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};
31 AstNode, SyntaxKind, TextRange, T,
33 use text_edit::{TextEdit, TextEditBuilder};
37 helpers::node_ext::expr_as_name_ref,
38 search::FileReference,
39 source_change::{FileSystemEdit, SourceChange},
43 pub type Result<T, E = RenameError> = std::result::Result<T, E>;
46 pub struct RenameError(pub String);
48 impl fmt::Display for RenameError {
49 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
50 fmt::Display::fmt(&self.0, f)
55 macro_rules! _format_err {
56 ($fmt:expr) => { RenameError(format!($fmt)) };
57 ($fmt:expr, $($arg:tt)+) => { RenameError(format!($fmt, $($arg)+)) }
59 pub use _format_err as format_err;
63 ($($tokens:tt)*) => { return Err(format_err!($($tokens)*)) }
65 pub use _bail as bail;
68 pub fn rename(&self, sema: &Semantics<RootDatabase>, new_name: &str) -> Result<SourceChange> {
70 Definition::Module(module) => rename_mod(sema, module, new_name),
71 Definition::BuiltinType(_) => {
72 bail!("Cannot rename builtin type")
74 Definition::SelfType(_) => bail!("Cannot rename `Self`"),
75 def => rename_reference(sema, def, new_name),
79 /// Textual range of the identifier which will change when renaming this
80 /// `Definition`. Note that some definitions, like buitin types, can't be
82 pub fn range_for_rename(self, sema: &Semantics<RootDatabase>) -> Option<FileRange> {
83 let res = match self {
84 Definition::Macro(mac) => {
85 let src = mac.source(sema.db)?;
86 let name = match &src.value {
87 Either::Left(it) => it.name()?,
88 Either::Right(it) => it.name()?,
90 src.with_value(name.syntax()).original_file_range_opt(sema.db)
92 Definition::Field(field) => {
93 let src = field.source(sema.db)?;
95 FieldSource::Named(record_field) => {
96 let name = record_field.name()?;
97 src.with_value(name.syntax()).original_file_range_opt(sema.db)
99 FieldSource::Pos(_) => None,
102 Definition::Module(module) => {
103 let src = module.declaration_source(sema.db)?;
104 let name = src.value.name()?;
105 src.with_value(name.syntax()).original_file_range_opt(sema.db)
107 Definition::Function(it) => name_range(it, sema),
108 Definition::Adt(adt) => match adt {
109 hir::Adt::Struct(it) => name_range(it, sema),
110 hir::Adt::Union(it) => name_range(it, sema),
111 hir::Adt::Enum(it) => name_range(it, sema),
113 Definition::Variant(it) => name_range(it, sema),
114 Definition::Const(it) => name_range(it, sema),
115 Definition::Static(it) => name_range(it, sema),
116 Definition::Trait(it) => name_range(it, sema),
117 Definition::TypeAlias(it) => name_range(it, sema),
118 Definition::Local(local) => {
119 let src = local.source(sema.db);
120 let name = match &src.value {
121 Either::Left(bind_pat) => bind_pat.name()?,
122 Either::Right(_) => return None,
124 src.with_value(name.syntax()).original_file_range_opt(sema.db)
126 Definition::GenericParam(generic_param) => match generic_param {
127 hir::GenericParam::TypeParam(type_param) => {
128 let src = type_param.source(sema.db)?;
129 let name = match &src.value {
130 Either::Left(type_param) => type_param.name()?,
131 Either::Right(_trait) => return None,
133 src.with_value(name.syntax()).original_file_range_opt(sema.db)
135 hir::GenericParam::LifetimeParam(lifetime_param) => {
136 let src = lifetime_param.source(sema.db)?;
137 let lifetime = src.value.lifetime()?;
138 src.with_value(lifetime.syntax()).original_file_range_opt(sema.db)
140 hir::GenericParam::ConstParam(it) => name_range(it, sema),
142 Definition::Label(label) => {
143 let src = label.source(sema.db);
