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Mini Shell
Mini Shell
/*!
* depd
* Copyright(c) 2014-2018 Douglas Christopher Wilson
* MIT Licensed
*/
/**
* Module dependencies.
*/
var relative = require('path').relative
/**
* Module exports.
*/
module.exports = depd
/**
* Get the path to base files on.
*/
var basePath = process.cwd()
/**
* Determine if namespace is contained in the string.
*/
function containsNamespace (str, namespace) {
var vals = str.split(/[ ,]+/)
var ns = String(namespace).toLowerCase()
for (var i = 0; i < vals.length; i++) {
var val = vals[i]
// namespace contained
if (val && (val === '*' || val.toLowerCase() === ns)) {
return true
}
}
return false
}
/**
* Convert a data descriptor to accessor descriptor.
*/
function convertDataDescriptorToAccessor (obj, prop, message) {
var descriptor = Object.getOwnPropertyDescriptor(obj, prop)
var value = descriptor.value
descriptor.get = function getter () { return value }
if (descriptor.writable) {
descriptor.set = function setter (val) { return (value = val) }
}
delete descriptor.value
delete descriptor.writable
Object.defineProperty(obj, prop, descriptor)
return descriptor
}
/**
* Create arguments string to keep arity.
*/
function createArgumentsString (arity) {
var str = ''
for (var i = 0; i < arity; i++) {
str += ', arg' + i
}
return str.substr(2)
}
/**
* Create stack string from stack.
*/
function createStackString (stack) {
var str = this.name + ': ' + this.namespace
if (this.message) {
str += ' deprecated ' + this.message
}
for (var i = 0; i < stack.length; i++) {
str += '\n at ' + stack[i].toString()
}
return str
}
/**
* Create deprecate for namespace in caller.
*/
function depd (namespace) {
if (!namespace) {
throw new TypeError('argument namespace is required')
}
var stack = getStack()
var site = callSiteLocation(stack[1])
var file = site[0]
function deprecate (message) {
// call to self as log
log.call(deprecate, message)
}
deprecate._file = file
deprecate._ignored = isignored(namespace)
deprecate._namespace = namespace
deprecate._traced = istraced(namespace)
deprecate._warned = Object.create(null)
deprecate.function = wrapfunction
deprecate.property = wrapproperty
return deprecate
}
/**
* Determine if event emitter has listeners of a given type.
*
* The way to do this check is done three different ways in Node.js >= 0.8
* so this consolidates them into a minimal set using instance methods.
*
* @param {EventEmitter} emitter
* @param {string} type
* @returns {boolean}
* @private
*/
function eehaslisteners (emitter, type) {
var count = typeof emitter.listenerCount !== 'function'
? emitter.listeners(type).length
: emitter.listenerCount(type)
return count > 0
}
/**
* Determine if namespace is ignored.
*/
function isignored (namespace) {
if (process.noDeprecation) {
// --no-deprecation support
return true
}
var str = process.env.NO_DEPRECATION || ''
// namespace ignored
return containsNamespace(str, namespace)
}
/**
* Determine if namespace is traced.
*/
function istraced (namespace) {
if (process.traceDeprecation) {
// --trace-deprecation support
return true
}
var str = process.env.TRACE_DEPRECATION || ''
// namespace traced
return containsNamespace(str, namespace)
}
/**
* Display deprecation message.
*/
function log (message, site) {
var haslisteners = eehaslisteners(process, 'deprecation')
// abort early if no destination
if (!haslisteners && this._ignored) {
return
}
var caller
var callFile
var callSite
var depSite
var i = 0
var seen = false
var stack = getStack()
var file = this._file
if (site) {
// provided site
depSite = site
callSite = callSiteLocation(stack[1])
callSite.name = depSite.name
file = callSite[0]
} else {
// get call site
i = 2
depSite = callSiteLocation(stack[i])
callSite = depSite
}
// get caller of deprecated thing in relation to file
for (; i < stack.length; i++) {
caller = callSiteLocation(stack[i])
callFile = caller[0]
if (callFile === file) {
seen = true
} else if (callFile === this._file) {
file = this._file
} else if (seen) {
break
}
}
var key = caller
? depSite.join(':') + '__' + caller.join(':')
: undefined
if (key !== undefined && key in this._warned) {
// already warned
return
}
this._warned[key] = true
// generate automatic message from call site
var msg = message
if (!msg) {
msg = callSite === depSite || !callSite.name
? defaultMessage(depSite)
: defaultMessage(callSite)
}
// emit deprecation if listeners exist
if (haslisteners) {
var err = DeprecationError(this._namespace, msg, stack.slice(i))
process.emit('deprecation', err)
return
}
// format and write message
var format = process.stderr.isTTY
? formatColor
: formatPlain
var output = format.call(this, msg, caller, stack.slice(i))
process.stderr.write(output + '\n', 'utf8')
}
/**
* Get call site location as array.
*/
function callSiteLocation (callSite) {
var file = callSite.getFileName() || '<anonymous>'
var line = callSite.getLineNumber()
var colm = callSite.getColumnNumber()
if (callSite.isEval()) {
file = callSite.getEvalOrigin() + ', ' + file
}
var site = [file, line, colm]
site.callSite = callSite
site.name = callSite.getFunctionName()
return site
}
/**
* Generate a default message from the site.
