| 1 | import Foundation |
| 2 | |
| 3 | // 🤖 The Swift twin of web/static/flow.js: the interpreter for the |
| 4 | // conversation scripts (docs/conversation-scripts.md) — the JSON documents |
| 5 | // that ARE Eleven's onboarding conversations (setup.flow.js, welcome.flow.js). |
| 6 | // The docs promised "the document the server will ship to native |
| 7 | // interpreters"; this is that interpreter. Byte-identical copies of the flow |
| 8 | // data are bundled in Flows/ (drift-gated by test/flow.test.mjs), and the two |
| 9 | // engines are held together by mirrored tests (FlowEngineTests ↔ |
| 10 | // test/flow.test.mjs) — change semantics on one side and the other changes in |
| 11 | // the same PR. |
| 12 | // |
| 13 | // Same shape as flow.js: a pure-data walker over steps (entries, skipIf, |
| 14 | // bubbles, chips, inputs, effects with result branching, settle polls), with |
| 15 | // ALL side effects behind the io surface — say, ask, verbs, records, delays. |
| 16 | // The engine never touches the network, crypto, or UI. |
| 17 | |
| 18 | // MARK: - FlowJSON: a minimal dynamic JSON value for the flow documents |
| 19 | |
| 20 | public indirect enum FlowJSON: Equatable, Sendable { |
| 21 | case null |
| 22 | case bool(Bool) |
| 23 | case number(Double) |
| 24 | case string(String) |
| 25 | case array([FlowJSON]) |
| 26 | case object([String: FlowJSON]) |
| 27 | |
| 28 | public init(any: Any?) { |
| 29 | switch any { |
| 30 | case nil, is NSNull: self = .null |
| 31 | case let n as NSNumber: |
| 32 | if CFGetTypeID(n as CFTypeRef) == CFBooleanGetTypeID() { self = .bool(n.boolValue) } |
| 33 | else { self = .number(n.doubleValue) } |
| 34 | case let s as String: self = .string(s) |
| 35 | case let a as [Any]: self = .array(a.map { FlowJSON(any: $0) }) |
| 36 | case let o as [String: Any]: self = .object(o.mapValues { FlowJSON(any: $0) }) |
| 37 | default: self = .null |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | public static func parse(_ data: Data) -> FlowJSON? { |
| 42 | guard let any = try? JSONSerialization.jsonObject(with: data, options: [.fragmentsAllowed]) else { return nil } |
| 43 | return FlowJSON(any: any) |
| 44 | } |
| 45 | |
| 46 | public subscript(key: String) -> FlowJSON { |
| 47 | if case .object(let o) = self { return o[key] ?? .null } |
| 48 | return .null |
| 49 | } |
| 50 | |
| 51 | public var arrayValue: [FlowJSON] { |
| 52 | if case .array(let a) = self { return a } |
| 53 | return [] |
| 54 | } |
| 55 | |
| 56 | public var stringValue: String? { |
| 57 | if case .string(let s) = self { return s } |
| 58 | return nil |
| 59 | } |
| 60 | |
| 61 | public var isNull: Bool { self == .null } |
| 62 | |
| 63 | var truthy: Bool { |
| 64 | switch self { |
| 65 | case .null: return false |
| 66 | case .bool(let b): return b |
| 67 | case .number(let n): return n != 0 && !n.isNaN |
| 68 | case .string(let s): return !s.isEmpty |
| 69 | case .array(let a): return !a.isEmpty |
| 70 | case .object: return true |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | var display: String { |
| 75 | switch self { |
| 76 | case .string(let s): return s |
| 77 | case .number(let n): |
| 78 | if n.isFinite, n == n.rounded(), abs(n) < 9e15 { return String(Int64(n)) } |
| 79 | return String(n) |
| 80 | case .bool(let b): return b ? "true" : "false" |
| 81 | default: return "" |
| 82 | } |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | // MARK: - the environment |
