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index.js
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index.js
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'use strict';
var utils = require('./utils');
/**
* Create an instance of `Settings` with the given `options`.
*
* ```js
* var settings = new Settings();
* ```
* @param {Object} `options`
* @api public
*/
function Settings(options) {
this.options = options || {};
this.configs = [];
this.cache = {};
}
/**
* Normalize the given object with the user-defined
* `options.normalize` function, or return the object unchanged
* if `options.normalize` is not defined.
*
* @param {Object} `config` The object to normalize.
*/
Settings.prototype.normalize = function(config) {
if (typeof this.options.normalize === 'function') {
return this.options.normalize(config);
}
return config;
};
/**
* Add a `config` object to be merged.
*
* ```js
* config
* .addConfig({a: 'b', c: 'd'})
* .addConfig({a: 'z'})
* .merge();
*
* //=> {a: 'z', c: 'd'}
* ```
*
* @param {Object} `object` The object to merge into the config.
* @api public
*/
Settings.prototype.set = function(key, config) {
if (typeof key !== 'string') {
return this.addConfig.apply(this, arguments);
}
this.configs.push(config);
utils.set(this.cache, key, config);
return this;
};
/**
* Get the normalized value of property `key` from the cache.
*
* ```js
* config.get('foo');
* ```
* @param {String} `key`
* @return {any} The normalized value of `key`
* @api public
*/
Settings.prototype.get = function(key) {
return this.normalize(utils.get(this.cache, key));
};
/**
* Get the raw (non-normalized) value of property `key` from the cache.
*
* ```js
* config.get('foo');
* ```
* @param {String} `key`
* @return {any} The value of `key`
* @api public
*/
Settings.prototype.getRaw = function(key) {
return utils.get(this.cache, key);
};
/**
* Add a `config` object to be merged.
*
* ```js
* config
* .addConfig({a: 'b', c: 'd'})
* .addConfig({a: 'z'})
* .merge();
*
* //=> {a: 'z', c: 'd'}
* ```
*
* @param {Object} `object` The object to merge into the config.
* @api public
*/
Settings.prototype.addConfig = function(config) {
if (typeof config === 'string') {
return this.set.apply(this, arguments);
}
if (Array.isArray(config) || arguments.length > 1) {
return this.addConfigs.apply(this, arguments);
}
this.configs.push(config);
return this;
};
/**
* Add an array or list of `config` objects to be merged.
*
* ```js
* config
* .addConfigs({a: 'b'}, {c: 'd'})
* .addConfigs([{a: 'b'}, {c: 'd'}])
* ```
*
* @param {Object} `object` The object to merge into the config.
* @api public
*/
Settings.prototype.addConfigs = function(config) {
var args = utils.flatten([].slice.call(arguments));
var len = args.length;
var idx = -1;
while (++idx < len) {
this.addConfig(args[idx]);
}
return this;
};
/**
* Merge the given (optional) `config` object with cached config objects
* in the order in which the objects were defined. If a `normalize` function
* is passed on the contructor options, or as the first or second argument
* to `.merge`, it will be used on each config object before merging it onto
* the results object.
*
* ```js
* var settings = new Settings()
* .set('foo', {a: 'b'})
* .set('bar', {c: 'd'})
* .set('baz', {e: 'f'})
* .merge();
*
* console.log(settings);
* //=> {a: 'b', c: 'd', e: 'f'}
*
* // Pass a normalize function on the
* // ctor options, or to .merge as first or second arg
* var settings = new Settings()
* .set('foo', {a: 'b'})
* .set('bar', {c: 'd'})
* .set('baz', {e: 'f'})
* .merge(function(config) {
* // normalize config object
* });
*
* console.log(settings);
* //=>
* ```
* @param {Object} `config`
* @api public
*/
Settings.prototype.merge = function(config) {
var fn = this.normalize.bind(this);
if (typeof config === 'function') {
fn = config.bind(this);
config = null;
}
if (config) this.addConfig.apply(this, arguments);
var len = this.configs.length;
var idx = -1;
var res = {};
while (++idx < len) {
var obj = fn(this.configs[idx]);
for (var key in obj) {
if (obj.hasOwnProperty(key)) {
var val = obj[key];
if (utils.isObject(val)) {
res[key] = utils.merge({}, res[key], val);
continue;
}
if (Array.isArray(val) && val.length) {
if (!Array.isArray(res[key])) {
res[key] = val;
} else {
res[key] = utils.union([], res[key], val);
}
continue;
}
if (typeof val === 'string' || typeof val === 'boolean') {
res[key] = val;
}
}
}
utils.merge(res, obj);
}
return res;
};
/**
* Export `Settings`
*
* @type {Object}
*/
module.exports = Settings;