commit

node_modules/bluebird/js/main/using.js

@@ -0,0 +1,213 @@
+"use strict";
+module.exports = function (Promise, apiRejection, tryConvertToPromise,
+    createContext) {
+    var TypeError = require("./errors.js").TypeError;
+    var inherits = require("./util.js").inherits;
+    var PromiseInspection = Promise.PromiseInspection;
+
+    function inspectionMapper(inspections) {
+        var len = inspections.length;
+        for (var i = 0; i < len; ++i) {
+            var inspection = inspections[i];
+            if (inspection.isRejected()) {
+                return Promise.reject(inspection.error());
+            }
+            inspections[i] = inspection._settledValue;
+        }
+        return inspections;
+    }
+
+    function thrower(e) {
+        setTimeout(function(){throw e;}, 0);
+    }
+
+    function castPreservingDisposable(thenable) {
+        var maybePromise = tryConvertToPromise(thenable);
+        if (maybePromise !== thenable &&
+            typeof thenable._isDisposable === "function" &&
+            typeof thenable._getDisposer === "function" &&
+            thenable._isDisposable()) {
+            maybePromise._setDisposable(thenable._getDisposer());
+        }
+        return maybePromise;
+    }
+    function dispose(resources, inspection) {
+        var i = 0;
+        var len = resources.length;
+        var ret = Promise.defer();
+        function iterator() {
+            if (i >= len) return ret.resolve();
+            var maybePromise = castPreservingDisposable(resources[i++]);
+            if (maybePromise instanceof Promise &&
+                maybePromise._isDisposable()) {
+                try {
+                    maybePromise = tryConvertToPromise(
+                        maybePromise._getDisposer().tryDispose(inspection),
+                        resources.promise);
+                } catch (e) {
+                    return thrower(e);
+                }
+                if (maybePromise instanceof Promise) {
+                    return maybePromise._then(iterator, thrower,
+                                              null, null, null);
+                }
+            }
+            iterator();
+        }
+        iterator();
+        return ret.promise;
+    }
+
+    function disposerSuccess(value) {
+        var inspection = new PromiseInspection();
+        inspection._settledValue = value;
+        inspection._bitField = 268435456;
+        return dispose(this, inspection).thenReturn(value);
+    }
+
+    function disposerFail(reason) {
+        var inspection = new PromiseInspection();
+        inspection._settledValue = reason;
+        inspection._bitField = 134217728;
+        return dispose(this, inspection).thenThrow(reason);
+    }
+
+    function Disposer(data, promise, context) {
+        this._data = data;
+        this._promise = promise;
+        this._context = context;
+    }
+
+    Disposer.prototype.data = function () {
+        return this._data;
+    };
+
+    Disposer.prototype.promise = function () {
+        return this._promise;
+    };
+
+    Disposer.prototype.resource = function () {
+        if (this.promise().isFulfilled()) {
+            return this.promise().value();
+        }
+        return null;
+    };
+
+    Disposer.prototype.tryDispose = function(inspection) {
+        var resource = this.resource();
+        var context = this._context;
+        if (context !== undefined) context._pushContext();
+        var ret = resource !== null
+            ? this.doDispose(resource, inspection) : null;
+        if (context !== undefined) context._popContext();
+        this._promise._unsetDisposable();
+        this._data = null;
+        return ret;
+    };
+
+    Disposer.isDisposer = function (d) {
+        return (d != null &&
+                typeof d.resource === "function" &&
+                typeof d.tryDispose === "function");
+    };
+
+    function FunctionDisposer(fn, promise, context) {
+        this.constructor$(fn, promise, context);
+    }
+    inherits(FunctionDisposer, Disposer);
+
+    FunctionDisposer.prototype.doDispose = function (resource, inspection) {
+        var fn = this.data();
+        return fn.call(resource, resource, inspection);
+    };
+
+    function maybeUnwrapDisposer(value) {
+        if (Disposer.isDisposer(value)) {
+            this.resources[this.index]._setDisposable(value);
+            return value.promise();
+        }
+        return value;
+    }
+
+    Promise.using = function () {
+        var len = arguments.length;
+        if (len < 2) return apiRejection(
+                        "you must pass at least 2 arguments to Promise.using");
+        var fn = arguments[len - 1];
+        if (typeof fn !== "function") return apiRejection("fn must be a function\u000a\u000a    See http://goo.gl/916lJJ\u000a");
+
+        var input;
+        var spreadArgs = true;
+        if (len === 2 && Array.isArray(arguments[0])) {
+            input = arguments[0];
+            len = input.length;
+            spreadArgs = false;
+        } else {
+            input = arguments;
+            len--;
+        }
+        var resources = new Array(len);
+        for (var i = 0; i < len; ++i) {
+            var resource = input[i];
+            if (Disposer.isDisposer(resource)) {
+                var disposer = resource;
+                resource = resource.promise();
+                resource._setDisposable(disposer);
+            } else {
+                var maybePromise = tryConvertToPromise(resource);
+                if (maybePromise instanceof Promise) {
+                    resource =
+                        maybePromise._then(maybeUnwrapDisposer, null, null, {
+                            resources: resources,
+                            index: i
+                    }, undefined);
+                }
+            }
+            resources[i] = resource;
+        }
+
+        var promise = Promise.settle(resources)
+            .then(inspectionMapper)
+            .then(function(vals) {
+                promise._pushContext();
+                var ret;
+                try {
+                    ret = spreadArgs
+                        ? fn.apply(undefined, vals) : fn.call(undefined,  vals);
+                } finally {
+                    promise._popContext();
+                }
+                return ret;
+            })
+            ._then(
+                disposerSuccess, disposerFail, undefined, resources, undefined);
+        resources.promise = promise;
+        return promise;
+    };
+
+    Promise.prototype._setDisposable = function (disposer) {
+        this._bitField = this._bitField | 262144;
+        this._disposer = disposer;
+    };
+
+    Promise.prototype._isDisposable = function () {
+        return (this._bitField & 262144) > 0;
+    };
+
+    Promise.prototype._getDisposer = function () {
+        return this._disposer;
+    };
+
+    Promise.prototype._unsetDisposable = function () {
+        this._bitField = this._bitField & (~262144);
+        this._disposer = undefined;
+    };
+
+    Promise.prototype.disposer = function (fn) {
+        if (typeof fn === "function") {
+            return new FunctionDisposer(fn, this, createContext());
+        }
+        throw new TypeError();
+    };
+
+};