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import { actions } from '../action.js'
import { cloneStructures } from '../clone.js'
import { createProxy } from '../proxy.js'
function toString (value) {
const type = typeof value
if (type === 'string') return value
if (type === 'object') return '?'
if (type === 'symbol') return value.toString()
return String(value)
}
export const rawValue = (value) => {
if (!value || typeof value !== 'object') return value
const staty = value?.[kStaty]
if (staty) {
if (staty.isRef) return value
return staty.getSnapshot()
}
return cloneStructures(value, Object.prototype.toString.call(value))
}
export class InternalStaty {
constructor (source, target, { onReadOnly }) {
this.source = source
this.target = target
this.onReadOnly = onReadOnly
this.subscriptions = {
default: new Set(),
props: new Map()
}
this.propsBinded = new Map()
this.isRef = false
this.onGetSnapshot = this.onGetSnapshot.bind(this)
this._snapshot = kEmpty
/** @type {Proxy<typeof target>} */
this.proxy = null
}
forEach (callback) {
for (const prop in this.target) {
callback(this.target[prop], prop)
}
}
setProxy (proxy) {
this.proxy = proxy
}
setOnAction (onAction) {
this.onAction = {
run: actionName => onAction(this.proxy, actionName),
before: true
}
}
getValueByProp (prop) {
const value = this.reflectGet(this.target, prop)
const staty = value?.[kStaty]
if (staty && staty.isRef) return staty.getSnapshot()
return value
}
getSnapshot () {
if (this._snapshot !== kEmpty) return this._snapshot
const internal = this
const snapshot = this._snapshot = new Proxy(this.clone(), {
get (target, prop) {
const value = Reflect.get(target, prop)
if (prop === 'constructor') return value
if (value?.[kStaty]) {
return value[kStaty].getSnapshot()
}
return internal.onGetSnapshot(target, prop, value)
},
set (target, prop, value) {
internal.onReadOnly(target, prop, value)
return true
}
})
return snapshot
}
onGetSnapshot (target, prop, value) {
return value
}
clone () {
let k
const x = this.target
const tmp = Object.create(Object.getPrototypeOf(x))
for (k in x) {
tmp[k] = rawValue(x[k])
}
return tmp
}
clearSnapshot () {
this._snapshot = kEmpty
}
handler (value, prop) {
return value
}
checkCircularReference (prop, value) {
prop = toString(prop)
if (this === value) {
const err = new Error('circular reference detected')
// @ts-ignore
err.location = `^${prop}`
// @ts-ignore
err.value = value.getSnapshot()
throw err
}
this.propsBinded.forEach((parents, propBinded) => {
propBinded = toString(propBinded)
parents.forEach(parent => {
parent.checkCircularReference(`${propBinded}.${prop}`, value)
})
})
}
addParent (prop, parent, checkCircularReference) {
let parents
if (this.propsBinded.has(prop)) {
parents = this.propsBinded.get(prop)
} else {
parents = new Set()
this.propsBinded.set(prop, parents)
}
if (checkCircularReference) {
parent.checkCircularReference(prop, this)
}
parents.add(parent)
}
delParent (prop, parent) {
const parents = this.propsBinded.get(prop)
parents.delete(parent)
if (parents.size === 0) this.propsBinded.delete(prop)
}
run (prop, rollback) {
let action = actions.current
this.clearSnapshot()
let actionInitiator = false
if (rollback && (!action || action.name === kInternalAction)) {
action = actions.create(kInternalAction)
actionInitiator = true
}
try {
if (rollback) action.pushHistory(rollback)
if (this.onAction) {
action.add(this.onAction)
}
const subscriptions = this.subscriptions
if (prop) {
for (const [key, handlers] of subscriptions.props.entries()) {
if (prop.startsWith(`${key}.`) || prop === key) {
Array.from(handlers.values()).forEach(handler => {
if (action.valid(handler)) {
action.add(handler)
}
})
}
}
}
Array.from(subscriptions.default.values()).forEach(handler => {
if (action.valid(handler)) {
action.add(handler)
}
})
