runtime/Debugger.js · elk · git.iko.soy

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elk/runtime/Debugger.js

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1(function() {

2'use strict';

4if (!window.location.origin) {

5 window.location.origin =

6 window.location.protocol + "//" +

7 window.location.hostname +

8 (window.location.port ? (':' + window.location.port) : '');

9}

11Elm.Debugger = null;

12Elm.debuggerAttach = function(module, hotSwapState /* =undefined */) {

13 return {

14 make: function(runtime) {

15 var wrappedModule = debugModule(module, runtime);

16 Elm.Debugger = debuggerInit(wrappedModule, runtime, hotSwapState);

17 dispatchElmDebuggerInit();

18 return wrappedModule.debuggedModule;

19 }

20 };

21};

23var EVENTS_PER_SAVE = 100;

25function dispatchElmDebuggerInit() {

26 if (parent.window) {

27 var dispatch = function() {

28 parent.window.postMessage("elmDebuggerInit", window.location.origin);

29 };

30 if (parent.window.document.readyState === "complete") {

31 dispatch();

32 }

33 else {

34 parent.window.addEventListener("load", dispatch);

35 }

36 }

39function debugModule(module, runtime) {

40 var programPaused = false;

41 var recordedEvents = [];

42 var asyncCallbacks = [];

43 var snapshots = [];

44 var watchTracker = Elm.Native.Debug.make(runtime).watchTracker;

45 var pauseTime = 0;

46 var eventsUntilSnapshot = EVENTS_PER_SAVE;

47 runtime.eventCounter = runtime.eventCounter || 0;

49 // runtime is the prototype of wrappedRuntime

50 // so we can access all runtime properties too

51 var wrappedRuntime = Object.create(runtime);

52 wrappedRuntime.notify = wrapNotify;

53 wrappedRuntime.runDelayed = wrapRunDelayed;

55 // make a copy of the wrappedRuntime

56 var assignedPropTracker = Object.create(wrappedRuntime);

57 var debuggedModule = module.make(assignedPropTracker);

59 // make sure the signal graph is actually a signal & extract the visual model

60 if ( !('recv' in debuggedModule.main) ) {

61 debuggedModule.main = Elm.Signal.make(runtime).constant(debuggedModule.main);

62 }

64 // The main module stores imported modules onto the runtime.

65 // To ensure only one instance of each module is created,

66 // we assign them back on the original runtime object.

67 Object.keys(assignedPropTracker).forEach(function(key) {

68 runtime[key] = assignedPropTracker[key];

69 });

71 var signalGraphNodes = flattenSignalGraph(wrappedRuntime.inputs);

72 var tracePath = tracePathInit(runtime, debuggedModule.main);

74 snapshots.push(snapshotSignalGraph(signalGraphNodes));

76 function wrapNotify(id, v) {

77 var timestep = runtime.timer.now();

79 if (programPaused) {

80 // ignore async events generated while playing back

81 // or user events while program is paused

82 return false;

83 }

84 else {

85 recordEvent(id, v, timestep);

86 var changed = runtime.notify(id, v, timestep);

87 snapshotOnCheckpoint();

88 if (parent.window) {

89 parent.window.postMessage("elmNotify", window.location.origin);

90 }

91 return changed;

92 }

93 };

95 function wrapRunDelayed(func, delayMs) {

96 if (programPaused) {

97 // Don't push timers and such to the callback stack while we're paused.

98 // It causes too many callbacks to be fired during unpausing.

99 return 0;

100 }

101 var cbObj = { func:func, delayMs:delayMs, timerId:0, executed:false };

102 var timerId = setTimeout(function() {

103 cbObj.executed = true;

104 func();

105 }, delayMs);

106 cbObj.timerId = timerId;

107 asyncCallbacks.push(cbObj);

108 return timerId;

109 }

111 function recordEvent(id, v, timestep) {

112 watchTracker.pushFrame();

113 recordedEvents.push({ id:id, value:v, timestep:timestep });

114 runtime.eventCounter += 1;

115 }

117 function clearAsyncCallbacks() {

118 asyncCallbacks.forEach(function(timer) {

119 if (!timer.executed) {

120 clearTimeout(timer.timerId);

121 }

122 });

123 }

125 function clearRecordedEvents() {

126 recordedEvents = [];

127 runtime.eventCounter = 0;

128 }

130 function getRecordedEventsLength() {

131 return recordedEvents.length;

