| /** |
| * Copyright (c) 2014-present, Facebook, Inc. |
| * |
| * This source code is licensed under the MIT license found in the |
| * LICENSE file in the root directory of this source tree. |
| */ |
| |
| !(function(global) { |
| "use strict"; |
| |
| var Op = Object.prototype; |
| var hasOwn = Op.hasOwnProperty; |
| var undefined; // More compressible than void 0. |
| var $Symbol = typeof Symbol === "function" ? Symbol : {}; |
| var iteratorSymbol = $Symbol.iterator || "@@iterator"; |
| var asyncIteratorSymbol = $Symbol.asyncIterator || "@@asyncIterator"; |
| var toStringTagSymbol = $Symbol.toStringTag || "@@toStringTag"; |
| |
| var inModule = typeof module === "object"; |
| var runtime = global.regeneratorRuntime; |
| if (runtime) { |
| if (inModule) { |
| // If regeneratorRuntime is defined globally and we're in a module, |
| // make the exports object identical to regeneratorRuntime. |
| module.exports = runtime; |
| } |
| // Don't bother evaluating the rest of this file if the runtime was |
| // already defined globally. |
| return; |
| } |
| |
| // Define the runtime globally (as expected by generated code) as either |
| // module.exports (if we're in a module) or a new, empty object. |
| runtime = global.regeneratorRuntime = inModule ? module.exports : {}; |
| |
| function wrap(innerFn, outerFn, self, tryLocsList) { |
| // If outerFn provided and outerFn.prototype is a Generator, then outerFn.prototype instanceof Generator. |
| var protoGenerator = outerFn && outerFn.prototype instanceof Generator ? outerFn : Generator; |
| var generator = Object.create(protoGenerator.prototype); |
| var context = new Context(tryLocsList || []); |
| |
| // The ._invoke method unifies the implementations of the .next, |
| // .throw, and .return methods. |
| generator._invoke = makeInvokeMethod(innerFn, self, context); |
| |
| return generator; |
| } |
| runtime.wrap = wrap; |
| |
| // Try/catch helper to minimize deoptimizations. Returns a completion |
| // record like context.tryEntries[i].completion. This interface could |
| // have been (and was previously) designed to take a closure to be |
| // invoked without arguments, but in all the cases we care about we |
| // already have an existing method we want to call, so there's no need |
| // to create a new function object. We can even get away with assuming |
| // the method takes exactly one argument, since that happens to be true |
| // in every case, so we don't have to touch the arguments object. The |
| // only additional allocation required is the completion record, which |
| // has a stable shape and so hopefully should be cheap to allocate. |
| function tryCatch(fn, obj, arg) { |
| try { |
| return { type: "normal", arg: fn.call(obj, arg) }; |
| } catch (err) { |
| return { type: "throw", arg: err }; |
| } |
| } |
| |
| var GenStateSuspendedStart = "suspendedStart"; |
| var GenStateSuspendedYield = "suspendedYield"; |
| var GenStateExecuting = "executing"; |
| var GenStateCompleted = "completed"; |
| |
| // Returning this object from the innerFn has the same effect as |
| // breaking out of the dispatch switch statement. |
| var ContinueSentinel = {}; |
| |
| // Dummy constructor functions that we use as the .constructor and |
| // .constructor.prototype properties for functions that return Generator |
| // objects. For full spec compliance, you may wish to configure your |
| // minifier not to mangle the names of these two functions. |
| function Generator() {} |
| function GeneratorFunction() {} |
| function GeneratorFunctionPrototype() {} |
| |
| // This is a polyfill for %IteratorPrototype% for environments that |
| // don't natively support it. |
| var IteratorPrototype = {}; |
| IteratorPrototype[iteratorSymbol] = function () { |
| return this; |
| }; |
| |
| var getProto = Object.getPrototypeOf; |
