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308 lines (271 loc) · 9.24 KB
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// Minimal cron expression parsing and next-run calculation.
//
// Supports the standard 5-field cron subset:
// minute hour day-of-month month day-of-week
//
// Field syntax: wildcard, N, step (star-slash-N), range (N-M), list (N,M,...).
// No L, W, ?, or name aliases. All times are interpreted in the process's
// local timezone — "0 9 * * *" means 9am wherever the CLI is running.
export type CronFields = {
minute: number[]
hour: number[]
dayOfMonth: number[]
month: number[]
dayOfWeek: number[]
}
type FieldRange = { min: number; max: number }
const FIELD_RANGES: FieldRange[] = [
{ min: 0, max: 59 }, // minute
{ min: 0, max: 23 }, // hour
{ min: 1, max: 31 }, // dayOfMonth
{ min: 1, max: 12 }, // month
{ min: 0, max: 6 }, // dayOfWeek (0=Sunday; 7 accepted as Sunday alias)
]
// Parse a single cron field into a sorted array of matching values.
// Supports: wildcard, N, star-slash-N (step), N-M (range), and comma-lists.
// Returns null if invalid.
function expandField(field: string, range: FieldRange): number[] | null {
const { min, max } = range
const out = new Set<number>()
for (const part of field.split(',')) {
// wildcard or star-slash-N
const stepMatch = part.match(/^\*(?:\/(\d+))?$/)
if (stepMatch) {
const step = stepMatch[1] ? parseInt(stepMatch[1], 10) : 1
if (step < 1) return null
for (let i = min; i <= max; i += step) out.add(i)
continue
}
// N-M or N-M/S
const rangeMatch = part.match(/^(\d+)-(\d+)(?:\/(\d+))?$/)
if (rangeMatch) {
const lo = parseInt(rangeMatch[1]!, 10)
const hi = parseInt(rangeMatch[2]!, 10)
const step = rangeMatch[3] ? parseInt(rangeMatch[3], 10) : 1
// dayOfWeek: accept 7 as Sunday alias in ranges (e.g. 5-7 = Fri,Sat,Sun → [5,6,0])
const isDow = min === 0 && max === 6
const effMax = isDow ? 7 : max
if (lo > hi || step < 1 || lo < min || hi > effMax) return null
for (let i = lo; i <= hi; i += step) {
out.add(isDow && i === 7 ? 0 : i)
}
continue
}
// plain N
const singleMatch = part.match(/^\d+$/)
if (singleMatch) {
let n = parseInt(part, 10)
// dayOfWeek: accept 7 as Sunday alias → 0
if (min === 0 && max === 6 && n === 7) n = 0
if (n < min || n > max) return null
out.add(n)
continue
}
return null
}
if (out.size === 0) return null
return Array.from(out).sort((a, b) => a - b)
}
/**
* Parse a 5-field cron expression into expanded number arrays.
* Returns null if invalid or unsupported syntax.
*/
export function parseCronExpression(expr: string): CronFields | null {
const parts = expr.trim().split(/\s+/)
if (parts.length !== 5) return null
const expanded: number[][] = []
for (let i = 0; i < 5; i++) {
const result = expandField(parts[i]!, FIELD_RANGES[i]!)
if (!result) return null
expanded.push(result)
}
return {
minute: expanded[0]!,
hour: expanded[1]!,
dayOfMonth: expanded[2]!,
month: expanded[3]!,
dayOfWeek: expanded[4]!,
}
}
/**
* Compute the next Date strictly after `from` that matches the cron fields,
* using the process's local timezone. Walks forward minute-by-minute. Bounded
* at 366 days; returns null if no match (impossible for valid cron, but
* satisfies the type).
*
* Standard cron semantics: when both dayOfMonth and dayOfWeek are constrained
* (neither is the full range), a date matches if EITHER matches.
*
* DST: fixed-hour crons targeting a spring-forward gap (e.g. `30 2 * * *`
* in a US timezone) skip the transition day — the gap hour never appears
* in local time, so the hour-set check fails and the loop moves on.
* Wildcard-hour crons (`30 * * * *`) fire at the first valid minute after
* the gap. Fall-back repeats fire once (the step-forward logic jumps past
* the second occurrence). This matches vixie-cron behavior.
*/
export function computeNextCronRun(
fields: CronFields,
from: Date,
): Date | null {
const minuteSet = new Set(fields.minute)
const hourSet = new Set(fields.hour)
const domSet = new Set(fields.dayOfMonth)
const monthSet = new Set(fields.month)
const dowSet = new Set(fields.dayOfWeek)
// Is the field wildcarded (full range)?
