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generators.js

"use strict";
module.exports = function(Promise,
                          apiRejection,
                          INTERNAL,
                          tryConvertToPromise,
                          Proxyable,
                          debug) {
var errors = require("./errors");
var TypeError = errors.TypeError;
var util = require("./util");
var errorObj = util.errorObj;
var tryCatch = util.tryCatch;
var yieldHandlers = [];

PromiseSpawn.prototype._isResolved = function() {
    return this._promise === null;
};

PromiseSpawn.prototype._cleanup = function() {
    this._promise = this._generator = null;
    if (debug.cancellation() && this._finallyPromise !== null) {
        this._finallyPromise._fulfill();
        this._finallyPromise = null;
    }
};

PromiseSpawn.prototype._promiseCancelled = function() {
    if (this._isResolved()) return;
    var implementsReturn = typeof this._generator["return"] !== "undefined";

var result;
    if (!implementsReturn) {
        var reason = new Promise.CancellationError(
            "generator .return() sentinel");
        Promise.coroutine.returnSentinel = reason;
        this._promise._attachExtraTrace(reason);
        this._promise._pushContext();
        result = tryCatch(this._generator["throw"]).call(this._generator,
                                                         reason);
        this._promise._popContext();
    } else {
        this._promise._pushContext();
        result = tryCatch(this._generator["return"]).call(this._generator,
                                                          undefined);
        this._promise._popContext();
    }
    this._cancellationPhase = true;
    this._yieldedPromise = null;
    this._continue(result);
};

PromiseSpawn.prototype._promiseFulfilled = function(value) {
    this._yieldedPromise = null;
    this._promise._pushContext();
    var result = tryCatch(this._generator.next).call(this._generator, value);
    this._promise._popContext();
    this._continue(result);
};

PromiseSpawn.prototype._promiseRejected = function(reason) {
    this._yieldedPromise = null;
    this._promise._attachExtraTrace(reason);
    this._promise._pushContext();
    var result = tryCatch(this._generator["throw"])
        .call(this._generator, reason);
    this._promise._popContext();
    this._continue(result);
};

PromiseSpawn.prototype._resultCancelled = function() {
    if (this._yieldedPromise instanceof Promise) {
        var promise = this._yieldedPromise;
        this._yieldedPromise = null;
        promise.cancel();
    }
};

PromiseSpawn.prototype.promise = function () {
    return this._promise;
};

PromiseSpawn.prototype._run = function () {
    this._generator = this._generatorFunction.call(this._receiver);
    this._receiver =
        this._generatorFunction = undefined;
    this._promiseFulfilled(undefined);
};

PromiseSpawn.prototype._continue = function (result) {
    var promise = this._promise;
    if (result === errorObj) {
        this._cleanup();
        if (this._cancellationPhase) {
            return promise.cancel();
        } else {
            return promise._rejectCallback(result.e, false);
        }
    }

Promise.coroutine = function (generatorFunction, options) {
    if (typeof generatorFunction !== "function") {
        throw new TypeError("generatorFunction must be a function\u000a\u000a    See http://goo.gl/MqrFmX\u000a");
    }
    var yieldHandler = Object(options).yieldHandler;
    var PromiseSpawn$ = PromiseSpawn;
    var stack = new Error().stack;
    return function () {
        var generator = generatorFunction.apply(this, arguments);
        var spawn = new PromiseSpawn$(undefined, undefined, yieldHandler,
                                      stack);
        var ret = spawn.promise();
        spawn._generator = generator;
        spawn._promiseFulfilled(undefined);
        return ret;
    };
};

Promise.coroutine.addYieldHandler = function(fn) {
    if (typeof fn !== "function") {
        throw new TypeError("expecting a function but got " + util.classString(fn));
    }
    yieldHandlers.push(fn);
};

Promise.spawn = function (generatorFunction) {
    debug.deprecated("Promise.spawn()", "Promise.coroutine()");
    if (typeof generatorFunction !== "function") {
        return apiRejection("generatorFunction must be a function\u000a\u000a    See http://goo.gl/MqrFmX\u000a");
    }
    var spawn = new PromiseSpawn(generatorFunction, this);
    var ret = spawn.promise();
    spawn._run(Promise.spawn);
    return ret;
};
};

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