rustc_attr_parsing/attributes/
confusables.rs

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1use rustc_attr_data_structures::AttributeKind;
2use rustc_span::{Span, Symbol, sym};
3use thin_vec::ThinVec;
4
5use super::{AcceptMapping, AttributeParser};
6use crate::context::FinalizeContext;
7use crate::session_diagnostics;
8
9#[derive(Default)]
10pub(crate) struct ConfusablesParser {
11    confusables: ThinVec<Symbol>,
12    first_span: Option<Span>,
13}
14
15impl AttributeParser for ConfusablesParser {
16    const ATTRIBUTES: AcceptMapping<Self> = &[(&[sym::rustc_confusables], |this, cx, args| {
17        let Some(list) = args.list() else {
18            // FIXME(jdonszelmann): error when not a list? Bring validation code here.
19            //       NOTE: currently subsequent attributes are silently ignored using
20            //       tcx.get_attr().
21            return;
22        };
23
24        if list.is_empty() {
25            cx.emit_err(session_diagnostics::EmptyConfusables { span: cx.attr_span });
26        }
27
28        for param in list.mixed() {
29            let span = param.span();
30
31            let Some(lit) = param.lit() else {
32                cx.emit_err(session_diagnostics::IncorrectMetaItem {
33                    span,
34                    suggestion: Some(session_diagnostics::IncorrectMetaItemSuggestion {
35                        lo: span.shrink_to_lo(),
36                        hi: span.shrink_to_hi(),
37                    }),
38                });
39                continue;
40            };
41
42            this.confusables.push(lit.symbol);
43        }
44
45        this.first_span.get_or_insert(cx.attr_span);
46    })];
47
48    fn finalize(self, _cx: &FinalizeContext<'_>) -> Option<AttributeKind> {
49        if self.confusables.is_empty() {
50            return None;
51        }
52
53        Some(AttributeKind::Confusables {
54            symbols: self.confusables,
55            first_span: self.first_span.unwrap(),
56        })
57    }
58}
rustc_attr_parsing/attributes/confusables.rs

rustc_attr_parsing/attributes/
confusables.rs
