Support find usages and completion for animator

resharper/resharper-unity/src/CSharp/Daemon/Errors/CSharpErrors.xml

@@ -267,6 +267,13 @@
           The same shortcut is defined for another menu item
         </Description>
       </Tag>
+
+      <Tag externalName="UnknownAnimatorStateNameWarning.HIGHLIGHTING_ID" default="WARNING">
+        <Title>There is no animator state with the same name in the project.</Title>
+        <Description>
+          There is no animator state with the same name in the project.
+        </Description>
+      </Tag>
     </Group>
   </SeverityConfiguration>
 
@@ -289,6 +296,13 @@
          to use ERROR mode)
        -->
 
+  <Warning name="UnknownAnimatorStateName" configurableSeverity="Unity.UnknownAnimatorStateName">
+    <Parameter type="IArgument" name="argument" />
+    <Message value="There is no animator state with the same name in the project." />
+    <Range>Argument.GetDocumentRange()</Range>
+    <Behavour overlapResolvePolicy="WARNING" />
+  </Warning>
+
   <Warning name="UnknownInputAxes" configurableSeverity="Unity.UnknownInputAxes">
     <Parameter type="ITreeNode" name="node" />
     <Message value="The name is not defined in the Input manager. The call is likely to fail at runtime." />

resharper/resharper-unity/src/CSharp/Daemon/Stages/Analysis/PlayAnimatorStateAnalyzer.cs

@@ -0,0 +1,57 @@
+using System.Linq;
+using JetBrains.Annotations;
+using JetBrains.DataFlow;
+using JetBrains.ProjectModel;
+using JetBrains.ReSharper.Feature.Services.Daemon;
+using JetBrains.ReSharper.Plugins.Unity.CSharp.Daemon.Errors;
+using JetBrains.ReSharper.Plugins.Unity.Yaml;
+using JetBrains.ReSharper.Plugins.Unity.Yaml.Psi.DeferredCaches.AnimatorUsages;
+using JetBrains.ReSharper.Plugins.Yaml.Settings;
+using JetBrains.ReSharper.Psi.CSharp.Tree;
+using JetBrains.ReSharper.Psi.Tree;
+
+namespace JetBrains.ReSharper.Plugins.Unity.CSharp.Daemon.Stages.Analysis
+{
+    [ElementProblemAnalyzer(typeof(IInvocationExpression),
+        HighlightingTypes = new[] {typeof(UnknownAnimatorStateNameWarning)})]
+    public class PlayAnimatorStateAnalyzer : UnityElementProblemAnalyzer<IInvocationExpression>
+    {
+        [NotNull] private readonly AssetSerializationMode myAssetSerializationMode;
+        [NotNull] private readonly YamlSupport myUnityYamlSupport;
+
+        public PlayAnimatorStateAnalyzer([NotNull] UnityApi unityApi,
+                                         [NotNull] AssetSerializationMode assetSerializationMode,
+                                         [NotNull] YamlSupport unityYamlSupport)
+            : base(unityApi)
+        {
+            myAssetSerializationMode = assetSerializationMode;
+            myUnityYamlSupport = unityYamlSupport;
+        }
+
+        protected override void Analyze([NotNull] IInvocationExpression invocation,
+                                        ElementProblemAnalyzerData data,
+                                        [NotNull] IHighlightingConsumer consumer)
+        {
+            if (!myAssetSerializationMode.IsForceText || !myUnityYamlSupport.IsParsingEnabled.Value) return;
+            var argument = GetStateNameArgumentFrom(invocation);
+            if (!(argument?.Value is ICSharpLiteralExpression literal) ||
+                !invocation.InvocationExpressionReference.IsAnimatorPlayMethod()) return;
+            var container = invocation.GetSolution().TryGetComponent<AnimatorScriptUsagesElementContainer>();
+            if (container == null ||
+                !(literal.ConstantValue.Value is string stateName) || 
+                container.ContainsStateName(stateName)) return;
+            consumer.AddHighlighting(new UnknownAnimatorStateNameWarning(argument));
+        }
+
+        [CanBeNull]
+        private static ICSharpArgument GetStateNameArgumentFrom([NotNull] IInvocationExpression invocationExpression)
+        {
+            return invocationExpression
+                .ArgumentList?
+                .Arguments
+                .FirstOrDefault(t =>
+                    t != null &&
+                    (t.IsNamedArgument && t.ArgumentName?.Equals("stateName") == true || !t.IsNamedArgument));
+        }
+    }
+}

resharper/resharper-unity/src/CSharp/Daemon/Stages/Highlightings/IconsProviders/EventHandlerDetector.cs

