Add ViewStyle API support

Sources/OpenSwiftUICore/View/Input/ViewInputPredicate.swift

@@ -9,6 +9,18 @@
 
 package protocol ViewInputPredicate {
     static func evaluate(inputs: _GraphInputs) -> Bool
+
+    static func evaluate(listInputs: _ViewListInputs) -> Bool
+}
+
+extension ViewInputPredicate {
+    package static func evaluate(inputs: _ViewInputs) -> Bool {
+        evaluate(inputs: inputs.base)
+    }
+
+    package static func evaluate(listInputs: _ViewListInputs) -> Bool {
+        evaluate(inputs: listInputs.base)
+    }
 }
 
 // MARK: - ViewInputFlag

Sources/OpenSwiftUICore/View/Style/DefaultStyle.swift

@@ -0,0 +1,64 @@
+//
+//  DefaultStyle.swift
+//  OpenSwiftUICore
+//
+//  Audited for 6.5.4
+//  Status: Complete
+
+// MARK: - AnyDefaultStyle
+
+package protocol AnyDefaultStyle {
+    init()
+}
+
+// MARK: - DefaultStyleModifier
+
+package protocol DefaultStyleModifier: StyleModifier where Style: AnyDefaultStyle {}
+
+// MARK: - StyleOverrideModifier
+
+package protocol StyleOverrideModifier: DefaultStyleModifier where Style == OverrideStyleModifier.Style {
+    associatedtype OriginalStyle
+
+    associatedtype OverrideStyleModifier: StyleModifier
+}
+
+// MARK: - StyleWriterOverrideModifier
+
+package protocol StyleWriterOverrideModifier: AnyDefaultStyle {
+    associatedtype OriginalStyle
+
+    associatedtype StyleOverride
+
+    static func injectStyleOverride(in inputs: inout _ViewInputs) -> ()
+}
+
+extension StyleWriterOverrideModifier {
+    package static func injectStyleOverride<P>(
+        in inputs: inout _ViewInputs,
+        requiring: P.Type
+    ) where P: ViewInputPredicate {
+        guard requiring.evaluate(inputs: inputs) else {
+            return
+        }
+        injectStyleOverride(in: &inputs)
+    }
+}
+
+// MARK: - DefaultStyleModifierTypeVisitor
+
+package protocol DefaultStyleModifierTypeVisitor {
+    func visit<T>(type: T.Type) where T: DefaultStyleModifier
+}
+
+// MARK: - StyleOverrideModifierTypeVisitor
+
+package protocol StyleOverrideModifierTypeVisitor {
+    func visit<T>(type: T.Type) where T: StyleOverrideModifier
+}
+
+// MARK: - StyleWriterOverrideModifierTypeVisitor
+
+package protocol StyleWriterOverrideModifierTypeVisitor {
+    func visit<T>(type: T.Type) where T: StyleWriterOverrideModifier
+}