/files/vue/1.0.16/vue.js

/*!
 * Vue.js v1.0.16
 * (c) 2016 Evan You
 * Released under the MIT License.
 */
(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
  typeof define === 'function' && define.amd ? define(factory) :
  global.Vue = factory();
}(this, function () { 'use strict';

  function set(obj, key, val) {
    if (hasOwn(obj, key)) {
      obj[key] = val;
      return;
    }
    if (obj._isVue) {
      set(obj._data, key, val);
      return;
    }
    var ob = obj.__ob__;
    if (!ob) {
      obj[key] = val;
      return;
    }
    ob.convert(key, val);
    ob.dep.notify();
    if (ob.vms) {
      var i = ob.vms.length;
      while (i--) {
        var vm = ob.vms[i];
        vm._proxy(key);
        vm._digest();
      }
    }
    return val;
  }

  /**
   * Delete a property and trigger change if necessary.
   *
   * @param {Object} obj
   * @param {String} key
   */

  function del(obj, key) {
    if (!hasOwn(obj, key)) {
      return;
    }
    delete obj[key];
    var ob = obj.__ob__;
    if (!ob) {
      return;
    }
    ob.dep.notify();
    if (ob.vms) {
      var i = ob.vms.length;
      while (i--) {
        var vm = ob.vms[i];
        vm._unproxy(key);
        vm._digest();
      }
    }
  }

  var hasOwnProperty = Object.prototype.hasOwnProperty;
  /**
   * Check whether the object has the property.
   *
   * @param {Object} obj
   * @param {String} key
   * @return {Boolean}
   */

  function hasOwn(obj, key) {
    return hasOwnProperty.call(obj, key);
  }

  /**
   * Check if an expression is a literal value.
   *
   * @param {String} exp
   * @return {Boolean}
   */

  var literalValueRE = /^\s?(true|false|-?[\d\.]+|'[^']*'|"[^"]*")\s?$/;

  function isLiteral(exp) {
    return literalValueRE.test(exp);
  }

  /**
   * Check if a string starts with $ or _
   *
   * @param {String} str
   * @return {Boolean}
   */

  function isReserved(str) {
    var c = (str + '').charCodeAt(0);
    return c === 0x24 || c === 0x5F;
  }

  /**
   * Guard text output, make sure undefined outputs
   * empty string
   *
   * @param {*} value
   * @return {String}
   */

  function _toString(value) {
    return value == null ? '' : value.toString();
  }

  /**
   * Check and convert possible numeric strings to numbers
   * before setting back to data
   *
   * @param {*} value
   * @return {*|Number}
   */

  function toNumber(value) {
    if (typeof value !== 'string') {
      return value;
    } else {
      var parsed = Number(value);
      return isNaN(parsed) ? value : parsed;
    }
  }

  /**
   * Convert string boolean literals into real booleans.
   *
   * @param {*} value
   * @return {*|Boolean}
   */

  function toBoolean(value) {
    return value === 'true' ? true : value === 'false' ? false : value;
  }

  /**
   * Strip quotes from a string
   *
   * @param {String} str
   * @return {String | false}
   */

  function stripQuotes(str) {
    var a = str.charCodeAt(0);
    var b = str.charCodeAt(str.length - 1);
    return a === b && (a === 0x22 || a === 0x27) ? str.slice(1, -1) : str;
  }

  /**
   * Camelize a hyphen-delmited string.
   *
   * @param {String} str
   * @return {String}
   */

  var camelizeRE = /-(\w)/g;

  function camelize(str) {
    return str.replace(camelizeRE, toUpper);
  }

  function toUpper(_, c) {
    return c ? c.toUpperCase() : '';
  }

  /**
   * Hyphenate a camelCase string.
   *
   * @param {String} str
   * @return {String}
   */

  var hyphenateRE = /([a-z\d])([A-Z])/g;

  function hyphenate(str) {
    return str.replace(hyphenateRE, '$1-$2').toLowerCase();
  }

  /**
   * Converts hyphen/underscore/slash delimitered names into
   * camelized classNames.
   *
   * e.g. my-component => MyComponent
   *      some_else    => SomeElse
   *      some/comp    => SomeComp
   *
   * @param {String} str
   * @return {String}
   */

  var classifyRE = /(?:^|[-_\/])(\w)/g;

  function classify(str) {
    return str.replace(classifyRE, toUpper);
  }

  /**
   * Simple bind, faster than native
   *
   * @param {Function} fn
   * @param {Object} ctx
   * @return {Function}
   */

  function bind$1(fn, ctx) {
    return function (a) {
      var l = arguments.length;
      return l ? l > 1 ? fn.apply(ctx, arguments) : fn.call(ctx, a) : fn.call(ctx);
    };
  }

  /**
   * Convert an Array-like object to a real Array.
   *
   * @param {Array-like} list
   * @param {Number} [start] - start index
   * @return {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.
   *
   * @param {Object} to
   * @param {Object} from
   */

  function extend(to, from) {
    var keys = Object.keys(from);
    var i = keys.length;
    while (i--) {
      to[keys[i]] = from[keys[i]];
    }
    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.
   *
   * @param {*} obj
   * @return {Boolean}
   */

  function isObject(obj) {
    return obj !== null && typeof obj === 'object';
  }

  /**
   * Strict object type check. Only returns true
   * for plain JavaScript objects.
   *
   * @param {*} obj
   * @return {Boolean}
   */

  var toString = Object.prototype.toString;
  var OBJECT_STRING = '[object Object]';

  function isPlainObject(obj) {
    return toString.call(obj) === OBJECT_STRING;
  }

