Initial commit

.gitignore

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+.DS_Store
+/.build
+/Packages
+xcuserdata/
+DerivedData/
+.swiftpm/configuration/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.netrc

.swiftpm/xcode/package.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

Package.swift

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+// swift-tools-version: 5.9
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "ProgrammaticCoreData",
+    platforms: [
+        .macOS(.v14),
+        .iOS(.v17)
+    ],
+    products: [
+        .library(
+            name: "ProgrammaticCoreData",
+            targets: ["ProgrammaticCoreData"]),
+    ],
+    targets: [
+        .target(
+            name: "ProgrammaticCoreData"),
+        .testTarget(
+            name: "ProgrammaticCoreDataTests",
+            dependencies: ["ProgrammaticCoreData"]),
+    ]
+)

Sources/ProgrammaticCoreData/CoreDataCreationError.swift

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+//  Created by Axel Ancona Esselmann on 2/24/24.
+//
+
+import Foundation
+
+public enum CoreDataCreationError: Error {
+    case storeDescriptionMissing
+}

Sources/ProgrammaticCoreData/EntityDescriptionAttribute.swift

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+//  Created by Axel Ancona Esselmann on 2/24/24.
+//
+
+import CoreData
+
+public enum EntityDescriptionAttribute<CoreDataEntity, T> {
+    case undefined(KeyPath<CoreDataEntity, T>)
+    case integer16(KeyPath<CoreDataEntity, T>)
+    case integer32(KeyPath<CoreDataEntity, T>)
+    case integer64(KeyPath<CoreDataEntity, T>)
+    case decimal(KeyPath<CoreDataEntity, T>)
+    case double(KeyPath<CoreDataEntity, T>)
+    case float(KeyPath<CoreDataEntity, T>)
+    case string(KeyPath<CoreDataEntity, T>)
+    case boolean(KeyPath<CoreDataEntity, T>)
+    case date(KeyPath<CoreDataEntity, T>)
+    case binaryData(KeyPath<CoreDataEntity, T>)
+    case uuid(KeyPath<CoreDataEntity, T>)
+    case uri(KeyPath<CoreDataEntity, T>)
+    case transformable(KeyPath<CoreDataEntity, T>)
+    case objectID(KeyPath<CoreDataEntity, T>)
+    case composite(KeyPath<CoreDataEntity, T>)
+
+    public var attributeType: NSAttributeType {
+        switch self {
+        case .undefined:
+            return .undefinedAttributeType
+        case .integer16:
+            return .integer16AttributeType
+        case .integer32:
+            return .integer32AttributeType
+        case .integer64:
+            return .integer64AttributeType
+        case .decimal:
+            return .decimalAttributeType
+        case .double:
+            return .doubleAttributeType
+        case .float:
+            return .floatAttributeType
+        case .string:
+            return .stringAttributeType
+        case .boolean:
+            return .booleanAttributeType
+        case .date:
+            return .dateAttributeType
+        case .binaryData:
+            return .binaryDataAttributeType
+        case .uuid:
+            return .UUIDAttributeType
+        case .uri:
+            return .URIAttributeType
+        case .transformable:
+            return .transformableAttributeType
+        case .objectID:
+            return .objectIDAttributeType
+        case .composite:
+            return .compositeAttributeType
+        }
+    }
+
+    public var keyPath: KeyPath<CoreDataEntity, T> {
+        switch self {
+        case
+            .undefined(let keyPath),
+            .integer16(let keyPath),
+            .integer32(let keyPath),
+            .integer64(let keyPath),
+            .decimal(let keyPath),
+            .double(let keyPath),
+            .float(let keyPath),
+            .string(let keyPath),
+            .boolean(let keyPath),
+            .date(let keyPath),
+            .binaryData(let keyPath),
+            .uuid(let keyPath),
+            .uri(let keyPath),
+            .transformable(let keyPath),
+            .objectID(let keyPath),
+            .composite(let keyPath):
+            return keyPath
+        }
+    }
+
+    public var nsAttributeType: NSAttributeDescription {
+        NSAttributeDescription(
+            name: NSExpression(forKeyPath: keyPath).keyPath,
+            type: attributeType,
+            defaultValue: nil
+        )
+    }
+}

Sources/ProgrammaticCoreData/NSAttributeDescription+Extensions.swift

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+//  Created by Axel Ancona Esselmann on 2/24/24.
+//
+
+import CoreData
+
+public extension NSAttributeDescription {
+    convenience init(name: String, type: NSAttributeType, defaultValue: Any? = nil) {
+        self.init()
+        self.name = name
+        self.attributeType = type
+        self.defaultValue = defaultValue
+    }
+}