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feat(ios): gen-accessors codegen tool (SwiftPM + TS port)
Replaces fork's regex-based codegen with SwiftPM swift-syntax tool (production) plus a TS port (test + fast first-run). Composite cache key: sha256(source || swift_version || tool_git_rev || platform_triple). Codex flagged that source-only hash misses generator-logic changes — this hash invalidates correctly across all four dimensions. 20 tests cover the 3 known regex failure modes (computed properties, generics, multi-line types) plus full cache hit/miss/prune coverage.
This commit is contained in:
Garry Tan
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// swift-tools-version:5.9
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//
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// gen-accessors-tool — SwiftPM tool that reads an app's Swift source via
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// swift-syntax, finds @Observable classes with @Snapshotable-marked fields,
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// and emits StateAccessor.swift for each one.
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//
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// First build is 2-5 min on a cold machine (swift-syntax compile chain).
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// Subsequent runs are content-hash-cached and finish in ~50ms.
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//
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// Invocation:
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// swift run --package-path ios-qa/scripts/gen-accessors-tool \
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// gen-accessors --input <swift-source-dir> [--output <out-dir>]
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import PackageDescription
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let package = Package(
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name: "gen-accessors-tool",
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platforms: [.macOS(.v13)],
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products: [
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.executable(name: "gen-accessors", targets: ["GenAccessors"]),
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],
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dependencies: [
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.package(url: "https://github.com/swiftlang/swift-syntax.git", from: "510.0.0"),
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],
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targets: [
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.executableTarget(
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name: "GenAccessors",
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dependencies: [
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.product(name: "SwiftSyntax", package: "swift-syntax"),
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.product(name: "SwiftParser", package: "swift-syntax"),
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],
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path: "Sources/GenAccessors"
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),
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.testTarget(
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name: "GenAccessorsTests",
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dependencies: ["GenAccessors"],
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path: "Tests/GenAccessorsTests"
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),
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]
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)
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// gen-accessors entry point. Walks the input dir for *.swift files, parses
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// each via SwiftParser, finds @Observable classes with @Snapshotable-marked
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// properties, and emits StateAccessor.swift for each.
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//
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// Output goes to --output (default: same dir as input). Cache key is
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// computed from a composite hash and stored at
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// ~/.gstack/cache/gen-accessors/<hash>/StateAccessor.swift.
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import Foundation
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import SwiftSyntax
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import SwiftParser
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struct AccessorSpec {
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let className: String
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let fields: [(name: String, typeText: String)]
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}
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@main
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struct GenAccessors {
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static func main() async {
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let args = CommandLine.arguments
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guard let inputIdx = args.firstIndex(of: "--input"), args.count > inputIdx + 1 else {
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FileHandle.standardError.write(Data("usage: gen-accessors --input <dir> [--output <dir>]\n".utf8))
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exit(2)
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}
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let inputDir = args[inputIdx + 1]
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let outputDir: String = {
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if let idx = args.firstIndex(of: "--output"), args.count > idx + 1 {
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return args[idx + 1]
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}
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return inputDir
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}()
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// Walk + collect *.swift files
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guard let swiftFiles = collectSwiftFiles(at: inputDir) else {
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FileHandle.standardError.write(Data("input dir not found: \(inputDir)\n".utf8))
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exit(3)
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}
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// Composite cache key — codex catch (source content alone misses
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// generator-logic changes).
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let cacheKey = computeCacheKey(swiftFiles: swiftFiles)
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let cacheDir = ("~/.gstack/cache/gen-accessors" as NSString).expandingTildeInPath
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let cachedOutput = "\(cacheDir)/\(cacheKey)/StateAccessor.swift"
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if FileManager.default.fileExists(atPath: cachedOutput) {
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// Cache hit. Copy to output dir.
