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const _proxySet = new Set()
const _keyMaps = new Map()
const _triggerable = new Set()
const _triggered = new Set()
const _stack = []
const _afterTriggered = []
const _OWN_KEYS = Symbol('ownKeys as attribute')
let _handlingTriggered = false
function _reportKeyMutation (target, key) {
if (_keyMaps.has(key)) {
const keyMap = _keyMaps.get(key)
if (keyMap.has(target)) {
if (!_handlingTriggered) {
_handlingTriggered = true
requestAnimationFrame(() => {
_handlingTriggered = false
for (const callback of _triggered) {
callback()
}
_triggered.clear()
while (_afterTriggered.length) {
_afterTriggered.shift()()
}
})
}
for (const callback of keyMap.get(target)) {
_triggered.add(callback)
}
keyMap.delete(target)
if (!keyMap.size) {
_keyMaps.delete(key)
}
}
}
}
function _reportKeyAccess (target, key) {
if (_stack.length) {
if (!_keyMaps.has(key)) {
_keyMaps.set(key, new Map())
}
const keyMap = _keyMaps.get(key)
if (!keyMap.has(target)) {
keyMap.set(target, new Set())
}
keyMap.get(target).add(_stack[0])
}
}
export function proxy (target = {}) {
if (target instanceof Object && !_proxySet.has(target)) {
const _self = new Proxy(Array.isArray(target) ? new Array(target.length) : {}, {
has (target, key) {
_reportKeyAccess(target, key)
return key in target
},
get (target, key) {
_reportKeyAccess(target, key)
return target[key]
},
set (target, key, value) {
value = proxy(value)
if (target[key] !== value || key === 'length') { // array length is magical
if (!(key in target)) {
_reportKeyMutation(target, _OWN_KEYS)
}
_reportKeyMutation(target, key)
}
target[key] = value
return true
},
deleteProperty (target, key) {
if (key in target) {
_reportKeyMutation(target, _OWN_KEYS)
_reportKeyMutation(target, key)
}
return Reflect.deleteProperty(target, key)
},
ownKeys (target) {
_reportKeyAccess(target, _OWN_KEYS)
return Reflect.ownKeys(target)
}
})
Object.assign(_self, target)
_proxySet.add(_self)
target = _self
}
return target
}
export function watchFunction (f) {
function wrapped () {
if (_triggerable.has(f)) {
_stack.unshift(wrapped)
f()
_stack.shift()
}
}
if (!_triggerable.has(f)) {
_triggerable.add(f)
wrapped()
}
}
export function unwatchFunction (f) {
_triggerable.delete(f)
}
export function after (f) {
_afterTriggered.push(f)
}
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