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'use strict'
let fastNow = Date.now()
let fastNowTimeout
const fastTimers = []
function onTimeout () {
fastNow = Date.now()
let len = fastTimers.length
let idx = 0
while (idx < len) {
const timer = fastTimers[idx]
if (timer.state === 0) {
timer.state = fastNow + timer.delay
} else if (timer.state > 0 && fastNow >= timer.state) {
timer.state = -1
timer.callback(timer.opaque)
}
if (timer.state === -1) {
timer.state = -2
if (idx !== len - 1) {
fastTimers[idx] = fastTimers.pop()
} else {
fastTimers.pop()
}
len -= 1
} else {
idx += 1
}
}
if (fastTimers.length > 0) {
refreshTimeout()
}
}
function refreshTimeout () {
if (fastNowTimeout && fastNowTimeout.refresh) {
fastNowTimeout.refresh()
} else {
clearTimeout(fastNowTimeout)
fastNowTimeout = setTimeout(onTimeout, 1e3)
if (fastNowTimeout.unref) {
fastNowTimeout.unref()
}
}
}
class Timeout {
constructor (callback, delay, opaque) {
this.callback = callback
this.delay = delay
this.opaque = opaque
// -2 not in timer list
// -1 in timer list but inactive
// 0 in timer list waiting for time
// > 0 in timer list waiting for time to expire
this.state = -2
this.refresh()
}
refresh () {
if (this.state === -2) {
fastTimers.push(this)
if (!fastNowTimeout || fastTimers.length === 1) {
refreshTimeout()
}
}
this.state = 0
}
clear () {
this.state = -1
}
}
module.exports = {
setTimeout (callback, delay, opaque) {
return delay < 1e3
? setTimeout(callback, delay, opaque)
: new Timeout(callback, delay, opaque)
},
clearTimeout (timeout) {
if (timeout instanceof Timeout) {
timeout.clear()
} else {
clearTimeout(timeout)
}
}
}
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