index.js

                                 finallyHandler);
    } else {
         var catchInstances = new Array(len - 1),
            j = 0, i;
        for (i = 0; i < len - 1; ++i) {
            var item = arguments[i];
            if (util.isObject(item)) {
                catchInstances[j++] = item;
            } else {
                return Promise.reject(new TypeError(
                    "tapCatch statement predicate: "
                    + "expecting an object but got " + util.classString(item)
                ));
            }
        }
        catchInstances.length = j;
        var handler = arguments[i];
        return this._passThrough(catchFilter(catchInstances, handler, this),
                                 1,
                                 undefined,
                                 finallyHandler);
    }

};

return PassThroughHandlerContext;
};


/***/ }),
/* 19 */
/***/ ((module, __unused_webpack_exports, __webpack_require__) => {

"use strict";

module.exports = function(NEXT_FILTER) {
var util = __webpack_require__(7);
var getKeys = (__webpack_require__(8).keys);
var tryCatch = util.tryCatch;
var errorObj = util.errorObj;

function catchFilter(instances, cb, promise) {
    return function(e) {
        var boundTo = promise._boundValue();
        predicateLoop: for (var i = 0; i < instances.length; ++i) {
            var item = instances[i];

            if (item === Error ||
                (item != null && item.prototype instanceof Error)) {
                if (e instanceof item) {
                    return tryCatch(cb).call(boundTo, e);
                }
            } else if (typeof item === "function") {
                var matchesPredicate = tryCatch(item).call(boundTo, e);
                if (matchesPredicate === errorObj) {
                    return matchesPredicate;
                } else if (matchesPredicate) {
                    return tryCatch(cb).call(boundTo, e);
                }
            } else if (util.isObject(e)) {
                var keys = getKeys(item);
                for (var j = 0; j < keys.length; ++j) {
                    var key = keys[j];
                    if (item[key] != e[key]) {
                        continue predicateLoop;
                    }
                }
                return tryCatch(cb).call(boundTo, e);
            }
        }
        return NEXT_FILTER;
    };
}

return catchFilter;
};


/***/ }),
/* 20 */
/***/ ((module, __unused_webpack_exports, __webpack_require__) => {

"use strict";

var util = __webpack_require__(7);
var maybeWrapAsError = util.maybeWrapAsError;
var errors = __webpack_require__(13);
var OperationalError = errors.OperationalError;
var es5 = __webpack_require__(8);

function isUntypedError(obj) {
    return obj instanceof Error &&
        es5.getPrototypeOf(obj) === Error.prototype;
}

var rErrorKey = /^(?:name|message|stack|cause)$/;
function wrapAsOperationalError(obj) {
    var ret;
    if (isUntypedError(obj)) {
        ret = new OperationalError(obj);
        ret.name = obj.name;
        ret.message = obj.message;
        ret.stack = obj.stack;
        var keys = es5.keys(obj);
        for (var i = 0; i < keys.length; ++i) {
            var key = keys[i];
            if (!rErrorKey.test(key)) {
                ret[key] = obj[key];
            }
        }
        return ret;
    }
    util.markAsOriginatingFromRejection(obj);
    return obj;
}

function nodebackForPromise(promise, multiArgs) {
    return function(err, value) {
        if (promise === null) return;
        if (err) {
            var wrapped = wrapAsOperationalError(maybeWrapAsError(err));
            promise._attachExtraTrace(wrapped);
            promise._reject(wrapped);
        } else if (!multiArgs) {
            promise._fulfill(value);
        } else {
            var $_len = arguments.length;var args = new Array(Math.max($_len - 1, 0)); for(var $_i = 1; $_i < $_len; ++$_i) {args[$_i - 1] = arguments[$_i];};
            promise._fulfill(args);
        }
        promise = null;
    };
}

module.exports = nodebackForPromise;


/***/ }),
/* 21 */
/***/ ((module, __unused_webpack_exports, __webpack_require__) => {

