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|
use ra_syntax::ast::AstNode;
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 module = if let Some(module) = &ctx.module {
module
} else {
return Ok(());
};
let function = if let Some(fn_def) = ctx.enclosing_fn {
hir::source_binder::function_from_module(ctx.db, module, fn_def)
} else {
return Ok(());
};
let receiver = if let Some(receiver) = ctx.dot_receiver {
receiver
} else {
return Ok(());
};
let infer_result = function.infer(ctx.db)?;
let receiver_ty = if let Some(ty) = infer_result.type_of_node(receiver.syntax()) {
ty
} else {
return Ok(());
};
if !ctx.is_method_call {
complete_fields(acc, ctx, receiver_ty)?;
}
Ok(())
}
fn complete_fields(acc: &mut Completions, ctx: &CompletionContext, receiver: Ty) -> Cancelable<()> {
// TODO: autoderef etc.
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_no_struct_field_completion_for_method_call() {
check_ref_completion(
r"
struct A { the_field: u32 }
fn foo(a: A) {
a.<|>()
}
",
r#""#,
);
}
}
|
