189f264926
Modify `AttributeTemplate` to support list of alternatives for list and name value attribute styles. Suggestions now provide more correct suggested code: ``` error[E0805]: malformed `used` attribute input --> $DIR/used_with_multi_args.rs:3:1 | LL | #[used(compiler, linker)] | ^^^^^^------------------^ | | | expected a single argument here | help: try changing it to one of the following valid forms of the attribute | LL - #[used(compiler, linker)] LL + #[used(compiler)] | LL - #[used(compiler, linker)] LL + #[used(linker)] | LL - #[used(compiler, linker)] LL + #[used] | ``` instead of the prior "masking" of the lack of this feature by suggesting pipe-separated lists: ``` error[E0805]: malformed `used` attribute input --> $DIR/used_with_multi_args.rs:3:1 | LL | #[used(compiler, linker)] | ^^^^^^------------------^ | | | expected a single argument here | help: try changing it to one of the following valid forms of the attribute | LL - #[used(compiler, linker)] LL + #[used(compiler|linker)] | LL - #[used(compiler, linker)] LL + #[used] | ```
72 lines
2.2 KiB
Rust
72 lines
2.2 KiB
Rust
//! Implementation of the `#[cfg_accessible(path)]` attribute macro.
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use rustc_ast as ast;
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use rustc_expand::base::{Annotatable, ExpandResult, ExtCtxt, Indeterminate, MultiItemModifier};
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use rustc_feature::AttributeTemplate;
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use rustc_parse::validate_attr;
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use rustc_span::{Span, sym};
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use crate::errors;
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pub(crate) struct Expander;
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fn validate_input<'a>(ecx: &ExtCtxt<'_>, mi: &'a ast::MetaItem) -> Option<&'a ast::Path> {
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use errors::CfgAccessibleInvalid::*;
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match mi.meta_item_list() {
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None => {}
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Some([]) => {
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ecx.dcx().emit_err(UnspecifiedPath(mi.span));
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}
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Some([_, .., l]) => {
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ecx.dcx().emit_err(MultiplePaths(l.span()));
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}
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Some([nmi]) => match nmi.meta_item() {
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None => {
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ecx.dcx().emit_err(LiteralPath(nmi.span()));
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}
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Some(mi) => {
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if !mi.is_word() {
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ecx.dcx().emit_err(HasArguments(mi.span));
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}
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return Some(&mi.path);
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}
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},
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}
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None
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}
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impl MultiItemModifier for Expander {
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fn expand(
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&self,
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ecx: &mut ExtCtxt<'_>,
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span: Span,
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meta_item: &ast::MetaItem,
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item: Annotatable,
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_is_derive_const: bool,
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) -> ExpandResult<Vec<Annotatable>, Annotatable> {
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let template = AttributeTemplate { list: Some(&["path"]), ..Default::default() };
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validate_attr::check_builtin_meta_item(
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&ecx.sess.psess,
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meta_item,
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ast::AttrStyle::Outer,
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sym::cfg_accessible,
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template,
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true,
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);
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let Some(path) = validate_input(ecx, meta_item) else {
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return ExpandResult::Ready(Vec::new());
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};
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match ecx.resolver.cfg_accessible(ecx.current_expansion.id, path) {
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Ok(true) => ExpandResult::Ready(vec![item]),
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Ok(false) => ExpandResult::Ready(Vec::new()),
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Err(Indeterminate) if ecx.force_mode => {
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ecx.dcx().emit_err(errors::CfgAccessibleIndeterminate { span });
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ExpandResult::Ready(vec![item])
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}
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Err(Indeterminate) => ExpandResult::Retry(item),
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}
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}
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}
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