"use strict";

module.exports =
function(Promise, INTERNAL, tryConvertToPromise, apiRejection, debug) {
var util = __webpack_require__(7);
var tryCatch = util.tryCatch;

Promise.method = function (fn) {
    if (typeof fn !== "function") {
        throw new Promise.TypeError("expecting a function but got " + util.classString(fn));
    }
    return function () {
        var ret = new Promise(INTERNAL);
        ret._captureStackTrace();
        ret._pushContext();
        var value = tryCatch(fn).apply(this, arguments);
        var promiseCreated = ret._popContext();
        debug.checkForgottenReturns(
            value, promiseCreated, "Promise.method", ret);
        ret._resolveFromSyncValue(value);
        return ret;
    };
};

Promise.attempt = Promise["try"] = function (fn) {
    if (typeof fn !== "function") {
        return apiRejection("expecting a function but got " + util.classString(fn));
    }
    var ret = new Promise(INTERNAL);
    ret._captureStackTrace();
    ret._pushContext();
    var value;
    if (arguments.length > 1) {
        debug.deprecated("calling Promise.try with more than 1 argument");
        var arg = arguments[1];
        var ctx = arguments[2];
        value = util.isArray(arg) ? tryCatch(fn).apply(ctx, arg)
                                  : tryCatch(fn).call(ctx, arg);
    } else {
        value = tryCatch(fn)();
    }
    var promiseCreated = ret._popContext();
    debug.checkForgottenReturns(
        value, promiseCreated, "Promise.try", ret);
    ret._resolveFromSyncValue(value);
    return ret;
};

Promise.prototype._resolveFromSyncValue = function (value) {
    if (value === util.errorObj) {
        this._rejectCallback(value.e, false);
    } else {
        this._resolveCallback(value, true);
    }
};
};


/***/ }),
/* 22 */
/***/ ((module) => {

"use strict";

module.exports = function(Promise, INTERNAL, tryConvertToPromise, debug) {
var calledBind = false;
var rejectThis = function(_, e) {
    this._reject(e);
};

var targetRejected = function(e, context) {
    context.promiseRejectionQueued = true;
    context.bindingPromise._then(rejectThis, rejectThis, null, this, e);
};

var bindingResolved = function(thisArg, context) {
    if (((this._bitField & 50397184) === 0)) {
        this._resolveCallback(context.target);
    }
};

var bindingRejected = function(e, context) {
    if (!context.promiseRejectionQueued) this._reject(e);
};

Promise.prototype.bind = function (thisArg) {
    if (!calledBind) {
        calledBind = true;
        Promise.prototype._propagateFrom = debug.propagateFromFunction();
        Promise.prototype._boundValue = debug.boundValueFunction();
    }
    var maybePromise = tryConvertToPromise(thisArg);
    var ret = new Promise(INTERNAL);
    ret._propagateFrom(this, 1);
    var target = this._target();
    ret._setBoundTo(maybePromise);
    if (maybePromise instanceof Promise) {
        var context = {
            promiseRejectionQueued: false,
            promise: ret,
            target: target,
            bindingPromise: maybePromise
        };
        target._then(INTERNAL, targetRejected, undefined, ret, context);
        maybePromise._then(
            bindingResolved, bindingRejected, undefined, ret, context);
        ret._setOnCancel(maybePromise);
    } else {
        ret._resolveCallback(target);
    }
    return ret;
};

Promise.prototype._setBoundTo = function (obj) {
    if (obj !== undefined) {
        this._bitField = this._bitField | 2097152;
        this._boundTo = obj;
    } else {
        this._bitField = this._bitField & (~2097152);
    }
};

Promise.prototype._isBound = function () {
    return (this._bitField & 2097152) === 2097152;
};

Promise.bind = function (thisArg, value) {
    return Promise.resolve(value).bind(thisArg);
};
};


/***/ }),
/* 23 */
/***/ ((module, __unused_webpack_exports, __webpack_require__) => {