| var NativeIteratorPrototype = getProto && getProto(getProto(values([]))); |
| if (NativeIteratorPrototype && |
| NativeIteratorPrototype !== Op && |
| hasOwn.call(NativeIteratorPrototype, iteratorSymbol)) { |
| // This environment has a native %IteratorPrototype%; use it instead |
| // of the polyfill. |
| IteratorPrototype = NativeIteratorPrototype; |
| } |
| |
| var Gp = GeneratorFunctionPrototype.prototype = |
| Generator.prototype = Object.create(IteratorPrototype); |
| GeneratorFunction.prototype = Gp.constructor = GeneratorFunctionPrototype; |
| GeneratorFunctionPrototype.constructor = GeneratorFunction; |
| GeneratorFunctionPrototype[toStringTagSymbol] = |
| GeneratorFunction.displayName = "GeneratorFunction"; |
| |
| // Helper for defining the .next, .throw, and .return methods of the |
| // Iterator interface in terms of a single ._invoke method. |
| function defineIteratorMethods(prototype) { |
| ["next", "throw", "return"].forEach(function(method) { |
| prototype[method] = function(arg) { |
| return this._invoke(method, arg); |
| }; |
| }); |
| } |
| |
| runtime.isGeneratorFunction = function(genFun) { |
| var ctor = typeof genFun === "function" && genFun.constructor; |
| return ctor |
| ? ctor === GeneratorFunction || |
| // For the native GeneratorFunction constructor, the best we can |
| // do is to check its .name property. |
| (ctor.displayName || ctor.name) === "GeneratorFunction" |
| : false; |
| }; |
| |
| runtime.mark = function(genFun) { |
| if (Object.setPrototypeOf) { |
| Object.setPrototypeOf(genFun, GeneratorFunctionPrototype); |
| } else { |
| genFun.__proto__ = GeneratorFunctionPrototype; |
| if (!(toStringTagSymbol in genFun)) { |
| genFun[toStringTagSymbol] = "GeneratorFunction"; |
| } |
| } |
| genFun.prototype = Object.create(Gp); |
| return genFun; |
| }; |
| |
| // Within the body of any async function, `await x` is transformed to |
| // `yield regeneratorRuntime.awrap(x)`, so that the runtime can test |
| // `hasOwn.call(value, "__await")` to determine if the yielded value is |
| // meant to be awaited. |
| runtime.awrap = function(arg) { |
| return { __await: arg }; |
| }; |
| |
| function AsyncIterator(generator) { |
| function invoke(method, arg, resolve, reject) { |
| var record = tryCatch(generator[method], generator, arg); |
| if (record.type === "throw") { |
| reject(record.arg); |
| } else { |
| var result = record.arg; |
| var value = result.value; |
| if (value && |
| typeof value === "object" && |
| hasOwn.call(value, "__await")) { |
| return Promise.resolve(value.__await).then(function(value) { |
| invoke("next", value, resolve, reject); |
| }, function(err) { |
| invoke("throw", err, resolve, reject); |
| }); |
| } |
| |
| return Promise.resolve(value).then(function(unwrapped) { |
| // When a yielded Promise is resolved, its final value becomes |
| // the .value of the Promise<{value,done}> result for the |
| // current iteration. If the Promise is rejected, however, the |
| // result for this iteration will be rejected with the same |
| // reason. Note that rejections of yielded Promises are not |
| // thrown back into the generator function, as is the case |
| // when an awaited Promise is rejected. This difference in |
| // behavior between yield and await is important, because it |
| // allows the consumer to decide what to do with the yielded |
| // rejection (swallow it and continue, manually .throw it back |
| // into the generator, abandon iteration, whatever). With |
| // await, by contrast, there is no opportunity to examine the |
| // rejection reason outside the generator function, so the |
| // only option is to throw it from the await expression, and |
| // let the generator function handle the exception. |
| result.value = unwrapped; |
| resolve(result); |
| }, reject); |
| } |
| } |
| |
| var previousPromise; |
| |
| function enqueue(method, arg) { |
