vue2/packages/vue-template-compiler/build.js

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

function _interopDefault (ex) { return (ex && (typeof ex === 'object') && 'default' in ex) ? ex['default'] : ex; }

var entities = require('entities');
var deindent = _interopDefault(require('de-indent'));

/*  */

/**
 * Convert a value to a string that is actually rendered.
 */
function _toString (val) {
  return val == null
    ? ''
    : typeof val === 'object'
      ? JSON.stringify(val, null, 2)
      : String(val)
}

/**
 * Convert a input value to a number for persistence.
 * If the conversion fails, return original string.
 */
function toNumber (val) {
  var n = parseFloat(val, 10)
  return (n || n === 0) ? n : val
}

/**
 * Make a map and return a function for checking if a key
 * is in that map.
 */
function makeMap (
  str,
  expectsLowerCase
) {
  var map = Object.create(null)
  var list = str.split(',')
  for (var i = 0; i < list.length; i++) {
    map[list[i]] = true
  }
  return expectsLowerCase
    ? function (val) { return map[val.toLowerCase()]; }
    : function (val) { return map[val]; }
}

/**
 * Check if a tag is a built-in tag.
 */
var isBuiltInTag = makeMap('slot,component', true)

/**
 * Remove an item from an array
 */
function remove (arr, item) {
  if (arr.length) {
    var index = arr.indexOf(item)
    if (index > -1) {
      return arr.splice(index, 1)
    }
  }
}

/**
 * Check whether the object has the property.
 */
var hasOwnProperty = Object.prototype.hasOwnProperty
function hasOwn (obj, key) {
  return hasOwnProperty.call(obj, key)
}

/**
 * Check if value is primitive
 */
function isPrimitive (value) {
  return typeof value === 'string' || typeof value === 'number'
}

/**
 * Create a cached version of a pure function.
 */
function cached (fn) {
  var cache = Object.create(null)
  return function cachedFn (str) {
    var hit = cache[str]
    return hit || (cache[str] = fn(str))
  }
}

/**
 * Camelize a hyphen-delmited string.
 */
var camelizeRE = /-(\w)/g
var camelize = cached(function (str) {
  return str.replace(camelizeRE, function (_, c) { return c ? c.toUpperCase() : ''; })
})

/**
 * Capitalize a string.
 */
var capitalize = cached(function (str) {
  return str.charAt(0).toUpperCase() + str.slice(1)
})

/**
 * Hyphenate a camelCase string.
 */
var hyphenateRE = /([^-])([A-Z])/g
var hyphenate = cached(function (str) {
  return str
    .replace(hyphenateRE, '$1-$2')
    .replace(hyphenateRE, '$1-$2')
    .toLowerCase()
})

/**
 * Simple bind, faster than native
 */
function bind (fn, ctx) {
  function boundFn (a) {
    var l = arguments.length
    return l
      ? l > 1
        ? fn.apply(ctx, arguments)
        : fn.call(ctx, a)
      : fn.call(ctx)
  }
  // record original fn length
  boundFn._length = fn.length
  return boundFn
}

/**
 * Convert an Array-like object to a real Array.
 */
function toArray (list, start) {
  start = start || 0
  var i = list.length - start
  var ret = new Array(i)
  while (i--) {
    ret[i] = list[i + start]
  }
  return ret
}

/**
 * Mix properties into target object.
 */
function extend (to, _from) {
  for (var key in _from) {
    to[key] = _from[key]
  }
  return to
}

/**
 * Quick object check - this is primarily used to tell
 * Objects from primitive values when we know the value
 * is a JSON-compliant type.
 */
function isObject (obj) {
  return obj !== null && typeof obj === 'object'
}

/**
 * Strict object type check. Only returns true
 * for plain JavaScript objects.
 */
var toString = Object.prototype.toString
var OBJECT_STRING = '[object Object]'
function isPlainObject (obj) {
  return toString.call(obj) === OBJECT_STRING
}

/**
 * Merge an Array of Objects into a single Object.
 */
function toObject (arr) {
  var res = arr[0] || {}
  for (var i = 1; i < arr.length; i++) {
    if (arr[i]) {
      extend(res, arr[i])
    }
  }
  return res
}

/**
 * Perform no operation.
 */
function noop () {}

/**
 * Always return false.
 */
var no = function () { return false; }

/**
 * Generate a static keys string from compiler modules.
 */
function genStaticKeys (modules) {
  return modules.reduce(function (keys, m) {
    return keys.concat(m.staticKeys || [])
  }, []).join(',')
}

/*  */

var config = {
  /**
   * Option merge strategies (used in core/util/options)
   */
  optionMergeStrategies: Object.create(null),

  /**
   * Whether to suppress warnings.
   */
  silent: false,

  /**
   * Whether to enable devtools
   */
  devtools: process.env.NODE_ENV !== 'production',

  /**
   * Error handler for watcher errors
   */
  errorHandler: null,

  /**
   * Ignore certain custom elements
   */
  ignoredElements: null,

  /**
   * Custom user key aliases for v-on
   */
  keyCodes: Object.create(null),

  /**
   * Check if a tag is reserved so that it cannot be registered as a
   * component. This is platform-dependent and may be overwritten.
   */
  isReservedTag: no,

  /**
   * Check if a tag is an unknown element.
   * Platform-dependent.
   */
  isUnknownElement: no,

  /**
   * Get the namespace of an element
   */
  getTagNamespace: noop,

  /**
   * Check if an attribute must be bound using property, e.g. value
   * Platform-dependent.
   */
  mustUseProp: no,

  /**
   * List of asset types that a component can own.
   */
  _assetTypes: [
    'component',
    'directive',
    'filter'
  ],

  /**
   * List of lifecycle hooks.
   */
  _lifecycleHooks: [
    'beforeCreate',
    'created',
    'beforeMount',
    'mounted',
    'beforeUpdate',
    'updated',
    'beforeDestroy',
    'destroyed',
    'activated',
    'deactivated'
  ],

  /**
   * Max circular updates allowed in a scheduler flush cycle.
   */
  _maxUpdateCount: 100,

  /**
   * Server rendering?
   */
  _isServer: process.env.VUE_ENV === 'server'
}

var warn
var formatComponentName

if (process.env.NODE_ENV !== 'production') {
  var hasConsole = typeof console !== 'undefined'

  warn = function (msg, vm) {
    if (hasConsole && (!config.silent)) {
      console.error("[Vue warn]: " + msg + " " + (
        vm ? formatLocation(formatComponentName(vm)) : ''
      ))
    }
  }

  formatComponentName = function (vm) {
    if (vm.$root === vm) {
      return 'root instance'
    }
    var name = vm._isVue
      ? vm.$options.name || vm.$options._componentTag
      : vm.name
    return name ? ("component <" + name + ">") : "anonymous component"
  }

  var formatLocation = function (str) {
    if (str === 'anonymous component') {
      str += " - use the \"name\" option for better debugging messages."
    }
    return ("(found in " + str + ")")
  }
}

/*  */

/**
 * Check if a string starts with $ or _
 */
function isReserved (str) {
  var c = (str + '').charCodeAt(0)
  return c === 0x24 || c === 0x5F
}

/**
 * Define a property.
 */
function def (obj, key, val, enumerable) {
  Object.defineProperty(obj, key, {
    value: val,
    enumerable: !!enumerable,
    writable: true,
    configurable: true
  })
}

/**
 * Parse simple path.
 */
var bailRE = /[^\w\.\$]/
function parsePath (path) {
  if (bailRE.test(path)) {
    return
  } else {
    var segments = path.split('.')
    return function (obj) {
      for (var i = 0; i < segments.length; i++) {
        if (!obj) return
        obj = obj[segments[i]]
      }
      return obj
    }
  }
}

/*  */

/* global MutationObserver */
// can we use __proto__?
var hasProto = '__proto__' in {}

// Browser environment sniffing
var inBrowser =
  typeof window !== 'undefined' &&
  Object.prototype.toString.call(window) !== '[object Object]'

// detect devtools
var devtools = inBrowser && window.__VUE_DEVTOOLS_GLOBAL_HOOK__

// UA sniffing for working around browser-specific quirks
var UA$1 = inBrowser && window.navigator.userAgent.toLowerCase()
var isIos = UA$1 && /(iphone|ipad|ipod|ios)/i.test(UA$1)
var iosVersionMatch = UA$1 && isIos && UA$1.match(/os ([\d_]+)/)
var iosVersion = iosVersionMatch && iosVersionMatch[1].split('_')

// MutationObserver is unreliable in iOS 9.3 UIWebView
// detecting it by checking presence of IndexedDB
// ref #3027
var hasMutationObserverBug =
  iosVersion &&
  Number(iosVersion[0]) >= 9 &&
  Number(iosVersion[1]) >= 3 &&
  !window.indexedDB

/**
 * Defer a task to execute it asynchronously. Ideally this
 * should be executed as a microtask, so we leverage
 * MutationObserver if it's available, and fallback to
 * setTimeout(0).
 *
 * @param {Function} cb
 * @param {Object} ctx
 */
var nextTick = (function () {
  var callbacks = []
  var pending = false
  var timerFunc
  function nextTickHandler () {
    pending = false
    var copies = callbacks.slice(0)
    callbacks = []
    for (var i = 0; i < copies.length; i++) {
      copies[i]()
    }
  }

  /* istanbul ignore else */
  if (typeof MutationObserver !== 'undefined' && !hasMutationObserverBug) {
    var counter = 1
    var observer = new MutationObserver(nextTickHandler)
    var textNode = document.createTextNode(String(counter))
    observer.observe(textNode, {
      characterData: true
    })
    timerFunc = function () {
      counter = (counter + 1) % 2
      textNode.data = String(counter)
    }
  } else {
    // webpack attempts to inject a shim for setImmediate
    // if it is used as a global, so we have to work around that to
    // avoid bundling unnecessary code.
    var context = inBrowser
      ? window
      : typeof global !== 'undefined' ? global : {}
    timerFunc = context.setImmediate || setTimeout
  }
  return function (cb, ctx) {
    var func = ctx
      ? function () { cb.call(ctx) }
      : cb
    callbacks.push(func)
    if (pending) return
    pending = true
    timerFunc(nextTickHandler, 0)
  }
})()

var _Set
/* istanbul ignore if */
if (typeof Set !== 'undefined' && /native code/.test(Set.toString())) {
  // use native Set when available.
  _Set = Set
} else {
  // a non-standard Set polyfill that only works with primitive keys.
  _Set = (function () {
    function Set () {
      this.set = Object.create(null)
    }
    Set.prototype.has = function has (key) {
      return this.set[key] !== undefined
    };
    Set.prototype.add = function add (key) {
      this.set[key] = 1
    };
    Set.prototype.clear = function clear () {
      this.set = Object.create(null)
    };

    return Set;
  }())
}

/* not type checking this file because flow doesn't play well with Proxy */

var hasProxy;
var proxyHandlers;
var initProxy;
if (process.env.NODE_ENV !== 'production') {
  var allowedGlobals = makeMap(
    'Infinity,undefined,NaN,isFinite,isNaN,' +
    'parseFloat,parseInt,decodeURI,decodeURIComponent,encodeURI,encodeURIComponent,' +
    'Math,Number,Date,Array,Object,Boolean,String,RegExp,Map,Set,JSON,Intl,' +
    'require' // for Webpack/Browserify
  )

  hasProxy =
    typeof Proxy !== 'undefined' &&
    Proxy.toString().match(/native code/)

  proxyHandlers = {
    has: function has (target, key) {
      var has = key in target
      var isAllowed = allowedGlobals(key) || key.charAt(0) === '_'
      if (!has && !isAllowed) {
        warn(
          "Property or method \"" + key + "\" is not defined on the instance but " +
          "referenced during render. Make sure to declare reactive data " +
          "properties in the data option.",
          target
        )
      }
      return has || !isAllowed
    }
  }

  initProxy = function initProxy (vm) {
    if (hasProxy) {
      vm._renderProxy = new Proxy(vm, proxyHandlers)
    } else {
      vm._renderProxy = vm
    }
  }
}

/*  */


var uid$2 = 0

/**
 * A dep is an observable that can have multiple
 * directives subscribing to it.
 */
var Dep = function Dep () {
  this.id = uid$2++
  this.subs = []
};

Dep.prototype.addSub = function addSub (sub) {
  this.subs.push(sub)
};

Dep.prototype.removeSub = function removeSub (sub) {
  remove(this.subs, sub)
};

Dep.prototype.depend = function depend () {
  if (Dep.target) {
    Dep.target.addDep(this)
  }
};

Dep.prototype.notify = function notify () {
  // stablize the subscriber list first
  var subs = this.subs.slice()
  for (var i = 0, l = subs.length; i < l; i++) {
    subs[i].update()
  }
};

// the current target watcher being evaluated.
// this is globally unique because there could be only one
// watcher being evaluated at any time.
Dep.target = null
var targetStack = []

function pushTarget (_target) {
  if (Dep.target) targetStack.push(Dep.target)
  Dep.target = _target
}

function popTarget () {
  Dep.target = targetStack.pop()
}

/*  */


var queue = []
var has = {}
var circular = {}
var waiting = false
var flushing = false
var index = 0

/**
 * Reset the scheduler's state.
 */
function resetSchedulerState () {
  queue.length = 0
  has = {}
  if (process.env.NODE_ENV !== 'production') {
    circular = {}
  }
  waiting = flushing = false
}

/**
 * Flush both queues and run the watchers.
 */
function flushSchedulerQueue () {
  flushing = true

  // Sort queue before flush.
  // This ensures that:
  // 1. Components are updated from parent to child. (because parent is always
  //    created before the child)
  // 2. A component's user watchers are run before its render watcher (because
  //    user watchers are created before the render watcher)
  // 3. If a component is destroyed during a parent component's watcher run,
  //    its watchers can be skipped.
  queue.sort(function (a, b) { return a.id - b.id; })

  // do not cache length because more watchers might be pushed
  // as we run existing watchers
  for (index = 0; index < queue.length; index++) {
    var watcher = queue[index]
    var id = watcher.id
    has[id] = null
    watcher.run()
    // in dev build, check and stop circular updates.
    if (process.env.NODE_ENV !== 'production' && has[id] != null) {
      circular[id] = (circular[id] || 0) + 1
      if (circular[id] > config._maxUpdateCount) {
        warn(
          'You may have an infinite update loop ' + (
            watcher.user
              ? ("in watcher with expression \"" + (watcher.expression) + "\"")
              : "in a component render function."
          ),
          watcher.vm
        )
        break
      }
    }
  }

  // devtool hook
  /* istanbul ignore if */
  if (devtools && config.devtools) {
    devtools.emit('flush')
  }

  resetSchedulerState()
}

/**
 * Push a watcher into the watcher queue.
 * Jobs with duplicate IDs will be skipped unless it's
 * pushed when the queue is being flushed.
 */
function queueWatcher (watcher) {
  var id = watcher.id
  if (has[id] == null) {
    has[id] = true
    if (!flushing) {
      queue.push(watcher)
    } else {
      // if already flushing, splice the watcher based on its id
      // if already past its id, it will be run next immediately.
      var i = queue.length - 1
      while (i >= 0 && queue[i].id > watcher.id) {
        i--
      }
      queue.splice(Math.max(i, index) + 1, 0, watcher)
    }
    // queue the flush
    if (!waiting) {
      waiting = true
      nextTick(flushSchedulerQueue)
    }
  }
}

/*  */

var uid$1 = 0

/**
 * A watcher parses an expression, collects dependencies,
 * and fires callback when the expression value changes.
 * This is used for both the $watch() api and directives.
 */
var Watcher = function Watcher (
  vm,
  expOrFn,
  cb,
  options
) {
  if ( options === void 0 ) options = {};

  this.vm = vm
  vm._watchers.push(this)
  // options
  this.deep = !!options.deep
  this.user = !!options.user
  this.lazy = !!options.lazy
  this.sync = !!options.sync
  this.expression = expOrFn.toString()
  this.cb = cb
  this.id = ++uid$1 // uid for batching
  this.active = true
  this.dirty = this.lazy // for lazy watchers
  this.deps = []
  this.newDeps = []
  this.depIds = new _Set()
  this.newDepIds = new _Set()
  // parse expression for getter
  if (typeof expOrFn === 'function') {
    this.getter = expOrFn
  } else {
    this.getter = parsePath(expOrFn)
    if (!this.getter) {
      this.getter = function () {}
      process.env.NODE_ENV !== 'production' && warn(
        "Failed watching path: \"" + expOrFn + "\" " +
        'Watcher only accepts simple dot-delimited paths. ' +
        'For full control, use a function instead.',
        vm
      )
    }
  }
  this.value = this.lazy
    ? undefined
    : this.get()
};