const domWild = fields.dayOfMonth.length === 31
const dowWild = fields.dayOfWeek.length === 7
// Round up to the next whole minute (strictly after `from`)
const t = new Date(from.getTime())
t.setSeconds(0, 0)
t.setMinutes(t.getMinutes() + 1)
const maxIter = 366 * 24 * 60
for (let i = 0; i < maxIter; i++) {
const month = t.getMonth() + 1
if (!monthSet.has(month)) {
// Jump to start of next month
t.setMonth(t.getMonth() + 1, 1)
t.setHours(0, 0, 0, 0)
continue
}
const dom = t.getDate()
const dow = t.getDay()
// When both dom/dow are constrained, either match is sufficient (OR semantics)
const dayMatches =
domWild && dowWild
? true
: domWild
? dowSet.has(dow)
: dowWild
? domSet.has(dom)
: domSet.has(dom) || dowSet.has(dow)
if (!dayMatches) {
// Jump to start of next day
t.setDate(t.getDate() + 1)
t.setHours(0, 0, 0, 0)
continue
}
if (!hourSet.has(t.getHours())) {
t.setHours(t.getHours() + 1, 0, 0, 0)
continue
}
if (!minuteSet.has(t.getMinutes())) {
t.setMinutes(t.getMinutes() + 1)
continue
}
return t
}
return null
}
// --- cronToHuman ------------------------------------------------------------
// Intentionally narrow: covers common patterns; falls through to the raw cron
// string for anything else. The `utc` option exists for CCR remote triggers
// (agents-platform.tsx), which run on servers and always use UTC cron strings
// — that path translates UTC→local for display and needs midnight-crossing
// logic for the weekday case. Local scheduled tasks (the default) need neither.
const DAY_NAMES = [
'Sunday',
'Monday',
'Tuesday',
'Wednesday',
'Thursday',
'Friday',
'Saturday',
]
function formatLocalTime(minute: number, hour: number): string {
// January 1 — no DST gap anywhere. Using `new Date()` (today) would roll
// 2am→3am on the one spring-forward day per year.
const d = new Date(2000, 0, 1, hour, minute)
return d.toLocaleTimeString('en-US', { hour: 'numeric', minute: '2-digit' })
}
function formatUtcTimeAsLocal(minute: number, hour: number): string {
// Create a date in UTC and format in user's local timezone
const d = new Date()
d.setUTCHours(hour, minute, 0, 0)
return d.toLocaleTimeString('en-US', {
hour: 'numeric',
minute: '2-digit',
timeZoneName: 'short',
})
}
export function cronToHuman(cron: string, opts?: { utc?: boolean }): string {
const utc = opts?.utc ?? false
const parts = cron.trim().split(/\s+/)
if (parts.length !== 5) return cron
const [minute, hour, dayOfMonth, month, dayOfWeek] = parts as [
string,
string,
string,
string,
string,
]
// Every N minutes: step/N * * * *
const everyMinMatch = minute.match(/^\*\/(\d+)$/)
if (
everyMinMatch &&
hour === '*' &&
dayOfMonth === '*' &&
month === '*' &&
dayOfWeek === '*'
) {
const n = parseInt(everyMinMatch[1]!, 10)
return n === 1 ? 'Every minute' : `Every ${n} minutes`
}
// Every hour: 0 * * * *
if (
minute.match(/^\d+$/) &&
hour === '*' &&
dayOfMonth === '*' &&
month === '*' &&
dayOfWeek === '*'
) {
const m = parseInt(minute, 10)
if (m === 0) return 'Every hour'
return `Every hour at :${m.toString().padStart(2, '0')}`
}
// Every N hours: 0 step/N * * *
const everyHourMatch = hour.match(/^\*\/(\d+)$/)
if (
minute.match(/^\d+$/) &&
everyHourMatch &&
dayOfMonth === '*' &&
month === '*' &&
dayOfWeek === '*'
) {
const n = parseInt(everyHourMatch[1]!, 10)
const m = parseInt(minute, 10)
const suffix = m === 0 ? '' : ` at :${m.toString().padStart(2, '0')}`
return n === 1 ? `Every hour${suffix}` : `Every ${n} hours${suffix}`
}
// --- Remaining cases reference hour+minute: branch on utc ----------------
if (!minute.match(/^\d+$/) || !hour.match(/^\d+$/)) return cron
const m = parseInt(minute, 10)
const h = parseInt(hour, 10)
const fmtTime = utc ? formatUtcTimeAsLocal : formatLocalTime
// Daily at specific time: M H * * *
if (dayOfMonth === '*' && month === '*' && dayOfWeek === '*') {
return `Every day at ${fmtTime(m, h)}`
}
// Specific day of week: M H * * D
if (dayOfMonth === '*' && month === '*' && dayOfWeek.match(/^\d$/)) {
const dayIndex = parseInt(dayOfWeek, 10) % 7 // normalize 7 (Sunday alias) -> 0
let dayName: string | undefined
if (utc) {
// UTC day+time may land on a different local day (midnight crossing).
// Compute the actual local weekday by constructing the UTC instant.
const ref = new Date()
const daysToAdd = (dayIndex - ref.getUTCDay() + 7) % 7
ref.setUTCDate(ref.getUTCDate() + daysToAdd)
ref.setUTCHours(h, m, 0, 0)
dayName = DAY_NAMES[ref.getDay()]
} else {
dayName = DAY_NAMES[dayIndex]
}
if (dayName) return `Every ${dayName} at ${fmtTime(m, h)}`
}
// Weekdays: M H * * 1-5
if (dayOfMonth === '*' && month === '*' && dayOfWeek === '1-5') {
return `Weekdays at ${fmtTime(m, h)}`
}
return cron
}