| function callInvokeWithMethodAndArg() { |
| return new Promise(function(resolve, reject) { |
| invoke(method, arg, resolve, reject); |
| }); |
| } |
| |
| return previousPromise = |
| // If enqueue has been called before, then we want to wait until |
| // all previous Promises have been resolved before calling invoke, |
| // so that results are always delivered in the correct order. If |
| // enqueue has not been called before, then it is important to |
| // call invoke immediately, without waiting on a callback to fire, |
| // so that the async generator function has the opportunity to do |
| // any necessary setup in a predictable way. This predictability |
| // is why the Promise constructor synchronously invokes its |
| // executor callback, and why async functions synchronously |
| // execute code before the first await. Since we implement simple |
| // async functions in terms of async generators, it is especially |
| // important to get this right, even though it requires care. |
| previousPromise ? previousPromise.then( |
| callInvokeWithMethodAndArg, |
| // Avoid propagating failures to Promises returned by later |
| // invocations of the iterator. |
| callInvokeWithMethodAndArg |
| ) : callInvokeWithMethodAndArg(); |
| } |
| |
| // Define the unified helper method that is used to implement .next, |
| // .throw, and .return (see defineIteratorMethods). |
| this._invoke = enqueue; |
| } |
| |
| defineIteratorMethods(AsyncIterator.prototype); |
| AsyncIterator.prototype[asyncIteratorSymbol] = function () { |
| return this; |
| }; |
| runtime.AsyncIterator = AsyncIterator; |
| |
| // Note that simple async functions are implemented on top of |
| // AsyncIterator objects; they just return a Promise for the value of |
| // the final result produced by the iterator. |
| runtime.async = function(innerFn, outerFn, self, tryLocsList) { |
| var iter = new AsyncIterator( |
| wrap(innerFn, outerFn, self, tryLocsList) |
| ); |
| |
| return runtime.isGeneratorFunction(outerFn) |
| ? iter // If outerFn is a generator, return the full iterator. |
| : iter.next().then(function(result) { |
| return result.done ? result.value : iter.next(); |
| }); |
| }; |
| |
| function makeInvokeMethod(innerFn, self, context) { |
| var state = GenStateSuspendedStart; |
| |
| return function invoke(method, arg) { |
| if (state === GenStateExecuting) { |
| throw new Error("Generator is already running"); |
| } |
| |
| if (state === GenStateCompleted) { |
| if (method === "throw") { |
| throw arg; |
| } |
| |
| // Be forgiving, per 25.3.3.3.3 of the spec: |
| // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume |
| return doneResult(); |
| } |
| |
| context.method = method; |
| context.arg = arg; |
| |
| while (true) { |
| var delegate = context.delegate; |
| if (delegate) { |
| var delegateResult = maybeInvokeDelegate(delegate, context); |
| if (delegateResult) { |
| if (delegateResult === ContinueSentinel) continue; |
| return delegateResult; |
| } |
| } |
| |
| if (context.method === "next") { |
| // Setting context._sent for legacy support of Babel's |
| // function.sent implementation. |
| context.sent = context._sent = context.arg; |
| |
| } else if (context.method === "throw") { |
| if (state === GenStateSuspendedStart) { |
| state = GenStateCompleted; |
| throw context.arg; |
| } |
| |
| context.dispatchException(context.arg); |
| |
| } else if (context.method === "return") { |
| context.abrupt("return", context.arg); |
| } |
| |
| state = GenStateExecuting; |
| |
| var record = tryCatch(innerFn, self, context); |
| if (record.type === "normal") { |
| // If an exception is thrown from innerFn, we leave state === |
| // GenStateExecuting and loop back for another invocation. |
| state = context.done |
| ? GenStateCompleted |
| : GenStateSuspendedYield; |
| |
