diff options
Diffstat (limited to 'crates/ide_assists/src/handlers/generate_enum_projection_method.rs')
-rw-r--r-- | crates/ide_assists/src/handlers/generate_enum_projection_method.rs | 307 |
1 files changed, 307 insertions, 0 deletions
diff --git a/crates/ide_assists/src/handlers/generate_enum_projection_method.rs b/crates/ide_assists/src/handlers/generate_enum_projection_method.rs new file mode 100644 index 000000000..71447f310 --- /dev/null +++ b/crates/ide_assists/src/handlers/generate_enum_projection_method.rs | |||
@@ -0,0 +1,307 @@ | |||
1 | use itertools::Itertools; | ||
2 | use stdx::to_lower_snake_case; | ||
3 | use syntax::ast::VisibilityOwner; | ||
4 | use syntax::ast::{self, AstNode, NameOwner}; | ||
5 | |||
6 | use crate::{ | ||
7 | utils::{add_method_to_adt, find_struct_impl}, | ||
8 | AssistContext, AssistId, AssistKind, Assists, | ||
9 | }; | ||
10 | |||
11 | // Assist: generate_enum_into_method | ||
12 | // | ||
13 | // Generate an `into_` method for an enum variant. | ||
14 | // | ||
15 | // ``` | ||
16 | // enum Value { | ||
17 | // Number(i32), | ||
18 | // Text(String)$0, | ||
19 | // } | ||
20 | // ``` | ||
21 | // -> | ||
22 | // ``` | ||
23 | // enum Value { | ||
24 | // Number(i32), | ||
25 | // Text(String), | ||
26 | // } | ||
27 | // | ||
28 | // impl Value { | ||
29 | // fn into_text(self) -> Option<String> { | ||
30 | // if let Self::Text(v) = self { | ||
31 | // Some(v) | ||
32 | // } else { | ||
33 | // None | ||
34 | // } | ||
35 | // } | ||
36 | // } | ||
37 | // ``` | ||
38 | pub(crate) fn generate_enum_into_method(acc: &mut Assists, ctx: &AssistContext) -> Option<()> { | ||
39 | generate_enum_projection_method( | ||
40 | acc, | ||
41 | ctx, | ||
42 | "generate_enum_into_method", | ||
43 | "Generate an `into_` method for an enum variant", | ||
44 | "into", | ||
45 | "", | ||
46 | ) | ||
47 | } | ||
48 | |||
49 | // Assist: generate_enum_as_method | ||
50 | // | ||
51 | // Generate an `as_` method for an enum variant. | ||
52 | // | ||
53 | // ``` | ||
54 | // enum Value { | ||
55 | // Number(i32), | ||
56 | // Text(String)$0, | ||
57 | // } | ||
58 | // ``` | ||
59 | // -> | ||
60 | // ``` | ||
61 | // enum Value { | ||
62 | // Number(i32), | ||
63 | // Text(String), | ||
64 | // } | ||
65 | // | ||
66 | // impl Value { | ||
67 | // fn as_text(&self) -> Option<&String> { | ||
68 | // if let Self::Text(v) = self { | ||
69 | // Some(v) | ||
70 | // } else { | ||
71 | // None | ||
72 | // } | ||
73 | // } | ||
74 | // } | ||
75 | // ``` | ||
76 | pub(crate) fn generate_enum_as_method(acc: &mut Assists, ctx: &AssistContext) -> Option<()> { | ||
77 | generate_enum_projection_method( | ||
78 | acc, | ||
79 | ctx, | ||
80 | "generate_enum_as_method", | ||
81 | "Generate an `as_` method for an enum variant", | ||
82 | "as", | ||
83 | "&", | ||
84 | ) | ||
85 | } | ||
86 | |||
87 | pub(crate) fn generate_enum_projection_method( | ||
88 | acc: &mut Assists, | ||
89 | ctx: &AssistContext, | ||
90 | assist_id: &'static str, | ||
