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<script>
export default {
name: 'app-keep-alive',
render: function render() {
let _this = this;
let slot = _this.$slots.default;
let vnode = _this.getFirstComponentChild(slot);
let componentOptions = vnode && vnode.componentOptions;
if (componentOptions) {
// check pattern
let name = _this.getComponentName(componentOptions);
let ref = _this;
let include = ref.include;
let exclude = ref.exclude;
let routerList = ref.routerList;
let route = ref.$route;
if (
// not included
(include && (!name || !_this.matches(include, name))) ||
// excluded
(exclude && name && _this.matches(exclude, name)) ||
(routerList && (!route.fullPath && !_this.matches(routerList, route.fullPath)))
) {
return vnode
}
let ref$1 = _this;
let cache = ref$1.cache;
let keys = ref$1.keys;
let key = vnode.key == null
// same constructor may get registered as different local components
// so cid alone is not enough (#3269)
? componentOptions.Ctor.cid + (componentOptions.tag ? ("::" + (componentOptions.tag)) : '')
: vnode.key;
if (cache[key]) {
vnode.componentInstance = cache[key].componentInstance;
// make current key freshest
_this.remove(keys, key);
keys.push(key);
} else {
cache[key] = vnode;
keys.push(key);
// prune oldest entry
if (_this.max && keys.length > parseInt(_this.max)) {
_this.pruneCacheEntry(cache, keys[0], keys, _this._vnode);
}
}
vnode.data.keepAlive = true;
vnode.data.curPath = route.fullPath;
}
return vnode || (slot && slot[0])
},
props: {
include: [String, RegExp, Array],
exclude: [String, RegExp, Array],
max: [String, Number],
routerList: [Array]
},
data: function(){
return {
_toString: Object.prototype.toString
}
},
created: function () {
this.cache = Object.create(null);
this.keys = [];
},
destroyed: function () {
let _this = this;
for (let key in _this.cache) {
_this.pruneCacheEntry(_this.cache, key, _this.keys);
}
},
watch: {
'include': function (val) {
let _this = this;
_this.pruneCache(function (name) {
return _this.matches(val, name);
});
},
'exclude': function (val) {
let _this = this;
_this.pruneCache(function (name) {
return !_this.matches(val, name);
});
},
'routerList': function(val) {
let _this = this;
_this.pruneCache2(function (name) {
return !_this.matches(val, name);
});
}
},
methods: {
pruneCacheEntry(cache, key, keys, current) {
let cached = cache[key];
if (cached) {
cached.componentInstance.$destroy();
}
cache[key] = null;
this.remove(keys, key);
},
pruneCache(filter) {
let _this = this;
let cache = _this.cache;
let keys = _this.keys;
let _vnode = _this._vnode;
for (let key in cache) {
let cachedNode = cache[key];
if (cachedNode) {
let name = _this.getComponentName(cachedNode.componentOptions);
if (name && !filter(name)) {
_this.pruneCacheEntry(cache, key, keys, _vnode);
}
}
}
},
pruneCache2(filter) {
let _this = this;
let cache = _this.cache;
let keys = _this.keys;
let _vnode = _this._vnode;
for (let key in cache) {
let cachedNode = cache[key];
if (cachedNode) {
let name = cachedNode.data.curPath;
if (name && filter(name)) {
_this.pruneCacheEntry(cache, key, keys, _vnode);
}
}
}
},
matches(pattern, name) {
if (Array.isArray(pattern)) {
return pattern.indexOf(name) > -1
} else if (typeof pattern === 'string') {
return pattern.split(',').indexOf(name) > -1
} else if (this.isRegExp(pattern)) {
return pattern.test(name)
}
/* istanbul ignore next */
return false
},
getComponentName(opts) {
return opts && (opts.Ctor.options.name || opts.tag)
},
getFirstComponentChild(children) {
let _this = this;
if (Array.isArray(children)) {
for (let i = 0; i < children.length; i++) {
let c = children[i];
if (_this.isDef(c) && (_this.isDef(c.componentOptions) || _this.isAsyncPlaceholder(c))) {
return c
}
}
}
},
isAsyncPlaceholder(node) {
return node.isComment && node.asyncFactory
},
isDef(v) {
return v !== undefined && v !== null
},
isRegExp(v) {
return this._toString.call(v) === '[object RegExp]'
},
remove(arr, item) {
if (arr.length) {
let index = arr.indexOf(item);
if (index > -1) {
return arr.splice(index, 1)
}
}
}
}
}
</script>
<style lang="less">
</style>