| if (record.arg === ContinueSentinel) { |
| continue; |
| } |
| |
| return { |
| value: record.arg, |
| done: context.done |
| }; |
| |
| } else if (record.type === "throw") { |
| state = GenStateCompleted; |
| // Dispatch the exception by looping back around to the |
| // context.dispatchException(context.arg) call above. |
| context.method = "throw"; |
| context.arg = record.arg; |
| } |
| } |
| }; |
| } |
| |
| // Call delegate.iterator[context.method](context.arg) and handle the |
| // result, either by returning a { value, done } result from the |
| // delegate iterator, or by modifying context.method and context.arg, |
| // setting context.delegate to null, and returning the ContinueSentinel. |
| function maybeInvokeDelegate(delegate, context) { |
| var method = delegate.iterator[context.method]; |
| if (method === undefined) { |
| // A .throw or .return when the delegate iterator has no .throw |
| // method always terminates the yield* loop. |
| context.delegate = null; |
| |
| if (context.method === "throw") { |
| if (delegate.iterator.return) { |
| // If the delegate iterator has a return method, give it a |
| // chance to clean up. |
| context.method = "return"; |
| context.arg = undefined; |
| maybeInvokeDelegate(delegate, context); |
| |
| if (context.method === "throw") { |
| // If maybeInvokeDelegate(context) changed context.method from |
| // "return" to "throw", let that override the TypeError below. |
| return ContinueSentinel; |
| } |
| } |
| |
| context.method = "throw"; |
| context.arg = new TypeError( |
| "The iterator does not provide a 'throw' method"); |
| } |
| |
| return ContinueSentinel; |
| } |
| |
| var record = tryCatch(method, delegate.iterator, context.arg); |
| |
| if (record.type === "throw") { |
| context.method = "throw"; |
| context.arg = record.arg; |
| context.delegate = null; |
| return ContinueSentinel; |
| } |
| |
| var info = record.arg; |
| |
| if (! info) { |
| context.method = "throw"; |
| context.arg = new TypeError("iterator result is not an object"); |
| context.delegate = null; |
| return ContinueSentinel; |
| } |
| |
| if (info.done) { |
| // Assign the result of the finished delegate to the temporary |
| // variable specified by delegate.resultName (see delegateYield). |
| context[delegate.resultName] = info.value; |
| |
| // Resume execution at the desired location (see delegateYield). |
| context.next = delegate.nextLoc; |
| |
| // If context.method was "throw" but the delegate handled the |
| // exception, let the outer generator proceed normally. If |
| // context.method was "next", forget context.arg since it has been |
| // "consumed" by the delegate iterator. If context.method was |
| // "return", allow the original .return call to continue in the |
| // outer generator. |
| if (context.method !== "return") { |
| context.method = "next"; |
| context.arg = undefined; |
| } |
| |
| } else { |
| // Re-yield the result returned by the delegate method. |
| return info; |
| } |
| |
| // The delegate iterator is finished, so forget it and continue with |
| // the outer generator. |
| context.delegate = null; |
| return ContinueSentinel; |
| } |
| |
| // Define Generator.prototype.{next,throw,return} in terms of the |
| // unified ._invoke helper method. |
| defineIteratorMethods(Gp); |
| |
| Gp[toStringTagSymbol] = "Generator"; |
| |
| // A Generator should always return itself as the iterator object when the |
| // @@iterator function is called on it. Some browsers' implementations of the |
| // iterator prototype chain incorrectly implement this, causing the Generator |
| // object to not be returned from this call. This ensures that doesn't happen. |
| // See https://github.com/facebook/regenerator/issues/274 for more details. |
| Gp[iteratorSymbol] = function() { |
| return this; |
| }; |
| |
| Gp.toString = function() { |
| return "[object Generator]"; |