this.propsBinded.forEach((parents, propBinded) => {
propBinded = toString(propBinded)
parents.forEach(parent => {
parent.run(prop ? `${propBinded}.${prop}` : propBinded)
})
})
actionInitiator && action.done()
} catch (err) {
actionInitiator && action.cancel()
throw err
}
}
get (target, prop) {
return this._get(target, prop, true)
}
set (target, prop, value) {
return this._set(target, prop, value, true)
}
deleteProperty (target, prop) {
return this._deleteProperty(target, prop, true)
}
reflectSet (target, prop, value, useBaseReflect) {
return Reflect.set(target, prop, value)
}
reflectHas (target, prop, useBaseReflect) {
return Reflect.has(target, prop)
}
reflectGet (target, prop, useBaseReflect) {
return Reflect.get(target, prop)
}
reflectDeleteProperty (target, prop, useBaseReflect) {
return Reflect.deleteProperty(target, prop)
}
_get (target, prop, useBaseReflect) {
if (prop === kStaty) return this
const value = this.reflectGet(target, prop, useBaseReflect)
if (value === null || value === undefined) return value
const valueStaty = value?.[kStaty]
if (valueStaty?.isRef) {
return valueStaty.value
}
return this.handler(value, prop)
}
_set (target, prop, value, useBaseReflect) {
const internal = this
const newProp = !internal.reflectHas(target, prop, useBaseReflect)
const oldValue = internal.reflectGet(target, prop, useBaseReflect)
const oldValueStaty = oldValue?.[kStaty]
let valueStaty = value?.[kStaty]
// start ref support
if (oldValueStaty?.isRef && !valueStaty?.isRef) {
if (oldValue === value || oldValueStaty.value === value) return true
const oldRawValue = oldValueStaty.value
oldValueStaty.setValue(value)
internal.run(prop, () => {
internal.clearSnapshot()
oldValueStaty.setValue(oldRawValue)
})
return true
} else if (valueStaty?.isRef) {
if (internal.reflectSet(target, prop, value, useBaseReflect)) {
internal.run(prop, () => {
internal.clearSnapshot()
if (newProp) return internal.reflectDeleteProperty(target, prop, useBaseReflect)
internal.reflectSet(target, prop, oldValue, useBaseReflect)
})
}
return true
}
// end ref support
if (oldValue === value || (oldValueStaty && oldValueStaty.source === value)) return true
let checkCircularReference = true
let type
if (!valueStaty) {
type = Object.prototype.toString.call(value)
if (isValidForStaty(type)) {
value = createProxy({ onReadOnly: internal.onReadOnly }, value, null, null, type)
valueStaty = value[kStaty]
checkCircularReference = false
} else {
internal.reflectSet(target, prop, value, useBaseReflect)
internal.run(prop, () => {
internal.clearSnapshot()
if (newProp) {
internal.reflectDeleteProperty(target, prop, useBaseReflect)
return
}
internal.reflectSet(target, prop, oldValue, useBaseReflect)
})
return true
}
}
if (oldValueStaty !== valueStaty) {
valueStaty?.addParent(prop, internal, checkCircularReference)
oldValueStaty?.delParent(prop, internal)
}
internal.reflectSet(target, prop, value, useBaseReflect)
internal.run(prop, () => {
internal.clearSnapshot()
if (oldValueStaty !== valueStaty) {
oldValueStaty?.addParent(prop, internal)
valueStaty?.delParent(prop, internal)
}
if (newProp) {
internal.reflectDeleteProperty(target, prop, useBaseReflect)
return
}
internal.reflectSet(target, prop, oldValue, useBaseReflect)
})
return true
}
_deleteProperty (target, prop, useBaseReflect) {
const internal = this
if (!internal.reflectHas(target, prop, useBaseReflect)) return true
const oldValue = internal.reflectGet(target, prop, useBaseReflect)
oldValue?.[kStaty]?.delParent?.(prop, internal)
if (internal.reflectDeleteProperty(target, prop, useBaseReflect)) {
internal.run(prop, () => {
internal.clearSnapshot()
oldValue?.[kStaty]?.addParent?.(prop, internal)
internal.reflectSet(target, prop, oldValue, useBaseReflect)
})
}
return true
}
}
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