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-rw-r--r--crates/assists/src/handlers/generate_enum_match_method.rs100
-rw-r--r--crates/assists/src/handlers/generate_new.rs64
-rw-r--r--crates/assists/src/utils.rs75
3 files changed, 85 insertions, 154 deletions
diff --git a/crates/assists/src/handlers/generate_enum_match_method.rs b/crates/assists/src/handlers/generate_enum_match_method.rs
index 079ed27bd..270b438b7 100644
--- a/crates/assists/src/handlers/generate_enum_match_method.rs
+++ b/crates/assists/src/handlers/generate_enum_match_method.rs
@@ -1,10 +1,9 @@
1use hir::Adt; 1use stdx::{format_to, to_lower_snake_case};
2use stdx::format_to;
3use syntax::ast::{self, AstNode, NameOwner}; 2use syntax::ast::{self, AstNode, NameOwner};
4use syntax::{ast::VisibilityOwner, T}; 3use syntax::{ast::VisibilityOwner, T};
5use test_utils::mark; 4use test_utils::mark;
6 5
7use crate::{AssistContext, AssistId, AssistKind, Assists}; 6use crate::{utils::find_struct_impl, AssistContext, AssistId, AssistKind, Assists};
8 7
9// Assist: generate_enum_match_method 8// Assist: generate_enum_match_method
10// 9//
@@ -40,10 +39,14 @@ pub(crate) fn generate_enum_match_method(acc: &mut Assists, ctx: &AssistContext)
40 return None; 39 return None;
41 } 40 }
42 41
43 let fn_name = to_lower_snake_case(&format!("{}", variant_name)); 42 let fn_name = to_lower_snake_case(&variant_name.to_string());
44 43
45 // Return early if we've found an existing new fn 44 // Return early if we've found an existing new fn
46 let impl_def = find_struct_impl(&ctx, &parent_enum, format!("is_{}", fn_name).as_str())?; 45 let impl_def = find_struct_impl(
46 &ctx,
47 &ast::AdtDef::Enum(parent_enum.clone()),
48 format!("is_{}", fn_name).as_str(),
49 )?;
47 50
48 let target = variant.syntax().text_range(); 51 let target = variant.syntax().text_range();
49 acc.add( 52 acc.add(
@@ -95,94 +98,14 @@ pub(crate) fn generate_enum_match_method(acc: &mut Assists, ctx: &AssistContext)
95// parameters 98// parameters
96fn generate_impl_text(strukt: &ast::Enum, code: &str) -> String { 99fn generate_impl_text(strukt: &ast::Enum, code: &str) -> String {
97 let mut buf = String::with_capacity(code.len()); 100 let mut buf = String::with_capacity(code.len());
98 buf.push_str("\n\nimpl"); 101 buf.push_str("\n\nimpl ");
99 buf.push_str(" ");
100 buf.push_str(strukt.name().unwrap().text()); 102 buf.push_str(strukt.name().unwrap().text());
101 format_to!(buf, " {{\n{}\n}}", code); 103 format_to!(buf, " {{\n{}\n}}", code);
102 buf 104 buf
103} 105}
104 106
105fn to_lower_snake_case(s: &str) -> String {
106 let mut buf = String::with_capacity(s.len());
107 let mut prev = false;
108 for c in s.chars() {
109 if c.is_ascii_uppercase() && prev {
110 buf.push('_')
111 }
112 prev = true;
113
114 buf.push(c.to_ascii_lowercase());
115 }
116 buf
117}
118
119// Uses a syntax-driven approach to find any impl blocks for the struct that
120// exist within the module/file
121//
122// Returns `None` if we've found an existing `new` fn
123//
124// FIXME: change the new fn checking to a more semantic approach when that's more
125// viable (e.g. we process proc macros, etc)
126fn find_struct_impl(
127 ctx: &AssistContext,
128 strukt: &ast::Enum,
129 name: &str,
130) -> Option<Option<ast::Impl>> {
131 let db = ctx.db();
132 let module = strukt.syntax().ancestors().find(|node| {
133 ast::Module::can_cast(node.kind()) || ast::SourceFile::can_cast(node.kind())
134 })?;
135
136 let struct_def = ctx.sema.to_def(strukt)?;
137
138 let block = module.descendants().filter_map(ast::Impl::cast).find_map(|impl_blk| {
139 let blk = ctx.sema.to_def(&impl_blk)?;
140
141 // FIXME: handle e.g. `struct S<T>; impl<U> S<U> {}`
142 // (we currently use the wrong type parameter)
143 // also we wouldn't want to use e.g. `impl S<u32>`
144 let same_ty = match blk.target_ty(db).as_adt() {
145 Some(def) => def == Adt::Enum(struct_def),
146 None => false,
147 };
148 let not_trait_impl = blk.target_trait(db).is_none();
149
150 if !(same_ty && not_trait_impl) {
151 None
152 } else {
153 Some(impl_blk)