| 87 | |
| 88 | // The flow's env: template/condition state plus the bridge closures. Dotted |
| 89 | // paths resolve exactly as flow.js does — "done"/"done.X" through the io, |
| 90 | // "vars.*" and "space.*" into their dictionaries, "bridge.*" through closures |
| 91 | // (called), everything else through `flags` ("native", "suggested", |
| 92 | // "inviterName", …; closures allowed for live reads like accessBackedUp). |
| 93 | @MainActor |
| 94 | public final class FlowEnv { |
| 95 | public var vars: [String: FlowJSON] = [:] |
| 96 | public var space: [String: FlowJSON] = [:] |
| 97 | public var flags: [String: FlowJSON] = [:] |
| 98 | /// Live lookups (bridge.myName, accessBackedUp, …) — resolved per read. |
| 99 | public var live: [String: () -> FlowJSON] = [:] |
| 100 | var ack = "" |
| 101 | var resumed = false |
| 102 | /// Set by the engine on entry to each step ("done" resolves through it). |
| 103 | var currentStepDone: () -> Bool = { false } |
| 104 | var doneOf: (String) -> Bool = { _ in false } |
| 105 | public var onEnd: () -> Void = {} |
| 106 | |
| 107 | public init() {} |
| 108 | |
| 109 | func resolve(_ path: String) -> FlowJSON { |
| 110 | if path == "done" { return .bool(currentStepDone()) } |
| 111 | if path.hasPrefix("done.") { return .bool(doneOf(String(path.dropFirst(5)))) } |
| 112 | if path == "resumed" { return .bool(resumed) } |
| 113 | let parts = path.split(separator: ".").map(String.init) |
| 114 | guard let first = parts.first else { return .null } |
| 115 | var cur: FlowJSON |
| 116 | if first == "vars" { |
| 117 | cur = .object(vars) |
| 118 | } else if first == "space" { |
| 119 | cur = .object(space) |
| 120 | } else if first == "bridge", parts.count > 1, let fn = live["bridge." + parts[1]] { |
| 121 | return fn() |
| 122 | } else if let fn = live[path] { |
| 123 | return fn() |
| 124 | } else if let fn = live[first] { |
| 125 | cur = fn() |
| 126 | for p in parts.dropFirst() { cur = cur[p] } |
| 127 | return cur |
| 128 | } else if let v = flags[first] { |
| 129 | cur = v |
| 130 | } else { |
| 131 | return .null |
| 132 | } |
| 133 | for p in parts.dropFirst() { cur = cur[p] } |
| 134 | return cur |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | // MARK: - the name-step answer cleaner (input.clean == "name") |
| 139 | |
| 140 | // People answer a conversational "what should folks here call you?" |
| 141 | // conversationally — "I'm Dermot", "hi, my name is Ana." — and the raw reply |
| 142 | // used to become their screen name verbatim (a real member spent days as |
| 143 | // "I'm Dermot"). Strip one leading greeting, one leading preamble, and any |
| 144 | // trailing punctuation; if stripping eats everything, keep the trimmed |
| 145 | // original — never clean a name to nothing. Prefix lists are matched on a |
| 146 | // lowercased, straight-apostrophe copy (iOS keyboards type ’), longest |
| 147 | // preamble first so "i'm called" wins over "i'm". |
| 148 | // Twin: cleanNameAnswer in web/static/flow.js. |
| 149 | private let nameGreetings = ["hiya", "howdy", "hello", "hey", "hi"] |
| 150 | private let namePreambles = [ |
| 151 | "you can call me", "everyone calls me", "people call me", "they call me", |
| 152 | "i'm called", "i am called", "my name is", "my name's", "the name's", |
| 153 | "name is", "name's", "call me", "i am", "i'm", "im", "it's", "its", |
| 154 | ] |
| 155 | |
