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