rustc_attr_parsing/attributes/
transparency.rs

1use rustc_feature::AttributeStability;
2use rustc_span::hygiene::Transparency;
3
4use super::prelude::*;
5
6pub(crate) struct RustcMacroTransparencyParser;
7
8impl SingleAttributeParser for RustcMacroTransparencyParser {
9    const PATH: &[Symbol] = &[sym::rustc_macro_transparency];
10    const STABILITY: AttributeStability = {
    _ = rustc_feature::Features::rustc_attrs;
    AttributeStability::Unstable {
        gate_name: rustc_span::sym::rustc_attrs,
        notes: &[],
    }
}unstable!(rustc_attrs);
11    const ALLOWED_TARGETS: AllowedTargets<'_> =
12        AllowedTargets::AllowList(&[Allow(Target::MacroDef)]);
13    const TEMPLATE: AttributeTemplate =
14        crate::AttributeTemplate {
    word: false,
    list: None,
    one_of: &[],
    name_value_str: Some(&["transparent", "semiopaque", "opaque"]),
    docs: None,
}template!(NameValueStr: ["transparent", "semiopaque", "opaque"]);
15
16    fn convert(cx: &mut AcceptContext<'_, '_>, args: &ArgParser) -> Option<AttributeKind> {
17        let nv = cx.expect_name_value(args, cx.attr_span, None)?;
18        match nv.value_as_str() {
19            Some(sym::transparent) => Some(Transparency::Transparent),
20            Some(sym::semiopaque) => Some(Transparency::SemiOpaque),
21            Some(sym::opaque) => Some(Transparency::Opaque),
22            Some(_) => {
23                cx.adcx().expected_specific_argument_strings(
24                    nv.value_span,
25                    &[sym::transparent, sym::semiopaque, sym::opaque],
26                );
27                None
28            }
29            None => None,
30        }
31        .map(AttributeKind::RustcMacroTransparency)
32    }
33}
rustc_attr_parsing/attributes/transparency.rs

rustc_attr_parsing/attributes/
transparency.rs