| 156 | func cleanNameAnswer(_ raw: String) -> String { |
| 157 | let original = raw.trimmingCharacters(in: .whitespacesAndNewlines) |
| 158 | var s = original |
| 159 | func lower() -> String { s.lowercased().replacingOccurrences(of: "\u{2019}", with: "'") } |
| 160 | for g in nameGreetings { |
| 161 | guard lower().hasPrefix(g) else { continue } |
| 162 | // The greeting must end at punctuation-or-space ("hi," yes, "hilary" no). |
| 163 | var i = s.index(s.startIndex, offsetBy: g.count) |
| 164 | if i < s.endIndex, ",.!".contains(s[i]) { i = s.index(after: i) } |
| 165 | if i < s.endIndex, s[i] == " " { |
| 166 | s = String(s[s.index(after: i)...]).trimmingCharacters(in: .whitespaces) |
| 167 | } |
| 168 | break |
| 169 | } |
| 170 | let l = lower() |
| 171 | for p in namePreambles where l.hasPrefix(p + " ") { |
| 172 | s = String(s.dropFirst(p.count + 1)).trimmingCharacters(in: .whitespaces) |
| 173 | break |
| 174 | } |
| 175 | while let last = s.last, ".!,;:".contains(last) { s.removeLast() } |
| 176 | s = s.trimmingCharacters(in: .whitespaces) |
| 177 | return s.isEmpty ? original : s |
| 178 | } |
| 179 | |
| 180 | // MARK: - the io surface |
| 181 | |
| 182 | /// One tappable chip on a bubble. `spentLabel` is its past-tense form once |
| 183 | /// tapped; `isStale` ties liveness to the step (finish-line chips stay live). |
| 184 | /// `trailing` right-aligns the chip — the quiet alternative path (the quick |
| 185 | /// form) sits apart from the step's primary answers. |
| 186 | @MainActor |
| 187 | public final class FlowChip: Identifiable { |
| 188 | public let id = UUID() |
| 189 | public let label: String |
| 190 | public let spentLabel: String? |
| 191 | public let trailing: Bool |
| 192 | public let isStale: () -> Bool |
| 193 | public let run: () -> Void |
| 194 | init(label: String, spentLabel: String?, trailing: Bool = false, isStale: @escaping () -> Bool, run: @escaping () -> Void) { |
| 195 | self.label = label |
| 196 | self.spentLabel = spentLabel |
| 197 | self.trailing = trailing |
| 198 | self.isStale = isStale |
| 199 | self.run = run |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | /// Extra presentation riding a said line (mirrors makeSay's extra). |
| 204 | public struct FlowSayExtra: Sendable { |
| 205 | public var key: String? |
| 206 | public var hint: String? |
| 207 | public var attachHint: String? |
| 208 | /// The composer's inset field label ("Your name:") — the "To:" pattern. |
| 209 | public var label: String? |
| 210 | public var local = false |
| 211 | public var imgToken: String? |
| 212 | public var imgAlt = "" |
| 213 | public var imgRound = false |
| 214 | public init() {} |
| 215 | } |
| 216 | |
| 217 | /// A composer answer: the typed text plus any image attachment (photo steps). |
| 218 | public struct FlowAnswer: Sendable { |
| 219 | public var text: String |
| 220 | public var imageAttachment: [String: String]? // {id, type} when an image rode along |
| 221 | public init(text: String, imageAttachment: [String: String]? = nil) { |
| 222 | self.text = text |
| 223 | self.imageAttachment = imageAttachment |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | /// What the engine needs from its host — the exact io contract flow.js takes. |
| 228 | /// All methods are MainActor; say/verb/record are async (pacing, network). |
| 229 | @MainActor |
| 230 | public protocol FlowIO: AnyObject { |