  /**
   * Array type check.
   *
   * @param {*} obj
   * @return {Boolean}
   */

  var isArray = Array.isArray;

  /**
   * Define a non-enumerable property
   *
   * @param {Object} obj
   * @param {String} key
   * @param {*} val
   * @param {Boolean} [enumerable]
   */

  function def(obj, key, val, enumerable) {
    Object.defineProperty(obj, key, {
      value: val,
      enumerable: !!enumerable,
      writable: true,
      configurable: true
    });
  }

  /**
   * Debounce a function so it only gets called after the
   * input stops arriving after the given wait period.
   *
   * @param {Function} func
   * @param {Number} wait
   * @return {Function} - the debounced function
   */

  function _debounce(func, wait) {
    var timeout, args, context, timestamp, result;
    var later = function later() {
      var last = Date.now() - timestamp;
      if (last < wait && last >= 0) {
        timeout = setTimeout(later, wait - last);
      } else {
        timeout = null;
        result = func.apply(context, args);
        if (!timeout) context = args = null;
      }
    };
    return function () {
      context = this;
      args = arguments;
      timestamp = Date.now();
      if (!timeout) {
        timeout = setTimeout(later, wait);
      }
      return result;
    };
  }

  /**
   * Manual indexOf because it's slightly faster than
   * native.
   *
   * @param {Array} arr
   * @param {*} obj
   */

  function indexOf(arr, obj) {
    var i = arr.length;
    while (i--) {
      if (arr[i] === obj) return i;
    }
    return -1;
  }

  /**
   * Make a cancellable version of an async callback.
   *
   * @param {Function} fn
   * @return {Function}
   */

  function cancellable(fn) {
    var cb = function cb() {
      if (!cb.cancelled) {
        return fn.apply(this, arguments);
      }
    };
    cb.cancel = function () {
      cb.cancelled = true;
    };
    return cb;
  }

  /**
   * Check if two values are loosely equal - that is,
   * if they are plain objects, do they have the same shape?
   *
   * @param {*} a
   * @param {*} b
   * @return {Boolean}
   */

  function looseEqual(a, b) {
    /* eslint-disable eqeqeq */
    return a == b || (isObject(a) && isObject(b) ? JSON.stringify(a) === JSON.stringify(b) : false);
    /* eslint-enable eqeqeq */
  }

  var hasProto = ('__proto__' in {});

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

  var devtools = inBrowser && window.__VUE_DEVTOOLS_GLOBAL_HOOK__;

  var isIE9 = inBrowser && navigator.userAgent.toLowerCase().indexOf('msie 9.0') > 0;

  var isAndroid = inBrowser && navigator.userAgent.toLowerCase().indexOf('android') > 0;

  var transitionProp = undefined;
  var transitionEndEvent = undefined;
  var animationProp = undefined;
  var animationEndEvent = undefined;

  // Transition property/event sniffing
  if (inBrowser && !isIE9) {
    var isWebkitTrans = window.ontransitionend === undefined && window.onwebkittransitionend !== undefined;
    var isWebkitAnim = window.onanimationend === undefined && window.onwebkitanimationend !== undefined;
    transitionProp = isWebkitTrans ? 'WebkitTransition' : 'transition';
    transitionEndEvent = isWebkitTrans ? 'webkitTransitionEnd' : 'transitionend';
    animationProp = isWebkitAnim ? 'WebkitAnimation' : 'animation';
    animationEndEvent = isWebkitAnim ? 'webkitAnimationEnd' : 'animationend';
  }

  /**
   * Defer a task to execute it asynchronously. Ideally this
   * should be executed as a microtask, so we leverage
   * MutationObserver if it's available, and fallback to
   * setTimeout(0).
   *
   * @param {Function} cb
   * @param {Object} ctx
   */

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

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

  function Cache(limit) {
    this.size = 0;
    this.limit = limit;
    this.head = this.tail = undefined;
    this._keymap = Object.create(null);
  }

  var p = Cache.prototype;

  /**
   * Put <value> into the cache associated with <key>.
   * Returns the entry which was removed to make room for
   * the new entry. Otherwise undefined is returned.
   * (i.e. if there was enough room already).
   *
   * @param {String} key
   * @param {*} value
   * @return {Entry|undefined}
   */

  p.put = function (key, value) {
    var removed;
    if (this.size === this.limit) {
      removed = this.shift();
    }

    var entry = this.get(key, true);
    if (!entry) {
      entry = {
        key: key
      };
      this._keymap[key] = entry;
      if (this.tail) {
        this.tail.newer = entry;
        entry.older = this.tail;
      } else {
        this.head = entry;
      }
      this.tail = entry;
      this.size++;
    }
    entry.value = value;

    return removed;
  };

  /**
   * Purge the least recently used (oldest) entry from the
   * cache. Returns the removed entry or undefined if the
   * cache was empty.
   */

  p.shift = function () {
    var entry = this.head;
    if (entry) {
      this.head = this.head.newer;
      this.head.older = undefined;
      entry.newer = entry.older = undefined;
      this._keymap[entry.key] = undefined;
      this.size--;
    }
    return entry;
  };