/**
 * Evaluate the getter, and re-collect dependencies.
 */
Watcher.prototype.get = function get () {
  pushTarget(this)
  var value = this.getter.call(this.vm, this.vm)
  // "touch" every property so they are all tracked as
  // dependencies for deep watching
  if (this.deep) {
    traverse(value)
  }
  popTarget()
  this.cleanupDeps()
  return value
};

/**
 * Add a dependency to this directive.
 */
Watcher.prototype.addDep = function addDep (dep) {
  var id = dep.id
  if (!this.newDepIds.has(id)) {
    this.newDepIds.add(id)
    this.newDeps.push(dep)
    if (!this.depIds.has(id)) {
      dep.addSub(this)
    }
  }
};

/**
 * Clean up for dependency collection.
 */
Watcher.prototype.cleanupDeps = function cleanupDeps () {
    var this$1 = this;

  var i = this.deps.length
  while (i--) {
    var dep = this$1.deps[i]
    if (!this$1.newDepIds.has(dep.id)) {
      dep.removeSub(this$1)
    }
  }
  var tmp = this.depIds
  this.depIds = this.newDepIds
  this.newDepIds = tmp
  this.newDepIds.clear()
  tmp = this.deps
  this.deps = this.newDeps
  this.newDeps = tmp
  this.newDeps.length = 0
};

/**
 * Subscriber interface.
 * Will be called when a dependency changes.
 */
Watcher.prototype.update = function update () {
  /* istanbul ignore else */
  if (this.lazy) {
    this.dirty = true
  } else if (this.sync) {
    this.run()
  } else {
    queueWatcher(this)
  }
};

/**
 * Scheduler job interface.
 * Will be called by the scheduler.
 */
Watcher.prototype.run = function run () {
  if (this.active) {
    var value = this.get()
      if (
        value !== this.value ||
      // Deep watchers and watchers on Object/Arrays should fire even
      // when the value is the same, because the value may
      // have mutated.
      isObject(value) ||
      this.deep
    ) {
      // set new value
      var oldValue = this.value
      this.value = value
      if (this.user) {
        try {
          this.cb.call(this.vm, value, oldValue)
        } catch (e) {
          process.env.NODE_ENV !== 'production' && warn(
            ("Error in watcher \"" + (this.expression) + "\""),
            this.vm
          )
          /* istanbul ignore else */
          if (config.errorHandler) {
            config.errorHandler.call(null, e, this.vm)
          } else {
            throw e
          }
        }
      } else {
        this.cb.call(this.vm, value, oldValue)
      }
    }
  }
};

/**
 * Evaluate the value of the watcher.
 * This only gets called for lazy watchers.
 */
Watcher.prototype.evaluate = function evaluate () {
  this.value = this.get()
  this.dirty = false
};

/**
 * Depend on all deps collected by this watcher.
 */
Watcher.prototype.depend = function depend () {
    var this$1 = this;

  var i = this.deps.length
  while (i--) {
    this$1.deps[i].depend()
  }
};

/**
 * Remove self from all dependencies' subcriber list.
 */
Watcher.prototype.teardown = function teardown () {
    var this$1 = this;

  if (this.active) {
    // remove self from vm's watcher list
    // this is a somewhat expensive operation so we skip it
    // if the vm is being destroyed or is performing a v-for
    // re-render (the watcher list is then filtered by v-for).
    if (!this.vm._isBeingDestroyed && !this.vm._vForRemoving) {
      remove(this.vm._watchers, this)
    }
    var i = this.deps.length
    while (i--) {
      this$1.deps[i].removeSub(this$1)
    }
    this.active = false
  }
};

/**
 * Recursively traverse an object to evoke all converted
 * getters, so that every nested property inside the object
 * is collected as a "deep" dependency.
 */
var seenObjects = new _Set()
function traverse (val, seen) {
  var i, keys
  if (!seen) {
    seen = seenObjects
    seen.clear()
  }
  var isA = Array.isArray(val)
  var isO = isObject(val)
  if ((isA || isO) && Object.isExtensible(val)) {
    if (val.__ob__) {
      var depId = val.__ob__.dep.id
      if (seen.has(depId)) {
        return
      } else {
        seen.add(depId)
      }
    }
    if (isA) {
      i = val.length
      while (i--) traverse(val[i], seen)
    } else if (isO) {
      keys = Object.keys(val)
      i = keys.length
      while (i--) traverse(val[keys[i]], seen)
    }
  }
}

/*
 * not type checking this file because flow doesn't play well with
 * dynamically accessing methods on Array prototype
 */

var arrayProto = Array.prototype
var arrayMethods = Object.create(arrayProto)

/**
 * Intercept mutating methods and emit events
 */
;[
  'push',
  'pop',
  'shift',
  'unshift',
  'splice',
  'sort',
  'reverse'
]
.forEach(function (method) {
  // cache original method
  var original = arrayProto[method]
  def(arrayMethods, method, function mutator () {
    var arguments$1 = arguments;

    // avoid leaking arguments:
    // http://jsperf.com/closure-with-arguments
    var i = arguments.length
    var args = new Array(i)
    while (i--) {
      args[i] = arguments$1[i]
    }
    var result = original.apply(this, args)
    var ob = this.__ob__
    var inserted
    switch (method) {
      case 'push':
        inserted = args
        break
      case 'unshift':
        inserted = args
        break
      case 'splice':
        inserted = args.slice(2)
        break
    }
    if (inserted) ob.observeArray(inserted)
    // notify change
    ob.dep.notify()
    return result
  })
})

/*  */

var arrayKeys = Object.getOwnPropertyNames(arrayMethods)

/**
 * By default, when a reactive property is set, the new value is
 * also converted to become reactive. However when passing down props,
 * we don't want to force conversion because the value may be a nested value
 * under a frozen data structure. Converting it would defeat the optimization.
 */
var observerState = {
  shouldConvert: true,
  isSettingProps: false
}

/**
 * Observer class that are attached to each observed
 * object. Once attached, the observer converts target
 * object's property keys into getter/setters that
 * collect dependencies and dispatches updates.
 */
var Observer = function Observer (value) {
  this.value = value
  this.dep = new Dep()
  this.vmCount = 0
  def(value, '__ob__', this)
  if (Array.isArray(value)) {
    var augment = hasProto
      ? protoAugment
      : copyAugment
    augment(value, arrayMethods, arrayKeys)
    this.observeArray(value)
  } else {
    this.walk(value)
  }
};

/**
 * Walk through each property and convert them into
 * getter/setters. This method should only be called when
 * value type is Object.
 */
Observer.prototype.walk = function walk (obj) {
  var val = this.value
  for (var key in obj) {
    defineReactive(val, key, obj[key])
  }
};

/**
 * Observe a list of Array items.
 */
Observer.prototype.observeArray = function observeArray (items) {
  for (var i = 0, l = items.length; i < l; i++) {
    observe(items[i])
  }
};

// helpers

/**
 * Augment an target Object or Array by intercepting
 * the prototype chain using __proto__
 */
function protoAugment (target, src) {
  /* eslint-disable no-proto */
  target.__proto__ = src
  /* eslint-enable no-proto */
}

/**
 * Augment an target Object or Array by defining
 * hidden properties.
 *
 * istanbul ignore next
 */
function copyAugment (target, src, keys) {
  for (var i = 0, l = keys.length; i < l; i++) {
    var key = keys[i]
    def(target, key, src[key])
  }
}

/**
 * Attempt to create an observer instance for a value,
 * returns the new observer if successfully observed,
 * or the existing observer if the value already has one.
 */
function observe (value) {
  if (!isObject(value)) {
    return
  }
  var ob
  if (hasOwn(value, '__ob__') && value.__ob__ instanceof Observer) {
    ob = value.__ob__
  } else if (
    observerState.shouldConvert &&
    !config._isServer &&
    (Array.isArray(value) || isPlainObject(value)) &&
    Object.isExtensible(value) &&
    !value._isVue
  ) {
    ob = new Observer(value)
  }
  return ob
}

/**
 * Define a reactive property on an Object.
 */
function defineReactive (
  obj,
  key,
  val,
  customSetter
) {
  var dep = new Dep()

  var property = Object.getOwnPropertyDescriptor(obj, key)
  if (property && property.configurable === false) {
    return
  }

  // cater for pre-defined getter/setters
  var getter = property && property.get
  var setter = property && property.set

  var childOb = observe(val)
  Object.defineProperty(obj, key, {
    enumerable: true,
    configurable: true,
    get: function reactiveGetter () {
      var value = getter ? getter.call(obj) : val
      if (Dep.target) {
        dep.depend()
        if (childOb) {
          childOb.dep.depend()
        }
        if (Array.isArray(value)) {
          for (var e, i = 0, l = value.length; i < l; i++) {
            e = value[i]
            e && e.__ob__ && e.__ob__.dep.depend()
          }
        }
      }
      return value
    },
    set: function reactiveSetter (newVal) {
      var value = getter ? getter.call(obj) : val
      if (newVal === value) {
        return
      }
      if (process.env.NODE_ENV !== 'production' && customSetter) {
        customSetter()
      }
      if (setter) {
        setter.call(obj, newVal)
      } else {
        val = newVal
      }
      childOb = observe(newVal)
      dep.notify()
    }
  })
}

/**
 * Set a property on an object. Adds the new property and
 * triggers change notification if the property doesn't
 * already exist.
 */
function set (obj, key, val) {
  if (Array.isArray(obj)) {
    obj.splice(key, 1, val)
    return val
  }
  if (hasOwn(obj, key)) {
    obj[key] = val
    return
  }
  var ob = obj.__ob__
  if (obj._isVue || (ob && ob.vmCount)) {
    process.env.NODE_ENV !== 'production' && warn(
      'Avoid adding reactive properties to a Vue instance or its root $data ' +
      'at runtime - declare it upfront in the data option.'
    )
    return
  }
  if (!ob) {
    obj[key] = val
    return
  }
  defineReactive(ob.value, key, val)
  ob.dep.notify()
  return val
}

/**
 * Delete a property and trigger change if necessary.
 */
function del (obj, key) {
  var ob = obj.__ob__
  if (obj._isVue || (ob && ob.vmCount)) {
    process.env.NODE_ENV !== 'production' && warn(
      'Avoid deleting properties on a Vue instance or its root $data ' +
      '- just set it to null.'
    )
    return
  }
  if (!hasOwn(obj, key)) {
    return
  }
  delete obj[key]
  if (!ob) {
    return
  }
  ob.dep.notify()
}

/*  */

function initState (vm) {
  vm._watchers = []
  initProps(vm)
  initData(vm)
  initComputed(vm)
  initMethods(vm)
  initWatch(vm)
}

function initProps (vm) {
  var props = vm.$options.props
  var propsData = vm.$options.propsData
  if (props) {
    var keys = vm.$options._propKeys = Object.keys(props)
    var isRoot = !vm.$parent
    // root instance props should be converted
    observerState.shouldConvert = isRoot
    var loop = function ( i ) {
      var key = keys[i]
      /* istanbul ignore else */
      if (process.env.NODE_ENV !== 'production') {
        defineReactive(vm, key, validateProp(key, props, propsData, vm), function () {
          if (vm.$parent && !observerState.isSettingProps) {
            warn(
              "Avoid mutating a prop directly since the value will be " +
              "overwritten whenever the parent component re-renders. " +
              "Instead, use a data or computed property based on the prop's " +
              "value. Prop being mutated: \"" + key + "\"",
              vm
            )
          }
        })
      } else {
        defineReactive(vm, key, validateProp(key, props, propsData, vm))
      }
    };

    for (var i = 0; i < keys.length; i++) loop( i );
    observerState.shouldConvert = true
  }
}

function initData (vm) {
  var data = vm.$options.data
  data = vm._data = typeof data === 'function'
    ? data.call(vm)
    : data || {}
  if (!isPlainObject(data)) {
    data = {}
    process.env.NODE_ENV !== 'production' && warn(
      'data functions should return an object.',
      vm
    )
  }
  // proxy data on instance
  var keys = Object.keys(data)
  var props = vm.$options.props
  var i = keys.length
  while (i--) {
    if (props && hasOwn(props, keys[i])) {
      process.env.NODE_ENV !== 'production' && warn(
        "The data property \"" + (keys[i]) + "\" is already declared as a prop. " +
        "Use prop default value instead.",
        vm
      )
    } else {
      proxy(vm, keys[i])
    }
  }
  // observe data
  observe(data)
  data.__ob__ && data.__ob__.vmCount++
}

var computedSharedDefinition = {
  enumerable: true,
  configurable: true,
  get: noop,
  set: noop
}

function initComputed (vm) {
  var computed = vm.$options.computed
  if (computed) {
    for (var key in computed) {
      var userDef = computed[key]
      if (typeof userDef === 'function') {
        computedSharedDefinition.get = makeComputedGetter(userDef, vm)
        computedSharedDefinition.set = noop
      } else {
        computedSharedDefinition.get = userDef.get
          ? userDef.cache !== false
            ? makeComputedGetter(userDef.get, vm)
            : bind(userDef.get, vm)
          : noop
        computedSharedDefinition.set = userDef.set
          ? bind(userDef.set, vm)
          : noop
      }
      Object.defineProperty(vm, key, computedSharedDefinition)
    }
  }
}

function makeComputedGetter (getter, owner) {
  var watcher = new Watcher(owner, getter, noop, {
    lazy: true
  })
  return function computedGetter () {
    if (watcher.dirty) {
      watcher.evaluate()
    }
    if (Dep.target) {
      watcher.depend()
    }
    return watcher.value
  }
}

function initMethods (vm) {
  var methods = vm.$options.methods
  if (methods) {
    for (var key in methods) {
      vm[key] = bind(methods[key], vm)
    }
  }
}

function initWatch (vm) {
  var watch = vm.$options.watch
  if (watch) {
    for (var key in watch) {
      var handler = watch[key]
      if (Array.isArray(handler)) {
        for (var i = 0; i < handler.length; i++) {
          createWatcher(vm, key, handler[i])
        }
      } else {
        createWatcher(vm, key, handler)
      }
    }
  }
}

function createWatcher (vm, key, handler) {
  var options
  if (isPlainObject(handler)) {
    options = handler
    handler = handler.handler
  }
  if (typeof handler === 'string') {
    handler = vm[handler]
  }
  vm.$watch(key, handler, options)
}

function stateMixin (Vue) {
  // flow somehow has problems with directly declared definition object
  // when using Object.defineProperty, so we have to procedurally build up
  // the object here.
  var dataDef = {}
  dataDef.get = function () {
    return this._data
  }
  if (process.env.NODE_ENV !== 'production') {
    dataDef.set = function (newData) {
      warn(
        'Avoid replacing instance root $data. ' +
        'Use nested data properties instead.',
        this
      )
    }
  }
  Object.defineProperty(Vue.prototype, '$data', dataDef)

  Vue.prototype.$set = set
  Vue.prototype.$delete = del

  Vue.prototype.$watch = function (
    expOrFn,
    cb,
    options
  ) {
    var vm = this
    options = options || {}
    options.user = true
    var watcher = new Watcher(vm, expOrFn, cb, options)
    if (options.immediate) {
      cb.call(vm, watcher.value)
    }
    return function unwatchFn () {
      watcher.teardown()
    }
  }
}

function proxy (vm, key) {
  if (!isReserved(key)) {
    Object.defineProperty(vm, key, {
      configurable: true,
      enumerable: true,
      get: function proxyGetter () {
        return vm._data[key]
      },
      set: function proxySetter (val) {
        vm._data[key] = val
      }
    })
  }
}

