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use std::iter;
use rustc_attr_data_structures::AttributeKind;
use rustc_span::{Span, Symbol, sym};
use super::{CombineAttributeParser, ConvertFn};
use crate::context::AcceptContext;
use crate::parser::ArgParser;
use crate::session_diagnostics;
pub(crate) struct AllowInternalUnstableParser;
impl CombineAttributeParser for AllowInternalUnstableParser {
const PATH: &'static [rustc_span::Symbol] = &[sym::allow_internal_unstable];
type Item = (Symbol, Span);
const CONVERT: ConvertFn<Self::Item> = AttributeKind::AllowInternalUnstable;
fn extend<'a>(
cx: &'a AcceptContext<'a>,
args: &'a ArgParser<'a>,
) -> impl IntoIterator<Item = Self::Item> + 'a {
parse_unstable(cx, args, Self::PATH[0]).into_iter().zip(iter::repeat(cx.attr_span))
}
}
pub(crate) struct AllowConstFnUnstableParser;
impl CombineAttributeParser for AllowConstFnUnstableParser {
const PATH: &'static [rustc_span::Symbol] = &[sym::rustc_allow_const_fn_unstable];
type Item = Symbol;
const CONVERT: ConvertFn<Self::Item> = AttributeKind::AllowConstFnUnstable;
fn extend<'a>(
cx: &'a AcceptContext<'a>,
args: &'a ArgParser<'a>,
) -> impl IntoIterator<Item = Self::Item> + 'a {
parse_unstable(cx, args, Self::PATH[0])
}
}
fn parse_unstable<'a>(
cx: &AcceptContext<'_>,
args: &'a ArgParser<'a>,
symbol: Symbol,
) -> impl IntoIterator<Item = Symbol> {
let mut res = Vec::new();
let Some(list) = args.list() else {
cx.emit_err(session_diagnostics::ExpectsFeatureList {
span: cx.attr_span,
name: symbol.to_ident_string(),
});
return res;
};
for param in list.mixed() {
let param_span = param.span();
if let Some(ident) = param.meta_item().and_then(|i| i.path_without_args().word()) {
res.push(ident.name);
} else {
cx.emit_err(session_diagnostics::ExpectsFeatures {
span: param_span,
name: symbol.to_ident_string(),
});
}
}
res
}
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