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| 1 | +// |
| 2 | +// DynamicPropertyCache.swift |
| 3 | +// OpenSwiftUI |
| 4 | +// |
| 5 | +// Created by Kyle on 2024/1/10. |
| 6 | +// Lastest Version: iOS 15.5 |
| 7 | +// Status: Complete |
| 8 | +// ID: 49D2A32E637CD497C6DE29B8E060A506 |
| 9 | + |
| 10 | +internal import OpenGraphShims |
| 11 | + |
| 12 | +// MARK: - DynamicPropertyCache |
| 13 | + |
| 14 | +struct DynamicPropertyCache { |
| 15 | + private static var cache = MutableBox([ObjectIdentifier: Fields]()) |
| 16 | + |
| 17 | + static func fields(of type: Any.Type) -> Fields { |
| 18 | + if let fields = cache.value[ObjectIdentifier(type)] { |
| 19 | + return fields |
| 20 | + } |
| 21 | + let fields: Fields |
| 22 | + let typeID = OGTypeID(type) |
| 23 | + switch typeID.kind { |
| 24 | + case .enum, .optional: |
| 25 | + var taggedFields: [TaggedFields] = [] |
| 26 | + _ = typeID.forEachField(options: [._2, ._4]) { name, offset, fieldType in |
| 27 | + var fields: [Field] = [] |
| 28 | + let tupleType = OGTupleType(fieldType) |
| 29 | + for index in tupleType.indices { |
| 30 | + guard let dynamicPropertyType = tupleType.type(at: index) as? DynamicProperty.Type else { |
| 31 | + break |
| 32 | + } |
| 33 | + let offset = tupleType.offset(at: index) |
| 34 | + let field = Field(type: dynamicPropertyType, offset: offset, name: name) |
| 35 | + fields.append(field) |
| 36 | + } |
| 37 | + if !fields.isEmpty { |
| 38 | + let taggedField = TaggedFields(tag: offset, fields: fields) |
| 39 | + taggedFields.append(taggedField) |
| 40 | + } |
| 41 | + return true |
| 42 | + } |
| 43 | + fields = Fields(layout: .sum(type, taggedFields)) |
| 44 | + case .struct, .tuple: |
| 45 | + var fieldArray: [Field] = [] |
| 46 | + _ = typeID.forEachField(options: [._2]) { name, offset, fieldType in |
| 47 | + guard let dynamicPropertyType = fieldType as? DynamicProperty.Type else { |
| 48 | + return true |
| 49 | + } |
| 50 | + let field = Field(type: dynamicPropertyType, offset: offset, name: name) |
| 51 | + fieldArray.append(field) |
| 52 | + return true |
| 53 | + } |
| 54 | + fields = Fields(layout: .product(fieldArray)) |
| 55 | + default: |
| 56 | + fields = Fields(layout: .product([])) |
| 57 | + break |
| 58 | + } |
| 59 | + if fields.behaviors.contains(.init(rawValue: 3)) { |
| 60 | + Log.runtimeIssues("%s is marked async, but contains properties that require the main thread.", [_typeName(type)]) |
| 61 | + } |
| 62 | + cache.value[ObjectIdentifier(type)] = fields |
| 63 | + return fields |
| 64 | + } |
| 65 | +} |
| 66 | + |
| 67 | +// MARK: - DynamicPropertyCache.Fields |
| 68 | + |
| 69 | +extension DynamicPropertyCache { |
| 70 | + struct Fields { |
| 71 | + var layout: Layout |
| 72 | + var behaviors: DynamicPropertyBehaviors |
| 73 | + |
| 74 | + enum Layout { |
| 75 | + case product([Field]) |
| 76 | + case sum(Any.Type, [TaggedFields]) |
| 77 | + } |
| 78 | + |
| 79 | + init(layout: Layout) { |
| 80 | + var behaviors: UInt32 = 0 |
| 81 | + switch layout { |
| 82 | + case let .product(fields): |
| 83 | + for field in fields { |
| 84 | + behaviors |= field.type._propertyBehaviors |
| 85 | + } |
| 86 | + case let .sum(_, taggedFields): |
| 87 | + for taggedField in taggedFields { |
| 88 | + for field in taggedField.fields { |
| 89 | + behaviors |= field.type._propertyBehaviors |
| 90 | + } |
| 91 | + } |
| 92 | + } |
| 93 | + self.layout = layout |
| 94 | + self.behaviors = .init(rawValue: behaviors) |
| 95 | + } |
| 96 | + } |
| 97 | +} |
| 98 | + |
| 99 | +// MARK: - DynamicPropertyCache.Field |
| 100 | + |
| 101 | +extension DynamicPropertyCache { |
| 102 | + struct Field { |
| 103 | + var type: DynamicProperty.Type |
| 104 | + var offset: Int |
| 105 | + var name: UnsafePointer<Int8>? |
| 106 | + } |
| 107 | +} |
| 108 | + |
| 109 | +// MARK: - DynamicPropertyCache.TaggedFields |
| 110 | + |
| 111 | +extension DynamicPropertyCache { |
| 112 | + struct TaggedFields { |
| 113 | + var tag: Int |
| 114 | + var fields: [Field] |
| 115 | + } |
| 116 | +} |
| 117 | + |
| 118 | +// MARK: - EmbeddedDynamicPropertyBox |
| 119 | + |
| 120 | +private struct EmbeddedDynamicPropertyBox<Value: DynamicProperty>: DynamicPropertyBox { |
| 121 | + typealias Property = Value |
| 122 | + func destroy() {} |
| 123 | + func reset() {} |
| 124 | + func update(property: inout Property, phase _: _GraphInputs.Phase) -> Bool { |
| 125 | + property.update() |
| 126 | + return false |
| 127 | + } |
| 128 | +} |
| 129 | + |
| 130 | +extension DynamicProperty { |
| 131 | + public static func _makeProperty<Value>( |
| 132 | + in buffer: inout _DynamicPropertyBuffer, |
| 133 | + container: _GraphValue<Value>, |
| 134 | + fieldOffset: Int, |
| 135 | + inputs: inout _GraphInputs |
| 136 | + ) { |
| 137 | + makeEmbeddedProperties( |
| 138 | + in: &buffer, |
| 139 | + container: container, |
| 140 | + fieldOffset: fieldOffset, |
| 141 | + inputs: &inputs |
| 142 | + ) |
| 143 | + buffer.append( |
| 144 | + EmbeddedDynamicPropertyBox<Self>(), |
| 145 | + fieldOffset: fieldOffset |
| 146 | + ) |
| 147 | + } |
| 148 | + |
| 149 | + static func makeEmbeddedProperties<Value>( |
| 150 | + in buffer: inout _DynamicPropertyBuffer, |
| 151 | + container: _GraphValue<Value>, |
| 152 | + fieldOffset: Int, |
| 153 | + inputs: inout _GraphInputs |
| 154 | + ) -> () { |
| 155 | + let fields = DynamicPropertyCache.fields(of: self) |
| 156 | + buffer.addFields( |
| 157 | + fields, |
| 158 | + container: container, |
| 159 | + inputs: &inputs, |
| 160 | + baseOffset: fieldOffset |
| 161 | + ) |
| 162 | + } |
| 163 | +} |
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