vue/packages/weex-vue-framework/index.js

'use strict';

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

/*  */

/**
 * 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);
  return isNaN(n) ? val : n
}

/**
 * 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-delimited 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 = {};
  for (var i = 0; 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; };

/**
 * Return same value
 */
var identity = function (_) { return _; };

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

/**
 * Check if two values are loosely equal - that is,
 * if they are plain objects, do they have the same shape?
 */
function looseEqual (a, b) {
  var isObjectA = isObject(a);
  var isObjectB = isObject(b);
  if (isObjectA && isObjectB) {
    return JSON.stringify(a) === JSON.stringify(b)
  } else if (!isObjectA && !isObjectB) {
    return String(a) === String(b)
  } else {
    return false
  }
}

function looseIndexOf (arr, val) {
  for (var i = 0; i < arr.length; i++) {
    if (looseEqual(arr[i], val)) { return i }
  }
  return -1
}

/*  */

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: [],

  /**
   * 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,

  /**
   * Parse the real tag name for the specific platform.
   */
  parsePlatformTagName: identity,

  /**
   * 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
};

/*  */

/**
 * 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
    }
  }
}

/*  */
/* globals MutationObserver */

// can we use __proto__?
var hasProto = '__proto__' in {};

// Browser environment sniffing
var inBrowser = typeof window !== 'undefined';
var UA = inBrowser && window.navigator.userAgent.toLowerCase();
var isIE = UA && /msie|trident/.test(UA);
var isIE9 = UA && UA.indexOf('msie 9.0') > 0;
var isEdge = UA && UA.indexOf('edge/') > 0;
var isAndroid = UA && UA.indexOf('android') > 0;
var isIOS = UA && /iphone|ipad|ipod|ios/.test(UA);

// this needs to be lazy-evaled because vue may be required before
// vue-server-renderer can set VUE_ENV
var _isServer;
var isServerRendering = function () {
  if (_isServer === undefined) {
    /* istanbul ignore if */
    if (!inBrowser && typeof global !== 'undefined') {
      // detect presence of vue-server-renderer and avoid
      // Webpack shimming the process
      _isServer = global['process'].env.VUE_ENV === 'server';
    } else {
      _isServer = false;
    }
  }
  return _isServer
};

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

/* istanbul ignore next */
function isNative (Ctor) {
  return /native code/.test(Ctor.toString())
}

/**
 * Defer a task to execute it asynchronously.
 */
var nextTick = (function () {
  var callbacks = [];
  var pending = false;
  var timerFunc;

  function nextTickHandler () {
    pending = false;
    var copies = callbacks.slice(0);
    callbacks.length = 0;
    for (var i = 0; i < copies.length; i++) {
      copies[i]();
    }
  }

  // the nextTick behavior leverages the microtask queue, which can be accessed
  // via either native Promise.then or MutationObserver.
  // MutationObserver has wider support, however it is seriously bugged in
  // UIWebView in iOS >= 9.3.3 when triggered in touch event handlers. It
  // completely stops working after triggering a few times... so, if native
  // Promise is available, we will use it:
  /* istanbul ignore if */
  if (typeof Promise !== 'undefined' && isNative(Promise)) {
    var p = Promise.resolve();
    var logError = function (err) { console.error(err); };
    timerFunc = function () {
      p.then(nextTickHandler).catch(logError);
      // in problematic UIWebViews, Promise.then doesn't completely break, but
      // it can get stuck in a weird state where callbacks are pushed into the
      // microtask queue but the queue isn't being flushed, until the browser
      // needs to do some other work, e.g. handle a timer. Therefore we can
      // "force" the microtask queue to be flushed by adding an empty timer.
      if (isIOS) { setTimeout(noop); }
    };
  } else if (typeof MutationObserver !== 'undefined' && (
    isNative(MutationObserver) ||
    // PhantomJS and iOS 7.x
    MutationObserver.toString() === '[object MutationObserverConstructor]'
  )) {
    // use MutationObserver where native Promise is not available,
    // e.g. PhantomJS IE11, iOS7, Android 4.4
    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 {
    // fallback to setTimeout
    /* istanbul ignore next */
    timerFunc = function () {
      setTimeout(nextTickHandler, 0);
    };
  }

  return function queueNextTick (cb, ctx) {
    var _resolve;
    callbacks.push(function () {
      if (cb) { cb.call(ctx); }
      if (_resolve) { _resolve(ctx); }
    });
    if (!pending) {
      pending = true;
      timerFunc();
    }
    if (!cb && typeof Promise !== 'undefined') {
      return new Promise(function (resolve) {
        _resolve = resolve;
      })
    }
  }
})();

var _Set;
/* istanbul ignore if */
if (typeof Set !== 'undefined' && isNative(Set)) {
  // 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] === true
    };
    Set.prototype.add = function add (key) {
      this.set[key] = true;
    };
    Set.prototype.clear = function clear () {
      this.set = Object.create(null);
    };

    return Set;
  }());
}

var warn = noop;
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.$options._componentTag
      : vm.name;
    return (
      (name ? ("component <" + name + ">") : "anonymous component") +
      (vm._isVue && vm.$options.__file ? (" at " + (vm.$options.__file)) : '')
    )
  };

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

/*  */


var uid$1 = 0;

/**
 * A dep is an observable that can have multiple
 * directives subscribing to it.
 */
var Dep = function Dep () {
  this.id = uid$1++;
  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();
}

/*
 * 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);[
  '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 keys = Object.keys(obj);
  for (var i = 0; i < keys.length; i++) {
    defineReactive$$1(obj, keys[i], obj[keys[i]]);
  }
};

/**
 * 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, asRootData) {
  if (!isObject(value)) {
    return
  }
  var ob;
  if (hasOwn(value, '__ob__') && value.__ob__ instanceof Observer) {
    ob = value.__ob__;
  } else if (
    observerState.shouldConvert &&
    !isServerRendering() &&
    (Array.isArray(value) || isPlainObject(value)) &&
    Object.isExtensible(value) &&
    !value._isVue
  ) {
    ob = new Observer(value);
  }
  if (asRootData && ob) {
    ob.vmCount++;
  }
  return ob
}

/**
 * Define a reactive property on an Object.
 */
function defineReactive$$1 (
  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)) {
          dependArray(value);
        }
      }
      return value
    },
    set: function reactiveSetter (newVal) {
      var value = getter ? getter.call(obj) : val;
      /* eslint-disable no-self-compare */
      if (newVal === value || (newVal !== newVal && value !== value)) {
        return
      }
      /* eslint-enable no-self-compare */
      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$1 (obj, key, val) {
  if (Array.isArray(obj)) {
    obj.length = Math.max(obj.length, key);
    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$$1(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();
}

/**
 * Collect dependencies on array elements when the array is touched, since
 * we cannot intercept array element access like property getters.
 */
function dependArray (value) {
  for (var e = (void 0), i = 0, l = value.length; i < l; i++) {
    e = value[i];
    e && e.__ob__ && e.__ob__.dep.depend();
    if (Array.isArray(e)) {
      dependArray(e);
    }
  }
}

/*  */

/**
 * 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)
  };
}

/**
 * Helper that recursively merges two data objects together.
 */
function mergeData (to, from) {
  if (!from) { return to }
  var key, toVal, fromVal;
  var keys = Object.keys(from);
  for (var i = 0; i < keys.length; i++) {
    key = keys[i];
    toVal = to[key];
    fromVal = from[key];
    if (!hasOwn(to, key)) {
      set$1(to, key, fromVal);
    } else if (isPlainObject(toVal) && isPlainObject(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
};

/**
 * Validate component names
 */
function checkComponents (options) {
  for (var key in options.components) {
    var lower = key.toLowerCase();
    if (isBuiltInTag(lower) || config.isReservedTag(lower)) {
      warn(
        'Do not use built-in or reserved HTML elements as component ' +
        'id: ' + key
      );
    }
  }
}

/**
 * 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
) {
  if (process.env.NODE_ENV !== 'production') {
    checkComponents(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$2) {
        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];
  // check local registration variations first
  if (hasOwn(assets, id)) { return assets[id] }
  var camelizedId = camelize(id);
  if (hasOwn(assets, camelizedId)) { return assets[camelizedId] }
  var PascalCaseId = capitalize(camelizedId);
  if (hasOwn(assets, PascalCaseId)) { return assets[PascalCaseId] }
  // fallback to prototype chain
  var res = assets[id] || assets[camelizedId] || assets[PascalCaseId];
  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
) {
  var prop = propOptions[key];
  var absent = !hasOwn(propsData, key);
  var value = propsData[key];
  // handle boolean props
  if (isType(Boolean, prop.type)) {
    if (absent && !hasOwn(prop, 'default')) {
      value = false;
    } else if (!isType(String, prop.type) && (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, key) {
  // 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 "' + key + '": ' +
      'Props with type Object/Array must use a factory function ' +
      'to return the default value.',
      vm
    );
  }
  // the raw prop value was also undefined from previous render,
  // return previous default value to avoid unnecessary watcher trigger
  if (vm && vm.$options.propsData &&
    vm.$options.propsData[key] === undefined &&
    vm[key] !== undefined) {
    return vm[key]
  }
  // 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 || type === true;
  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]
}

function isType (type, fn) {
  if (!Array.isArray(fn)) {
    return getType(fn) === getType(type)
  }
  for (var i = 0, len = fn.length; i < len; i++) {
    if (getType(fn[i]) === getType(type)) {
      return true
    }
  }
  /* istanbul ignore next */
  return false
}



var util = Object.freeze({
	defineReactive: defineReactive$$1,
	_toString: _toString,
	toNumber: toNumber,
	makeMap: makeMap,
	isBuiltInTag: isBuiltInTag,
	remove: remove,
	hasOwn: hasOwn,
	isPrimitive: isPrimitive,
	cached: cached,
	camelize: camelize,
	capitalize: capitalize,
	hyphenate: hyphenate,
	bind: bind,
	toArray: toArray,
	extend: extend,
	isObject: isObject,
	isPlainObject: isPlainObject,
	toObject: toObject,
	noop: noop,
	no: no,
	identity: identity,
	genStaticKeys: genStaticKeys,
	looseEqual: looseEqual,
	looseIndexOf: looseIndexOf,
	isReserved: isReserved,
	def: def,
	parsePath: parsePath,
	hasProto: hasProto,
	inBrowser: inBrowser,
	UA: UA,
	isIE: isIE,
	isIE9: isIE9,
	isEdge: isEdge,
	isAndroid: isAndroid,
	isIOS: isIOS,
	isServerRendering: isServerRendering,
	devtools: devtools,
	nextTick: nextTick,
	get _Set () { return _Set; },
	mergeOptions: mergeOptions,
	resolveAsset: resolveAsset,
	get warn () { return warn; },
	get formatComponentName () { return formatComponentName; },
	validateProp: validateProp
});

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

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
  );

  var warnNonPresent = function (target, key) {
    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
    );
  };