  /**
   * Get and register recent use of <key>. Returns the value
   * associated with <key> or undefined if not in cache.
   *
   * @param {String} key
   * @param {Boolean} returnEntry
   * @return {Entry|*}
   */

  p.get = function (key, returnEntry) {
    var entry = this._keymap[key];
    if (entry === undefined) return;
    if (entry === this.tail) {
      return returnEntry ? entry : entry.value;
    }
    // HEAD--------------TAIL
    //   <.older   .newer>
    //  <--- add direction --
    //   A  B  C  <D>  E
    if (entry.newer) {
      if (entry === this.head) {
        this.head = entry.newer;
      }
      entry.newer.older = entry.older; // C <-- E.
    }
    if (entry.older) {
      entry.older.newer = entry.newer; // C. --> E
    }
    entry.newer = undefined; // D --x
    entry.older = this.tail; // D. --> E
    if (this.tail) {
      this.tail.newer = entry; // E. <-- D
    }
    this.tail = entry;
    return returnEntry ? entry : entry.value;
  };

  var cache$1 = new Cache(1000);
  var filterTokenRE = /[^\s'"]+|'[^']*'|"[^"]*"/g;
  var reservedArgRE = /^in$|^-?\d+/;

  /**
   * Parser state
   */

  var str;
  var dir;
  var c;
  var prev;
  var i;
  var l;
  var lastFilterIndex;
  var inSingle;
  var inDouble;
  var curly;
  var square;
  var paren;
  /**
   * Push a filter to the current directive object
   */

  function pushFilter() {
    var exp = str.slice(lastFilterIndex, i).trim();
    var filter;
    if (exp) {
      filter = {};
      var tokens = exp.match(filterTokenRE);
      filter.name = tokens[0];
      if (tokens.length > 1) {
        filter.args = tokens.slice(1).map(processFilterArg);
      }
    }
    if (filter) {
      (dir.filters = dir.filters || []).push(filter);
    }
    lastFilterIndex = i + 1;
  }

  /**
   * Check if an argument is dynamic and strip quotes.
   *
   * @param {String} arg
   * @return {Object}
   */

  function processFilterArg(arg) {
    if (reservedArgRE.test(arg)) {
      return {
        value: toNumber(arg),
        dynamic: false
      };
    } else {
      var stripped = stripQuotes(arg);
      var dynamic = stripped === arg;
      return {
        value: dynamic ? arg : stripped,
        dynamic: dynamic
      };
    }
  }

  /**
   * Parse a directive value and extract the expression
   * and its filters into a descriptor.
   *
   * Example:
   *
   * "a + 1 | uppercase" will yield:
   * {
   *   expression: 'a + 1',
   *   filters: [
   *     { name: 'uppercase', args: null }
   *   ]
   * }
   *
   * @param {String} str
   * @return {Object}
   */

  function parseDirective(s) {

    var hit = cache$1.get(s);
    if (hit) {
      return hit;
    }

    // reset parser state
    str = s;
    inSingle = inDouble = false;
    curly = square = paren = 0;
    lastFilterIndex = 0;
    dir = {};

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

    if (dir.expression == null) {
      dir.expression = str.slice(0, i).trim();
    } else if (lastFilterIndex !== 0) {
      pushFilter();
    }

    cache$1.put(s, dir);
    return dir;
  }

  var directive = Object.freeze({
    parseDirective: parseDirective
  });

  var regexEscapeRE = /[-.*+?^${}()|[\]\/\\]/g;
  var cache = undefined;
  var tagRE = undefined;
  var htmlRE = undefined;
  /**
   * Escape a string so it can be used in a RegExp
   * constructor.
   *
   * @param {String} str
   */

  function escapeRegex(str) {
    return str.replace(regexEscapeRE, '\\$&');
  }

  function compileRegex() {
    var open = escapeRegex(config.delimiters[0]);
    var close = escapeRegex(config.delimiters[1]);
    var unsafeOpen = escapeRegex(config.unsafeDelimiters[0]);
    var unsafeClose = escapeRegex(config.unsafeDelimiters[1]);
    tagRE = new RegExp(unsafeOpen + '(.+?)' + unsafeClose + '|' + open + '(.+?)' + close, 'g');
    htmlRE = new RegExp('^' + unsafeOpen + '.*' + unsafeClose + '$');
    // reset cache
    cache = new Cache(1000);
  }

  /**
   * Parse a template text string into an array of tokens.
   *
   * @param {String} text
   * @return {Array<Object> | null}
   *               - {String} type
   *               - {String} value
   *               - {Boolean} [html]
   *               - {Boolean} [oneTime]
   */

  function parseText(text) {
    if (!cache) {
      compileRegex();
    }
    var hit = cache.get(text);
    if (hit) {
      return hit;
    }
    text = text.replace(/\n/g, '');
    if (!tagRE.test(text)) {
      return null;
    }
    var tokens = [];
    var lastIndex = tagRE.lastIndex = 0;
    var match, index, html, value, first, oneTime;
    /* eslint-disable no-cond-assign */
    while (match = tagRE.exec(text)) {
      /* eslint-enable no-cond-assign */
      index = match.index;
      // push text token
      if (index > lastIndex) {
        tokens.push({
          value: text.slice(lastIndex, index)
        });
      }
      // tag token
      html = htmlRE.test(match[0]);
      value = html ? match[1] : match[2];
      first = value.charCodeAt(0);
      oneTime = first === 42; // *
      value = oneTime ? value.slice(1) : value;
      tokens.push({
        tag: true,
        value: value.trim(),
        html: html,
        oneTime: oneTime
      });
      lastIndex = index + match[0].length;
    }
    if (lastIndex < text.length) {
      tokens.push({
        value: text.slice(lastIndex)
      });
    }
    cache.put(text, tokens);
    return tokens;
  }