| 231 | /// Speak one line (persist unless extra.local), with optional chips. |
| 232 | func say(_ text: String, chips: [FlowChip]?, extra: FlowSayExtra) async |
| 233 | /// Arm the one-shot answer waiter: the next composer send is the answer. |
| 234 | func ask(_ handler: @escaping (FlowAnswer) -> Void) |
| 235 | func cancelAnswer() |
| 236 | /// Run a bridge verb; nil/true → "ok", false → "error", string verbatim. |
| 237 | func verb(_ name: String, args: [FlowJSON]) async -> FlowJSON |
| 238 | /// Persist a completed step (the ✓ line): the app's `.step` event. |
| 239 | func record(step: String, label: String, value: String) async |
| 240 | /// Whether a step already recorded (folded from the thread's history). |
| 241 | func done(_ step: String) -> Bool |
| 242 | /// Schedule fn after ms (settle polls, chip probes). |
| 243 | func delay(ms: Double, _ fn: @escaping () -> Void) |
| 244 | } |
| 245 | |
| 246 | // MARK: - the engine |
| 247 | |
| 248 | @MainActor |
| 249 | public final class FlowEngine { |
| 250 | let flow: FlowJSON |
| 251 | let env: FlowEnv |
| 252 | weak var ioRef: AnyObject? |
| 253 | let io: FlowIO |
| 254 | private var steps: [String: (step: FlowJSON, next: String?)] = [:] |
| 255 | private var currentGo = OnceStep() |
| 256 | |
| 257 | public init(flow: FlowJSON, env: FlowEnv, io: FlowIO) { |
| 258 | self.flow = flow |
| 259 | self.env = env |
| 260 | self.io = io |
| 261 | let list = flow["steps"].arrayValue |
| 262 | for (i, s) in list.enumerated() { |
| 263 | guard let id = s["id"].stringValue else { continue } |
| 264 | let next = i + 1 < list.count ? list[i + 1]["id"].stringValue : nil |
| 265 | steps[id] = (s, next) |
| 266 | } |
| 267 | env.doneOf = { [weak self] id in self?.io.done(id) ?? false } |
| 268 | } |
| 269 | |
| 270 | // One-tap-wins step guard (flow.js onceStep). |
| 271 | final class OnceStep { |
| 272 | var taken = false |
| 273 | func callAsFunction(_ fn: () -> Void) { |
| 274 | if taken { return } |
| 275 | taken = true |
| 276 | fn() |
| 277 | } |
| 278 | } |
| 279 | |
| 280 | // MARK: conditions & templates (mirrors evalCond/template/renderText) |
| 281 | |
| 282 | public func evalCond(_ expr: FlowJSON) -> Bool { |
| 283 | switch expr { |
| 284 | case .null: return true |
| 285 | case .bool(let b): return b |
| 286 | case .object(let o): |
| 287 | if let all = o["all"] { return all.arrayValue.allSatisfy { evalCond($0) } } |
| 288 | if let any = o["any"] { return any.arrayValue.contains { evalCond($0) } } |
| 289 | return false |
| 290 | case .string(let s): |
| 291 | let neg = s.hasPrefix("!") |
| 292 | let v = env.resolve(neg ? String(s.dropFirst()) : s) |
| 293 | return neg ? !v.truthy : v.truthy |
| 294 | default: |
| 295 | return false |
| 296 | } |
| 297 | } |
| 298 | |
| 299 | public func template(_ s: String) -> String { |
| 300 | var out = "" |
| 301 | var i = s.startIndex |
| 302 | while i < s.endIndex { |
| 303 | if s[i] == "{" , let close = s[i...].firstIndex(of: "}") { |
| 304 | let body = String(s[s.index(after: i)..<close]) |
| 305 | if body == "ack?" { |
| 306 | let a = env.ack |
| 307 | env.ack = "" |
| 308 | out += a.isEmpty ? "" : a + "\n\n" |
| 309 | } else { |
| 310 | let parts = body.split(separator: "|", maxSplits: 1).map(String.init) |
| 311 | let v = env.resolve(parts[0].trimmingCharacters(in: .whitespaces)) |
| 312 | if v.isNull || v.display.isEmpty { |
| 313 | out += parts.count > 1 ? parts[1] : "" |
| 314 | } else { |
