83 lines
2.0 KiB
JavaScript
83 lines
2.0 KiB
JavaScript
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/*!
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* randomatic <https://github.com/jonschlinkert/randomatic>
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*
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* Copyright (c) 2014-2017, Jon Schlinkert.
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* Released under the MIT License.
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*/
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'use strict';
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var isNumber = require('is-number');
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var typeOf = require('kind-of');
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/**
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* Expose `randomatic`
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*/
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module.exports = randomatic;
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/**
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* Available mask characters
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*/
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var type = {
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lower: 'abcdefghijklmnopqrstuvwxyz',
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upper: 'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
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number: '0123456789',
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special: '~!@#$%^&()_+-={}[];\',.'
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};
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type.all = type.lower + type.upper + type.number + type.special;
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/**
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* Generate random character sequences of a specified `length`,
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* based on the given `pattern`.
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*
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* @param {String} `pattern` The pattern to use for generating the random string.
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* @param {String} `length` The length of the string to generate.
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* @param {String} `options`
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* @return {String}
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* @api public
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*/
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function randomatic(pattern, length, options) {
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if (typeof pattern === 'undefined') {
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throw new Error('randomatic expects a string or number.');
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}
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var custom = false;
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if (arguments.length === 1) {
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if (typeof pattern === 'string') {
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length = pattern.length;
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} else if (isNumber(pattern)) {
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options = {}; length = pattern; pattern = '*';
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}
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}
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if (typeOf(length) === 'object' && length.hasOwnProperty('chars')) {
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options = length;
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pattern = options.chars;
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length = pattern.length;
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custom = true;
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}
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var opts = options || {};
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var mask = '';
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var res = '';
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// Characters to be used
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if (pattern.indexOf('?') !== -1) mask += opts.chars;
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if (pattern.indexOf('a') !== -1) mask += type.lower;
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if (pattern.indexOf('A') !== -1) mask += type.upper;
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if (pattern.indexOf('0') !== -1) mask += type.number;
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if (pattern.indexOf('!') !== -1) mask += type.special;
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if (pattern.indexOf('*') !== -1) mask += type.all;
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if (custom) mask += pattern;
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while (length--) {
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res += mask.charAt(parseInt(Math.random() * mask.length, 10));
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}
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return res;
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};
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