1 //! Rename infrastructure for rust-analyzer. It is used primarily for the
2 //! literal "rename" in the ide (look for tests there), but it is also available
3 //! as a general-purpose service. For example, it is used by the fix for the
4 //! "incorrect case" diagnostic.
6 //! It leverages the [`crate::search`] functionality to find what needs to be
7 //! renamed. The actual renames are tricky -- field shorthands need special
8 //! attention, and, when renaming modules, you also want to rename files on the
11 //! Another can of worms are macros:
14 //! macro_rules! m { () => { fn f() {} } }
17 //! f() // <- rename me
21 //! The correct behavior in such cases is probably to show a dialog to the user.
22 //! Our current behavior is ¯\_(ツ)_/¯.
25 use base_db::{AnchoredPathBuf, FileId, FileRange};
27 use hir::{AsAssocItem, FieldSource, HasSource, InFile, ModuleSource, Semantics};
30 ast::{self, NameOwner},
31 lex_single_syntax_kind, AstNode, SyntaxKind, TextRange, T,
33 use text_edit::TextEdit;
37 search::FileReference,
38 source_change::{FileSystemEdit, SourceChange},
42 pub type Result<T, E = RenameError> = std::result::Result<T, E>;
45 pub struct RenameError(pub String);
47 impl fmt::Display for RenameError {
48 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
49 fmt::Display::fmt(&self.0, f)
54 macro_rules! _format_err {
55 ($fmt:expr) => { RenameError(format!($fmt)) };
56 ($fmt:expr, $($arg:tt)+) => { RenameError(format!($fmt, $($arg)+)) }
58 pub use _format_err as format_err;
62 ($($tokens:tt)*) => { return Err(format_err!($($tokens)*)) }
64 pub use _bail as bail;
67 pub fn rename(&self, sema: &Semantics<RootDatabase>, new_name: &str) -> Result<SourceChange> {
69 Definition::ModuleDef(hir::ModuleDef::Module(module)) => {
70 rename_mod(sema, module, new_name)
72 Definition::ModuleDef(hir::ModuleDef::BuiltinType(_)) => {
73 bail!("Cannot rename builtin type")
75 Definition::SelfType(_) => bail!("Cannot rename `Self`"),
76 def => rename_reference(sema, def, new_name),
80 /// Textual range of the identifier which will change when renaming this
81 /// `Definition`. Note that some definitions, like buitin types, can't be
83 pub fn range_for_rename(self, sema: &Semantics<RootDatabase>) -> Option<FileRange> {
84 // FIXME: the `original_file_range` calls here are wrong -- they never fail,
85 // and _fall back_ to the entirety of the macro call. Such fall back is
86 // incorrect for renames. The safe behavior would be to return an error for
87 // such cases. The correct behavior would be to return an auxiliary list of
88 // "can't rename these occurrences in macros" items, and then show some kind
89 // of a dialog to the user. See:
90 cov_mark::hit!(macros_are_broken_lol);
92 let res = match self {
93 Definition::Macro(mac) => {
94 let src = mac.source(sema.db)?;
95 let name = match &src.value {
96 Either::Left(it) => it.name()?,
97 Either::Right(it) => it.name()?,
99 src.with_value(name.syntax()).original_file_range(sema.db)
101 Definition::Field(field) => {
102 let src = field.source(sema.db)?;
105 FieldSource::Named(record_field) => {
106 let name = record_field.name()?;
107 src.with_value(name.syntax()).original_file_range(sema.db)
109 FieldSource::Pos(_) => {
114 Definition::ModuleDef(module_def) => match module_def {
115 hir::ModuleDef::Module(module) => {
116 let src = module.declaration_source(sema.db)?;
117 let name = src.value.name()?;
118 src.with_value(name.syntax()).original_file_range(sema.db)
120 hir::ModuleDef::Function(it) => name_range(it, sema)?,
121 hir::ModuleDef::Adt(adt) => match adt {
122 hir::Adt::Struct(it) => name_range(it, sema)?,
123 hir::Adt::Union(it) => name_range(it, sema)?,
124 hir::Adt::Enum(it) => name_range(it, sema)?,
126 hir::ModuleDef::Variant(it) => name_range(it, sema)?,
127 hir::ModuleDef::Const(it) => name_range(it, sema)?,
128 hir::ModuleDef::Static(it) => name_range(it, sema)?,
129 hir::ModuleDef::Trait(it) => name_range(it, sema)?,
