Add BodyAccessor Support (#38)

* Update GraphHost

* Update GraphValue and GraphInputs

* Add BodyAccessor and BodyAccessorRule

* Add StaticBody implementation

* Complete missing part of StaticBody

* Update StaticBody

* Add BodyAccessor.makeBody logic

* Workaround non-Darwin platform build issue

Tracked with #39

* Add scripts and update swift-syntax version

Package.resolved

@@ -6,16 +6,16 @@
       "location" : "https://github.com/OpenSwiftUIProject/OpenGraph",
       "state" : {
         "branch" : "main",
-        "revision" : "8cc89abc1fff74b387a083eab8ffa91f1b9fdca7"
+        "revision" : "6133e9f737077b5c75ff33dee1c2c969cb5d91b4"
       }
     },
     {
       "identity" : "swift-syntax",
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/apple/swift-syntax.git",
       "state" : {
-        "revision" : "6ad4ea24b01559dde0773e3d091f1b9e36175036",
-        "version" : "509.0.2"
+        "revision" : "64889f0c732f210a935a0ad7cda38f77f876262d",
+        "version" : "509.1.1"
       }
     },
     {

Scripts/demangle.sh

@@ -0,0 +1,30 @@
+#!/bin/zsh
+
+# A `realpath` alternative using the default C implementation.
+filepath() {
+  [[ $1 = /* ]] && echo "$1" || echo "$PWD/${1#./}"
+}
+
+OG_ROOT="$(dirname $(dirname $(filepath $0)))"
+
+# Get the language and input file path from the arguments
+language=${1:-"swift"}
+input_file=${2:-"$(dirname $(filepath $0))/demangle.txt"}
+
+echo "Demangling $input_file using $language mode"
+
+# Read each line of the input file
+while IFS= read -r line; do
+  # Demangle the line using the appropriate tool based on the language
+  if [[ $language == "swift" ]]; then
+    xcrun swift-demangle "$line"
+  elif [[ $language == "c++" ]]; then
+    c++filt "$line"
+  else
+    echo "Invalid language: $language"
+    echo "Usage: demangle.sh <language> <input file>"
+    echo "language: swift or c++, [default]: swift"
+    echo "input file: [default] demangle.txt"
+    exit 1
+  fi
+done < "$input_file"

Scripts/openswiftui_swiftinterface.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 -c release -Xswiftc -emit-module-interface -Xswiftc -enable-library-evolution

Sources/OpenSwiftUI/DataAndStorage/ModelData/DynamicProperty/DynamicProperty.swift

@@ -5,6 +5,9 @@
 //  Created by Kyle on 2023/11/2.
 //  Lastest Version: iOS 15.5
 //  Status: Complete
+//  ID: 49D2A32E637CD497C6DE29B8E060A506
+
+internal import OpenGraphShims
 
 /// An interface for a stored variable that updates an external property of a
 /// view.
@@ -29,8 +32,209 @@ public protocol DynamicProperty {
     mutating func update()
 }
 
+// MARK: Default implementation for DynamicProperty
+
 extension DynamicProperty {
+    public static func _makeProperty<Value>(
+        in buffer: inout _DynamicPropertyBuffer,
+        container: _GraphValue<Value>,
+        fieldOffset: Int,
+        inputs: inout _GraphInputs
+    ) {
+        makeEmbeddedProperties(
+            in: &buffer,
+            container: container,
+            fieldOffset: fieldOffset,
+            inputs: &inputs
+        )
+        buffer.append(
+            EmbeddedDynamicPropertyBox<Self>(),
+            fieldOffset: fieldOffset
+        )
+    }
+
     public static var _propertyBehaviors: UInt32 { 0 }
 