  /**
   * Format a list of tokens into an expression.
   * e.g. tokens parsed from 'a {{b}} c' can be serialized
   * into one single expression as '"a " + b + " c"'.
   *
   * @param {Array} tokens
   * @param {Vue} [vm]
   * @return {String}
   */

  function tokensToExp(tokens, vm) {
    if (tokens.length > 1) {
      return tokens.map(function (token) {
        return formatToken(token, vm);
      }).join('+');
    } else {
      return formatToken(tokens[0], vm, true);
    }
  }

  /**
   * Format a single token.
   *
   * @param {Object} token
   * @param {Vue} [vm]
   * @param {Boolean} [single]
   * @return {String}
   */

  function formatToken(token, vm, single) {
    return token.tag ? token.oneTime && vm ? '"' + vm.$eval(token.value) + '"' : inlineFilters(token.value, single) : '"' + token.value + '"';
  }

  /**
   * For an attribute with multiple interpolation tags,
   * e.g. attr="some-{{thing | filter}}", in order to combine
   * the whole thing into a single watchable expression, we
   * have to inline those filters. This function does exactly
   * that. This is a bit hacky but it avoids heavy changes
   * to directive parser and watcher mechanism.
   *
   * @param {String} exp
   * @param {Boolean} single
   * @return {String}
   */

  var filterRE$1 = /[^|]\|[^|]/;
  function inlineFilters(exp, single) {
    if (!filterRE$1.test(exp)) {
      return single ? exp : '(' + exp + ')';
    } else {
      var dir = parseDirective(exp);
      if (!dir.filters) {
        return '(' + exp + ')';
      } else {
        return 'this._applyFilters(' + dir.expression + // value
        ',null,' + // oldValue (null for read)
        JSON.stringify(dir.filters) + // filter descriptors
        ',false)'; // write?
      }
    }
  }

  var text$1 = Object.freeze({
    compileRegex: compileRegex,
    parseText: parseText,
    tokensToExp: tokensToExp
  });

  var delimiters = ['{{', '}}'];
  var unsafeDelimiters = ['{{{', '}}}'];

  var config = Object.defineProperties({

    /**
     * Whether to print debug messages.
     * Also enables stack trace for warnings.
     *
     * @type {Boolean}
     */

    debug: false,

    /**
     * Whether to suppress warnings.
     *
     * @type {Boolean}
     */

    silent: false,

    /**
     * Whether to use async rendering.
     */

    async: true,

    /**
     * Whether to warn against errors caught when evaluating
     * expressions.
     */

    warnExpressionErrors: true,

    /**
     * Whether or not to handle fully object properties which
     * are already backed by getters and seters. Depending on
     * use case and environment, this might introduce non-neglible
     * performance penalties.
     */
    convertAllProperties: false,

    /**
     * Internal flag to indicate the delimiters have been
     * changed.
     *
     * @type {Boolean}
     */

    _delimitersChanged: true,

    /**
     * List of asset types that a component can own.
     *
     * @type {Array}
     */

    _assetTypes: ['component', 'directive', 'elementDirective', 'filter', 'transition', 'partial'],

    /**
     * prop binding modes
     */

    _propBindingModes: {
      ONE_WAY: 0,
      TWO_WAY: 1,
      ONE_TIME: 2
    },

    /**
     * Max circular updates allowed in a batcher flush cycle.
     */

    _maxUpdateCount: 100

  }, {
    delimiters: { /**
                   * Interpolation delimiters. Changing these would trigger
                   * the text parser to re-compile the regular expressions.
                   *
                   * @type {Array<String>}
                   */

      get: function get() {
        return delimiters;
      },
      set: function set(val) {
        delimiters = val;
        compileRegex();
      },
      configurable: true,
      enumerable: true
    },
    unsafeDelimiters: {
      get: function get() {
        return unsafeDelimiters;
      },
      set: function set(val) {
        unsafeDelimiters = val;
        compileRegex();
      },
      configurable: true,
      enumerable: true
    }
  });

  var warn = undefined;

  if ('development' !== 'production') {
    (function () {
      var hasConsole = typeof console !== 'undefined';
      warn = function (msg, e) {
        if (hasConsole && (!config.silent || config.debug)) {
          console.warn('[Vue warn]: ' + msg);
          /* istanbul ignore if */
          if (config.debug) {
            if (e) {
              throw e;
            } else {
              console.warn(new Error('Warning Stack Trace').stack);
            }
          }
        }
      };
    })();
  }

  /**
   * Append with transition.
   *
   * @param {Element} el
   * @param {Element} target
   * @param {Vue} vm
   * @param {Function} [cb]
   */

  function appendWithTransition(el, target, vm, cb) {
    applyTransition(el, 1, function () {
      target.appendChild(el);
    }, vm, cb);
  }

  /**
   * InsertBefore with transition.
   *
   * @param {Element} el
   * @param {Element} target
   * @param {Vue} vm
   * @param {Function} [cb]
   */

  function beforeWithTransition(el, target, vm, cb) {
    applyTransition(el, 1, function () {
      before(el, target);
    }, vm, cb);
  }

  /**
   * Remove with transition.
   *
   * @param {Element} el
   * @param {Vue} vm
   * @param {Function} [cb]
   */

  function removeWithTransition(el, vm, cb) {
    applyTransition(el, -1, function () {
      remove(el);
    }, vm, cb);
  }