144 let lifetime = src.value.lifetime()?;
145 src.with_value(lifetime.syntax()).original_file_range_opt(sema.db)
147 Definition::BuiltinType(_) => return None,
148 Definition::SelfType(_) => return None,
149 Definition::BuiltinAttr(_) => return None,
150 Definition::ToolModule(_) => return None,
154 fn name_range<D>(def: D, sema: &Semantics<RootDatabase>) -> Option<FileRange>
157 D::Ast: ast::HasName,
159 let src = def.source(sema.db)?;
160 let name = src.value.name()?;
161 src.with_value(name.syntax()).original_file_range_opt(sema.db)
167 sema: &Semantics<RootDatabase>,
170 ) -> Result<SourceChange> {
171 if IdentifierKind::classify(new_name)? != IdentifierKind::Ident {
172 bail!("Invalid name `{0}`: cannot rename module to {0}", new_name);
175 let mut source_change = SourceChange::default();
177 let InFile { file_id, value: def_source } = module.definition_source(sema.db);
178 let file_id = file_id.original_file(sema.db);
179 if let ModuleSource::SourceFile(..) = def_source {
180 // mod is defined in path/to/dir/mod.rs
181 let path = if module.is_mod_rs(sema.db) {
182 format!("../{}/mod.rs", new_name)
184 format!("{}.rs", new_name)
186 let dst = AnchoredPathBuf { anchor: file_id, path };
187 let move_file = FileSystemEdit::MoveFile { src: file_id, dst };
188 source_change.push_file_system_edit(move_file);
191 if let Some(InFile { file_id, value: decl_source }) = module.declaration_source(sema.db) {
192 let file_id = file_id.original_file(sema.db);
193 match decl_source.name() {
194 Some(name) => source_change.insert_source_edit(
196 TextEdit::replace(name.syntax().text_range(), new_name.to_string()),
198 _ => never!("Module source node is missing a name"),
201 let def = Definition::Module(module);
202 let usages = def.usages(sema).all();
203 let ref_edits = usages.iter().map(|(&file_id, references)| {
204 (file_id, source_edit_from_references(references, def, new_name))
206 source_change.extend(ref_edits);
212 sema: &Semantics<RootDatabase>,
215 ) -> Result<SourceChange> {
216 let ident_kind = IdentifierKind::classify(new_name)?;
220 Definition::GenericParam(hir::GenericParam::LifetimeParam(_)) | Definition::Label(_)
223 IdentifierKind::Ident | IdentifierKind::Underscore => {
224 cov_mark::hit!(rename_not_a_lifetime_ident_ref);
225 bail!("Invalid name `{}`: not a lifetime identifier", new_name);
227 IdentifierKind::Lifetime => cov_mark::hit!(rename_lifetime),
231 IdentifierKind::Lifetime => {
232 cov_mark::hit!(rename_not_an_ident_ref);
233 bail!("Invalid name `{}`: not an identifier", new_name);
235 IdentifierKind::Ident => cov_mark::hit!(rename_non_local),
236 IdentifierKind::Underscore => (),
240 let assoc_item = match def {
241 // HACK: resolve trait impl items to the item def of the trait definition
242 // so that we properly resolve all trait item references
243 Definition::Function(it) => it.as_assoc_item(sema.db),
244 Definition::TypeAlias(it) => it.as_assoc_item(sema.db),
245 Definition::Const(it) => it.as_assoc_item(sema.db),
248 def = match assoc_item {
250 .containing_trait_impl(sema.db)
252 trait_.items(sema.db).into_iter().find_map(|it| match (it, assoc) {
253 (hir::AssocItem::Function(trait_func), hir::AssocItem::Function(func))
254 if trait_func.name(sema.db) == func.name(sema.db) =>
256 Some(Definition::Function(trait_func))
258 (hir::AssocItem::Const(trait_konst), hir::AssocItem::Const(konst))
259 if trait_konst.name(sema.db) == konst.name(sema.db) =>
261 Some(Definition::Const(trait_konst))
264 hir::AssocItem::TypeAlias(trait_type_alias),