     public mutating func update() {}
 }
+
+// MARK: - EmbeddedDynamicPropertyBox
+
+private struct EmbeddedDynamicPropertyBox<Value: DynamicProperty>: DynamicPropertyBox {
+    typealias Property = Value
+    func destroy() {}
+    func reset() {}
+    func update(property: inout Property, phase _: _GraphInputs.Phase) -> Bool {
+        property.update()
+        return false
+    }
+}
+
+extension DynamicProperty {
+    static func makeEmbeddedProperties<Value>(
+        in buffer: inout _DynamicPropertyBuffer,
+        container: _GraphValue<Value>,
+        fieldOffset: Int,
+        inputs: inout _GraphInputs
+    ) {
+        let fields = DynamicPropertyCache.fields(of: self)
+        buffer.addFields(
+            fields,
+            container: container,
+            inputs: &inputs,
+            baseOffset: fieldOffset
+        )
+    }
+}
+
+// FIXME: Compile crash on non-ObjectiveC platform
+// https://github.com/OpenSwiftUIProject/OpenSwiftUI/issues/39
+#if canImport(Darwin)
+extension BodyAccessor {
+    func makeBody(
+        container: _GraphValue<Container>,
+        inputs: inout _GraphInputs,
+        fields: DynamicPropertyCache.Fields
+    ) -> (_GraphValue<Body>, _DynamicPropertyBuffer?) {
+        guard Body.self != Never.self else {
+            fatalError("\(Body.self) may not have Body == Never")
+        }
+        return withUnsafeMutablePointer(to: &inputs) { inputsPointer in
+            func project<Flags: RuleThreadFlags>(flags _: Flags.Type) -> (_GraphValue<Body>, _DynamicPropertyBuffer?) {
+                let buffer = _DynamicPropertyBuffer(
+                    fields: fields,
+                    container: container,
+                    inputs: &inputsPointer.pointee
+                )
+                if buffer._count == 0 {
+                    buffer.destroy()
+                    let body = StaticBody<Self, Flags>(
+                        accessor: self,
+                        container: container.value
+                    )
+                    return (_GraphValue(body), nil)
+                } else {
+                    let body = DynamicBody<Self, Flags>(
+                        accessor: self,
+                        container: container.value,
+                        phase: inputsPointer.pointee.phase,
+                        links: buffer,
+                        resetSeed: 0
+                    )
+                    return (_GraphValue(body), buffer)
+                }
+            }
+            if fields.behaviors.contains(.asyncThread) {
+                return project(flags: AsyncThreadFlags.self)
+            } else {
+                return project(flags: MainThreadFlags.self)
+            }
+        }
+    }
+}
+
+// MARK: - RuleThreadFlags
+
+private protocol RuleThreadFlags {
+    static var value: OGAttributeTypeFlags { get }
+}
+
+private struct AsyncThreadFlags: RuleThreadFlags {
+    static var value: OGAttributeTypeFlags { .asyncThread }
+}
+
+private struct MainThreadFlags: RuleThreadFlags {
+    static var value: OGAttributeTypeFlags { .mainThread }
+}
+
+// MARK: - StaticBody
+
+private struct StaticBody<Accessor: BodyAccessor, ThreadFlags: RuleThreadFlags> {
+    let accessor: Accessor
+    @Attribute
+    var container: Accessor.Container
+
+    init(accessor: Accessor, container: Attribute<Accessor.Container>) {
+        self.accessor = accessor
+        self._container = container
+    }
+}
+
+extension StaticBody: StatefulRule {
+    typealias Value = Accessor.Body
+
+    func updateValue() {
+        accessor.updateBody(of: container, changed: true)
+    }
+}
+
+extension StaticBody: _AttributeBody {
+    static var flags: OGAttributeTypeFlags {
+        ThreadFlags.value
+    }
+}
+
+extension StaticBody: BodyAccessorRule {
+    static var container: Any.Type {
+        Accessor.Container.self
+    }
+
+    static func buffer<Value>(as type: Value.Type, attribute: OGAttribute) -> _DynamicPropertyBuffer? {
+        nil
+    }
+
+    static func value<Value>(as type: Value.Type, attribute: OGAttribute) -> Value? {
+        guard container == type else {
+            return nil
+        }
+        return (attribute.info.body.assumingMemoryBound(to: Self.self).pointee.container as! Value)
+    }
+
+    static func metaProperties<Value>(as type: Value.Type, attribute: OGAttribute) -> [(String, OGAttribute)] {
+        guard container == type else {
+            return []
+        }
+        return [("@self", attribute.info.body.assumingMemoryBound(to: Self.self).pointee._container.identifier)]
+    }
+}
+
+extension StaticBody: CustomStringConvertible {
+    var description: String { "\(Accessor.Body.self)" }
+}
+
+// MARK: - DynamicBody
+
+// TODO
+private struct DynamicBody<Accessor: BodyAccessor, ThreadFlags: RuleThreadFlags> {
+    let accessor: Accessor
+    @Attribute
+    var container: Accessor.Container
+    @Attribute
+    var phase: _GraphInputs.Phase
+    var links: _DynamicPropertyBuffer
+    var resetSeed: UInt32
+
+    init(
+        accessor: Accessor,
+        container: Attribute<Accessor.Container>,
+        phase: Attribute<_GraphInputs.Phase>,
+        links: _DynamicPropertyBuffer,
+        resetSeed: UInt32
+    ) {
+        fatalError("TODO")
+//        self.accessor = accessor
+//        self._container = container
+//        self._phase = phase
+//        self.links = links
+//        self.resetSeed = resetSeed
+    }
+}
+
+extension DynamicBody: StatefulRule {
+    typealias Value = Accessor.Body
+
+    func updateValue() {
+        // TODO
+    }
+}
+#endif