/*  */

var VNode = function VNode (
  tag,
  data,
  children,
  text,
  elm,
  ns,
  context,
  componentOptions
) {
  this.tag = tag
  this.data = data
  this.children = children
  this.text = text
  this.elm = elm
  this.ns = ns
  this.context = context
  this.key = data && data.key
  this.componentOptions = componentOptions
  this.child = undefined
  this.parent = undefined
  this.raw = false
  this.isStatic = false
  this.isRootInsert = true
  this.isComment = false
  this.isCloned = false
  // apply construct hook.
  // this is applied during render, before patch happens.
  // unlike other hooks, this is applied on both client and server.
  var constructHook = data && data.hook && data.hook.construct
  if (constructHook) {
    constructHook(this)
  }
};

var emptyVNode = function () {
  var node = new VNode()
  node.text = ''
  node.isComment = true
  return node
}

// optimized shallow clone
// used for static nodes and slot nodes because they may be reused across
// multiple renders, cloning them avoids errors when DOM manipulations rely
// on their elm reference.
function cloneVNode (vnode) {
  var cloned = new VNode(
    vnode.tag,
    vnode.data,
    vnode.children,
    vnode.text,
    vnode.elm,
    vnode.ns,
    vnode.context,
    vnode.componentOptions
  )
  cloned.isStatic = vnode.isStatic
  cloned.key = vnode.key
  cloned.isCloned = true
  return cloned
}

function cloneVNodes (vnodes) {
  var res = new Array(vnodes.length)
  for (var i = 0; i < vnodes.length; i++) {
    res[i] = cloneVNode(vnodes[i])
  }
  return res
}

/*  */

function normalizeChildren (
  children,
  ns,
  nestedIndex
) {
  if (isPrimitive(children)) {
    return [createTextVNode(children)]
  }
  if (Array.isArray(children)) {
    var res = []
    for (var i = 0, l = children.length; i < l; i++) {
      var c = children[i]
      var last = res[res.length - 1]
      //  nested
      if (Array.isArray(c)) {
        res.push.apply(res, normalizeChildren(c, ns, i))
      } else if (isPrimitive(c)) {
        if (last && last.text) {
          last.text += String(c)
        } else if (c !== '') {
          // convert primitive to vnode
          res.push(createTextVNode(c))
        }
      } else if (c instanceof VNode) {
        if (c.text && last && last.text) {
          last.text += c.text
        } else {
          // inherit parent namespace
          if (ns) {
            applyNS(c, ns)
          }
          // default key for nested array children (likely generated by v-for)
          if (c.key == null && nestedIndex != null) {
            c.key = "__vlist_" + nestedIndex + "_" + i + "__"
          }
          res.push(c)
        }
      }
    }
    return res
  }
}

function createTextVNode (val) {
  return new VNode(undefined, undefined, undefined, String(val))
}

function applyNS (vnode, ns) {
  if (vnode.tag && !vnode.ns) {
    vnode.ns = ns
    if (vnode.children) {
      for (var i = 0, l = vnode.children.length; i < l; i++) {
        applyNS(vnode.children[i], ns)
      }
    }
  }
}

function updateListeners (
  on,
  oldOn,
  add,
  remove
) {
  var name, cur, old, fn, event, capture
  for (name in on) {
    cur = on[name]
    old = oldOn[name]
    if (!cur) {
      process.env.NODE_ENV !== 'production' && warn(
        ("Handler for event \"" + name + "\" is undefined.")
      )
    } else if (!old) {
      capture = name.charAt(0) === '!'
      event = capture ? name.slice(1) : name
      if (Array.isArray(cur)) {
        add(event, (cur.invoker = arrInvoker(cur)), capture)
      } else {
        if (!cur.invoker) {
          fn = cur
          cur = on[name] = {}
          cur.fn = fn
          cur.invoker = fnInvoker(cur)
        }
        add(event, cur.invoker, capture)
      }
    } else if (cur !== old) {
      if (Array.isArray(old)) {
        old.length = cur.length
        for (var i = 0; i < old.length; i++) old[i] = cur[i]
        on[name] = old
      } else {
        old.fn = cur
        on[name] = old
      }
    }
  }
  for (name in oldOn) {
    if (!on[name]) {
      event = name.charAt(0) === '!' ? name.slice(1) : name
      remove(event, oldOn[name].invoker)
    }
  }
}

function arrInvoker (arr) {
  return function (ev) {
    var arguments$1 = arguments;

    var single = arguments.length === 1
    for (var i = 0; i < arr.length; i++) {
      single ? arr[i](ev) : arr[i].apply(null, arguments$1)
    }
  }
}

function fnInvoker (o) {
  return function (ev) {
    var single = arguments.length === 1
    single ? o.fn(ev) : o.fn.apply(null, arguments)
  }
}

/*  */

var activeInstance = null

function initLifecycle (vm) {
  var options = vm.$options

  // locate first non-abstract parent
  var parent = options.parent
  if (parent && !options.abstract) {
    while (parent.$options.abstract && parent.$parent) {
      parent = parent.$parent
    }
    parent.$children.push(vm)
  }

  vm.$parent = parent
  vm.$root = parent ? parent.$root : vm

  vm.$children = []
  vm.$refs = {}

  vm._watcher = null
  vm._inactive = false
  vm._isMounted = false
  vm._isDestroyed = false
  vm._isBeingDestroyed = false
}

function lifecycleMixin (Vue) {
  Vue.prototype._mount = function (
    el,
    hydrating
  ) {
    var vm = this
    vm.$el = el
    if (!vm.$options.render) {
      vm.$options.render = emptyVNode
      if (process.env.NODE_ENV !== 'production') {
        /* istanbul ignore if */
        if (vm.$options.template) {
          warn(
            'You are using the runtime-only build of Vue where the template ' +
            'option is not available. Either pre-compile the templates into ' +
            'render functions, or use the compiler-included build.',
            vm
          )
        } else {
          warn(
            'Failed to mount component: template or render function not defined.',
            vm
          )
        }
      }
    }
    callHook(vm, 'beforeMount')
    vm._watcher = new Watcher(vm, function () {
      vm._update(vm._render(), hydrating)
    }, noop)
    hydrating = false
    // root instance, call mounted on self
    // mounted is called for child components in its inserted hook
    if (vm.$root === vm) {
      vm._isMounted = true
      callHook(vm, 'mounted')
    }
    return vm
  }

  Vue.prototype._update = function (vnode, hydrating) {
    var vm = this
    if (vm._isMounted) {
      callHook(vm, 'beforeUpdate')
    }
    var prevEl = vm.$el
    var prevActiveInstance = activeInstance
    activeInstance = vm
    var prevVnode = vm._vnode
    vm._vnode = vnode
    if (!prevVnode) {
      // Vue.prototype.__patch__ is injected in entry points
      // based on the rendering backend used.
      vm.$el = vm.__patch__(vm.$el, vnode, hydrating)
    } else {
      vm.$el = vm.__patch__(prevVnode, vnode)
    }
    activeInstance = prevActiveInstance
    // update __vue__ reference
    if (prevEl) {
      prevEl.__vue__ = null
    }
    if (vm.$el) {
      vm.$el.__vue__ = vm
    }
    // if parent is an HOC, update its $el as well
    if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
      vm.$parent.$el = vm.$el
    }
    if (vm._isMounted) {
      callHook(vm, 'updated')
    }
  }

  Vue.prototype._updateFromParent = function (
    propsData,
    listeners,
    parentVnode,
    renderChildren
  ) {
    var vm = this
    var hasChildren = !!(vm.$options._renderChildren || renderChildren)
    vm.$options._parentVnode = parentVnode
    vm.$options._renderChildren = renderChildren
    // update props
    if (propsData && vm.$options.props) {
      observerState.shouldConvert = false
      if (process.env.NODE_ENV !== 'production') {
        observerState.isSettingProps = true
      }
      var propKeys = vm.$options._propKeys || []
      for (var i = 0; i < propKeys.length; i++) {
        var key = propKeys[i]
        vm[key] = validateProp(key, vm.$options.props, propsData, vm)
      }
      observerState.shouldConvert = true
      if (process.env.NODE_ENV !== 'production') {
        observerState.isSettingProps = false
      }
    }
    // update listeners
    if (listeners) {
      var oldListeners = vm.$options._parentListeners
      vm.$options._parentListeners = listeners
      vm._updateListeners(listeners, oldListeners)
    }
    // resolve slots + force update if has children
    if (hasChildren) {
      vm.$slots = resolveSlots(renderChildren)
      vm.$forceUpdate()
    }
  }

  Vue.prototype.$forceUpdate = function () {
    var vm = this
    if (vm._watcher) {
      vm._watcher.update()
    }
  }

  Vue.prototype.$destroy = function () {
    var vm = this
    if (vm._isBeingDestroyed) {
      return
    }
    callHook(vm, 'beforeDestroy')
    vm._isBeingDestroyed = true
    // remove self from parent
    var parent = vm.$parent
    if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
      remove(parent.$children, vm)
    }
    // teardown watchers
    if (vm._watcher) {
      vm._watcher.teardown()
    }
    var i = vm._watchers.length
    while (i--) {
      vm._watchers[i].teardown()
    }
    // remove reference from data ob
    // frozen object may not have observer.
    if (vm._data.__ob__) {
      vm._data.__ob__.vmCount--
    }
    // call the last hook...
    vm._isDestroyed = true
    callHook(vm, 'destroyed')
    // turn off all instance listeners.
    vm.$off()
    // remove __vue__ reference
    if (vm.$el) {
      vm.$el.__vue__ = null
    }
  }
}

function callHook (vm, hook) {
  var handlers = vm.$options[hook]
  if (handlers) {
    for (var i = 0, j = handlers.length; i < j; i++) {
      handlers[i].call(vm)
    }
  }
  vm.$emit('hook:' + hook)
}

/*  */

var hooks = { init: init, prepatch: prepatch, insert: insert, destroy: destroy }
var hooksToMerge = Object.keys(hooks)

function createComponent (
  Ctor,
  data,
  context,
  children,
  tag
) {
  if (!Ctor) {
    return
  }

  if (isObject(Ctor)) {
    Ctor = Vue.extend(Ctor)
  }

  if (typeof Ctor !== 'function') {
    if (process.env.NODE_ENV !== 'production') {
      warn(("Invalid Component definition: " + (String(Ctor))), context)
    }
    return
  }

  // async component
  if (!Ctor.cid) {
    if (Ctor.resolved) {
      Ctor = Ctor.resolved
    } else {
      Ctor = resolveAsyncComponent(Ctor, function () {
        // it's ok to queue this on every render because
        // $forceUpdate is buffered by the scheduler.
        context.$forceUpdate()
      })
      if (!Ctor) {
        // return nothing if this is indeed an async component
        // wait for the callback to trigger parent update.
        return
      }
    }
  }

  data = data || {}

  // extract props
  var propsData = extractProps(data, Ctor)

  // functional component
  if (Ctor.options.functional) {
    return createFunctionalComponent(Ctor, propsData, data, context, children)
  }

  // extract listeners, since these needs to be treated as
  // child component listeners instead of DOM listeners
  var listeners = data.on
  // replace with listeners with .native modifier
  data.on = data.nativeOn

  if (Ctor.options.abstract) {
    // abstract components do not keep anything
    // other than props & listeners
    data = {}
  }

  // merge component management hooks onto the placeholder node
  mergeHooks(data)

  // return a placeholder vnode
  var name = Ctor.options.name || tag
  var vnode = new VNode(
    ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
    data, undefined, undefined, undefined, undefined, context,
    { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children }
  )
  return vnode
}

function createFunctionalComponent (
  Ctor,
  propsData,
  data,
  context,
  children
) {
  var props = {}
  var propOptions = Ctor.options.props
  if (propOptions) {
    for (var key in propOptions) {
      props[key] = validateProp(key, propOptions, propsData)
    }
  }
  return Ctor.options.render.call(
    null,
    context.$createElement,
    {
      props: props,
      data: data,
      parent: context,
      children: normalizeChildren(children),
      slots: function () { return resolveSlots(children); }
    }
  )
}

function createComponentInstanceForVnode (
  vnode, // we know it's MountedComponentVNode but flow doesn't
  parent // activeInstance in lifecycle state
) {
  var vnodeComponentOptions = vnode.componentOptions
  var options = {
    _isComponent: true,
    parent: parent,
    propsData: vnodeComponentOptions.propsData,
    _componentTag: vnodeComponentOptions.tag,
    _parentVnode: vnode,
    _parentListeners: vnodeComponentOptions.listeners,
    _renderChildren: vnodeComponentOptions.children
  }
  // check inline-template render functions
  var inlineTemplate = vnode.data.inlineTemplate
  if (inlineTemplate) {
    options.render = inlineTemplate.render
    options.staticRenderFns = inlineTemplate.staticRenderFns
  }
  return new vnodeComponentOptions.Ctor(options)
}

function init (vnode, hydrating) {
  if (!vnode.child || vnode.child._isDestroyed) {
    var child = vnode.child = createComponentInstanceForVnode(vnode, activeInstance)
    child.$mount(hydrating ? vnode.elm : undefined, hydrating)
  }
}

function prepatch (
  oldVnode,
  vnode
) {
  var options = vnode.componentOptions
  var child = vnode.child = oldVnode.child
  child._updateFromParent(
    options.propsData, // updated props
    options.listeners, // updated listeners
    vnode, // new parent vnode
    options.children // new children
  )
}

function insert (vnode) {
  if (!vnode.child._isMounted) {
    vnode.child._isMounted = true
    callHook(vnode.child, 'mounted')
  }
  if (vnode.data.keepAlive) {
    vnode.child._inactive = false
    callHook(vnode.child, 'activated')
  }
}

function destroy (vnode) {
  if (!vnode.child._isDestroyed) {
    if (!vnode.data.keepAlive) {
      vnode.child.$destroy()
    } else {
      vnode.child._inactive = true
      callHook(vnode.child, 'deactivated')
    }
  }
}

function resolveAsyncComponent (
  factory,
  cb
) {
  if (factory.requested) {
    // pool callbacks
    factory.pendingCallbacks.push(cb)
  } else {
    factory.requested = true
    var cbs = factory.pendingCallbacks = [cb]
    var sync = true

    var resolve = function (res) {
      if (isObject(res)) {
        res = Vue.extend(res)
      }
      // cache resolved
      factory.resolved = res
      // invoke callbacks only if this is not a synchronous resolve
      // (async resolves are shimmed as synchronous during SSR)
      if (!sync) {
        for (var i = 0, l = cbs.length; i < l; i++) {
          cbs[i](res)
        }
      }
    }

    var reject = function (reason) {
      process.env.NODE_ENV !== 'production' && warn(
        "Failed to resolve async component: " + (String(factory)) +
        (reason ? ("\nReason: " + reason) : '')
      )
    }

    var res = factory(resolve, reject)

    // handle promise
    if (res && typeof res.then === 'function' && !factory.resolved) {
      res.then(resolve, reject)
    }

    sync = false
    // return in case resolved synchronously
    return factory.resolved
  }
}

function extractProps (data, Ctor) {
  // we are only extrating raw values here.
  // validation and default values are handled in the child
  // component itself.
  var propOptions = Ctor.options.props
  if (!propOptions) {
    return
  }
  var res = {}
  var attrs = data.attrs;
  var props = data.props;
  var domProps = data.domProps;
  if (attrs || props || domProps) {
    for (var key in propOptions) {
      var altKey = hyphenate(key)
      checkProp(res, props, key, altKey, true) ||
      checkProp(res, attrs, key, altKey) ||
      checkProp(res, domProps, key, altKey)
    }
  }
  return res
}

function checkProp (
  res,
  hash,
  key,
  altKey,
  preserve
) {
  if (hash) {
    if (hasOwn(hash, key)) {
      res[key] = hash[key]
      if (!preserve) {
        delete hash[key]
      }
      return true
    } else if (hasOwn(hash, altKey)) {
      res[key] = hash[altKey]
      if (!preserve) {
        delete hash[altKey]
      }
      return true
    }
  }
  return false
}

function mergeHooks (data) {
  if (!data.hook) {
    data.hook = {}
  }
  for (var i = 0; i < hooksToMerge.length; i++) {
    var key = hooksToMerge[i]
    var fromParent = data.hook[key]
    var ours = hooks[key]
    data.hook[key] = fromParent ? mergeHook$1(ours, fromParent) : ours
  }
}

function mergeHook$1 (a, b) {
  // since all hooks have at most two args, use fixed args
  // to avoid having to use fn.apply().
  return function (_, __) {
    a(_, __)
    b(_, __)
  }
}