| 315 | out += v.display |
| 316 | } |
| 317 | } |
| 318 | i = s.index(after: close) |
| 319 | } else { |
| 320 | out.append(s[i]) |
| 321 | i = s.index(after: i) |
| 322 | } |
| 323 | } |
| 324 | return out |
| 325 | } |
| 326 | |
| 327 | public func renderText(_ t: FlowJSON) -> String { |
| 328 | switch t { |
| 329 | case .string(let s): return template(s) |
| 330 | case .array(let segs): |
| 331 | return segs.map { seg -> String in |
| 332 | if let str = seg.stringValue { return template(str) } |
| 333 | if !seg["if"].isNull || !seg["text"].isNull { |
| 334 | return evalCond(seg["if"]) ? template(seg["text"].stringValue ?? "") : "" |
| 335 | } |
| 336 | return "" |
| 337 | }.joined() |
| 338 | case .object(let o): |
| 339 | if o["if"] != nil { |
| 340 | let branch = evalCond(o["if"] ?? .null) ? o["then"] : o["else"] |
| 341 | return template(branch?.stringValue ?? "") |
| 342 | } |
| 343 | return "" |
| 344 | default: |
| 345 | return "" |
| 346 | } |
| 347 | } |
| 348 | |
| 349 | // "$answer"/"$answerText" read captured input; anything else templates. |
| 350 | func valueOf(_ v: FlowJSON) -> FlowJSON { |
| 351 | if let s = v.stringValue { |
| 352 | if s == "$answer" { return env.vars["answer"] ?? .null } |
| 353 | if s == "$answerText" { return env.vars["answerText"] ?? .null } |
| 354 | return .string(template(s)) |
| 355 | } |
| 356 | return v |
| 357 | } |
| 358 | |
| 359 | func setPaths(_ sets: FlowJSON) { |
| 360 | for (path, value) in sets.arrayPairs { |
| 361 | let parts = path.split(separator: ".").map(String.init) |
| 362 | let resolved: FlowJSON = value.stringValue != nil ? valueOf(value) : value |
| 363 | if parts.first == "vars", parts.count == 2 { |
| 364 | env.vars[parts[1]] = resolved |
| 365 | } else if parts.count == 1 { |
| 366 | env.flags[parts[0]] = resolved |
| 367 | } |
| 368 | } |
| 369 | } |
| 370 | |
| 371 | // Map a verb result onto a branch key (flow.js resultKey). |
| 372 | static func resultKey(_ r: FlowJSON) -> String { |
| 373 | if r.isNull { return "ok" } |
| 374 | if case .bool(let b) = r { return b ? "ok" : "error" } |
| 375 | return r.display |
| 376 | } |
| 377 | |
| 378 | // MARK: run |
| 379 | |
| 380 | public func start() { |
| 381 | env.resumed = evalCond(flow["resumedIf"].isNull ? .bool(false) : flow["resumedIf"]) |
| 382 | // Strong self: the initial walk must survive even before the owner |
| 383 | // stores the engine (asks/chips re-anchor through the owner after). |
| 384 | if env.resumed, |
| 385 | !(flow["resumeUnless"] != .null && evalCond(flow["resumeUnless"])), |
| 386 | let line = flow["resumeSay"].stringValue { |
| 387 | Task { |
| 388 | var extra = FlowSayExtra() |
| 389 | extra.local = true |
| 390 | await self.io.say(line, chips: nil, extra: extra) |
| 391 | await self.enter(self.flow["entry"].stringValue ?? "") |
| 392 | } |
| 393 | } else { |
| 394 | Task { |
| 395 | await self.enter(self.flow["entry"].stringValue ?? "") |
| 396 | } |
| 397 | } |
| 398 | } |
| 399 | |
| 400 | // Actions shared by chips, `on` branches, and entries. True = we moved. |
| 401 | @discardableResult |
| 402 | func runActions(_ a: FlowJSON, stepId: String) async -> Bool { |
| 403 | if a.isNull { return false } |
| 404 | if !a["set"].isNull { setPaths(a["set"]) } |
| 405 | if !a["record"].isNull { |
| 406 | let rec = a["record"] |
| 407 | let step = rec["step"].stringValue ?? stepId |
