Improve parser #125117

dev-ardi · 2024-05-14T11:21:16Z

Add a few more help diagnostics to incorrect semicolons
Overall improved that function
Addded a few comments
Renamed diff_marker fns to git_diff_marker

rustbot · 2024-05-14T11:21:23Z

rustbot has assigned @wesleywiser.
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wesleywiser · 2024-05-14T15:31:09Z

Nice improvements!

@bors r+ rollup

bors · 2024-05-14T15:31:12Z

📌 Commit bee186b has been approved by wesleywiser

It is now in the queue for this repository.

compiler/rustc_parse/src/parser/diagnostics.rs

compiler/rustc_parse/src/parser/item.rs

fmease · 2024-05-14T15:45:21Z

compiler/rustc_parse/src/parser/diagnostics.rs

        (0..3).all(|i| self.look_ahead(i, |tok| tok == long_kind))
            && self.look_ahead(3, |tok| tok == short_kind)
    }

-    fn diff_marker(&mut self, long_kind: &TokenKind, short_kind: &TokenKind) -> Option<Span> {
-        if self.is_diff_marker(long_kind, short_kind) {
+    fn git_diff_marker(&mut self, long_kind: &TokenKind, short_kind: &TokenKind) -> Option<Span> {


If I remember correctly it was intentional to not mention git here. I'd need to look for the original PRs. CC @estebank

Indeed, diff markers are used by git, but not exclusive to it.

fmease · 2024-05-14T15:46:03Z

Sorry but the markdown docs are butchered.
@bors r-

dev-ardi · 2024-05-14T16:13:58Z

Thanks for noticing!

@rustbot ready

fmease · 2024-05-14T16:34:23Z

Thanks. One last thing, could you squash the commits into one?

dev-ardi · 2024-05-14T16:42:16Z

All of them or just the "applied suggestions" one? If all with what name?

fmease · 2024-05-14T16:55:55Z

Eh, I guess git-fixup the “apply suggs” commit into 9db789a should be fine

dev-ardi · 2024-05-14T21:09:25Z

@rustbot ready
About the git marker, what would be the reason not to include it in the name?

fmease · 2024-05-15T12:51:07Z

About the git marker, what would be the reason not to include it in the name?

As far as I'm aware, conflict markers (the >>>, ===, |||, <<<) are not specific to git but I'm sure about the specifics. Other VCSs also use them like SVN and Mercurial. I could be wrong but GNU's diff3 (three-way "merges") also produce them, not sure about GNU's diff (both from diffutils).

I think now might be the best time to rename [git] diff marker to conflict markers which is the more appropriate term as touched upon in #113826. If you could do that in this PR, that would be great!

Diff markers are +++, ---, @@, +, - and they come from the patch file format.

dev-ardi · 2024-05-15T14:04:57Z

Maybe vcs_conflict_marker then?

fmease · 2024-05-15T20:00:31Z

Maybe vcs_conflict_marker then?

I guess that's fine, yes. From a purist / theoretical point of view, these conflict markers not necessarily tied to VCSs but to be fair, in practice, that shouldn't matter. CC https://www.gnu.org/software/diffutils/, https://www.geeksforgeeks.org/diff3-command-in-linux-with-examples/ (^^')

conflicts specifically and a few more improvements.

dev-ardi · 2024-05-17T13:51:19Z

@rustbot ready
Ended up going for vcs_conflict_marker for all pub methods to make sure that whoever is reading that knows outright what it's referring to.

Question about the review: I rebased edit the specific commit with the fix. Should I have made the fix commit and made the fixup rebase after you approve so that it's easier to review?

fmease

Those a very nice changes, thanks a lot for your patience! I've noticed two small things but they're not worth blocking on. That can be done when fixing #113826, maybe you're up for it? ;).