/*  */

// wrapper function for providing a more flexible interface
// without getting yelled at by flow
function createElement (
  tag,
  data,
  children
) {
  if (data && (Array.isArray(data) || typeof data !== 'object')) {
    children = data
    data = undefined
  }
  // make sure to use real instance instead of proxy as context
  return _createElement(this._self, tag, data, children)
}

function _createElement (
  context,
  tag,
  data,
  children
) {
  if (data && data.__ob__) {
    process.env.NODE_ENV !== 'production' && warn(
      "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
      'Always create fresh vnode data objects in each render!',
      context
    )
    return
  }
  if (!tag) {
    // in case of component :is set to falsy value
    return emptyVNode()
  }
  if (typeof tag === 'string') {
    var Ctor
    var ns = config.getTagNamespace(tag)
    if (config.isReservedTag(tag)) {
      // platform built-in elements
      return new VNode(
        tag, data, normalizeChildren(children, ns),
        undefined, undefined, ns, context
      )
    } else if ((Ctor = resolveAsset(context.$options, 'components', tag))) {
      // component
      return createComponent(Ctor, data, context, children, tag)
    } else {
      // unknown or unlisted namespaced elements
      // check at runtime because it may get assigned a namespace when its
      // parent normalizes children
      return new VNode(
        tag, data, normalizeChildren(children, ns),
        undefined, undefined, ns, context
      )
    }
  } else {
    // direct component options / constructor
    return createComponent(tag, data, context, children)
  }
}

/*  */

function initRender (vm) {
  vm.$vnode = null // the placeholder node in parent tree
  vm._vnode = null // the root of the child tree
  vm._staticTrees = null
  vm.$slots = resolveSlots(vm.$options._renderChildren)
  // bind the public createElement fn to this instance
  // so that we get proper render context inside it.
  vm.$createElement = bind(createElement, vm)
  if (vm.$options.el) {
    vm.$mount(vm.$options.el)
  }
}

function renderMixin (Vue) {
  Vue.prototype.$nextTick = function (fn) {
    nextTick(fn, this)
  }

  Vue.prototype._render = function () {
    var vm = this
    var ref = vm.$options;
    var render = ref.render;
    var staticRenderFns = ref.staticRenderFns;
    var _parentVnode = ref._parentVnode;

    if (staticRenderFns && !vm._staticTrees) {
      vm._staticTrees = []
    }
    // set parent vnode. this allows render functions to have access
    // to the data on the placeholder node.
    vm.$vnode = _parentVnode
    // render self
    var vnode
    try {
      vnode = render.call(vm._renderProxy, vm.$createElement)
    } catch (e) {
      if (process.env.NODE_ENV !== 'production') {
        warn(("Error when rendering " + (formatComponentName(vm)) + ":"))
      }
      /* istanbul ignore else */
      if (config.errorHandler) {
        config.errorHandler.call(null, e, vm)
      } else {
        if (config._isServer) {
          throw e
        } else {
          setTimeout(function () { throw e }, 0)
        }
      }
      // return previous vnode to prevent render error causing blank component
      vnode = vm._vnode
    }
    // return empty vnode in case the render function errored out
    if (!(vnode instanceof VNode)) {
      if (process.env.NODE_ENV !== 'production' && Array.isArray(vnode)) {
        warn(
          'Multiple root nodes returned from render function. Render function ' +
          'should return a single root node.',
          vm
        )
      }
      vnode = emptyVNode()
    }
    // set parent
    vnode.parent = _parentVnode
    return vnode
  }

  // shorthands used in render functions
  Vue.prototype._h = createElement
  // toString for mustaches
  Vue.prototype._s = _toString
  // number conversion
  Vue.prototype._n = toNumber
  // empty vnode
  Vue.prototype._e = emptyVNode

  // render static tree by index
  Vue.prototype._m = function renderStatic (
    index,
    isInFor
  ) {
    var tree = this._staticTrees[index]
    // if has already-rendered static tree and not inside v-for,
    // we can reuse the same tree by doing a shallow clone.
    if (tree && !isInFor) {
      return Array.isArray(tree)
        ? cloneVNodes(tree)
        : cloneVNode(tree)
    }
    // otherwise, render a fresh tree.
    tree = this._staticTrees[index] = this.$options.staticRenderFns[index].call(this._renderProxy)
    if (Array.isArray(tree)) {
      for (var i = 0; i < tree.length; i++) {
        tree[i].isStatic = true
        tree[i].key = "__static__" + index + "_" + i
      }
    } else {
      tree.isStatic = true
      tree.key = "__static__" + index
    }
    return tree
  }

  // filter resolution helper
  var identity = function (_) { return _; }
  Vue.prototype._f = function resolveFilter (id) {
    return resolveAsset(this.$options, 'filters', id, true) || identity
  }

  // render v-for
  Vue.prototype._l = function renderList (
    val,
    render
  ) {
    var ret, i, l, keys, key
    if (Array.isArray(val)) {
      ret = new Array(val.length)
      for (i = 0, l = val.length; i < l; i++) {
        ret[i] = render(val[i], i)
      }
    } else if (typeof val === 'number') {
      ret = new Array(val)
      for (i = 0; i < val; i++) {
        ret[i] = render(i + 1, i)
      }
    } else if (isObject(val)) {
      keys = Object.keys(val)
      ret = new Array(keys.length)
      for (i = 0, l = keys.length; i < l; i++) {
        key = keys[i]
        ret[i] = render(val[key], key, i)
      }
    }
    return ret
  }

  // renderSlot
  Vue.prototype._t = function (
    name,
    fallback
  ) {
    var slotNodes = this.$slots[name]
    if (slotNodes) {
      // warn duplicate slot usage
      if (process.env.NODE_ENV !== 'production') {
        slotNodes._rendered && warn(
          "Duplicate presense of slot \"" + name + "\" found in the same render tree " +
          "- this will likely cause render errors.",
          this
        )
        slotNodes._rendered = true
      }
      // clone slot nodes on re-renders
      if (this._isMounted) {
        slotNodes = cloneVNodes(slotNodes)
      }
    }
    return slotNodes || fallback
  }

  // apply v-bind object
  Vue.prototype._b = function bindProps (
    vnode,
    value,
    asProp) {
    if (value) {
      if (!isObject(value)) {
        process.env.NODE_ENV !== 'production' && warn(
          'v-bind without argument expects an Object or Array value',
          this
        )
      } else {
        if (Array.isArray(value)) {
          value = toObject(value)
        }
        var data = vnode.data
        for (var key in value) {
          if (key === 'class' || key === 'style') {
            data[key] = value[key]
          } else {
            var hash = asProp || config.mustUseProp(key)
              ? data.domProps || (data.domProps = {})
              : data.attrs || (data.attrs = {})
            hash[key] = value[key]
          }
        }
      }
    }
  }

  // expose v-on keyCodes
  Vue.prototype._k = function getKeyCodes (key) {
    return config.keyCodes[key]
  }
}

function resolveSlots (
  renderChildren
) {
  var slots = {}
  if (!renderChildren) {
    return slots
  }
  var children = normalizeChildren(renderChildren) || []
  var defaultSlot = []
  var name, child
  for (var i = 0, l = children.length; i < l; i++) {
    child = children[i]
    if (child.data && (name = child.data.slot)) {
      delete child.data.slot
      var slot = (slots[name] || (slots[name] = []))
      if (child.tag === 'template') {
        slot.push.apply(slot, child.children)
      } else {
        slot.push(child)
      }
    } else {
      defaultSlot.push(child)
    }
  }
  // ignore single whitespace
  if (defaultSlot.length && !(
    defaultSlot.length === 1 &&
    (defaultSlot[0].text === ' ' || defaultSlot[0].isComment)
  )) {
    slots.default = defaultSlot
  }
  return slots
}

/*  */

function initEvents (vm) {
  vm._events = Object.create(null)
  // init parent attached events
  var listeners = vm.$options._parentListeners
  var on = bind(vm.$on, vm)
  var off = bind(vm.$off, vm)
  vm._updateListeners = function (listeners, oldListeners) {
    updateListeners(listeners, oldListeners || {}, on, off)
  }
  if (listeners) {
    vm._updateListeners(listeners)
  }
}

function eventsMixin (Vue) {
  Vue.prototype.$on = function (event, fn) {
    var vm = this
    ;(vm._events[event] || (vm._events[event] = [])).push(fn)
    return vm
  }

  Vue.prototype.$once = function (event, fn) {
    var vm = this
    function on () {
      vm.$off(event, on)
      fn.apply(vm, arguments)
    }
    on.fn = fn
    vm.$on(event, on)
    return vm
  }

  Vue.prototype.$off = function (event, fn) {
    var vm = this
    // all
    if (!arguments.length) {
      vm._events = Object.create(null)
      return vm
    }
    // specific event
    var cbs = vm._events[event]
    if (!cbs) {
      return vm
    }
    if (arguments.length === 1) {
      vm._events[event] = null
      return vm
    }
    // specific handler
    var cb
    var i = cbs.length
    while (i--) {
      cb = cbs[i]
      if (cb === fn || cb.fn === fn) {
        cbs.splice(i, 1)
        break
      }
    }
    return vm
  }

  Vue.prototype.$emit = function (event) {
    var vm = this
    var cbs = vm._events[event]
    if (cbs) {
      cbs = cbs.length > 1 ? toArray(cbs) : cbs
      var args = toArray(arguments, 1)
      for (var i = 0, l = cbs.length; i < l; i++) {
        cbs[i].apply(vm, args)
      }
    }
    return vm
  }
}

/*  */

var uid = 0

function initMixin (Vue) {
  Vue.prototype._init = function (options) {
    var vm = this
    // a uid
    vm._uid = uid++
    // a flag to avoid this being observed
    vm._isVue = true
    // merge options
    if (options && options._isComponent) {
      // optimize internal component instantiation
      // since dynamic options merging is pretty slow, and none of the
      // internal component options needs special treatment.
      initInternalComponent(vm, options)
    } else {
      vm.$options = mergeOptions(
        resolveConstructorOptions(vm),
        options || {},
        vm
      )
    }
    /* istanbul ignore else */
    if (process.env.NODE_ENV !== 'production') {
      initProxy(vm)
    } else {
      vm._renderProxy = vm
    }
    // expose real self
    vm._self = vm
    initLifecycle(vm)
    initEvents(vm)
    callHook(vm, 'beforeCreate')
    initState(vm)
    callHook(vm, 'created')
    initRender(vm)
  }

  function initInternalComponent (vm, options) {
    var opts = vm.$options = Object.create(resolveConstructorOptions(vm))
    // doing this because it's faster than dynamic enumeration.
    opts.parent = options.parent
    opts.propsData = options.propsData
    opts._parentVnode = options._parentVnode
    opts._parentListeners = options._parentListeners
    opts._renderChildren = options._renderChildren
    opts._componentTag = options._componentTag
    if (options.render) {
      opts.render = options.render
      opts.staticRenderFns = options.staticRenderFns
    }
  }

  function resolveConstructorOptions (vm) {
    var Ctor = vm.constructor
    var options = Ctor.options
    if (Ctor.super) {
      var superOptions = Ctor.super.options
      var cachedSuperOptions = Ctor.superOptions
      if (superOptions !== cachedSuperOptions) {
        // super option changed
        Ctor.superOptions = superOptions
        options = Ctor.options = mergeOptions(superOptions, Ctor.extendOptions)
        if (options.name) {
          options.components[options.name] = Ctor
        }
      }
    }
    return options
  }
}

function Vue (options) {
  this._init(options)
}

initMixin(Vue)
stateMixin(Vue)
eventsMixin(Vue)
lifecycleMixin(Vue)
renderMixin(Vue)

/*  */

/**
 * Option overwriting strategies are functions that handle
 * how to merge a parent option value and a child option
 * value into the final value.
 */
var strats = config.optionMergeStrategies

/**
 * Options with restrictions
 */
if (process.env.NODE_ENV !== 'production') {
  strats.el = strats.propsData = function (parent, child, vm, key) {
    if (!vm) {
      warn(
        "option \"" + key + "\" can only be used during instance " +
        'creation with the `new` keyword.'
      )
    }
    return defaultStrat(parent, child)
  }

  strats.name = function (parent, child, vm) {
    if (vm && child) {
      warn(
        'options "name" can only be used as a component definition option, ' +
        'not during instance creation.'
      )
    }
    return defaultStrat(parent, child)
  }
}

/**
 * Helper that recursively merges two data objects together.
 */
function mergeData (to, from) {
  var key, toVal, fromVal
  for (key in from) {
    toVal = to[key]
    fromVal = from[key]
    if (!hasOwn(to, key)) {
      set(to, key, fromVal)
    } else if (isObject(toVal) && isObject(fromVal)) {
      mergeData(toVal, fromVal)
    }
  }
  return to
}

/**
 * Data
 */
strats.data = function (
  parentVal,
  childVal,
  vm
) {
  if (!vm) {
    // in a Vue.extend merge, both should be functions
    if (!childVal) {
      return parentVal
    }
    if (typeof childVal !== 'function') {
      process.env.NODE_ENV !== 'production' && warn(
        'The "data" option should be a function ' +
        'that returns a per-instance value in component ' +
        'definitions.',
        vm
      )
      return parentVal
    }
    if (!parentVal) {
      return childVal
    }
    // when parentVal & childVal are both present,
    // we need to return a function that returns the
    // merged result of both functions... no need to
    // check if parentVal is a function here because
    // it has to be a function to pass previous merges.
    return function mergedDataFn () {
      return mergeData(
        childVal.call(this),
        parentVal.call(this)
      )
    }
  } else if (parentVal || childVal) {
    return function mergedInstanceDataFn () {
      // instance merge
      var instanceData = typeof childVal === 'function'
        ? childVal.call(vm)
        : childVal
      var defaultData = typeof parentVal === 'function'
        ? parentVal.call(vm)
        : undefined
      if (instanceData) {
        return mergeData(instanceData, defaultData)
      } else {
        return defaultData
      }
    }
  }
}

/**
 * Hooks and param attributes are merged as arrays.
 */
function mergeHook (
  parentVal,
  childVal
) {
  return childVal
    ? parentVal
      ? parentVal.concat(childVal)
      : Array.isArray(childVal)
        ? childVal
        : [childVal]
    : parentVal
}

config._lifecycleHooks.forEach(function (hook) {
  strats[hook] = mergeHook
})

/**
 * Assets
 *
 * When a vm is present (instance creation), we need to do
 * a three-way merge between constructor options, instance
 * options and parent options.
 */
function mergeAssets (parentVal, childVal) {
  var res = Object.create(parentVal || null)
  return childVal
    ? extend(res, childVal)
    : res
}

config._assetTypes.forEach(function (type) {
  strats[type + 's'] = mergeAssets
})

/**
 * Watchers.
 *
 * Watchers hashes should not overwrite one
 * another, so we merge them as arrays.
 */
strats.watch = function (parentVal, childVal) {
  /* istanbul ignore if */
  if (!childVal) return parentVal
  if (!parentVal) return childVal
  var ret = {}
  extend(ret, parentVal)
  for (var key in childVal) {
    var parent = ret[key]
    var child = childVal[key]
    if (parent && !Array.isArray(parent)) {
      parent = [parent]
    }
    ret[key] = parent
      ? parent.concat(child)
      : [child]
  }
  return ret
}

/**
 * Other object hashes.
 */
strats.props =
strats.methods =
strats.computed = function (parentVal, childVal) {
  if (!childVal) return parentVal
  if (!parentVal) return childVal
  var ret = Object.create(null)
  extend(ret, parentVal)
  extend(ret, childVal)
  return ret
}

