q.js

// vim:ts=4:sts=4:sw=4:
/*jshint browser: true, node: true,
  curly: true, eqeqeq: true, noarg: true, nonew: true, trailing: true,
  undef: true
 */
/*global define: false, Q: true, msSetImmediate: true, setImmediate: true,
  MessageChannel: true */
/*!
 *
 * Copyright 2009-2012 Kris Kowal under the terms of the MIT
 * license found at http://github.com/kriskowal/q/raw/master/LICENSE
 *
 * With parts by Tyler Close
 * Copyright 2007-2009 Tyler Close under the terms of the MIT X license found
 * at http://www.opensource.org/licenses/mit-license.html
 * Forked at ref_send.js version: 2009-05-11
 *
 * With parts by Mark Miller
 * Copyright (C) 2011 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

(function (definition) {

    // This file will function properly as a <script> tag, or a module
    // using CommonJS and NodeJS or RequireJS module formats.  In
    // Common/Node/RequireJS, the module exports the Q API and when
    // executed as a simple <script>, it creates a Q global instead.

    // RequireJS
    if (typeof define === "function") {
        define(definition);

    // CommonJS
    } else if (typeof exports === "object") {
        definition(void 0, exports);

    // SES (Secure EcmaScript)
    } else if (typeof ses !== "undefined") {
        if (!ses.ok()) {
            return;
        } else {
            ses.makeQ = function () {
                var Q = {};
                return definition(void 0, Q);
            };
        }

    // <script>
    } else {
        definition(void 0, Q = {});
    }

})(function (require, exports) {
"use strict";

// shims

// used for default "defend" and in "allResolved"
var noop = function () {};

// for the security conscious, defend may be a deep freeze as provided
// by cajaVM.  Otherwise we try to provide a shallow freeze just to
// discourage promise changes that are not compatible with secure
// usage.  If Object.freeze does not exist, fall back to doing nothing
// (no op).
var defend = Object.freeze || noop;
if (typeof cajaVM !== "undefined") {
    defend = cajaVM.def;
}

// use the fastest possible means to execute a task in a future turn
// of the event loop.
var nextTick;
if (typeof process !== "undefined") {
    // node
    nextTick = process.nextTick;
} else if (typeof msSetImmediate === "function") {
    // IE 10 only, at the moment
    nextTick = msSetImmediate;
} else if (typeof setImmediate === "function") {
    // https://github.com/NobleJS/setImmediate
    nextTick = setImmediate;
} else if (typeof MessageChannel !== "undefined") {
    // modern browsers
    // http://www.nonblocking.io/2011/06/windownexttick.html
    var channel = new MessageChannel();
    // linked list of tasks (single, with head node)
    var head = {}, tail = head;
    channel.port1.onmessage = function () {
        head = head.next;
        var task = head.task;
        delete head.task;
        task();
    };
    nextTick = function (task) {
        tail = tail.next = {task: task};
        channel.port2.postMessage(0);
    };
} else {
    // old browsers
    nextTick = function (task) {
        setTimeout(task, 0);
    };
}

// Attempt to make generics safe in the face of downstream
// modifications.
// There is no situation where this is necessary.
// If you need a security guarantee, these primordials need to be
// deeply frozen anyway, and if you don’t need a security guarantee,
// this is just plain paranoid.
// However, this does have the nice side-effect of reducing the size
// of the code by reducing x.call() to merely x(), eliminating many
// hard-to-minify characters.
// See Mark Miller’s explanation of what this does.
// http://wiki.ecmascript.org/doku.php?id=conventions:safe_meta_programming
var uncurryThis;
// I have kept both variations because the first is theoretically
// faster, if bind is available.
if (Function.prototype.bind) {
    var Function_bind = Function.prototype.bind;
    uncurryThis = Function_bind.bind(Function_bind.call);
} else {
    uncurryThis = function (f) {
        return function (thisp) {
            return f.call.apply(f, arguments);
        };
    };
}

var Array_slice = uncurryThis(Array.prototype.slice);