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

  if (hasProxy) {
    var isBuiltInModifier = makeMap('stop,prevent,self,ctrl,shift,alt,meta');
    config.keyCodes = new Proxy(config.keyCodes, {
      set: function set (target, key, value) {
        if (isBuiltInModifier(key)) {
          warn(("Avoid overwriting built-in modifier in config.keyCodes: ." + key));
          return false
        } else {
          target[key] = value;
          return true
        }
      }
    });
  }

  var hasHandler = {
    has: function has (target, key) {
      var has = key in target;
      var isAllowed = allowedGlobals(key) || key.charAt(0) === '_';
      if (!has && !isAllowed) {
        warnNonPresent(target, key);
      }
      return has || !isAllowed
    }
  };

  var getHandler = {
    get: function get (target, key) {
      if (typeof key === 'string' && !(key in target)) {
        warnNonPresent(target, key);
      }
      return target[key]
    }
  };

  initProxy = function initProxy (vm) {
    if (hasProxy) {
      // determine which proxy handler to use
      var options = vm.$options;
      var handlers = options.render && options.render._withStripped
        ? getHandler
        : hasHandler;
      vm._renderProxy = new Proxy(vm, handlers);
    } else {
      vm._renderProxy = vm;
    }
  };
}

/*  */

var VNode = function VNode (
  tag,
  data,
  children,
  text,
  elm,
  context,
  componentOptions
) {
  this.tag = tag;
  this.data = data;
  this.children = children;
  this.text = text;
  this.elm = elm;
  this.ns = undefined;
  this.context = context;
  this.functionalContext = undefined;
  this.key = data && data.key;
  this.componentOptions = componentOptions;
  this.componentInstance = undefined;
  this.parent = undefined;
  this.raw = false;
  this.isStatic = false;
  this.isRootInsert = true;
  this.isComment = false;
  this.isCloned = false;
  this.isOnce = false;
};

var prototypeAccessors = { child: {} };

// DEPRECATED: alias for componentInstance for backwards compat.
/* istanbul ignore next */
prototypeAccessors.child.get = function () {
  return this.componentInstance
};

Object.defineProperties( VNode.prototype, prototypeAccessors );

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

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

// 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.context,
    vnode.componentOptions
  );
  cloned.ns = vnode.ns;
  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
}

/*  */

var hooks = { init: init$1, prepatch: prepatch, insert: insert, destroy: destroy$1 };
var hooksToMerge = Object.keys(hooks);

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

  var baseCtor = context.$options._base;
  if (isObject(Ctor)) {
    Ctor = baseCtor.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, baseCtor, 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
      }
    }
  }

  // resolve constructor options in case global mixins are applied after
  // component constructor creation
  resolveConstructorOptions(Ctor);

  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, 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);
    }
  }
  // ensure the createElement function in functional components
  // gets a unique context - this is necessary for correct named slot check
  var _context = Object.create(context);
  var h = function (a, b, c, d) { return createElement(_context, a, b, c, d, true); };
  var vnode = Ctor.options.render.call(null, h, {
    props: props,
    data: data,
    parent: context,
    children: children,
    slots: function () { return resolveSlots(children, context); }
  });
  if (vnode instanceof VNode) {
    vnode.functionalContext = context;
    if (data.slot) {
      (vnode.data || (vnode.data = {})).slot = data.slot;
    }
  }
  return vnode
}

function createComponentInstanceForVnode (
  vnode, // we know it's MountedComponentVNode but flow doesn't
  parent, // activeInstance in lifecycle state
  parentElm,
  refElm
) {
  var vnodeComponentOptions = vnode.componentOptions;
  var options = {
    _isComponent: true,
    parent: parent,
    propsData: vnodeComponentOptions.propsData,
    _componentTag: vnodeComponentOptions.tag,
    _parentVnode: vnode,
    _parentListeners: vnodeComponentOptions.listeners,
    _renderChildren: vnodeComponentOptions.children,
    _parentElm: parentElm || null,
    _refElm: refElm || null
  };
  // 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$1 (
  vnode,
  hydrating,
  parentElm,
  refElm
) {
  if (!vnode.componentInstance || vnode.componentInstance._isDestroyed) {
    var child = vnode.componentInstance = createComponentInstanceForVnode(
      vnode,
      activeInstance,
      parentElm,
      refElm
    );
    child.$mount(hydrating ? vnode.elm : undefined, hydrating);
  } else if (vnode.data.keepAlive) {
    // kept-alive components, treat as a patch
    var mountedNode = vnode; // work around flow
    prepatch(mountedNode, mountedNode);
  }
}

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

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

function destroy$1 (vnode) {
  if (!vnode.componentInstance._isDestroyed) {
    if (!vnode.data.keepAlive) {
      vnode.componentInstance.$destroy();
    } else {
      vnode.componentInstance._inactive = true;
      callHook(vnode.componentInstance, 'deactivated');
    }
  }
}

function resolveAsyncComponent (
  factory,
  baseCtor,
  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 = baseCtor.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 extracting 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 (one, two) {
  return function (a, b, c, d) {
    one(a, b, c, d);
    two(a, b, c, d);
  }
}

/*  */

function mergeVNodeHook (def, hookKey, hook, key) {
  key = key + hookKey;
  var injectedHash = def.__injected || (def.__injected = {});
  if (!injectedHash[key]) {
    injectedHash[key] = true;
    var oldHook = def[hookKey];
    if (oldHook) {
      def[hookKey] = function () {
        oldHook.apply(this, arguments);
        hook.apply(this, arguments);
      };
    } else {
      def[hookKey] = hook;
    }
  }
}

/*  */

var normalizeEvent = cached(function (name) {
  var once = name.charAt(0) === '~'; // Prefixed last, checked first
  name = once ? name.slice(1) : name;
  var capture = name.charAt(0) === '!';
  name = capture ? name.slice(1) : name;
  return {
    name: name,
    once: once,
    capture: capture
  }
});

function createEventHandle (fn) {
  var handle = {
    fn: fn,
    invoker: function () {
      var arguments$1 = arguments;

      var fn = handle.fn;
      if (Array.isArray(fn)) {
        for (var i = 0; i < fn.length; i++) {
          fn[i].apply(null, arguments$1);
        }
      } else {
        fn.apply(null, arguments);
      }
    }
  };
  return handle
}

function updateListeners (
  on,
  oldOn,
  add,
  remove$$1,
  vm
) {
  var name, cur, old, event;
  for (name in on) {
    cur = on[name];
    old = oldOn[name];
    event = normalizeEvent(name);
    if (!cur) {
      process.env.NODE_ENV !== 'production' && warn(
        "Invalid handler for event \"" + (event.name) + "\": got " + String(cur),
        vm
      );
    } else if (!old) {
      if (!cur.invoker) {
        cur = on[name] = createEventHandle(cur);
      }
      add(event.name, cur.invoker, event.once, event.capture);
    } else if (cur !== old) {
      old.fn = cur;
      on[name] = old;
    }
  }
  for (name in oldOn) {
    if (!on[name]) {
      event = normalizeEvent(name);
      remove$$1(event.name, oldOn[name].invoker, event.capture);
    }
  }
}

/*  */

// The template compiler attempts to minimize the need for normalization by
// statically analyzing the template at compile time.
//
// For plain HTML markup, normalization can be completely skipped because the
// generated render function is guaranteed to return Array<VNode>. There are
// two cases where extra normalization is needed:

// 1. When the children contains components - because a functional component
// may return an Array instead of a single root. In this case, just a simple
// nomralization is needed - if any child is an Array, we flatten the whole
// thing with Array.prototype.concat. It is guaranteed to be only 1-level deep
// because functional components already normalize their own children.
function simpleNormalizeChildren (children) {
  for (var i = 0; i < children.length; i++) {
    if (Array.isArray(children[i])) {
      return Array.prototype.concat.apply([], children)
    }
  }
  return children
}

// 2. When the children contains constrcuts that always generated nested Arrays,
// e.g. <template>, <slot>, v-for, or when the children is provided by user
// with hand-written render functions / JSX. In such cases a full normalization
// is needed to cater to all possible types of children values.
function normalizeChildren (children) {
  return isPrimitive(children)
    ? [createTextVNode(children)]
    : Array.isArray(children)
      ? normalizeArrayChildren(children)
      : undefined
}

function normalizeArrayChildren (children, nestedIndex) {
  var res = [];
  var i, c, last;
  for (i = 0; i < children.length; i++) {
    c = children[i];
    if (c == null || typeof c === 'boolean') { continue }
    last = res[res.length - 1];
    //  nested
    if (Array.isArray(c)) {
      res.push.apply(res, normalizeArrayChildren(c, ((nestedIndex || '') + "_" + 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.text && last && last.text) {
        res[res.length - 1] = createTextVNode(last.text + c.text);
      } else {
        // default key for nested array children (likely generated by v-for)
        if (c.tag && c.key == null && nestedIndex != null) {
          c.key = "__vlist" + nestedIndex + "_" + i + "__";
        }
        res.push(c);
      }
    }
  }
  return res
}

/*  */

function getFirstComponentChild (children) {
  return children && children.filter(function (c) { return c && c.componentOptions; })[0]
}

/*  */

var SIMPLE_NORMALIZE = 1;
var ALWAYS_NORMALIZE = 2;

// wrapper function for providing a more flexible interface
// without getting yelled at by flow
function createElement (
  context,
  tag,
  data,
  children,
  normalizationType,
  alwaysNormalize
) {
  if (Array.isArray(data) || isPrimitive(data)) {
    normalizationType = children;
    children = data;
    data = undefined;
  }
  if (alwaysNormalize) { normalizationType = ALWAYS_NORMALIZE; }
  return _createElement(context, tag, data, children, normalizationType)
}

function _createElement (
  context,
  tag,
  data,
  children,
  normalizationType
) {
  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 createEmptyVNode()
  }
  if (!tag) {
    // in case of component :is set to falsy value
    return createEmptyVNode()
  }
  // support single function children as default scoped slot
  if (Array.isArray(children) &&
      typeof children[0] === 'function') {
    data = data || {};
    data.scopedSlots = { default: children[0] };
    children.length = 0;
  }
  if (normalizationType === ALWAYS_NORMALIZE) {
    children = normalizeChildren(children);
  } else if (normalizationType === SIMPLE_NORMALIZE) {
    children = simpleNormalizeChildren(children);
  }
  var vnode, ns;
  if (typeof tag === 'string') {
    var Ctor;
    ns = config.getTagNamespace(tag);
    if (config.isReservedTag(tag)) {
      // platform built-in elements
      vnode = new VNode(
        config.parsePlatformTagName(tag), data, children,
        undefined, undefined, context
      );
    } else if ((Ctor = resolveAsset(context.$options, 'components', tag))) {
      // component
      vnode = 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
      vnode = new VNode(
        tag, data, children,
        undefined, undefined, context
      );
    }
  } else {
    // direct component options / constructor
    vnode = createComponent(tag, data, context, children);
  }
  if (vnode) {
    if (ns) { applyNS(vnode, ns); }
    return vnode
  } else {
    return createEmptyVNode()
  }
}

function applyNS (vnode, ns) {
  vnode.ns = ns;
  if (vnode.tag === 'foreignObject') {
    // use default namespace inside foreignObject
    return
  }
  if (vnode.children) {
    for (var i = 0, l = vnode.children.length; i < l; i++) {
      var child = vnode.children[i];
      if (child.tag && !child.ns) {
        applyNS(child, ns);
      }
    }
  }
}

