core: Implement ASCII trim functions on byte slices #93686

dbrgn · 2022-02-06T01:34:01Z

Hi @rust-lang/libs! This is a feature that I wished for when implementing serial protocols with microcontrollers. Often these protocols may contain leading or trailing whitespace, which needs to be removed. Because oftentimes drivers will operate on the byte level, decoding to unicode and checking for unicode whitespace is unnecessary overhead.

This PR adds three new methods to byte slices:

trim_ascii_start
trim_ascii_end
trim_ascii

I did not find any pre-existing discussions about this, which surprises me a bit. Maybe I'm missing something, and this functionality is already possible through other means? There's rust-lang/rfcs#2547 ("Trim methods on slices"), but that has a different purpose.

As per the std dev guide, this is a proposed implementation without any issue / RFC. If this is the wrong process, please let me know. However, I thought discussing code is easier than discussing a mere idea, and hacking on the stdlib was fun.

Tracking issue: #94035

rust-highfive · 2022-02-06T01:34:05Z

r? @yaahc

(rust-highfive has picked a reviewer for you, use r? to override)

library/core/src/slice/ascii.rs

leonardo-m · 2022-02-06T12:13:35Z

Some more ASCII functions could be useful. There are probably crates to do this, but I think such functions are commonly desired, simple, there are probably very few ways to implement them, and they aren't going to change much if they are well designed. So I think they could qualify for the stdlib.

joshtriplett · 2022-02-09T05:03:42Z

Seems reasonable to me. r=me with the fixup commits squashed and CI passing.

dbrgn · 2022-02-09T14:55:19Z

Great, commits are now squashed!

Is there a way to solve this rustdoc linking issue?

std/io/struct.IoSlice.html:845: broken link - `std/io/primitive.u8.html`
std/io/struct.IoSlice.html:854: broken link - `std/io/primitive.u8.html`
std/io/struct.IoSlice.html:864: broken link - `std/io/primitive.u8.html`
std/io/struct.IoSliceMut.html:1829: broken link - `std/io/primitive.u8.html`
std/io/struct.IoSliceMut.html:1838: broken link - `std/io/primitive.u8.html`
std/io/struct.IoSliceMut.html:1848: broken link - `std/io/primitive.u8.html`
std/vec/struct.Vec.html:2801: broken link - `std/vec/primitive.u8.html`
std/vec/struct.Vec.html:2810: broken link - `std/vec/primitive.u8.html`
std/vec/struct.Vec.html:2820: broken link - `std/vec/primitive.u8.html`

This is the link: [u8::is_ascii_whitespace]: primitive.u8.html#method.is_ascii_whitespace. It works fine in the slice docs, but not when re-exported into the Vec docs.

dbrgn · 2022-02-10T12:59:41Z

For now, I removed the links from the docs. It reduces user-friendliness a bit, but at least the links aren't broken in some parts of the docs. (Here's the diff.) This should get CI passing.

dbrgn · 2022-02-10T13:48:52Z

r? @joshtriplett

library/core/src/slice/ascii.rs

workingjubilee · 2022-02-12T04:39:40Z

As this looks like the answer is "looks good", please open a tracking issue for this proposed set of methods and point to that in the #[unstable] annotation.

dbrgn · 2022-02-15T23:29:08Z

Tracking issue is here: #94035

Unstable annotations have been updated: diff
Functions are now const using the implementation suggested by @workingjubilee: diff

Co-authored-by: Jubilee Young <workingjubilee@gmail.com>

workingjubilee · 2022-02-17T23:42:52Z

Thank you!

Then with that point of bureaucracy formalized, it looks like this has been approved, so!
@bors r=joshtriplett rollup

bors · 2022-02-17T23:42:53Z

📌 Commit f7448a7 has been approved by joshtriplett

…iplett core: Implement ASCII trim functions on byte slices Hi `@rust-lang/libs!` This is a feature that I wished for when implementing serial protocols with microcontrollers. Often these protocols may contain leading or trailing whitespace, which needs to be removed. Because oftentimes drivers will operate on the byte level, decoding to unicode and checking for unicode whitespace is unnecessary overhead. This PR adds three new methods to byte slices: - `trim_ascii_start` - `trim_ascii_end` - `trim_ascii` I did not find any pre-existing discussions about this, which surprises me a bit. Maybe I'm missing something, and this functionality is already possible through other means? There's rust-lang/rfcs#2547 ("Trim methods on slices"), but that has a different purpose. As per the [std dev guide](https://std-dev-guide.rust-lang.org/feature-lifecycle/new-unstable-features.html), this is a proposed implementation without any issue / RFC. If this is the wrong process, please let me know. However, I thought discussing code is easier than discussing a mere idea, and hacking on the stdlib was fun. Tracking issue: rust-lang#94035