var Array_reduce = uncurryThis(Array.prototype.reduce || function (callback, basis) {
    var index = 0,
        length = this.length;
    // concerning the initial value, if one is not provided
    if (arguments.length === 1) {
        // seek to the first value in the array, accounting
        // for the possibility that is is a sparse array
        do {
            if (index in this) {
                basis = this[index++];
                break;
            }
            if (++index >= length) {
                throw new TypeError();
            }
        } while (1);
    }
    // reduce
    for (; index < length; index++) {
        // account for the possibility that the array is sparse
        if (index in this) {
            basis = callback(basis, this[index], index);
        }
    }
    return basis;
});

var Object_create = Object.create || function (prototype) {
    function Type() { }
    Type.prototype = prototype;
    return new Type();
};

var Object_keys = Object.keys || function (object) {
    var keys = [];
    for (var key in object) {
        keys.push(key);
    }
    return keys;
};

var Object_toString = Object.prototype.toString;

function isStopIteration(exception) {
    return Object_toString(exception) === "[object StopIteration]";
}

/**
 * Performs a task in a future turn of the event loop.
 * @param {Function} task
 */
exports.nextTick = nextTick;

/**
 * Constructs a {promise, resolve} object.
 *
 * The resolver is a callback to invoke with a more resolved value for the
 * promise. To fulfill the promise, invoke the resolver with any value that is
 * not a function. To reject the promise, invoke the resolver with a rejection
 * object. To put the promise in the same state as another promise, invoke the
 * resolver with that other promise.
 */
exports.defer = defer;
function defer() {
    // if "pending" is an "Array", that indicates that the promise has not yet
    // been resolved.  If it is "undefined", it has been resolved.  Each
    // element of the pending array is itself an array of complete arguments to
    // forward to the resolved promise.  We coerce the resolution value to a
    // promise using the ref promise because it handles both fully
    // resolved values and other promises gracefully.
    var pending = [], value;

    var deferred = Object_create(defer.prototype);
    var promise = Object_create(makePromise.prototype);

    promise.promiseSend = function () {
        var args = Array_slice(arguments);
        if (pending) {
            pending.push(args);
        } else {
            nextTick(function () {
                value.promiseSend.apply(value, args);
            });
        }
    };

    promise.valueOf = function () {
        if (pending) {
            return promise;
        }
        return value.valueOf();
    };

    function become(resolvedValue) {
        if (!pending) {
            return;
        }
        value = resolve(resolvedValue);
        Array_reduce(pending, function (undefined, pending) {
            nextTick(function () {
                value.promiseSend.apply(value, pending);
            });
        }, void 0);
        pending = void 0;
        return value;
    }

    defend(promise);

    deferred.promise = promise;
    deferred.resolve = become;
    deferred.reject = function (exception) {
        return become(reject(exception));
    };

    return deferred;
}

/**
 * Creates a Node-style callback that will resolve or reject the deferred
 * promise.
 * @returns a nodeback
 */
defer.prototype.makeNodeResolver = function () {
    var self = this;
    return function (error, value) {
        if (error) {
            self.reject(error);
        } else if (arguments.length > 2) {
            self.resolve(Array_slice(arguments, 1));
        } else {
            self.resolve(value);
        }
    };
};

/**
 * @param makePromise {Function} a function that returns nothing and accepts
 * the resolve and reject functions for a deferred.
 * @returns a promise that may be resolved with the given resolve and reject
 * functions, or rejected by a thrown exception in makePromise
 */
exports.promise = promise;
function promise(makePromise) {
    var deferred = defer();
    call(
        makePromise,
        void 0,
        deferred.resolve,
        deferred.reject
    ).fail(deferred.reject);
    return deferred.promise;
}

/**
 * Constructs a Promise with a promise descriptor object and optional fallback
 * function.  The descriptor contains methods like when(rejected), get(name),
 * put(name, value), post(name, args), and delete(name), which all
 * return either a value, a promise for a value, or a rejection.  The fallback
 * accepts the operation name, a resolver, and any further arguments that would
 * have been forwarded to the appropriate method above had a method been
 * provided with the proper name.  The API makes no guarantees about the nature
 * of the returned object, apart from that it is usable whereever promises are
 * bought and sold.
 */
exports.makePromise = makePromise;
function makePromise(descriptor, fallback, valueOf, rejected) {
    if (fallback === void 0) {
        fallback = function (op) {
            return reject(new Error("Promise does not support operation: " + op));
        };
    }

    var promise = Object_create(makePromise.prototype);

    promise.promiseSend = function (op, resolved /* ...args */) {
        var args = Array_slice(arguments, 2);
        var result;
        try {
            if (descriptor[op]) {
                result = descriptor[op].apply(promise, args);
            } else {
                result = fallback.apply(promise, [op].concat(args));
            }
        } catch (exception) {
            result = reject(exception);
        }
        resolved(result);
    };

    if (valueOf) {
        promise.valueOf = valueOf;
    }

    if (rejected) {
        promise.promiseRejected = true;
    }

    defend(promise);

    return promise;
}

// provide thenables, CommonJS/Promises/A
makePromise.prototype.then = function (fulfilled, rejected) {
    return when(this, fulfilled, rejected);
};