  /**
   * Apply transitions with an operation callback.
   *
   * @param {Element} el
   * @param {Number} direction
   *                  1: enter
   *                 -1: leave
   * @param {Function} op - the actual DOM operation
   * @param {Vue} vm
   * @param {Function} [cb]
   */

  function applyTransition(el, direction, op, vm, cb) {
    var transition = el.__v_trans;
    if (!transition ||
    // skip if there are no js hooks and CSS transition is
    // not supported
    !transition.hooks && !transitionEndEvent ||
    // skip transitions for initial compile
    !vm._isCompiled ||
    // if the vm is being manipulated by a parent directive
    // during the parent's compilation phase, skip the
    // animation.
    vm.$parent && !vm.$parent._isCompiled) {
      op();
      if (cb) cb();
      return;
    }
    var action = direction > 0 ? 'enter' : 'leave';
    transition[action](op, cb);
  }

  /**
   * Query an element selector if it's not an element already.
   *
   * @param {String|Element} el
   * @return {Element}
   */

  function query(el) {
    if (typeof el === 'string') {
      var selector = el;
      el = document.querySelector(el);
      if (!el) {
        'development' !== 'production' && warn('Cannot find element: ' + selector);
      }
    }
    return el;
  }

  /**
   * Check if a node is in the document.
   * Note: document.documentElement.contains should work here
   * but always returns false for comment nodes in phantomjs,
   * making unit tests difficult. This is fixed by doing the
   * contains() check on the node's parentNode instead of
   * the node itself.
   *
   * @param {Node} node
   * @return {Boolean}
   */

  function inDoc(node) {
    var doc = document.documentElement;
    var parent = node && node.parentNode;
    return doc === node || doc === parent || !!(parent && parent.nodeType === 1 && doc.contains(parent));
  }

  /**
   * Get and remove an attribute from a node.
   *
   * @param {Node} node
   * @param {String} _attr
   */

  function getAttr(node, _attr) {
    var val = node.getAttribute(_attr);
    if (val !== null) {
      node.removeAttribute(_attr);
    }
    return val;
  }

  /**
   * Get an attribute with colon or v-bind: prefix.
   *
   * @param {Node} node
   * @param {String} name
   * @return {String|null}
   */

  function getBindAttr(node, name) {
    var val = getAttr(node, ':' + name);
    if (val === null) {
      val = getAttr(node, 'v-bind:' + name);
    }
    return val;
  }

  /**
   * Check the presence of a bind attribute.
   *
   * @param {Node} node
   * @param {String} name
   * @return {Boolean}
   */

  function hasBindAttr(node, name) {
    return node.hasAttribute(name) || node.hasAttribute(':' + name) || node.hasAttribute('v-bind:' + name);
  }

  /**
   * Insert el before target
   *
   * @param {Element} el
   * @param {Element} target
   */

  function before(el, target) {
    target.parentNode.insertBefore(el, target);
  }

  /**
   * Insert el after target
   *
   * @param {Element} el
   * @param {Element} target
   */

  function after(el, target) {
    if (target.nextSibling) {
      before(el, target.nextSibling);
    } else {
      target.parentNode.appendChild(el);
    }
  }

  /**
   * Remove el from DOM
   *
   * @param {Element} el
   */

  function remove(el) {
    el.parentNode.removeChild(el);
  }

  /**
   * Prepend el to target
   *
   * @param {Element} el
   * @param {Element} target
   */

  function prepend(el, target) {
    if (target.firstChild) {
      before(el, target.firstChild);
    } else {
      target.appendChild(el);
    }
  }

  /**
   * Replace target with el
   *
   * @param {Element} target
   * @param {Element} el
   */

  function replace(target, el) {
    var parent = target.parentNode;
    if (parent) {
      parent.replaceChild(el, target);
    }
  }

  /**
   * Add event listener shorthand.
   *
   * @param {Element} el
   * @param {String} event
   * @param {Function} cb
   * @param {Boolean} [useCapture]
   */

  function on$1(el, event, cb, useCapture) {
    el.addEventListener(event, cb, useCapture);
  }

  /**
   * Remove event listener shorthand.
   *
   * @param {Element} el
   * @param {String} event
   * @param {Function} cb
   */

  function off(el, event, cb) {
    el.removeEventListener(event, cb);
  }

  /**
   * In IE9, setAttribute('class') will result in empty class
   * if the element also has the :class attribute; However in
   * PhantomJS, setting `className` does not work on SVG elements...
   * So we have to do a conditional check here.
   *
   * @param {Element} el
   * @param {String} cls
   */

  function setClass(el, cls) {
    /* istanbul ignore if */
    if (isIE9 && !(el instanceof SVGElement)) {
      el.className = cls;
    } else {
      el.setAttribute('class', cls);
    }
  }

  /**
   * Add class with compatibility for IE & SVG
   *
   * @param {Element} el
   * @param {String} cls
   */

  function addClass(el, cls) {
    if (el.classList) {
      el.classList.add(cls);
    } else {
      var cur = ' ' + (el.getAttribute('class') || '') + ' ';
      if (cur.indexOf(' ' + cls + ' ') < 0) {
        setClass(el, (cur + cls).trim());
      }
    }
  }

  /**
   * Remove class with compatibility for IE & SVG
   *
   * @param {Element} el
   * @param {String} cls
   */

  function removeClass(el, cls) {
    if (el.classList) {
      el.classList.remove(cls);
    } else {
      var cur = ' ' + (el.getAttribute('class') || '') + ' ';
      var tar = ' ' + cls + ' ';
      while (cur.indexOf(tar) >= 0) {
        cur = cur.replace(tar, ' ');
      }
      setClass(el, cur.trim());
    }
    if (!el.className) {
      el.removeAttribute('class');
    }
  }