@@ -1,10 +1,12 @@
 using System.Collections.Generic;
+using JetBrains.Annotations;
 using JetBrains.Application.UI.Controls.BulbMenu.Items;
 using JetBrains.ProjectModel;
 using JetBrains.ReSharper.Feature.Services.Daemon;
 using JetBrains.ReSharper.Plugins.Unity.CSharp.Daemon.Errors;
 using JetBrains.ReSharper.Plugins.Unity.CSharp.Daemon.Stages.ContextSystem;
 using JetBrains.ReSharper.Plugins.Unity.CSharp.Daemon.Stages.PerformanceCriticalCodeAnalysis.ContextSystem;
+using JetBrains.ReSharper.Plugins.Unity.Yaml.Psi.DeferredCaches.AnimationEventsUsages;
 using JetBrains.ReSharper.Plugins.Unity.Yaml.Psi.DeferredCaches.UnityEvents;
 using JetBrains.ReSharper.Psi;
 using JetBrains.ReSharper.Psi.CSharp.Tree;
@@ -18,33 +20,91 @@ namespace JetBrains.ReSharper.Plugins.Unity.CSharp.Daemon.Stages.Highlightings.I
     public class EventHandlerDetector : UnityDeclarationHighlightingProviderBase
     {
         protected readonly UnityEventsElementContainer UnityEventsElementContainer;
-
+        private readonly AnimationEventUsagesContainer myAnimationEventUsagesContainer;
+
         public EventHandlerDetector(ISolution solution, IApplicationWideContextBoundSettingStore settingsStore,
                                     UnityEventsElementContainer unityEventsElementContainer,
-                                    PerformanceCriticalContextProvider contextProvider)
+                                    PerformanceCriticalContextProvider contextProvider,
+                                    [NotNull] AnimationEventUsagesContainer animationEventUsagesContainer)
             : base(solution, settingsStore, contextProvider)
         {
             UnityEventsElementContainer = unityEventsElementContainer;
+            myAnimationEventUsagesContainer = animationEventUsagesContainer;
         }
 
         public override bool AddDeclarationHighlighting(IDeclaration treeNode, IHighlightingConsumer consumer,
                                                         IReadOnlyCallGraphContext context)
         {
             var declaredElement = treeNode.DeclaredElement;
             var method = declaredElement as IMethod;
-            if (method is IAccessor)
-                return false;
+            if (method is IAccessor) 
+                return TryAddAnimationEventHighlightingForAccessorMethod(treeNode, consumer, context, method);
 
             if (declaredElement is IProperty property)
+            {
+                TryAddAnimationEventHighlightingForPropertyGetter(treeNode, consumer, context, property);
                 method = property.Setter;
+            }
+
+            return method != null && TryAddMethodHighlighting(treeNode, consumer, context, method);
+        }
 
-            if (method != null && UnityEventsElementContainer.GetAssetUsagesCount(method, out _) > 0)
+        private bool TryAddAnimationEventHighlightingForAccessorMethod(ITreeNode treeNode,
+                                                                       IHighlightingConsumer consumer,
+                                                                       IReadOnlyCallGraphContext context,
+                                                                       IDeclaredElement method)
+        {
+            var isAnimationEvent = myAnimationEventUsagesContainer.GetEventUsagesCountFor(method, out _) > 0;
+            if (isAnimationEvent) AddAnimationEventHighlighting(treeNode, consumer, context);
+            return isAnimationEvent;
+        }
+
+        private void TryAddAnimationEventHighlightingForPropertyGetter(ITreeNode treeNode,
+                                                                       IHighlightingConsumer consumer,
+                                                                       IReadOnlyCallGraphContext context,
+                                                                       IProperty property)
+        {
+            var getter = property.Getter;
+            if (getter != null && myAnimationEventUsagesContainer.GetEventUsagesCountFor(getter, out _) > 0)
             {
-                AddHighlighting(consumer, treeNode as ICSharpDeclaration, "Event handler", "Unity event handler", context);
-                return true;
+                AddAnimationEventHighlighting(treeNode, consumer, context);
             }
+        }
 
