1 use stdx::{format_to, to_lower_snake_case};
2 use syntax::ast::VisibilityOwner;
3 use syntax::ast::{self, AstNode, NameOwner};
6 utils::{find_impl_block, find_struct_impl, generate_impl_text},
7 AssistContext, AssistId, AssistKind, Assists,
10 // Assist: generate_getter_mut
12 // Generate a mut getter method.
26 // /// Get a mutable reference to the person's name.
27 // fn name_mut(&mut self) -> &mut String {
32 pub(crate) fn generate_getter_mut(acc: &mut Assists, ctx: &AssistContext) -> Option<()> {
33 let strukt = ctx.find_node_at_offset::<ast::Struct>()?;
34 let field = ctx.find_node_at_offset::<ast::RecordField>()?;
36 let strukt_name = strukt.name()?;
37 let field_name = field.name()?;
38 let field_ty = field.ty()?;
40 // Return early if we've found an existing fn
41 let fn_name = to_lower_snake_case(&field_name.to_string());
42 let impl_def = find_struct_impl(
44 &ast::Adt::Struct(strukt.clone()),
45 format!("{}_mut", fn_name).as_str(),
48 let target = field.syntax().text_range();
50 AssistId("generate_getter_mut", AssistKind::Generate),
51 "Generate a mut getter method",
54 let mut buf = String::with_capacity(512);
55 let fn_name_spaced = fn_name.replace('_', " ");
56 let strukt_name_spaced =
57 to_lower_snake_case(&strukt_name.to_string()).replace('_', " ");
59 if impl_def.is_some() {
63 let vis = strukt.visibility().map_or(String::new(), |v| format!("{} ", v));
66 " /// Get a mutable reference to the {}'s {}.
67 {}fn {}_mut(&mut self) -> &mut {} {{
78 let start_offset = impl_def
79 .and_then(|impl_def| find_impl_block(impl_def, &mut buf))
81 buf = generate_impl_text(&ast::Adt::Struct(strukt.clone()), &buf);
82 strukt.syntax().text_range().end()
85 builder.insert(start_offset, buf);
92 use crate::tests::{check_assist, check_assist_not_applicable};
96 fn check_not_applicable(ra_fixture: &str) {
97 check_assist_not_applicable(generate_getter_mut, ra_fixture)
101 fn test_generate_getter_mut_from_field() {
105 struct Context<T: Clone> {
109 struct Context<T: Clone> {
113 impl<T: Clone> Context<T> {
114 /// Get a mutable reference to the context's data.
115 fn data_mut(&mut self) -> &mut T {
123 fn test_generate_getter_mut_already_implemented() {
124 check_not_applicable(
126 struct Context<T: Clone> {
130 impl<T: Clone> Context<T> {
131 fn data_mut(&mut self) -> &mut T {
139 fn test_generate_getter_mut_from_field_with_visibility_marker() {
143 pub(crate) struct Context<T: Clone> {
147 pub(crate) struct Context<T: Clone> {
151 impl<T: Clone> Context<T> {
152 /// Get a mutable reference to the context's data.
153 pub(crate) fn data_mut(&mut self) -> &mut T {