  /**
   * Extract raw content inside an element into a temporary
   * container div
   *
   * @param {Element} el
   * @param {Boolean} asFragment
   * @return {Element}
   */

  function extractContent(el, asFragment) {
    var child;
    var rawContent;
    /* istanbul ignore if */
    if (isTemplate(el) && el.content instanceof DocumentFragment) {
      el = el.content;
    }
    if (el.hasChildNodes()) {
      trimNode(el);
      rawContent = asFragment ? document.createDocumentFragment() : document.createElement('div');
      /* eslint-disable no-cond-assign */
      while (child = el.firstChild) {
        /* eslint-enable no-cond-assign */
        rawContent.appendChild(child);
      }
    }
    return rawContent;
  }

  /**
   * Trim possible empty head/tail text and comment
   * nodes inside a parent.
   *
   * @param {Node} node
   */

  function trimNode(node) {
    var child;
    /* eslint-disable no-sequences */
    while ((child = node.firstChild, isTrimmable(child))) {
      node.removeChild(child);
    }
    while ((child = node.lastChild, isTrimmable(child))) {
      node.removeChild(child);
    }
    /* eslint-enable no-sequences */
  }

  function isTrimmable(node) {
    return node && (node.nodeType === 3 && !node.data.trim() || node.nodeType === 8);
  }

  /**
   * Check if an element is a template tag.
   * Note if the template appears inside an SVG its tagName
   * will be in lowercase.
   *
   * @param {Element} el
   */

  function isTemplate(el) {
    return el.tagName && el.tagName.toLowerCase() === 'template';
  }

  /**
   * Create an "anchor" for performing dom insertion/removals.
   * This is used in a number of scenarios:
   * - fragment instance
   * - v-html
   * - v-if
   * - v-for
   * - component
   *
   * @param {String} content
   * @param {Boolean} persist - IE trashes empty textNodes on
   *                            cloneNode(true), so in certain
   *                            cases the anchor needs to be
   *                            non-empty to be persisted in
   *                            templates.
   * @return {Comment|Text}
   */

  function createAnchor(content, persist) {
    var anchor = config.debug ? document.createComment(content) : document.createTextNode(persist ? ' ' : '');
    anchor.__vue_anchor = true;
    return anchor;
  }

  /**
   * Find a component ref attribute that starts with $.
   *
   * @param {Element} node
   * @return {String|undefined}
   */

  var refRE = /^v-ref:/;

  function findRef(node) {
    if (node.hasAttributes()) {
      var attrs = node.attributes;
      for (var i = 0, l = attrs.length; i < l; i++) {
        var name = attrs[i].name;
        if (refRE.test(name)) {
          return camelize(name.replace(refRE, ''));
        }
      }
    }
  }

  /**
   * Map a function to a range of nodes .
   *
   * @param {Node} node
   * @param {Node} end
   * @param {Function} op
   */

  function mapNodeRange(node, end, op) {
    var next;
    while (node !== end) {
      next = node.nextSibling;
      op(node);
      node = next;
    }
    op(end);
  }

  /**
   * Remove a range of nodes with transition, store
   * the nodes in a fragment with correct ordering,
   * and call callback when done.
   *
   * @param {Node} start
   * @param {Node} end
   * @param {Vue} vm
   * @param {DocumentFragment} frag
   * @param {Function} cb
   */

  function removeNodeRange(start, end, vm, frag, cb) {
    var done = false;
    var removed = 0;
    var nodes = [];
    mapNodeRange(start, end, function (node) {
      if (node === end) done = true;
      nodes.push(node);
      removeWithTransition(node, vm, onRemoved);
    });
    function onRemoved() {
      removed++;
      if (done && removed >= nodes.length) {
        for (var i = 0; i < nodes.length; i++) {
          frag.appendChild(nodes[i]);
        }
        cb && cb();
      }
    }
  }

  var commonTagRE = /^(div|p|span|img|a|b|i|br|ul|ol|li|h1|h2|h3|h4|h5|h6|code|pre|table|th|td|tr|form|label|input|select|option|nav|article|section|header|footer)$/;
  var reservedTagRE = /^(slot|partial|component)$/;

  /**
   * Check if an element is a component, if yes return its
   * component id.
   *
   * @param {Element} el
   * @param {Object} options
   * @return {Object|undefined}
   */

  function checkComponentAttr(el, options) {
    var tag = el.tagName.toLowerCase();
    var hasAttrs = el.hasAttributes();
    if (!commonTagRE.test(tag) && !reservedTagRE.test(tag)) {
      if (resolveAsset(options, 'components', tag)) {
        return { id: tag };
      } else {
        var is = hasAttrs && getIsBinding(el);
        if (is) {
          return is;
        } else if ('development' !== 'production') {
          if (tag.indexOf('-') > -1 || /HTMLUnknownElement/.test(el.toString()) &&
          // Chrome returns unknown for several HTML5 elements.
          // https://code.google.com/p/chromium/issues/detail?id=540526
          !/^(data|time|rtc|rb)$/.test(tag)) {
            warn('Unknown custom element: <' + tag + '> - did you ' + 'register the component correctly? For recursive components, ' + 'make sure to provide the "name" option.');
          }
        }
      }
    } else if (hasAttrs) {
      return getIsBinding(el);
    }
  }