/*  */

function initRender (vm) {
  vm.$vnode = null; // the placeholder node in parent tree
  vm._vnode = null; // the root of the child tree
  vm._staticTrees = null;
  var parentVnode = vm.$options._parentVnode;
  var renderContext = parentVnode && parentVnode.context;
  vm.$slots = resolveSlots(vm.$options._renderChildren, renderContext);
  vm.$scopedSlots = {};
  // bind the createElement fn to this instance
  // so that we get proper render context inside it.
  // args order: tag, data, children, normalizationType, alwaysNormalize
  // internal version is used by render functions compiled from templates
  vm._c = function (a, b, c, d) { return createElement(vm, a, b, c, d, false); };
  // normalization is always applied for the public version, used in
  // user-written render functions.
  vm.$createElement = function (a, b, c, d) { return createElement(vm, a, b, c, d, true); };
}

function renderMixin (Vue) {
  Vue.prototype.$nextTick = function (fn) {
    return 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 (vm._isMounted) {
      // clone slot nodes on re-renders
      for (var key in vm.$slots) {
        vm.$slots[key] = cloneVNodes(vm.$slots[key]);
      }
    }

    if (_parentVnode && _parentVnode.data.scopedSlots) {
      vm.$scopedSlots = _parentVnode.data.scopedSlots;
    }

    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) {
      /* istanbul ignore else */
      if (config.errorHandler) {
        config.errorHandler.call(null, e, vm);
      } else {
        if (process.env.NODE_ENV !== 'production') {
          warn(("Error when rendering " + (formatComponentName(vm)) + ":"));
        }
        throw e
      }
      // 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 = createEmptyVNode();
    }
    // set parent
    vnode.parent = _parentVnode;
    return vnode
  };

  // toString for mustaches
  Vue.prototype._s = _toString;
  // convert text to vnode
  Vue.prototype._v = createTextVNode;
  // number conversion
  Vue.prototype._n = toNumber;
  // empty vnode
  Vue.prototype._e = createEmptyVNode;
  // loose equal
  Vue.prototype._q = looseEqual;
  // loose indexOf
  Vue.prototype._i = looseIndexOf;

  // 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);
    markStatic(tree, ("__static__" + index), false);
    return tree
  };

  // mark node as static (v-once)
  Vue.prototype._o = function markOnce (
    tree,
    index,
    key
  ) {
    markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
    return tree
  };

  function markStatic (tree, key, isOnce) {
    if (Array.isArray(tree)) {
      for (var i = 0; i < tree.length; i++) {
        if (tree[i] && typeof tree[i] !== 'string') {
          markStaticNode(tree[i], (key + "_" + i), isOnce);
        }
      }
    } else {
      markStaticNode(tree, key, isOnce);
    }
  }

  function markStaticNode (node, key, isOnce) {
    node.isStatic = true;
    node.key = key;
    node.isOnce = isOnce;
  }

  // filter resolution helper
  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) || typeof val === 'string') {
      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,
    props,
    bindObject
  ) {
    var scopedSlotFn = this.$scopedSlots[name];
    if (scopedSlotFn) { // scoped slot
      props = props || {};
      if (bindObject) {
        extend(props, bindObject);
      }
      return scopedSlotFn(props) || fallback
    } else {
      var slotNodes = this.$slots[name];
      // warn duplicate slot usage
      if (slotNodes && process.env.NODE_ENV !== 'production') {
        slotNodes._rendered && warn(
          "Duplicate presence of slot \"" + name + "\" found in the same render tree " +
          "- this will likely cause render errors.",
          this
        );
        slotNodes._rendered = true;
      }
      return slotNodes || fallback
    }
  };

  // apply v-bind object
  Vue.prototype._b = function bindProps (
    data,
    tag,
    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);
        }
        for (var key in value) {
          if (key === 'class' || key === 'style') {
            data[key] = value[key];
          } else {
            var type = data.attrs && data.attrs.type;
            var hash = asProp || config.mustUseProp(tag, type, key)
              ? data.domProps || (data.domProps = {})
              : data.attrs || (data.attrs = {});
            hash[key] = value[key];
          }
        }
      }
    }
    return data
  };

  // check v-on keyCodes
  Vue.prototype._k = function checkKeyCodes (
    eventKeyCode,
    key,
    builtInAlias
  ) {
    var keyCodes = config.keyCodes[key] || builtInAlias;
    if (Array.isArray(keyCodes)) {
      return keyCodes.indexOf(eventKeyCode) === -1
    } else {
      return keyCodes !== eventKeyCode
    }
  };
}

function resolveSlots (
  children,
  context
) {
  var slots = {};
  if (!children) {
    return slots
  }
  var defaultSlot = [];
  var name, child;
  for (var i = 0, l = children.length; i < l; i++) {
    child = children[i];
    // named slots should only be respected if the vnode was rendered in the
    // same context.
    if ((child.context === context || child.functionalContext === context) &&
        child.data && (name = 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);
  vm._hasHookEvent = false;
  // init parent attached events
  var listeners = vm.$options._parentListeners;
  if (listeners) {
    updateComponentListeners(vm, listeners);
  }
}

var target;

function add$1 (event, fn, once) {
  if (once) {
    target.$once(event, fn);
  } else {
    target.$on(event, fn);
  }
}

function remove$1 (event, fn) {
  target.$off(event, fn);
}

function updateComponentListeners (
  vm,
  listeners,
  oldListeners
) {
  target = vm;
  updateListeners(listeners, oldListeners || {}, add$1, remove$1, vm);
}

function eventsMixin (Vue) {
  var hookRE = /^hook:/;
  Vue.prototype.$on = function (event, fn) {
    var vm = this;(vm._events[event] || (vm._events[event] = [])).push(fn);
    // optimize hook:event cost by using a boolean flag marked at registration
    // instead of a hash lookup
    if (hookRE.test(event)) {
      vm._hasHookEvent = true;
    }
    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 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.$options.render = createEmptyVNode;
      if (process.env.NODE_ENV !== 'production') {
        /* istanbul ignore if */
        if (vm.$options.template && vm.$options.template.charAt(0) !== '#') {
          warn(
            'You are using the runtime-only build of Vue where the template ' +
            'option is not available. Either pre-compile the templates into ' +
            'render functions, or use the compiler-included build.',
            vm
          );
        } else {
          warn(
            'Failed to mount component: template or render function not defined.',
            vm
          );
        }
      }
    }
    callHook(vm, 'beforeMount');
    vm._watcher = new Watcher(vm, function updateComponent () {
      vm._update(vm._render(), hydrating);
    }, noop);
    hydrating = false;
    // manually mounted instance, call mounted on self
    // mounted is called for render-created child components in its inserted hook
    if (vm.$vnode == null) {
      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.$el;
    var prevVnode = vm._vnode;
    var prevActiveInstance = activeInstance;
    activeInstance = vm;
    vm._vnode = vnode;
    // Vue.prototype.__patch__ is injected in entry points
    // based on the rendering backend used.
    if (!prevVnode) {
      // initial render
      vm.$el = vm.__patch__(
        vm.$el, vnode, hydrating, false /* removeOnly */,
        vm.$options._parentElm,
        vm.$options._refElm
      );
    } else {
      // updates
      vm.$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;
    }
    // updated hook is called by the scheduler to ensure that children are
    // updated in a parent's updated hook.
  };

  Vue.prototype._updateFromParent = function (
    propsData,
    listeners,
    parentVnode,
    renderChildren
  ) {
    var vm = this;
    var hasChildren = !!(vm.$options._renderChildren || renderChildren);
    vm.$options._parentVnode = parentVnode;
    vm.$vnode = parentVnode; // update vm's placeholder node without re-render
    if (vm._vnode) { // update child tree's parent
      vm._vnode.parent = parentVnode;
    }
    vm.$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.$options.props, propsData, vm);
      }
      observerState.shouldConvert = true;
      if (process.env.NODE_ENV !== 'production') {
        observerState.isSettingProps = false;
      }
      vm.$options.propsData = propsData;
    }
    // update listeners
    if (listeners) {
      var oldListeners = vm.$options._parentListeners;
      vm.$options._parentListeners = listeners;
      updateComponentListeners(vm, listeners, oldListeners);
    }
    // resolve slots + force update if has children
    if (hasChildren) {
      vm.$slots = resolveSlots(renderChildren, parentVnode.context);
      vm.$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;
    }
    // invoke destroy hooks on current rendered tree
    vm.__patch__(vm._vnode, null);
  };
}

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

/*  */


var queue = [];
var has$1 = {};
var circular = {};
var waiting = false;
var flushing = false;
var index = 0;

/**
 * Reset the scheduler's state.
 */
function resetSchedulerState () {
  queue.length = 0;
  has$1 = {};
  if (process.env.NODE_ENV !== 'production') {
    circular = {};
  }
  waiting = flushing = false;
}

/**
 * Flush both queues and run the watchers.
 */
function flushSchedulerQueue () {
  flushing = true;
  var watcher, id, vm;

  // 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++) {
    watcher = queue[index];
    id = watcher.id;
    has$1[id] = null;
    watcher.run();
    // in dev build, check and stop circular updates.
    if (process.env.NODE_ENV !== 'production' && has$1[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
      }
    }
  }

  // call updated hooks
  index = queue.length;
  while (index--) {
    watcher = queue[index];
    vm = watcher.vm;
    if (vm._watcher === watcher && vm._isMounted) {
      callHook(vm, 'updated');
    }
  }

  // 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$1[id] == null) {
    has$1[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$2 = 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
) {
  this.vm = vm;
  vm._watchers.push(this);
  // options
  if (options) {
    this.deep = !!options.deep;
    this.user = !!options.user;
    this.lazy = !!options.lazy;
    this.sync = !!options.sync;
  } else {
    this.deep = this.user = this.lazy = this.sync = false;
  }
  this.cb = cb;
  this.id = ++uid$2; // 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();
  this.expression = process.env.NODE_ENV !== 'production'
    ? expOrFn.toString()
    : '';
  // 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) {
          /* istanbul ignore else */
          if (config.errorHandler) {
            config.errorHandler.call(null, e, this.vm);
          } else {
            process.env.NODE_ENV !== 'production' && warn(
              ("Error in watcher \"" + (this.expression) + "\""),
              this.vm
            );
            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' subscriber 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.
    if (!this.vm._isBeingDestroyed) {
      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) {
  seenObjects.clear();
  _traverse(val, seenObjects);
}

function _traverse (val, seen) {
  var i, keys;
  var isA = Array.isArray(val);
  if ((!isA && !isObject(val)) || !Object.isExtensible(val)) {
    return
  }
  if (val.__ob__) {
    var depId = val.__ob__.dep.id;
    if (seen.has(depId)) {
      return
    }
    seen.add(depId);
  }
  if (isA) {
    i = val.length;
    while (i--) { _traverse(val[i], seen); }
  } else {
    keys = Object.keys(val);
    i = keys.length;
    while (i--) { _traverse(val[keys[i]], seen); }
  }
}

/*  */

function initState (vm) {
  vm._watchers = [];
  var opts = vm.$options;
  if (opts.props) { initProps(vm, opts.props); }
  if (opts.methods) { initMethods(vm, opts.methods); }
  if (opts.data) {
    initData(vm);
  } else {
    observe(vm._data = {}, true /* asRootData */);
  }
  if (opts.computed) { initComputed(vm, opts.computed); }
  if (opts.watch) { initWatch(vm, opts.watch); }
}

var isReservedProp = { key: 1, ref: 1, slot: 1 };

function initProps (vm, props) {
  var propsData = vm.$options.propsData || {};
  var keys = vm.$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') {
      if (isReservedProp[key]) {
        warn(
          ("\"" + key + "\" is a reserved attribute and cannot be used as component prop."),
          vm
        );
      }
      defineReactive$$1(vm, key, validateProp(key, props, propsData, vm), function () {
        if (vm.$parent && !observerState.isSettingProps) {
          warn(
            "Avoid mutating a prop directly since the value will be " +
            "overwritten whenever the parent component re-renders. " +
            "Instead, use a data or computed property based on the prop's " +
            "value. Prop being mutated: \"" + key + "\"",
            vm
          );
        }
      });
    } else {
      defineReactive$$1(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.$options.data;
  data = vm._data = typeof data === 'function'
    ? data.call(vm)
    : data || {};
  if (!isPlainObject(data)) {
    data = {};
    process.env.NODE_ENV !== 'production' && warn(
      'data functions should return an object:\n' +
      'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
      vm
    );
  }
  // proxy data on instance
  var keys = Object.keys(data);
  var props = vm.$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, true /* asRootData */);
}

