krontab/src/commonMain/kotlin/dev/inmo/krontab/StringParser.kt

102 lines
3.3 KiB
Kotlin

package dev.inmo.krontab
import dev.inmo.krontab.internal.*
/**
* @see createSimpleScheduler
* @see buildSchedule
*/
typealias KrontabTemplate = String
/**
* Parse [incoming] string and adapt according to next format: "* * * * *" where order of things:
*
* * seconds
* * minutes
* * hours
* * dayOfMonth
* * month
* * (optional) year
* * (optional) (can be placed before year) offset
*
* And each one have next format:
*
* `{number}[,{number},...]` or `*`
*
* and {number} here is one of
*
* * {int}-{int}
* * {int}/{int}
* * */{int}
* * {int}
* * F
* * L
*
* Additional info about ranges can be found in follow accordance:
*
* * Seconds ranges can be found in [secondsRange]
* * Minutes ranges can be found in [minutesRange]
* * Hours ranges can be found in [hoursRange]
* * Days of month ranges can be found in [dayOfMonthRange]
* * Months ranges can be found in [monthRange]
* * Years ranges can be found in [yearRange] (in fact - any [Int])
* * Offset (timezone) ranges can be found in [offsetRange]
*
* Examples:
*
* * "0/5 * * * *" for every five seconds triggering
* * "0/5,L * * * *" for every five seconds triggering and on 59 second
* * "0/15 30 * * *" for every 15th seconds in a half of each hour
* * "1 2 3 F,4,L 5" for triggering in near first second of second minute of third hour of fourth day of may
* * "1 2 3 F,4,L 5 60o" for triggering in near first second of second minute of third hour of fourth day of may with timezone UTC+01:00
* * "1 2 3 F,4,L 5 2021" for triggering in near first second of second minute of third hour of fourth day of may of 2021st year
* * "1 2 3 F,4,L 5 2021 60o" for triggering in near first second of second minute of third hour of fourth day of may of 2021st year with timezone UTC+01:00
*
* @see dev.inmo.krontab.internal.createKronScheduler
*/
fun createSimpleScheduler(incoming: KrontabTemplate): KronScheduler {
var offsetParsed: Int? = null
var yearParsed: Array<Int>? = null
val (secondsSource, minutesSource, hoursSource, dayOfMonthSource, monthSource) = incoming.split(" ").also {
listOfNotNull(
it.getOrNull(5),
it.getOrNull(6)
).forEach {
val parsedOffset = parseOffset(it)
offsetParsed = offsetParsed ?: parsedOffset
when {
parsedOffset == null && yearParsed == null -> {
yearParsed = parseYears(it)
}
parsedOffset != null && offsetParsed == null -> {
offsetParsed = parsedOffset
}
}
}
}
val secondsParsed = parseSeconds(secondsSource)
val minutesParsed = parseMinutes(minutesSource)
val hoursParsed = parseHours(hoursSource)
val dayOfMonthParsed = parseDaysOfMonth(dayOfMonthSource)
val monthParsed = parseMonths(monthSource)
return createKronScheduler(
secondsParsed, minutesParsed, hoursParsed, dayOfMonthParsed, monthParsed, yearParsed, offsetParsed
)
}
/**
* Shortcut for [createSimpleScheduler]
*/
fun buildSchedule(incoming: KrontabTemplate): KronScheduler = createSimpleScheduler(incoming)
/**
* Shortcut for [buildSchedule]
*/
fun KrontabTemplate.toSchedule(): KronScheduler = buildSchedule(this)
/**
* Shortcut for [buildSchedule]
*/
fun KrontabTemplate.toKronScheduler(): KronScheduler = buildSchedule(this)