/** * Copyright (c) 2014, Facebook, Inc. * All rights reserved. * * This source code is licensed under the BSD-style license found in the * https://raw.github.com/facebook/regenerator/master/LICENSE file. An * additional grant of patent rights can be found in the PATENTS file in * the same directory. */ !(function(global) { "use strict"; var hasOwn = Object.prototype.hasOwnProperty; var undefined; // More compressible than void 0. var $Symbol = typeof Symbol === "function" ? Symbol : {}; var iteratorSymbol = $Symbol.iterator || "@@iterator"; 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, then outerFn.prototype instanceof Generator. var generator = Object.create((outerFn || Generator).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() {} var Gp = GeneratorFunctionPrototype.prototype = Generator.prototype; 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 // `value instanceof AwaitArgument` to determine if the yielded value is // meant to be awaited. Some may consider the name of this method too // cutesy, but they are curmudgeons. runtime.awrap = function(arg) { return new AwaitArgument(arg); }; function AwaitArgument(arg) { this.arg = 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 instanceof AwaitArgument) { return Promise.resolve(value.arg).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); } } if (typeof process === "object" && process.domain) { invoke = process.domain.bind(invoke); } 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); // 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(); } while (true) { var delegate = context.delegate; if (delegate) { if (method === "return" || (method === "throw" && delegate.iterator[method] === undefined)) { // A return or throw (when the delegate iterator has no throw // method) always terminates the yield* loop. context.delegate = null; // If the delegate iterator has a return method, give it a // chance to clean up. var returnMethod = delegate.iterator["return"]; if (returnMethod) { var record = tryCatch(returnMethod, delegate.iterator, arg); if (record.type === "throw") { // If the return method threw an exception, let that // exception prevail over the original return or throw. method = "throw"; arg = record.arg; continue; } } if (method === "return") { // Continue with the outer return, now that the delegate // iterator has been terminated. continue; } } var record = tryCatch( delegate.iterator[method], delegate.iterator, arg ); if (record.type === "throw") { context.delegate = null; // Like returning generator.throw(uncaught), but without the // overhead of an extra function call. method = "throw"; arg = record.arg; continue; } // Delegate generator ran and handled its own exceptions so // regardless of what the method was, we continue as if it is // "next" with an undefined arg. method = "next"; arg = undefined; var info = record.arg; if (info.done) { context[delegate.resultName] = info.value; context.next = delegate.nextLoc; } else { state = GenStateSuspendedYield; return info; } context.delegate = null; } if (method === "next") { // Setting context._sent for legacy support of Babel's // function.sent implementation. context.sent = context._sent = arg; } else if (method === "throw") { if (state === GenStateSuspendedStart) { state = GenStateCompleted; throw arg; } if (context.dispatchException(arg)) { // If the dispatched exception was caught by a catch block, // then let that catch block handle the exception normally. method = "next"; arg = undefined; } } else if (method === "return") { context.abrupt("return", 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; var info = { value: record.arg, done: context.done }; if (record.arg === ContinueSentinel) { if (context.delegate && method === "next") { // Deliberately forget the last sent value so that we don't // accidentally pass it on to the delegate. arg = undefined; } } else { return info; } } else if (record.type === "throw") { state = GenStateCompleted; // Dispatch the exception by looping back around to the // context.dispatchException(arg) call above. method = "throw"; arg = record.arg; } } }; } // Define Generator.prototype.{next,throw,return} in terms of the // unified ._invoke helper method. defineIteratorMethods(Gp); Gp[iteratorSymbol] = function() { return this; }; Gp[toStringTagSymbol] = "Generator"; 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.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; 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.next = finallyEntry.finallyLoc; } else { this.complete(record); } return ContinueSentinel; }, 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 = record.arg; this.next = "end"; } else if (record.type === "normal" && afterLoc) { this.next = afterLoc; } }, 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 }; return ContinueSentinel; } }; })( // Among the various tricks for obtaining a reference to the global // object, this seems to be the most reliable technique that does not // use indirect eval (which violates Content Security Policy). typeof global === "object" ? global : typeof window === "object" ? window : typeof self === "object" ? self : this );