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* assertion-error
* Copyright(c) 2013 Jake Luer <jake@qualiancy.com>
* MIT Licensed
*/
/*!
* Return a function that will copy properties from
* one object to another excluding any originally
* listed. Returned function will create a new `{}`.
*
* @param {String} excluded properties ...
* @return {Function}
*/
function exclude () {
var excludes = [].slice.call(arguments);
function excludeProps (res, obj) {
Object.keys(obj).forEach(function (key) {
if (!~excludes.indexOf(key)) res[key] = obj[key];
});
}
return function extendExclude () {
var args = [].slice.call(arguments)
, i = 0
, res = {};
for (; i < args.length; i++) {
excludeProps(res, args[i]);
}
return res;
};
};
/*!
* Primary Exports
*/
module.exports = AssertionError;
/**
* ### AssertionError
*
* An extension of the JavaScript `Error` constructor for
* assertion and validation scenarios.
*
* @param {String} message
* @param {Object} properties to include (optional)
* @param {callee} start stack function (optional)
*/
function AssertionError (message, _props, ssf) {
var extend = exclude('name', 'message', 'stack', 'constructor', 'toJSON')
, props = extend(_props || {});
// default values
this.message = message || 'Unspecified AssertionError';
this.showDiff = false;
// copy from properties
for (var key in props) {
this[key] = props[key];
}
// capture stack trace
ssf = ssf || AssertionError;
if (Error.captureStackTrace) {
Error.captureStackTrace(this, ssf);
} else {
try {
throw new Error();
} catch(e) {
this.stack = e.stack;
}
}
}
/*!
* Inherit from Error.prototype
*/
AssertionError.prototype = Object.create(Error.prototype);
/*!
* Statically set name
*/
AssertionError.prototype.name = 'AssertionError';
/*!
* Ensure correct constructor
*/
AssertionError.prototype.constructor = AssertionError;
/**
* Allow errors to be converted to JSON for static transfer.
*
* @param {Boolean} include stack (default: `true`)
* @return {Object} object that can be `JSON.stringify`
*/
AssertionError.prototype.toJSON = function (stack) {
var extend = exclude('constructor', 'toJSON', 'stack')
, props = extend({ name: this.name }, this);
// include stack if exists and not turned off
if (false !== stack && this.stack) {
props.stack = this.stack;
}
return props;
};
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