130 hir::ModuleDef::TypeAlias(it) => name_range(it, sema)?,
131 hir::ModuleDef::BuiltinType(_) => return None,
133 Definition::SelfType(_) => return None,
134 Definition::Local(local) => {
135 let src = local.source(sema.db);
136 let name = match &src.value {
137 Either::Left(bind_pat) => bind_pat.name()?,
138 Either::Right(_) => return None,
140 src.with_value(name.syntax()).original_file_range(sema.db)
142 Definition::GenericParam(generic_param) => match generic_param {
143 hir::GenericParam::TypeParam(type_param) => {
144 let src = type_param.source(sema.db)?;
145 let name = match &src.value {
146 Either::Left(type_param) => type_param.name()?,
147 Either::Right(_trait) => return None,
149 src.with_value(name.syntax()).original_file_range(sema.db)
151 hir::GenericParam::LifetimeParam(lifetime_param) => {
152 let src = lifetime_param.source(sema.db)?;
153 let lifetime = src.value.lifetime()?;
154 src.with_value(lifetime.syntax()).original_file_range(sema.db)
156 hir::GenericParam::ConstParam(it) => name_range(it, sema)?,
158 Definition::Label(label) => {
159 let src = label.source(sema.db);
160 let lifetime = src.value.lifetime()?;
161 src.with_value(lifetime.syntax()).original_file_range(sema.db)
166 fn name_range<D>(def: D, sema: &Semantics<RootDatabase>) -> Option<FileRange>
169 D::Ast: ast::NameOwner,
171 let src = def.source(sema.db)?;
172 let name = src.value.name()?;
173 let res = src.with_value(name.syntax()).original_file_range(sema.db);
180 sema: &Semantics<RootDatabase>,
183 ) -> Result<SourceChange> {
184 if IdentifierKind::classify(new_name)? != IdentifierKind::Ident {
185 bail!("Invalid name `{0}`: cannot rename module to {0}", new_name);
188 let mut source_change = SourceChange::default();
190 let InFile { file_id, value: def_source } = module.definition_source(sema.db);
191 let file_id = file_id.original_file(sema.db);
192 if let ModuleSource::SourceFile(..) = def_source {
193 // mod is defined in path/to/dir/mod.rs
194 let path = if module.is_mod_rs(sema.db) {
195 format!("../{}/mod.rs", new_name)
197 format!("{}.rs", new_name)
199 let dst = AnchoredPathBuf { anchor: file_id, path };
200 let move_file = FileSystemEdit::MoveFile { src: file_id, dst };
201 source_change.push_file_system_edit(move_file);
204 if let Some(InFile { file_id, value: decl_source }) = module.declaration_source(sema.db) {
205 let file_id = file_id.original_file(sema.db);
206 match decl_source.name() {
207 Some(name) => source_change.insert_source_edit(
209 TextEdit::replace(name.syntax().text_range(), new_name.to_string()),
211 _ => never!("Module source node is missing a name"),
214 let def = Definition::ModuleDef(hir::ModuleDef::Module(module));
215 let usages = def.usages(sema).all();
216 let ref_edits = usages.iter().map(|(&file_id, references)| {
217 (file_id, source_edit_from_references(references, def, new_name))
219 source_change.extend(ref_edits);
225 sema: &Semantics<RootDatabase>,
228 ) -> Result<SourceChange> {
229 let ident_kind = IdentifierKind::classify(new_name)?;
233 Definition::GenericParam(hir::GenericParam::LifetimeParam(_)) | Definition::Label(_)
236 IdentifierKind::Ident | IdentifierKind::Underscore => {
237 cov_mark::hit!(rename_not_a_lifetime_ident_ref);
238 bail!("Invalid name `{}`: not a lifetime identifier", new_name);
240 IdentifierKind::Lifetime => cov_mark::hit!(rename_lifetime),
244 IdentifierKind::Lifetime => {
245 cov_mark::hit!(rename_not_an_ident_ref);
246 bail!("Invalid name `{}`: not an identifier", new_name);
248 IdentifierKind::Ident => cov_mark::hit!(rename_non_local),
249 IdentifierKind::Underscore => (),
254 // HACK: resolve trait impl items to the item def of the trait definition
255 // so that we properly resolve all trait item references
256 Definition::ModuleDef(mod_def) => mod_def
257 .as_assoc_item(sema.db)
258 .and_then(|it| it.containing_trait_impl(sema.db))
260 it.items(sema.db).into_iter().find_map(|it| match (it, mod_def) {