91 | assist_description: &str, | ||
92 | fn_name_prefix: &str, | ||
93 | ref_prefix: &str, | ||
94 | ) -> Option<()> { | ||
95 | let variant = ctx.find_node_at_offset::<ast::Variant>()?; | ||
96 | let variant_name = variant.name()?; | ||
97 | let parent_enum = ast::Adt::Enum(variant.parent_enum()); | ||
98 | |||
99 | let (pattern_suffix, field_type, bound_name) = match variant.kind() { | ||
100 | ast::StructKind::Record(record) => { | ||
101 | let (field,) = record.fields().collect_tuple()?; | ||
102 | let name = field.name()?.to_string(); | ||
103 | let ty = field.ty()?; | ||
104 | let pattern_suffix = format!(" {{ {} }}", name); | ||
105 | (pattern_suffix, ty, name) | ||
106 | } | ||
107 | ast::StructKind::Tuple(tuple) => { | ||
108 | let (field,) = tuple.fields().collect_tuple()?; | ||
109 | let ty = field.ty()?; | ||
110 | ("(v)".to_owned(), ty, "v".to_owned()) | ||
111 | } | ||
112 | ast::StructKind::Unit => return None, | ||
113 | }; | ||
114 | |||
115 | let fn_name = format!("{}_{}", fn_name_prefix, &to_lower_snake_case(variant_name.text())); | ||
116 | |||
117 | // Return early if we've found an existing new fn | ||
118 | let impl_def = find_struct_impl(&ctx, &parent_enum, &fn_name)?; | ||
119 | |||
120 | let target = variant.syntax().text_range(); | ||
121 | acc.add(AssistId(assist_id, AssistKind::Generate), assist_description, target, |builder| { | ||
122 | let vis = parent_enum.visibility().map_or(String::new(), |v| format!("{} ", v)); | ||
123 | let method = format!( | ||
124 | " {0}fn {1}({2}self) -> Option<{2}{3}> {{ | ||
125 | if let Self::{4}{5} = self {{ | ||
126 | Some({6}) | ||
127 | }} else {{ | ||
128 | None | ||
129 | }} | ||
130 | }}", | ||
131 | vis, | ||
132 | fn_name, | ||
133 | ref_prefix, | ||
134 | field_type.syntax(), | ||
135 | variant_name, | ||
136 | pattern_suffix, | ||
137 | bound_name, | ||
138 | ); | ||
139 | |||
140 | add_method_to_adt(builder, &parent_enum, impl_def, &method); | ||
141 | }) | ||
142 | } | ||
143 | |||
144 | #[cfg(test)] | ||
145 | mod tests { | ||
146 | use crate::tests::{check_assist, check_assist_not_applicable}; | ||
147 | |||
148 | use super::*; | ||
149 | |||
150 | #[test] | ||
151 | fn test_generate_enum_into_tuple_variant() { | ||
152 | check_assist( | ||
153 | generate_enum_into_method, | ||
154 | r#" | ||
155 | enum Value { | ||
156 | Number(i32), | ||
157 | Text(String)$0, | ||
158 | }"#, | ||
159 | r#"enum Value { | ||
160 | Number(i32), | ||
161 | Text(String), | ||
162 | } | ||
163 | |||
164 | impl Value { | ||
165 | fn into_text(self) -> Option<String> { | ||
166 | if let Self::Text(v) = self { | ||
167 | Some(v) | ||
168 | } else { | ||
169 | None | ||
170 | } | ||
171 | } | ||
172 | }"#, | ||
173 | ); | ||
174 | } | ||
175 | |||
176 | #[test] | ||
177 | fn test_generate_enum_into_already_implemented() { | ||
178 | check_assist_not_applicable( | ||
179 | generate_enum_into_method, | ||
180 | r#"enum Value { | ||
181 | Number(i32), | ||
182 | Text(String)$0, | ||
183 | } | ||
184 | |||
