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_call { complete_fields(acc, ctx, receiver_ty.clone())?; } complete_methods(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) => { 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); } } _ => {} }; } Ok(()) } fn complete_methods( acc: &mut Completions, ctx: &CompletionContext, receiver: Ty, ) -> Cancelable<()> { 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); } Ok(None::<()>) })?; 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 "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#""#, ); } }