1 use ide_db::assists::GroupLabel;
2 use stdx::to_lower_snake_case;
3 use syntax::ast::HasVisibility;
4 use syntax::ast::{self, AstNode, HasName};
7 utils::{add_method_to_adt, find_struct_impl},
8 AssistContext, AssistId, AssistKind, Assists,
11 // Assist: generate_enum_is_method
13 // Generate an `is_` method for this enum variant.
31 // /// Returns `true` if the version is [`Minor`].
33 // /// [`Minor`]: Version::Minor
35 // fn is_minor(&self) -> bool {
36 // matches!(self, Self::Minor)
40 pub(crate) fn generate_enum_is_method(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
41 let variant = ctx.find_node_at_offset::<ast::Variant>()?;
42 let variant_name = variant.name()?;
43 let parent_enum = ast::Adt::Enum(variant.parent_enum());
44 let pattern_suffix = match variant.kind() {
45 ast::StructKind::Record(_) => " { .. }",
46 ast::StructKind::Tuple(_) => "(..)",
47 ast::StructKind::Unit => "",
50 let enum_name = parent_enum.name()?;
51 let enum_lowercase_name = to_lower_snake_case(&enum_name.to_string()).replace('_', " ");
52 let fn_name = format!("is_{}", &to_lower_snake_case(&variant_name.text()));
54 // Return early if we've found an existing new fn
55 let impl_def = find_struct_impl(ctx, &parent_enum, &[fn_name.clone()])?;
57 let target = variant.syntax().text_range();
59 &GroupLabel("Generate an `is_`,`as_`, or `try_into_` for this enum variant".to_owned()),
60 AssistId("generate_enum_is_method", AssistKind::Generate),
61 "Generate an `is_` method for this enum variant",
64 let vis = parent_enum.visibility().map_or(String::new(), |v| format!("{v} "));
66 " /// Returns `true` if the {enum_lowercase_name} is [`{variant_name}`].
68 /// [`{variant_name}`]: {enum_name}::{variant_name}
70 {vis}fn {fn_name}(&self) -> bool {{
71 matches!(self, Self::{variant_name}{pattern_suffix})
75 add_method_to_adt(builder, &parent_enum, impl_def, &method);
82 use crate::tests::{check_assist, check_assist_not_applicable};
87 fn test_generate_enum_is_from_variant() {
89 generate_enum_is_method,
103 /// Returns `true` if the variant is [`Minor`].
105 /// [`Minor`]: Variant::Minor
107 fn is_minor(&self) -> bool {
108 matches!(self, Self::Minor)
115 fn test_generate_enum_is_already_implemented() {
116 check_assist_not_applicable(
117 generate_enum_is_method,
126 fn is_minor(&self) -> bool {
127 matches!(self, Self::Minor)
134 fn test_generate_enum_is_from_tuple_variant() {
136 generate_enum_is_method,
150 /// Returns `true` if the variant is [`Minor`].
152 /// [`Minor`]: Variant::Minor
154 fn is_minor(&self) -> bool {
155 matches!(self, Self::Minor(..))
162 fn test_generate_enum_is_from_record_variant() {
164 generate_enum_is_method,
168 Minor { foo: i32 }$0,
178 /// Returns `true` if the variant is [`Minor`].
180 /// [`Minor`]: Variant::Minor
182 fn is_minor(&self) -> bool {
183 matches!(self, Self::Minor { .. })
190 fn test_generate_enum_is_from_variant_with_one_variant() {
192 generate_enum_is_method,
193 r#"enum Variant { Undefi$0ned }"#,
195 enum Variant { Undefined }
198 /// Returns `true` if the variant is [`Undefined`].
200 /// [`Undefined`]: Variant::Undefined
202 fn is_undefined(&self) -> bool {
203 matches!(self, Self::Undefined)
210 fn test_generate_enum_is_from_variant_with_visibility_marker() {
212 generate_enum_is_method,
214 pub(crate) enum Variant {
219 r#"pub(crate) enum Variant {
226 /// Returns `true` if the variant is [`Minor`].
228 /// [`Minor`]: Variant::Minor
230 pub(crate) fn is_minor(&self) -> bool {
231 matches!(self, Self::Minor)
238 fn test_multiple_generate_enum_is_from_variant() {
240 generate_enum_is_method,
249 /// Returns `true` if the variant is [`Minor`].
251 /// [`Minor`]: Variant::Minor
253 fn is_minor(&self) -> bool {
254 matches!(self, Self::Minor)
264 /// Returns `true` if the variant is [`Minor`].
266 /// [`Minor`]: Variant::Minor
268 fn is_minor(&self) -> bool {
269 matches!(self, Self::Minor)
272 /// Returns `true` if the variant is [`Major`].
274 /// [`Major`]: Variant::Major
276 fn is_major(&self) -> bool {
277 matches!(self, Self::Major)
284 fn test_generate_enum_is_variant_names() {
286 generate_enum_is_method,
288 enum GeneratorState {
293 r#"enum GeneratorState {
299 impl GeneratorState {
300 /// Returns `true` if the generator state is [`Complete`].
302 /// [`Complete`]: GeneratorState::Complete
304 fn is_complete(&self) -> bool {
305 matches!(self, Self::Complete)