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|
use hir::{Ty, Def};
use crate::completion::{CompletionContext, Completions, CompletionKind, CompletionItem, CompletionItemKind};
/// Complete dot accesses, i.e. fields or methods (currently only fields).
pub(super) fn complete_dot(acc: &mut Completions, ctx: &CompletionContext) {
let (function, receiver) = match (&ctx.function, ctx.dot_receiver) {
(Some(function), Some(receiver)) => (function, receiver),
_ => return,
};
let infer_result = function.infer(ctx.db);
let syntax_mapping = function.body_syntax_mapping(ctx.db);
let expr = match syntax_mapping.node_expr(receiver) {
Some(expr) => expr,
None => return,
};
let receiver_ty = infer_result[expr].clone();
if !ctx.is_call {
complete_fields(acc, ctx, receiver_ty.clone());
}
complete_methods(acc, ctx, receiver_ty);
}
fn complete_fields(acc: &mut Completions, ctx: &CompletionContext, receiver: Ty) {
for receiver in receiver.autoderef(ctx.db) {
match receiver {
Ty::Adt { def_id, .. } => {
match def_id.resolve(ctx.db) {
Def::Struct(s) => {
for field in s.fields(ctx.db) {
CompletionItem::new(
CompletionKind::Reference,
field.name().to_string(),
)
.kind(CompletionItemKind::Field)
.set_detail(field.ty(ctx.db).map(|ty| ty.to_string()))
.add_to(acc);
}
}
// TODO unions
_ => {}
}
}
Ty::Tuple(fields) => {
for (i, _ty) in fields.iter().enumerate() {
CompletionItem::new(CompletionKind::Reference, i.to_string())
.kind(CompletionItemKind::Field)
.add_to(acc);
}
}
_ => {}
};
}
}
fn complete_methods(acc: &mut Completions, ctx: &CompletionContext, receiver: Ty) {
receiver.iterate_methods(ctx.db, |func| {
let sig = func.signature(ctx.db);
if sig.has_self_param() {
CompletionItem::new(CompletionKind::Reference, sig.name().to_string())
.from_function(ctx, func)
.kind(CompletionItemKind::Method)
.add_to(acc);
}
None::<()>
});
}
#[cfg(test)]
mod tests {
use crate::completion::*;
fn check_ref_completion(code: &str, expected_completions: &str) {
check_completion(code, expected_completions, CompletionKind::Reference);
}
#[test]
fn test_struct_field_completion() {
check_ref_completion(
r"
struct A { the_field: u32 }
fn foo(a: A) {
a.<|>
}
",
r#"the_field "u32""#,
);
}
#[test]
fn test_struct_field_completion_self() {
check_ref_completion(
r"
struct A { the_field: (u32,) }
impl A {
fn foo(self) {
self.<|>
}
}
",
r#"the_field "(u32,)"
foo "foo($0)""#,
);
}
#[test]
fn test_struct_field_completion_autoderef() {
check_ref_completion(
r"
struct A { the_field: (u32, i32) }
impl A {
fn foo(&self) {
self.<|>
}
}
",
r#"the_field "(u32, i32)"
foo "foo($0)""#,
);
}
#[test]
fn test_no_struct_field_completion_for_method_call() {
check_ref_completion(
r"
struct A { the_field: u32 }
fn foo(a: A) {
a.<|>()
}
",
r#""#,
);
}
#[test]
fn test_method_completion() {
check_ref_completion(
r"
struct A {}
impl A {
fn the_method(&self) {}
}
fn foo(a: A) {
a.<|>
}
",
r#"the_method "the_method($0)""#,
);
}
#[test]
fn test_no_non_self_method() {
check_ref_completion(
r"
struct A {}
impl A {
fn the_method() {}
}
fn foo(a: A) {
a.<|>
}
",
r#""#,
);
}
}
|
