ce4c83ff
 wxy
初始提交
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module.exports = ProtoList
function setProto(obj, proto) {
if (typeof Object.setPrototypeOf === "function")
return Object.setPrototypeOf(obj, proto)
else
obj.__proto__ = proto
}
function ProtoList () {
this.list = []
var root = null
Object.defineProperty(this, 'root', {
get: function () { return root },
set: function (r) {
root = r
if (this.list.length) {
setProto(this.list[this.list.length - 1], r)
}
},
enumerable: true,
configurable: true
})
}
ProtoList.prototype =
{ get length () { return this.list.length }
, get keys () {
var k = []
for (var i in this.list[0]) k.push(i)
return k
}
, get snapshot () {
var o = {}
this.keys.forEach(function (k) { o[k] = this.get(k) }, this)
return o
}
, get store () {
return this.list[0]
}
, push : function (obj) {
if (typeof obj !== "object") obj = {valueOf:obj}
if (this.list.length >= 1) {
setProto(this.list[this.list.length - 1], obj)
}
setProto(obj, this.root)
return this.list.push(obj)
}
, pop : function () {
if (this.list.length >= 2) {
setProto(this.list[this.list.length - 2], this.root)
}
return this.list.pop()
}
, unshift : function (obj) {
setProto(obj, this.list[0] || this.root)
return this.list.unshift(obj)
}
, shift : function () {
if (this.list.length === 1) {
setProto(this.list[0], this.root)
}
return this.list.shift()
}
, get : function (key) {
return this.list[0][key]
}
, set : function (key, val, save) {
if (!this.length) this.push({})
if (save && this.list[0].hasOwnProperty(key)) this.push({})
return this.list[0][key] = val
}
, forEach : function (fn, thisp) {
for (var key in this.list[0]) fn.call(thisp, key, this.list[0][key])
}
, slice : function () {
return this.list.slice.apply(this.list, arguments)
}
, splice : function () {
// handle injections
var ret = this.list.splice.apply(this.list, arguments)
for (var i = 0, l = this.list.length; i < l; i++) {
setProto(this.list[i], this.list[i + 1] || this.root)
}
return ret
}
}
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