"use strict";

module.exports = function(Promise, PromiseArray, apiRejection, debug) {
var util = __webpack_require__(7);
var tryCatch = util.tryCatch;
var errorObj = util.errorObj;
var async = Promise._async;

Promise.prototype["break"] = Promise.prototype.cancel = function() {
    if (!debug.cancellation()) return this._warn("cancellation is disabled");

    var promise = this;
    var child = promise;
    while (promise._isCancellable()) {
        if (!promise._cancelBy(child)) {
            if (child._isFollowing()) {
                child._followee().cancel();
            } else {
                child._cancelBranched();
            }
            break;
        }

        var parent = promise._cancellationParent;
        if (parent == null || !parent._isCancellable()) {
            if (promise._isFollowing()) {
                promise._followee().cancel();
            } else {
                promise._cancelBranched();
            }
            break;
        } else {
            if (promise._isFollowing()) promise._followee().cancel();
            promise._setWillBeCancelled();
            child = promise;
            promise = parent;
        }
    }
};

Promise.prototype._branchHasCancelled = function() {
    this._branchesRemainingToCancel--;
};

Promise.prototype._enoughBranchesHaveCancelled = function() {
    return this._branchesRemainingToCancel === undefined ||
           this._branchesRemainingToCancel <= 0;
};

Promise.prototype._cancelBy = function(canceller) {
    if (canceller === this) {
        this._branchesRemainingToCancel = 0;
        this._invokeOnCancel();
        return true;
    } else {
        this._branchHasCancelled();
        if (this._enoughBranchesHaveCancelled()) {
            this._invokeOnCancel();
            return true;
        }
    }
    return false;
};

Promise.prototype._cancelBranched = function() {
    if (this._enoughBranchesHaveCancelled()) {
        this._cancel();
    }
};

Promise.prototype._cancel = function() {
    if (!this._isCancellable()) return;
    this._setCancelled();
    async.invoke(this._cancelPromises, this, undefined);
};

Promise.prototype._cancelPromises = function() {
    if (this._length() > 0) this._settlePromises();
};

Promise.prototype._unsetOnCancel = function() {
    this._onCancelField = undefined;
};

Promise.prototype._isCancellable = function() {
    return this.isPending() && !this._isCancelled();
};

Promise.prototype.isCancellable = function() {
    return this.isPending() && !this.isCancelled();
};

Promise.prototype._doInvokeOnCancel = function(onCancelCallback, internalOnly) {
    if (util.isArray(onCancelCallback)) {
        for (var i = 0; i < onCancelCallback.length; ++i) {
            this._doInvokeOnCancel(onCancelCallback[i], internalOnly);
        }
    } else if (onCancelCallback !== undefined) {
        if (typeof onCancelCallback === "function") {
            if (!internalOnly) {
                var e = tryCatch(onCancelCallback).call(this._boundValue());
                if (e === errorObj) {
                    this._attachExtraTrace(e.e);
                    async.throwLater(e.e);
                }
            }
        } else {
            onCancelCallback._resultCancelled(this);
        }
    }
};

Promise.prototype._invokeOnCancel = function() {
    var onCancelCallback = this._onCancel();
    this._unsetOnCancel();
    async.invoke(this._doInvokeOnCancel, this, onCancelCallback);
};

Promise.prototype._invokeInternalOnCancel = function() {
    if (this._isCancellable()) {
        this._doInvokeOnCancel(this._onCancel(), true);
        this._unsetOnCancel();
    }
};

Promise.prototype._resultCancelled = function() {
    this.cancel();
};

};


/***/ }),
/* 24 */
/***/ ((module) => {

"use strict";

module.exports = function(Promise) {
function returner() {
    return this.value;
}
function thrower() {
    throw this.reason;
}

Promise.prototype["return"] =
Promise.prototype.thenReturn = function (value) {
    if (value instanceof Promise) value.suppressUnhandledRejections();
    return this._then(
        returner, undefined, undefined, {value: value}, undefined);
};