| }; |
| |
| function pushTryEntry(locs) { |
| var entry = { tryLoc: locs[0] }; |
| |
| if (1 in locs) { |
| entry.catchLoc = locs[1]; |
| } |
| |
| if (2 in locs) { |
| entry.finallyLoc = locs[2]; |
| entry.afterLoc = locs[3]; |
| } |
| |
| this.tryEntries.push(entry); |
| } |
| |
| function resetTryEntry(entry) { |
| var record = entry.completion || {}; |
| record.type = "normal"; |
| delete record.arg; |
| entry.completion = record; |
| } |
| |
| function Context(tryLocsList) { |
| // The root entry object (effectively a try statement without a catch |
| // or a finally block) gives us a place to store values thrown from |
| // locations where there is no enclosing try statement. |
| this.tryEntries = [{ tryLoc: "root" }]; |
| tryLocsList.forEach(pushTryEntry, this); |
| this.reset(true); |
| } |
| |
| runtime.keys = function(object) { |
| var keys = []; |
| for (var key in object) { |
| keys.push(key); |
| } |
| keys.reverse(); |
| |
| // Rather than returning an object with a next method, we keep |
| // things simple and return the next function itself. |
| return function next() { |
| while (keys.length) { |
| var key = keys.pop(); |
| if (key in object) { |
| next.value = key; |
| next.done = false; |
| return next; |
| } |
| } |
| |
| // To avoid creating an additional object, we just hang the .value |
| // and .done properties off the next function object itself. This |
| // also ensures that the minifier will not anonymize the function. |
| next.done = true; |
| return next; |
| }; |
| }; |
| |
| function values(iterable) { |
| if (iterable) { |
| var iteratorMethod = iterable[iteratorSymbol]; |
| if (iteratorMethod) { |
| return iteratorMethod.call(iterable); |
| } |
| |
| if (typeof iterable.next === "function") { |
| return iterable; |
| } |
| |
| if (!isNaN(iterable.length)) { |
| var i = -1, next = function next() { |
| while (++i < iterable.length) { |
| if (hasOwn.call(iterable, i)) { |
| next.value = iterable[i]; |
| next.done = false; |
| return next; |
| } |
| } |
| |
| next.value = undefined; |
| next.done = true; |
| |
| return next; |
| }; |
| |
| return next.next = next; |
| } |
| } |
| |
| // Return an iterator with no values. |
| return { next: doneResult }; |
| } |
| runtime.values = values; |
| |
| function doneResult() { |
| return { value: undefined, done: true }; |
| } |
| |
| Context.prototype = { |
| constructor: Context, |
| |
| reset: function(skipTempReset) { |
| this.prev = 0; |
| this.next = 0; |
| // Resetting context._sent for legacy support of Babel's |
| // function.sent implementation. |
| this.sent = this._sent = undefined; |
| this.done = false; |
| this.delegate = null; |
| |
| this.method = "next"; |
| this.arg = undefined; |
| |
| this.tryEntries.forEach(resetTryEntry); |
| |
| if (!skipTempReset) { |
| for (var name in this) { |
| // Not sure about the optimal order of these conditions: |
| if (name.charAt(0) === "t" && |
| hasOwn.call(this, name) && |
| !isNaN(+name.slice(1))) { |
| this[name] = undefined; |
| } |
| } |
| } |
| }, |
| |
| stop: function() { |
| this.done = true; |
| |
| var rootEntry = this.tryEntries[0]; |
| var rootRecord = rootEntry.completion; |
| if (rootRecord.type === "throw") { |
| throw rootRecord.arg; |
| } |
| |
| return this.rval; |
| }, |
| |
| dispatchException: function(exception) { |
| if (this.done) { |
| throw exception; |
| } |
| |
| var context = this; |
| function handle(loc, caught) { |
| record.type = "throw"; |
| record.arg = exception; |
| context.next = loc; |
| |
| if (caught) { |
| // If the dispatched exception was caught by a catch block, |
| // then let that catch block handle the exception normally. |
| context.method = "next"; |
| context.arg = undefined; |
| } |
| |
| return !! caught; |
| } |
| |
| for (var i = this.tryEntries.length - 1; i >= 0; --i) { |