-            return false;
+        private bool TryAddMethodHighlighting(IDeclaration treeNode, IHighlightingConsumer consumer, IReadOnlyCallGraphContext context,
+                                              IMethod method)
+        {
+            var eventHandlersCount = UnityEventsElementContainer.GetAssetUsagesCount(method, out _);
+            var animationEventsCount = myAnimationEventUsagesContainer.GetEventUsagesCountFor(method, out _);
+            if (eventHandlersCount + animationEventsCount <= 0) return false;
+            if (eventHandlersCount != 0 && animationEventsCount == 0)
+                AddEventHandlerHighlighting(treeNode, consumer, context);
+            if (eventHandlersCount == 0 && animationEventsCount != 0)
+                AddAnimationEventHighlighting(treeNode, consumer, context);
+            AddAnimationEventAndEventHandlerHighlighting(treeNode, consumer, context);
+            return true;
+        }
+
+        private void AddEventHandlerHighlighting([NotNull] ITreeNode treeNode,
+                                                 [NotNull] IHighlightingConsumer consumer,
+                                                 IReadOnlyCallGraphContext context)
+        {
+            AddHighlighting(consumer, treeNode as ICSharpDeclaration, "Event handler", "Unity event handler", context);
+        }
+
+        private void AddAnimationEventHighlighting([NotNull] ITreeNode treeNode,
+                                                   [NotNull] IHighlightingConsumer consumer,
+                                                   IReadOnlyCallGraphContext context)
+        {
+            AddHighlighting(consumer, treeNode as ICSharpDeclaration, "Animation event", "Unity animation event", context);
+        }
+
+        private void AddAnimationEventAndEventHandlerHighlighting([NotNull] ITreeNode treeNode,
+                                                                  [NotNull] IHighlightingConsumer consumer,
+                                                                  IReadOnlyCallGraphContext context)
+        {
+            AddHighlighting(consumer, treeNode as ICSharpDeclaration, "Animation event and event handler",
+                "Unity animation event and Unity animation event", context);
         }
 
         protected override void AddHighlighting(IHighlightingConsumer consumer, ICSharpDeclaration element, string text,

resharper/resharper-unity/src/CSharp/Daemon/UsageChecking/UsageInspectionsSuppressor.cs

@@ -7,6 +7,7 @@
 using JetBrains.ReSharper.Daemon.UsageChecking;
 using JetBrains.ReSharper.Plugins.Unity.Feature.Caches;
 using JetBrains.ReSharper.Plugins.Unity.Yaml;
+using JetBrains.ReSharper.Plugins.Unity.Yaml.Psi.DeferredCaches.AnimationEventsUsages;
 using JetBrains.ReSharper.Plugins.Unity.Yaml.Psi.DeferredCaches.UnityEvents;
 using JetBrains.ReSharper.Psi;
 
@@ -70,7 +71,9 @@ public bool SuppressUsageInspectionsOnElement(IDeclaredElement element, out Impl
                         return false;
                     }
 
-                    if (IsEventHandler(unityApi, method) || IsRequiredSignatureMethod(method) ||
+                    if (IsEventHandler(unityApi, method) ||
+                        IsRequiredSignatureMethod(method) ||
+                        IsAnimationEvent(solution, method) ||
                         IsImplicitlyUsedInterfaceMethod(method))
                     {
                         flags = ImplicitUseKindFlags.Access;
@@ -82,7 +85,9 @@ public bool SuppressUsageInspectionsOnElement(IDeclaredElement element, out Impl
                     flags = ImplicitUseKindFlags.Assign;
                     return true;
 
-                case IProperty property when IsEventHandler(unityApi, property.Setter) || IsImplicitlyUsedInterfaceProperty(property):
+                case IProperty property when IsEventHandler(unityApi, property.Setter) ||
+                                             IsImplicitlyUsedInterfaceProperty(property) ||
+                                             IsAnimationEvent(solution, property):
                     flags = ImplicitUseKindFlags.Assign;
                     return true;
             }
@@ -91,6 +96,13 @@ public bool SuppressUsageInspectionsOnElement(IDeclaredElement element, out Impl
             return false;
         }
 
+        private static bool IsAnimationEvent(ISolution solution, IDeclaredElement property)
+        {
+            return solution
+                .GetComponent<AnimationEventUsagesContainer>()
+                .GetEventUsagesCountFor(property, out var isEstimatedResult) > 0 || isEstimatedResult;
+        }
+
         private bool IsImplicitlyUsedInterfaceType(ITypeElement typeElement)
         {
             foreach (var implicitlyUsedTypeName in myImplicitlyUsedInterfaces)
@@ -152,7 +164,10 @@ private bool IsEventHandler(UnityApi unityApi, [CanBeNull] IMethod method)
             if (!yamlParsingEnabled.Value || !assetSerializationMode.IsForceText || !solution.GetComponent<DeferredCacheController>().CompletedOnce.Value)
                 return unityApi.IsPotentialEventHandler(method, false); // if yaml parsing is disabled, we will consider private methods as unused
 
