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Add proc_macro::Span::{before, after}. #86165

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merged 2 commits into from
Sep 11, 2021
Merged

Add proc_macro::Span::{before, after}. #86165

merged 2 commits into from
Sep 11, 2021

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m-ou-se
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@m-ou-se m-ou-se commented Jun 9, 2021 •
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This adds proc_macro::Span::before() and proc_macro::Span::after() to get a zero width span at the start or end of the span.

These are equivalent to rustc's Span::shrink_to_lo() and Span::shrink_to_hi() but with a less cryptic name. They are useful when generating diagnostlics like "missing <thing> after <thing>".

E.g.

syn::Error::new(ident.span().after(), "missing `:` after field name").into_compile_error()

@m-ou-se m-ou-se added T-libs-api Relevant to the library API team, which will review and decide on the PR/issue. A-proc-macros Area: Procedural macros labels Jun 9, 2021
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r? @petrochenkov

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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jun 9, 2021
m-ou-se
m-ou-se commented Jun 9, 2021
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jhpratt commented Jun 13, 2021

Part of me would prefer this be called start and end, but those names are already (unstably) taken.

Would it makes sense to repurpose these names and provide a generalized .location() method that would return the LineColumn? Presumably it could point to the start of the span. Alternatively .start_location() and .end_location() could be provided.

Just a random thought I had from a usability perspective; I could certainly get accustomed to the before/after naming.

@JohnCSimon JohnCSimon added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jul 5, 2021
@joelpalmer joelpalmer added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jul 20, 2021
@m-ou-se m-ou-se mentioned this pull request Jul 28, 2021
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m-ou-se commented Jul 28, 2021

@jhpratt Since a span is not a point/location but a range, calling it start and end doesn't feel entirely accurate to me.

@JohnCSimon JohnCSimon added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Aug 15, 2021
@JohnCSimon JohnCSimon added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Sep 6, 2021
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m-ou-se commented Sep 8, 2021

r? @dtolnay

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This API looks good to me as implemented.

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dtolnay commented Sep 9, 2021

@bors r+

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bors commented Sep 9, 2021

📌 Commit f9be6cd has been approved by dtolnay

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bors commented Sep 9, 2021

🌲 The tree is currently closed for pull requests below priority 100. This pull request will be tested once the tree is reopened.

@bors 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 Sep 9, 2021
@Manishearth Manishearth mentioned this pull request Sep 10, 2021
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bors added a commit to rust-lang-ci/rust that referenced this pull request Sep 11, 2021
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Auto merge of rust-lang#88824 - Manishearth:rollup-7bzk9h6, r=Manishe…
22719ef 
…arth

Rollup of 15 pull requests

Successful merges:

 - rust-lang#85200 (Ignore derived Clone and Debug implementations during dead code analysis)
 - rust-lang#86165 (Add proc_macro::Span::{before, after}.)
 - rust-lang#87088 (Fix stray notes when the source code is not available)
 - rust-lang#87441 (Emit suggestion when passing byte literal to format macro)
 - rust-lang#88546 (Emit proper errors when on missing closure braces)
 - rust-lang#88578 (fix(rustc): suggest `items` be borrowed in `for i in items[x..]`)
 - rust-lang#88632 (Fix issues with Markdown summary options)
 - rust-lang#88639 (rustdoc: Fix ICE with `doc(hidden)` on tuple variant fields)
 - rust-lang#88667 (Tweak `write_fmt` doc.)
 - rust-lang#88720 (Rustdoc coverage fields count)
 - rust-lang#88732 (RustWrapper: avoid deleted unclear attribute methods)
 - rust-lang#88742 (Fix table in docblocks)
 - rust-lang#88776 (Workaround blink/chromium grid layout limitation of 1000 rows)
 - rust-lang#88807 (Fix typo in docs for iterators)
 - rust-lang#88812 (Fix typo `option` -> `options`.)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 000dbd2 into rust-lang:master Sep 11, 2021
@rustbot rustbot added this to the 1.57.0 milestone Sep 11, 2021
@m-ou-se m-ou-se deleted the proc-macro-span-shrink branch September 11, 2021 10:01
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@dtolnay dtolnay dtolnay approved these changes

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A-proc-macros Area: Procedural macros S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
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