Use a single toString implementation for protocol nodes

redwood-protocol-host/api/redwood-protocol-host.api

@@ -44,9 +44,10 @@ public abstract class app/cash/redwood/protocol/host/ProtocolNode {
 	public abstract fun detach ()V
 	public final fun getId-0HhLjSo ()I
 	public abstract fun getWidget ()Lapp/cash/redwood/widget/Widget;
+	public abstract fun getWidgetName ()Ljava/lang/String;
 	public abstract fun getWidgetTag-BlhN7y0 ()I
 	public final fun setId-ou3jOuA (I)V
-	public abstract fun toString ()Ljava/lang/String;
+	public final fun toString ()Ljava/lang/String;
 	public final fun updateModifier (Lapp/cash/redwood/Modifier;)V
 	public fun visitIds (Lapp/cash/redwood/protocol/host/IdVisitor;)V
 }

redwood-protocol-host/api/redwood-protocol-host.klib.api

@@ -42,6 +42,8 @@ abstract class <#A: kotlin/Any> app.cash.redwood.protocol.host/ProtocolNode { //
 
     abstract val widget // app.cash.redwood.protocol.host/ProtocolNode.widget|{}widget[0]
         abstract fun <get-widget>(): app.cash.redwood.widget/Widget<#A> // app.cash.redwood.protocol.host/ProtocolNode.widget.<get-widget>|<get-widget>(){}[0]
+    abstract val widgetName // app.cash.redwood.protocol.host/ProtocolNode.widgetName|{}widgetName[0]
+        abstract fun <get-widgetName>(): kotlin/String // app.cash.redwood.protocol.host/ProtocolNode.widgetName.<get-widgetName>|<get-widgetName>(){}[0]
     abstract val widgetTag // app.cash.redwood.protocol.host/ProtocolNode.widgetTag|{}widgetTag[0]
         abstract fun <get-widgetTag>(): app.cash.redwood.protocol/WidgetTag // app.cash.redwood.protocol.host/ProtocolNode.widgetTag.<get-widgetTag>|<get-widgetTag>(){}[0]
 
@@ -52,7 +54,7 @@ abstract class <#A: kotlin/Any> app.cash.redwood.protocol.host/ProtocolNode { //
     abstract fun apply(app.cash.redwood.protocol/PropertyChange, app.cash.redwood.protocol.host/UiEventSink) // app.cash.redwood.protocol.host/ProtocolNode.apply|apply(app.cash.redwood.protocol.PropertyChange;app.cash.redwood.protocol.host.UiEventSink){}[0]
     abstract fun children(app.cash.redwood.protocol/ChildrenTag): app.cash.redwood.protocol.host/ProtocolChildren<#A>? // app.cash.redwood.protocol.host/ProtocolNode.children|children(app.cash.redwood.protocol.ChildrenTag){}[0]
     abstract fun detach() // app.cash.redwood.protocol.host/ProtocolNode.detach|detach(){}[0]
-    abstract fun toString(): kotlin/String // app.cash.redwood.protocol.host/ProtocolNode.toString|toString(){}[0]
+    final fun toString(): kotlin/String // app.cash.redwood.protocol.host/ProtocolNode.toString|toString(){}[0]
     final fun updateModifier(app.cash.redwood/Modifier) // app.cash.redwood.protocol.host/ProtocolNode.updateModifier|updateModifier(app.cash.redwood.Modifier){}[0]
     open fun visitIds(app.cash.redwood.protocol.host/IdVisitor) // app.cash.redwood.protocol.host/ProtocolNode.visitIds|visitIds(app.cash.redwood.protocol.host.IdVisitor){}[0]
 }

redwood-protocol-host/src/commonMain/kotlin/app/cash/redwood/protocol/host/HostProtocolAdapter.kt

@@ -396,6 +396,8 @@ private class RootProtocolNode<W : Any>(
   Widget<W> {
   override val widgetTag: WidgetTag get() = UnknownWidgetTag
 