-            return solution.GetComponent<UnityEventsElementContainer>().GetAssetUsagesCount(method, out bool estimatedResult) > 0 || estimatedResult;
+            var eventsCount = solution
+                .GetComponent<UnityEventsElementContainer>()
+                .GetAssetUsagesCount(method, out bool estimatedResult);
+            return eventsCount > 0 || estimatedResult;
         }
 
         // If the method is marked with an attribute that has a method that is itself marked with RequiredSignature,

resharper/resharper-unity/src/CSharp/ExpressionReferenceUtils.cs

@@ -73,15 +73,20 @@ private static bool IsSpecificMethod(IInvocationExpression invocationExpression,
 
         public static bool IsSceneManagerSceneRelatedMethod(this IInvocationExpressionReference reference)
         {
-            return IsSceneRelatedMethod(reference, IsSceneManagerLoadScene);
+            return IsRelatedMethod(reference, IsSceneManagerLoadScene);
         }
 
         public static bool IsEditorSceneManagerSceneRelatedMethod(this IInvocationExpressionReference reference)
         {
-            return IsSceneRelatedMethod(reference, IsEditorSceneManagerLoadScene);
+            return IsRelatedMethod(reference, IsEditorSceneManagerLoadScene);
+        }
+
+        public static bool IsAnimatorPlayMethod(this IInvocationExpressionReference reference)
+        {
+            return IsRelatedMethod(reference, IsAnimatorPlay);
         }
 
-        private static bool IsSceneRelatedMethod(IInvocationExpressionReference reference, Func<IMethod, bool> checker)
+        private static bool IsRelatedMethod(IInvocationExpressionReference reference, Func<IMethod, bool> checker)
         {
             var result = reference.Resolve();
             if (checker(result.DeclaredElement as IMethod))
@@ -117,5 +122,12 @@ private static bool IsSceneManagerLoadScene(IMethod method)
 
             return false;
         }
+
+        private static bool IsAnimatorPlay(IMethod method)
+        {
+            return method != null &&
+                   method.ShortName.StartsWith("Play") &&
+                   method.GetContainingType()?.GetClrName().Equals(KnownTypes.Animator) == true;
+        }
     }
 }

resharper/resharper-unity/src/CSharp/Feature/Services/CodeCompletion/UnityProjectSettingsCompletionProvider.cs

@@ -11,6 +11,7 @@
 using JetBrains.ReSharper.Feature.Services.Lookup;
 using JetBrains.ReSharper.Features.Intellisense.CodeCompletion.CSharp.Rules;
 using JetBrains.ReSharper.Plugins.Unity.Yaml.Psi.Caches;
+using JetBrains.ReSharper.Plugins.Unity.Yaml.Psi.DeferredCaches.AnimatorUsages;
 using JetBrains.ReSharper.Psi;
 using JetBrains.ReSharper.Psi.CSharp;
 using JetBrains.ReSharper.Psi.CSharp.Tree;
@@ -41,6 +42,11 @@ protected override bool AddLookupItems(CSharpCodeCompletionContext context, IIte
                 var cache = context.NodeInFile.GetSolution().GetComponent<UnityProjectSettingsCache>();
                 completionItems = cache.GetAllPossibleSceneNames();
 
+            } // animator state completion
+            else if (IsSpecificArgumentInSpecificMethod(context, out argumentLiteral, IsPlayAnimationMethod, IsCorrespondingArgument("stateName")))
+            {
+                var container = context.NodeInFile.GetSolution().GetComponent<AnimatorScriptUsagesElementContainer>();
+                completionItems = container.GetStateNames();
             } // tag completion, tag == "..."
             else if (IsTagEquality(context, out argumentLiteral))
             {
@@ -137,6 +143,11 @@ private bool IsLoadSceneMethod(IInvocationExpression invocationExpression)
             return invocationExpression.InvocationExpressionReference.IsSceneManagerSceneRelatedMethod() ||
                    invocationExpression.InvocationExpressionReference.IsEditorSceneManagerSceneRelatedMethod();
         }
+
+        private static bool IsPlayAnimationMethod([NotNull] IInvocationExpression invocationExpression)
+        {
+            return invocationExpression.InvocationExpressionReference.IsAnimatorPlayMethod();
+        }
 
         private bool IsTagEquality(CSharpCodeCompletionContext context, out ICSharpLiteralExpression stringLiteral)
         {