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/*!
 * 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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