Initial Commit

Library/PackageCache/com.unity.visualscripting@1.5.2/Runtime/VisualScripting.Flow/Framework/Nulls/Null.cs

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+namespace Unity.VisualScripting
+{
+    /// <summary>
+    /// Returns a null value.
+    /// </summary>
+    [UnitCategory("Nulls")]
+    public sealed class Null : Unit
+    {
+        /// <summary>
+        /// A null value.
+        /// </summary>
+        [DoNotSerialize]
+        public ValueOutput @null { get; private set; }
+
+        protected override void Definition()
+        {
+            @null = ValueOutput<object>(nameof(@null), (recursion) => null).Predictable();
+        }
+    }
+}

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Library/PackageCache/com.unity.visualscripting@1.5.2/Runtime/VisualScripting.Flow/Framework/Nulls/NullCheck.cs

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+using UnityObject = UnityEngine.Object;
+
+namespace Unity.VisualScripting
+{
+    /// <summary>
+    /// Branches flow depending on whether the input is null.
+    /// </summary>
+    [UnitCategory("Nulls")]
+    [TypeIcon(typeof(Null))]
+    public sealed class NullCheck : Unit
+    {
+        /// <summary>
+        /// The input.
+        /// </summary>
+        [DoNotSerialize]
+        [PortLabelHidden]
+        public ValueInput input { get; private set; }
+
+        /// <summary>
+        /// The entry point for the null check.
+        /// </summary>
+        [DoNotSerialize]
+        [PortLabelHidden]
+        public ControlInput enter { get; private set; }
+
+        /// <summary>
+        /// The action to execute if the input is not null.
+        /// </summary>
+        [DoNotSerialize]
+        [PortLabel("Not Null")]
+        public ControlOutput ifNotNull { get; private set; }
+
+        /// <summary>
+        /// The action to execute if the input is null.
+        /// </summary>
+        [DoNotSerialize]
+        [PortLabel("Null")]
+        public ControlOutput ifNull { get; private set; }
+
+        protected override void Definition()
+        {
+            enter = ControlInput(nameof(enter), Enter);
+            input = ValueInput<object>(nameof(input)).AllowsNull();
+            ifNotNull = ControlOutput(nameof(ifNotNull));
+            ifNull = ControlOutput(nameof(ifNull));
+
+            Requirement(input, enter);
+            Succession(enter, ifNotNull);
+            Succession(enter, ifNull);
+        }
+
+        public ControlOutput Enter(Flow flow)
+        {
+            var input = flow.GetValue(this.input);
+
+            bool isNull;
+
+            if (input is UnityObject)
+            {
+                // Required cast because of Unity's custom == operator.
+                // ReSharper disable once ConditionIsAlwaysTrueOrFalse
+                isNull = (UnityObject)input == null;
+            }
+            else
+            {
+                isNull = input == null;
+            }
+
+            if (isNull)
+            {
+                return ifNull;
+            }
+            else
+            {
+                return ifNotNull;
+            }
+        }
+    }
+}

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Library/PackageCache/com.unity.visualscripting@1.5.2/Runtime/VisualScripting.Flow/Framework/Nulls/NullCoalesce.cs

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+using UnityObject = UnityEngine.Object;
+
+namespace Unity.VisualScripting
+{
+    /// <summary>
+    /// Provides a fallback value if the input value is null.
+    /// </summary>
+    [UnitCategory("Nulls")]
+    [TypeIcon(typeof(Null))]
+    public sealed class NullCoalesce : Unit
+    {
+        /// <summary>
+        /// The value.
+        /// </summary>
+        [DoNotSerialize]
+        public ValueInput input { get; private set; }
+
+        /// <summary>
+        /// The fallback to use if the value is null.
+        /// </summary>
+        [DoNotSerialize]
+        public ValueInput fallback { get; private set; }
+
+        /// <summary>
+        /// The returned value.
+        /// </summary>
+        [DoNotSerialize]
+        [PortLabelHidden]
+        public ValueOutput result { get; private set; }
+
+        protected override void Definition()
+        {
+            input = ValueInput<object>(nameof(input)).AllowsNull();
+            fallback = ValueInput<object>(nameof(fallback));
+            result = ValueOutput(nameof(result), Coalesce).Predictable();
+
+            Requirement(input, result);
+            Requirement(fallback, result);
+        }
+
+        public object Coalesce(Flow flow)
+        {
+            var input = flow.GetValue(this.input);
+
+            bool isNull;
+
+            if (input is UnityObject)
+            {
+                // Required cast because of Unity's custom == operator.
+                // ReSharper disable once ConditionIsAlwaysTrueOrFalse
+                isNull = (UnityObject)input == null;
+            }
+            else
+            {
+                isNull = input == null;
+            }
+
+            return isNull ? flow.GetValue(fallback) : input;
+        }
+    }
+}

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