185 | impl Value { | ||
186 | fn into_text(self) -> Option<String> { | ||
187 | if let Self::Text(v) = self { | ||
188 | Some(v) | ||
189 | } else { | ||
190 | None | ||
191 | } | ||
192 | } | ||
193 | }"#, | ||
194 | ); | ||
195 | } | ||
196 | |||
197 | #[test] | ||
198 | fn test_generate_enum_into_unit_variant() { | ||
199 | check_assist_not_applicable( | ||
200 | generate_enum_into_method, | ||
201 | r#"enum Value { | ||
202 | Number(i32), | ||
203 | Text(String), | ||
204 | Unit$0, | ||
205 | }"#, | ||
206 | ); | ||
207 | } | ||
208 | |||
209 | #[test] | ||
210 | fn test_generate_enum_into_record_with_multiple_fields() { | ||
211 | check_assist_not_applicable( | ||
212 | generate_enum_into_method, | ||
213 | r#"enum Value { | ||
214 | Number(i32), | ||
215 | Text(String), | ||
216 | Both { first: i32, second: String }$0, | ||
217 | }"#, | ||
218 | ); | ||
219 | } | ||
220 | |||
221 | #[test] | ||
222 | fn test_generate_enum_into_tuple_with_multiple_fields() { | ||
223 | check_assist_not_applicable( | ||
224 | generate_enum_into_method, | ||
225 | r#"enum Value { | ||
226 | Number(i32), | ||
227 | Text(String, String)$0, | ||
228 | }"#, | ||
229 | ); | ||
230 | } | ||
231 | |||
232 | #[test] | ||
233 | fn test_generate_enum_into_record_variant() { | ||
234 | check_assist( | ||
235 | generate_enum_into_method, | ||
236 | r#"enum Value { | ||
237 | Number(i32), | ||
238 | Text { text: String }$0, | ||
239 | }"#, | ||
240 | r#"enum Value { | ||
241 | Number(i32), | ||
242 | Text { text: String }, | ||
243 | } | ||
244 | |||
245 | impl Value { | ||
246 | fn into_text(self) -> Option<String> { | ||
247 | if let Self::Text { text } = self { | ||
248 | Some(text) | ||
249 | } else { | ||
250 | None | ||
251 | } | ||
252 | } | ||
253 | }"#, | ||
254 | ); | ||
255 | } | ||
256 | |||
257 | #[test] | ||
258 | fn test_generate_enum_as_tuple_variant() { | ||
259 | check_assist( | ||
260 | generate_enum_as_method, | ||
261 | r#" | ||
262 | enum Value { | ||
263 | Number(i32), | ||
264 | Text(String)$0, | ||
265 | }"#, | ||
266 | r#"enum Value { | ||
267 | Number(i32), | ||
268 | Text(String), | ||
269 | } | ||
270 | |||
271 | impl Value { | ||
272 | fn as_text(&self) -> Option<&String> { | ||
273 | if let Self::Text(v) = self { | ||
274 | Some(v) | ||
275 | } else { | ||
276 | None | ||
277 | } | ||
278 | } | ||
279 | }"#, | ||
280 | ); | ||
281 | } | ||
282 | |||
283 | #[test] | ||
284 | fn test_generate_enum_as_record_variant() { | ||
285 | check_assist( | ||
286 | generate_enum_as_method, | ||
287 | r#"enum Value { | ||
288 | Number(i32), | ||
289 | Text { text: String }$0, | ||
290 | }"#, | ||
291 | r#"enum Value { | ||
292 | Number(i32), | ||
293 | Text { text: String }, | ||
294 | } | ||
295 | |||
296 | impl Value { | ||
297 | fn as_text(&self) -> Option<&String> { | ||
298 | if let Self::Text { text } = self { | ||
299 | Some(text) | ||
300 | } else { | ||
301 | None | ||
302 | } | ||
303 | } | ||
304 | }"#, | ||
305 | ); | ||
306 | } | ||
307 | } | ||