158 lines
3.0 KiB
JavaScript
158 lines
3.0 KiB
JavaScript
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/**
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* Expose `Delegator`.
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*/
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module.exports = Delegator;
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/**
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* Initialize a delegator.
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*
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* @param {Object} proto
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* @param {String} target
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* @api public
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*/
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function Delegator(proto, target) {
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if (!(this instanceof Delegator)) return new Delegator(proto, target);
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this.proto = proto;
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this.target = target;
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this.methods = [];
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this.getters = [];
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this.setters = [];
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this.fluents = [];
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}
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/**
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* Automatically delegate properties
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* from a target prototype
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*
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* @param {Object} proto
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* @param {object} targetProto
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* @param {String} targetProp
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* @api public
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*/
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Delegator.auto = function(proto, targetProto, targetProp) {
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let delegator = Delegator(proto, targetProp);
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let properties = Object.getOwnPropertyNames(targetProto);
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for (let i = 0; i < properties.length; i++) {
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let property = properties[i];
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let descriptor = Object.getOwnPropertyDescriptor(targetProto, property);
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if (descriptor.get) {
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delegator.getter(property);
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}
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if (descriptor.set) {
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delegator.setter(property);
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}
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if (descriptor.hasOwnProperty('value')) { // could be undefined but writable
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let value = descriptor.value;
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if (value instanceof Function) {
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delegator.method(property);
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} else {
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delegator.getter(property);
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}
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if (descriptor.writable) {
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delegator.setter(property);
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}
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}
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}
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};
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/**
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* Delegate method `name`.
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*
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* @param {String} name
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* @return {Delegator} self
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* @api public
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*/
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Delegator.prototype.method = function(name) {
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let proto = this.proto;
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let target = this.target;
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this.methods.push(name);
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proto[name] = function() {
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return this[target][name].apply(this[target], arguments);
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};
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return this;
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};
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/**
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* Delegator accessor `name`.
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*
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* @param {String} name
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* @return {Delegator} self
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* @api public
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*/
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Delegator.prototype.access = function(name) {
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return this.getter(name).setter(name);
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};
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/**
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* Delegator getter `name`.
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*
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* @param {String} name
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* @return {Delegator} self
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* @api public
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*/
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Delegator.prototype.getter = function(name) {
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let proto = this.proto;
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let target = this.target;
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this.getters.push(name);
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proto.__defineGetter__(name, function() {
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return this[target][name];
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});
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return this;
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};
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/**
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* Delegator setter `name`.
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*
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* @param {String} name
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* @return {Delegator} self
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* @api public
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*/
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Delegator.prototype.setter = function(name) {
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let proto = this.proto;
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let target = this.target;
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this.setters.push(name);
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proto.__defineSetter__(name, function(val) {
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return this[target][name] = val;
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});
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return this;
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};
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/**
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* Delegator fluent accessor
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*
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* @param {String} name
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* @return {Delegator} self
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* @api public
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*/
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Delegator.prototype.fluent = function(name) {
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let proto = this.proto;
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let target = this.target;
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this.fluents.push(name);
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proto[name] = function(val) {
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if ('undefined' != typeof val) {
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this[target][name] = val;
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return this;
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} else {
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return this[target][name];
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}
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};
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return this;
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};
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