// Copyright © 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) && 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);