132 }

134 function getRecordedEventAt(i) {

135 return recordedEvents[i];

136 }

138 function copyRecordedEvents() {

139 return recordedEvents.slice();

140 }

142 function loadRecordedEvents(events) {

143 recordedEvents = events.slice();

144 }

146 function clearSnapshots() {

147 snapshots = [snapshotSignalGraph(signalGraphNodes)];

148 }

150 function getSnapshotAt(i) {

151 var snapshotEvent = Math.floor(i / EVENTS_PER_SAVE);

152 assert(snapshotEvent < snapshots.length && snapshotEvent >= 0,

153 "Out of bounds index: " + snapshotEvent);

154 return snapshots[snapshotEvent];

155 }

157 function snapshotOnCheckpoint() {

158 if (eventsUntilSnapshot === 1) {

159 snapshots.push(snapshotSignalGraph(signalGraphNodes));

160 eventsUntilSnapshot = EVENTS_PER_SAVE;

161 } else {

162 eventsUntilSnapshot -= 1;

163 }

164 }

166 function setPaused() {

167 programPaused = true;

168 clearAsyncCallbacks();

169 tracePath.stopRecording();

170 pauseTime = Date.now();

171 }

173 function setContinue(position) {

174 var timerDelay = Date.now() - pauseTime;

175 runtime.timer.addDelay(timerDelay);

176 programPaused = false;

177 if (position > 0) {

178 // If we're not unpausing at the head, then we need to dump the

179 // events that are ahead of where we're continuing.

180 var lastSnapshotPosition = Math.floor(position / EVENTS_PER_SAVE);

181 eventsUntilSnapshot = EVENTS_PER_SAVE - (position % EVENTS_PER_SAVE);

182 snapshots = snapshots.slice(0, lastSnapshotPosition + 1);

183 recordedEvents = recordedEvents.slice(0, position);

184 tracePath.clearTracesAfter(position);

185 runtime.eventCounter = position;

186 executeCallbacks(asyncCallbacks, false);

187 }

188 tracePath.startRecording();

189 }

191 function getPaused() {

192 return programPaused;

193 }

195 return {

196 debuggedModule: debuggedModule,

197 signalGraphNodes: signalGraphNodes,

198 initialSnapshot: snapshotSignalGraph(signalGraphNodes),

199 initialAsyncCallbacks: asyncCallbacks.slice(),

200 // API functions

201 clearAsyncCallbacks: clearAsyncCallbacks,

202 clearRecordedEvents: clearRecordedEvents,

203 getRecordedEventsLength: getRecordedEventsLength,

204 getRecordedEventAt: getRecordedEventAt,

205 copyRecordedEvents: copyRecordedEvents,

206 loadRecordedEvents: loadRecordedEvents,

207 clearSnapshots: clearSnapshots,

208 getSnapshotAt: getSnapshotAt,

209 snapshotOnCheckpoint: snapshotOnCheckpoint,

210 getPaused: getPaused,

211 setPaused: setPaused,

212 setContinue: setContinue,

213 tracePath: tracePath,

214 watchTracker: watchTracker

215 };

218function debuggerInit(debugModule, runtime, hotSwapState /* =undefined */) {

219 var currentEventIndex = 0;

221 function resetProgram(position) {

222 var closestSnapshot = debugModule.getSnapshotAt(position);

223 debugModule.clearAsyncCallbacks();

224 restoreSnapshot(debugModule.signalGraphNodes, closestSnapshot);

225 redrawGraphics();

226 }

228 function restartProgram() {

229 pauseProgram();

230 resetProgram(0);

231 debugModule.watchTracker.clear();

232 debugModule.tracePath.clearTraces();

233 debugModule.clearRecordedEvents();

234 debugModule.clearSnapshots();

235 debugModule.setContinue(0);

236 executeCallbacks(debugModule.initialAsyncCallbacks, true);

237 }

239 function pauseProgram() {

240 debugModule.setPaused();

241 currentEventIndex = debugModule.getRecordedEventsLength();

242 }

244 function continueProgram() {

245 if (debugModule.getPaused())

246 {

247 if (currentEventIndex === 0) {

248 restartProgram();

249 return;

250 }

251 var closestSnapshotIndex =

252 Math.floor(currentEventIndex / EVENTS_PER_SAVE) * EVENTS_PER_SAVE;

253 resetProgram(currentEventIndex);

254 var continueIndex = currentEventIndex;

255 currentEventIndex = closestSnapshotIndex;

