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|
//! Implementation of "enum variant discriminant" inlay hints:
//! ```no_run
//! enum Foo {
//! Bar/* = 0*/,
//! }
//! ```
use ide_db::{base_db::FileId, famous_defs::FamousDefs};
use syntax::ast::{self, AstNode, HasName};
use crate::{DiscriminantHints, InlayHint, InlayHintsConfig, InlayKind, InlayTooltip};
pub(super) fn hints(
acc: &mut Vec<InlayHint>,
FamousDefs(sema, _): &FamousDefs<'_, '_>,
config: &InlayHintsConfig,
_: FileId,
variant: &ast::Variant,
) -> Option<()> {
let field_list = match config.discriminant_hints {
DiscriminantHints::Always => variant.field_list(),
DiscriminantHints::Fieldless => match variant.field_list() {
Some(_) => return None,
None => None,
},
DiscriminantHints::Never => return None,
};
if variant.eq_token().is_some() {
return None;
}
let name = variant.name()?;
let descended = sema.descend_node_into_attributes(variant.clone()).pop();
let desc_pat = descended.as_ref().unwrap_or(variant);
let v = sema.to_def(desc_pat)?;
let d = v.eval(sema.db);
acc.push(InlayHint {
range: match field_list {
Some(field_list) => name.syntax().text_range().cover(field_list.syntax().text_range()),
None => name.syntax().text_range(),
},
kind: InlayKind::DiscriminantHint,
label: match &d {
Ok(v) => format!("{}", v).into(),
Err(_) => "?".into(),
},
tooltip: Some(InlayTooltip::String(match &d {
Ok(_) => "enum variant discriminant".into(),
Err(e) => format!("{e:?}").into(),
})),
});
Some(())
}
#[cfg(test)]
mod tests {
use crate::inlay_hints::{
tests::{check_with_config, DISABLED_CONFIG},
DiscriminantHints, InlayHintsConfig,
};
#[track_caller]
fn check_discriminants(ra_fixture: &str) {
check_with_config(
InlayHintsConfig { discriminant_hints: DiscriminantHints::Always, ..DISABLED_CONFIG },
ra_fixture,
);
}
#[track_caller]
fn check_discriminants_fieldless(ra_fixture: &str) {
check_with_config(
InlayHintsConfig {
discriminant_hints: DiscriminantHints::Fieldless,
..DISABLED_CONFIG
},
ra_fixture,
);
}
#[test]
fn fieldless() {
check_discriminants(
r#"
enum Enum {
Variant,
//^^^^^^^0
Variant1,
//^^^^^^^^1
Variant2,
//^^^^^^^^2
Variant5 = 5,
Variant6,
//^^^^^^^^6
}
"#,
);
}
#[test]
fn datacarrying_mixed() {
check_discriminants(
r#"
enum Enum {
Variant(),
//^^^^^^^^^0
Variant1,
//^^^^^^^^1
Variant2 {},
//^^^^^^^^^^^2
Variant3,
//^^^^^^^^3
Variant5 = 5,
Variant6,
//^^^^^^^^6
}
"#,
);
}
#[test]
fn datacarrying_mixed_fieldless_set() {
check_discriminants_fieldless(
r#"
enum Enum {
Variant(),
Variant1,
//^^^^^^^^1
Variant2 {},
Variant3,
//^^^^^^^^3
Variant5 = 5,
Variant6,
//^^^^^^^^6
}
"#,
);
}
}
|