261 (hir::AssocItem::Function(trait_func), hir::ModuleDef::Function(func))
262 if trait_func.name(sema.db) == func.name(sema.db) =>
264 Some(Definition::ModuleDef(hir::ModuleDef::Function(trait_func)))
266 (hir::AssocItem::Const(trait_konst), hir::ModuleDef::Const(konst))
267 if trait_konst.name(sema.db) == konst.name(sema.db) =>
269 Some(Definition::ModuleDef(hir::ModuleDef::Const(trait_konst)))
272 hir::AssocItem::TypeAlias(trait_type_alias),
273 hir::ModuleDef::TypeAlias(type_alias),
274 ) if trait_type_alias.name(sema.db) == type_alias.name(sema.db) => {
275 Some(Definition::ModuleDef(hir::ModuleDef::TypeAlias(trait_type_alias)))
283 let usages = def.usages(sema).all();
285 if !usages.is_empty() && ident_kind == IdentifierKind::Underscore {
286 cov_mark::hit!(rename_underscore_multiple);
287 bail!("Cannot rename reference to `_` as it is being referenced multiple times");
289 let mut source_change = SourceChange::default();
290 source_change.extend(usages.iter().map(|(&file_id, references)| {
291 (file_id, source_edit_from_references(references, def, new_name))
294 let (file_id, edit) = source_edit_from_def(sema, def, new_name)?;
295 source_change.insert_source_edit(file_id, edit);
299 pub fn source_edit_from_references(
300 references: &[FileReference],
304 let mut edit = TextEdit::builder();
305 for reference in references {
306 let (range, replacement) = match &reference.name {
307 // if the ranges differ then the node is inside a macro call, we can't really attempt
308 // to make special rewrites like shorthand syntax and such, so just rename the node in
310 ast::NameLike::NameRef(name_ref)
311 if name_ref.syntax().text_range() == reference.range =>
313 source_edit_from_name_ref(name_ref, new_name, def)
315 ast::NameLike::Name(name) if name.syntax().text_range() == reference.range => {
316 source_edit_from_name(name, new_name)
320 .unwrap_or_else(|| (reference.range, new_name.to_string()));
321 edit.replace(range, replacement);
327 fn source_edit_from_name(name: &ast::Name, new_name: &str) -> Option<(TextRange, String)> {
328 if let Some(_) = ast::RecordPatField::for_field_name(name) {
329 if let Some(ident_pat) = name.syntax().parent().and_then(ast::IdentPat::cast) {
330 cov_mark::hit!(rename_record_pat_field_name_split);
331 // Foo { ref mut field } -> Foo { new_name: ref mut field }
332 // ^ insert `new_name: `
334 // FIXME: instead of splitting the shorthand, recursively trigger a rename of the
335 // other name https://github.com/rust-analyzer/rust-analyzer/issues/6547
337 TextRange::empty(ident_pat.syntax().text_range().start()),
338 format!("{}: ", new_name),
346 fn source_edit_from_name_ref(
347 name_ref: &ast::NameRef,
350 ) -> Option<(TextRange, String)> {
351 if let Some(record_field) = ast::RecordExprField::for_name_ref(name_ref) {
352 let rcf_name_ref = record_field.name_ref();
353 let rcf_expr = record_field.expr();
354 match &(rcf_name_ref, rcf_expr.and_then(|it| it.name_ref())) {
355 // field: init-expr, check if we can use a field init shorthand
356 (Some(field_name), Some(init)) => {
357 if field_name == name_ref {
358 if init.text() == new_name {
359 cov_mark::hit!(test_rename_field_put_init_shorthand);
360 // Foo { field: local } -> Foo { local }
361 // ^^^^^^^^ delete this
362 // FIXME: Actually delete this instead of replacing the entire thing
364 // same names, we can use a shorthand here instead.
365 // we do not want to erase attributes hence this range start
366 let s = field_name.syntax().text_range().start();
367 let e = record_field.syntax().text_range().end();
368 return Some((TextRange::new(s, e), new_name.to_owned()));
370 } else if init == name_ref {
371 if field_name.text() == new_name {
372 cov_mark::hit!(test_rename_local_put_init_shorthand);
373 // Foo { field: local } -> Foo { field }
374 // ^^^^^^^ delete this
375 // FIXME: Actually delete this instead of replacing the entire thing
377 // same names, we can use a shorthand here instead.