| 408 | let value = rec["value"].isNull ? "" : valueOf(rec["value"]).display |
| 409 | await io.record(step: step, label: renderText(rec["label"]), value: value) |
| 410 | } |
| 411 | if let ack = a["ack"].stringValue { env.ack = renderText(.string(ack)) } |
| 412 | if let sayText = a["say"].stringValue { |
| 413 | var extra = FlowSayExtra() |
| 414 | extra.local = a["local"].truthy |
| 415 | await io.say(renderText(.string(sayText)), chips: nil, extra: extra) |
| 416 | } |
| 417 | if !a["ask"].isNull { |
| 418 | let text = a["ask"].stringValue ?? a["ask"]["text"].stringValue ?? "" |
| 419 | await askIn(stepId: stepId, text: renderText(.string(text))) |
| 420 | return true |
| 421 | } |
| 422 | if !a["gotoAsk"].isNull { |
| 423 | let target = a["gotoAsk"]["step"].stringValue ?? stepId |
| 424 | await askIn(stepId: target, text: renderText(.string(a["gotoAsk"]["text"].stringValue ?? ""))) |
| 425 | return true |
| 426 | } |
| 427 | if a["retry"].stringValue == "step" || a["retry"].truthy { |
| 428 | await enter(stepId) |
| 429 | return true |
| 430 | } |
| 431 | if let goto = a["goto"].stringValue { |
| 432 | await enter(goto) |
| 433 | return true |
| 434 | } |
| 435 | return false |
| 436 | } |
| 437 | |
| 438 | func runEffect(stepId: String, effect: FlowJSON, argsOverride: [FlowJSON]? = nil) async { |
| 439 | guard let step = steps[stepId]?.step else { return } |
| 440 | let args = argsOverride ?? effect["args"].arrayValue.map { valueOf($0) } |
| 441 | let r = await io.verb(effect["verb"].stringValue ?? "", args: args) |
| 442 | let branch = step["on"][Self.resultKey(r)] |
| 443 | if branch.isNull { return } // fire-and-forget verb |
| 444 | let moved = await runActions(branch, stepId: stepId) |
| 445 | if !moved { armInput(stepId: stepId) } // rejected input re-asks in place |
| 446 | } |
| 447 | |
| 448 | func buildChips(stepId: String, go: OnceStep) -> [FlowChip]? { |
| 449 | guard let step = steps[stepId]?.step else { return nil } |
| 450 | let chips = step["chips"].arrayValue.filter { evalCond($0["if"]) }.map { c -> FlowChip in |
| 451 | let advancing = !(c["advancing"] == .bool(false)) |
| 452 | let hasProbe = !c["probe"].isNull |
| 453 | return FlowChip( |
| 454 | label: renderText(c["label"]), |
| 455 | spentLabel: c["spent"].stringValue, |
| 456 | trailing: c["trailing"].truthy, |
| 457 | isStale: (!advancing && !hasProbe) ? { false } : { go.taken }, |
| 458 | run: { [weak self] in |
| 459 | guard let self else { return } |
| 460 | let act: () -> Void = { |
| 461 | Task { @MainActor in |
| 462 | if c["cancelInput"].truthy { self.io.cancelAnswer() } |
| 463 | if !c["set"].isNull { self.setPaths(c["set"]) } |
| 464 | if !c["effect"].isNull { |
| 465 | _ = await self.io.verb(c["effect"]["verb"].stringValue ?? "", |
| 466 | args: c["effect"]["args"].arrayValue.map { self.valueOf($0) }) |
| 467 | } |
| 468 | await self.runActions(c, stepId: stepId) |
| 469 | } |
| 470 | } |
| 471 | if !advancing { |
| 472 | act() |
| 473 | if hasProbe { |
| 474 | let after = c["probe"]["afterMs"].isNull ? 1500 : c["probe"]["afterMs"].numberValue |
| 475 | self.io.delay(ms: after) { [weak self] in |
| 476 | guard let self else { return } |
| 477 | if !self.evalCond(c["probe"]["unless"]) { |
| 478 | go { Task { await self.enter(c["probe"]["goto"].stringValue ?? stepId) } } |
| 479 | } |
| 480 | } |
| 481 | } |
| 482 | } else { |
| 483 | go(act) |
| 484 | } |
| 485 | }) |
| 486 | } |
| 487 | return chips.isEmpty ? nil : chips |