// Chainable methods
Array_reduce(
    [
        "isResolved", "isFulfilled", "isRejected",
        "when", "spread", "send",
        "get", "put", "del",
        "post", "invoke",
        "keys",
        "apply", "call", "bind",
        "fapply", "fcall", "fbind",
        "all", "allResolved",
        "view", "viewInfo",
        "timeout", "delay",
        "catch", "finally", "fail", "fin", "end"
    ],
    function (prev, name) {
        makePromise.prototype[name] = function () {
            return exports[name].apply(
                exports,
                [this].concat(Array_slice(arguments))
            );
        };
    },
    void 0
);

makePromise.prototype.toSource = function () {
    return this.toString();
};

makePromise.prototype.toString = function () {
    return '[object Promise]';
};

defend(makePromise.prototype);

/**
 * If an object is not a promise, it is as "near" as possible.
 * If a promise is rejected, it is as "near" as possible too.
 * If it’s a fulfilled promise, the fulfillment value is nearer.
 * If it’s a deferred promise and the deferred has been resolved, the
 * resolution is "nearer".
 * @param object
 * @returns most resolved (nearest) form of the object
 */
exports.nearer = valueOf;
function valueOf(value) {
    // if !Object.isObject(value)
    if (Object(value) !== value) {
        return value;
    } else {
        return value.valueOf();
    }
}

/**
 * @returns whether the given object is a promise.
 * Otherwise it is a fulfilled value.
 */
exports.isPromise = isPromise;
function isPromise(object) {
    return object && typeof object.promiseSend === "function";
}

/**
 * @returns whether the given object is a resolved promise.
 */
exports.isResolved = isResolved;
function isResolved(object) {
    return isFulfilled(object) || isRejected(object);
}

/**
 * @returns whether the given object is a value or fulfilled
 * promise.
 */
exports.isFulfilled = isFulfilled;
function isFulfilled(object) {
    return !isPromise(valueOf(object));
}

/**
 * @returns whether the given object is a rejected promise.
 */
exports.isRejected = isRejected;
function isRejected(object) {
    object = valueOf(object);
    return object && !!object.promiseRejected;
}

var rejections = [];
var errors = [];
if (typeof window !== "undefined") {
    // This promise library consumes exceptions thrown in handlers so
    // they can be handled by a subsequent promise.  The rejected
    // promises get added to this array when they are created, and
    // removed when they are handled.
    console.log("Should be empty:", errors);
}

/**
 * Constructs a rejected promise.
 * @param exception value describing the failure
 */
exports.reject = reject;
function reject(exception) {
    var rejection = makePromise({
        "when": function (rejected) {
            // note that the error has been handled
            if (rejected) {
                var at = rejections.indexOf(this);
                if (at !== -1) {
                    errors.splice(at, 1);
                    rejections.splice(at, 1);
                }
            }
            return rejected ? rejected(exception) : reject(exception);
        }
    }, function fallback(op) {
        return reject(exception);
    }, function valueOf() {
        return reject(exception);
    }, true);
    // note that the error has not been handled
    rejections.push(rejection);
    errors.push(exception);
    return rejection;
}