/**
 * Default strategy.
 */
var defaultStrat = function (parentVal, childVal) {
  return childVal === undefined
    ? parentVal
    : childVal
}

/**
 * Make sure component options get converted to actual
 * constructors.
 */
function normalizeComponents (options) {
  if (options.components) {
    var components = options.components
    var def
    for (var key in components) {
      var lower = key.toLowerCase()
      if (isBuiltInTag(lower) || config.isReservedTag(lower)) {
        process.env.NODE_ENV !== 'production' && warn(
          'Do not use built-in or reserved HTML elements as component ' +
          'id: ' + key
        )
        continue
      }
      def = components[key]
      if (isPlainObject(def)) {
        components[key] = Vue.extend(def)
      }
    }
  }
}

/**
 * Ensure all props option syntax are normalized into the
 * Object-based format.
 */
function normalizeProps (options) {
  var props = options.props
  if (!props) return
  var res = {}
  var i, val, name
  if (Array.isArray(props)) {
    i = props.length
    while (i--) {
      val = props[i]
      if (typeof val === 'string') {
        name = camelize(val)
        res[name] = { type: null }
      } else if (process.env.NODE_ENV !== 'production') {
        warn('props must be strings when using array syntax.')
      }
    }
  } else if (isPlainObject(props)) {
    for (var key in props) {
      val = props[key]
      name = camelize(key)
      res[name] = isPlainObject(val)
        ? val
        : { type: val }
    }
  }
  options.props = res
}

/**
 * Normalize raw function directives into object format.
 */
function normalizeDirectives (options) {
  var dirs = options.directives
  if (dirs) {
    for (var key in dirs) {
      var def = dirs[key]
      if (typeof def === 'function') {
        dirs[key] = { bind: def, update: def }
      }
    }
  }
}

/**
 * Merge two option objects into a new one.
 * Core utility used in both instantiation and inheritance.
 */
function mergeOptions (
  parent,
  child,
  vm
) {
  normalizeComponents(child)
  normalizeProps(child)
  normalizeDirectives(child)
  var extendsFrom = child.extends
  if (extendsFrom) {
    parent = typeof extendsFrom === 'function'
      ? mergeOptions(parent, extendsFrom.options, vm)
      : mergeOptions(parent, extendsFrom, vm)
  }
  if (child.mixins) {
    for (var i = 0, l = child.mixins.length; i < l; i++) {
      var mixin = child.mixins[i]
      if (mixin.prototype instanceof Vue) {
        mixin = mixin.options
      }
      parent = mergeOptions(parent, mixin, vm)
    }
  }
  var options = {}
  var key
  for (key in parent) {
    mergeField(key)
  }
  for (key in child) {
    if (!hasOwn(parent, key)) {
      mergeField(key)
    }
  }
  function mergeField (key) {
    var strat = strats[key] || defaultStrat
    options[key] = strat(parent[key], child[key], vm, key)
  }
  return options
}

/**
 * Resolve an asset.
 * This function is used because child instances need access
 * to assets defined in its ancestor chain.
 */
function resolveAsset (
  options,
  type,
  id,
  warnMissing
) {
  /* istanbul ignore if */
  if (typeof id !== 'string') {
    return
  }
  var assets = options[type]
  var res = assets[id] ||
    // camelCase ID
    assets[camelize(id)] ||
    // Pascal Case ID
    assets[capitalize(camelize(id))]
  if (process.env.NODE_ENV !== 'production' && warnMissing && !res) {
    warn(
      'Failed to resolve ' + type.slice(0, -1) + ': ' + id,
      options
    )
  }
  return res
}

/*  */

function validateProp (
  key,
  propOptions,
  propsData,
  vm
) {
  /* istanbul ignore if */
  if (!propsData) return
  var prop = propOptions[key]
  var absent = !hasOwn(propsData, key)
  var value = propsData[key]
  // handle boolean props
  if (getType(prop.type) === 'Boolean') {
    if (absent && !hasOwn(prop, 'default')) {
      value = false
    } else if (value === '' || value === hyphenate(key)) {
      value = true
    }
  }
  // check default value
  if (value === undefined) {
    value = getPropDefaultValue(vm, prop, key)
    // since the default value is a fresh copy,
    // make sure to observe it.
    var prevShouldConvert = observerState.shouldConvert
    observerState.shouldConvert = true
    observe(value)
    observerState.shouldConvert = prevShouldConvert
  }
  if (process.env.NODE_ENV !== 'production') {
    assertProp(prop, key, value, vm, absent)
  }
  return value
}

/**
 * Get the default value of a prop.
 */
function getPropDefaultValue (vm, prop, name) {
  // no default, return undefined
  if (!hasOwn(prop, 'default')) {
    return undefined
  }
  var def = prop.default
  // warn against non-factory defaults for Object & Array
  if (isObject(def)) {
    process.env.NODE_ENV !== 'production' && warn(
      'Invalid default value for prop "' + name + '": ' +
      'Props with type Object/Array must use a factory function ' +
      'to return the default value.',
      vm
    )
  }
  // call factory function for non-Function types
  return typeof def === 'function' && prop.type !== Function
    ? def.call(vm)
    : def
}

/**
 * Assert whether a prop is valid.
 */
function assertProp (
  prop,
  name,
  value,
  vm,
  absent
) {
  if (prop.required && absent) {
    warn(
      'Missing required prop: "' + name + '"',
      vm
    )
    return
  }
  if (value == null && !prop.required) {
    return
  }
  var type = prop.type
  var valid = !type
  var expectedTypes = []
  if (type) {
    if (!Array.isArray(type)) {
      type = [type]
    }
    for (var i = 0; i < type.length && !valid; i++) {
      var assertedType = assertType(value, type[i])
      expectedTypes.push(assertedType.expectedType)
      valid = assertedType.valid
    }
  }
  if (!valid) {
    warn(
      'Invalid prop: type check failed for prop "' + name + '".' +
      ' Expected ' + expectedTypes.map(capitalize).join(', ') +
      ', got ' + Object.prototype.toString.call(value).slice(8, -1) + '.',
      vm
    )
    return
  }
  var validator = prop.validator
  if (validator) {
    if (!validator(value)) {
      warn(
        'Invalid prop: custom validator check failed for prop "' + name + '".',
        vm
      )
    }
  }
}

/**
 * Assert the type of a value
 */
function assertType (value, type) {
  var valid
  var expectedType = getType(type)
  if (expectedType === 'String') {
    valid = typeof value === (expectedType = 'string')
  } else if (expectedType === 'Number') {
    valid = typeof value === (expectedType = 'number')
  } else if (expectedType === 'Boolean') {
    valid = typeof value === (expectedType = 'boolean')
  } else if (expectedType === 'Function') {
    valid = typeof value === (expectedType = 'function')
  } else if (expectedType === 'Object') {
    valid = isPlainObject(value)
  } else if (expectedType === 'Array') {
    valid = Array.isArray(value)
  } else {
    valid = value instanceof type
  }
  return {
    valid: valid,
    expectedType: expectedType
  }
}

/**
 * Use function string name to check built-in types,
 * because a simple equality check will fail when running
 * across different vms / iframes.
 */
function getType (fn) {
  var match = fn && fn.toString().match(/^\s*function (\w+)/)
  return match && match[1]
}

/*  */

// attributes that should be using props for binding
var mustUseProp = makeMap('value,selected,checked,muted')

var isEnumeratedAttr = makeMap('contenteditable,draggable,spellcheck')

var isBooleanAttr = makeMap(
  'allowfullscreen,async,autofocus,autoplay,checked,compact,controls,declare,' +
  'default,defaultchecked,defaultmuted,defaultselected,defer,disabled,' +
  'enabled,formnovalidate,hidden,indeterminate,inert,ismap,itemscope,loop,multiple,' +
  'muted,nohref,noresize,noshade,novalidate,nowrap,open,pauseonexit,readonly,' +
  'required,reversed,scoped,seamless,selected,sortable,translate,' +
  'truespeed,typemustmatch,visible'
)

var isAttr = makeMap(
  'accept,accept-charset,accesskey,action,align,alt,async,autocomplete,' +
  'autofocus,autoplay,autosave,bgcolor,border,buffered,challenge,charset,' +
  'checked,cite,class,code,codebase,color,cols,colspan,content,http-equiv,' +
  'name,contenteditable,contextmenu,controls,coords,data,datetime,default,' +
  'defer,dir,dirname,disabled,download,draggable,dropzone,enctype,method,for,' +
  'form,formaction,headers,<th>,height,hidden,high,href,hreflang,http-equiv,' +
  'icon,id,ismap,itemprop,keytype,kind,label,lang,language,list,loop,low,' +
  'manifest,max,maxlength,media,method,GET,POST,min,multiple,email,file,' +
  'muted,name,novalidate,open,optimum,pattern,ping,placeholder,poster,' +
  'preload,radiogroup,readonly,rel,required,reversed,rows,rowspan,sandbox,' +
  'scope,scoped,seamless,selected,shape,size,type,text,password,sizes,span,' +
  'spellcheck,src,srcdoc,srclang,srcset,start,step,style,summary,tabindex,' +
  'target,title,type,usemap,value,width,wrap'
)

/*  */

/*  */

var isHTMLTag = makeMap(
  'html,body,base,head,link,meta,style,title,' +
  'address,article,aside,footer,header,h1,h2,h3,h4,h5,h6,hgroup,nav,section,' +
  'div,dd,dl,dt,figcaption,figure,hr,img,li,main,ol,p,pre,ul,' +
  'a,b,abbr,bdi,bdo,br,cite,code,data,dfn,em,i,kbd,mark,q,rp,rt,rtc,ruby,' +
  's,samp,small,span,strong,sub,sup,time,u,var,wbr,area,audio,map,track,video,' +
  'embed,object,param,source,canvas,script,noscript,del,ins,' +
  'caption,col,colgroup,table,thead,tbody,td,th,tr,' +
  'button,datalist,fieldset,form,input,label,legend,meter,optgroup,option,' +
  'output,progress,select,textarea,' +
  'details,dialog,menu,menuitem,summary,' +
  'content,element,shadow,template'
)

var isUnaryTag = makeMap(
  'area,base,br,col,embed,frame,hr,img,input,isindex,keygen,' +
  'link,meta,param,source,track,wbr',
  true
)

// Elements that you can, intentionally, leave open
// (and which close themselves)
var canBeLeftOpenTag = makeMap(
  'colgroup,dd,dt,li,options,p,td,tfoot,th,thead,tr,source',
  true
)

// HTML5 tags https://html.spec.whatwg.org/multipage/indices.html#elements-3
// Phrasing Content https://html.spec.whatwg.org/multipage/dom.html#phrasing-content
var isNonPhrasingTag = makeMap(
  'address,article,aside,base,blockquote,body,caption,col,colgroup,dd,' +
  'details,dialog,div,dl,dt,fieldset,figcaption,figure,footer,form,' +
  'h1,h2,h3,h4,h5,h6,head,header,hgroup,hr,html,legend,li,menuitem,meta,' +
  'optgroup,option,param,rp,rt,source,style,summary,tbody,td,tfoot,th,thead,' +
  'title,tr,track',
  true
)

// this map is intentionally selective, only covering SVG elements that may
// contain child elements.
var isSVG = makeMap(
  'svg,animate,circle,clippath,cursor,defs,desc,ellipse,filter,font,' +
  'font-face,g,glyph,image,line,marker,mask,missing-glyph,path,pattern,' +
  'polygon,polyline,rect,switch,symbol,text,textpath,tspan,use,view',
  true
)

var isPreTag = function (tag) { return tag === 'pre'; }

var isReservedTag = function (tag) {
  return isHTMLTag(tag) || isSVG(tag)
}

function getTagNamespace (tag) {
  if (isSVG(tag)) {
    return 'svg'
  }
  // basic support for MathML
  // note it doesn't support other MathML elements being component roots
  if (tag === 'math') {
    return 'math'
  }
}

/*  */

var UA = inBrowser && window.navigator.userAgent.toLowerCase()
var isIE = UA && /msie|trident/.test(UA)
var isIE9 = UA && UA.indexOf('msie 9.0') > 0
var isAndroid = UA && UA.indexOf('android') > 0

// According to
// https://w3c.github.io/DOM-Parsing/#dfn-serializing-an-attribute-value
// when serializing innerHTML, <, >, ", & should be encoded as entities.
// However, only some browsers, e.g. PhantomJS, encodes < and >.
// this causes problems with the in-browser parser.
var shouldDecodeTags = inBrowser ? (function () {
  var div = document.createElement('div')
  div.innerHTML = '<div a=">">'
  return div.innerHTML.indexOf('&gt;') > 0
})() : false

/**
 * Not type-checking this file because it's mostly vendor code.
 */

/*!
 * HTML Parser By John Resig (ejohn.org)
 * Modified by Juriy "kangax" Zaytsev
 * Original code by Erik Arvidsson, Mozilla Public License
 * http://erik.eae.net/simplehtmlparser/simplehtmlparser.js
 */

// Regular Expressions for parsing tags and attributes
var singleAttrIdentifier = /([^\s"'<>\/=]+)/
var singleAttrAssign = /(?:=)/
var singleAttrValues = [
  // attr value double quotes
  /"([^"]*)"+/.source,
  // attr value, single quotes
  /'([^']*)'+/.source,
  // attr value, no quotes
  /([^\s"'=<>`]+)/.source
]
var attribute = new RegExp(
  '^\\s*' + singleAttrIdentifier.source +
  '(?:\\s*(' + singleAttrAssign.source + ')' +
  '\\s*(?:' + singleAttrValues.join('|') + '))?'
)

// could use https://www.w3.org/TR/1999/REC-xml-names-19990114/#NT-QName
// but for Vue templates we can enforce a simple charset
var ncname = '[a-zA-Z_][\\w\\-\\.]*'
var qnameCapture = '((?:' + ncname + '\\:)?' + ncname + ')'
var startTagOpen = new RegExp('^<' + qnameCapture)
var startTagClose = /^\s*(\/?)>/
var endTag = new RegExp('^<\\/' + qnameCapture + '[^>]*>')
var doctype = /^<!DOCTYPE [^>]+>/i

var IS_REGEX_CAPTURING_BROKEN = false
'x'.replace(/x(.)?/g, function (m, g) {
  IS_REGEX_CAPTURING_BROKEN = g === ''
})

// Special Elements (can contain anything)
var isSpecialTag = makeMap('script,style', true)

var reCache = {}

var ampRE = /&amp;/g
var ltRE = /&lt;/g
var gtRE = /&gt;/g
var quoteRE = /&quot;/g

function decodeAttr (value, shouldDecodeTags) {
  if (shouldDecodeTags) {
    value = value.replace(ltRE, '<').replace(gtRE, '>')
  }
  return value.replace(ampRE, '&').replace(quoteRE, '"')
}

function parseHTML (html, options) {
  var stack = []
  var expectHTML = options.expectHTML
  var isUnaryTag = options.isUnaryTag || no
  var isFromDOM = options.isFromDOM
  var shouldDecodeTags = options.shouldDecodeTags
  var index = 0
  var last, lastTag
  while (html) {
    last = html
    // Make sure we're not in a script or style element
    if (!lastTag || !isSpecialTag(lastTag)) {
      var textEnd = html.indexOf('<')
      if (textEnd === 0) {
        // Comment:
        if (/^<!--/.test(html)) {
          var commentEnd = html.indexOf('-->')

          if (commentEnd >= 0) {
            advance(commentEnd + 3)
            continue
          }
        }

        // http://en.wikipedia.org/wiki/Conditional_comment#Downlevel-revealed_conditional_comment
        if (/^<!\[/.test(html)) {
          var conditionalEnd = html.indexOf(']>')

          if (conditionalEnd >= 0) {
            advance(conditionalEnd + 2)
            continue
          }
        }

        // Doctype:
        var doctypeMatch = html.match(doctype)
        if (doctypeMatch) {
          advance(doctypeMatch[0].length)
          continue
        }

        // End tag:
        var endTagMatch = html.match(endTag)
        if (endTagMatch) {
          var curIndex = index
          advance(endTagMatch[0].length)
          parseEndTag(endTagMatch[0], endTagMatch[1], curIndex, index)
          continue
        }

