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|
use rustc_feature::{AttributeTemplate, template};
use rustc_hir::attrs::{AttributeKind, DeprecatedSince, Deprecation};
use rustc_span::{Span, Symbol, sym};
use super::util::parse_version;
use super::{AttributeOrder, OnDuplicate, SingleAttributeParser};
use crate::context::{AcceptContext, Stage};
use crate::parser::ArgParser;
use crate::session_diagnostics;
pub(crate) struct DeprecationParser;
fn get<S: Stage>(
cx: &AcceptContext<'_, '_, S>,
name: Symbol,
param_span: Span,
arg: &ArgParser<'_>,
item: &Option<Symbol>,
) -> Option<Symbol> {
if item.is_some() {
cx.duplicate_key(param_span, name);
return None;
}
if let Some(v) = arg.name_value() {
if let Some(value_str) = v.value_as_str() {
Some(value_str)
} else {
cx.expected_string_literal(v.value_span, Some(&v.value_as_lit()));
None
}
} else {
cx.expected_name_value(param_span, Some(name));
None
}
}
impl<S: Stage> SingleAttributeParser<S> for DeprecationParser {
const PATH: &[Symbol] = &[sym::deprecated];
const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepInnermost;
const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error;
const TEMPLATE: AttributeTemplate = template!(
Word,
List: r#"/*opt*/ since = "version", /*opt*/ note = "reason""#,
NameValueStr: "reason"
);
fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser<'_>) -> Option<AttributeKind> {
let features = cx.features();
let mut since = None;
let mut note = None;
let mut suggestion = None;
let is_rustc = features.staged_api();
match args {
ArgParser::NoArgs => {
// ok
}
ArgParser::List(list) => {
for param in list.mixed() {
let Some(param) = param.meta_item() else {
cx.unexpected_literal(param.span());
return None;
};
let ident_name = param.path().word_sym();
match ident_name {
Some(name @ sym::since) => {
since = Some(get(cx, name, param.span(), param.args(), &since)?);
}
Some(name @ sym::note) => {
note = Some(get(cx, name, param.span(), param.args(), ¬e)?);
}
Some(name @ sym::suggestion) => {
if !features.deprecated_suggestion() {
cx.emit_err(session_diagnostics::DeprecatedItemSuggestion {
span: param.span(),
is_nightly: cx.sess().is_nightly_build(),
details: (),
});
}
suggestion =
Some(get(cx, name, param.span(), param.args(), &suggestion)?);
}
_ => {
cx.unknown_key(
param.span(),
param.path().to_string(),
if features.deprecated_suggestion() {
&["since", "note", "suggestion"]
} else {
&["since", "note"]
},
);
return None;
}
}
}
}
ArgParser::NameValue(v) => {
let Some(value) = v.value_as_str() else {
cx.expected_string_literal(v.value_span, Some(v.value_as_lit()));
return None;
};
note = Some(value);
}
}
let since = if let Some(since) = since {
if since.as_str() == "TBD" {
DeprecatedSince::Future
} else if !is_rustc {
DeprecatedSince::NonStandard(since)
} else if let Some(version) = parse_version(since) {
DeprecatedSince::RustcVersion(version)
} else {
cx.emit_err(session_diagnostics::InvalidSince { span: cx.attr_span });
DeprecatedSince::Err
}
} else if is_rustc {
cx.emit_err(session_diagnostics::MissingSince { span: cx.attr_span });
DeprecatedSince::Err
} else {
DeprecatedSince::Unspecified
};
if is_rustc && note.is_none() {
cx.emit_err(session_diagnostics::MissingNote { span: cx.attr_span });
return None;
}
Some(AttributeKind::Deprecation {
deprecation: Deprecation { since, note, suggestion },
span: cx.attr_span,
})
}
}
|