/**
 * Constructs a promise for an immediate reference.
 * @param value immediate reference
 */
exports.begin = resolve;
exports.resolve = resolve;
exports.ref = resolve; // XXX deprecated
function resolve(object) {
    // If the object is already a Promise, return it directly.  This enables
    // the resolve function to both be used to created references from objects,
    // but to tolerably coerce non-promises to promises.
    if (isPromise(object)) {
        return object;
    }
    // assimilate thenables, CommonJS/Promises/A
    if (object && typeof object.then === "function") {
        var result = defer();
        object.then(result.resolve, result.reject);
        return result.promise;
    }
    return makePromise({
        "when": function (rejected) {
            return object;
        },
        "get": function (name) {
            return object[name];
        },
        "put": function (name, value) {
            return object[name] = value;
        },
        "del": function (name) {
            return delete object[name];
        },
        "post": function (name, value) {
            return object[name].apply(object, value);
        },
        "apply": function (self, args) {
            return object.apply(self, args);
        },
        "viewInfo": function () {
            var on = object;
            var properties = {};

            function fixFalsyProperty(name) {
                if (!properties[name]) {
                    properties[name] = typeof on[name];
                }
            }

            while (on) {
                Object.getOwnPropertyNames(on).forEach(fixFalsyProperty);
                on = Object.getPrototypeOf(on);
            }
            return {
                "type": typeof object,
                "properties": properties
            };
        },
        "fapply": function (args) {
            return object.apply(void 0, args);
        },
        "keys": function () {
            return keys(object);
        }
    }, void 0, function valueOf() {
        return object;
    });
}

/**
 * Annotates an object such that it will never be
 * transferred away from this process over any promise
 * communication channel.
 * @param object
 * @returns promise a wrapping of that object that
 * additionally responds to the 'isDef' message
 * without a rejection.
 */
exports.master = master;
function master(object) {
    return makePromise({
        "isDef": function () {}
    }, function fallback(op) {
        var args = Array_slice(arguments);
        return send.apply(void 0, [object].concat(args));
    }, function () {
        return valueOf(object);
    });
}

exports.viewInfo = viewInfo;
function viewInfo(object, info) {
    object = resolve(object);
    if (info) {
        return makePromise({
            "viewInfo": function () {
                return info;
            }
        }, function fallback(op) {
            var args = Array_slice(arguments);
            return send.apply(void 0, [object].concat(args));
        }, function () {
            return valueOf(object);
        });
    } else {
        return send(object, "viewInfo");
    }
}

exports.view = view;
function view(object) {
    return viewInfo(object).when(function (info) {
        var view;
        if (info.type === "function") {
            view = function () {
                return apply(object, void 0, arguments);
            };
        } else {
            view = {};
        }
        var properties = info.properties || {};
        Object_keys(properties).forEach(function (name) {
            if (properties[name] === "function") {
                view[name] = function () {
                    return post(object, name, arguments);
                };
            }
        });
        return resolve(view);
    });
}

/**
 * Registers an observer on a promise.
 *
 * Guarantees:
 *
 * 1. that fulfilled and rejected will be called only once.
 * 2. that either the fulfilled callback or the rejected callback will be
 *    called, but not both.
 * 3. that fulfilled and rejected will not be called in this turn.
 *
 * @param value     promise or immediate reference to observe
 * @param fulfilled function to be called with the fulfilled value
 * @param rejected  function to be called with the rejection exception
 * @return promise for the return value from the invoked callback
 */
exports.when = when;
function when(value, fulfilled, rejected) {
    var deferred = defer();
    var done = false;   // ensure the untrusted promise makes at most a
                        // single call to one of the callbacks

    function _fulfilled(value) {
        try {
            return fulfilled ? fulfilled(value) : value;
        } catch (exception) {
            return reject(exception);
        }
    }

    function _rejected(exception) {
        try {
            return rejected ? rejected(exception) : reject(exception);
        } catch (exception) {
            return reject(exception);
        }
    }

    nextTick(function () {
        resolve(value).promiseSend("when", function (value) {
            if (done) {
                return;
            }
            done = true;
            resolve(value).promiseSend("when", function (value) {
                deferred.resolve(_fulfilled(value));
            }, function (exception) {
                deferred.resolve(_rejected(exception));
            });
        }, function (exception) {
            if (done) {
                return;
            }
            done = true;
            deferred.resolve(_rejected(exception));
        });
    });

    return deferred.promise;
}

exports.spread = spread;
function spread(promise, fulfilled, rejected) {
    return when(promise, function (values) {
        return fulfilled.apply(void 0, values);
    }, rejected);
}

