define-state/index.js

Define stateful property on an object

/**
 * Define stateful property on an object
 */
module.exports = defineState;

var State = require('st8');
	State.ENTER = 'before'
	State.EXIT = 'after'

/**
 * Define stateful property on a target
 *
 * @param {object} target Any object
 * @param {string} property Property name
 * @param {object} descriptor State descriptor
 *
 * @return {object} target
 */
function defineState (target, property, descriptor, isFn) {
	//define accessor on a target
	if (isFn) {
		target[property] = function () {
			if (arguments.length) {
				return state.set(arguments[0]);
			}
			else {
				return state.get();
			}
		};
	}

	//define setter/getter on a target
	else {
		Object.defineProperty(target, property, {
			set: function (value) {
				return state.set(value);
			},
			get: function () {
				return state.get();
			}
		});
	}

	//define state controller
	var state = new State(descriptor, target);

	return target;
}