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+/*!
+ * depd
+ * Copyright(c) 2014 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+/**
+ * Module dependencies.
+ */
+
+var callSiteToString = require('./lib/compat').callSiteToString
+var EventEmitter = require('events').EventEmitter
+var relative = require('path').relative
+
+/**
+ * Module exports.
+ */
+
+module.exports = depd
+
+/**
+ * Get the path to base files on.
+ */
+
+var basePath = process.cwd()
+
+/**
+ * Get listener count on event emitter.
+ */
+
+/*istanbul ignore next*/
+var eventListenerCount = EventEmitter.listenerCount
+ || function (emitter, type) { return emitter.listeners(type).length }
+
+/**
+ * Determine if namespace is contained in the string.
+ */
+
+function containsNamespace(str, namespace) {
+ var val = str.split(/[ ,]+/)
+
+ namespace = String(namespace).toLowerCase()
+
+ for (var i = 0 ; i < val.length; i++) {
+ if (!(str = val[i])) continue;
+
+ // namespace contained
+ if (str === '*' || str.toLowerCase() === namespace) {
+ 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 ' + callSiteToString(stack[i])
+ }
+
+ 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 namespace is ignored.
+ */
+
+function isignored(namespace) {
+ /* istanbul ignore next: tested in a child processs */
+ 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) {
+ /* istanbul ignore next: tested in a child processs */
+ 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 = eventListenerCount(process, 'deprecation') !== 0
+
+ // abort early if no destination
+ if (!haslisteners && this._ignored) {
+ return
+ }
+
+ var caller
+ var callFile
+ var callSite
+ var i = 0
+ var seen = false
+ var stack = getStack()
+ var file = this._file
+
+ if (site) {
+ // provided site
+ callSite = callSiteLocation(stack[1])
+ callSite.name = site.name
+ file = callSite[0]
+ } else {
+ // get call site
+ i = 2
+ site = callSiteLocation(stack[i])
+ callSite = site
+ }
+
+ // 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
+ ? site.join(':') + '__' + caller.join(':')
+ : undefined
+
+ if (key !== undefined && key in this._warned) {
+ // already warned
+ return
+ }
+
+ this._warned[key] = true
+
+ // generate automatic message from call site
+ if (!message) {
+ message = callSite === site || !callSite.name
+ ? defaultMessage(site)
+ : defaultMessage(callSite)
+ }
+
+ // emit deprecation if listeners exist
+ if (haslisteners) {
+ var err = DeprecationError(this._namespace, message, stack.slice(i))
+ process.emit('deprecation', err)
+ return
+ }
+
+ // format and write message
+ var format = process.stderr.isTTY
+ ? formatColor
+ : formatPlain
+ var msg = format.call(this, message, caller, stack.slice(i))
+ process.stderr.write(msg + '\n', 'utf8')
+
+ return
+}
+
+/**
+ * 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
+ var typeName = callSite.getTypeName()
+
+ // make useful anonymous name
+ if (!funcName) {
+ funcName = '<anonymous@' + formatLocation(site) + '>'
+ }
+
+ // make useful type name
+ if (typeName === 'Function') {
+ typeName = callSite.getThis().name || typeName
+ }
+
+ return 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 ' + callSiteToString(stack[i])
+ }
+
+ 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 ' + callSiteToString(stack[i]) + '\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 deprecate = this
+ var stack = getStack()
+ var site = callSiteLocation(stack[1])
+
+ site.name = fn.name
+
+ var deprecatedfn = eval('(function (' + args + ') {\n'
+ + '"use strict"\n'
+ + 'log.call(deprecate, message, site)\n'
+ + 'return fn.apply(this, arguments)\n'
+ + '})')
+
+ 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
+}