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|
//! Implementation of "implicit static" inlay hints:
//! ```no_run
//! static S: &/* 'static */str = "";
//! ```
use either::Either;
use syntax::{
ast::{self, AstNode},
SyntaxKind,
};
use crate::{InlayHint, InlayHintsConfig, InlayKind, LifetimeElisionHints};
pub(super) fn hints(
acc: &mut Vec<InlayHint>,
config: &InlayHintsConfig,
statik_or_const: Either<ast::Static, ast::Const>,
) -> Option<()> {
if config.lifetime_elision_hints != LifetimeElisionHints::Always {
return None;
}
if let Either::Right(it) = &statik_or_const {
if ast::AssocItemList::can_cast(
it.syntax().parent().map_or(SyntaxKind::EOF, |it| it.kind()),
) {
return None;
}
}
if let Some(ast::Type::RefType(ty)) = statik_or_const.either(|it| it.ty(), |it| it.ty()) {
if ty.lifetime().is_none() {
let t = ty.amp_token()?;
acc.push(InlayHint {
range: t.text_range(),
kind: InlayKind::Lifetime,
label: "'static".to_owned().into(),
});
}
}
Some(())
}
#[cfg(test)]
mod tests {
use crate::{
inlay_hints::tests::{check_with_config, TEST_CONFIG},
InlayHintsConfig, LifetimeElisionHints,
};
#[test]
fn hints_lifetimes_static() {
check_with_config(
InlayHintsConfig {
lifetime_elision_hints: LifetimeElisionHints::Always,
..TEST_CONFIG
},
r#"
trait Trait {}
static S: &str = "";
// ^'static
const C: &str = "";
// ^'static
const C: &dyn Trait = panic!();
// ^'static
impl () {
const C: &str = "";
const C: &dyn Trait = panic!();
}
"#,
);
}
}
|
