use hir::{Ty, Def}; use crate::completion::{CompletionContext, Completions, CompletionItem, CompletionItemKind}; use crate::completion::completion_item::CompletionKind; /// 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, ref substs, .. } => { match def_id.resolve(ctx.db) { Def::Struct(s) => { for field in s.fields(ctx.db) { CompletionItem::new( CompletionKind::Reference, ctx.source_range(), field.name().to_string(), ) .kind(CompletionItemKind::Field) .set_detail(field.ty(ctx.db).map(|ty| ty.subst(substs).to_string())) .add_to(acc); } } // TODO unions _ => {} } } Ty::Tuple(fields) => { for (i, _ty) in fields.iter().enumerate() { CompletionItem::new( CompletionKind::Reference, ctx.source_range(), 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, ctx.source_range(), sig.name().to_string(), ) .from_function(ctx, func) .kind(CompletionItemKind::Method) .add_to(acc); } None::<()> }); } #[cfg(test)] mod tests { use crate::completion::*; use crate::completion::completion_item::check_completion; fn check_ref_completion(name: &str, code: &str) { check_completion(name, code, CompletionKind::Reference); } #[test] fn test_struct_field_completion() { check_ref_completion( "struct_field_completion", r" struct A { the_field: u32 } fn foo(a: A) { a.<|> } ", ); } #[test] fn test_struct_field_completion_self() { check_ref_completion( "struct_field_completion_self", r" struct A { the_field: (u32,) } impl A { fn foo(self) { self.<|> } } ", ); } #[test] fn test_struct_field_completion_autoderef() { check_ref_completion( "struct_field_completion_autoderef", r" struct A { the_field: (u32, i32) } impl A { fn foo(&self) { self.<|> } } ", ); } #[test] fn test_no_struct_field_completion_for_method_call() { check_ref_completion( "no_struct_field_completion_for_method_call", r" struct A { the_field: u32 } fn foo(a: A) { a.<|>() } ", ); } #[test] fn test_method_completion() { check_ref_completion( "method_completion", r" struct A {} impl A { fn the_method(&self) {} } fn foo(a: A) { a.<|> } ", ); } #[test] fn test_no_non_self_method() { check_ref_completion( "no_non_self_method", r" struct A {} impl A { fn the_method() {} } fn foo(a: A) { a.<|> } ", ); } }