…iplett core: Implement ASCII trim functions on byte slices Hi ``@rust-lang/libs!`` This is a feature that I wished for when implementing serial protocols with microcontrollers. Often these protocols may contain leading or trailing whitespace, which needs to be removed. Because oftentimes drivers will operate on the byte level, decoding to unicode and checking for unicode whitespace is unnecessary overhead. This PR adds three new methods to byte slices: - `trim_ascii_start` - `trim_ascii_end` - `trim_ascii` I did not find any pre-existing discussions about this, which surprises me a bit. Maybe I'm missing something, and this functionality is already possible through other means? There's rust-lang/rfcs#2547 ("Trim methods on slices"), but that has a different purpose. As per the [std dev guide](https://std-dev-guide.rust-lang.org/feature-lifecycle/new-unstable-features.html), this is a proposed implementation without any issue / RFC. If this is the wrong process, please let me know. However, I thought discussing code is easier than discussing a mere idea, and hacking on the stdlib was fun. Tracking issue: rust-lang#94035

…iplett core: Implement ASCII trim functions on byte slices Hi ```@rust-lang/libs!``` This is a feature that I wished for when implementing serial protocols with microcontrollers. Often these protocols may contain leading or trailing whitespace, which needs to be removed. Because oftentimes drivers will operate on the byte level, decoding to unicode and checking for unicode whitespace is unnecessary overhead. This PR adds three new methods to byte slices: - `trim_ascii_start` - `trim_ascii_end` - `trim_ascii` I did not find any pre-existing discussions about this, which surprises me a bit. Maybe I'm missing something, and this functionality is already possible through other means? There's rust-lang/rfcs#2547 ("Trim methods on slices"), but that has a different purpose. As per the [std dev guide](https://std-dev-guide.rust-lang.org/feature-lifecycle/new-unstable-features.html), this is a proposed implementation without any issue / RFC. If this is the wrong process, please let me know. However, I thought discussing code is easier than discussing a mere idea, and hacking on the stdlib was fun. Tracking issue: rust-lang#94035

…iplett core: Implement ASCII trim functions on byte slices Hi ````@rust-lang/libs!```` This is a feature that I wished for when implementing serial protocols with microcontrollers. Often these protocols may contain leading or trailing whitespace, which needs to be removed. Because oftentimes drivers will operate on the byte level, decoding to unicode and checking for unicode whitespace is unnecessary overhead. This PR adds three new methods to byte slices: - `trim_ascii_start` - `trim_ascii_end` - `trim_ascii` I did not find any pre-existing discussions about this, which surprises me a bit. Maybe I'm missing something, and this functionality is already possible through other means? There's rust-lang/rfcs#2547 ("Trim methods on slices"), but that has a different purpose. As per the [std dev guide](https://std-dev-guide.rust-lang.org/feature-lifecycle/new-unstable-features.html), this is a proposed implementation without any issue / RFC. If this is the wrong process, please let me know. However, I thought discussing code is easier than discussing a mere idea, and hacking on the stdlib was fun. Tracking issue: rust-lang#94035

…iplett core: Implement ASCII trim functions on byte slices Hi `````@rust-lang/libs!````` This is a feature that I wished for when implementing serial protocols with microcontrollers. Often these protocols may contain leading or trailing whitespace, which needs to be removed. Because oftentimes drivers will operate on the byte level, decoding to unicode and checking for unicode whitespace is unnecessary overhead. This PR adds three new methods to byte slices: - `trim_ascii_start` - `trim_ascii_end` - `trim_ascii` I did not find any pre-existing discussions about this, which surprises me a bit. Maybe I'm missing something, and this functionality is already possible through other means? There's rust-lang/rfcs#2547 ("Trim methods on slices"), but that has a different purpose. As per the [std dev guide](https://std-dev-guide.rust-lang.org/feature-lifecycle/new-unstable-features.html), this is a proposed implementation without any issue / RFC. If this is the wrong process, please let me know. However, I thought discussing code is easier than discussing a mere idea, and hacking on the stdlib was fun. Tracking issue: rust-lang#94035