/**
 * The async function is a decorator for generator functions, turning
 * them into asynchronous generators.  This presently only works in
 * Firefox/Spidermonkey, however, this code does not cause syntax
 * errors in older engines.  This code should continue to work and
 * will in fact improve over time as the language improves.
 *
 * Decorates a generator function such that:
 *  - it may yield promises
 *  - execution will continue when that promise is fulfilled
 *  - the value of the yield expression will be the fulfilled value
 *  - it returns a promise for the return value (when the generator
 *    stops iterating)
 *  - the decorated function returns a promise for the return value
 *    of the generator or the first rejected promise among those
 *    yielded.
 *  - if an error is thrown in the generator, it propagates through
 *    every following yield until it is caught, or until it escapes
 *    the generator function altogether, and is translated into a
 *    rejection for the promise returned by the decorated generator.
 *  - in present implementations of generators, when a generator
 *    function is complete, it throws ``StopIteration``, ``return`` is
 *    a syntax error in the presence of ``yield``, so there is no
 *    observable return value. There is a proposal[1] to add support
 *    for ``return``, which would permit the value to be carried by a
 *    ``StopIteration`` instance, in which case it would fulfill the
 *    promise returned by the asynchronous generator.  This can be
 *    emulated today by throwing StopIteration explicitly with a value
 *    property.
 *
 *  [1]: http://wiki.ecmascript.org/doku.php?id=strawman:async_functions#reference_implementation
 *
 */
exports.async = async;
function async(makeGenerator) {
    return function () {
        // when verb is "send", arg is a value
        // when verb is "throw", arg is an exception
        function continuer(verb, arg) {
            var result;
            try {
                result = generator[verb](arg);
            } catch (exception) {
                if (isStopIteration(exception)) {
                    return exception.value;
                } else {
                    return reject(exception);
                }
            }
            return when(result, callback, errback);
        }
        var generator = makeGenerator.apply(this, arguments);
        var callback = continuer.bind(continuer, "send");
        var errback = continuer.bind(continuer, "throw");
        return callback();
    };
}

/**
 * Constructs a promise method that can be used to safely observe resolution of
 * a promise for an arbitrarily named method like "propfind" in a future turn.
 */
exports.sender = sender;
exports.Method = sender; // XXX deprecated
function sender(op) {
    return function (object) {
        var args = Array_slice(arguments, 1);
        return send.apply(void 0, [object, op].concat(args));
    };
}

/**
 * sends a message to a value in a future turn
 * @param object* the recipient
 * @param op the name of the message operation, e.g., "when",
 * @param ...args further arguments to be forwarded to the operation
 * @returns result {Promise} a promise for the result of the operation
 */
exports.send = send;
function send(object, op) {
    var deferred = defer();
    var args = Array_slice(arguments, 2);
    object = resolve(object);
    nextTick(function () {
        object.promiseSend.apply(
            object,
            [op, deferred.resolve].concat(args)
        );
    });
    return deferred.promise;
}

/**
 * sends a message to a value in a future turn
 * @param object* the recipient
 * @param op the name of the message operation, e.g., "when",
 * @param args further arguments to be forwarded to the operation
 * @returns result {Promise} a promise for the result of the operation
 */
exports.dispatch = dispatch;
function dispatch(object, op, args) {
    var deferred = defer();
    object = resolve(object);
    nextTick(function () {
        object.promiseSend.apply(
            object,
            [op, deferred.resolve].concat(args)
        );
    });
    return deferred.promise;
}

/**
 * Constructs a promise method that can be used to safely observe resolution of
 * a promise for an arbitrarily named method like "propfind" in a future turn.
 *
 * "dispatcher" constructs methods like "get(promise, name)" and "put(promise)".
 */
exports.dispatcher = dispatcher;
function dispatcher(op) {
    return function (object) {
        var args = Array_slice(arguments, 1);
        return dispatch(object, op, args);
    };
}
/**
 * Gets the value of a property in a future turn.
 * @param object    promise or immediate reference for target object
 * @param name      name of property to get
 * @return promise for the property value
 */
exports.get = dispatcher("get");

/**
 * Sets the value of a property in a future turn.
 * @param object    promise or immediate reference for object object
 * @param name      name of property to set
 * @param value     new value of property
 * @return promise for the return value
 */
exports.put = dispatcher("put");

/**
 * Deletes a property in a future turn.
 * @param object    promise or immediate reference for target object
 * @param name      name of property to delete
 * @return promise for the return value
 */
exports.del = exports['delete'] = dispatcher("del");

