Flexible whitelist/blacklist testing

Synopsis

var TestLists = require('test-list');
var lists = new TestLists(whitelist, blacklist);
var passed = lists.test(string);

Lists

Lists may be:

• an array — elements that are not already strings or RegExp objects are converted to strings
• a RegExp — converted to a single-element array
• a string — converted to a single-element array
• an object — converted to array comprised of the keys of the object's enumerable members that have defined values
• undefined — a no-op

Test

The single defined method, test(string), returns a boolean subject to the following conditions:

1. If whitelist is defined, the test string must match one of its elements.
2. If blacklist is defined, the test string must not match any of its elements.

Examples

var lists = new TestLists(['abc','de','f']);
lists.test('abc') // true: whitelisted and no blacklist
lists.test('ab') // false: not in whitelist
lists.test('de') // true: whitelisted and no blacklist
lists.test('f') // true: whitelisted and no blacklist
lists.test('g') // false: not in whitelist

var threeOrMore = /^[a-z]{3}$/;
var lists = new TestLists(undefined, [threeOrMore, 'f']);
lists.test('abc') // false: no whitelist but strings of length 3 or more are blacklisted
lists.test('ab') // true: no whitelist and not blacklisted
lists.test('de') // true: no whitelist and not blacklisted
lists.test('f') // false: no whitelist but blacklisted
lists.test('g') // true: no whitelist and not blacklisted

var lists = new TestLists(['abc','de','f'], [threeOrMore, 'f']);
lists.test('abc') // false: whitelisted but strings of length 3 or more are blacklisted
lists.test('ab') // false: not in whitelist
lists.test('de') // true: whitelisted and not blacklisted
lists.test('f') // false: whitelisted but blacklisted
lists.test('g') // false: not in whitelist