https://github.com/influxdata/cron

A fast, zero-allocation cron parser in ragel and golang
https://github.com/influxdata/cron

Last synced: about 2 months ago
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A fast, zero-allocation cron parser in ragel and golang

• Host: GitHub
• URL: https://github.com/influxdata/cron
• Owner: influxdata
• License: mit
• Created: 2019-07-15T17:49:43.000Z (almost 6 years ago)
• Default Branch: master
• Last Pushed: 2020-10-06T13:25:36.000Z (over 4 years ago)
• Last Synced: 2025-03-24T22:41:38.312Z (3 months ago)
• Language: Go
• Homepage:
• Size: 260 KB
• Stars: 22
• Watchers: 45
• Forks: 5
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# cron

A fast non-allocating cron parser in ragel and golang.

# features

- [x] standard five-position cron

- [x] six-position cron with seconds

- [x] seven-position cron with seconds and years

- [x] case-insensitive days of the week

- [x] case-insensitive month names

- [x] [Quartz](http://www.quartz-scheduler.org) compatible ranges e.g.: `4/10`, `SUN-THURS/2`

- [ ] timezone handling (other than UTC)

- [ ] Quartz compatible # handling, i.e. `5#3` meaning the third friday of the month

- [ ] Quartz compatible L handling, i.e. `5L` in the day of week field meaning the last friday of a month, or `3L` in the day of month field meaning third to last day of the month

# performance

On a 3.1 Ghz Core i7 MacBook Pro (Retina, 15-inch, Mid 2017):

| | | | |

|-|-|-|-|

| `BenchmarkParse/0_*_*_*_*_*_*-8` | 20000000 |  63.5 ns/op |  0 B/op | 0 allocs/op |

| `BenchmarkParse/1-6/2_*_*_*_Feb-Oct/3_*_*-8` | 10000000 |  118  ns/op |  0 B/op | 0 allocs/op |

| `BenchmarkParse/1-6/2_*_*_*_Feb-Oct/3_*_2020/4-8` |  1000000 |  146 ns/op |  0 B/op | 0 allocs/op |

# TODO

- Once we are done adding all of the Quartz cron features, to copy and pass all of Quartz's parsing tests.