1 use hir::{HasSource, HirDisplay, InFile};
2 use ide_db::assists::{AssistId, AssistKind};
4 ast::{self, make, HasArgList},
5 match_ast, AstNode, SyntaxNode,
8 use crate::assist_context::{AssistContext, Assists};
10 // Assist: generate_enum_variant
12 // Adds a variant to an enum.
20 // let country = Countries::Lesotho$0;
31 // let country = Countries::Lesotho;
34 pub(crate) fn generate_enum_variant(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
35 let path: ast::Path = ctx.find_node_at_offset()?;
36 let parent = path_parent(&path)?;
38 if ctx.sema.resolve_path(&path).is_some() {
39 // No need to generate anything if the path resolves
43 let name_ref = path.segment()?.name_ref()?;
44 if name_ref.text().starts_with(char::is_lowercase) {
45 // Don't suggest generating variant if the name starts with a lowercase letter
49 if let Some(hir::PathResolution::Def(hir::ModuleDef::Adt(hir::Adt::Enum(e)))) =
50 ctx.sema.resolve_path(&path.qualifier()?)
52 let target = path.syntax().text_range();
53 return add_variant_to_accumulator(acc, ctx, target, e, &name_ref, parent);
61 PathExpr(ast::PathExpr),
62 RecordExpr(ast::RecordExpr),
63 PathPat(ast::PathPat),
64 UseTree(ast::UseTree),
68 fn syntax(&self) -> &SyntaxNode {
70 PathParent::PathExpr(it) => it.syntax(),
71 PathParent::RecordExpr(it) => it.syntax(),
72 PathParent::PathPat(it) => it.syntax(),
73 PathParent::UseTree(it) => it.syntax(),
77 fn make_field_list(&self, ctx: &AssistContext<'_>) -> Option<ast::FieldList> {
78 let scope = ctx.sema.scope(self.syntax())?;
81 PathParent::PathExpr(it) => {
82 if let Some(call_expr) = it.syntax().parent().and_then(ast::CallExpr::cast) {
83 make_tuple_field_list(call_expr, ctx, &scope)
88 PathParent::RecordExpr(it) => make_record_field_list(it, ctx, &scope),
89 PathParent::UseTree(_) | PathParent::PathPat(_) => None,
94 fn path_parent(path: &ast::Path) -> Option<PathParent> {
95 let parent = path.syntax().parent()?;
99 ast::PathExpr(it) => Some(PathParent::PathExpr(it)),
100 ast::RecordExpr(it) => Some(PathParent::RecordExpr(it)),
101 ast::PathPat(it) => Some(PathParent::PathPat(it)),
102 ast::UseTree(it) => Some(PathParent::UseTree(it)),
108 fn add_variant_to_accumulator(
110 ctx: &AssistContext<'_>,
111 target: syntax::TextRange,
113 name_ref: &ast::NameRef,
117 let InFile { file_id, value: enum_node } = adt.source(db)?.original_ast_node(db)?;
120 AssistId("generate_enum_variant", AssistKind::Generate),
124 builder.edit_file(file_id.original_file(db));
125 let node = builder.make_mut(enum_node);
126 let variant = make_variant(ctx, name_ref, parent);
127 node.variant_list().map(|it| it.add_variant(variant.clone_for_update()));
133 ctx: &AssistContext<'_>,
134 name_ref: &ast::NameRef,
137 let field_list = parent.make_field_list(ctx);
138 make::variant(make::name(&name_ref.text()), field_list)
141 fn make_record_field_list(
142 record: &ast::RecordExpr,
143 ctx: &AssistContext<'_>,
144 scope: &hir::SemanticsScope<'_>,
145 ) -> Option<ast::FieldList> {
146 let fields = record.record_expr_field_list()?.fields();
147 let record_fields = fields.map(|field| {
148 let name = name_from_field(&field);
152 .and_then(|it| expr_ty(ctx, it, scope))
153 .unwrap_or_else(make::ty_placeholder);
155 make::record_field(None, name, ty)
157 Some(make::record_field_list(record_fields).into())
160 fn name_from_field(field: &ast::RecordExprField) -> ast::Name {
161 let text = match field.name_ref() {
162 Some(it) => it.to_string(),
163 None => name_from_field_shorthand(field).unwrap_or("unknown".to_string()),
168 fn name_from_field_shorthand(field: &ast::RecordExprField) -> Option<String> {
169 let path = match field.expr()? {
170 ast::Expr::PathExpr(path_expr) => path_expr.path(),
173 Some(path.as_single_name_ref()?.to_string())
176 fn make_tuple_field_list(
177 call_expr: ast::CallExpr,
178 ctx: &AssistContext<'_>,
179 scope: &hir::SemanticsScope<'_>,
180 ) -> Option<ast::FieldList> {
181 let args = call_expr.arg_list()?.args();
182 let tuple_fields = args.map(|arg| {
183 let ty = expr_ty(ctx, arg, &scope).unwrap_or_else(make::ty_placeholder);
184 make::tuple_field(None, ty)
186 Some(make::tuple_field_list(tuple_fields).into())
190 ctx: &AssistContext<'_>,
192 scope: &hir::SemanticsScope<'_>,
193 ) -> Option<ast::Type> {
194 let ty = ctx.sema.type_of_expr(&arg).map(|it| it.adjusted())?;
195 let text = ty.display_source_code(ctx.db(), scope.module().into()).ok()?;
196 Some(make::ty(&text))
201 use crate::tests::{check_assist, check_assist_not_applicable};
206 fn generate_basic_enum_variant_in_empty_enum() {
208 generate_enum_variant,
227 fn generate_basic_enum_variant_in_non_empty_enum() {
229 generate_enum_variant,
251 fn generate_basic_enum_variant_in_different_file() {
253 generate_enum_variant,
278 fn not_applicable_for_existing_variant() {
279 check_assist_not_applicable(
280 generate_enum_variant,
293 fn not_applicable_for_lowercase() {
294 check_assist_not_applicable(
295 generate_enum_variant,
308 fn indentation_level_is_correct() {
310 generate_enum_variant,
336 fn associated_single_element_tuple() {
338 generate_enum_variant,
357 fn associated_single_element_tuple_unknown_type() {
359 generate_enum_variant,
378 fn associated_multi_element_tuple() {
380 generate_enum_variant,
385 Foo::Bar$0(true, x, Struct {})
391 Bar(bool, _, Struct),
394 Foo::Bar(true, x, Struct {})
401 fn associated_record() {
403 generate_enum_variant,
407 Foo::$0Bar { x: true }
422 fn associated_record_unknown_type() {
424 generate_enum_variant,
443 fn associated_record_field_shorthand() {
445 generate_enum_variant,
466 fn associated_record_field_shorthand_unknown_type() {
468 generate_enum_variant,
487 fn associated_record_field_multiple_fields() {
489 generate_enum_variant,
494 Foo::$0Bar { x, y: x, s: Struct {} }
500 Bar { x: _, y: _, s: Struct },
503 Foo::Bar { x, y: x, s: Struct {} }
512 generate_enum_variant,
530 fn not_applicable_for_path_type() {
531 check_assist_not_applicable(
532 generate_enum_variant,
543 generate_enum_variant,