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

function initComputed (vm, computed) {
  for (var key in computed) {
    /* istanbul ignore if */
    if (process.env.NODE_ENV !== 'production' && key in vm) {
      warn(
        "existing instance property \"" + key + "\" will be " +
        "overwritten by a computed property with the same name.",
        vm
      );
    }
    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, methods) {
  for (var key in methods) {
    vm[key] = methods[key] == null ? noop : bind(methods[key], vm);
    if (process.env.NODE_ENV !== 'production' && methods[key] == null) {
      warn(
        "method \"" + key + "\" has an undefined value in the component definition. " +
        "Did you reference the function correctly?",
        vm
      );
    }
  }
}

function initWatch (vm, 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$1;
  Vue.prototype.$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 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.$options = mergeOptions(
        resolveConstructorOptions(vm.constructor),
        options || {},
        vm
      );
    }
    /* istanbul ignore else */
    if (process.env.NODE_ENV !== 'production') {
      initProxy(vm);
    } else {
      vm._renderProxy = vm;
    }
    // expose real self
    vm._self = vm;
    initLifecycle(vm);
    initEvents(vm);
    initRender(vm);
    callHook(vm, 'beforeCreate');
    initState(vm);
    callHook(vm, 'created');
    if (vm.$options.el) {
      vm.$mount(vm.$options.el);
    }
  };
}

function initInternalComponent (vm, options) {
  var opts = vm.$options = Object.create(vm.constructor.options);
  // 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;
  opts._parentElm = options._parentElm;
  opts._refElm = options._refElm;
  if (options.render) {
    opts.render = options.render;
    opts.staticRenderFns = options.staticRenderFns;
  }
}

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

function Vue$2 (options) {
  if (process.env.NODE_ENV !== 'production' &&
    !(this instanceof Vue$2)) {
    warn('Vue is a constructor and should be called with the `new` keyword');
  }
  this._init(options);
}

initMixin(Vue$2);
stateMixin(Vue$2);
eventsMixin(Vue$2);
lifecycleMixin(Vue$2);
renderMixin(Vue$2);

/*  */

function initUse (Vue) {
  Vue.use = function (plugin) {
    /* istanbul ignore if */
    if (plugin.installed) {
      return
    }
    // additional parameters
    var args = toArray(arguments, 1);
    args.unshift(this);
    if (typeof plugin.install === 'function') {
      plugin.install.apply(plugin, args);
    } else {
      plugin.apply(null, args);
    }
    plugin.installed = true;
    return this
  };
}

/*  */

function initMixin$1 (Vue) {
  Vue.mixin = function (mixin) {
    this.options = mergeOptions(this.options, mixin);
  };
}

/*  */

function initExtend (Vue) {
  /**
   * Each instance constructor, including Vue, has a unique
   * cid. This enables us to create wrapped "child
   * constructors" for prototypal inheritance and cache them.
   */
  Vue.cid = 0;
  var cid = 1;

  /**
   * Class inheritance
   */
  Vue.extend = function (extendOptions) {
    extendOptions = extendOptions || {};
    var Super = this;
    var SuperId = Super.cid;
    var cachedCtors = extendOptions._Ctor || (extendOptions._Ctor = {});
    if (cachedCtors[SuperId]) {
      return cachedCtors[SuperId]
    }
    var name = extendOptions.name || Super.options.name;
    if (process.env.NODE_ENV !== 'production') {
      if (!/^[a-zA-Z][\w-]*$/.test(name)) {
        warn(
          'Invalid component name: "' + name + '". Component names ' +
          'can only contain alphanumeric characters and the hyphen, ' +
          'and must start with a letter.'
        );
      }
    }
    var Sub = function VueComponent (options) {
      this._init(options);
    };
    Sub.prototype = Object.create(Super.prototype);
    Sub.prototype.constructor = Sub;
    Sub.cid = cid++;
    Sub.options = mergeOptions(
      Super.options,
      extendOptions
    );
    Sub['super'] = Super;
    // allow further extension/mixin/plugin usage
    Sub.extend = Super.extend;
    Sub.mixin = Super.mixin;
    Sub.use = Super.use;
    // create asset registers, so extended classes
    // can have their private assets too.
    config._assetTypes.forEach(function (type) {
      Sub[type] = Super[type];
    });
    // enable recursive self-lookup
    if (name) {
      Sub.options.components[name] = Sub;
    }
    // keep a reference to the super options at extension time.
    // later at instantiation we can check if Super's options have
    // been updated.
    Sub.superOptions = Super.options;
    Sub.extendOptions = extendOptions;
    // cache constructor
    cachedCtors[SuperId] = Sub;
    return Sub
  };
}

/*  */

function initAssetRegisters (Vue) {
  /**
   * Create asset registration methods.
   */
  config._assetTypes.forEach(function (type) {
    Vue[type] = function (
      id,
      definition
    ) {
      if (!definition) {
        return this.options[type + 's'][id]
      } else {
        /* istanbul ignore if */
        if (process.env.NODE_ENV !== 'production') {
          if (type === 'component' && config.isReservedTag(id)) {
            warn(
              'Do not use built-in or reserved HTML elements as component ' +
              'id: ' + id
            );
          }
        }
        if (type === 'component' && isPlainObject(definition)) {
          definition.name = definition.name || id;
          definition = this.options._base.extend(definition);
        }
        if (type === 'directive' && typeof definition === 'function') {
          definition = { bind: definition, update: definition };
        }
        this.options[type + 's'][id] = definition;
        return definition
      }
    };
  });
}

/*  */

var patternTypes = [String, RegExp];

function getComponentName (opts) {
  return opts && (opts.Ctor.options.name || opts.tag)
}

function matches (pattern, name) {
  if (typeof pattern === 'string') {
    return pattern.split(',').indexOf(name) > -1
  } else {
    return pattern.test(name)
  }
}

function pruneCache (cache, filter) {
  for (var key in cache) {
    var cachedNode = cache[key];
    if (cachedNode) {
      var name = getComponentName(cachedNode.componentOptions);
      if (name && !filter(name)) {
        pruneCacheEntry(cachedNode);
        cache[key] = null;
      }
    }
  }
}

function pruneCacheEntry (vnode) {
  if (vnode) {
    if (!vnode.componentInstance._inactive) {
      callHook(vnode.componentInstance, 'deactivated');
    }
    vnode.componentInstance.$destroy();
  }
}

var KeepAlive = {
  name: 'keep-alive',
  abstract: true,

  props: {
    include: patternTypes,
    exclude: patternTypes
  },

  created: function created () {
    this.cache = Object.create(null);
  },

  destroyed: function destroyed () {
    var this$1 = this;

    for (var key in this.cache) {
      pruneCacheEntry(this$1.cache[key]);
    }
  },

  watch: {
    include: function include (val) {
      pruneCache(this.cache, function (name) { return matches(val, name); });
    },
    exclude: function exclude (val) {
      pruneCache(this.cache, function (name) { return !matches(val, name); });
    }
  },

  render: function render () {
    var vnode = getFirstComponentChild(this.$slots.default);
    var componentOptions = vnode && vnode.componentOptions;
    if (componentOptions) {
      // check pattern
      var name = getComponentName(componentOptions);
      if (name && (
        (this.include && !matches(this.include, name)) ||
        (this.exclude && matches(this.exclude, name))
      )) {
        return vnode
      }
      var key = vnode.key == null
        // same constructor may get registered as different local components
        // so cid alone is not enough (#3269)
        ? componentOptions.Ctor.cid + (componentOptions.tag ? ("::" + (componentOptions.tag)) : '')
        : vnode.key;
      if (this.cache[key]) {
        vnode.componentInstance = this.cache[key].componentInstance;
      } else {
        this.cache[key] = vnode;
      }
      vnode.data.keepAlive = true;
    }
    return vnode
  }
};

var builtInComponents = {
  KeepAlive: KeepAlive
};

/*  */

function initGlobalAPI (Vue) {
  // config
  var configDef = {};
  configDef.get = function () { return config; };
  if (process.env.NODE_ENV !== 'production') {
    configDef.set = function () {
      warn(
        'Do not replace the Vue.config object, set individual fields instead.'
      );
    };
  }
  Object.defineProperty(Vue, 'config', configDef);
  Vue.util = util;
  Vue.set = set$1;
  Vue.delete = del;
  Vue.nextTick = nextTick;

  Vue.options = Object.create(null);
  config._assetTypes.forEach(function (type) {
    Vue.options[type + 's'] = Object.create(null);
  });

  // this is used to identify the "base" constructor to extend all plain-object
  // components with in Weex's multi-instance scenarios.
  Vue.options._base = Vue;

  extend(Vue.options.components, builtInComponents);

  initUse(Vue);
  initMixin$1(Vue);
  initExtend(Vue);
  initAssetRegisters(Vue);
}

initGlobalAPI(Vue$2);

Object.defineProperty(Vue$2.prototype, '$isServer', {
  get: isServerRendering
});

Vue$2.version = '2.1.9';

var latestNodeId = 1;

function TextNode (text) {
  this.instanceId = '';
  this.nodeId = latestNodeId++;
  this.parentNode = null;
  this.nodeType = 3;
  this.text = text;
}

var renderer = {
  TextNode: TextNode,
  instances: {},
  modules: {},
  components: {}
};

var namespaceMap = {};

function createElement$1 (tagName) {
  return new renderer.Element(tagName)
}

function createElementNS (namespace, tagName) {
  return new renderer.Element(namespace + ':' + tagName)
}

function createTextNode (text) {
  return new renderer.TextNode(text)
}

function createComment (text) {
  return new renderer.Comment(text)
}

function insertBefore (node, target, before) {
  if (target.nodeType === 3) {
    if (node.type === 'text') {
      node.setAttr('value', target.text);
      target.parentNode = node;
    } else {
      var text = createElement$1('text');
      text.setAttr('value', target.text);
      node.insertBefore(text, before);
    }
    return
  }
  node.insertBefore(target, before);
}

function removeChild (node, child) {
  if (child.nodeType === 3) {
    node.setAttr('value', '');
    return
  }
  node.removeChild(child);
}

function appendChild (node, child) {
  if (child.nodeType === 3) {
    if (node.type === 'text') {
      node.setAttr('value', child.text);
      child.parentNode = node;
    } else {
      var text = createElement$1('text');
      text.setAttr('value', child.text);
      node.appendChild(text);
    }
    return
  }

  node.appendChild(child);
}

function parentNode (node) {
  return node.parentNode
}

function nextSibling (node) {
  return node.nextSibling
}

function tagName (node) {
  return node.type
}

function setTextContent (node, text) {
  node.parentNode.setAttr('value', text);
}

function setAttribute (node, key, val) {
  node.setAttr(key, val);
}


var nodeOps = Object.freeze({
	namespaceMap: namespaceMap,
	createElement: createElement$1,
	createElementNS: createElementNS,
	createTextNode: createTextNode,
	createComment: createComment,
	insertBefore: insertBefore,
	removeChild: removeChild,
	appendChild: appendChild,
	parentNode: parentNode,
	nextSibling: nextSibling,
	tagName: tagName,
	setTextContent: setTextContent,
	setAttribute: setAttribute
});

