rustc_attr_parsing/attributes/
path.rs

1use rustc_attr_data_structures::AttributeKind;
2use rustc_feature::{AttributeTemplate, template};
3use rustc_span::{Symbol, sym};
4
5use crate::attributes::{AttributeOrder, OnDuplicate, SingleAttributeParser};
6use crate::context::{AcceptContext, Stage};
7use crate::parser::ArgParser;
8
9pub(crate) struct PathParser;
10
11impl<S: Stage> SingleAttributeParser<S> for PathParser {
12    const PATH: &[Symbol] = &[sym::path];
13    const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepLast;
14    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::WarnButFutureError;
15    const TEMPLATE: AttributeTemplate = template!(NameValueStr: "file");
16
17    fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser<'_>) -> Option<AttributeKind> {
18        let Some(nv) = args.name_value() else {
19            cx.expected_name_value(cx.attr_span, None);
20            return None;
21        };
22        let Some(path) = nv.value_as_str() else {
23            cx.expected_string_literal(nv.value_span, Some(nv.value_as_lit()));
24            return None;
25        };
26
27        Some(AttributeKind::Path(path, cx.attr_span))
28    }
29}