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/*
* verror.js: richer JavaScript errors
*/
var mod_assert = require('assert');
var mod_util = require('util');
var mod_extsprintf = require('extsprintf');
/*
* Public interface
*/
exports.VError = VError;
exports.WError = WError;
exports.MultiError = MultiError;
/*
* Like JavaScript's built-in Error class, but supports a "cause" argument and a
* printf-style message. The cause argument can be null.
*/
function VError(options)
{
var args, causedBy, ctor, tailmsg;
if (options instanceof Error || typeof (options) === 'object') {
args = Array.prototype.slice.call(arguments, 1);
} else {
args = Array.prototype.slice.call(arguments, 0);
options = undefined;
}
tailmsg = args.length > 0 ?
mod_extsprintf.sprintf.apply(null, args) : '';
this.jse_shortmsg = tailmsg;
this.jse_summary = tailmsg;
if (options) {
causedBy = options.cause;
if (!causedBy || !(options.cause instanceof Error))
causedBy = options;
if (causedBy && (causedBy instanceof Error)) {
this.jse_cause = causedBy;
this.jse_summary += ': ' + causedBy.message;
}
}
this.message = this.jse_summary;
Error.call(this, this.jse_summary);
if (Error.captureStackTrace) {
ctor = options ? options.constructorOpt : undefined;
ctor = ctor || arguments.callee;
Error.captureStackTrace(this, ctor);
}
}
mod_util.inherits(VError, Error);
VError.prototype.name = 'VError';
VError.prototype.toString = function ve_toString()
{
var str = (this.hasOwnProperty('name') && this.name ||
this.constructor.name || this.constructor.prototype.name);
if (this.message)
str += ': ' + this.message;
return (str);
};
VError.prototype.cause = function ve_cause()
{
return (this.jse_cause);
};
/*
* Represents a collection of errors for the purpose of consumers that generally
* only deal with one error. Callers can extract the individual errors
* contained in this object, but may also just treat it as a normal single
* error, in which case a summary message will be printed.
*/
function MultiError(errors)
{
mod_assert.ok(errors.length > 0);
this.ase_errors = errors;
VError.call(this, errors[0], 'first of %d error%s',
errors.length, errors.length == 1 ? '' : 's');
}
mod_util.inherits(MultiError, VError);
/*
* Like JavaScript's built-in Error class, but supports a "cause" argument which
* is wrapped, not "folded in" as with VError. Accepts a printf-style message.
* The cause argument can be null.
*/
function WError(options)
{
Error.call(this);
var args, cause, ctor;
if (typeof (options) === 'object') {
args = Array.prototype.slice.call(arguments, 1);
} else {
args = Array.prototype.slice.call(arguments, 0);
options = undefined;
}
if (args.length > 0) {
this.message = mod_extsprintf.sprintf.apply(null, args);
} else {
this.message = '';
}
if (options) {
if (options instanceof Error) {
cause = options;
} else {
cause = options.cause;
ctor = options.constructorOpt;
}
}
Error.captureStackTrace(this, ctor || this.constructor);
if (cause)
this.cause(cause);
}
mod_util.inherits(WError, Error);
WError.prototype.name = 'WError';
WError.prototype.toString = function we_toString()
{
var str = (this.hasOwnProperty('name') && this.name ||
this.constructor.name || this.constructor.prototype.name);
if (this.message)
str += ': ' + this.message;
if (this.we_cause && this.we_cause.message)
str += '; caused by ' + this.we_cause.toString();
return (str);
};
WError.prototype.cause = function we_cause(c)
{
if (c instanceof Error)
this.we_cause = c;
return (this.we_cause);
};
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