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::LifetimeParam(lifetime_param) => {
128 let src = lifetime_param.source(sema.db)?;
129 src.with_value(src.value.lifetime()?.syntax()).original_file_range_opt(sema.db)
132 let x = match generic_param {
133 hir::GenericParam::TypeParam(it) => it.merge(),
134 hir::GenericParam::ConstParam(it) => it.merge(),
135 hir::GenericParam::LifetimeParam(_) => return None,
137 let src = x.source(sema.db)?;
138 let name = match &src.value {
139 Either::Left(x) => x.name()?,
140 Either::Right(_) => return None,
142 src.with_value(name.syntax()).original_file_range_opt(sema.db)
145 Definition::Label(label) => {
146 let src = label.source(sema.db);
147 let lifetime = src.value.lifetime()?;
148 src.with_value(lifetime.syntax()).original_file_range_opt(sema.db)
150 Definition::BuiltinType(_) => return None,
151 Definition::SelfType(_) => return None,
152 Definition::BuiltinAttr(_) => return None,
153 Definition::ToolModule(_) => return None,
157 fn name_range<D>(def: D, sema: &Semantics<RootDatabase>) -> Option<FileRange>
160 D::Ast: ast::HasName,
162 let src = def.source(sema.db)?;
163 let name = src.value.name()?;
164 src.with_value(name.syntax()).original_file_range_opt(sema.db)
170 sema: &Semantics<RootDatabase>,
173 ) -> Result<SourceChange> {
174 if IdentifierKind::classify(new_name)? != IdentifierKind::Ident {
175 bail!("Invalid name `{0}`: cannot rename module to {0}", new_name);
178 let mut source_change = SourceChange::default();
180 let InFile { file_id, value: def_source } = module.definition_source(sema.db);
181 let file_id = file_id.original_file(sema.db);
182 if let ModuleSource::SourceFile(..) = def_source {
183 // mod is defined in path/to/dir/mod.rs
184 let path = if module.is_mod_rs(sema.db) {
185 format!("../{}/mod.rs", new_name)
187 format!("{}.rs", new_name)
189 let dst = AnchoredPathBuf { anchor: file_id, path };
190 let move_file = FileSystemEdit::MoveFile { src: file_id, dst };
191 source_change.push_file_system_edit(move_file);
194 if let Some(src) = module.declaration_source(sema.db) {
195 let file_id = src.file_id.original_file(sema.db);
196 match src.value.name() {
198 if let Some(file_range) =
199 src.with_value(name.syntax()).original_file_range_opt(sema.db)
201 source_change.insert_source_edit(
203 TextEdit::replace(file_range.range, new_name.to_string()),
207 _ => never!("Module source node is missing a name"),
211 let def = Definition::Module(module);
212 let usages = def.usages(sema).all();
213 let ref_edits = usages.iter().map(|(&file_id, references)| {
214 (file_id, source_edit_from_references(references, def, new_name))
216 source_change.extend(ref_edits);
222 sema: &Semantics<RootDatabase>,
225 ) -> Result<SourceChange> {
226 let ident_kind = IdentifierKind::classify(new_name)?;
230 Definition::GenericParam(hir::GenericParam::LifetimeParam(_)) | Definition::Label(_)
233 IdentifierKind::Ident | IdentifierKind::Underscore => {
234 cov_mark::hit!(rename_not_a_lifetime_ident_ref);
235 bail!("Invalid name `{}`: not a lifetime identifier", new_name);
237 IdentifierKind::Lifetime => cov_mark::hit!(rename_lifetime),
241 IdentifierKind::Lifetime => {
242 cov_mark::hit!(rename_not_an_ident_ref);
243 bail!("Invalid name `{}`: not an identifier", new_name);
245 IdentifierKind::Ident => cov_mark::hit!(rename_non_local),
246 IdentifierKind::Underscore => (),
250 let assoc_item = match def {
251 // HACK: resolve trait impl items to the item def of the trait definition
252 // so that we properly resolve all trait item references
253 Definition::Function(it) => it.as_assoc_item(sema.db),
254 Definition::TypeAlias(it) => it.as_assoc_item(sema.db),
255 Definition::Const(it) => it.as_assoc_item(sema.db),
258 def = match assoc_item {
260 .containing_trait_impl(sema.db)
262 trait_.items(sema.db).into_iter().find_map(|it| match (it, assoc) {
263 (hir::AssocItem::Function(trait_func), hir::AssocItem::Function(func))
264 if trait_func.name(sema.db) == func.name(sema.db) =>
266 Some(Definition::Function(trait_func))
268 (hir::AssocItem::Const(trait_konst), hir::AssocItem::Const(konst))