Sources/OpenSwiftUI/DataAndStorage/ModelData/DynamicProperty/DynamicPropertyBehaviors.swift

@@ -8,4 +8,5 @@
 
 struct DynamicPropertyBehaviors: OptionSet {
     let rawValue: UInt32
+    static var asyncThread: DynamicPropertyBehaviors { .init(rawValue: 1 << 0) }
 }

Sources/OpenSwiftUI/DataAndStorage/ModelData/DynamicProperty/DynamicPropertyBuffer.swift

@@ -26,7 +26,7 @@ public struct _DynamicPropertyBuffer {
         fields: DynamicPropertyCache.Fields,
         container: _GraphValue<Value>,
         inputs: inout _GraphInputs,
-        baseOffset: Int
+        baseOffset: Int = 0
     ) {
         self.init()
         addFields(fields, container: container, inputs: &inputs, baseOffset: baseOffset)

Sources/OpenSwiftUI/DataAndStorage/ModelData/DynamicProperty/DynamicPropertyCache.swift

@@ -113,50 +113,3 @@ extension DynamicPropertyCache {
         var fields: [Field]
     }
 }
-
-// MARK: - EmbeddedDynamicPropertyBox
-
-private struct EmbeddedDynamicPropertyBox<Value: DynamicProperty>: DynamicPropertyBox {
-    typealias Property = Value
-    func destroy() {}
-    func reset() {}
-    func update(property: inout Property, phase _: _GraphInputs.Phase) -> Bool {
-        property.update()
-        return false
-    }
-}
-
-extension DynamicProperty {
-    public static func _makeProperty<Value>(
-        in buffer: inout _DynamicPropertyBuffer,
-        container: _GraphValue<Value>,
-        fieldOffset: Int,
-        inputs: inout _GraphInputs
-    ) {
-        makeEmbeddedProperties(
-            in: &buffer,
-            container: container,
-            fieldOffset: fieldOffset,
-            inputs: &inputs
-        )
-        buffer.append(
-            EmbeddedDynamicPropertyBox<Self>(),
-            fieldOffset: fieldOffset
-        )
-    }
-
-    static func makeEmbeddedProperties<Value>(
-        in buffer: inout _DynamicPropertyBuffer,
-        container: _GraphValue<Value>,
-        fieldOffset: Int,
-        inputs: inout _GraphInputs
-    ) -> () {
-        let fields = DynamicPropertyCache.fields(of: self)
-        buffer.addFields(
-            fields,
-            container: container,
-            inputs: &inputs,
-            baseOffset: fieldOffset
-        )
-    }
-}

Sources/OpenSwiftUI/Internal/BodyAccessor/BodyAccessor.swift

@@ -0,0 +1,13 @@
+//
+//  BodyAccessor.swift
+//  OpenSwiftUI
+//
+//  Created by Kyle on 2024/2/21.
+//  Lastest Version: iOS 15.5
+//  Status: Complete
+
+protocol BodyAccessor<Container, Body> {
+    associatedtype Container
+    associatedtype Body
+    func updateBody(of: Container, changed: Bool)
+}

Sources/OpenSwiftUI/Internal/BodyAccessor/BodyAccessorRule.swift

@@ -0,0 +1,16 @@
+//
+//  BodyAccessorRule.swift
+//  OpenSwiftUI
+//
+//  Created by Kyle on 2024/2/21.
+//  Lastest Version: iOS 15.5
+//  Status: Complete
+
+internal import OpenGraphShims
+
+protocol BodyAccessorRule {
+    static var container: Any.Type { get }
+    static func value<Value>(as: Value.Type, attribute: OGAttribute) -> Value?
+    static func buffer<Value>(as: Value.Type, attribute: OGAttribute) -> _DynamicPropertyBuffer?
+    static func metaProperties<Value>(as: Value.Type, attribute: OGAttribute) -> [(String, OGAttribute)]
+}

Sources/OpenSwiftUI/Internal/Graph/_Graph.swift → Sources/OpenSwiftUI/Internal/Graph/Graph.swift

@@ -1,10 +1,9 @@
 //
-//  _Graph.swift
+//  Graph.swift
 //  OpenSwiftUI
 //
 //  Created by Kyle on 2023/9/24.
 //  Lastest Version: iOS 15.5
 //  Status: Complete
 
-public struct _Graph {
-}
+public struct _Graph {}