        // Start tag:
        var startTagMatch = parseStartTag()
        if (startTagMatch) {
          handleStartTag(startTagMatch)
          continue
        }
      }

      var text
      if (textEnd >= 0) {
        text = html.substring(0, textEnd)
        advance(textEnd)
      } else {
        text = html
        html = ''
      }

      if (options.chars) {
        options.chars(text)
      }
    } else {
      var stackedTag = lastTag.toLowerCase()
      var reStackedTag = reCache[stackedTag] || (reCache[stackedTag] = new RegExp('([\\s\\S]*?)(</' + stackedTag + '[^>]*>)', 'i'))
      var endTagLength = 0
      var rest = html.replace(reStackedTag, function (all, text, endTag) {
        endTagLength = endTag.length
        if (stackedTag !== 'script' && stackedTag !== 'style' && stackedTag !== 'noscript') {
          text = text
            .replace(/<!--([\s\S]*?)-->/g, '$1')
            .replace(/<!\[CDATA\[([\s\S]*?)\]\]>/g, '$1')
        }
        if (options.chars) {
          options.chars(text)
        }
        return ''
      })
      index += html.length - rest.length
      html = rest
      parseEndTag('</' + stackedTag + '>', stackedTag, index - endTagLength, index)
    }

    if (html === last) {
      throw new Error('Error parsing template:\n\n' + html)
    }
  }

  // Clean up any remaining tags
  parseEndTag()

  function advance (n) {
    index += n
    html = html.substring(n)
  }

  function parseStartTag () {
    var start = html.match(startTagOpen)
    if (start) {
      var match = {
        tagName: start[1],
        attrs: [],
        start: index
      }
      advance(start[0].length)
      var end, attr
      while (!(end = html.match(startTagClose)) && (attr = html.match(attribute))) {
        advance(attr[0].length)
        match.attrs.push(attr)
      }
      if (end) {
        match.unarySlash = end[1]
        advance(end[0].length)
        match.end = index
        return match
      }
    }
  }

  function handleStartTag (match) {
    var tagName = match.tagName
    var unarySlash = match.unarySlash

    if (expectHTML) {
      if (lastTag === 'p' && isNonPhrasingTag(tagName)) {
        parseEndTag('', lastTag)
      }
      if (canBeLeftOpenTag(tagName) && lastTag === tagName) {
        parseEndTag('', tagName)
      }
    }

    var unary = isUnaryTag(tagName) || tagName === 'html' && lastTag === 'head' || !!unarySlash

    var l = match.attrs.length
    var attrs = new Array(l)
    for (var i = 0; i < l; i++) {
      var args = match.attrs[i]
      // hackish work around FF bug https://bugzilla.mozilla.org/show_bug.cgi?id=369778
      if (IS_REGEX_CAPTURING_BROKEN && args[0].indexOf('""') === -1) {
        if (args[3] === '') { delete args[3] }
        if (args[4] === '') { delete args[4] }
        if (args[5] === '') { delete args[5] }
      }
      var value = args[3] || args[4] || args[5] || ''
      attrs[i] = {
        name: args[1],
        value: isFromDOM ? decodeAttr(value, shouldDecodeTags) : value
      }
    }

    if (!unary) {
      stack.push({ tag: tagName, attrs: attrs })
      lastTag = tagName
      unarySlash = ''
    }

    if (options.start) {
      options.start(tagName, attrs, unary, match.start, match.end)
    }
  }

  function parseEndTag (tag, tagName, start, end) {
    var pos
    if (start == null) start = index
    if (end == null) end = index

    // Find the closest opened tag of the same type
    if (tagName) {
      var needle = tagName.toLowerCase()
      for (pos = stack.length - 1; pos >= 0; pos--) {
        if (stack[pos].tag.toLowerCase() === needle) {
          break
        }
      }
    } else {
      // If no tag name is provided, clean shop
      pos = 0
    }

    if (pos >= 0) {
      // Close all the open elements, up the stack
      for (var i = stack.length - 1; i >= pos; i--) {
        if (options.end) {
          options.end(stack[i].tag, start, end)
        }
      }

      // Remove the open elements from the stack
      stack.length = pos
      lastTag = pos && stack[pos - 1].tag
    } else if (tagName.toLowerCase() === 'br') {
      if (options.start) {
        options.start(tagName, [], true, start, end)
      }
    } else if (tagName.toLowerCase() === 'p') {
      if (options.start) {
        options.start(tagName, [], false, start, end)
      }
      if (options.end) {
        options.end(tagName, start, end)
      }
    }
  }
}

/*  */

function parseFilters (exp) {
  var inSingle = false
  var inDouble = false
  var curly = 0
  var square = 0
  var paren = 0
  var lastFilterIndex = 0
  var c, prev, i, expression, filters

  for (i = 0; i < exp.length; i++) {
    prev = c
    c = exp.charCodeAt(i)
    if (inSingle) {
      // check single quote
      if (c === 0x27 && prev !== 0x5C) inSingle = !inSingle
    } else if (inDouble) {
      // check double quote
      if (c === 0x22 && prev !== 0x5C) inDouble = !inDouble
    } else if (
      c === 0x7C && // pipe
      exp.charCodeAt(i + 1) !== 0x7C &&
      exp.charCodeAt(i - 1) !== 0x7C &&
      !curly && !square && !paren
    ) {
      if (expression === undefined) {
        // first filter, end of expression
        lastFilterIndex = i + 1
        expression = exp.slice(0, i).trim()
      } else {
        pushFilter()
      }
    } else {
      switch (c) {
        case 0x22: inDouble = true; break // "
        case 0x27: inSingle = true; break // '
        case 0x28: paren++; break         // (
        case 0x29: paren--; break         // )
        case 0x5B: square++; break        // [
        case 0x5D: square--; break        // ]
        case 0x7B: curly++; break         // {
        case 0x7D: curly--; break         // }
      }
    }
  }

  if (expression === undefined) {
    expression = exp.slice(0, i).trim()
  } else if (lastFilterIndex !== 0) {
    pushFilter()
  }

  function pushFilter () {
    (filters || (filters = [])).push(exp.slice(lastFilterIndex, i).trim())
    lastFilterIndex = i + 1
  }

  if (filters) {
    for (i = 0; i < filters.length; i++) {
      expression = wrapFilter(expression, filters[i])
    }
  }

  return expression
}

function wrapFilter (exp, filter) {
  var i = filter.indexOf('(')
  if (i < 0) {
    // _f: resolveFilter
    return ("_f(\"" + filter + "\")(" + exp + ")")
  } else {
    var name = filter.slice(0, i)
    var args = filter.slice(i + 1)
    return ("_f(\"" + name + "\")(" + exp + "," + args)
  }
}

/*  */

var defaultTagRE = /\{\{((?:.|\n)+?)\}\}/g
var regexEscapeRE = /[-.*+?^${}()|[\]\/\\]/g

var buildRegex = cached(function (delimiters) {
  var open = delimiters[0].replace(regexEscapeRE, '\\$&')
  var close = delimiters[1].replace(regexEscapeRE, '\\$&')
  return new RegExp(open + '((?:.|\\n)+?)' + close, 'g')
})

function parseText (
  text,
  delimiters
) {
  var tagRE = delimiters ? buildRegex(delimiters) : defaultTagRE
  if (!tagRE.test(text)) {
    return
  }
  var tokens = []
  var lastIndex = tagRE.lastIndex = 0
  var match, index
  while ((match = tagRE.exec(text))) {
    index = match.index
    // push text token
    if (index > lastIndex) {
      tokens.push(JSON.stringify(text.slice(lastIndex, index)))
    }
    // tag token
    var exp = parseFilters(match[1].trim())
    tokens.push(("_s(" + exp + ")"))
    lastIndex = index + match[0].length
  }
  if (lastIndex < text.length) {
    tokens.push(JSON.stringify(text.slice(lastIndex)))
  }
  return tokens.join('+')
}

/*  */

function baseWarn (msg) {
  console.error(("[Vue parser]: " + msg))
}

function pluckModuleFunction (
  modules,
  key
) {
  return modules
    ? modules.map(function (m) { return m[key]; }).filter(function (_) { return _; })
    : []
}

function addProp (el, name, value) {
  (el.props || (el.props = [])).push({ name: name, value: value })
}

function addAttr (el, name, value) {
  (el.attrs || (el.attrs = [])).push({ name: name, value: value })
}

function addDirective (
  el,
  name,
  value,
  arg,
  modifiers
) {
  (el.directives || (el.directives = [])).push({ name: name, value: value, arg: arg, modifiers: modifiers })
}

function addHook (el, name, code) {
  var hooks = el.hooks || (el.hooks = {})
  var hook = hooks[name]
  /* istanbul ignore if */
  if (hook) {
    hook.push(code)
  } else {
    hooks[name] = [code]
  }
}

function addHandler (
  el,
  name,
  value,
  modifiers,
  important
) {
  // check capture modifier
  if (modifiers && modifiers.capture) {
    delete modifiers.capture
    name = '!' + name // mark the event as captured
  }
  var events
  if (modifiers && modifiers.native) {
    delete modifiers.native
    events = el.nativeEvents || (el.nativeEvents = {})
  } else {
    events = el.events || (el.events = {})
  }
  var newHandler = { value: value, modifiers: modifiers }
  var handlers = events[name]
  /* istanbul ignore if */
  if (Array.isArray(handlers)) {
    important ? handlers.unshift(newHandler) : handlers.push(newHandler)
  } else if (handlers) {
    events[name] = important ? [newHandler, handlers] : [handlers, newHandler]
  } else {
    events[name] = newHandler
  }
}

function getBindingAttr (
  el,
  name,
  getStatic
) {
  var dynamicValue =
    getAndRemoveAttr(el, ':' + name) ||
    getAndRemoveAttr(el, 'v-bind:' + name)
  if (dynamicValue != null) {
    return dynamicValue
  } else if (getStatic !== false) {
    var staticValue = getAndRemoveAttr(el, name)
    if (staticValue != null) {
      return JSON.stringify(staticValue)
    }
  }
}

function getAndRemoveAttr (el, name) {
  var val
  if ((val = el.attrsMap[name]) != null) {
    var list = el.attrsList
    for (var i = 0, l = list.length; i < l; i++) {
      if (list[i].name === name) {
        list.splice(i, 1)
        break
      }
    }
  }
  return val
}

/*  */

var dirRE = /^v-|^@|^:/
var forAliasRE = /(.*)\s+(?:in|of)\s+(.*)/
var forIteratorRE = /\(([^,]*),([^,]*)(?:,([^,]*))?\)/
var bindRE = /^:|^v-bind:/
var onRE = /^@|^v-on:/
var argRE = /:(.*)$/
var modifierRE = /\.[^\.]+/g

var decodeHTMLCached = cached(entities.decodeHTML)

// configurable state
var warn$1
var platformGetTagNamespace
var platformMustUseProp
var platformIsPreTag
var preTransforms
var transforms
var postTransforms
var delimiters

/**
 * Convert HTML string to AST.
 */
function parse (
  template,
  options
) {
  warn$1 = options.warn || baseWarn
  platformGetTagNamespace = options.getTagNamespace || no
  platformMustUseProp = options.mustUseProp || no
  platformIsPreTag = options.isPreTag || no
  preTransforms = pluckModuleFunction(options.modules, 'preTransformNode')
  transforms = pluckModuleFunction(options.modules, 'transformNode')
  postTransforms = pluckModuleFunction(options.modules, 'postTransformNode')
  delimiters = options.delimiters
  var stack = []
  var preserveWhitespace = options.preserveWhitespace !== false
  var root
  var currentParent
  var inVPre = false
  var inPre = false
  var warned = false
  parseHTML(template, {
    expectHTML: options.expectHTML,
    isUnaryTag: options.isUnaryTag,
    isFromDOM: options.isFromDOM,
    shouldDecodeTags: options.shouldDecodeTags,
    start: function start (tag, attrs, unary) {
      // check namespace.
      // inherit parent ns if there is one
      var ns = (currentParent && currentParent.ns) || platformGetTagNamespace(tag)

      // handle IE svg bug
      /* istanbul ignore if */
      if (options.isIE && ns === 'svg') {
        attrs = guardIESVGBug(attrs)
      }

      var element = {
        type: 1,
        tag: tag,
        attrsList: attrs,
        attrsMap: makeAttrsMap(attrs),
        parent: currentParent,
        children: []
      }
      if (ns) {
        element.ns = ns
      }

      if (process.env.VUE_ENV !== 'server' && isForbiddenTag(element)) {
        element.forbidden = true
        process.env.NODE_ENV !== 'production' && warn$1(
          'Templates should only be responsible for mapping the state to the ' +
          'UI. Avoid placing tags with side-effects in your templates, such as ' +
          "<" + tag + ">."
        )
      }

      // apply pre-transforms
      for (var i = 0; i < preTransforms.length; i++) {
        preTransforms[i](element, options)
      }

      if (!inVPre) {
        processPre(element)
        if (element.pre) {
          inVPre = true
        }
      }
      if (platformIsPreTag(element.tag)) {
        inPre = true
      }
      if (inVPre) {
        processRawAttrs(element)
      } else {
        processFor(element)
        processIf(element)
        processOnce(element)

        // determine whether this is a plain element after
        // removing structural attributes
        element.plain = !element.key && !attrs.length

        processKey(element)
        processRef(element)
        processSlot(element)
        processComponent(element)
        for (var i$1 = 0; i$1 < transforms.length; i$1++) {
          transforms[i$1](element, options)
        }
        processAttrs(element)
      }

      function checkRootConstraints (el) {
        if (process.env.NODE_ENV !== 'production') {
          if (el.tag === 'slot' || el.tag === 'template') {
            warn$1(
              "Cannot use <" + (el.tag) + "> as component root element because it may " +
              'contain multiple nodes:\n' + template
            )
          }
          if (el.attrsMap.hasOwnProperty('v-for')) {
            warn$1(
              'Cannot use v-for on stateful component root element because ' +
              'it renders multiple elements:\n' + template
            )
          }
        }
      }