Promise.prototype["throw"] =
Promise.prototype.thenThrow = function (reason) {
    return this._then(
        thrower, undefined, undefined, {reason: reason}, undefined);
};

Promise.prototype.catchThrow = function (reason) {
    if (arguments.length <= 1) {
        return this._then(
            undefined, thrower, undefined, {reason: reason}, undefined);
    } else {
        var _reason = arguments[1];
        var handler = function() {throw _reason;};
        return this.caught(reason, handler);
    }
};

Promise.prototype.catchReturn = function (value) {
    if (arguments.length <= 1) {
        if (value instanceof Promise) value.suppressUnhandledRejections();
        return this._then(
            undefined, returner, undefined, {value: value}, undefined);
    } else {
        var _value = arguments[1];
        if (_value instanceof Promise) _value.suppressUnhandledRejections();
        var handler = function() {return _value;};
        return this.caught(value, handler);
    }
};
};


/***/ }),
/* 25 */
/***/ ((module) => {

"use strict";

module.exports = function(Promise) {
function PromiseInspection(promise) {
    if (promise !== undefined) {
        promise = promise._target();
        this._bitField = promise._bitField;
        this._settledValueField = promise._isFateSealed()
            ? promise._settledValue() : undefined;
    }
    else {
        this._bitField = 0;
        this._settledValueField = undefined;
    }
}

PromiseInspection.prototype._settledValue = function() {
    return this._settledValueField;
};

var value = PromiseInspection.prototype.value = function () {
    if (!this.isFulfilled()) {
        throw new TypeError("cannot get fulfillment value of a non-fulfilled promise\u000a\u000a    See http://goo.gl/MqrFmX\u000a");
    }
    return this._settledValue();
};

var reason = PromiseInspection.prototype.error =
PromiseInspection.prototype.reason = function () {
    if (!this.isRejected()) {
        throw new TypeError("cannot get rejection reason of a non-rejected promise\u000a\u000a    See http://goo.gl/MqrFmX\u000a");
    }
    return this._settledValue();
};

var isFulfilled = PromiseInspection.prototype.isFulfilled = function() {
    return (this._bitField & 33554432) !== 0;
};

var isRejected = PromiseInspection.prototype.isRejected = function () {
    return (this._bitField & 16777216) !== 0;
};

var isPending = PromiseInspection.prototype.isPending = function () {
    return (this._bitField & 50397184) === 0;
};

var isResolved = PromiseInspection.prototype.isResolved = function () {
    return (this._bitField & 50331648) !== 0;
};

PromiseInspection.prototype.isCancelled = function() {
    return (this._bitField & 8454144) !== 0;
};

Promise.prototype.__isCancelled = function() {
    return (this._bitField & 65536) === 65536;
};

Promise.prototype._isCancelled = function() {
    return this._target().__isCancelled();
};

Promise.prototype.isCancelled = function() {
    return (this._target()._bitField & 8454144) !== 0;
};

Promise.prototype.isPending = function() {
    return isPending.call(this._target());
};

Promise.prototype.isRejected = function() {
    return isRejected.call(this._target());
};

Promise.prototype.isFulfilled = function() {
    return isFulfilled.call(this._target());
};

Promise.prototype.isResolved = function() {
    return isResolved.call(this._target());
};

Promise.prototype.value = function() {
    return value.call(this._target());
};

Promise.prototype.reason = function() {
    var target = this._target();
    target._unsetRejectionIsUnhandled();
    return reason.call(target);
};

Promise.prototype._value = function() {
    return this._settledValue();
};

Promise.prototype._reason = function() {
    this._unsetRejectionIsUnhandled();
    return this._settledValue();
};

Promise.PromiseInspection = PromiseInspection;
};


/***/ }),
/* 26 */
/***/ ((module, __unused_webpack_exports, __webpack_require__) => {

