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|
use hir::{Ty, Def};
use crate::Cancelable;
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) -> Cancelable<()> {
let (function, receiver) = match (&ctx.function, ctx.dot_receiver) {
(Some(function), Some(receiver)) => (function, receiver),
_ => return Ok(()),
};
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 Ok(()),
};
let receiver_ty = infer_result[expr].clone();
if !ctx.is_method_call {
complete_fields(acc, ctx, receiver_ty)?;
}
Ok(())
}
fn complete_fields(acc: &mut Completions, ctx: &CompletionContext, receiver: Ty) -> Cancelable<()> {
for receiver in receiver.autoderef(ctx.db) {
match receiver {
Ty::Adt { def_id, .. } => {
match def_id.resolve(ctx.db)? {
Def::Struct(s) => {
let variant_data = s.variant_data(ctx.db)?;
for field in variant_data.fields() {
CompletionItem::new(
CompletionKind::Reference,
field.name().to_string(),
)
.kind(CompletionItemKind::Field)
.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);
}
}
_ => {}
};
}
Ok(())
}
#[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"#,
);
}
#[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"#,
);
}
#[test]
fn test_struct_field_completion_autoderef() {
check_ref_completion(
r"
struct A { the_field: u32 }
impl A {
fn foo(&self) {
self.<|>
}
}
",
r#"the_field"#,
);
}
#[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#""#,
);
}
}
|