fmease · 2024-05-18T00:22:02Z

compiler/rustc_parse/src/parser/diagnostics.rs

+    /// * `>>>>>`
+    /// * `=====`
+    /// * `<<<<<`
+    ///


Suggested change

/// * `>>>>>`

/// * `=====`

/// * `<<<<<`

///

/// * `>>>>>`

/// * `|||||`

/// * `=====`

/// * `<<<<<`

fmease · 2024-05-18T00:22:33Z

compiler/rustc_parse/src/parser/stmt.rs

@@ -567,7 +567,7 @@ impl<'a> Parser<'a> {
            if self.token == token::Eof {
                break;
            }
-            if self.is_diff_marker(&TokenKind::BinOp(token::Shl), &TokenKind::Lt) {
+            if self.is_vcs_conflict_marker(&TokenKind::BinOp(token::Shl), &TokenKind::Lt) {
                // Account for `<<<<<<<` diff markers. We can't proactively error here because


Suggested change

// Account for `<<<<<<<` diff markers. We can't proactively error here because

// Account for `<<<<<<<` conflict markers. We can't proactively error here because

fmease · 2024-05-18T00:27:57Z

@bors r=wesleywiser,fmease rollup

bors · 2024-05-18T00:27:59Z

📌 Commit f8433a8 has been approved by wesleywiser,fmease

It is now in the queue for this repository.

…iaskrgr Rollup of 4 pull requests Successful merges: - rust-lang#125117 (Improve parser) - rust-lang#125184 (Fix ICE in non-operand `aggregate_raw_ptr` intrinsic codegen) - rust-lang#125240 (Temporarily revert to NonZeroUsize in rustc-abi to fix building on stable) - rust-lang#125248 (Migrate `run-make/rustdoc-scrape-examples-invalid-expr` to `rmake.rs`) r? `@ghost` `@rustbot` modify labels: rollup

Rollup merge of rust-lang#125117 - dev-ardi:improve-parser, r=wesleywiser,fmease Improve parser Fixes rust-lang#124935. - Add a few more help diagnostics to incorrect semicolons - Overall improved that function - Addded a few comments - Renamed diff_marker fns to git_diff_marker

Fix parsing of erroneously placed semicolons This closes rust-lang#124935, is a continuation of rust-lang#125245 after rebasing rust-lang#125117. Thanks `@gurry` for your code and sorry for making it confusing :P r? fmease

Fix parsing of erroneously placed semicolons This closes rust-lang#124935, is a continuation of rust-lang#125245 after rebasing rust-lang#125117. Thanks ``@gurry`` for your code and sorry for making it confusing :P r? fmease

Fix parsing of erroneously placed semicolons This closes rust-lang#124935, is a continuation of rust-lang#125245 after rebasing rust-lang#125117. Thanks ```@gurry``` for your code and sorry for making it confusing :P r? fmease

Rollup merge of rust-lang#125276 - dev-ardi:no-main-diag, r=fmease Fix parsing of erroneously placed semicolons This closes rust-lang#124935, is a continuation of rust-lang#125245 after rebasing rust-lang#125117. Thanks ```@gurry``` for your code and sorry for making it confusing :P r? fmease

rustbot assigned wesleywiser May 14, 2024

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improve maybe_consume_incorrect_semicolon

8dc6a5d

dev-ardi force-pushed the improve-parser branch from 444d380 to f1b404c Compare May 14, 2024 21:08

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels May 14, 2024

fmease self-assigned this May 15, 2024

fmease added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels May 15, 2024

dev-ardi added 3 commits May 17, 2024 15:45

Clarify that the diff_marker is talking about version control system

1f6d271

conflicts specifically and a few more improvements.

s/(Ident, ItemKind)/ItemInfo/

db5a616

use signature name for arg

f8433a8

dev-ardi force-pushed the improve-parser branch from f1b404c to f8433a8 Compare May 17, 2024 13:47

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fmease mentioned this pull request May 18, 2024

Fix parsing of erroneously placed semicolons #125245

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matthiaskrgr mentioned this pull request May 18, 2024

Rollup of 4 pull requests #125254

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bors merged commit f9bf759 into rust-lang:master May 18, 2024
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dev-ardi deleted the improve-parser branch May 19, 2024 12:32

dev-ardi mentioned this pull request May 19, 2024

Fix parsing of erroneously placed semicolons #125276

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Improve parser #125117

Improve parser #125117

dev-ardi commented May 14, 2024 •

edited by fmease

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	// Account for `<<<<<<<` diff markers. We can't proactively error here because
	// Account for `<<<<<<<` conflict markers. We can't proactively error here because

Improve parser #125117

Improve parser #125117

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