88 lines
2.4 KiB
JavaScript
88 lines
2.4 KiB
JavaScript
var tmpl = require('tmpl')
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module.exports = makeError
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function BaseError() {}
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BaseError.prototype = new Error()
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BaseError.prototype.toString = function() {
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return this.message
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}
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/**
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* Makes an Error function with the signature:
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*
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* function(message, data)
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*
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* You'll typically do something like:
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*
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* var UnknownFileTypeError = makeError(
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* 'UnknownFileTypeError',
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* 'The specified type is not known.'
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* )
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* var er = UnknownFileTypeError()
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*
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* `er` will have a prototype chain that ensures:
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*
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* er instanceof Error
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* er instanceof UnknownFileTypeError
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*
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* You can also do `var er = new UnknownFileTypeError()` if you really like the
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* `new` keyword.
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*
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* @param String The name of the error.
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* @param String The default message string.
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* @param Object The default data object, merged with per instance data.
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*/
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function makeError(name, defaultMessage, defaultData) {
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defaultMessage = tmpl(defaultMessage || '')
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defaultData = defaultData || {}
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if (defaultData.proto && !(defaultData.proto instanceof BaseError))
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throw new Error('The custom "proto" must be an Error created via makeError')
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var CustomError = function(message, data) {
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if (!(this instanceof CustomError)) return new CustomError(message, data)
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if (typeof message !== 'string' && !data) {
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data = message
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message = null
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}
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this.name = name
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this.data = data || defaultData
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if (typeof message === 'string') {
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this.message = tmpl(message, this.data)
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} else {
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this.message = defaultMessage(this.data)
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}
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var er = new Error()
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this.stack = er.stack
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if (this.stack) {
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// remove TWO stack level:
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if (typeof Components !== 'undefined') {
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// Mozilla:
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this.stack = this.stack.substring(this.stack.indexOf('\n') + 2)
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} else if (typeof chrome !== 'undefined' || typeof process !== 'undefined') {
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// Google Chrome/Node.js:
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this.stack = this.stack.replace(/\n[^\n]*/, '')
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this.stack = this.stack.replace(/\n[^\n]*/, '')
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this.stack = (
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this.name +
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(this.message ? (': ' + this.message) : '') +
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this.stack.substring(5)
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)
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}
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}
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if ('fileName' in er) this.fileName = er.fileName
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if ('lineNumber' in er) this.lineNumber = er.lineNumber
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}
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CustomError.prototype = defaultData.proto || new BaseError()
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delete defaultData.proto
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return CustomError
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}
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