  /**
   * Get "is" binding from an element.
   *
   * @param {Element} el
   * @return {Object|undefined}
   */

  function getIsBinding(el) {
    // dynamic syntax
    var exp = getAttr(el, 'is');
    if (exp != null) {
      return { id: exp };
    } else {
      exp = getBindAttr(el, 'is');
      if (exp != null) {
        return { id: exp, dynamic: true };
      }
    }
  }

  /**
   * Set a prop's initial value on a vm and its data object.
   *
   * @param {Vue} vm
   * @param {Object} prop
   * @param {*} value
   */

  function initProp(vm, prop, value) {
    var key = prop.path;
    value = coerceProp(prop, value);
    vm[key] = vm._data[key] = assertProp(prop, value) ? value : undefined;
  }

  /**
   * Assert whether a prop is valid.
   *
   * @param {Object} prop
   * @param {*} value
   */

  function assertProp(prop, value) {
    // if a prop is not provided and is not required,
    // skip the check.
    if (prop.raw === null && !prop.required) {
      return true;
    }
    var options = prop.options;
    var type = options.type;
    var valid = true;
    var expectedType;
    if (type) {
      if (type === String) {
        expectedType = 'string';
        valid = typeof value === expectedType;
      } else if (type === Number) {
        expectedType = 'number';
        valid = typeof value === 'number';
      } else if (type === Boolean) {
        expectedType = 'boolean';
        valid = typeof value === 'boolean';
      } else if (type === Function) {
        expectedType = 'function';
        valid = typeof value === 'function';
      } else if (type === Object) {
        expectedType = 'object';
        valid = isPlainObject(value);
      } else if (type === Array) {
        expectedType = 'array';
        valid = isArray(value);
      } else {
        valid = value instanceof type;
      }
    }
    if (!valid) {
      'development' !== 'production' && warn('Invalid prop: type check failed for ' + prop.path + '="' + prop.raw + '".' + ' Expected ' + formatType(expectedType) + ', got ' + formatValue(value) + '.');
      return false;
    }
    var validator = options.validator;
    if (validator) {
      if (!validator.call(null, value)) {
        'development' !== 'production' && warn('Invalid prop: custom validator check failed for ' + prop.path + '="' + prop.raw + '"');
        return false;
      }
    }
    return true;
  }

  /**
   * Force parsing value with coerce option.
   *
   * @param {*} value
   * @param {Object} options
   * @return {*}
   */

  function coerceProp(prop, value) {
    var coerce = prop.options.coerce;
    if (!coerce) {
      return value;
    }
    // coerce is a function
    return coerce(value);
  }

  function formatType(val) {
    return val ? val.charAt(0).toUpperCase() + val.slice(1) : 'custom type';
  }

  function formatValue(val) {
    return Object.prototype.toString.call(val).slice(8, -1);
  }

  /**
   * Option overwriting strategies are functions that handle
   * how to merge a parent option value and a child option
   * value into the final value.
   *
   * All strategy functions follow the same signature:
   *
   * @param {*} parentVal
   * @param {*} childVal
   * @param {Vue} [vm]
   */

  var strats = config.optionMergeStrategies = Object.create(null);

  /**
   * Helper that recursively merges two data objects together.
   */

  function mergeData(to, from) {
    var key, toVal, fromVal;
    for (key in from) {
      toVal = to[key];
      fromVal = from[key];
      if (!hasOwn(to, key)) {
        set(to, key, fromVal);
      } else if (isObject(toVal) && isObject(fromVal)) {
        mergeData(toVal, fromVal);
      }
    }
    return to;
  }

  /**
   * Data
   */

  strats.data = function (parentVal, childVal, vm) {
    if (!vm) {
      // in a Vue.extend merge, both should be functions
      if (!childVal) {
        return parentVal;
      }
      if (typeof childVal !== 'function') {
        'development' !== 'production' && warn('The "data" option should be a function ' + 'that returns a per-instance value in component ' + 'definitions.');
        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;
        }
      };
    }
  };

  /**
   * El
   */

  strats.el = function (parentVal, childVal, vm) {
    if (!vm && childVal && typeof childVal !== 'function') {
      'development' !== 'production' && warn('The "el" option should be a function ' + 'that returns a per-instance value in component ' + 'definitions.');
      return;
    }
    var ret = childVal || parentVal;
    // invoke the element factory if this is instance merge
    return vm && typeof ret === 'function' ? ret.call(vm) : ret;
  };

  /**
   * Hooks and param attributes are merged as arrays.
   */

  strats.init = strats.created = strats.ready = strats.attached = strats.detached = strats.beforeCompile = strats.compiled = strats.beforeDestroy = strats.destroyed = function (parentVal, childVal) {
    return childVal ? parentVal ? parentVal.concat(childVal) : isArray(childVal) ? childVal : [childVal] : parentVal;
  };

  /**
   * 0.11 deprecation warning
   */

  strats.paramAttributes = function () {
    /* istanbul ignore next */
    'development' !== 'production' && warn('"paramAttributes" option has been deprecated in 0.12. ' + 'Use "props" instead.');
  };

  /**
   * 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);
    return childVal ? extend(res, guardArrayAssets(childVal)) : res;
  }

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

  /**
   * Events & Watchers.
   *
   * Events & watchers hashes should not overwrite one
   * another, so we merge them as arrays.
   */

  strats.watch = strats.events = function (parentVal, childVal) {
    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 && !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 defaultStrat(parentVal, childVal) {
    return childVal === undefined ? parentVal : childVal;
  };

