/* @flow */
|
|
import { _Set as Set, isObject } from '../util/index'
|
import type { SimpleSet } from '../util/index'
|
import VNode from '../vdom/vnode'
|
|
const seenObjects = new Set()
|
|
/**
|
* Recursively traverse an object to evoke all converted
|
* getters, so that every nested property inside the object
|
* is collected as a "deep" dependency.
|
*/
|
export function traverse (val: any) {
|
_traverse(val, seenObjects)
|
seenObjects.clear()
|
}
|
|
function _traverse (val: any, seen: SimpleSet) {
|
let i, keys
|
const isA = Array.isArray(val)
|
if ((!isA && !isObject(val)) || Object.isFrozen(val) || val instanceof VNode) {
|
return
|
}
|
if (val.__ob__) {
|
const 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)
|
}
|
}
|