*/
function defaultMessage (site) {
var callSite = site.callSite
var funcName = site.name
// make useful anonymous name
if (!funcName) {
funcName = '<anonymous@' + formatLocation(site) + '>'
}
var context = callSite.getThis()
var typeName = context && callSite.getTypeName()
// ignore useless type name
if (typeName === 'Object') {
typeName = undefined
}
// make useful type name
if (typeName === 'Function') {
typeName = context.name || typeName
}
return typeName && callSite.getMethodName()
? typeName + '.' + funcName
: funcName
}
/**
* Format deprecation message without color.
*/
function formatPlain (msg, caller, stack) {
var timestamp = new Date().toUTCString()
var formatted = timestamp +
' ' + this._namespace +
' deprecated ' + msg
// add stack trace
if (this._traced) {
for (var i = 0; i < stack.length; i++) {
formatted += '\n at ' + stack[i].toString()
}
return formatted
}
if (caller) {
formatted += ' at ' + formatLocation(caller)
}
return formatted
}
/**
* Format deprecation message with color.
*/
function formatColor (msg, caller, stack) {
var formatted = '\x1b[36;1m' + this._namespace + '\x1b[22;39m' + // bold cyan
' \x1b[33;1mdeprecated\x1b[22;39m' + // bold yellow
' \x1b[0m' + msg + '\x1b[39m' // reset
// add stack trace
if (this._traced) {
for (var i = 0; i < stack.length; i++) {
formatted += '\n \x1b[36mat ' + stack[i].toString() + '\x1b[39m' // cyan
}
return formatted
}
if (caller) {
formatted += ' \x1b[36m' + formatLocation(caller) + '\x1b[39m' // cyan
}
return formatted
}
/**
* Format call site location.
*/
function formatLocation (callSite) {
return relative(basePath, callSite[0]) +
':' + callSite[1] +
':' + callSite[2]
}
/**
* Get the stack as array of call sites.
*/
function getStack () {
var limit = Error.stackTraceLimit
var obj = {}
var prep = Error.prepareStackTrace
Error.prepareStackTrace = prepareObjectStackTrace
Error.stackTraceLimit = Math.max(10, limit)
// capture the stack
Error.captureStackTrace(obj)
// slice this function off the top
var stack = obj.stack.slice(1)
Error.prepareStackTrace = prep
Error.stackTraceLimit = limit
return stack
}
/**
* Capture call site stack from v8.
*/
function prepareObjectStackTrace (obj, stack) {
return stack
}
/**
* Return a wrapped function in a deprecation message.
*/
function wrapfunction (fn, message) {
if (typeof fn !== 'function') {
throw new TypeError('argument fn must be a function')
}
var args = createArgumentsString(fn.length)
var stack = getStack()
var site = callSiteLocation(stack[1])
site.name = fn.name
// eslint-disable-next-line no-new-func
var deprecatedfn = new Function('fn', 'log', 'deprecate', 'message', 'site',
'"use strict"\n' +
'return function (' + args + ') {' +
'log.call(deprecate, message, site)\n' +
'return fn.apply(this, arguments)\n' +
'}')(fn, log, this, message, site)
return deprecatedfn
}
/**
* Wrap property in a deprecation message.
*/
function wrapproperty (obj, prop, message) {
if (!obj || (typeof obj !== 'object' && typeof obj !== 'function')) {
throw new TypeError('argument obj must be object')
}
var descriptor = Object.getOwnPropertyDescriptor(obj, prop)
if (!descriptor) {
throw new TypeError('must call property on owner object')
}
if (!descriptor.configurable) {
throw new TypeError('property must be configurable')
}
var deprecate = this
var stack = getStack()
var site = callSiteLocation(stack[1])
// set site name
site.name = prop
// convert data descriptor
if ('value' in descriptor) {
descriptor = convertDataDescriptorToAccessor(obj, prop, message)
}
var get = descriptor.get
var set = descriptor.set
// wrap getter
if (typeof get === 'function') {
descriptor.get = function getter () {
log.call(deprecate, message, site)
return get.apply(this, arguments)
}
}
// wrap setter
if (typeof set === 'function') {
descriptor.set = function setter () {
log.call(deprecate, message, site)
return set.apply(this, arguments)
}
}
Object.defineProperty(obj, prop, descriptor)
}
/**
* Create DeprecationError for deprecation
*/
function DeprecationError (namespace, message, stack) {
var error = new Error()
var stackString
Object.defineProperty(error, 'constructor', {
value: DeprecationError
})
Object.defineProperty(error, 'message', {
configurable: true,
enumerable: false,
value: message,
writable: true
})
Object.defineProperty(error, 'name', {
enumerable: false,
configurable: true,
value: 'DeprecationError',
writable: true
})
Object.defineProperty(error, 'namespace', {
configurable: true,
enumerable: false,
value: namespace,
writable: true
})
Object.defineProperty(error, 'stack', {
configurable: true,
enumerable: false,
get: function () {
if (stackString !== undefined) {
return stackString
}
// prepare stack trace
return (stackString = createStackString.call(this, stack))
},
set: function setter (val) {
stackString = val
}
})
return error
}
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