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|
use hir::{db::HirDatabase, source_binder};
use ra_db::SourceDatabase;
use ra_syntax::{algo::find_node_at_offset, ast, AstNode};
use crate::{db::RootDatabase, FilePosition, NavigationTarget, RangeInfo};
pub(crate) fn goto_implementation(
db: &RootDatabase,
position: FilePosition,
) -> Option<RangeInfo<Vec<NavigationTarget>>> {
let file = db.parse(position.file_id).tree;
let syntax = file.syntax();
let module = source_binder::module_from_position(db, position)?;
if let Some(nominal_def) = find_node_at_offset::<ast::NominalDef>(syntax, position.offset) {
return Some(RangeInfo::new(
nominal_def.syntax().range(),
impls_for_def(db, nominal_def, module)?,
));
} else if let Some(trait_def) = find_node_at_offset::<ast::TraitDef>(syntax, position.offset) {
return Some(RangeInfo::new(
trait_def.syntax().range(),
impls_for_trait(db, trait_def, module)?,
));
}
None
}
fn impls_for_def(
db: &RootDatabase,
node: &ast::NominalDef,
module: hir::Module,
) -> Option<Vec<NavigationTarget>> {
let ty = match node.kind() {
ast::NominalDefKind::StructDef(def) => {
source_binder::struct_from_module(db, module, &def).ty(db)
}
ast::NominalDefKind::EnumDef(def) => {
source_binder::enum_from_module(db, module, &def).ty(db)
}
};
let krate = module.krate(db)?;
let impls = db.impls_in_crate(krate);
Some(
impls
.lookup_impl_blocks(&ty)
.map(|imp| NavigationTarget::from_impl_block(db, imp))
.collect(),
)
}
fn impls_for_trait(
db: &RootDatabase,
node: &ast::TraitDef,
module: hir::Module,
) -> Option<Vec<NavigationTarget>> {
let tr = source_binder::trait_from_module(db, module, node);
let krate = module.krate(db)?;
let impls = db.impls_in_crate(krate);
Some(
impls
.lookup_impl_blocks_for_trait(&tr)
.map(|imp| NavigationTarget::from_impl_block(db, imp))
.collect(),
)
}
#[cfg(test)]
mod tests {
use crate::mock_analysis::analysis_and_position;
fn check_goto(fixture: &str, expected: &[&str]) {
let (analysis, pos) = analysis_and_position(fixture);
let mut navs = analysis.goto_implementation(pos).unwrap().unwrap().info;
assert_eq!(navs.len(), expected.len());
navs.sort_by_key(|nav| (nav.file_id(), nav.full_range().start()));
navs.into_iter().enumerate().for_each(|(i, nav)| nav.assert_match(expected[i]));
}
#[test]
fn goto_implementation_works() {
check_goto(
"
//- /lib.rs
struct Foo<|>;
impl Foo {}
",
&["impl IMPL_BLOCK FileId(1) [12; 23)"],
);
}
#[test]
fn goto_implementation_works_multiple_blocks() {
check_goto(
"
//- /lib.rs
struct Foo<|>;
impl Foo {}
impl Foo {}
",
&["impl IMPL_BLOCK FileId(1) [12; 23)", "impl IMPL_BLOCK FileId(1) [24; 35)"],
);
}
#[test]
fn goto_implementation_works_multiple_mods() {
check_goto(
"
//- /lib.rs
struct Foo<|>;
mod a {
impl super::Foo {}
}
mod b {
impl super::Foo {}
}
",
&["impl IMPL_BLOCK FileId(1) [24; 42)", "impl IMPL_BLOCK FileId(1) [57; 75)"],
);
}
#[test]
fn goto_implementation_works_multiple_files() {
check_goto(
"
//- /lib.rs
struct Foo<|>;
mod a;
mod b;
//- /a.rs
impl crate::Foo {}
//- /b.rs
impl crate::Foo {}
",
&["impl IMPL_BLOCK FileId(2) [0; 18)", "impl IMPL_BLOCK FileId(3) [0; 18)"],
);
}
#[test]
fn goto_implementation_for_trait() {
check_goto(
"
//- /lib.rs
trait T<|> {}
struct Foo;
impl T for Foo {}
",
&["impl IMPL_BLOCK FileId(1) [23; 40)"],
);
}
#[test]
fn goto_implementation_for_trait_multiple_files() {
check_goto(
"
//- /lib.rs
trait T<|> {};
struct Foo;
mod a;
mod b;
//- /a.rs
impl crate::T for crate::Foo {}
//- /b.rs
impl crate::T for crate::Foo {}
",
&["impl IMPL_BLOCK FileId(2) [0; 31)", "impl IMPL_BLOCK FileId(3) [0; 31)"],
);
}
}
|
