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211 lines (188 loc) · 5.33 KB
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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);