  /**
   * Make sure component options get converted to actual
   * constructors.
   *
   * @param {Object} options
   */

  function guardComponents(options) {
    if (options.components) {
      var components = options.components = guardArrayAssets(options.components);
      var def;
      var ids = Object.keys(components);
      for (var i = 0, l = ids.length; i < l; i++) {
        var key = ids[i];
        if (commonTagRE.test(key) || reservedTagRE.test(key)) {
          'development' !== 'production' && warn('Do not use built-in or reserved HTML elements as component ' + 'id: ' + key);
          continue;
        }
        def = components[key];
        if (isPlainObject(def)) {
          components[key] = Vue.extend(def);
        }
      }
    }
  }

  /**
   * Ensure all props option syntax are normalized into the
   * Object-based format.
   *
   * @param {Object} options
   */

  function guardProps(options) {
    var props = options.props;
    var i, val;
    if (isArray(props)) {
      options.props = {};
      i = props.length;
      while (i--) {
        val = props[i];
        if (typeof val === 'string') {
          options.props[val] = null;
        } else if (val.name) {
          options.props[val.name] = val;
        }
      }
    } else if (isPlainObject(props)) {
      var keys = Object.keys(props);
      i = keys.length;
      while (i--) {
        val = props[keys[i]];
        if (typeof val === 'function') {
          props[keys[i]] = { type: val };
        }
      }
    }
  }

  /**
   * Guard an Array-format assets option and converted it
   * into the key-value Object format.
   *
   * @param {Object|Array} assets
   * @return {Object}
   */

  function guardArrayAssets(assets) {
    if (isArray(assets)) {
      var res = {};
      var i = assets.length;
      var asset;
      while (i--) {
        asset = assets[i];
        var id = typeof asset === 'function' ? asset.options && asset.options.name || asset.id : asset.name || asset.id;
        if (!id) {
          'development' !== 'production' && warn('Array-syntax assets must provide a "name" or "id" field.');
        } else {
          res[id] = asset;
        }
      }
      return res;
    }
    return assets;
  }

  /**
   * Merge two option objects into a new one.
   * Core utility used in both instantiation and inheritance.
   *
   * @param {Object} parent
   * @param {Object} child
   * @param {Vue} [vm] - if vm is present, indicates this is
   *                     an instantiation merge.
   */

  function mergeOptions(parent, child, vm) {
    guardComponents(child);
    guardProps(child);
    var options = {};
    var key;
    if (child.mixins) {
      for (var i = 0, l = child.mixins.length; i < l; i++) {
        parent = mergeOptions(parent, child.mixins[i], vm);
      }
    }
    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.
   *
   * @param {Object} options
   * @param {String} type
   * @param {String} id
   * @return {Object|Function}
   */

  function resolveAsset(options, type, id) {
    /* istanbul ignore if */
    if (typeof id !== 'string') {
      return;
    }
    var assets = options[type];
    var camelizedId;
    return assets[id] ||
    // camelCase ID
    assets[camelizedId = camelize(id)] ||
    // Pascal Case ID
    assets[camelizedId.charAt(0).toUpperCase() + camelizedId.slice(1)];
  }

  /**
   * Assert asset exists
   */

  function assertAsset(val, type, id) {
    if (!val) {
      'development' !== 'production' && warn('Failed to resolve ' + type + ': ' + id);
    }
  }

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

  /**
   * Intercept mutating methods and emit events
   */

  ;['push', 'pop', 'shift', 'unshift', 'splice', 'sort', 'reverse'].forEach(function (method) {
    // cache original method
    var original = arrayProto[method];
    def(arrayMethods, method, function mutator() {
      // avoid leaking arguments:
      // http://jsperf.com/closure-with-arguments
      var i = arguments.length;
      var args = new Array(i);
      while (i--) {
        args[i] = arguments[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;
    });
  });

  /**
   * Swap the element at the given index with a new value
   * and emits corresponding event.
   *
   * @param {Number} index
   * @param {*} val
   * @return {*} - replaced element
   */

  def(arrayProto, '$set', function $set(index, val) {
    if (index >= this.length) {
      this.length = Number(index) + 1;
    }
    return this.splice(index, 1, val)[0];
  });

  /**
   * Convenience method to remove the element at given index.
   *
   * @param {Number} index
   * @param {*} val
   */

  def(arrayProto, '$remove', function $remove(item) {
    /* istanbul ignore if */
    if (!this.length) return;
    var index = indexOf(this, item);
    if (index > -1) {
      return this.splice(index, 1);
    }
  });

  var uid$3 = 0;

  /**
   * A dep is an observable that can have multiple
   * directives subscribing to it.
   *
   * @constructor
   */
  function Dep() {
    this.id = uid$3++;
    this.subs = [];
  }

  // 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;

  /**
   * Add a directive subscriber.
   *
   * @param {Directive} sub
   */

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

  /**
   * Remove a directive subscriber.
   *
   * @param {Directive} sub
   */

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

  /**
   * Add self as a dependency to the target watcher.
   */

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

  /**
   * Notify all subscribers of a new value.
   */

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

  var arrayKeys = Object.getOwnPropertyNames(arrayMethods);

  /**
   * 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.
   *
   * @param {Array|Object} value
   * @constructor
   */

  function Observer(value) {
    this.value = value;
    this.dep = new Dep();
    def(value, '__ob__', this);
    if (isArray(value)) {
      var augment = hasProto ? protoAugment : copyAugment;
      augment(value, arrayMethods, arrayKeys);
      this.observeArray(value