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Author SHA1 Message Date
Oleg Zaytsev c8bce5d8c5
When cleaning up the only element, make a nop. 
We can't remove the only Sub from regexp, since the contract for some
operations says that there's at least one Sub, like OpStar or OpPlus.

In order to convert a single-sub element into a no-op, we change the
operation to OpEmptyString.

Signed-off-by: Oleg Zaytsev <mail@olegzaytsev.com>
 2022-05-17 17:49:19 +02:00
Jesus Vazquez 48aa5cd096 Merge remote-tracking branch 'upstream/main' into jvp/merge-prometheus-main 2022-04-12 16:40:00 +02:00
Bryan Boreham 579331446a
Allow downstream projects to use faster regexp (#10251) 
* Add benchmark for FastRegexMatcher

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>

* Use modified regexp package with optimisations

See https://github.com/grafana/regexp/tree/speedup#readme

Includes the following changes proposed upstream:
* [regexp: allow patterns with no alternates to be one-pass](https://go-review.googlesource.com/c/go/+/353711)
* [regexp: speed up onepass prefix check](https://go-review.googlesource.com/c/go/+/354909)
* [regexp: handle prefix string with fold-case](https://go-review.googlesource.com/c/go/+/358756)
* [regexp: avoid copying each instruction executed](https://go-review.googlesource.com/c/go/+/355789)
* [regexp: allow prefix string anchored at beginning](https://go-review.googlesource.com/c/go/+/377294)

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>

* Use regexp code identical to upstream Go

Change `grafana/regexp` import to use `main` branch.

This means Prometheus is not using the proposed optimisations, but
downstream users of Prometheus code are able to `replace` the library
with the `speedup` branch which does.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
 2022-02-08 11:03:20 +01:00
Peter Štibraný 294c155bb6 Merge remote-tracking branch 'upstream/main' into merge-upstream 2021-11-18 15:48:40 +01:00
beorn7 c954cd9d1d Move packages out of deprecated pkg directory 
This creates a new `model` directory and moves all data-model related
packages over there:
  exemplar labels relabel rulefmt textparse timestamp value

All the others are more or less utilities and have been moved to `util`:
  gate logging modetimevfs pool runtime

Signed-off-by: beorn7 <beorn@grafana.com>
 2021-11-09 08:03:10 +01:00
Renamed from pkg/labels/regexp.go (Browse further)