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