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Rollup merge of #104012 - chenyukang:yukang/fix-103882-deli-indentati…
…on, r=petrochenkov Improve unexpected close and mismatch delimiter hint in TokenTreesReader Fixes #103882 Fixes #68987 Fixes #69259 The inner indentation mismatching will be covered by outer block, the new added function `report_error_prone_delim_block` will find out the error prone candidates for reporting.
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Original file line number | Diff line number | Diff line change |
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use super::UnmatchedBrace; | ||
use rustc_ast::token::Delimiter; | ||
use rustc_errors::Diagnostic; | ||
use rustc_span::source_map::SourceMap; | ||
use rustc_span::Span; | ||
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#[derive(Default)] | ||
pub struct TokenTreeDiagInfo { | ||
/// Stack of open delimiters and their spans. Used for error message. | ||
pub open_braces: Vec<(Delimiter, Span)>, | ||
pub unmatched_braces: Vec<UnmatchedBrace>, | ||
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/// Used only for error recovery when arriving to EOF with mismatched braces. | ||
pub last_unclosed_found_span: Option<Span>, | ||
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/// Collect empty block spans that might have been auto-inserted by editors. | ||
pub empty_block_spans: Vec<Span>, | ||
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/// Collect the spans of braces (Open, Close). Used only | ||
/// for detecting if blocks are empty and only braces. | ||
pub matching_block_spans: Vec<(Span, Span)>, | ||
} | ||
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pub fn same_identation_level(sm: &SourceMap, open_sp: Span, close_sp: Span) -> bool { | ||
match (sm.span_to_margin(open_sp), sm.span_to_margin(close_sp)) { | ||
(Some(open_padding), Some(close_padding)) => open_padding == close_padding, | ||
_ => false, | ||
} | ||
} | ||
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// When we get a `)` or `]` for `{`, we should emit help message here | ||
// it's more friendly compared to report `unmatched error` in later phase | ||
pub fn report_missing_open_delim( | ||
err: &mut Diagnostic, | ||
unmatched_braces: &[UnmatchedBrace], | ||
) -> bool { | ||
let mut reported_missing_open = false; | ||
for unmatch_brace in unmatched_braces.iter() { | ||
if let Some(delim) = unmatch_brace.found_delim | ||
&& matches!(delim, Delimiter::Parenthesis | Delimiter::Bracket) | ||
{ | ||
let missed_open = match delim { | ||
Delimiter::Parenthesis => "(", | ||
Delimiter::Bracket => "[", | ||
_ => unreachable!(), | ||
}; | ||
err.span_label( | ||
unmatch_brace.found_span.shrink_to_lo(), | ||
format!("missing open `{}` for this delimiter", missed_open), | ||
); | ||
reported_missing_open = true; | ||
} | ||
} | ||
reported_missing_open | ||
} | ||
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pub fn report_suspicious_mismatch_block( | ||
err: &mut Diagnostic, | ||
diag_info: &TokenTreeDiagInfo, | ||
sm: &SourceMap, | ||
delim: Delimiter, | ||
) { | ||
if report_missing_open_delim(err, &diag_info.unmatched_braces) { | ||
return; | ||
} | ||
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let mut matched_spans: Vec<(Span, bool)> = diag_info | ||
.matching_block_spans | ||
.iter() | ||
.map(|&(open, close)| (open.with_hi(close.lo()), same_identation_level(sm, open, close))) | ||
.collect(); | ||
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// sort by `lo`, so the large block spans in the front | ||
matched_spans.sort_by(|a, b| a.0.lo().cmp(&b.0.lo())); | ||
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// We use larger block whose identation is well to cover those inner mismatched blocks | ||
// O(N^2) here, but we are on error reporting path, so it is fine | ||
for i in 0..matched_spans.len() { | ||
let (block_span, same_ident) = matched_spans[i]; | ||
if same_ident { | ||
for j in i + 1..matched_spans.len() { | ||
let (inner_block, inner_same_ident) = matched_spans[j]; | ||
if block_span.contains(inner_block) && !inner_same_ident { | ||
matched_spans[j] = (inner_block, true); | ||
} | ||
} | ||
} | ||
} | ||
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// Find the inner-most span candidate for final report | ||
let candidate_span = | ||
matched_spans.into_iter().rev().find(|&(_, same_ident)| !same_ident).map(|(span, _)| span); | ||
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if let Some(block_span) = candidate_span { | ||
err.span_label(block_span.shrink_to_lo(), "this delimiter might not be properly closed..."); | ||
err.span_label( | ||
block_span.shrink_to_hi(), | ||
"...as it matches this but it has different indentation", | ||
); | ||
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// If there is a empty block in the mismatched span, note it | ||
if delim == Delimiter::Brace { | ||
for span in diag_info.empty_block_spans.iter() { | ||
if block_span.contains(*span) { | ||
err.span_label(*span, "block is empty, you might have not meant to close it"); | ||
break; | ||
} | ||
} | ||
} | ||
} else { | ||
// If there is no suspicious span, give the last properly closed block may help | ||
if let Some(parent) = diag_info.matching_block_spans.last() | ||
&& diag_info.open_braces.last().is_none() | ||
&& diag_info.empty_block_spans.iter().all(|&sp| sp != parent.0.to(parent.1)) { | ||
err.span_label(parent.0, "this opening brace..."); | ||
err.span_label(parent.1, "...matches this closing brace"); | ||
} | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
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#![feature(let_chains)] | ||
trait Demo {} | ||
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impl dyn Demo { | ||
pub fn report(&self) -> u32 { | ||
let sum = |a: u32, | ||
b: u32, | ||
c: u32| { | ||
a + b + c | ||
}; | ||
sum(1, 2, 3) | ||
} | ||
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fn check(&self, val: Option<u32>, num: Option<u32>) { | ||
if let Some(b) = val | ||
&& let Some(c) = num { | ||
&& b == c { | ||
//~^ ERROR expected struct | ||
//~| ERROR mismatched types | ||
} | ||
} | ||
} | ||
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fn main() { } //~ ERROR this file contains an unclosed delimiter |
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