"use strict";

module.exports =
function(Promise, PromiseArray, tryConvertToPromise, INTERNAL, async) {
var util = __webpack_require__(7);
var canEvaluate = util.canEvaluate;
var tryCatch = util.tryCatch;
var errorObj = util.errorObj;
var reject;

if (true) {
if (canEvaluate) {
    var thenCallback = function(i) {
        return new Function("value", "holder", "                             \n\
            'use strict';                                                    \n\
            holder.pIndex = value;                                           \n\
            holder.checkFulfillment(this);                                   \n\
            ".replace(/Index/g, i));
    };

    var promiseSetter = function(i) {
        return new Function("promise", "holder", "                           \n\
            'use strict';                                                    \n\
            holder.pIndex = promise;                                         \n\
            ".replace(/Index/g, i));
    };

    var generateHolderClass = function(total) {
        var props = new Array(total);
        for (var i = 0; i < props.length; ++i) {
            props[i] = "this.p" + (i+1);
        }
        var assignment = props.join(" = ") + " = null;";
        var cancellationCode= "var promise;\n" + props.map(function(prop) {
            return "                                                         \n\
                promise = " + prop + ";                                      \n\
                if (promise instanceof Promise) {                            \n\
                    promise.cancel();                                        \n\
                }                                                            \n\
            ";
        }).join("\n");
        var passedArguments = props.join(", ");
        var name = "Holder$" + total;


        var code = "return function(tryCatch, errorObj, Promise, async) {    \n\
            'use strict';                                                    \n\
            function [TheName](fn) {                                         \n\
                [TheProperties]                                              \n\
                this.fn = fn;                                                \n\
                this.asyncNeeded = true;                                     \n\
                this.now = 0;                                                \n\
            }                                                                \n\
                                                                             \n\
            [TheName].prototype._callFunction = function(promise) {          \n\
                promise._pushContext();                                      \n\
                var ret = tryCatch(this.fn)([ThePassedArguments]);           \n\
                promise._popContext();                                       \n\
                if (ret === errorObj) {                                      \n\
                    promise._rejectCallback(ret.e, false);                   \n\
                } else {                                                     \n\
                    promise._resolveCallback(ret);                           \n\
                }                                                            \n\
            };                                                               \n\
                                                                             \n\
            [TheName].prototype.checkFulfillment = function(promise) {       \n\
                var now = ++this.now;                                        \n\
                if (now === [TheTotal]) {                                    \n\
                    if (this.asyncNeeded) {                                  \n\
                        async.invoke(this._callFunction, this, promise);     \n\
                    } else {                                                 \n\
                        this._callFunction(promise);                         \n\
                    }                                                        \n\
                                                                             \n\
                }                                                            \n\
            };                                                               \n\
                                                                             \n\
            [TheName].prototype._resultCancelled = function() {              \n\
                [CancellationCode]                                           \n\
            };                                                               \n\
                                                                             \n\
            return [TheName];                                                \n\
        }(tryCatch, errorObj, Promise, async);                               \n\
        ";

        code = code.replace(/\[TheName\]/g, name)
            .replace(/\[TheTotal\]/g, total)
            .replace(/\[ThePassedArguments\]/g, passedArguments)
            .replace(/\[TheProperties\]/g, assignment)
            .replace(/\[CancellationCode\]/g, cancellationCode);

        return new Function("tryCatch", "errorObj", "Promise", "async", code)
                           (tryCatch, errorObj, Promise, async);
    };

    var holderClasses = [];
    var thenCallbacks = [];
    var promiseSetters = [];

    for (var i = 0; i < 8; ++i) {
        holderClasses.push(generateHolderClass(i + 1));
        thenCallbacks.push(thenCallback(i + 1));
        promiseSetters.push(promiseSetter(i + 1));
    }