378 // we do not want to erase attributes hence this range start
379 let s = field_name.syntax().text_range().start();
380 let e = record_field.syntax().text_range().end();
381 return Some((TextRange::new(s, e), new_name.to_owned()));
387 (None, Some(_)) if matches!(def, Definition::Field(_)) => {
388 cov_mark::hit!(test_rename_field_in_field_shorthand);
389 // Foo { field } -> Foo { new_name: field }
390 // ^ insert `new_name: `
391 let s = name_ref.syntax().text_range().start();
392 Some((TextRange::empty(s), format!("{}: ", new_name)))
394 (None, Some(_)) if matches!(def, Definition::Local(_)) => {
395 cov_mark::hit!(test_rename_local_in_field_shorthand);
396 // Foo { field } -> Foo { field: new_name }
397 // ^ insert `: new_name`
398 let s = name_ref.syntax().text_range().end();
399 Some((TextRange::empty(s), format!(": {}", new_name)))
403 } else if let Some(record_field) = ast::RecordPatField::for_field_name_ref(name_ref) {
404 let rcf_name_ref = record_field.name_ref();
405 let rcf_pat = record_field.pat();
406 match (rcf_name_ref, rcf_pat) {
408 (Some(field_name), Some(ast::Pat::IdentPat(pat)))
409 if field_name == *name_ref && pat.at_token().is_none() =>
411 // field name is being renamed
412 if pat.name().map_or(false, |it| it.text() == new_name) {
413 cov_mark::hit!(test_rename_field_put_init_shorthand_pat);
414 // Foo { field: ref mut local } -> Foo { ref mut field }
415 // ^^^^^^^ delete this
416 // ^^^^^ replace this with `field`
417 // FIXME: do this the way its written here
419 // same names, we can use a shorthand here instead/
420 // we do not want to erase attributes hence this range start
421 let s = field_name.syntax().text_range().start();
422 let e = record_field.syntax().text_range().end();
423 Some((TextRange::new(s, e), pat.to_string()))
435 fn source_edit_from_def(
436 sema: &Semantics<RootDatabase>,
439 ) -> Result<(FileId, TextEdit)> {
440 let FileRange { file_id, range } = def
441 .range_for_rename(sema)
442 .ok_or_else(|| format_err!("No identifier available to rename"))?;
444 let mut edit = TextEdit::builder();
445 if let Definition::Local(local) = def {
446 if let Either::Left(pat) = local.source(sema.db).value {
447 // special cases required for renaming fields/locals in Record patterns
448 if let Some(pat_field) = pat.syntax().parent().and_then(ast::RecordPatField::cast) {
449 let name_range = pat.name().unwrap().syntax().text_range();
450 if let Some(name_ref) = pat_field.name_ref() {
451 if new_name == name_ref.text() && pat.at_token().is_none() {
452 // Foo { field: ref mut local } -> Foo { ref mut field }
453 // ^^^^^^ delete this
454 // ^^^^^ replace this with `field`
455 cov_mark::hit!(test_rename_local_put_init_shorthand_pat);
460 .cover_offset(pat.syntax().text_range().start()),
462 edit.replace(name_range, name_ref.text().to_string());
464 // Foo { field: ref mut local @ local 2} -> Foo { field: ref mut new_name @ local2 }
465 // Foo { field: ref mut local } -> Foo { field: ref mut new_name }
466 // ^^^^^ replace this with `new_name`
467 edit.replace(name_range, new_name.to_string());
470 // Foo { ref mut field } -> Foo { field: ref mut new_name }
471 // ^ insert `field: `
472 // ^^^^^ replace this with `new_name`
474 pat.syntax().text_range().start(),
475 format!("{}: ", pat_field.field_name().unwrap()),
477 edit.replace(name_range, new_name.to_string());
483 edit.replace(range, new_name.to_string());
485 Ok((file_id, edit.finish()))
488 #[derive(Copy, Clone, Debug, PartialEq)]
489 pub enum IdentifierKind {
495 impl IdentifierKind {
496 pub fn classify(new_name: &str) -> Result<IdentifierKind> {
497 match lex_single_syntax_kind(new_name) {
498 Some(res) => match res {
499 (SyntaxKind::IDENT, _) => Ok(IdentifierKind::Ident),
500 (T![_], _) => Ok(IdentifierKind::Underscore),
501 (SyntaxKind::LIFETIME_IDENT, _) if new_name != "'static" && new_name != "'_" => {
502 Ok(IdentifierKind::Lifetime)
504 (SyntaxKind::LIFETIME_IDENT, _) => {
505 bail!("Invalid name `{}`: not a lifetime identifier", new_name)
507 (_, Some(syntax_error)) => bail!("Invalid name `{}`: {}", new_name, syntax_error),
508 (_, None) => bail!("Invalid name `{}`: not an identifier", new_name),
510 None => bail!("Invalid name `{}`: not an identifier", new_name),