154 }
155 });
156
157 if let Some(ref impl_blk) = block {
158 if has_fn(impl_blk, name) {
159 mark::hit!(test_gen_enum_match_impl_already_exists);
160 return None;
161 }
162 }
163
164 Some(block)
165}
166
167fn has_fn(imp: &ast::Impl, rhs_name: &str) -> bool {
168 if let Some(il) = imp.assoc_item_list() {
169 for item in il.assoc_items() {
170 if let ast::AssocItem::Fn(f) = item {
171 if let Some(name) = f.name() {
172 if name.text().eq_ignore_ascii_case(rhs_name) {
173 return true;
174 }
175 }
176 }
177 }
178 }
179
180 false
181}
182
183#[cfg(test)] 107#[cfg(test)]
184mod tests { 108mod tests {
185 use ide_db::helpers::FamousDefs;
186 use test_utils::mark; 109 use test_utils::mark;
187 110
188 use crate::tests::{check_assist, check_assist_not_applicable}; 111 use crate::tests::{check_assist, check_assist_not_applicable};
@@ -190,9 +113,7 @@ mod tests {
190 use super::*; 113 use super::*;
191 114
192 fn check_not_applicable(ra_fixture: &str) { 115 fn check_not_applicable(ra_fixture: &str) {
193 let fixture = 116 check_assist_not_applicable(generate_enum_match_method, ra_fixture)
194 format!("//- /main.rs crate:main deps:core\n{}\n{}", ra_fixture, FamousDefs::FIXTURE);
195 check_assist_not_applicable(generate_enum_match_method, &fixture)
196 } 117 }
197 118
198 #[test] 119 #[test]
@@ -221,7 +142,6 @@ impl Variant {
221 142
222 #[test] 143 #[test]
223 fn test_generate_enum_match_already_implemented() { 144 fn test_generate_enum_match_already_implemented() {
224 mark::check!(test_gen_enum_match_impl_already_exists);
225 check_not_applicable( 145 check_not_applicable(
226 r#" 146 r#"
227enum Variant { 147enum Variant {
diff --git a/crates/assists/src/handlers/generate_new.rs b/crates/assists/src/handlers/generate_new.rs
index b7390855a..84832273f 100644
--- a/crates/assists/src/handlers/generate_new.rs
+++ b/crates/assists/src/handlers/generate_new.rs
@@ -1,4 +1,3 @@
1use hir::Adt;
2use itertools::Itertools; 1use itertools::Itertools;
3use stdx::format_to; 2use stdx::format_to;
4use syntax::{ 3use syntax::{
@@ -6,7 +5,7 @@ use syntax::{
6 SmolStr, T, 5 SmolStr, T,
7}; 6};
8 7
9use crate::{AssistContext, AssistId, AssistKind, Assists}; 8use crate::{utils::find_struct_impl, AssistContext, AssistId, AssistKind, Assists};
10 9
11// Assist: generate_new 10// Assist: generate_new
12// 11//
@@ -38,7 +37,7 @@ pub(crate) fn generate_new(acc: &mut Assists, ctx: &AssistContext) -> Option<()>
38 }; 37 };
39 38
40 // Return early if we've found an existing new fn 39 // Return early if we've found an existing new fn
41 let impl_def = find_struct_impl(&ctx, &strukt)?; 40 let impl_def = find_struct_impl(&ctx, &ast::AdtDef::Struct(strukt.clone()), "new")?;
42 41
43 let target = strukt.syntax().text_range(); 42 let target = strukt.syntax().text_range();
44 acc.add(AssistId("generate_new", AssistKind::Generate), "Generate `new`", target, |builder| { 43 acc.add(AssistId("generate_new", AssistKind::Generate), "Generate `new`", target, |builder| {
@@ -111,65 +110,6 @@ fn generate_impl_text(strukt: &ast::Struct, code: &str) -> String {
111 buf 110 buf
112} 111}
113 112
114// Uses a syntax-driven approach to find any impl blocks for the struct that
115// exist within the module/file
116//
117// Returns `None` if we've found an existing `new` fn
118//
119// FIXME: change the new fn checking to a more semantic approach when that's more
120// viable (e.g. we process proc macros, etc)
121fn find_struct_impl(ctx: &AssistContext, strukt: &ast::Struct) -> Option<Option<ast::Impl>> {
122 let db = ctx.db();
123 let module = strukt.syntax().ancestors().find(|node| {
124 ast::Module::can_cast(node.kind()) || ast::SourceFile::can_cast(node.kind())
125 })?;
126
127 let struct_def = ctx.sema.to_def(strukt)?;
128
129 let block = module.descendants().filter_map(ast::Impl::cast).find_map(|impl_blk| {
130 let blk = ctx.sema.to_def(&impl_blk)?;
131
132 // FIXME: handle e.g. `struct S<T>; impl<U> S<U> {}`
133 // (we currently use the wrong type parameter)
134 // also we wouldn't want to use e.g. `impl S<u32>`