    reject = function (reason) {
        this._reject(reason);
    };
}}

Promise.join = function () {
    var last = arguments.length - 1;
    var fn;
    if (last > 0 && typeof arguments[last] === "function") {
        fn = arguments[last];
        if (true) {
            if (last <= 8 && canEvaluate) {
                var ret = new Promise(INTERNAL);
                ret._captureStackTrace();
                var HolderClass = holderClasses[last - 1];
                var holder = new HolderClass(fn);
                var callbacks = thenCallbacks;

                for (var i = 0; i < last; ++i) {
                    var maybePromise = tryConvertToPromise(arguments[i], ret);
                    if (maybePromise instanceof Promise) {
                        maybePromise = maybePromise._target();
                        var bitField = maybePromise._bitField;
                        ;
                        if (((bitField & 50397184) === 0)) {
                            maybePromise._then(callbacks[i], reject,
                                               undefined, ret, holder);
                            promiseSetters[i](maybePromise, holder);
                            holder.asyncNeeded = false;
                        } else if (((bitField & 33554432) !== 0)) {
                            callbacks[i].call(ret,
                                              maybePromise._value(), holder);
                        } else if (((bitField & 16777216) !== 0)) {
                            ret._reject(maybePromise._reason());
                        } else {
                            ret._cancel();
                        }
                    } else {
                        callbacks[i].call(ret, maybePromise, holder);
                    }
                }

                if (!ret._isFateSealed()) {
                    if (holder.asyncNeeded) {
                        var context = Promise._getContext();
                        holder.fn = util.contextBind(context, holder.fn);
                    }
                    ret._setAsyncGuaranteed();
                    ret._setOnCancel(holder);
                }
                return ret;
            }
        }
    }
    var $_len = arguments.length;var args = new Array($_len); for(var $_i = 0; $_i < $_len ; ++$_i) {args[$_i] = arguments[$_i ];};
    if (fn) args.pop();
    var ret = new PromiseArray(args).promise();
    return fn !== undefined ? ret.spread(fn) : ret;
};

};


/***/ }),
/* 27 */
/***/ ((module, __unused_webpack_exports, __webpack_require__) => {

"use strict";

var cr = Object.create;
if (cr) {
    var callerCache = cr(null);
    var getterCache = cr(null);
    callerCache[" size"] = getterCache[" size"] = 0;
}

module.exports = function(Promise) {
var util = __webpack_require__(7);
var canEvaluate = util.canEvaluate;
var isIdentifier = util.isIdentifier;

var getMethodCaller;
var getGetter;
if (true) {
var makeMethodCaller = function (methodName) {
    return new Function("ensureMethod", "                                    \n\
        return function(obj) {                                               \n\
            'use strict'                                                     \n\
            var len = this.length;                                           \n\
            ensureMethod(obj, 'methodName');                                 \n\
            switch(len) {                                                    \n\
                case 1: return obj.methodName(this[0]);                      \n\
                case 2: return obj.methodName(this[0], this[1]);             \n\
                case 3: return obj.methodName(this[0], this[1], this[2]);    \n\
                case 0: return obj.methodName();                             \n\
                default:                                                     \n\
                    return obj.methodName.apply(obj, this);                  \n\
            }                                                                \n\
        };                                                                   \n\
        ".replace(/methodName/g, methodName))(ensureMethod);
};

var makeGetter = function (propertyName) {
    return new Function("obj", "                                             \n\
        'use strict';                                                        \n\
        return obj.propertyName;                                             \n\
        ".replace("propertyName", propertyName));
};

var getCompiled = function(name, compiler, cache) {
    var ret = cache[name];
    if (typeof ret !== "function") {
        if (!isIdentifier(name)) {
            return null;
        }
        ret = compiler(name);
        cache[name] = ret;
        cache[" size"]++;
        if (cache[" size"] > 512) {
            var keys = Object.keys(cache);
            for (var i = 0; i < 256; ++i) delete cache[keys[i]];
            cache[" size"] = keys.length - 256;
        }
    }
    return ret;
};