256 stepTo(continueIndex);

257 debugModule.setContinue(currentEventIndex);

258 }

259 }

261 function stepTo(index) {

262 if (!debugModule.getPaused()) {

263 debugModule.setPaused();

264 resetProgram();

265 }

267 if (index < 0 || index > getMaxSteps()) {

268 throw "Index out of bounds: " + index;

269 }

271 if (index < currentEventIndex) {

272 var closestSnapshotIndex = Math.floor(index / EVENTS_PER_SAVE) * EVENTS_PER_SAVE;

273 resetProgram(index);

274 currentEventIndex = closestSnapshotIndex;

275 }

277 while (currentEventIndex < index) {

278 var nextEvent = debugModule.getRecordedEventAt(currentEventIndex);

279 runtime.notify(nextEvent.id, nextEvent.value, nextEvent.timestep);

281 currentEventIndex += 1;

282 }

283 }

285 function getMaxSteps() {

286 return debugModule.getRecordedEventsLength();

287 }

289 function redrawGraphics() {

290 var main = debugModule.debuggedModule.main

291 for (var i = main.kids.length ; i-- ; ) {

292 main.kids[i].recv(runtime.timer.now(), true, main.id);

293 }

294 }

296 function getHotSwapState() {

297 var continueIndex = currentEventIndex;

298 if (!debugModule.getPaused()) {

299 continueIndex = getMaxSteps();

300 }

301 return {

302 recordedEvents: debugModule.copyRecordedEvents(),

303 currentEventIndex: continueIndex

304 };

305 }

307 function dispose() {

308 var parentNode = runtime.node.parentNode;

309 parentNode.removeChild(debugModule.tracePath.canvas);

310 parentNode.removeChild(runtime.node);

311 }

313 if (hotSwapState) {

314 // The problem is that we want to previous paused state. But

315 // by the time JS reaches here, the old code has been swapped out

316 // and the new modules are being generated. So we can ask the

317 // debugging console what it thinks the pause state is and go

318 // from there.

319 var paused = top.debug.paused;

320 debugModule.setPaused();

321 debugModule.loadRecordedEvents(hotSwapState.recordedEvents);

322 var index = getMaxSteps();

323 runtime.eventCounter = 0;

324 debugModule.tracePath.clearTraces();

326 // draw new trace path

327 debugModule.tracePath.startRecording();

328 while(currentEventIndex < index) {

329 var nextEvent = debugModule.getRecordedEventAt(currentEventIndex);

330 runtime.eventCounter += 1;

331 runtime.notify(nextEvent.id, nextEvent.value, nextEvent.timestep);

332 debugModule.snapshotOnCheckpoint();

333 currentEventIndex += 1;

334 }

335 debugModule.tracePath.stopRecording();

337 stepTo(hotSwapState.currentEventIndex);

338 if (!paused) {

339 debugModule.setContinue(hotSwapState.currentEventIndex);

340 }

341 }

343 runtime.node.parentNode.appendChild(debugModule.tracePath.canvas);

345 var elmDebugger = {

346 restart: restartProgram,

347 pause: pauseProgram,

348 kontinue: continueProgram,

349 getMaxSteps: getMaxSteps,

350 stepTo: stepTo,

351 getPaused: debugModule.getPaused,

352 getHotSwapState: getHotSwapState,

353 dispose: dispose,

354 allNodes: debugModule.signalGraphNodes,

355 watchTracker: debugModule.watchTracker

356 };

358 return elmDebugger;

361function Point(x, y) {

362 this.x = x;

363 this.y = y;

365 this.translate = function(x, y) {

366 return new Point(this.x + x, this.y + y);

367 }

369 this.equals = function(p) {

370 return this.x == p.x && this.y == p.y;

371 }

374function tracePathInit(runtime, signalGraphMain) {

375 var List = Elm.List.make(runtime);

376 var Signal = Elm.Signal.make(runtime);

377 var tracePathNode = A2(Signal.lift, graphicsUpdate, signalGraphMain);

378 var tracePathCanvas = createCanvas();

379 var tracePositions = {};

380 var recordingTraces = true;

382 function findPositions(currentScene) {

383 var positions = {};

384 function processElement(elem, offset) {

385 if (elem.element.ctor == "Custom" && elem.element.type == "Collage")

386 {

387 List.map(F2(processForm)(offset))(elem.element.model.forms);

388 }

389 if (elem.props.debugTracePathId)