+  override val widgetName: String get() = "RootProtocolNode"
+
   private val children = ProtocolChildren(children)
 
   override fun apply(change: PropertyChange, eventSink: UiEventSink) {
@@ -424,8 +426,6 @@ private class RootProtocolNode<W : Any>(
   override fun detach() {
     children.detach()
   }
-
-  override fun toString() = "RootProtocolNode"
 }
 
 private const val REUSE_MODIFIER_TAG = -4_543_827

redwood-protocol-host/src/commonMain/kotlin/app/cash/redwood/protocol/host/ProtocolNode.kt

@@ -37,6 +37,8 @@ public abstract class ProtocolNode<W : Any>(
 ) {
   public abstract val widgetTag: WidgetTag
 
+  public abstract val widgetName: String
+
   public abstract val widget: Widget<W>
 
   /** The index of [widget] within its parent [container]. */
@@ -78,7 +80,14 @@ public abstract class ProtocolNode<W : Any>(
   public abstract fun detach()
 
   /** Human-readable name of this node along with [id] and [widgetTag]. */
-  public abstract override fun toString(): String
+  public final override fun toString(): String = buildString {
+    append(widgetName)
+    append("(id=")
+    append(id.value)
+    append(", tag=")
+    append(widgetTag.value)
+    append(")")
+  }
 }
 
 /** @suppress */

redwood-protocol-host/src/commonTest/kotlin/app/cash/redwood/protocol/host/ChildrenNodeIndexTest.kt

@@ -128,6 +128,7 @@ class ChildrenNodeIndexTest {
 @OptIn(RedwoodCodegenApi::class)
 private class WidgetNode(override val widget: StringWidget) : ProtocolNode<String>(Id(1)) {
   override val widgetTag: WidgetTag get() = WidgetTag(1)
+  override val widgetName: String get() = "WidgetNode"
 
   override fun apply(change: PropertyChange, eventSink: UiEventSink) {
     throw UnsupportedOperationException()
@@ -139,8 +140,6 @@ private class WidgetNode(override val widget: StringWidget) : ProtocolNode<Strin
 
   override fun detach() {
   }
-
-  override fun toString() = "WidgetNode"
 }
 
 private class StringWidget(override val value: String) : Widget<String> {

redwood-tooling-codegen/src/main/kotlin/app/cash/redwood/tooling/codegen/protocolHostGeneration.kt

@@ -328,6 +328,15 @@ internal fun generateProtocolNode(
             )
             .build(),
         )
+        .addProperty(
+          PropertySpec.builder("widgetName", STRING, OVERRIDE)
+            .getter(
+              FunSpec.getterBuilder()
+                .addStatement("return %S", widget.type.flatName)
+                .build(),
+            )
+            .build(),
+        )
         .addProperty(
           PropertySpec.builder("_widget", widgetType.copy(nullable = true), PRIVATE)
             .mutable(true)
@@ -526,22 +535,6 @@ internal fun generateProtocolNode(
             .addStatement("_widget = null")
             .build(),
         )
-        .addFunction(
-          FunSpec.builder("toString")
-            .addModifiers(OVERRIDE)
-            .returns(STRING)
-            // This explicit string builder usage allows sharing of strings in dex.
-            // See https://jakewharton.com/the-economics-of-generated-code/#string-duplication.
-            .beginControlFlow("return buildString")
-            .addStatement("append(%S)", type.simpleName)
-            .addStatement("""append("(id=")""")
-            .addStatement("append(id.value)")
-            .addStatement("""append(", tag=")""")
-            .addStatement("append(%L)", widget.tag)
-            .addStatement("append(')')")
-            .endControlFlow()
-            .build(),
-        )
         .build(),
     )
   }

redwood-treehouse-host/src/commonTest/kotlin/app/cash/redwood/treehouse/FakeProtocolNode.kt

@@ -35,6 +35,8 @@ internal class FakeProtocolNode(
   id: Id,
   override val widgetTag: WidgetTag,
 ) : ProtocolNode<FakeWidget>(id) {
+  override val widgetName: String get() = "FakeProtocolNode"
+
   override val widget = FakeWidget()
 
   override fun apply(change: PropertyChange, eventSink: UiEventSink) {
@@ -50,6 +52,4 @@ internal class FakeProtocolNode(
 
   override fun detach() {
   }
-
-  override fun toString() = "FakeProtocolNode(id=${id.value}, tag=${widgetTag.value})"
 }