Added support for x-y syntax

cron
Jef Roosens 2022-04-12 10:35:29 +02:00
parent f4bb03f488
commit 2942793f40
Signed by untrusted user: Jef Roosens
GPG Key ID: B75D4F293C7052DB
3 changed files with 70 additions and 22 deletions

View File

@ -29,7 +29,7 @@ pub fn cron(conf Config) ? {
// println(queue)
// exp := '10/2 5 *'
// println(parse_expression(exp) ?)
ce := parse_expression('0 3 */2') ?
ce := parse_expression('0 35 */2') ?
println(ce)
// ce := CronExpression{
// minutes: [0]

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@ -118,17 +118,28 @@ fn (ce &CronExpression) next_from_now() ?time.Time {
// possible.
fn parse_range(s string, min int, max int, mut bitv []bool) ? {
mut start := min
mut end := max
mut interval := 1
exps := s.split('/')
if exps.len > 2 {
return error('Invalid expression.')
}
if exps[0] != '*' {
start = exps[0].int()
dash_parts := exps[0].split('-')
if dash_parts.len > 2 {
return error('Invalid expression.')
}
start = dash_parts[0].int()
// The builtin parsing functions return zero if the string can't be
// parsed into a number, so we have to explicitely check whether they
// actually entered zero or if it's an invalid number.
if start == 0 && exps[0] != '0' {
if start == 0 && dash_parts[0] != '0' {
return error('Invalid number.')
}
@ -136,6 +147,18 @@ fn parse_range(s string, min int, max int, mut bitv []bool) ? {
if start < min || start > max {
return error('Out of range.')
}
if dash_parts.len == 2 {
end = dash_parts[1].int()
if end == 0 && dash_parts[1] != '0' {
return error('Invalid number.')
}
if end < start || end > max {
return error('Out of range.')
}
}
}
if exps.len > 1 {
@ -146,7 +169,7 @@ fn parse_range(s string, min int, max int, mut bitv []bool) ? {
if interval == 0 {
if exps[1] != '0' {
return error('Invalid number.')
}else{
} else {
return error('Step size zero not allowed.')
}
}
@ -157,12 +180,12 @@ fn parse_range(s string, min int, max int, mut bitv []bool) ? {
}
// Here, s solely consists of a number, so that's the only value we
// should return.
else if exps[0] != '*' {
else if exps[0] != '*' && !exps[0].contains('-') {
bitv[start - min] = true
return
}
for start <= max {
for start <= end {
bitv[start - min] = true
start += interval
}
@ -171,7 +194,7 @@ fn parse_range(s string, min int, max int, mut bitv []bool) ? {
fn bitv_to_ints(bitv []bool, min int) []int {
mut out := []int{}
for i in 0..bitv.len {
for i in 0 .. bitv.len {
if bitv[i] {
out << min + i
}
@ -181,7 +204,7 @@ fn bitv_to_ints(bitv []bool, min int) []int {
}
fn parse_part(s string, min int, max int) ?[]int {
mut bitv := []bool{init: false, len: max - min + 1}
mut bitv := []bool{len: max - min + 1, init: false}
for range in s.split(',') {
parse_range(range, min, max, mut bitv) ?
@ -190,7 +213,8 @@ fn parse_part(s string, min int, max int) ?[]int {
return bitv_to_ints(bitv, min)
}
// min hour day month day-of-week
// parse_expression parses an entire cron expression string into a
// CronExpression object, if possible.
fn parse_expression(exp string) ?CronExpression {
// The filter allows for multiple spaces between parts
mut parts := exp.split(' ').filter(it != '')
@ -205,10 +229,22 @@ fn parse_expression(exp string) ?CronExpression {
parts << '*'
}
mut part_results := [][]int{}
mins := [0, 0, 1, 1]
maxs := [59, 23, 31, 12]
// This for loop allows us to more clearly propagate the error to the user.
for i, min in mins {
part_results << parse_part(parts[i], min, maxs[i]) or {
return error('An error occurred with part $i: $err.msg')
}
}
return CronExpression{
minutes: parse_part(parts[0], 0, 59) ?
hours: parse_part(parts[1], 0, 23) ?
days: parse_part(parts[2], 1, 31) ?
months: parse_part(parts[3], 1, 12) ?
minutes: part_results[0]
hours: part_results[1]
days: part_results[2]
months: part_results[3]
}
}

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@ -3,25 +3,23 @@ module cron
// parse_range_error returns the returned error message. If the result is '',
// that means the function didn't error.
fn parse_range_error(s string, min int, max int) string {
mut bitv := []bool{init: false, len: max - min + 1}
mut bitv := []bool{len: max - min + 1, init: false}
parse_range(s, min, max, mut bitv) or {
return err.msg
}
parse_range(s, min, max, mut bitv) or { return err.msg }
return ''
}
// =====parse_range=====
fn test_range_star_range() ? {
mut bitv := []bool{init: false, len: 6}
mut bitv := []bool{len: 6, init: false}
parse_range('*', 0, 5, mut bitv) ?
assert bitv == [true, true, true, true, true, true]
}
fn test_range_number() ? {
mut bitv := []bool{init: false, len: 6}
mut bitv := []bool{len: 6, init: false}
parse_range('4', 0, 5, mut bitv) ?
assert bitv_to_ints(bitv, 0) == [4]
@ -40,14 +38,14 @@ fn test_range_number_invalid() ? {
}
fn test_range_step_star_1() ? {
mut bitv := []bool{init: false, len: 21}
mut bitv := []bool{len: 21, init: false}
parse_range('*/4', 0, 20, mut bitv) ?
assert bitv_to_ints(bitv, 0) == [0, 4, 8, 12, 16, 20]
}
fn test_range_step_star_2() ? {
mut bitv := []bool{init: false, len: 9}
mut bitv := []bool{len: 8, init: false}
parse_range('*/3', 1, 8, mut bitv) ?
assert bitv_to_ints(bitv, 1) == [1, 4, 7]
@ -62,7 +60,7 @@ fn test_range_step_zero() ? {
}
fn test_range_step_number() ? {
mut bitv := []bool{init: false, len: 21}
mut bitv := []bool{len: 21, init: false}
parse_range('5/4', 2, 22, mut bitv) ?
assert bitv_to_ints(bitv, 2) == [5, 9, 13, 17, 21]
@ -76,6 +74,20 @@ fn test_range_step_number_too_small() ? {
assert parse_range_error('2/4', 5, 10) == 'Out of range.'
}
fn test_range_dash() ? {
mut bitv := []bool{len: 10, init: false}
parse_range('4-8', 0, 9, mut bitv) ?
assert bitv_to_ints(bitv, 0) == [4, 5, 6, 7, 8]
}
fn test_range_dash_step() ? {
mut bitv := []bool{len: 10, init: false}
parse_range('4-8/2', 0, 9, mut bitv) ?
assert bitv_to_ints(bitv, 0) == [4, 6, 8]
}
// =====parse_part=====
fn test_part_single() ? {
assert parse_part('*', 0, 5) ? == [0, 1, 2, 3, 4, 5]