390 {

391 positions[elem.props.debugTracePathId] = new Point(offset.x, offset.y);

392 }

393 }

395 function processForm(offset, form) {

396 if (form.form.ctor == "FElement")

397 {

398 processElement(form.form._0, offset.translate(form.x, -form.y));

399 }

400 }

402 processElement(currentScene, new Point(0, 0));

403 return positions;

404 }

406 function appendPositions(positions) {

407 for (var id in positions) {

408 var pos = positions[id];

409 if (tracePositions.hasOwnProperty(id)) {

410 tracePositions[id].push(pos);

411 }

412 else {

413 tracePositions[id] = [pos];

414 }

415 if (tracePositions[id].length < runtime.eventCounter) {

416 var padCount = runtime.eventCounter - tracePositions[id].length;

417 var lastTracePosition = tracePositions[id][tracePositions[id].length - 1];

418 for (var i = padCount; i--;) {

419 tracePositions[id].push(lastTracePosition)

420 }

421 }

422 assert(tracePositions[id].length === runtime.eventCounter,

423 "We don't have a 1-1 mapping of trace positions to events");

424 }

425 }

427 function graphicsUpdate(currentScene) {

428 if (!recordingTraces) {

429 return;

430 }

432 var ctx = tracePathCanvas.getContext('2d');

433 ctx.clearRect(0, 0, tracePathCanvas.width, tracePathCanvas.height);

435 ctx.save();

436 ctx.translate(ctx.canvas.width/2, ctx.canvas.height/2);

437 appendPositions(findPositions(currentScene));

438 for (var id in tracePositions)

439 {

440 ctx.beginPath();

441 var points = tracePositions[id];

442 for (var i=0; i < points.length; i++)

443 {

444 var p = points[i];

445 if (i == 0) {

446 ctx.moveTo(p.x, p.y);

447 }

448 else {

449 ctx.lineTo(p.x, p.y);

450 }

451 }

452 ctx.lineWidth = 1;

453 ctx.strokeStyle = "rgba(50, 50, 50, 0.4)";

454 ctx.stroke();

455 }

457 ctx.restore();

458 }

460 function clearTraces() {

461 tracePositions = {};

462 }

464 function stopRecording() {

465 recordingTraces = false;

466 }

468 function startRecording() {

469 recordingTraces = true;

470 }

472 function clearTracesAfter(position) {

473 var newTraces = {};

474 for (var id in tracePositions) {

475 newTraces[id] = tracePositions[id].slice(0,position);

476 }

477 tracePositions = newTraces;

478 }

480 return {

481 graphicsUpdate: graphicsUpdate,

482 canvas: tracePathCanvas,

483 clearTraces: clearTraces,

484 clearTracesAfter: clearTracesAfter,

485 stopRecording: stopRecording,

486 startRecording: startRecording

487 }

490function executeCallbacks(callbacks, reexecute) {

491 callbacks.forEach(function(timer) {

492 if (reexecute || !timer.executed) {

493 var func = timer.func;

494 timer.executed = true;

495 func();

496 }

497 });

500function createCanvas() {

501 var c = document.createElement('canvas');

502 c.width = window.innerWidth;

503 c.height = window.innerHeight;

504 c.style.position = "absolute";

505 c.style.top = "0";

506 c.style.left = "0";

507 c.style.pointerEvents = "none";

508 return c;

511function assert(bool, msg) {

512 if (!bool) {

513 throw "Assertion error: " + msg;

514 }

517function snapshotSignalGraph(signalGraphNodes) {

518 var nodeValues = [];

520 signalGraphNodes.forEach(function(node) {

521 nodeValues.push({ value: node.value, id: node.id });

522 });

524 return nodeValues;

527function restoreSnapshot(signalGraphNodes, snapshot) {

528 assert(signalGraphNodes.length == snapshot.length,

529 "saved program state has wrong length");

530 for (var i=0; i < signalGraphNodes.length; i++) {

531 var node = signalGraphNodes[i];

532 var state = snapshot[i];

533 assert(node.id == state.id, "the nodes moved position");

535 node.value = state.value;

536 }

539function flattenSignalGraph(nodes) {

540 var nodesById = {};

542 function addAllToDict(node) {

543 nodesById[node.id] = node;

544 node.kids.forEach(addAllToDict);

545 }

546 nodes.forEach(addAllToDict);

548 var allNodes = Object.keys(nodesById).sort().map(function(key) {

549 return nodesById[key];

550 });

551 return allNodes;

554}());