87 lines
2.3 KiB
JavaScript
87 lines
2.3 KiB
JavaScript
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/*!
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* Copyright(c) 2011 Einar Otto Stangvik <einaros@gmail.com>
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* MIT Licensed
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*/
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var fs = require('fs');
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function Options(defaults) {
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var internalValues = {};
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var values = this.value = {};
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Object.keys(defaults).forEach(function(key) {
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internalValues[key] = defaults[key];
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Object.defineProperty(values, key, {
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get: function() { return internalValues[key]; },
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configurable: false,
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enumerable: true
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});
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});
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this.reset = function() {
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Object.keys(defaults).forEach(function(key) {
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internalValues[key] = defaults[key];
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});
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return this;
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};
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this.merge = function(options, required) {
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options = options || {};
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if (Object.prototype.toString.call(required) === '[object Array]') {
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var missing = [];
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for (var i = 0, l = required.length; i < l; ++i) {
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var key = required[i];
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if (!(key in options)) {
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missing.push(key);
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}
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}
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if (missing.length > 0) {
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if (missing.length > 1) {
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throw new Error('options ' +
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missing.slice(0, missing.length - 1).join(', ') + ' and ' +
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missing[missing.length - 1] + ' must be defined');
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}
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else throw new Error('option ' + missing[0] + ' must be defined');
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}
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}
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Object.keys(options).forEach(function(key) {
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if (key in internalValues) {
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internalValues[key] = options[key];
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}
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});
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return this;
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};
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this.copy = function(keys) {
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var obj = {};
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Object.keys(defaults).forEach(function(key) {
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if (keys.indexOf(key) !== -1) {
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obj[key] = values[key];
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}
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});
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return obj;
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};
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this.read = function(filename, cb) {
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if (typeof cb == 'function') {
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var self = this;
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fs.readFile(filename, function(error, data) {
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if (error) return cb(error);
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var conf = JSON.parse(data);
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self.merge(conf);
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cb();
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});
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}
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else {
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var conf = JSON.parse(fs.readFileSync(filename));
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this.merge(conf);
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}
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return this;
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};
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this.isDefined = function(key) {
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return typeof values[key] != 'undefined';
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};
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this.isDefinedAndNonNull = function(key) {
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return typeof values[key] != 'undefined' && values[key] !== null;
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};
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Object.freeze(values);
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Object.freeze(this);
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}
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module.exports = Options;
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