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- // Copyright (c) 2012, Mark Cavage. All rights reserved.
- // Copyright 2015 Joyent, Inc.
-
- var assert = require('assert');
- var Stream = require('stream').Stream;
- var util = require('util');
-
-
- ///--- Globals
-
- /* JSSTYLED */
- var UUID_REGEXP = /^[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}$/;
-
-
- ///--- Internal
-
- function _capitalize(str) {
- return (str.charAt(0).toUpperCase() + str.slice(1));
- }
-
- function _toss(name, expected, oper, arg, actual) {
- throw new assert.AssertionError({
- message: util.format('%s (%s) is required', name, expected),
- actual: (actual === undefined) ? typeof (arg) : actual(arg),
- expected: expected,
- operator: oper || '===',
- stackStartFunction: _toss.caller
- });
- }
-
- function _getClass(arg) {
- return (Object.prototype.toString.call(arg).slice(8, -1));
- }
-
- function noop() {
- // Why even bother with asserts?
- }
-
-
- ///--- Exports
-
- var types = {
- bool: {
- check: function (arg) { return typeof (arg) === 'boolean'; }
- },
- func: {
- check: function (arg) { return typeof (arg) === 'function'; }
- },
- string: {
- check: function (arg) { return typeof (arg) === 'string'; }
- },
- object: {
- check: function (arg) {
- return typeof (arg) === 'object' && arg !== null;
- }
- },
- number: {
- check: function (arg) {
- return typeof (arg) === 'number' && !isNaN(arg);
- }
- },
- finite: {
- check: function (arg) {
- return typeof (arg) === 'number' && !isNaN(arg) && isFinite(arg);
- }
- },
- buffer: {
- check: function (arg) { return Buffer.isBuffer(arg); },
- operator: 'Buffer.isBuffer'
- },
- array: {
- check: function (arg) { return Array.isArray(arg); },
- operator: 'Array.isArray'
- },
- stream: {
- check: function (arg) { return arg instanceof Stream; },
- operator: 'instanceof',
- actual: _getClass
- },
- date: {
- check: function (arg) { return arg instanceof Date; },
- operator: 'instanceof',
- actual: _getClass
- },
- regexp: {
- check: function (arg) { return arg instanceof RegExp; },
- operator: 'instanceof',
- actual: _getClass
- },
- uuid: {
- check: function (arg) {
- return typeof (arg) === 'string' && UUID_REGEXP.test(arg);
- },
- operator: 'isUUID'
- }
- };
-
- function _setExports(ndebug) {
- var keys = Object.keys(types);
- var out;
-
- /* re-export standard assert */
- if (process.env.NODE_NDEBUG) {
- out = noop;
- } else {
- out = function (arg, msg) {
- if (!arg) {
- _toss(msg, 'true', arg);
- }
- };
- }
-
- /* standard checks */
- keys.forEach(function (k) {
- if (ndebug) {
- out[k] = noop;
- return;
- }
- var type = types[k];
- out[k] = function (arg, msg) {
- if (!type.check(arg)) {
- _toss(msg, k, type.operator, arg, type.actual);
- }
- };
- });
-
- /* optional checks */
- keys.forEach(function (k) {
- var name = 'optional' + _capitalize(k);
- if (ndebug) {
- out[name] = noop;
- return;
- }
- var type = types[k];
- out[name] = function (arg, msg) {
- if (arg === undefined || arg === null) {
- return;
- }
- if (!type.check(arg)) {
- _toss(msg, k, type.operator, arg, type.actual);
- }
- };
- });
-
- /* arrayOf checks */
- keys.forEach(function (k) {
- var name = 'arrayOf' + _capitalize(k);
- if (ndebug) {
- out[name] = noop;
- return;
- }
- var type = types[k];
- var expected = '[' + k + ']';
- out[name] = function (arg, msg) {
- if (!Array.isArray(arg)) {
- _toss(msg, expected, type.operator, arg, type.actual);
- }
- var i;
- for (i = 0; i < arg.length; i++) {
- if (!type.check(arg[i])) {
- _toss(msg, expected, type.operator, arg, type.actual);
- }
- }
- };
- });
-
- /* optionalArrayOf checks */
- keys.forEach(function (k) {
- var name = 'optionalArrayOf' + _capitalize(k);
- if (ndebug) {
- out[name] = noop;
- return;
- }
- var type = types[k];
- var expected = '[' + k + ']';
- out[name] = function (arg, msg) {
- if (arg === undefined || arg === null) {
- return;
- }
- if (!Array.isArray(arg)) {
- _toss(msg, expected, type.operator, arg, type.actual);
- }
- var i;
- for (i = 0; i < arg.length; i++) {
- if (!type.check(arg[i])) {
- _toss(msg, expected, type.operator, arg, type.actual);
- }
- }
- };
- });
-
- /* re-export built-in assertions */
- Object.keys(assert).forEach(function (k) {
- if (k === 'AssertionError') {
- out[k] = assert[k];
- return;
- }
- if (ndebug) {
- out[k] = noop;
- return;
- }
- out[k] = assert[k];
- });
-
- /* export ourselves (for unit tests _only_) */
- out._setExports = _setExports;
-
- return out;
- }
-
- module.exports = _setExports(process.env.NODE_NDEBUG);
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