getMethodCaller = function(name) {
    return getCompiled(name, makeMethodCaller, callerCache);
};

getGetter = function(name) {
    return getCompiled(name, makeGetter, getterCache);
};
}

function ensureMethod(obj, methodName) {
    var fn;
    if (obj != null) fn = obj[methodName];
    if (typeof fn !== "function") {
        var message = "Object " + util.classString(obj) + " has no method '" +
            util.toString(methodName) + "'";
        throw new Promise.TypeError(message);
    }
    return fn;
}

function caller(obj) {
    var methodName = this.pop();
    var fn = ensureMethod(obj, methodName);
    return fn.apply(obj, this);
}
Promise.prototype.call = function (methodName) {
    var $_len = arguments.length;var args = new Array(Math.max($_len - 1, 0)); for(var $_i = 1; $_i < $_len; ++$_i) {args[$_i - 1] = arguments[$_i];};
    if (true) {
        if (canEvaluate) {
            var maybeCaller = getMethodCaller(methodName);
            if (maybeCaller !== null) {
                return this._then(
                    maybeCaller, undefined, undefined, args, undefined);
            }
        }
    }
    args.push(methodName);
    return this._then(caller, undefined, undefined, args, undefined);
};

function namedGetter(obj) {
    return obj[this];
}
function indexedGetter(obj) {
    var index = +this;
    if (index < 0) index = Math.max(0, index + obj.length);
    return obj[index];
}
Promise.prototype.get = function (propertyName) {
    var isIndex = (typeof propertyName === "number");
    var getter;
    if (!isIndex) {
        if (canEvaluate) {
            var maybeGetter = getGetter(propertyName);
            getter = maybeGetter !== null ? maybeGetter : namedGetter;
        } else {
            getter = namedGetter;
        }
    } else {
        getter = indexedGetter;
    }
    return this._then(getter, undefined, undefined, propertyName, undefined);
};
};


/***/ }),
/* 28 */
/***/ ((module, __unused_webpack_exports, __webpack_require__) => {

"use strict";

module.exports = function(Promise,
                          apiRejection,
                          INTERNAL,
                          tryConvertToPromise,
                          Proxyable,
                          debug) {
var errors = __webpack_require__(13);
var TypeError = errors.TypeError;
var util = __webpack_require__(7);
var errorObj = util.errorObj;
var tryCatch = util.tryCatch;
var yieldHandlers = [];

function promiseFromYieldHandler(value, yieldHandlers, traceParent) {
    for (var i = 0; i < yieldHandlers.length; ++i) {
        traceParent._pushContext();
        var result = tryCatch(yieldHandlers[i])(value);
        traceParent._popContext();
        if (result === errorObj) {
            traceParent._pushContext();
            var ret = Promise.reject(errorObj.e);
            traceParent._popContext();
            return ret;
        }
        var maybePromise = tryConvertToPromise(result, traceParent);
        if (maybePromise instanceof Promise) return maybePromise;
    }
    return null;
}

function PromiseSpawn(generatorFunction, receiver, yieldHandler, stack) {
    if (debug.cancellation()) {
        var internal = new Promise(INTERNAL);
        var _finallyPromise = this._finallyPromise = new Promise(INTERNAL);
        this._promise = internal.lastly(function() {
            return _finallyPromise;
        });
        internal._captureStackTrace();
        internal._setOnCancel(this);
    } else {
        var promise = this._promise = new Promise(INTERNAL);
        promise._captureStackTrace();
    }
    this._stack = stack;
    this._generatorFunction = generatorFunction;
    this._receiver = receiver;
    this._generator = undefined;
    this._yieldHandlers = typeof yieldHandler === "function"
        ? [yieldHandler].concat(yieldHandlers)
        : yieldHandlers;
    this._yieldedPromise = null;
    this._cancellationPhase = false;
}
util.inherits(PromiseSpawn, Proxyable);

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;
};