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136
node_modules/bluebird/js/main/generators.js
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136
node_modules/bluebird/js/main/generators.js
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"use strict";
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module.exports = function(Promise,
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apiRejection,
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INTERNAL,
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tryConvertToPromise) {
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var errors = require("./errors.js");
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var TypeError = errors.TypeError;
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var util = require("./util.js");
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var errorObj = util.errorObj;
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var tryCatch = util.tryCatch;
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var yieldHandlers = [];
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function promiseFromYieldHandler(value, yieldHandlers, traceParent) {
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for (var i = 0; i < yieldHandlers.length; ++i) {
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traceParent._pushContext();
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var result = tryCatch(yieldHandlers[i])(value);
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traceParent._popContext();
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if (result === errorObj) {
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traceParent._pushContext();
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var ret = Promise.reject(errorObj.e);
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traceParent._popContext();
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return ret;
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}
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var maybePromise = tryConvertToPromise(result, traceParent);
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if (maybePromise instanceof Promise) return maybePromise;
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}
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return null;
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}
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function PromiseSpawn(generatorFunction, receiver, yieldHandler, stack) {
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var promise = this._promise = new Promise(INTERNAL);
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promise._captureStackTrace();
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this._stack = stack;
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this._generatorFunction = generatorFunction;
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this._receiver = receiver;
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this._generator = undefined;
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this._yieldHandlers = typeof yieldHandler === "function"
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? [yieldHandler].concat(yieldHandlers)
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: yieldHandlers;
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}
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PromiseSpawn.prototype.promise = function () {
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return this._promise;
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};
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PromiseSpawn.prototype._run = function () {
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this._generator = this._generatorFunction.call(this._receiver);
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this._receiver =
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this._generatorFunction = undefined;
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this._next(undefined);
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};
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PromiseSpawn.prototype._continue = function (result) {
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if (result === errorObj) {
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return this._promise._rejectCallback(result.e, false, true);
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}
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var value = result.value;
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if (result.done === true) {
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this._promise._resolveCallback(value);
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} else {
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var maybePromise = tryConvertToPromise(value, this._promise);
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if (!(maybePromise instanceof Promise)) {
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maybePromise =
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promiseFromYieldHandler(maybePromise,
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this._yieldHandlers,
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this._promise);
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if (maybePromise === null) {
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this._throw(
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new TypeError(
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"A value %s was yielded that could not be treated as a promise\u000a\u000a See http://goo.gl/4Y4pDk\u000a\u000a".replace("%s", value) +
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"From coroutine:\u000a" +
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this._stack.split("\n").slice(1, -7).join("\n")
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)
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);
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return;
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}
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}
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maybePromise._then(
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this._next,
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this._throw,
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undefined,
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this,
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null
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);
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}
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};
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PromiseSpawn.prototype._throw = function (reason) {
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this._promise._attachExtraTrace(reason);
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this._promise._pushContext();
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var result = tryCatch(this._generator["throw"])
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.call(this._generator, reason);
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this._promise._popContext();
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this._continue(result);
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};
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PromiseSpawn.prototype._next = function (value) {
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this._promise._pushContext();
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var result = tryCatch(this._generator.next).call(this._generator, value);
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this._promise._popContext();
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this._continue(result);
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};
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Promise.coroutine = function (generatorFunction, options) {
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if (typeof generatorFunction !== "function") {
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throw new TypeError("generatorFunction must be a function\u000a\u000a See http://goo.gl/6Vqhm0\u000a");
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}
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var yieldHandler = Object(options).yieldHandler;
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var PromiseSpawn$ = PromiseSpawn;
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var stack = new Error().stack;
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return function () {
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var generator = generatorFunction.apply(this, arguments);
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var spawn = new PromiseSpawn$(undefined, undefined, yieldHandler,
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stack);
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spawn._generator = generator;
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spawn._next(undefined);
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return spawn.promise();
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};
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};
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Promise.coroutine.addYieldHandler = function(fn) {
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if (typeof fn !== "function") throw new TypeError("fn must be a function\u000a\u000a See http://goo.gl/916lJJ\u000a");
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yieldHandlers.push(fn);
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};
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Promise.spawn = function (generatorFunction) {
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if (typeof generatorFunction !== "function") {
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return apiRejection("generatorFunction must be a function\u000a\u000a See http://goo.gl/6Vqhm0\u000a");
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}
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var spawn = new PromiseSpawn(generatorFunction, this);
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var ret = spawn.promise();
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spawn._run(Promise.spawn);
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return ret;
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};
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};
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