      // tree management
      if (!root) {
        root = element
        checkRootConstraints(root)
      } else if (process.env.NODE_ENV !== 'production' && !stack.length && !warned) {
        // allow 2 root elements with v-if and v-else
        if ((root.attrsMap.hasOwnProperty('v-if') && element.attrsMap.hasOwnProperty('v-else'))) {
          checkRootConstraints(element)
        } else {
          warned = true
          warn$1(
            ("Component template should contain exactly one root element:\n\n" + template)
          )
        }
      }
      if (currentParent && !element.forbidden) {
        if (element.else) {
          processElse(element, currentParent)
        } else {
          currentParent.children.push(element)
          element.parent = currentParent
        }
      }
      if (!unary) {
        currentParent = element
        stack.push(element)
      }
      // apply post-transforms
      for (var i$2 = 0; i$2 < postTransforms.length; i$2++) {
        postTransforms[i$2](element, options)
      }
    },

    end: function end () {
      // remove trailing whitespace
      var element = stack[stack.length - 1]
      var lastNode = element.children[element.children.length - 1]
      if (lastNode && lastNode.type === 3 && lastNode.text === ' ') {
        element.children.pop()
      }
      // pop stack
      stack.length -= 1
      currentParent = stack[stack.length - 1]
      // check pre state
      if (element.pre) {
        inVPre = false
      }
      if (platformIsPreTag(element.tag)) {
        inPre = false
      }
    },

    chars: function chars (text) {
      if (!currentParent) {
        if (process.env.NODE_ENV !== 'production' && !warned) {
          warned = true
          warn$1(
            'Component template should contain exactly one root element:\n\n' + template
          )
        }
        return
      }
      text = inPre || text.trim()
        ? decodeHTMLCached(text)
        // only preserve whitespace if its not right after a starting tag
        : preserveWhitespace && currentParent.children.length ? ' ' : ''
      if (text) {
        var expression
        if (!inVPre && text !== ' ' && (expression = parseText(text, delimiters))) {
          currentParent.children.push({
            type: 2,
            expression: expression,
            text: text
          })
        } else {
          currentParent.children.push({
            type: 3,
            text: text
          })
        }
      }
    }
  })
  return root
}

function processPre (el) {
  if (getAndRemoveAttr(el, 'v-pre') != null) {
    el.pre = true
  }
}

function processRawAttrs (el) {
  var l = el.attrsList.length
  if (l) {
    var attrs = el.attrs = new Array(l)
    for (var i = 0; i < l; i++) {
      attrs[i] = {
        name: el.attrsList[i].name,
        value: JSON.stringify(el.attrsList[i].value)
      }
    }
  } else if (!el.pre) {
    // non root node in pre blocks with no attributes
    el.plain = true
  }
}

function processKey (el) {
  var exp = getBindingAttr(el, 'key')
  if (exp) {
    el.key = exp
  }
}

function processRef (el) {
  var ref = getBindingAttr(el, 'ref')
  if (ref) {
    el.ref = ref
    el.refInFor = checkInFor(el)
  }
}

function processFor (el) {
  var exp
  if ((exp = getAndRemoveAttr(el, 'v-for'))) {
    var inMatch = exp.match(forAliasRE)
    if (!inMatch) {
      process.env.NODE_ENV !== 'production' && warn$1(
        ("Invalid v-for expression: " + exp)
      )
      return
    }
    el.for = inMatch[2].trim()
    var alias = inMatch[1].trim()
    var iteratorMatch = alias.match(forIteratorRE)
    if (iteratorMatch) {
      el.alias = iteratorMatch[1].trim()
      el.iterator1 = iteratorMatch[2].trim()
      if (iteratorMatch[3]) {
        el.iterator2 = iteratorMatch[3].trim()
      }
    } else {
      el.alias = alias
    }
  }
}

function processIf (el) {
  var exp = getAndRemoveAttr(el, 'v-if')
  if (exp) {
    el.if = exp
  }
  if (getAndRemoveAttr(el, 'v-else') != null) {
    el.else = true
  }
}

function processElse (el, parent) {
  var prev = findPrevElement(parent.children)
  if (prev && prev.if) {
    prev.elseBlock = el
  } else if (process.env.NODE_ENV !== 'production') {
    warn$1(
      ("v-else used on element <" + (el.tag) + "> without corresponding v-if.")
    )
  }
}

function processOnce (el) {
  var once = getAndRemoveAttr(el, 'v-once')
  if (once != null) {
    el.once = true
  }
}

function processSlot (el) {
  if (el.tag === 'slot') {
    el.slotName = getBindingAttr(el, 'name')
  } else {
    var slotTarget = getBindingAttr(el, 'slot')
    if (slotTarget) {
      el.slotTarget = slotTarget
    }
  }
}

function processComponent (el) {
  var binding
  if ((binding = getBindingAttr(el, 'is'))) {
    el.component = binding
  }
  if (getAndRemoveAttr(el, 'inline-template') != null) {
    el.inlineTemplate = true
  }
}

function processAttrs (el) {
  var list = el.attrsList
  var i, l, name, value, arg, modifiers, isProp
  for (i = 0, l = list.length; i < l; i++) {
    name = list[i].name
    value = list[i].value
    if (dirRE.test(name)) {
      // mark element as dynamic
      el.hasBindings = true
      // modifiers
      modifiers = parseModifiers(name)
      if (modifiers) {
        name = name.replace(modifierRE, '')
      }
      if (bindRE.test(name)) { // v-bind
        name = name.replace(bindRE, '')
        if (modifiers && modifiers.prop) {
          isProp = true
          name = camelize(name)
          if (name === 'innerHtml') name = 'innerHTML'
        }
        if (isProp || platformMustUseProp(name)) {
          addProp(el, name, value)
        } else {
          addAttr(el, name, value)
        }
      } else if (onRE.test(name)) { // v-on
        name = name.replace(onRE, '')
        addHandler(el, name, value, modifiers)
      } else { // normal directives
        name = name.replace(dirRE, '')
        // parse arg
        var argMatch = name.match(argRE)
        if (argMatch && (arg = argMatch[1])) {
          name = name.slice(0, -(arg.length + 1))
        }
        addDirective(el, name, value, arg, modifiers)
      }
    } else {
      // literal attribute
      if (process.env.NODE_ENV !== 'production') {
        var expression = parseText(value, delimiters)
        if (expression) {
          warn$1(
            name + "=\"" + value + "\": " +
            'Interpolation inside attributes has been deprecated. ' +
            'Use v-bind or the colon shorthand instead.'
          )
        }
      }
      addAttr(el, name, JSON.stringify(value))
    }
  }
}

function checkInFor (el) {
  var parent = el
  while (parent) {
    if (parent.for !== undefined) {
      return true
    }
    parent = parent.parent
  }
  return false
}

function parseModifiers (name) {
  var match = name.match(modifierRE)
  if (match) {
    var ret = {}
    match.forEach(function (m) { ret[m.slice(1)] = true })
    return ret
  }
}

function makeAttrsMap (attrs) {
  var map = {}
  for (var i = 0, l = attrs.length; i < l; i++) {
    if (process.env.NODE_ENV !== 'production' && map[attrs[i].name]) {
      warn$1('duplicate attribute: ' + attrs[i].name)
    }
    map[attrs[i].name] = attrs[i].value
  }
  return map
}

function findPrevElement (children) {
  var i = children.length
  while (i--) {
    if (children[i].tag) return children[i]
  }
}

function isForbiddenTag (el) {
  return (
    el.tag === 'style' ||
    (el.tag === 'script' && (
      !el.attrsMap.type ||
      el.attrsMap.type === 'text/javascript'
    ))
  )
}

var ieNSBug = /^xmlns:NS\d+/
var ieNSPrefix = /^NS\d+:/

/* istanbul ignore next */
function guardIESVGBug (attrs) {
  var res = []
  for (var i = 0; i < attrs.length; i++) {
    var attr = attrs[i]
    if (!ieNSBug.test(attr.name)) {
      attr.name = attr.name.replace(ieNSPrefix, '')
      res.push(attr)
    }
  }
  return res
}

/*  */

var isStaticKey
var isPlatformReservedTag

var genStaticKeysCached = cached(genStaticKeys$1)

/**
 * Goal of the optimizier: walk the generated template AST tree
 * and detect sub-trees that are purely static, i.e. parts of
 * the DOM that never needs to change.
 *
 * Once we detect these sub-trees, we can:
 *
 * 1. Hoist them into constants, so that we no longer need to
 *    create fresh nodes for them on each re-render;
 * 2. Completely skip them in the patching process.
 */
function optimize (root, options) {
  if (!root) return
  isStaticKey = genStaticKeysCached(options.staticKeys || '')
  isPlatformReservedTag = options.isReservedTag || (function () { return false; })
  // first pass: mark all non-static nodes.
  markStatic(root)
  // second pass: mark static roots.
  markStaticRoots(root, false)
}

function genStaticKeys$1 (keys) {
  return makeMap(
    'type,tag,attrsList,attrsMap,plain,parent,children,attrs' +
    (keys ? ',' + keys : '')
  )
}

function markStatic (node) {
  node.static = isStatic(node)
  if (node.type === 1) {
    for (var i = 0, l = node.children.length; i < l; i++) {
      var child = node.children[i]
      markStatic(child)
      if (!child.static) {
        node.static = false
      }
    }
  }
}

function markStaticRoots (node, isInFor) {
  if (node.type === 1) {
    if (node.once || node.static) {
      node.staticRoot = true
      node.staticInFor = isInFor
      return
    }
    if (node.children) {
      for (var i = 0, l = node.children.length; i < l; i++) {
        markStaticRoots(node.children[i], !!node.for)
      }
    }
  }
}

function isStatic (node) {
  if (node.type === 2) { // expression
    return false
  }
  if (node.type === 3) { // text
    return true
  }
  return !!(node.pre || (
    !node.hasBindings && // no dynamic bindings
    !node.if && !node.for && // not v-if or v-for or v-else
    !isBuiltInTag(node.tag) && // not a built-in
    isPlatformReservedTag(node.tag) && // not a component
    Object.keys(node).every(isStaticKey)
  ))
}

/*  */

var simplePathRE = /^[A-Za-z_$][\w$]*(?:\.[A-Za-z_$][\w$]*|\['.*?'\]|\[".*?"\]|\[\d+\]|\[[A-Za-z_$][\w$]*\])*$/

// keyCode aliases
var keyCodes = {
  esc: 27,
  tab: 9,
  enter: 13,
  space: 32,
  up: 38,
  left: 37,
  right: 39,
  down: 40,
  'delete': [8, 46]
}

var modifierCode = {
  stop: '$event.stopPropagation();',
  prevent: '$event.preventDefault();',
  self: 'if($event.target !== $event.currentTarget)return;'
}

function genHandlers (events, native) {
  var res = native ? 'nativeOn:{' : 'on:{'
  for (var name in events) {
    res += "\"" + name + "\":" + (genHandler(events[name])) + ","
  }
  return res.slice(0, -1) + '}'
}

function genHandler (
  handler
) {
  if (!handler) {
    return 'function(){}'
  } else if (Array.isArray(handler)) {
    return ("[" + (handler.map(genHandler).join(',')) + "]")
  } else if (!handler.modifiers) {
    return simplePathRE.test(handler.value)
      ? handler.value
      : ("function($event){" + (handler.value) + "}")
  } else {
    var code = ''
    var keys = []
    for (var key in handler.modifiers) {
      if (modifierCode[key]) {
        code += modifierCode[key]
      } else {
        keys.push(key)
      }
    }
    if (keys.length) {
      code = genKeyFilter(keys) + code
    }
    var handlerCode = simplePathRE.test(handler.value)
      ? handler.value + '($event)'
      : handler.value
    return 'function($event){' + code + handlerCode + '}'
  }
}

function genKeyFilter (keys) {
  var code = keys.length === 1
    ? normalizeKeyCode(keys[0])
    : Array.prototype.concat.apply([], keys.map(normalizeKeyCode))
  if (Array.isArray(code)) {
    return ("if(" + (code.map(function (c) { return ("$event.keyCode!==" + c); }).join('&&')) + ")return;")
  } else {
    return ("if($event.keyCode!==" + code + ")return;")
  }
}

function normalizeKeyCode (key) {
  return (
    parseInt(key, 10) || // number keyCode
    keyCodes[key] || // built-in alias
    ("_k(" + (JSON.stringify(key)) + ")") // custom alias
  )
}

/*  */

function bind$1 (el, dir) {
  addHook(el, 'construct', ("_b(n1," + (dir.value) + (dir.modifiers && dir.modifiers.prop ? ',true' : '') + ")"))
}

var baseDirectives = {
  bind: bind$1,
  cloak: noop
}

/*  */

// configurable state
var warn$2
var transforms$1
var dataGenFns
var platformDirectives
var staticRenderFns
var currentOptions

function generate (
  ast,
  options
) {
  // save previous staticRenderFns so generate calls can be nested
  var prevStaticRenderFns = staticRenderFns
  var currentStaticRenderFns = staticRenderFns = []
  currentOptions = options
  warn$2 = options.warn || baseWarn
  transforms$1 = pluckModuleFunction(options.modules, 'transformCode')
  dataGenFns = pluckModuleFunction(options.modules, 'genData')
  platformDirectives = options.directives || {}
  var code = ast ? genElement(ast) : '_h("div")'
  staticRenderFns = prevStaticRenderFns
  return {
    render: ("with(this){return " + code + "}"),
    staticRenderFns: currentStaticRenderFns
  }
}

function genElement (el) {
  if (el.staticRoot && !el.staticProcessed) {
    // hoist static sub-trees out
    el.staticProcessed = true
    staticRenderFns.push(("with(this){return " + (genElement(el)) + "}"))
    return ("_m(" + (staticRenderFns.length - 1) + (el.staticInFor ? ',true' : '') + ")")
  } else if (el.for && !el.forProcessed) {
    return genFor(el)
  } else if (el.if && !el.ifProcessed) {
    return genIf(el)
  } else if (el.tag === 'template' && !el.slotTarget) {
    return genChildren(el) || 'void 0'
  } else if (el.tag === 'slot') {
    return genSlot(el)
  } else {
    // component or element
    var code
    if (el.component) {
      code = genComponent(el)
    } else {
      var data = genData(el)
      var children = el.inlineTemplate ? null : genChildren(el)
      code = "_h('" + (el.tag) + "'" + (data ? ("," + data) : '') + (children ? ("," + children) : '') + ")"
    }
    // module transforms
    for (var i = 0; i < transforms$1.length; i++) {
      code = transforms$1[i](el, code)
    }
    return code
  }
}

function genIf (el) {
  var exp = el.if
  el.ifProcessed = true // avoid recursion
  return ("(" + exp + ")?" + (genElement(el)) + ":" + (genElse(el)))
}

function genElse (el) {
  return el.elseBlock
    ? genElement(el.elseBlock)
    : '_e()'
}

function genFor (el) {
  var exp = el.for
  var alias = el.alias
  var iterator1 = el.iterator1 ? ("," + (el.iterator1)) : ''
  var iterator2 = el.iterator2 ? ("," + (el.iterator2)) : ''
  el.forProcessed = true // avoid recursion
  return "(" + exp + ")&&_l((" + exp + ")," +
    "function(" + alias + iterator1 + iterator2 + "){" +
      "return " + (genElement(el)) +
    '})'
}

function genData (el) {
  if (el.plain) {
    return
  }

  var data = '{'

  // directives first.
  // directives may mutate the el's other properties before they are generated.
  var dirs = genDirectives(el)
  if (dirs) data += dirs + ','

  // key
  if (el.key) {
    data += "key:" + (el.key) + ","
  }
  // ref
  if (el.ref) {
    data += "ref:" + (el.ref) + ","
  }
  if (el.refInFor) {
    data += "refInFor:true,"
  }
  // record original tag name for components using "is" attribute
  if (el.component) {
    data += "tag:\"" + (el.tag) + "\","
  }
  // slot target
  if (el.slotTarget) {
    data += "slot:" + (el.slotTarget) + ","
  }
  // module data generation functions
  for (var i = 0; i < dataGenFns.length; i++) {
    data += dataGenFns[i](el)
  }
  // attributes
  if (el.attrs) {
    data += "attrs:{" + (genProps(el.attrs)) + "},"
  }
  // DOM props
  if (el.props) {
    data += "domProps:{" + (genProps(el.props)) + "},"
  }
  // hooks
  if (el.hooks) {
    data += "hook:{" + (genHooks(el.hooks)) + "},"
  }
  // event handlers
  if (el.events) {
    data += (genHandlers(el.events)) + ","
  }
  if (el.nativeEvents) {
    data += (genHandlers(el.nativeEvents, true)) + ","
  }
  // inline-template
  if (el.inlineTemplate) {
    var ast = el.children[0]
    if (process.env.NODE_ENV !== 'production' && (
      el.children.length > 1 || ast.type !== 1
    )) {
      warn$2('Inline-template components must have exactly one child element.')
    }
    if (ast.type === 1) {
      var inlineRenderFns = generate(ast, currentOptions)
      data += "inlineTemplate:{render:function(){" + (inlineRenderFns.render) + "},staticRenderFns:[" + (inlineRenderFns.staticRenderFns.map(function (code) { return ("function(){" + code + "}"); }).join(',')) + "]}"
    }
  }
  return data.replace(/,$/, '') + '}'
}

function genDirectives (el) {
  var dirs = el.directives
  if (!dirs) return
  var res = 'directives:['
  var hasRuntime = false
  var i, l, dir, needRuntime
  for (i = 0, l = dirs.length; i < l; i++) {
    dir = dirs[i]
    needRuntime = true
    var gen = platformDirectives[dir.name] || baseDirectives[dir.name]
    if (gen) {
      // compile-time directive that manipulates AST.
      // returns true if it also needs a runtime counterpart.
      needRuntime = !!gen(el, dir, warn$2)
    }
    if (needRuntime) {
      hasRuntime = true
      res += "{name:\"" + (dir.name) + "\"" + (dir.value ? (",value:(" + (dir.value) + "),expression:" + (JSON.stringify(dir.value))) : '') + (dir.arg ? (",arg:\"" + (dir.arg) + "\"") : '') + (dir.modifiers ? (",modifiers:" + (JSON.stringify(dir.modifiers))) : '') + "},"
    }
  }
  if (hasRuntime) {
    return res.slice(0, -1) + ']'
  }
}

function genChildren (el) {
  if (el.children.length) {
    return '[' + el.children.map(genNode).join(',') + ']'
  }
}

function genNode (node) {
  if (node.type === 1) {
    return genElement(node)
  } else {
    return genText(node)
  }
}

function genText (text) {
  return text.type === 2
    ? text.expression // no need for () because already wrapped in _s()
    : JSON.stringify(text.text)
}

function genSlot (el) {
  var slotName = el.slotName || '"default"'
  var children = genChildren(el)
  return children
    ? ("_t(" + slotName + "," + children + ")")
    : ("_t(" + slotName + ")")
}

function genComponent (el) {
  var children = genChildren(el)
  return ("_h(" + (el.component) + "," + (genData(el)) + (children ? ("," + children) : '') + ")")
}

function genProps (props) {
  var res = ''
  for (var i = 0; i < props.length; i++) {
    var prop = props[i]
    res += "\"" + (prop.name) + "\":" + (prop.value) + ","
  }
  return res.slice(0, -1)
}

function genHooks (hooks) {
  var res = ''
  for (var key in hooks) {
    res += "\"" + key + "\":function(n1,n2){" + (hooks[key].join(';')) + "},"
  }
  return res.slice(0, -1)
}