/*  */

var ref = {
  create: function create (_, vnode) {
    registerRef(vnode);
  },
  update: function update (oldVnode, vnode) {
    if (oldVnode.data.ref !== vnode.data.ref) {
      registerRef(oldVnode, true);
      registerRef(vnode);
    }
  },
  destroy: function destroy (vnode) {
    registerRef(vnode, true);
  }
};

function registerRef (vnode, isRemoval) {
  var key = vnode.data.ref;
  if (!key) { return }

  var vm = vnode.context;
  var ref = vnode.componentInstance || vnode.elm;
  var refs = vm.$refs;
  if (isRemoval) {
    if (Array.isArray(refs[key])) {
      remove(refs[key], ref);
    } else if (refs[key] === ref) {
      refs[key] = undefined;
    }
  } else {
    if (vnode.data.refInFor) {
      if (Array.isArray(refs[key]) && refs[key].indexOf(ref) < 0) {
        refs[key].push(ref);
      } else {
        refs[key] = [ref];
      }
    } else {
      refs[key] = ref;
    }
  }
}

/**
 * Virtual DOM patching algorithm based on Snabbdom by
 * Simon Friis Vindum (@paldepind)
 * Licensed under the MIT License
 * https://github.com/paldepind/snabbdom/blob/master/LICENSE
 *
 * modified by Evan You (@yyx990803)
 *

/*
 * Not type-checking this because this file is perf-critical and the cost
 * of making flow understand it is not worth it.
 */

var emptyNode = new VNode('', {}, []);

var hooks$1 = ['create', 'activate', 'update', 'remove', 'destroy'];

function isUndef (s) {
  return s == null
}

function isDef (s) {
  return s != null
}

function sameVnode (vnode1, vnode2) {
  return (
    vnode1.key === vnode2.key &&
    vnode1.tag === vnode2.tag &&
    vnode1.isComment === vnode2.isComment &&
    !vnode1.data === !vnode2.data
  )
}

function createKeyToOldIdx (children, beginIdx, endIdx) {
  var i, key;
  var map = {};
  for (i = beginIdx; i <= endIdx; ++i) {
    key = children[i].key;
    if (isDef(key)) { map[key] = i; }
  }
  return map
}

function createPatchFunction (backend) {
  var i, j;
  var cbs = {};

  var modules = backend.modules;
  var nodeOps = backend.nodeOps;

  for (i = 0; i < hooks$1.length; ++i) {
    cbs[hooks$1[i]] = [];
    for (j = 0; j < modules.length; ++j) {
      if (modules[j][hooks$1[i]] !== undefined) { cbs[hooks$1[i]].push(modules[j][hooks$1[i]]); }
    }
  }

  function emptyNodeAt (elm) {
    return new VNode(nodeOps.tagName(elm).toLowerCase(), {}, [], undefined, elm)
  }

  function createRmCb (childElm, listeners) {
    function remove$$1 () {
      if (--remove$$1.listeners === 0) {
        removeNode(childElm);
      }
    }
    remove$$1.listeners = listeners;
    return remove$$1
  }

  function removeNode (el) {
    var parent = nodeOps.parentNode(el);
    // element may have already been removed due to v-html / v-text
    if (parent) {
      nodeOps.removeChild(parent, el);
    }
  }

  var inPre = 0;
  function createElm (vnode, insertedVnodeQueue, parentElm, refElm, nested) {
    vnode.isRootInsert = !nested; // for transition enter check
    if (createComponent(vnode, insertedVnodeQueue, parentElm, refElm)) {
      return
    }

    var data = vnode.data;
    var children = vnode.children;
    var tag = vnode.tag;
    if (isDef(tag)) {
      if (process.env.NODE_ENV !== 'production') {
        if (data && data.pre) {
          inPre++;
        }
        if (
          !inPre &&
          !vnode.ns &&
          !(config.ignoredElements.length && config.ignoredElements.indexOf(tag) > -1) &&
          config.isUnknownElement(tag)
        ) {
          warn(
            'Unknown custom element: <' + tag + '> - did you ' +
            'register the component correctly? For recursive components, ' +
            'make sure to provide the "name" option.',
            vnode.context
          );
        }
      }
      vnode.elm = vnode.ns
        ? nodeOps.createElementNS(vnode.ns, tag)
        : nodeOps.createElement(tag, vnode);
      setScope(vnode);

      /* istanbul ignore if */
      {
        // in Weex, the default insertion order is parent-first.
        // List items can be optimized to use children-first insertion
        // with append="tree".
        var appendAsTree = data && data.appendAsTree;
        if (!appendAsTree) {
          if (isDef(data)) {
            invokeCreateHooks(vnode, insertedVnodeQueue);
          }
          insert(parentElm, vnode.elm, refElm);
        }
        createChildren(vnode, children, insertedVnodeQueue);
        if (appendAsTree) {
          if (isDef(data)) {
            invokeCreateHooks(vnode, insertedVnodeQueue);
          }
          insert(parentElm, vnode.elm, refElm);
        }
      }

      if (process.env.NODE_ENV !== 'production' && data && data.pre) {
        inPre--;
      }
    } else if (vnode.isComment) {
      vnode.elm = nodeOps.createComment(vnode.text);
      insert(parentElm, vnode.elm, refElm);
    } else {
      vnode.elm = nodeOps.createTextNode(vnode.text);
      insert(parentElm, vnode.elm, refElm);
    }
  }

  function createComponent (vnode, insertedVnodeQueue, parentElm, refElm) {
    var i = vnode.data;
    if (isDef(i)) {
      var isReactivated = isDef(vnode.componentInstance) && i.keepAlive;
      if (isDef(i = i.hook) && isDef(i = i.init)) {
        i(vnode, false /* hydrating */, parentElm, refElm);
      }
      // after calling the init hook, if the vnode is a child component
      // it should've created a child instance and mounted it. the child
      // component also has set the placeholder vnode's elm.
      // in that case we can just return the element and be done.
      if (isDef(vnode.componentInstance)) {
        initComponent(vnode, insertedVnodeQueue);
        if (isReactivated) {
          reactivateComponent(vnode, insertedVnodeQueue, parentElm, refElm);
        }
        return true
      }
    }
  }

  function initComponent (vnode, insertedVnodeQueue) {
    if (vnode.data.pendingInsert) {
      insertedVnodeQueue.push.apply(insertedVnodeQueue, vnode.data.pendingInsert);
    }
    vnode.elm = vnode.componentInstance.$el;
    if (isPatchable(vnode)) {
      invokeCreateHooks(vnode, insertedVnodeQueue);
      setScope(vnode);
    } else {
      // empty component root.
      // skip all element-related modules except for ref (#3455)
      registerRef(vnode);
      // make sure to invoke the insert hook
      insertedVnodeQueue.push(vnode);
    }
  }

  function reactivateComponent (vnode, insertedVnodeQueue, parentElm, refElm) {
    var i;
    // hack for #4339: a reactivated component with inner transition
    // does not trigger because the inner node's created hooks are not called
    // again. It's not ideal to involve module-specific logic in here but
    // there doesn't seem to be a better way to do it.
    var innerNode = vnode;
    while (innerNode.componentInstance) {
      innerNode = innerNode.componentInstance._vnode;
      if (isDef(i = innerNode.data) && isDef(i = i.transition)) {
        for (i = 0; i < cbs.activate.length; ++i) {
          cbs.activate[i](emptyNode, innerNode);
        }
        insertedVnodeQueue.push(innerNode);
        break
      }
    }
    // unlike a newly created component,
    // a reactivated keep-alive component doesn't insert itself
    insert(parentElm, vnode.elm, refElm);
  }

  function insert (parent, elm, ref) {
    if (parent) {
      if (ref) {
        nodeOps.insertBefore(parent, elm, ref);
      } else {
        nodeOps.appendChild(parent, elm);
      }
    }
  }

  function createChildren (vnode, children, insertedVnodeQueue) {
    if (Array.isArray(children)) {
      for (var i = 0; i < children.length; ++i) {
        createElm(children[i], insertedVnodeQueue, vnode.elm, null, true);
      }
    } else if (isPrimitive(vnode.text)) {
      nodeOps.appendChild(vnode.elm, nodeOps.createTextNode(vnode.text));
    }
  }

  function isPatchable (vnode) {
    while (vnode.componentInstance) {
      vnode = vnode.componentInstance._vnode;
    }
    return isDef(vnode.tag)
  }

  function invokeCreateHooks (vnode, insertedVnodeQueue) {
    for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {
      cbs.create[i$1](emptyNode, vnode);
    }
    i = vnode.data.hook; // Reuse variable
    if (isDef(i)) {
      if (i.create) { i.create(emptyNode, vnode); }
      if (i.insert) { insertedVnodeQueue.push(vnode); }
    }
  }

  // set scope id attribute for scoped CSS.
  // this is implemented as a special case to avoid the overhead
  // of going through the normal attribute patching process.
  function setScope (vnode) {
    var i;
    if (isDef(i = vnode.context) && isDef(i = i.$options._scopeId)) {
      nodeOps.setAttribute(vnode.elm, i, '');
    }
    if (isDef(i = activeInstance) &&
        i !== vnode.context &&
        isDef(i = i.$options._scopeId)) {
      nodeOps.setAttribute(vnode.elm, i, '');
    }
  }

  function addVnodes (parentElm, refElm, vnodes, startIdx, endIdx, insertedVnodeQueue) {
    for (; startIdx <= endIdx; ++startIdx) {
      createElm(vnodes[startIdx], insertedVnodeQueue, parentElm, refElm);
    }
  }

  function invokeDestroyHook (vnode) {
    var i, j;
    var data = vnode.data;
    if (isDef(data)) {
      if (isDef(i = data.hook) && isDef(i = i.destroy)) { i(vnode); }
      for (i = 0; i < cbs.destroy.length; ++i) { cbs.destroy[i](vnode); }
    }
    if (isDef(i = vnode.children)) {
      for (j = 0; j < vnode.children.length; ++j) {
        invokeDestroyHook(vnode.children[j]);
      }
    }
  }

  function removeVnodes (parentElm, vnodes, startIdx, endIdx) {
    for (; startIdx <= endIdx; ++startIdx) {
      var ch = vnodes[startIdx];
      if (isDef(ch)) {
        if (isDef(ch.tag)) {
          removeAndInvokeRemoveHook(ch);
          invokeDestroyHook(ch);
        } else { // Text node
          removeNode(ch.elm);
        }
      }
    }
  }

  function removeAndInvokeRemoveHook (vnode, rm) {
    if (rm || isDef(vnode.data)) {
      var listeners = cbs.remove.length + 1;
      if (!rm) {
        // directly removing
        rm = createRmCb(vnode.elm, listeners);
      } else {
        // we have a recursively passed down rm callback
        // increase the listeners count
        rm.listeners += listeners;
      }
      // recursively invoke hooks on child component root node
      if (isDef(i = vnode.componentInstance) && isDef(i = i._vnode) && isDef(i.data)) {
        removeAndInvokeRemoveHook(i, rm);
      }
      for (i = 0; i < cbs.remove.length; ++i) {
        cbs.remove[i](vnode, rm);
      }
      if (isDef(i = vnode.data.hook) && isDef(i = i.remove)) {
        i(vnode, rm);
      } else {
        rm();
      }
    } else {
      removeNode(vnode.elm);
    }
  }

  function updateChildren (parentElm, oldCh, newCh, insertedVnodeQueue, removeOnly) {
    var oldStartIdx = 0;
    var newStartIdx = 0;
    var oldEndIdx = oldCh.length - 1;
    var oldStartVnode = oldCh[0];
    var oldEndVnode = oldCh[oldEndIdx];
    var newEndIdx = newCh.length - 1;
    var newStartVnode = newCh[0];
    var newEndVnode = newCh[newEndIdx];
    var oldKeyToIdx, idxInOld, elmToMove, refElm;