| 488 | } |
| 489 | |
| 490 | func armInput(stepId: String) { |
| 491 | guard let step = steps[stepId]?.step, !step["input"].isNull else { return } |
| 492 | let input = step["input"] |
| 493 | let go = currentGo |
| 494 | if input["kind"].stringValue == "text" { |
| 495 | io.ask { [weak self] answer in |
| 496 | guard let self else { return } |
| 497 | go { |
| 498 | Task { @MainActor in |
| 499 | var text = answer.text.trimmingCharacters(in: .whitespacesAndNewlines) |
| 500 | // Clean BEFORE the cap so a chatty preamble can't eat |
| 501 | // into it ("my name is " + 25 chars keeps the name). |
| 502 | if input["clean"].stringValue == "name" { text = cleanNameAnswer(text) } |
| 503 | if case .number(let maxLen) = input["maxLen"] { text = String(text.prefix(Int(maxLen))) } |
| 504 | self.env.vars["answer"] = .string(text) |
| 505 | if input["required"].truthy && text.isEmpty { |
| 506 | await self.enter(stepId) |
| 507 | return |
| 508 | } |
| 509 | if !step["effect"].isNull { |
| 510 | await self.runEffect(stepId: stepId, effect: step["effect"]) |
| 511 | } |
| 512 | } |
| 513 | } |
| 514 | } |
| 515 | } else if input["kind"].stringValue == "photo" { |
| 516 | armPhoto(stepId: stepId, step: step, go: go) |
| 517 | } |
| 518 | } |
| 519 | |
| 520 | private func armPhoto(stepId: String, step: FlowJSON, go: OnceStep) { |
| 521 | io.ask { [weak self] answer in |
| 522 | guard let self else { return } |
| 523 | guard let img = answer.imageAttachment else { |
| 524 | Task { @MainActor in |
| 525 | var extra = FlowSayExtra() |
| 526 | extra.local = step["input"]["reject"]["local"].truthy |
| 527 | await self.io.say(self.renderText(step["input"]["reject"]["text"]), chips: nil, extra: extra) |
| 528 | self.armPhoto(stepId: stepId, step: step, go: go) |
| 529 | } |
| 530 | return |
| 531 | } |
| 532 | go { |
| 533 | Task { @MainActor in |
| 534 | let text = answer.text.trimmingCharacters(in: .whitespacesAndNewlines) |
| 535 | self.env.vars["answerText"] = .string(text) |
| 536 | await self.runEffect(stepId: stepId, effect: step["effect"], |
| 537 | argsOverride: [.object(img.mapValues { .string($0) }), .string(text)]) |
| 538 | } |
| 539 | } |
| 540 | } |
| 541 | } |
| 542 | |
| 543 | public func enter(_ id: String) async { |
| 544 | guard let ctx = steps[id] else { return } |
| 545 | let step = ctx.step |
| 546 | env.currentStepDone = { [weak self] in self?.io.done(id) ?? false } |
| 547 | |
| 548 | // Entry branches: state that satisfies the step on arrival. |
| 549 | for e in step["entries"].arrayValue { |
| 550 | guard evalCond(e["if"]) else { continue } |
| 551 | if !e["set"].isNull { setPaths(e["set"]) } |
| 552 | if !io.done(id) { |
| 553 | if !e["recordIfNew"].isNull { |
| 554 | await io.record(step: id, label: renderText(e["recordIfNew"]["label"]), |
| 555 | value: e["recordIfNew"]["value"].stringValue ?? "") |
| 556 | } |
| 557 | if let line = e["sayIfNew"].stringValue { |
| 558 | await io.say(renderText(.string(line)), chips: nil, extra: FlowSayExtra()) |
| 559 | } |
| 560 | } |
| 561 | await enter(e["goto"].stringValue ?? ctx.next ?? "") |
| 562 | return |
| 563 | } |
| 564 | if step["skipIf"].arrayValue.contains(where: { evalCond($0) }) { |
| 565 | await enter(step["skipTo"].stringValue ?? ctx.next ?? "") |
| 566 | return |
| 567 | } |
| 568 | |
| 569 | // A step may persist itself on arrival (finish's completion marker). |
