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| import Dep from './dep' import VNode from '../vdom/vnode' import { def, warn, hasOwn, hasProto, isObject, isPlainObject, isPrimitive, isUndef, isValidArrayIndex, isServerRendering } from '../util/index'
export function observe (value: any, asRootData: ?boolean): Observer | void { if (!isObject(value) || value instanceof VNode) { return } let ob: Observer | void
if (hasOwn(value, '__ob__') && value.__ob__ instanceof Observer) { ob = value.__ob__ } else if ( shouldObserve && !isServerRendering() && (Array.isArray(value) || isPlainObject(value)) && Object.isExtensible(value) && !value._isVue ) { ob = new Observer(value) } if (asRootData && ob) { ob.vmCount++ } return ob }
export class Observer { value: any; dep: Dep; vmCount: number;
constructor (value: any) { this.value = value this.dep = new Dep() this.vmCount = 0
def(value, '__ob__', this)
if (Array.isArray(value)) { if (hasProto) { protoAugment(value, arrayMethods) } else { copyAugment(value, arrayMethods, arrayKeys) } this.observeArray(value) } else { this.walk(value) } }
walk (obj: Object) { const keys = Object.keys(obj)
for (let i = 0; i < keys.length; i++) { defineReactive(obj, keys[i]) } }
observeArray (items: Array<any>) { for (let i = 0, l = items.length; i < l; i++) { observe(items[i]) } } }
export function defineReactive ( obj: Object, key: string, val: any, customSetter?: ?Function, shallow?: boolean ) { const dep = new Dep()
const property = Object.getOwnPropertyDescriptor(obj, key) if (property && property.configurable === false) { return }
const getter = property && property.get const setter = property && property.set
if ((!getter || setter) && arguments.length === 2) { val = obj[key] }
let childOb = !shallow && observe(val)
Object.defineProperty(obj, key, { enumerable: true, configurable: true, get: function reactiveGetter () { const 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) { const value = getter ? getter.call(obj) : val if (newVal === value || (newVal !== newVal && value !== value)) { return } if (process.env.NODE_ENV !== 'production' && customSetter) { customSetter() } if (getter && !setter) return if (setter) { setter.call(obj, newVal) } else { val = newVal } childOb = !shallow && observe(newVal) dep.notify() } }) }
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