    // removeOnly is a special flag used only by <transition-group>
    // to ensure removed elements stay in correct relative positions
    // during leaving transitions
    var canMove = !removeOnly;

    while (oldStartIdx <= oldEndIdx && newStartIdx <= newEndIdx) {
      if (isUndef(oldStartVnode)) {
        oldStartVnode = oldCh[++oldStartIdx]; // Vnode has been moved left
      } else if (isUndef(oldEndVnode)) {
        oldEndVnode = oldCh[--oldEndIdx];
      } else if (sameVnode(oldStartVnode, newStartVnode)) {
        patchVnode(oldStartVnode, newStartVnode, insertedVnodeQueue);
        oldStartVnode = oldCh[++oldStartIdx];
        newStartVnode = newCh[++newStartIdx];
      } else if (sameVnode(oldEndVnode, newEndVnode)) {
        patchVnode(oldEndVnode, newEndVnode, insertedVnodeQueue);
        oldEndVnode = oldCh[--oldEndIdx];
        newEndVnode = newCh[--newEndIdx];
      } else if (sameVnode(oldStartVnode, newEndVnode)) { // Vnode moved right
        patchVnode(oldStartVnode, newEndVnode, insertedVnodeQueue);
        canMove && nodeOps.insertBefore(parentElm, oldStartVnode.elm, nodeOps.nextSibling(oldEndVnode.elm));
        oldStartVnode = oldCh[++oldStartIdx];
        newEndVnode = newCh[--newEndIdx];
      } else if (sameVnode(oldEndVnode, newStartVnode)) { // Vnode moved left
        patchVnode(oldEndVnode, newStartVnode, insertedVnodeQueue);
        canMove && nodeOps.insertBefore(parentElm, oldEndVnode.elm, oldStartVnode.elm);
        oldEndVnode = oldCh[--oldEndIdx];
        newStartVnode = newCh[++newStartIdx];
      } else {
        if (isUndef(oldKeyToIdx)) { oldKeyToIdx = createKeyToOldIdx(oldCh, oldStartIdx, oldEndIdx); }
        idxInOld = isDef(newStartVnode.key) ? oldKeyToIdx[newStartVnode.key] : null;
        if (isUndef(idxInOld)) { // New element
          createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm);
          newStartVnode = newCh[++newStartIdx];
        } else {
          elmToMove = oldCh[idxInOld];
          /* istanbul ignore if */
          if (process.env.NODE_ENV !== 'production' && !elmToMove) {
            warn(
              'It seems there are duplicate keys that is causing an update error. ' +
              'Make sure each v-for item has a unique key.'
            );
          }
          if (sameVnode(elmToMove, newStartVnode)) {
            patchVnode(elmToMove, newStartVnode, insertedVnodeQueue);
            oldCh[idxInOld] = undefined;
            canMove && nodeOps.insertBefore(parentElm, newStartVnode.elm, oldStartVnode.elm);
            newStartVnode = newCh[++newStartIdx];
          } else {
            // same key but different element. treat as new element
            createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm);
            newStartVnode = newCh[++newStartIdx];
          }
        }
      }
    }
    if (oldStartIdx > oldEndIdx) {
      refElm = isUndef(newCh[newEndIdx + 1]) ? null : newCh[newEndIdx + 1].elm;
      addVnodes(parentElm, refElm, newCh, newStartIdx, newEndIdx, insertedVnodeQueue);
    } else if (newStartIdx > newEndIdx) {
      removeVnodes(parentElm, oldCh, oldStartIdx, oldEndIdx);
    }
  }

  function patchVnode (oldVnode, vnode, insertedVnodeQueue, removeOnly) {
    if (oldVnode === vnode) {
      return
    }
    // reuse element for static trees.
    // note we only do this if the vnode is cloned -
    // if the new node is not cloned it means the render functions have been
    // reset by the hot-reload-api and we need to do a proper re-render.
    if (vnode.isStatic &&
        oldVnode.isStatic &&
        vnode.key === oldVnode.key &&
        (vnode.isCloned || vnode.isOnce)) {
      vnode.elm = oldVnode.elm;
      vnode.componentInstance = oldVnode.componentInstance;
      return
    }
    var i;
    var data = vnode.data;
    var hasData = isDef(data);
    if (hasData && isDef(i = data.hook) && isDef(i = i.prepatch)) {
      i(oldVnode, vnode);
    }
    var elm = vnode.elm = oldVnode.elm;
    var oldCh = oldVnode.children;
    var ch = vnode.children;
    if (hasData && isPatchable(vnode)) {
      for (i = 0; i < cbs.update.length; ++i) { cbs.update[i](oldVnode, vnode); }
      if (isDef(i = data.hook) && isDef(i = i.update)) { i(oldVnode, vnode); }
    }
    if (isUndef(vnode.text)) {
      if (isDef(oldCh) && isDef(ch)) {
        if (oldCh !== ch) { updateChildren(elm, oldCh, ch, insertedVnodeQueue, removeOnly); }
      } else if (isDef(ch)) {
        if (isDef(oldVnode.text)) { nodeOps.setTextContent(elm, ''); }
        addVnodes(elm, null, ch, 0, ch.length - 1, insertedVnodeQueue);
      } else if (isDef(oldCh)) {
        removeVnodes(elm, oldCh, 0, oldCh.length - 1);
      } else if (isDef(oldVnode.text)) {
        nodeOps.setTextContent(elm, '');
      }
    } else if (oldVnode.text !== vnode.text) {
      nodeOps.setTextContent(elm, vnode.text);
    }
    if (hasData) {
      if (isDef(i = data.hook) && isDef(i = i.postpatch)) { i(oldVnode, vnode); }
    }
  }

  function invokeInsertHook (vnode, queue, initial) {
    // delay insert hooks for component root nodes, invoke them after the
    // element is really inserted
    if (initial && vnode.parent) {
      vnode.parent.data.pendingInsert = queue;
    } else {
      for (var i = 0; i < queue.length; ++i) {
        queue[i].data.hook.insert(queue[i]);
      }
    }
  }

  var bailed = false;
  // list of modules that can skip create hook during hydration because they
  // are already rendered on the client or has no need for initialization
  var isRenderedModule = makeMap('attrs,style,class,staticClass,staticStyle,key');

  // Note: this is a browser-only function so we can assume elms are DOM nodes.
  function hydrate (elm, vnode, insertedVnodeQueue) {
    if (process.env.NODE_ENV !== 'production') {
      if (!assertNodeMatch(elm, vnode)) {
        return false
      }
    }
    vnode.elm = elm;
    var tag = vnode.tag;
    var data = vnode.data;
    var children = vnode.children;
    if (isDef(data)) {
      if (isDef(i = data.hook) && isDef(i = i.init)) { i(vnode, true /* hydrating */); }
      if (isDef(i = vnode.componentInstance)) {
        // child component. it should have hydrated its own tree.
        initComponent(vnode, insertedVnodeQueue);
        return true
      }
    }
    if (isDef(tag)) {
      if (isDef(children)) {
        // empty element, allow client to pick up and populate children
        if (!elm.hasChildNodes()) {
          createChildren(vnode, children, insertedVnodeQueue);
        } else {
          var childrenMatch = true;
          var childNode = elm.firstChild;
          for (var i$1 = 0; i$1 < children.length; i$1++) {
            if (!childNode || !hydrate(childNode, children[i$1], insertedVnodeQueue)) {
              childrenMatch = false;
              break
            }
            childNode = childNode.nextSibling;
          }
          // if childNode is not null, it means the actual childNodes list is
          // longer than the virtual children list.
          if (!childrenMatch || childNode) {
            if (process.env.NODE_ENV !== 'production' &&
                typeof console !== 'undefined' &&
                !bailed) {
              bailed = true;
              console.warn('Parent: ', elm);
              console.warn('Mismatching childNodes vs. VNodes: ', elm.childNodes, children);
            }
            return false
          }
        }
      }
      if (isDef(data)) {
        for (var key in data) {
          if (!isRenderedModule(key)) {
            invokeCreateHooks(vnode, insertedVnodeQueue);
            break
          }
        }
      }
    } else if (elm.data !== vnode.text) {
      elm.data = vnode.text;
    }
    return true
  }

  function assertNodeMatch (node, vnode) {
    if (vnode.tag) {
      return (
        vnode.tag.indexOf('vue-component') === 0 ||
        vnode.tag.toLowerCase() === (node.tagName && node.tagName.toLowerCase())
      )
    } else {
      return node.nodeType === (vnode.isComment ? 8 : 3)
    }
  }

  return function patch (oldVnode, vnode, hydrating, removeOnly, parentElm, refElm) {
    if (!vnode) {
      if (oldVnode) { invokeDestroyHook(oldVnode); }
      return
    }

    var isInitialPatch = false;
    var insertedVnodeQueue = [];

    if (!oldVnode) {
      // empty mount (likely as component), create new root element
      isInitialPatch = true;
      createElm(vnode, insertedVnodeQueue, parentElm, refElm);
    } else {
      var isRealElement = isDef(oldVnode.nodeType);
      if (!isRealElement && sameVnode(oldVnode, vnode)) {
        // patch existing root node
        patchVnode(oldVnode, vnode, insertedVnodeQueue, removeOnly);
      } else {
        if (isRealElement) {
          // mounting to a real element
          // check if this is server-rendered content and if we can perform
          // a successful hydration.
          if (oldVnode.nodeType === 1 && oldVnode.hasAttribute('server-rendered')) {
            oldVnode.removeAttribute('server-rendered');
            hydrating = true;
          }
          if (hydrating) {
            if (hydrate(oldVnode, vnode, insertedVnodeQueue)) {
              invokeInsertHook(vnode, insertedVnodeQueue, true);
              return oldVnode
            } else if (process.env.NODE_ENV !== 'production') {
              warn(
                'The client-side rendered virtual DOM tree is not matching ' +
                'server-rendered content. This is likely caused by incorrect ' +
                'HTML markup, for example nesting block-level elements inside ' +
                '<p>, or missing <tbody>. Bailing hydration and performing ' +
                'full client-side render.'
              );
            }
          }
          // either not server-rendered, or hydration failed.
          // create an empty node and replace it
          oldVnode = emptyNodeAt(oldVnode);
        }
        // replacing existing element
        var oldElm = oldVnode.elm;
        var parentElm$1 = nodeOps.parentNode(oldElm);
        createElm(
          vnode,
          insertedVnodeQueue,
          // extremely rare edge case: do not insert if old element is in a
          // leaving transition. Only happens when combining transition +
          // keep-alive + HOCs. (#4590)
          oldElm._leaveCb ? null : parentElm$1,
          nodeOps.nextSibling(oldElm)
        );

        if (vnode.parent) {
          // component root element replaced.
          // update parent placeholder node element, recursively
          var ancestor = vnode.parent;
          while (ancestor) {
            ancestor.elm = vnode.elm;
            ancestor = ancestor.parent;
          }
          if (isPatchable(vnode)) {
            for (var i = 0; i < cbs.create.length; ++i) {
              cbs.create[i](emptyNode, vnode.parent);
            }
          }
        }

        if (parentElm$1 !== null) {
          removeVnodes(parentElm$1, [oldVnode], 0, 0);
        } else if (isDef(oldVnode.tag)) {
          invokeDestroyHook(oldVnode);
        }
      }
    }

    invokeInsertHook(vnode, insertedVnodeQueue, isInitialPatch);
    return vnode.elm
  }
}