/**
 * Invokes a method in a future turn.
 * @param object    promise or immediate reference for target object
 * @param name      name of method to invoke
 * @param value     a value to post, typically an array of
 *                  invocation arguments for promises that
 *                  are ultimately backed with `resolve` values,
 *                  as opposed to those backed with URLs
 *                  wherein the posted value can be any
 *                  JSON serializable object.
 * @return promise for the return value
 */
var post = exports.post = dispatcher("post");

/**
 * Invokes a method in a future turn.
 * @param object    promise or immediate reference for target object
 * @param name      name of method to invoke
 * @param ...args   array of invocation arguments
 * @return promise for the return value
 */
exports.invoke = function (value, name) {
    var args = Array_slice(arguments, 2);
    return post(value, name, args);
};

/**
 * Applies the promised function in a future turn.
 * @param object    promise or immediate reference for target function
 * @param thisp     the `this` object for the call
 * @param args      array of application arguments
 */
var apply = exports.apply = dispatcher("apply");

/**
 * Applies the promised function in a future turn.
 * @param object    promise or immediate reference for target function
 * @param args      array of application arguments
 */
var fapply = exports.fapply = dispatcher("fapply");

/**
 * Calls the promised function in a future turn.
 * @param object    promise or immediate reference for target function
 * @param thisp     the `this` object for the call
 * @param ...args   array of application arguments
 */
exports.call = call;
function call(value, thisp) {
    var args = Array_slice(arguments, 2);
    return apply(value, thisp, args);
}

/**
 * Calls the promised function in a future turn.
 * @param object    promise or immediate reference for target function
 * @param ...args   array of application arguments
 */
exports.fcall = exports['try'] = fcall;
function fcall(value) {
    var args = Array_slice(arguments, 1);
    return fapply(value, args);
}

/**
 * Binds the promised function, transforming return values into a fulfilled
 * promise and thrown errors into a rejected one.
 * @param object    promise or immediate reference for target function
 * @param thisp   the `this` object for the call
 * @param ...args   array of application arguments
 */
exports.bind = bind;
function bind(value, thisp) {
    var args = Array_slice(arguments, 2);
    return function bound() {
        var allArgs = args.concat(Array_slice(arguments));
        return apply(value, thisp, allArgs);
    };
}

/**
 * Binds the promised function, transforming return values into a fulfilled
 * promise and thrown errors into a rejected one.
 * @param object    promise or immediate reference for target function
 * @param ...args   array of application arguments
 */
exports.fbind = fbind;
function fbind(value) {
    var args = Array_slice(arguments, 1);
    return function fbound() {
        var allArgs = args.concat(Array_slice(arguments));
        return fapply(value, allArgs);
    };
}

/**
 * Requests the names of the owned properties of a promised
 * object in a future turn.
 * @param object    promise or immediate reference for target object
 * @return promise for the keys of the eventually resolved object
 */
exports.keys = dispatcher("keys");

/**
 * Turns an array of promises into a promise for an array.  If any of
 * the promises gets rejected, the whole array is rejected immediately.
 * @param {Array*} an array (or promise for an array) of values (or
 * promises for values)
 * @returns a promise for an array of the corresponding values
 */
// By Mark Miller
// http://wiki.ecmascript.org/doku.php?id=strawman:concurrency&rev=1308776521#allfulfilled
exports.all = all;
function all(promises) {
    return when(promises, function (promises) {
        var countDown = promises.length;
        if (countDown === 0) {
            return resolve(promises);
        }
        var deferred = defer();
        Array_reduce(promises, function (undefined, promise, index) {
            when(promise, function (value) {
                promises[index] = value;
                if (--countDown === 0) {
                    deferred.resolve(promises);
                }
            })
            .fail(deferred.reject);
        }, void 0);
        return deferred.promise;
    });
}

exports.allResolved = allResolved;
function allResolved(promises) {
    return when(promises, function (promises) {
        return when(all(promises.map(function (promise) {
            return when(promise, noop, noop);
        })), function () {
            return promises.map(resolve);
        });
    });
}

/**
 * Captures the failure of a promise, giving an oportunity to recover
 * with a callback.  If the given promise is fulfilled, the returned
 * promise is fulfilled.
 * @param {Any*} promise for something
 * @param {Function} callback to fulfill the returned promise if the
 * given promise is rejected
 * @returns a promise for the return value of the callback
 */
exports['catch'] =
exports.fail = fail;
function fail(promise, rejected) {
    return when(promise, void 0, rejected);
}

