75 lines
2.5 KiB
Swift
75 lines
2.5 KiB
Swift
@_spi(Internals)
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public struct IntrospectionSelector<Target: PlatformEntity> {
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private var receiver: (IntrospectionPlatformViewController, IntrospectionAnchorID) -> Target?
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private var ancestor: (IntrospectionPlatformViewController, IntrospectionAnchorID) -> Target?
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@_spi(Internals)
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public static var `default`: Self { .from(Target.self, selector: { $0 }) }
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@_spi(Internals)
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public static func from<Entry: PlatformEntity>(_ entryType: Entry.Type, selector: @escaping (Entry) -> Target?) -> Self {
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.init { controller, scope, anchorID in
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guard let entity = { () -> (any PlatformEntity)? in
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if Entry.Base.self == PlatformView.self {
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#if canImport(UIKit)
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if let introspectionView = controller.viewIfLoaded {
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return introspectionView
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}
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#elseif canImport(AppKit)
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if controller.isViewLoaded {
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return controller.view
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}
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#endif
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} else if Entry.Base.self == PlatformViewController.self {
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return controller
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}
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return nil
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}() else {
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return nil
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}
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if
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scope.contains(.receiver),
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let entry = entity.receiver(ofType: Entry.self, anchorID: anchorID),
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let target = selector(entry)
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{
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return target
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}
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if
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scope.contains(.ancestor),
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let entry = entity.ancestor(ofType: Entry.self),
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let target = selector(entry)
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{
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return target
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}
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return nil
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}
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}
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init(
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_ selector: @escaping (IntrospectionPlatformViewController, IntrospectionScope, IntrospectionAnchorID) -> Target?
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) {
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self.receiver = { selector($0, .receiver, $1) }
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self.ancestor = { selector($0, .ancestor, $1) }
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}
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func callAsFunction(
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_ controller: IntrospectionPlatformViewController,
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_ scope: IntrospectionScope,
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_ anchorID: IntrospectionAnchorID
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) -> Target? {
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if
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scope.contains(.receiver),
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let target = receiver(controller, anchorID)
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{
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return target
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}
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if
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scope.contains(.ancestor),
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let target = ancestor(controller, anchorID)
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{
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return target
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}
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return nil
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}
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}
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