/*  */

/**
 * Compile a template.
 */
function compile$2 (
  template,
  options
) {
  var ast = parse(template.trim(), options)
  optimize(ast, options)
  var code = generate(ast, options)
  return {
    ast: ast,
    render: code.render,
    staticRenderFns: code.staticRenderFns
  }
}

/*  */

// operators like typeof, instanceof and in are allowed
var prohibitedKeywordRE = new RegExp('\\b' + (
  'do,if,for,let,new,try,var,case,else,with,await,break,catch,class,const,' +
  'super,throw,while,yield,delete,export,import,return,switch,default,' +
  'extends,finally,continue,debugger,function,arguments'
).split(',').join('\\b|\\b') + '\\b')
// check valid identifier for v-for
var identRE = /[A-Za-z_$][\w$]*/
// strip strings in expressions
var stripStringRE = /'(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*"|`(?:[^`\\]|\\.)*\$\{|\}(?:[^`\\]|\\.)*`|`(?:[^`\\]|\\.)*`/g

// detect problematic expressions in a template
function detectErrors (ast) {
  var errors = []
  if (ast) {
    checkNode(ast, errors)
  }
  return errors
}

function checkNode (node, errors) {
  if (node.type === 1) {
    for (var name in node.attrsMap) {
      if (dirRE.test(name)) {
        var value = node.attrsMap[name]
        if (value) {
          if (name === 'v-for') {
            checkFor(node, ("v-for=\"" + value + "\""), errors)
          } else {
            checkExpression(value, (name + "=\"" + value + "\""), errors)
          }
        }
      }
    }
    if (node.children) {
      for (var i = 0; i < node.children.length; i++) {
        checkNode(node.children[i], errors)
      }
    }
  } else if (node.type === 2) {
    checkExpression(node.expression, node.text, errors)
  }
}

function checkFor (node, text, errors) {
  checkExpression(node.for || '', text, errors)
  checkIdentifier(node.alias, 'v-for alias', text, errors)
  checkIdentifier(node.iterator1, 'v-for iterator', text, errors)
  checkIdentifier(node.iterator2, 'v-for iterator', text, errors)
}

function checkIdentifier (ident, type, text, errors) {
  if (typeof ident === 'string' && !identRE.test(ident)) {
    errors.push(("- invalid " + type + " \"" + ident + "\" in expression: " + text))
  }
}

function checkExpression (exp, text, errors) {
  try {
    new Function(("return " + exp))
  } catch (e) {
    var keywordMatch = exp.replace(stripStringRE, '').match(prohibitedKeywordRE)
    if (keywordMatch) {
      errors.push(
        "- avoid using JavaScript keyword as property name: " +
        "\"" + (keywordMatch[0]) + "\" in expression " + text
      )
    } else {
      errors.push(("- invalid expression: " + text))
    }
  }
}

/*  */

function transformNode (el, options) {
  var warn = options.warn || baseWarn
  var staticClass = getAndRemoveAttr(el, 'class')
  if (process.env.NODE_ENV !== 'production' && staticClass) {
    var expression = parseText(staticClass, options.delimiters)
    if (expression) {
      warn(
        "class=\"" + staticClass + "\": " +
        'Interpolation inside attributes has been deprecated. ' +
        'Use v-bind or the colon shorthand instead.'
      )
    }
  }
  if (staticClass) {
    el.staticClass = JSON.stringify(staticClass)
  }
  var classBinding = getBindingAttr(el, 'class', false /* getStatic */)
  if (classBinding) {
    el.classBinding = classBinding
  }
}

function genData$1 (el) {
  var data = ''
  if (el.staticClass) {
    data += "staticClass:" + (el.staticClass) + ","
  }
  if (el.classBinding) {
    data += "class:" + (el.classBinding) + ","
  }
  return data
}

var klass = {
  staticKeys: ['staticClass'],
  transformNode: transformNode,
  genData: genData$1
}

/*  */

function transformNode$1 (el) {
  var styleBinding = getBindingAttr(el, 'style', false /* getStatic */)
  if (styleBinding) {
    el.styleBinding = styleBinding
  }
}

function genData$2 (el) {
  return el.styleBinding
    ? ("style:(" + (el.styleBinding) + "),")
    : ''
}

var style = {
  transformNode: transformNode$1,
  genData: genData$2
}

var modules = [
  klass,
  style
]

/*  */

var warn$3

function model (
  el,
  dir,
  _warn
) {
  warn$3 = _warn
  var value = dir.value
  var modifiers = dir.modifiers
  var tag = el.tag
  var type = el.attrsMap.type
  if (tag === 'select') {
    return genSelect(el, value)
  } else if (tag === 'input' && type === 'checkbox') {
    genCheckboxModel(el, value)
  } else if (tag === 'input' && type === 'radio') {
    genRadioModel(el, value)
  } else {
    return genDefaultModel(el, value, modifiers)
  }
}

function genCheckboxModel (el, value) {
  if (process.env.NODE_ENV !== 'production' &&
    el.attrsMap.checked != null) {
    warn$3(
      "<" + (el.tag) + " v-model=\"" + value + "\" checked>:\n" +
      "inline checked attributes will be ignored when using v-model. " +
      'Declare initial values in the component\'s data option instead.'
    )
  }
  var valueBinding = getBindingAttr(el, 'value') || 'null'
  var trueValueBinding = getBindingAttr(el, 'true-value') || 'true'
  var falseValueBinding = getBindingAttr(el, 'false-value') || 'false'
  addProp(el, 'checked',
    "Array.isArray(" + value + ")" +
      "?(" + value + ").indexOf(" + valueBinding + ")>-1" +
      ":(" + value + ")===(" + trueValueBinding + ")"
  )
  addHandler(el, 'change',
    "var $$a=" + value + "," +
        '$$el=$event.target,' +
        "$$c=$$el.checked?(" + trueValueBinding + "):(" + falseValueBinding + ");" +
    'if(Array.isArray($$a)){' +
      "var $$v=" + valueBinding + "," +
          '$$i=$$a.indexOf($$v);' +
      "if($$c){$$i<0&&(" + value + "=$$a.concat($$v))}" +
      "else{$$i>-1&&(" + value + "=$$a.slice(0,$$i).concat($$a.slice($$i+1)))}" +
    "}else{" + value + "=$$c}",
    null, true
  )
}

function genRadioModel (el, value) {
  if (process.env.NODE_ENV !== 'production' &&
    el.attrsMap.checked != null) {
    warn$3(
      "<" + (el.tag) + " v-model=\"" + value + "\" checked>:\n" +
      "inline checked attributes will be ignored when using v-model. " +
      'Declare initial values in the component\'s data option instead.'
    )
  }
  var valueBinding = getBindingAttr(el, 'value') || 'null'
  addProp(el, 'checked', ("(" + value + ")===(" + valueBinding + ")"))
  addHandler(el, 'change', (value + "=" + valueBinding), null, true)
}

function genDefaultModel (
  el,
  value,
  modifiers
) {
  if (process.env.NODE_ENV !== 'production') {
    if (el.tag === 'input' && el.attrsMap.value) {
      warn$3(
        "<" + (el.tag) + " v-model=\"" + value + "\" value=\"" + (el.attrsMap.value) + "\">:\n" +
        'inline value attributes will be ignored when using v-model. ' +
        'Declare initial values in the component\'s data option instead.'
      )
    }
    if (el.tag === 'textarea' && el.children.length) {
      warn$3(
        "<textarea v-model=\"" + value + "\">:\n" +
        'inline content inside <textarea> will be ignored when using v-model. ' +
        'Declare initial values in the component\'s data option instead.'
      )
    }
  }

  var type = el.attrsMap.type
  var ref = modifiers || {};
  var lazy = ref.lazy;
  var number = ref.number;
  var trim = ref.trim;
  var event = lazy || (isIE && type === 'range') ? 'change' : 'input'
  var needCompositionGuard = !lazy && type !== 'range'
  var isNative = el.tag === 'input' || el.tag === 'textarea'

  var valueExpression = isNative
    ? ("$event.target.value" + (trim ? '.trim()' : ''))
    : "$event"
  var code = number || type === 'number'
    ? (value + "=_n(" + valueExpression + ")")
    : (value + "=" + valueExpression)
  if (isNative && needCompositionGuard) {
    code = "if($event.target.composing)return;" + code
  }
  addProp(el, 'value', isNative ? ("_s(" + value + ")") : ("(" + value + ")"))
  addHandler(el, event, code, null, true)
  if (needCompositionGuard) {
    // need runtime directive code to help with composition events
    return true
  }
}

function genSelect (el, value) {
  if (process.env.NODE_ENV !== 'production') {
    el.children.some(checkOptionWarning)
  }
  var code = value + "=Array.prototype.filter" +
    ".call($event.target.options,function(o){return o.selected})" +
    ".map(function(o){return \"_value\" in o ? o._value : o.value})" +
    (el.attrsMap.multiple == null ? '[0]' : '')
  addHandler(el, 'change', code, null, true)
  // need runtime to help with possible dynamically generated options
  return true
}

function checkOptionWarning (option) {
  if (option.type === 1 &&
    option.tag === 'option' &&
    option.attrsMap.selected != null) {
    warn$3(
      "<select v-model=\"" + (option.parent.attrsMap['v-model']) + "\">:\n" +
      'inline selected attributes on <option> will be ignored when using v-model. ' +
      'Declare initial values in the component\'s data option instead.'
    )
    return true
  }
  return false
}

/*  */

function text (el, dir) {
  if (dir.value) {
    addProp(el, 'textContent', ("_s(" + (dir.value) + ")"))
  }
}

/*  */

function html (el, dir) {
  if (dir.value) {
    addProp(el, 'innerHTML', ("_s(" + (dir.value) + ")"))
  }
}

var directives = {
  model: model,
  text: text,
  html: html
}

/*  */

var cache = Object.create(null)

var baseOptions = {
  isIE: isIE,
  expectHTML: true,
  modules: modules,
  staticKeys: genStaticKeys(modules),
  directives: directives,
  isReservedTag: isReservedTag,
  isUnaryTag: isUnaryTag,
  mustUseProp: mustUseProp,
  getTagNamespace: getTagNamespace,
  isPreTag: isPreTag
}

function compile$1 (
  template,
  options
) {
  options = options
    ? extend(extend({}, baseOptions), options)
    : baseOptions
  return compile$2(template, options)
}

function compileToFunctions (
  template,
  options,
  vm
) {
  var _warn = (options && options.warn) || warn
  // detect possible CSP restriction
  /* istanbul ignore if */
  if (process.env.NODE_ENV !== 'production') {
    try {
      new Function('return 1')
    } catch (e) {
      if (e.toString().match(/unsafe-eval|CSP/)) {
        _warn(
          'It seems you are using the standalone build of Vue.js in an ' +
          'environment with Content Security Policy that prohibits unsafe-eval. ' +
          'The template compiler cannot work in this environment. Consider ' +
          'relaxing the policy to allow unsafe-eval or pre-compiling your ' +
          'templates into render functions.'
        )
      }
    }
  }
  var key = options && options.delimiters
    ? String(options.delimiters) + template
    : template
  if (cache[key]) {
    return cache[key]
  }
  var res = {}
  var compiled = compile$1(template, options)
  res.render = makeFunction(compiled.render)
  var l = compiled.staticRenderFns.length
  res.staticRenderFns = new Array(l)
  for (var i = 0; i < l; i++) {
    res.staticRenderFns[i] = makeFunction(compiled.staticRenderFns[i])
  }
  if (process.env.NODE_ENV !== 'production') {
    if (res.render === noop || res.staticRenderFns.some(function (fn) { return fn === noop; })) {
      _warn(
        "failed to compile template:\n\n" + template + "\n\n" +
        detectErrors(compiled.ast).join('\n') +
        '\n\n',
        vm
      )
    }
  }
  return (cache[key] = res)
}

function makeFunction (code) {
  try {
    return new Function(code)
  } catch (e) {
    return noop
  }
}

/*  */

var splitRE = /\r?\n/g
var isSpecialTag$1 = makeMap('script,style,template', true)



/**
 * Parse a single-file component (*.vue) file into an SFC Descriptor Object.
 */
function parseComponent (
  content,
  options
 ) {
  if ( options === void 0 ) options = {};

  var sfc = {
    template: null,
    script: null,
    styles: []
  }
  var depth = 0
  var currentBlock = null

  function start (
    tag,
    attrs,
    unary,
    start,
    end
  ) {
    if (isSpecialTag$1(tag) && depth === 0) {
      currentBlock = {
        type: tag,
        content: '',
        start: end
      }
      checkAttrs(currentBlock, attrs)
      if (tag === 'style') {
        sfc.styles.push(currentBlock)
      } else {
        sfc[tag] = currentBlock
      }
    }
    if (!unary) {
      depth++
    }
  }

  function checkAttrs (block, attrs) {
    for (var i = 0; i < attrs.length; i++) {
      var attr = attrs[i]
      if (attr.name === 'lang') {
        block.lang = attr.value
      }
      if (attr.name === 'scoped') {
        block.scoped = true
      }
      if (attr.name === 'src') {
        block.src = attr.value
      }
    }
  }

  function end (tag, start, end) {
    if (isSpecialTag$1(tag) && depth === 1 && currentBlock) {
      currentBlock.end = start
      var text = deindent(content.slice(currentBlock.start, currentBlock.end))
      // pad content so that linters and pre-processors can output correct
      // line numbers in errors and warnings
      if (currentBlock.type !== 'template' && options.pad) {
        text = padContent(currentBlock) + text
      }
      currentBlock.content = text
      currentBlock = null
    }
    depth--
  }

  function padContent (block) {
    var offset = content.slice(0, block.start).split(splitRE).length
    var padChar = block.type === 'script' && !block.lang
      ? '//\n'
      : '\n'
    return Array(offset).join(padChar)
  }

  parseHTML(content, {
    start: start,
    end: end
  })

  return sfc
}

/*  */

function compile (
  template,
  options
) {
  options = options || {}
  var errors = []
  // allow injecting modules/directives
  var baseModules = baseOptions.modules || []
  var modules = options.modules
    ? baseModules.concat(options.modules)
    : baseModules
  var directives = options.directives
    ? extend(extend({}, baseOptions.directives), options.directives)
    : baseOptions.directives
  var compiled = compile$1(template, {
    modules: modules,
    directives: directives,
    warn: function (msg) {
      errors.push(msg)
    }
  })
  compiled.errors = errors.concat(detectErrors(compiled.ast))
  return compiled
}

exports.compile = compile;
exports.parseComponent = parseComponent;
exports.compileToFunctions = compileToFunctions;