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Diffstat (limited to 'tools/addon-sdk-1.12/lib/sdk/deprecated/traits.js')
-rw-r--r-- | tools/addon-sdk-1.12/lib/sdk/deprecated/traits.js | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/tools/addon-sdk-1.12/lib/sdk/deprecated/traits.js b/tools/addon-sdk-1.12/lib/sdk/deprecated/traits.js new file mode 100644 index 0000000..30ae342 --- /dev/null +++ b/tools/addon-sdk-1.12/lib/sdk/deprecated/traits.js @@ -0,0 +1,187 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +"use strict"; + +module.metadata = { + "stability": "deprecated" +}; + +const { + compose: _compose, + override: _override, + resolve: _resolve, + trait: _trait, + //create: _create, + required, +} = require('./traits/core'); + +const defineProperties = Object.defineProperties, + freeze = Object.freeze, + create = Object.create; + +/** + * Work around bug 608959 by defining the _create function here instead of + * importing it from traits/core. For docs on this function, see the create + * function in that module. + * + * FIXME: remove this workaround in favor of importing the function once that + * bug has been fixed. + */ +function _create(proto, trait) { + let properties = {}, + keys = Object.getOwnPropertyNames(trait); + for each(let key in keys) { + let descriptor = trait[key]; + if (descriptor.required && + !Object.prototype.hasOwnProperty.call(proto, key)) + throw new Error('Missing required property: ' + key); + else if (descriptor.conflict) + throw new Error('Remaining conflicting property: ' + key); + else + properties[key] = descriptor; + } + return Object.create(proto, properties); +} + +/** + * Placeholder for `Trait.prototype` + */ +let TraitProto = Object.prototype; + +function Get(key) this[key] +function Set(key, value) this[key] = value + +/** + * Creates anonymous trait descriptor from the passed argument, unless argument + * is a trait constructor. In later case trait's already existing properties + * descriptor is returned. + * This is module's internal function and is used as a gateway to a trait's + * internal properties descriptor. + * @param {Function} $ + * Composed trait's constructor. + * @returns {Object} + * Private trait property of the composition. + */ +function TraitDescriptor(object) + ( + 'function' == typeof object && + (object.prototype == TraitProto || object.prototype instanceof Trait) + ) ? object._trait(TraitDescriptor) : _trait(object) + +function Public(instance, trait) { + let result = {}, + keys = Object.getOwnPropertyNames(trait); + for each (let key in keys) { + if ('_' === key.charAt(0) && '__iterator__' !== key ) + continue; + let property = trait[key], + descriptor = { + configurable: property.configurable, + enumerable: property.enumerable + }; + if (property.get) + descriptor.get = property.get.bind(instance); + if (property.set) + descriptor.set = property.set.bind(instance); + if ('value' in property) { + let value = property.value; + if ('function' === typeof value) { + descriptor.value = property.value.bind(instance); + descriptor.writable = property.writable; + } else { + descriptor.get = Get.bind(instance, key); + descriptor.set = Set.bind(instance, key); + } + } + result[key] = descriptor; + } + return result; +} + +/** + * This is private function that composes new trait with privates. + */ +function Composition(trait) { + function Trait() { + let self = _create({}, trait); + self._public = create(Trait.prototype, Public(self, trait)); + delete self._public.constructor; + if (Object === self.constructor) + self.constructor = Trait; + else + return self.constructor.apply(self, arguments) || self._public; + return self._public; + } + defineProperties(Trait, { + prototype: { value: freeze(create(TraitProto, { + constructor: { value: constructor, writable: true } + }))}, // writable is `true` to avoid getters in custom ES5 + displayName: { value: (trait.constructor || constructor).name }, + compose: { value: compose, enumerable: true }, + override: { value: override, enumerable: true }, + resolve: { value: resolve, enumerable: true }, + required: { value: required, enumerable: true }, + _trait: { value: function _trait(caller) + caller === TraitDescriptor ? trait : undefined + } + }); + return freeze(Trait); +} + +/** + * Composes new trait out of itself and traits / property maps passed as an + * arguments. If two or more traits / property maps have properties with the + * same name, the new trait will contain a "conflict" property for that name. + * This is a commutative and associative operation, and the order of its + * arguments is not significant. + * @params {Object|Function} + * List of Traits or property maps to create traits from. + * @returns {Function} + * New trait containing the combined properties of all the traits. + */ +function compose() { + let traits = Array.slice(arguments, 0); + traits.push(this); + return Composition(_compose.apply(null, traits.map(TraitDescriptor))); +} + +/** + * Composes a new trait with all of the combined properties of `this` and the + * argument traits. In contrast to `compose`, `override` immediately resolves + * all conflicts resulting from this composition by overriding the properties of + * later traits. Trait priority is from left to right. I.e. the properties of + * the leftmost trait are never overridden. + * @params {Object} trait + * @returns {Object} + */ +function override() { + let traits = Array.slice(arguments, 0); + traits.push(this); + return Composition(_override.apply(null, traits.map(TraitDescriptor))); +} + +/** + * Composes new resolved trait, with all the same properties as this + * trait, except that all properties whose name is an own property of + * `resolutions` will be renamed to `resolutions[name]`. If it is + * `resolutions[name]` is `null` value is changed into a required property + * descriptor. + */ +function resolve(resolutions) + Composition(_resolve(resolutions, TraitDescriptor(this))) + +/** + * Base Trait, that all the traits are composed of. + */ +const Trait = Composition({ + /** + * Internal property holding public API of this instance. + */ + _public: { value: null, configurable: true, writable: true }, + toString: { value: function() '[object ' + this.constructor.name + ']' } +}); +TraitProto = Trait.prototype; +exports.Trait = Trait; + |