…iplett core: Implement ASCII trim functions on byte slices Hi ``````@rust-lang/libs!`````` This is a feature that I wished for when implementing serial protocols with microcontrollers. Often these protocols may contain leading or trailing whitespace, which needs to be removed. Because oftentimes drivers will operate on the byte level, decoding to unicode and checking for unicode whitespace is unnecessary overhead. This PR adds three new methods to byte slices: - `trim_ascii_start` - `trim_ascii_end` - `trim_ascii` I did not find any pre-existing discussions about this, which surprises me a bit. Maybe I'm missing something, and this functionality is already possible through other means? There's rust-lang/rfcs#2547 ("Trim methods on slices"), but that has a different purpose. As per the [std dev guide](https://std-dev-guide.rust-lang.org/feature-lifecycle/new-unstable-features.html), this is a proposed implementation without any issue / RFC. If this is the wrong process, please let me know. However, I thought discussing code is easier than discussing a mere idea, and hacking on the stdlib was fun. Tracking issue: rust-lang#94035

…iplett core: Implement ASCII trim functions on byte slices Hi ```````@rust-lang/libs!``````` This is a feature that I wished for when implementing serial protocols with microcontrollers. Often these protocols may contain leading or trailing whitespace, which needs to be removed. Because oftentimes drivers will operate on the byte level, decoding to unicode and checking for unicode whitespace is unnecessary overhead. This PR adds three new methods to byte slices: - `trim_ascii_start` - `trim_ascii_end` - `trim_ascii` I did not find any pre-existing discussions about this, which surprises me a bit. Maybe I'm missing something, and this functionality is already possible through other means? There's rust-lang/rfcs#2547 ("Trim methods on slices"), but that has a different purpose. As per the [std dev guide](https://std-dev-guide.rust-lang.org/feature-lifecycle/new-unstable-features.html), this is a proposed implementation without any issue / RFC. If this is the wrong process, please let me know. However, I thought discussing code is easier than discussing a mere idea, and hacking on the stdlib was fun. Tracking issue: rust-lang#94035

…askrgr Rollup of 14 pull requests Successful merges: - rust-lang#93580 (Stabilize pin_static_ref.) - rust-lang#93639 (Release notes for 1.59) - rust-lang#93686 (core: Implement ASCII trim functions on byte slices) - rust-lang#94002 (rustdoc: Avoid duplicating macros in sidebar) - rust-lang#94019 (removing architecture requirements for RustyHermit) - rust-lang#94023 (adapt static-nobundle test to use llvm-nm) - rust-lang#94091 (Fix rustdoc const computed value) - rust-lang#94093 (Fix pretty printing of enums without variants) - rust-lang#94097 (Add module-level docs for `rustc_middle::query`) - rust-lang#94112 (Optimize char_try_from_u32) - rust-lang#94113 (document rustc_middle::mir::Field) - rust-lang#94122 (Fix miniz_oxide types showing up in std docs) - rust-lang#94142 (rustc_typeck: adopt let else in more places) - rust-lang#94146 (Adopt let else in more places) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup

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dbrgn force-pushed the trim-on-byte-slices branch 2 times, most recently from d10e41c to 5f08b29 Compare February 10, 2022 12:58

rust-highfive assigned joshtriplett and unassigned yaahc Feb 10, 2022

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dbrgn mentioned this pull request Feb 15, 2022

Tracking Issue for ASCII trim functions on byte slices #94035

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dbrgn force-pushed the trim-on-byte-slices branch 2 times, most recently from c12401f to 08f80df Compare February 15, 2022 23:28

core: Implement trim functions on byte slices

f7448a7

Co-authored-by: Jubilee Young <workingjubilee@gmail.com>

dbrgn force-pushed the trim-on-byte-slices branch from 08f80df to f7448a7 Compare February 17, 2022 20:20

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Feb 17, 2022

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Rollup of 4 pull requests #94120

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Rollup of 9 pull requests #94151

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bors merged commit 575f6c5 into rust-lang:master Feb 20, 2022

rustbot added this to the 1.61.0 milestone Feb 20, 2022

dbrgn deleted the trim-on-byte-slices branch March 7, 2022 08:24

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