265 hir::AssocItem::TypeAlias(type_alias),
266 ) if trait_type_alias.name(sema.db) == type_alias.name(sema.db) => {
267 Some(Definition::TypeAlias(trait_type_alias))
275 let usages = def.usages(sema).all();
277 if !usages.is_empty() && ident_kind == IdentifierKind::Underscore {
278 cov_mark::hit!(rename_underscore_multiple);
279 bail!("Cannot rename reference to `_` as it is being referenced multiple times");
281 let mut source_change = SourceChange::default();
282 source_change.extend(usages.iter().map(|(&file_id, references)| {
283 (file_id, source_edit_from_references(references, def, new_name))
286 let (file_id, edit) = source_edit_from_def(sema, def, new_name)?;
287 source_change.insert_source_edit(file_id, edit);
291 pub fn source_edit_from_references(
292 references: &[FileReference],
296 let mut edit = TextEdit::builder();
297 // macros can cause multiple refs to occur for the same text range, so keep track of what we have edited so far
298 let mut edited_ranges = Vec::new();
299 for &FileReference { range, ref name, .. } in references {
300 let has_emitted_edit = match name {
301 // if the ranges differ then the node is inside a macro call, we can't really attempt
302 // to make special rewrites like shorthand syntax and such, so just rename the node in
304 ast::NameLike::NameRef(name_ref) if name_ref.syntax().text_range() == range => {
305 source_edit_from_name_ref(&mut edit, name_ref, new_name, def)
307 ast::NameLike::Name(name) if name.syntax().text_range() == range => {
308 source_edit_from_name(&mut edit, name, new_name)
312 if !has_emitted_edit {
313 if !edited_ranges.contains(&range.start()) {
314 edit.replace(range, new_name.to_string());
315 edited_ranges.push(range.start());
323 fn source_edit_from_name(edit: &mut TextEditBuilder, name: &ast::Name, new_name: &str) -> bool {
324 if ast::RecordPatField::for_field_name(name).is_some() {
325 if let Some(ident_pat) = name.syntax().parent().and_then(ast::IdentPat::cast) {
326 cov_mark::hit!(rename_record_pat_field_name_split);
327 // Foo { ref mut field } -> Foo { new_name: ref mut field }
328 // ^ insert `new_name: `
330 // FIXME: instead of splitting the shorthand, recursively trigger a rename of the
331 // other name https://github.com/rust-analyzer/rust-analyzer/issues/6547
332 edit.insert(ident_pat.syntax().text_range().start(), format!("{}: ", new_name));
340 fn source_edit_from_name_ref(
341 edit: &mut TextEditBuilder,
342 name_ref: &ast::NameRef,
346 if let Some(record_field) = ast::RecordExprField::for_name_ref(name_ref) {
347 let rcf_name_ref = record_field.name_ref();
348 let rcf_expr = record_field.expr();
349 match &(rcf_name_ref, rcf_expr.and_then(|it| expr_as_name_ref(&it))) {
350 // field: init-expr, check if we can use a field init shorthand
351 (Some(field_name), Some(init)) => {
352 if field_name == name_ref {
353 if init.text() == new_name {
354 cov_mark::hit!(test_rename_field_put_init_shorthand);
355 // Foo { field: local } -> Foo { local }
356 // ^^^^^^^ delete this
358 // same names, we can use a shorthand here instead.
359 // we do not want to erase attributes hence this range start
360 let s = field_name.syntax().text_range().start();
361 let e = init.syntax().text_range().start();
362 edit.delete(TextRange::new(s, e));
365 } else if init == name_ref {
366 if field_name.text() == new_name {
367 cov_mark::hit!(test_rename_local_put_init_shorthand);
368 // Foo { field: local } -> Foo { field }
369 // ^^^^^^^ delete this
371 // same names, we can use a shorthand here instead.
