cscg24-guacamole

CSCG 2024 Challenge 'Guacamole Mashup'
git clone https://git.sinitax.com/sinitax/cscg24-guacamole
Log | Files | Refs | sfeed.txt

options.js (2330B)

      1/*!
      2 * Copyright(c) 2011 Einar Otto Stangvik <einaros@gmail.com>
      3 * MIT Licensed
      4 */
      5
      6var fs = require('fs');
      7
      8function Options(defaults) {
      9  var internalValues = {};
     10  var values = this.value = {};
     11  Object.keys(defaults).forEach(function(key) {
     12    internalValues[key] = defaults[key];
     13    Object.defineProperty(values, key, {
     14      get: function() { return internalValues[key]; },
     15      configurable: false,
     16      enumerable: true
     17    });
     18  });
     19  this.reset = function() {
     20    Object.keys(defaults).forEach(function(key) {
     21      internalValues[key] = defaults[key];
     22    });
     23    return this;
     24  };
     25  this.merge = function(options, required) {
     26    options = options || {};
     27    if (Object.prototype.toString.call(required) === '[object Array]') {
     28      var missing = [];
     29      for (var i = 0, l = required.length; i < l; ++i) {
     30        var key = required[i];
     31        if (!(key in options)) {
     32          missing.push(key);
     33        }
     34      }
     35      if (missing.length > 0) {
     36        if (missing.length > 1) {
     37          throw new Error('options ' +
     38            missing.slice(0, missing.length - 1).join(', ') + ' and ' +
     39            missing[missing.length - 1] + ' must be defined');
     40        }
     41        else throw new Error('option ' + missing[0] + ' must be defined');
     42      }
     43    }
     44    Object.keys(options).forEach(function(key) {
     45      if (key in internalValues) {
     46        internalValues[key] = options[key];
     47      }
     48    });
     49    return this;
     50  };
     51  this.copy = function(keys) {
     52    var obj = {};
     53    Object.keys(defaults).forEach(function(key) {
     54      if (keys.indexOf(key) !== -1) {
     55        obj[key] = values[key];
     56      }
     57    });
     58    return obj;
     59  };
     60  this.read = function(filename, cb) {
     61    if (typeof cb == 'function') {
     62      var self = this;
     63      fs.readFile(filename, function(error, data) {
     64        if (error) return cb(error);
     65        var conf = JSON.parse(data);
     66        self.merge(conf);
     67        cb();
     68      });
     69    }
     70    else {
     71      var conf = JSON.parse(fs.readFileSync(filename));
     72      this.merge(conf);
     73    }
     74    return this;
     75  };
     76  this.isDefined = function(key) {
     77    return typeof values[key] != 'undefined';
     78  };
     79  this.isDefinedAndNonNull = function(key) {
     80    return typeof values[key] != 'undefined' && values[key] !== null;
     81  };
     82  Object.freeze(values);
     83  Object.freeze(this);
     84}
     85
     86module.exports = Options;