49 Succession(enter, ifNull);
50 }
51
52 public ControlOutput Enter(Flow flow)
53 {
54 var input = flow.GetValue(this.input);
55
56 bool isNull;
57
58 if (input is UnityObject)
59 {
60 // Required cast because of Unity's custom == operator.
61 // ReSharper disable once ConditionIsAlwaysTrueOrFalse
62 isNull = (UnityObject)input == null;
63 }
64 else
65 {
66 isNull = input == null;
67 }
68
69 if (isNull)
70 {
71 return ifNull;
72 }
73 else
74 {
75 return ifNotNull;
76 }
77 }
78 }
79}