/*  */

var directives = {
  create: updateDirectives,
  update: updateDirectives,
  destroy: function unbindDirectives (vnode) {
    updateDirectives(vnode, emptyNode);
  }
};

function updateDirectives (oldVnode, vnode) {
  if (oldVnode.data.directives || vnode.data.directives) {
    _update(oldVnode, vnode);
  }
}

function _update (oldVnode, vnode) {
  var isCreate = oldVnode === emptyNode;
  var isDestroy = vnode === emptyNode;
  var oldDirs = normalizeDirectives$1(oldVnode.data.directives, oldVnode.context);
  var newDirs = normalizeDirectives$1(vnode.data.directives, vnode.context);

  var dirsWithInsert = [];
  var dirsWithPostpatch = [];

  var key, oldDir, dir;
  for (key in newDirs) {
    oldDir = oldDirs[key];
    dir = newDirs[key];
    if (!oldDir) {
      // new directive, bind
      callHook$1(dir, 'bind', vnode, oldVnode);
      if (dir.def && dir.def.inserted) {
        dirsWithInsert.push(dir);
      }
    } else {
      // existing directive, update
      dir.oldValue = oldDir.value;
      callHook$1(dir, 'update', vnode, oldVnode);
      if (dir.def && dir.def.componentUpdated) {
        dirsWithPostpatch.push(dir);
      }
    }
  }

  if (dirsWithInsert.length) {
    var callInsert = function () {
      for (var i = 0; i < dirsWithInsert.length; i++) {
        callHook$1(dirsWithInsert[i], 'inserted', vnode, oldVnode);
      }
    };
    if (isCreate) {
      mergeVNodeHook(vnode.data.hook || (vnode.data.hook = {}), 'insert', callInsert, 'dir-insert');
    } else {
      callInsert();
    }
  }

  if (dirsWithPostpatch.length) {
    mergeVNodeHook(vnode.data.hook || (vnode.data.hook = {}), 'postpatch', function () {
      for (var i = 0; i < dirsWithPostpatch.length; i++) {
        callHook$1(dirsWithPostpatch[i], 'componentUpdated', vnode, oldVnode);
      }
    }, 'dir-postpatch');
  }

  if (!isCreate) {
    for (key in oldDirs) {
      if (!newDirs[key]) {
        // no longer present, unbind
        callHook$1(oldDirs[key], 'unbind', oldVnode, oldVnode, isDestroy);
      }
    }
  }
}

var emptyModifiers = Object.create(null);

function normalizeDirectives$1 (
  dirs,
  vm
) {
  var res = Object.create(null);
  if (!dirs) {
    return res
  }
  var i, dir;
  for (i = 0; i < dirs.length; i++) {
    dir = dirs[i];
    if (!dir.modifiers) {
      dir.modifiers = emptyModifiers;
    }
    res[getRawDirName(dir)] = dir;
    dir.def = resolveAsset(vm.$options, 'directives', dir.name, true);
  }
  return res
}

function getRawDirName (dir) {
  return dir.rawName || ((dir.name) + "." + (Object.keys(dir.modifiers || {}).join('.')))
}

function callHook$1 (dir, hook, vnode, oldVnode, isDestroy) {
  var fn = dir.def && dir.def[hook];
  if (fn) {
    fn(vnode.elm, dir, vnode, oldVnode, isDestroy);
  }
}

var baseModules = [
  ref,
  directives
];

/*  */

function updateAttrs (oldVnode, vnode) {
  if (!oldVnode.data.attrs && !vnode.data.attrs) {
    return
  }
  var key, cur, old;
  var elm = vnode.elm;
  var oldAttrs = oldVnode.data.attrs || {};
  var attrs = vnode.data.attrs || {};
  // clone observed objects, as the user probably wants to mutate it
  if (attrs.__ob__) {
    attrs = vnode.data.attrs = extend({}, attrs);
  }

  for (key in attrs) {
    cur = attrs[key];
    old = oldAttrs[key];
    if (old !== cur) {
      elm.setAttr(key, cur);
    }
  }
  for (key in oldAttrs) {
    if (attrs[key] == null) {
      elm.setAttr(key);
    }
  }
}

var attrs = {
  create: updateAttrs,
  update: updateAttrs
};

/*  */

function updateClass (oldVnode, vnode) {
  var el = vnode.elm;
  var ctx = vnode.context;

  var data = vnode.data;
  var oldData = oldVnode.data;
  if (!data.staticClass && !data.class &&
      (!oldData || (!oldData.staticClass && !oldData.class))) {
    return
  }

  var oldClassList = [];
  // unlike web, weex vnode staticClass is an Array
  var oldStaticClass = oldData.staticClass;
  if (oldStaticClass) {
    oldClassList.push.apply(oldClassList, oldStaticClass);
  }
  if (oldData.class) {
    oldClassList.push.apply(oldClassList, oldData.class);
  }

  var classList = [];
  // unlike web, weex vnode staticClass is an Array
  var staticClass = data.staticClass;
  if (staticClass) {
    classList.push.apply(classList, staticClass);
  }
  if (data.class) {
    classList.push.apply(classList, data.class);
  }

  var style = getStyle(oldClassList, classList, ctx);
  for (var key in style) {
    el.setStyle(key, style[key]);
  }
}

function getStyle (oldClassList, classList, ctx) {
  // style is a weex-only injected object
  // compiled from <style> tags in weex files
  var stylesheet = ctx.$options.style || {};
  var result = {};
  classList.forEach(function (name) {
    var style = stylesheet[name];
    extend(result, style);
  });
  oldClassList.forEach(function (name) {
    var style = stylesheet[name];
    for (var key in style) {
      if (!result.hasOwnProperty(key)) {
        result[key] = '';
      }
    }
  });
  return result
}

var klass = {
  create: updateClass,
  update: updateClass
};

/*  */

function updateDOMListeners (oldVnode, vnode) {
  if (!oldVnode.data.on && !vnode.data.on) {
    return
  }
  var on = vnode.data.on || {};
  var oldOn = oldVnode.data.on || {};
  updateListeners(on, oldOn, function (event, handler, capture) {
    if (capture) {
      console.log('Weex do not support event in bubble phase.');
      return
    }
    vnode.elm.addEvent(event, handler.bind(vnode.context));
  }, function (event) {
    vnode.elm.removeEvent(event);
  }, vnode.context);
}

var events = {
  create: updateDOMListeners,
  update: updateDOMListeners
};

/*  */

var normalize$1 = cached(camelize);

function createStyle (oldVnode, vnode) {
  if (!vnode.data.staticStyle) {
    updateStyle(oldVnode, vnode);
    return
  }
  var elm = vnode.elm;
  var staticStyle = vnode.data.staticStyle;
  for (var name in staticStyle) {
    if (staticStyle[name]) {
      elm.setStyle(normalize$1(name), staticStyle[name]);
    }
  }
  updateStyle(oldVnode, vnode);
}

function updateStyle (oldVnode, vnode) {
  if (!oldVnode.data.style && !vnode.data.style) {
    return
  }
  var cur, name;
  var elm = vnode.elm;
  var oldStyle = oldVnode.data.style || {};
  var style = vnode.data.style || {};

  var needClone = style.__ob__;

  // handle array syntax
  if (Array.isArray(style)) {
    style = vnode.data.style = toObject$1(style);
  }

  // clone the style for future updates,
  // in case the user mutates the style object in-place.
  if (needClone) {
    style = vnode.data.style = extend({}, style);
  }

  for (name in oldStyle) {
    if (!style[name]) {
      elm.setStyle(normalize$1(name), '');
    }
  }
  for (name in style) {
    cur = style[name];
    elm.setStyle(normalize$1(name), cur);
  }
}

function toObject$1 (arr) {
  var res = {};
  for (var i = 0; i < arr.length; i++) {
    if (arr[i]) {
      extend(res, arr[i]);
    }
  }
  return res
}

var style = {
  create: createStyle,
  update: updateStyle
};

var platformModules = [
  attrs,
  klass,
  events,
  style
];

/*  */

// the directive module should be applied last, after all
// built-in modules have been applied.
var modules$1 = platformModules.concat(baseModules);

var patch$1 = createPatchFunction({
  nodeOps: nodeOps,
  modules: modules$1,
  LONG_LIST_THRESHOLD: 10
});

var platformDirectives = {
};

var isReservedTag = makeMap(
  'div,img,image,input,switch,indicator,list,scroller,cell,template,text,slider,image'
);

function mustUseProp () { /* console.log('mustUseProp') */ }

function isUnknownElement () { /* console.log('isUnknownElement') */ }
function query (el, document) {
  var placeholder = new renderer.Comment('root');
  placeholder.hasAttribute = placeholder.removeAttribute = function () {}; // hack for patch
  document.documentElement.appendChild(placeholder);
  return placeholder
}

/*  */

// install platform specific utils
Vue$2.config.isUnknownElement = isUnknownElement;
Vue$2.config.isReservedTag = isReservedTag;
Vue$2.config.mustUseProp = mustUseProp;

// install platform runtime directives
Vue$2.options.directives = platformDirectives;

// install platform patch function
Vue$2.prototype.__patch__ = patch$1;

// wrap mount
Vue$2.prototype.$mount = function (
  el,
  hydrating
) {
  return this._mount(el && query(el, this.$document), hydrating)
};

Vue$2.weexVersion = '2.1.9-weex.1';
var instances = renderer.instances;
var modules = renderer.modules;
var components = renderer.components;

var activeId;
var oriIsReservedTag = (Vue$2 && Vue$2.config && typeof Vue$2.config.isReservedTag === 'function') ? Vue$2.config.isReservedTag : function () {};

/**
 * Prepare framework config, basically about the virtual-DOM and JS bridge.
 * @param {object} cfg
 */
function init (cfg) {
  renderer.Document = cfg.Document;
  renderer.Element = cfg.Element;
  renderer.Comment = cfg.Comment;
  renderer.sendTasks = cfg.sendTasks;
}

/**
 * Reset framework config and clear all registrations.
 */
function reset () {
  clear$1(instances);
  clear$1(modules);
  clear$1(components);
  delete renderer.Document;
  delete renderer.Element;
  delete renderer.Comment;
  delete renderer.sendTasks;
  Vue$2.config.isReservedTag = oriIsReservedTag;
}

/**
 * Delete all keys of an object.
 * @param {object} obj
 */
function clear$1 (obj) {
  for (var key in obj) {
    delete obj[key];
  }
}

/**
 * Create an instance with id, code, config and external data.
 * @param {string} instanceId
 * @param {string} appCode
 * @param {object} config
 * @param {object} data
 * @param {object} env { info, config, services }
 */
function createInstance (
  instanceId,
  appCode,
  config,
  data,
  env
) {
  if ( appCode === void 0 ) appCode = '';
  if ( config === void 0 ) config = {};
  if ( env === void 0 ) env = {};

