feature/graphhost

Package.resolved

@@ -6,7 +6,7 @@
       "location" : "https://github.com/OpenSwiftUIProject/OpenGraph",
       "state" : {
         "branch" : "main",
-        "revision" : "10eb096bfdefd73bb50df410b87602208bcc06c1"
+        "revision" : "2435a0a02b3ab3b97799a8f387284686fe9e6a7a"
       }
     },
     {

Scripts/build.sh

@@ -0,0 +1,14 @@
+#!/bin/zsh
+
+# A `realpath` alternative using the default C implementation.
+filepath() {
+  [[ $1 = /* ]] && echo "$1" || echo "$PWD/${1#./}"
+}
+
+OPENSWIFTUI_ROOT="$(dirname $(dirname $(filepath $0)))"
+
+cd $OPENSWIFTUI_ROOT
+
+export OPENSWIFTUI_SWIFT_TESTING=0
+export OPENGRAPH_SWIFT_TESTING=0
+swift build

Sources/OpenSwiftUI/Core/Attribute/InvalidatableAttribute.swift

@@ -0,0 +1,14 @@
+//
+//  InvalidatableAttribute.swift
+//  OpenSwiftUI
+//
+//  Audited for RELEASE_2021
+//  Status: WIP
+
+internal import OpenGraphShims
+
+// TODO: PlatformViewChild in _A513612C07DFA438E70B9FA90719B40D
+
+protocol InvalidatableAttribute: _AttributeBody {
+    static func willInvalidate(attribute: OGAttribute)
+}

Sources/OpenSwiftUI/Core/Attribute/RemovableAttribute.swift

@@ -0,0 +1,13 @@
+//
+//  RemovableAttribute.swift
+//  OpenSwiftUI
+//
+//  Audited for RELEASE_2021
+//  Status: WIP
+
+internal import OpenGraphShims
+
+protocol RemovableAttribute: _AttributeBody {
+    static func willRemove(attribute: OGAttribute)
+    static func didReinsert(attribute: OGAttribute)
+}

Sources/OpenSwiftUI/Core/Data/Location/ObservableObjectLocation.swift

@@ -37,3 +37,8 @@ struct ObservableObjectLocation<Root, Value>: Location where Root: ObservableObj
         base[keyPath: keyPath] = value
     }
 }
+
+extension ObservableObjectLocation: TransactionHostProvider {
+    // TODO
+    var mutationHost: GraphHost? { nil }
+}

Sources/OpenSwiftUI/Core/Graph/Extensions/OGGraph.swift

@@ -0,0 +1,5 @@
+internal import OpenGraphShims
+
+extension OGGraph {
+
+}

Sources/OpenSwiftUI/Core/Graph/Extensions/OGSubgraph.swift

@@ -0,0 +1,38 @@
+internal import OpenGraphShims
+
+extension OGSubgraph {
+    func willRemove() {
+        #if canImport(Darwin)
+        OGSubgraph.apply(self, flags: .removable) { attribute in
+            let type = attribute._bodyType
+            if let removableType = type as? RemovableAttribute.Type {
+                removableType.willRemove(attribute: attribute)
+            }
+        }
+        #endif
+    }
+
+    func didReinsert() {
+        #if canImport(Darwin)
+        OGSubgraph.apply(self, flags: .removable) { attribute in
+            let type = attribute._bodyType
+            if let removableType = type as? RemovableAttribute.Type {
+                removableType.didReinsert(attribute: attribute)
+            }
+        }
+        #endif
+    }
+
+    func willInvalidate(isInserted: Bool) {
+        #if canImport(Darwin)
+        OGSubgraph.apply(self, flags: isInserted ? [.removable, .invalidatable] : [.invalidatable]) { attribute in
+            let type = attribute._bodyType
+            if let invalidatableType = type as? InvalidatableAttribute.Type {
+                invalidatableType.willInvalidate(attribute: attribute)
+            } else if isInserted, let removableType = type as? RemovableAttribute.Type {
+                removableType.willRemove(attribute: attribute)
+            }
+        }
+        #endif
+    }
+}