372 // we do not want to erase attributes hence this range start
373 let s = field_name.syntax().text_range().end();
374 let e = init.syntax().text_range().end();
375 edit.delete(TextRange::new(s, e));
381 (None, Some(_)) if matches!(def, Definition::Field(_)) => {
382 cov_mark::hit!(test_rename_field_in_field_shorthand);
383 // Foo { field } -> Foo { new_name: field }
384 // ^ insert `new_name: `
385 let offset = name_ref.syntax().text_range().start();
386 edit.insert(offset, format!("{}: ", new_name));
389 (None, Some(_)) if matches!(def, Definition::Local(_)) => {
390 cov_mark::hit!(test_rename_local_in_field_shorthand);
391 // Foo { field } -> Foo { field: new_name }
392 // ^ insert `: new_name`
393 let offset = name_ref.syntax().text_range().end();
394 edit.insert(offset, format!(": {}", new_name));
399 } else if let Some(record_field) = ast::RecordPatField::for_field_name_ref(name_ref) {
400 let rcf_name_ref = record_field.name_ref();
401 let rcf_pat = record_field.pat();
402 match (rcf_name_ref, rcf_pat) {
404 (Some(field_name), Some(ast::Pat::IdentPat(pat)))
405 if field_name == *name_ref && pat.at_token().is_none() =>
407 // field name is being renamed
408 if let Some(name) = pat.name() {
409 if name.text() == new_name {
410 cov_mark::hit!(test_rename_field_put_init_shorthand_pat);
411 // Foo { field: ref mut local } -> Foo { ref mut field }
412 // ^^^^^^^ delete this
413 // ^^^^^ replace this with `field`
415 // same names, we can use a shorthand here instead/
416 // we do not want to erase attributes hence this range start
417 let s = field_name.syntax().text_range().start();
418 let e = pat.syntax().text_range().start();
419 edit.delete(TextRange::new(s, e));
420 edit.replace(name.syntax().text_range(), new_name.to_string());
431 fn source_edit_from_def(
432 sema: &Semantics<RootDatabase>,
435 ) -> Result<(FileId, TextEdit)> {
436 let FileRange { file_id, range } = def
437 .range_for_rename(sema)
438 .ok_or_else(|| format_err!("No identifier available to rename"))?;
440 let mut edit = TextEdit::builder();
441 if let Definition::Local(local) = def {
442 if let Either::Left(pat) = local.source(sema.db).value {
443 // special cases required for renaming fields/locals in Record patterns
444 if let Some(pat_field) = pat.syntax().parent().and_then(ast::RecordPatField::cast) {
445 let name_range = pat.name().unwrap().syntax().text_range();
446 if let Some(name_ref) = pat_field.name_ref() {
447 if new_name == name_ref.text() && pat.at_token().is_none() {
448 // Foo { field: ref mut local } -> Foo { ref mut field }
449 // ^^^^^^ delete this
450 // ^^^^^ replace this with `field`
451 cov_mark::hit!(test_rename_local_put_init_shorthand_pat);
456 .cover_offset(pat.syntax().text_range().start()),
458 edit.replace(name_range, name_ref.text().to_string());
460 // Foo { field: ref mut local @ local 2} -> Foo { field: ref mut new_name @ local2 }
461 // Foo { field: ref mut local } -> Foo { field: ref mut new_name }
462 // ^^^^^ replace this with `new_name`
463 edit.replace(name_range, new_name.to_string());
466 // Foo { ref mut field } -> Foo { field: ref mut new_name }
467 // ^ insert `field: `
468 // ^^^^^ replace this with `new_name`
470 pat.syntax().text_range().start(),
471 format!("{}: ", pat_field.field_name().unwrap()),
473 edit.replace(name_range, new_name.to_string());
479 edit.replace(range, new_name.to_string());
481 Ok((file_id, edit.finish()))
484 #[derive(Copy, Clone, Debug, PartialEq)]
485 pub enum IdentifierKind {
491 impl IdentifierKind {
492 pub fn classify(new_name: &str) -> Result<IdentifierKind> {
493 match parser::LexedStr::single_token(new_name) {
494 Some(res) => match res {
495 (SyntaxKind::IDENT, _) => Ok(IdentifierKind::Ident),
496 (T![_], _) => Ok(IdentifierKind::Underscore),
497 (SyntaxKind::LIFETIME_IDENT, _) if new_name != "'static" && new_name != "'_" => {
498 Ok(IdentifierKind::Lifetime)
500 (SyntaxKind::LIFETIME_IDENT, _) => {
501 bail!("Invalid name `{}`: not a lifetime identifier", new_name)
503 (_, Some(syntax_error)) => bail!("Invalid name `{}`: {}", new_name, syntax_error),
504 (_, None) => bail!("Invalid name `{}`: not an identifier", new_name),
506 None => bail!("Invalid name `{}`: not an identifier", new_name),