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//! Completion for derives
use hir::HasAttrs;
use itertools::Itertools;
use rustc_hash::FxHashMap;
use syntax::ast;
use crate::{
context::CompletionContext,
item::{CompletionItem, CompletionItemKind, CompletionKind},
Completions,
};
pub(super) fn complete_derive(
acc: &mut Completions,
ctx: &CompletionContext,
derive_input: ast::TokenTree,
) {
if let Some(existing_derives) = super::parse_comma_sep_input(derive_input) {
for (derive, docs) in get_derive_names_in_scope(ctx) {
let (label, lookup) = if let Some(derive_completion) = DEFAULT_DERIVE_COMPLETIONS
.iter()
.find(|derive_completion| derive_completion.label == derive)
{
let mut components = vec![derive_completion.label];
components.extend(
derive_completion
.dependencies
.iter()
.filter(|&&dependency| !existing_derives.contains(dependency)),
);
let lookup = components.join(", ");
let label = components.iter().rev().join(", ");
(label, Some(lookup))
} else {
(derive, None)
};
let mut item =
CompletionItem::new(CompletionKind::Attribute, ctx.source_range(), label);
item.kind(CompletionItemKind::Attribute);
if let Some(docs) = docs {
item.documentation(docs);
}
if let Some(lookup) = lookup {
item.lookup_by(lookup);
}
item.add_to(acc);
}
}
}
fn get_derive_names_in_scope(
ctx: &CompletionContext,
) -> FxHashMap<String, Option<hir::Documentation>> {
let mut result = FxHashMap::default();
ctx.scope.process_all_names(&mut |name, scope_def| {
if let hir::ScopeDef::MacroDef(mac) = scope_def {
if mac.kind() == hir::MacroKind::Derive {
result.insert(name.to_string(), mac.docs(ctx.db));
}
}
});
result
}
struct DeriveDependencies {
label: &'static str,
dependencies: &'static [&'static str],
}
/// Standard Rust derives that have dependencies
/// (the dependencies are needed so that the main derive don't break the compilation when added)
const DEFAULT_DERIVE_COMPLETIONS: &[DeriveDependencies] = &[
DeriveDependencies { label: "Copy", dependencies: &["Clone"] },
DeriveDependencies { label: "Eq", dependencies: &["PartialEq"] },
DeriveDependencies { label: "Ord", dependencies: &["PartialOrd", "Eq", "PartialEq"] },
DeriveDependencies { label: "PartialOrd", dependencies: &["PartialEq"] },
];
#[cfg(test)]
mod tests {
use expect_test::{expect, Expect};
use crate::{test_utils::completion_list, CompletionKind};
fn check(ra_fixture: &str, expect: Expect) {
let actual = completion_list(ra_fixture, CompletionKind::Attribute);
expect.assert_eq(&actual);
}
#[test]
fn no_completion_for_incorrect_derive() {
check(r#"#[derive{$0)] struct Test;"#, expect![[]])
}
#[test]
fn empty_derive() {
// FIXME: Add build-in derives to fixture.
check(r#"#[derive($0)] struct Test;"#, expect![[r#""#]]);
}
#[test]
fn derive_with_input() {
// FIXME: Add build-in derives to fixture.
check(r#"#[derive(serde::Serialize, PartialEq, $0)] struct Test;"#, expect![[r#""#]])
}
#[test]
fn derive_with_input2() {
// FIXME: Add build-in derives to fixture.
check(r#"#[derive($0 serde::Serialize, PartialEq)] struct Test;"#, expect![[r#""#]])
}
}
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