/**
 * Provides an opportunity to observe the rejection of a promise,
 * regardless of whether the promise is fulfilled or rejected.  Forwards
 * the resolution to the returned promise when the callback is done.
 * The callback can return a promise to defer completion.
 * @param {Any*} promise
 * @param {Function} callback to observe the resolution of the given
 * promise, takes no arguments.
 * @returns a promise for the resolution of the given promise when
 * ``fin`` is done.
 */
exports['finally'] =
exports.fin = fin;
function fin(promise, callback) {
    return when(promise, function (value) {
        return when(callback(), function () {
            return value;
        });
    }, function (exception) {
        return when(callback(), function () {
            return reject(exception);
        });
    });
}

/**
 * Terminates a chain of promises, forcing rejections to be
 * thrown as exceptions.
 * @param {Any*} promise at the end of a chain of promises
 * @returns nothing
 */
exports.end = end;
function end(promise) {
    when(promise, void 0, function (error) {
        // forward to a future turn so that ``when``
        // does not catch it and turn it into a rejection.
        nextTick(function () {
            throw error;
        });
    });
}

/**
 * Causes a promise to be rejected if it does not get fulfilled before
 * some milliseconds time out.
 * @param {Any*} promise
 * @param {Number} milliseconds timeout
 * @returns a promise for the resolution of the given promise if it is
 * fulfilled before the timeout, otherwise rejected.
 */
exports.timeout = timeout;
function timeout(promise, ms) {
    var deferred = defer();
    when(promise, deferred.resolve, deferred.reject);
    setTimeout(function () {
        deferred.reject(new Error("Timed out after " + ms + "ms"));
    }, ms);
    return deferred.promise;
}

/**
 * Returns a promise for the given value (or promised value) after some
 * milliseconds.
 * @param {Any*} promise
 * @param {Number} milliseconds
 * @returns a promise for the resolution of the given promise after some
 * time has elapsed.
 */
exports.delay = delay;
function delay(promise, timeout) {
    if (timeout === void 0) {
        timeout = promise;
        promise = void 0;
    }
    var deferred = defer();
    setTimeout(function () {
        deferred.resolve(promise);
    }, timeout);
    return deferred.promise;
}

/**
 * Passes a continuation to a Node function, which is called with a given
 * `this` value and arguments provided as an array, and returns a promise.
 *
 *      var FS = require("fs");
 *      Q.napply(FS.readFile, FS, [__filename])
 *      .then(function (content) {
 *      })
 *
 */
exports.napply = napply;
function napply(callback, thisp, args) {
    return nbind(callback).apply(thisp, args);
}

/**
 * Passes a continuation to a Node function, which is called with a given
 * `this` value and arguments provided individually, and returns a promise.
 *
 *      var FS = require("fs");
 *      Q.ncall(FS.readFile, FS, __filename)
 *      .then(function (content) {
 *      })
 *
 */
exports.ncall = ncall;
function ncall(callback, thisp /*, ...args*/) {
    var args = Array_slice(arguments, 2);
    return napply(callback, thisp, args);
}

/**
 * Wraps a NodeJS continuation passing function and returns an equivalent
 * version that returns a promise.
 *
 *      Q.nbind(FS.readFile, FS)(__filename)
 *      .then(console.log)
 *      .end()
 *
 */
exports.nbind = nbind;
function nbind(callback /* thisp, ...args*/) {
    if (arguments.length > 1) {
        var args = Array_slice(arguments, 1);
        callback = callback.bind.apply(callback, args);
    }
    return function () {
        var deferred = defer();
        var args = Array_slice(arguments);
        // add a continuation that resolves the promise
        args.push(deferred.makeNodeResolver());
        // trap exceptions thrown by the callback
        apply(callback, this, args)
        .fail(deferred.reject);
        return deferred.promise;
    };
}

exports.npost = npost;
function npost(object, name, args) {
    return napply(object[name], name, args);
}

exports.ninvoke = ninvoke;
function ninvoke(object, name /*, ...args*/) {
    var args = Array_slice(arguments, 2);
    return napply(object[name], name, args);
}

defend(exports);

});