  // Set active instance id and put some information into `instances` map.
  activeId = instanceId;

  // Virtual-DOM object.
  var document = new renderer.Document(instanceId, config.bundleUrl);

  // All function/callback of parameters before sent to native
  // will be converted as an id. So `callbacks` is used to store
  // these real functions. When a callback invoked and won't be
  // called again, it should be removed from here automatically.
  var callbacks = [];

  // The latest callback id, incremental.
  var callbackId = 1;

  instances[instanceId] = {
    instanceId: instanceId, config: config, data: data,
    document: document, callbacks: callbacks, callbackId: callbackId
  };

  // Prepare native module getter and HTML5 Timer APIs.
  var moduleGetter = genModuleGetter(instanceId);
  var timerAPIs = getInstanceTimer(instanceId, moduleGetter);

  // Prepare `weex` instance variable.
  var weexInstanceVar = {
    config: config,
    document: document,
    requireModule: moduleGetter
  };
  Object.freeze(weexInstanceVar);

  // Each instance has a independent `Vue` variable and it should have
  // all top-level public APIs.
  var subVue = Vue$2.extend({});

  // ensure plain-object components are extended from the subVue
  subVue.options._base = subVue

  // expose global utility
  ;['util', 'set', 'delete', 'nextTick', 'version', 'weexVersion', 'config'].forEach(function (name) {
    subVue[name] = Vue$2[name];
  });

  // The function which create a closure the JS Bundle will run in.
  // It will declare some instance variables like `Vue`, HTML5 Timer APIs etc.
  var instanceVars = Object.assign({
    Vue: subVue,
    weex: weexInstanceVar,
    __weex_require_module__: weexInstanceVar.requireModule // deprecated
  }, timerAPIs);
  callFunction(instanceVars, appCode);

  // Send `createFinish` signal to native.
  renderer.sendTasks(instanceId + '', [{ module: 'dom', method: 'createFinish', args: [] }], -1);
}

/**
 * Destroy an instance with id. It will make sure all memory of
 * this instance released and no more leaks.
 * @param {string} instanceId
 */
function destroyInstance (instanceId) {
  var instance = instances[instanceId] || {};
  if (instance.app instanceof Vue$2) {
    instance.app.$destroy();
  }
  delete instances[instanceId];
}

/**
 * Refresh an instance with id and new top-level component data.
 * It will use `Vue.set` on all keys of the new data. So it's better
 * define all possible meaningful keys when instance created.
 * @param {string} instanceId
 * @param {object} data
 */
function refreshInstance (instanceId, data) {
  var instance = instances[instanceId] || {};
  if (!(instance.app instanceof Vue$2)) {
    return new Error(("refreshInstance: instance " + instanceId + " not found!"))
  }
  for (var key in data) {
    Vue$2.set(instance.app, key, data[key]);
  }
  // Finally `refreshFinish` signal needed.
  renderer.sendTasks(instanceId + '', [{ module: 'dom', method: 'refreshFinish', args: [] }], -1);
}

/**
 * Get the JSON object of the root element.
 * @param {string} instanceId
 */
function getRoot (instanceId) {
  var instance = instances[instanceId] || {};
  if (!(instance.app instanceof Vue$2)) {
    return new Error(("getRoot: instance " + instanceId + " not found!"))
  }
  return instance.app.$el.toJSON()
}

/**
 * Receive tasks from native. Generally there are two types of tasks:
 * 1. `fireEvent`: an device actions or user actions from native.
 * 2. `callback`: invoke function which sent to native as a parameter before.
 * @param {string} instanceId
 * @param {array}  tasks
 */
function receiveTasks (instanceId, tasks) {
  var instance = instances[instanceId] || {};
  if (!(instance.app instanceof Vue$2)) {
    return new Error(("receiveTasks: instance " + instanceId + " not found!"))
  }
  var callbacks = instance.callbacks;
  var document = instance.document;
  tasks.forEach(function (task) {
    // `fireEvent` case: find the event target and fire.
    if (task.method === 'fireEvent') {
      var ref = task.args;
      var nodeId = ref[0];
      var type = ref[1];
      var e = ref[2];
      var domChanges = ref[3];
      var el = document.getRef(nodeId);
      document.fireEvent(el, type, e, domChanges);
    }
    // `callback` case: find the callback by id and call it.
    if (task.method === 'callback') {
      var ref$1 = task.args;
      var callbackId = ref$1[0];
      var data = ref$1[1];
      var ifKeepAlive = ref$1[2];
      var callback = callbacks[callbackId];
      if (typeof callback === 'function') {
        callback(data);
        // Remove the callback from `callbacks` if it won't called again.
        if (typeof ifKeepAlive === 'undefined' || ifKeepAlive === false) {
          callbacks[callbackId] = undefined;
        }
      }
    }
  });
  // Finally `updateFinish` signal needed.
  renderer.sendTasks(instanceId + '', [{ module: 'dom', method: 'updateFinish', args: [] }], -1);
}

/**
 * Register native modules information.
 * @param {object} newModules
 */
function registerModules (newModules) {
  var loop = function ( name ) {
    if (!modules[name]) {
      modules[name] = {};
    }
    newModules[name].forEach(function (method) {
      if (typeof method === 'string') {
        modules[name][method] = true;
      } else {
        modules[name][method.name] = method.args;
      }
    });
  };

  for (var name in newModules) loop( name );
}

/**
 * Register native components information.
 * @param {array} newComponents
 */
function registerComponents (newComponents) {
  var config = Vue$2.config;
  var newConfig = {};
  if (Array.isArray(newComponents)) {
    newComponents.forEach(function (component) {
      if (!component) {
        return
      }
      if (typeof component === 'string') {
        components[component] = true;
        newConfig[component] = true;
      } else if (typeof component === 'object' && typeof component.type === 'string') {
        components[component.type] = component;
        newConfig[component.type] = true;
      }
    });
    var oldIsReservedTag = config.isReservedTag;
    config.isReservedTag = function (name) {
      return newConfig[name] || oldIsReservedTag(name)
    };
  }
}

// Hack `Vue` behavior to handle instance information and data
// before root component created.
Vue$2.mixin({
  beforeCreate: function beforeCreate () {
    var options = this.$options;
    var parentOptions = (options.parent && options.parent.$options) || {};

    // root component (vm)
    if (options.el) {
      // record instance info
      var instance = instances[activeId] || {};
      this.$instanceId = activeId;
      options.instanceId = activeId;
      this.$document = instance.document;

      // set external data of instance
      var dataOption = options.data;
      var internalData = (typeof dataOption === 'function' ? dataOption() : dataOption) || {};
      options.data = Object.assign(internalData, instance.data);

      // record instance by id
      instance.app = this;

      activeId = undefined;
    } else {
      this.$instanceId = options.instanceId = parentOptions.instanceId;
    }
  }
});

/**
 * @deprecated Just instance variable `weex.config`
 * Get instance config.
 * @return {object}
 */
Vue$2.prototype.$getConfig = function () {
  var instance = instances[this.$instanceId] || {};
  if (instance.app instanceof Vue$2) {
    return instance.config
  }
};

/**
 * Generate native module getter. Each native module has several
 * methods to call. And all the hebaviors is instance-related. So
 * this getter will return a set of methods which additionally
 * send current instance id to native when called. Also the args
 * will be normalized into "safe" value. For example function arg
 * will be converted into a callback id.
 * @param  {string}  instanceId
 * @return {function}
 */
function genModuleGetter (instanceId) {
  var instance = instances[instanceId];
  return function (name) {
    var nativeModule = modules[name] || [];
    var output = {};
    var loop = function ( methodName ) {
      output[methodName] = function () {
        var args = [], len = arguments.length;
        while ( len-- ) args[ len ] = arguments[ len ];

        var finalArgs = args.map(function (value) {
          return normalize(value, instance)
        });
        renderer.sendTasks(instanceId + '', [{ module: name, method: methodName, args: finalArgs }], -1);
      };
    };

    for (var methodName in nativeModule) loop( methodName );
    return output
  }
}

/**
 * Generate HTML5 Timer APIs. An important point is that the callback
 * will be converted into callback id when sent to native. So the
 * framework can make sure no side effect of the callabck happened after
 * an instance destroyed.
 * @param  {[type]} instanceId   [description]
 * @param  {[type]} moduleGetter [description]
 * @return {[type]}              [description]
 */
function getInstanceTimer (instanceId, moduleGetter) {
  var instance = instances[instanceId];
  var timer = moduleGetter('timer');
  var timerAPIs = {
    setTimeout: function () {
      var args = [], len = arguments.length;
      while ( len-- ) args[ len ] = arguments[ len ];

      var handler = function () {
        args[0].apply(args, args.slice(2));
      };
      timer.setTimeout(handler, args[1]);
      return instance.callbackId.toString()
    },
    setInterval: function () {
      var args = [], len = arguments.length;
      while ( len-- ) args[ len ] = arguments[ len ];

      var handler = function () {
        args[0].apply(args, args.slice(2));
      };
      timer.setInterval(handler, args[1]);
      return instance.callbackId.toString()
    },
    clearTimeout: function (n) {
      timer.clearTimeout(n);
    },
    clearInterval: function (n) {
      timer.clearInterval(n);
    }
  };
  return timerAPIs
}

/**
 * Call a new function body with some global objects.
 * @param  {object} globalObjects
 * @param  {string} code
 * @return {any}
 */
function callFunction (globalObjects, body) {
  var globalKeys = [];
  var globalValues = [];
  for (var key in globalObjects) {
    globalKeys.push(key);
    globalValues.push(globalObjects[key]);
  }
  globalKeys.push(body);

  var result = new (Function.prototype.bind.apply( Function, [ null ].concat( globalKeys) ));
  return result.apply(void 0, globalValues)
}

/**
 * Convert all type of values into "safe" format to send to native.
 * 1. A `function` will be converted into callback id.
 * 2. An `Element` object will be converted into `ref`.
 * The `instance` param is used to generate callback id and store
 * function if necessary.
 * @param  {any}    v
 * @param  {object} instance
 * @return {any}
 */
function normalize (v, instance) {
  var type = typof(v);

  switch (type) {
    case 'undefined':
    case 'null':
      return ''
    case 'regexp':
      return v.toString()
    case 'date':
      return v.toISOString()
    case 'number':
    case 'string':
    case 'boolean':
    case 'array':
    case 'object':
      if (v instanceof renderer.Element) {
        return v.ref
      }
      return v
    case 'function':
      instance.callbacks[++instance.callbackId] = v;
      return instance.callbackId.toString()
    default:
      return JSON.stringify(v)
  }
}

/**
 * Get the exact type of an object by `toString()`. For example call
 * `toString()` on an array will be returned `[object Array]`.
 * @param  {any}    v
 * @return {string}
 */
function typof (v) {
  var s = Object.prototype.toString.call(v);
  return s.substring(8, s.length - 1).toLowerCase()
}

exports.Vue = Vue$2;
exports.init = init;
exports.reset = reset;
exports.createInstance = createInstance;
exports.destroyInstance = destroyInstance;
exports.refreshInstance = refreshInstance;
exports.getRoot = getRoot;
exports.receiveTasks = receiveTasks;
exports.registerModules = registerModules;
exports.registerComponents = registerComponents;