135 let same_ty = match blk.target_ty(db).as_adt() {
136 Some(def) => def == Adt::Struct(struct_def),
137 None => false,
138 };
139 let not_trait_impl = blk.target_trait(db).is_none();
140
141 if !(same_ty && not_trait_impl) {
142 None
143 } else {
144 Some(impl_blk)
145 }
146 });
147
148 if let Some(ref impl_blk) = block {
149 if has_new_fn(impl_blk) {
150 return None;
151 }
152 }
153
154 Some(block)
155}
156
157fn has_new_fn(imp: &ast::Impl) -> bool {
158 if let Some(il) = imp.assoc_item_list() {
159 for item in il.assoc_items() {
160 if let ast::AssocItem::Fn(f) = item {
161 if let Some(name) = f.name() {
162 if name.text().eq_ignore_ascii_case("new") {
163 return true;
164 }
165 }
166 }
167 }
168 }
169
170 false
171}
172
173#[cfg(test)] 113#[cfg(test)]
174mod tests { 114mod tests {
175 use crate::tests::{check_assist, check_assist_not_applicable, check_assist_target}; 115 use crate::tests::{check_assist, check_assist_not_applicable, check_assist_target};
diff --git a/crates/assists/src/utils.rs b/crates/assists/src/utils.rs
index 4e762e18b..3842558d8 100644
--- a/crates/assists/src/utils.rs
+++ b/crates/assists/src/utils.rs
@@ -2,7 +2,7 @@
2 2
3use std::ops; 3use std::ops;
4 4
5use hir::HasSource; 5use hir::{Adt, HasSource};
6use ide_db::{helpers::SnippetCap, RootDatabase}; 6use ide_db::{helpers::SnippetCap, RootDatabase};
7use itertools::Itertools; 7use itertools::Itertools;
8use syntax::{ 8use syntax::{
@@ -15,7 +15,10 @@ use syntax::{
15 SyntaxNode, TextSize, T, 15 SyntaxNode, TextSize, T,
16}; 16};
17 17
18use crate::ast_transform::{self, AstTransform, QualifyPaths, SubstituteTypeParams}; 18use crate::{
19 assist_context::AssistContext,
20 ast_transform::{self, AstTransform, QualifyPaths, SubstituteTypeParams},
21};
19 22
20pub(crate) fn unwrap_trivial_block(block: ast::BlockExpr) -> ast::Expr { 23pub(crate) fn unwrap_trivial_block(block: ast::BlockExpr) -> ast::Expr {
21 extract_trivial_expression(&block) 24 extract_trivial_expression(&block)
@@ -267,3 +270,71 @@ pub(crate) fn does_pat_match_variant(pat: &ast::Pat, var: &ast::Pat) -> bool {
267 270
268 pat_head == var_head 271 pat_head == var_head
269} 272}
273
274// Uses a syntax-driven approach to find any impl blocks for the struct that
275// exist within the module/file
276//
277// Returns `None` if we've found an existing `new` fn
278//
279// FIXME: change the new fn checking to a more semantic approach when that's more
280// viable (e.g. we process proc macros, etc)
281pub(crate) fn find_struct_impl(
282 ctx: &AssistContext,
283 strukt: &ast::AdtDef,
284 name: &str,
285) -> Option<Option<ast::Impl>> {
286 let db = ctx.db();
287 let module = strukt.syntax().ancestors().find(|node| {
288 ast::Module::can_cast(node.kind()) || ast::SourceFile::can_cast(node.kind())
289 })?;
290
291 let struct_def = match strukt {
292 ast::AdtDef::Enum(e) => Adt::Enum(ctx.sema.to_def(e)?),
293 ast::AdtDef::Struct(s) => Adt::Struct(ctx.sema.to_def(s)?),
294 ast::AdtDef::Union(u) => Adt::Union(ctx.sema.to_def(u)?),
295 };
296
297 let block = module.descendants().filter_map(ast::Impl::cast).find_map(|impl_blk| {
298 let blk = ctx.sema.to_def(&impl_blk)?;
299
300 // FIXME: handle e.g. `struct S<T>; impl<U> S<U> {}`
301 // (we currently use the wrong type parameter)
302 // also we wouldn't want to use e.g. `impl S<u32>`
303
304 let same_ty = match blk.target_ty(db).as_adt() {
305 Some(def) => def == struct_def,
306 None => false,
307 };
308 let not_trait_impl = blk.target_trait(db).is_none();
309
310 if !(same_ty && not_trait_impl) {
311 None
312 } else {
313 Some(impl_blk)
314 }
315 });
316
317 if let Some(ref impl_blk) = block {
318 if has_fn(impl_blk, name) {
319 return None;
320 }
321 }
322
323 Some(block)
324}
325
326fn has_fn(imp: &ast::Impl, rhs_name: &str) -> bool {
327 if let Some(il) = imp.assoc_item_list() {
328 for item in il.assoc_items() {
329 if let ast::AssocItem::Fn(f) = item {
330 if let Some(name) = f.name() {
331 if name.text().eq_ignore_ascii_case(rhs_name) {
332 return true;
333 }
334 }
335 }
336 }
337 }
338
339 false
340}