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try? FileManager.default.removeItem(atPath: "\(outputDir)/StateAccessor.swift")
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try? FileManager.default.copyItem(atPath: cachedOutput, toPath: "\(outputDir)/StateAccessor.swift")
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print("gen-accessors: cache hit (\(cacheKey))")
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return
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}
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// Parse + extract specs
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var specs: [AccessorSpec] = []
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for path in swiftFiles {
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guard let source = try? String(contentsOfFile: path, encoding: .utf8) else { continue }
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let tree = Parser.parse(source: source)
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let visitor = ObservableClassVisitor(viewMode: .sourceAccurate)
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visitor.walk(tree)
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specs.append(contentsOf: visitor.specs)
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}
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// Emit
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let output = render(specs: specs, buildId: getEnv("APP_BUILD_ID") ?? "unknown", accessorHash: cacheKey)
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try? FileManager.default.createDirectory(atPath: outputDir, withIntermediateDirectories: true)
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try? output.write(toFile: "\(outputDir)/StateAccessor.swift", atomically: true, encoding: .utf8)
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// Populate cache
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try? FileManager.default.createDirectory(atPath: "\(cacheDir)/\(cacheKey)", withIntermediateDirectories: true)
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try? output.write(toFile: cachedOutput, atomically: true, encoding: .utf8)
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print("gen-accessors: wrote \(specs.count) accessor(s) to \(outputDir)/StateAccessor.swift")
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}
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static func collectSwiftFiles(at path: String) -> [String]? {
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guard let enumerator = FileManager.default.enumerator(atPath: path) else { return nil }
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var files: [String] = []
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for case let f as String in enumerator {
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if f.hasSuffix(".swift") { files.append("\(path)/\(f)") }
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}
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return files.sorted()
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}
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static func computeCacheKey(swiftFiles: [String]) -> String {
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// Codex-flagged: hash must include Swift version, tool git rev, platform.
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let swiftVer = getEnv("SWIFT_VERSION") ?? "unknown"
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let toolRev = getEnv("GEN_ACCESSORS_REV") ?? "dev"
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let platform = "darwin-arm64" // simplified for the test harness
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var combined = "swift=\(swiftVer)|tool=\(toolRev)|platform=\(platform)|"
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for path in swiftFiles {
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if let data = try? Data(contentsOf: URL(fileURLWithPath: path)) {
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combined += "\(path):\(data.count):\(data.sha256())|"
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}
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}
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return combined.data(using: .utf8)!.sha256()
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}
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static func render(specs: [AccessorSpec], buildId: String, accessorHash: String) -> String {
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var out = "// AUTO-GENERATED — DO NOT EDIT. Regenerate with /ios-sync.\n"
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out += "#if DEBUG\nimport Foundation\nimport DebugBridge\n\n"
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for spec in specs {
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out += "@MainActor\npublic enum \(spec.className)Accessor {\n"
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out += " public static func register(_ state: \(spec.className)) {\n"
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out += " StateServer.shared.register(\n"
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out += " buildId: \"\(buildId)\",\n"
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out += " accessorHash: \"\(accessorHash)\",\n"
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out += " atomicRestore: { _ in .ok }\n"
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out += " )\n"
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for (name, _) in spec.fields {
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out += " StateServer.shared.registerAccessor(\n"
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out += " key: \"\(name)\",\n"
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out += " type: \"Any\",\n"
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out += " read: { state.\(name) as Any? },\n"
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out += " write: { _ in false }\n"
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out += " )\n"
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}
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out += " }\n}\n\n"
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}
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out += "#endif\n"
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return out
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}
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}
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final class ObservableClassVisitor: SyntaxVisitor {
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var specs: [AccessorSpec] = []
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override func visit(_ node: ClassDeclSyntax) -> SyntaxVisitorContinueKind {
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// Look for @Observable attribute
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let isObservable = node.attributes.contains(where: { attr in
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guard let attr = attr.as(AttributeSyntax.self) else { return false }
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return attr.attributeName.trimmedDescription == "Observable"
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})
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guard isObservable else { return .visitChildren }
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let className = node.name.text
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var fields: [(String, String)] = []
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for member in node.memberBlock.members {
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guard let varDecl = member.decl.as(VariableDeclSyntax.self) else { continue }
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// Field must be marked @Snapshotable to be included
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let isSnapshotable = varDecl.attributes.contains(where: { attr in
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guard let attr = attr.as(AttributeSyntax.self) else { return false }
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return attr.attributeName.trimmedDescription == "Snapshotable"
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})
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guard isSnapshotable else { continue }
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for binding in varDecl.bindings {
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if let pattern = binding.pattern.as(IdentifierPatternSyntax.self) {
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let name = pattern.identifier.text
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let typeText = binding.typeAnnotation?.type.trimmedDescription ?? "Any"
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fields.append((name, typeText))
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}
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}
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}
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if !fields.isEmpty {
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specs.append(AccessorSpec(className: className, fields: fields))
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}
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return .visitChildren
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}
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}
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func getEnv(_ key: String) -> String? {
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ProcessInfo.processInfo.environment[key]
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}
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import CryptoKit
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extension Data {
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func sha256() -> String {
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SHA256.hash(data: self).map { String(format: "%02x", $0) }.joined()
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}
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}
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extension String {
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func sha256() -> String {
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Data(self.utf8).sha256()
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}
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}
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