| 570 | if !step["record"].isNull, !io.done(id) { |
| 571 | await io.record(step: id, label: renderText(step["record"]["label"]), |
| 572 | value: step["record"]["value"].stringValue ?? "") |
| 573 | } |
| 574 | |
| 575 | let go = OnceStep() |
| 576 | currentGo = go |
| 577 | |
| 578 | if !step["effects"].isNull { |
| 579 | for eff in step["effects"].arrayValue where evalCond(eff["if"]) { |
| 580 | _ = await io.verb(eff["verb"].stringValue ?? "", args: eff["args"].arrayValue.map { valueOf($0) }) |
| 581 | } |
| 582 | } |
| 583 | |
| 584 | let bubbles = step["bubbles"].arrayValue.filter { evalCond($0["if"]) } |
| 585 | for (i, b) in bubbles.enumerated() { |
| 586 | let last = i == bubbles.count - 1 |
| 587 | var extra = FlowSayExtra() |
| 588 | if let key = b["key"].stringValue { extra.key = template(key) } |
| 589 | extra.hint = b["hint"].stringValue |
| 590 | extra.attachHint = b["attachHint"].stringValue |
| 591 | extra.label = b["label"].stringValue |
| 592 | extra.local = b["local"].truthy |
| 593 | if let img = b["img"].stringValue { |
| 594 | extra.imgToken = img |
| 595 | extra.imgAlt = renderText(b["imgAlt"]) |
| 596 | extra.imgRound = b["imgRound"].truthy |
| 597 | } |
| 598 | await io.say(renderText(b["text"]), chips: last ? buildChips(stepId: id, go: go) : nil, extra: extra) |
| 599 | } |
| 600 | if bubbles.isEmpty, !step["chips"].isNull { |
| 601 | await io.say("", chips: buildChips(stepId: id, go: go), extra: FlowSayExtra()) |
| 602 | } |
| 603 | armInput(stepId: id) |
| 604 | |
| 605 | // Settle: wait for a condition to become true on its own, then re-enter. |
| 606 | if !step["settle"].isNull, !evalCond(step["settle"]["when"]) { |
| 607 | let period = step["settle"]["everyMs"].isNull ? 700 : step["settle"]["everyMs"].numberValue |
| 608 | func tick() { |
| 609 | if go.taken { return } |
| 610 | if evalCond(step["settle"]["when"]) { |
| 611 | go { Task { await self.enter(step["settle"]["goto"].stringValue ?? id) } } |
| 612 | return |
| 613 | } |
| 614 | io.delay(ms: period, tick) |
| 615 | } |
| 616 | io.delay(ms: period, tick) |
| 617 | } |
| 618 | |
| 619 | if let auto = step["auto"].stringValue { |
| 620 | await enter(auto) |
| 621 | return |
| 622 | } |
| 623 | if step["end"].truthy { env.onEnd() } |
| 624 | } |
| 625 | |
| 626 | // A retry that re-asks with new text: one fresh line carrying the step's |
| 627 | // chips + hint, then the input re-arms. |
| 628 | func askIn(stepId: String, text: String) async { |
| 629 | guard let step = steps[stepId]?.step else { return } |
| 630 | let go = OnceStep() |
| 631 | currentGo = go |
| 632 | var extra = FlowSayExtra() |
| 633 | if let src = step["bubbles"].arrayValue.last { |
| 634 | extra.hint = src["hint"].stringValue |
| 635 | extra.attachHint = src["attachHint"].stringValue |
| 636 | extra.label = src["label"].stringValue |
| 637 | } |
| 638 | await io.say(text, chips: buildChips(stepId: stepId, go: go), extra: extra) |
| 639 | armInput(stepId: stepId) |
| 640 | } |
| 641 | } |
| 642 | |
| 643 | private extension FlowJSON { |
| 644 | var numberValue: Double { |
| 645 | if case .number(let n) = self { return n } |
| 646 | return 0 |
| 647 | } |
| 648 | /// Ordered key/value pairs of an object (order not semantic for `set`). |
| 649 | var arrayPairs: [(String, FlowJSON)] { |
| 650 | if case .object(let o) = self { return o.map { ($0.key, $0.value) } } |
| 651 | return [] |
| 652 | } |
| 653 | } |
| 654 | |
amadan