| var entry = this.tryEntries[i]; |
| var record = entry.completion; |
| |
| if (entry.tryLoc === "root") { |
| // Exception thrown outside of any try block that could handle |
| // it, so set the completion value of the entire function to |
| // throw the exception. |
| return handle("end"); |
| } |
| |
| if (entry.tryLoc <= this.prev) { |
| var hasCatch = hasOwn.call(entry, "catchLoc"); |
| var hasFinally = hasOwn.call(entry, "finallyLoc"); |
| |
| if (hasCatch && hasFinally) { |
| if (this.prev < entry.catchLoc) { |
| return handle(entry.catchLoc, true); |
| } else if (this.prev < entry.finallyLoc) { |
| return handle(entry.finallyLoc); |
| } |
| |
| } else if (hasCatch) { |
| if (this.prev < entry.catchLoc) { |
| return handle(entry.catchLoc, true); |
| } |
| |
| } else if (hasFinally) { |
| if (this.prev < entry.finallyLoc) { |
| return handle(entry.finallyLoc); |
| } |
| |
| } else { |
| throw new Error("try statement without catch or finally"); |
| } |
| } |
| } |
| }, |
| |
| abrupt: function(type, arg) { |
| for (var i = this.tryEntries.length - 1; i >= 0; --i) { |
| var entry = this.tryEntries[i]; |
| if (entry.tryLoc <= this.prev && |
| hasOwn.call(entry, "finallyLoc") && |
| this.prev < entry.finallyLoc) { |
| var finallyEntry = entry; |
| break; |
| } |
| } |
| |
| if (finallyEntry && |
| (type === "break" || |
| type === "continue") && |
| finallyEntry.tryLoc <= arg && |
| arg <= finallyEntry.finallyLoc) { |
| // Ignore the finally entry if control is not jumping to a |
| // location outside the try/catch block. |
| finallyEntry = null; |
| } |
| |
| var record = finallyEntry ? finallyEntry.completion : {}; |
| record.type = type; |
| record.arg = arg; |
| |
| if (finallyEntry) { |
| this.method = "next"; |
| this.next = finallyEntry.finallyLoc; |
| return ContinueSentinel; |
| } |
| |
| return this.complete(record); |
| }, |
| |
| complete: function(record, afterLoc) { |
| if (record.type === "throw") { |
| throw record.arg; |
| } |
| |
| if (record.type === "break" || |
| record.type === "continue") { |
| this.next = record.arg; |
| } else if (record.type === "return") { |
| this.rval = this.arg = record.arg; |
| this.method = "return"; |
| this.next = "end"; |
| } else if (record.type === "normal" && afterLoc) { |
| this.next = afterLoc; |
| } |
| |
| return ContinueSentinel; |
| }, |
| |
| finish: function(finallyLoc) { |
| for (var i = this.tryEntries.length - 1; i >= 0; --i) { |
| var entry = this.tryEntries[i]; |
| if (entry.finallyLoc === finallyLoc) { |
| this.complete(entry.completion, entry.afterLoc); |
| resetTryEntry(entry); |
| return ContinueSentinel; |
| } |
| } |
| }, |
| |
| "catch": function(tryLoc) { |
| for (var i = this.tryEntries.length - 1; i >= 0; --i) { |
| var entry = this.tryEntries[i]; |
| if (entry.tryLoc === tryLoc) { |
| var record = entry.completion; |
| if (record.type === "throw") { |
| var thrown = record.arg; |
| resetTryEntry(entry); |
| } |
| return thrown; |
| } |
| } |
| |
| // The context.catch method must only be called with a location |
| // argument that corresponds to a known catch block. |
| throw new Error("illegal catch attempt"); |
| }, |
| |
| delegateYield: function(iterable, resultName, nextLoc) { |
| this.delegate = { |
| iterator: values(iterable), |
| resultName: resultName, |
| nextLoc: nextLoc |
| }; |
| |
| if (this.method === "next") { |
| // Deliberately forget the last sent value so that we don't |
| // accidentally pass it on to the delegate. |
| this.arg = undefined; |
| } |
| |
| return ContinueSentinel; |
| } |
| }; |
| })( |
| // In sloppy mode, unbound `this` refers to the global object, fallback to |
| // Function constructor if we're in global strict mode. That is sadly a form |
| // of indirect eval which violates Content Security Policy. |
| (function() { return this })() || Function("return this")() |
| ); |