269 if trait_konst.name(sema.db) == konst.name(sema.db) =>
271 Some(Definition::Const(trait_konst))
274 hir::AssocItem::TypeAlias(trait_type_alias),
275 hir::AssocItem::TypeAlias(type_alias),
276 ) if trait_type_alias.name(sema.db) == type_alias.name(sema.db) => {
277 Some(Definition::TypeAlias(trait_type_alias))
285 let usages = def.usages(sema).all();
287 if !usages.is_empty() && ident_kind == IdentifierKind::Underscore {
288 cov_mark::hit!(rename_underscore_multiple);
289 bail!("Cannot rename reference to `_` as it is being referenced multiple times");
291 let mut source_change = SourceChange::default();
292 source_change.extend(usages.iter().map(|(&file_id, references)| {
293 (file_id, source_edit_from_references(references, def, new_name))
296 let mut insert_def_edit = |def| {
297 let (file_id, edit) = source_edit_from_def(sema, def, new_name)?;
298 source_change.insert_source_edit(file_id, edit);
302 Definition::Local(l) => l
303 .associated_locals(sema.db)
305 .try_for_each(|&local| insert_def_edit(Definition::Local(local))),
306 def => insert_def_edit(def),
311 pub fn source_edit_from_references(
312 references: &[FileReference],
316 let mut edit = TextEdit::builder();
317 // macros can cause multiple refs to occur for the same text range, so keep track of what we have edited so far
318 let mut edited_ranges = Vec::new();
319 for &FileReference { range, ref name, .. } in references {
320 let has_emitted_edit = match name {
321 // if the ranges differ then the node is inside a macro call, we can't really attempt
322 // to make special rewrites like shorthand syntax and such, so just rename the node in
324 ast::NameLike::NameRef(name_ref) if name_ref.syntax().text_range() == range => {
325 source_edit_from_name_ref(&mut edit, name_ref, new_name, def)
327 ast::NameLike::Name(name) if name.syntax().text_range() == range => {
328 source_edit_from_name(&mut edit, name, new_name)
332 if !has_emitted_edit {
333 if !edited_ranges.contains(&range.start()) {
334 edit.replace(range, new_name.to_string());
335 edited_ranges.push(range.start());
343 fn source_edit_from_name(edit: &mut TextEditBuilder, name: &ast::Name, new_name: &str) -> bool {
344 if ast::RecordPatField::for_field_name(name).is_some() {
345 if let Some(ident_pat) = name.syntax().parent().and_then(ast::IdentPat::cast) {
346 cov_mark::hit!(rename_record_pat_field_name_split);
347 // Foo { ref mut field } -> Foo { new_name: ref mut field }
348 // ^ insert `new_name: `
350 // FIXME: instead of splitting the shorthand, recursively trigger a rename of the
351 // other name https://github.com/rust-analyzer/rust-analyzer/issues/6547
352 edit.insert(ident_pat.syntax().text_range().start(), format!("{}: ", new_name));
360 fn source_edit_from_name_ref(
361 edit: &mut TextEditBuilder,
362 name_ref: &ast::NameRef,
366 if name_ref.super_token().is_some() {
370 if let Some(record_field) = ast::RecordExprField::for_name_ref(name_ref) {
371 let rcf_name_ref = record_field.name_ref();
372 let rcf_expr = record_field.expr();
373 match &(rcf_name_ref, rcf_expr.and_then(|it| expr_as_name_ref(&it))) {
374 // field: init-expr, check if we can use a field init shorthand
375 (Some(field_name), Some(init)) => {
376 if field_name == name_ref {
377 if init.text() == new_name {
378 cov_mark::hit!(test_rename_field_put_init_shorthand);
379 // Foo { field: local } -> Foo { local }
380 // ^^^^^^^ delete this
382 // same names, we can use a shorthand here instead.
383 // we do not want to erase attributes hence this range start
384 let s = field_name.syntax().text_range().start();
385 let e = init.syntax().text_range().start();
386 edit.delete(TextRange::new(s, e));
389 } else if init == name_ref {
390 if field_name.text() == new_name {
391 cov_mark::hit!(test_rename_local_put_init_shorthand);
392 // Foo { field: local } -> Foo { field }
393 // ^^^^^^^ delete this
395 // same names, we can use a shorthand here instead.
396 // we do not want to erase attributes hence this range start
397 let s = field_name.syntax().text_range().end();
398 let e = init.syntax().text_range().end();
399 edit.delete(TextRange::new(s, e));
405 (None, Some(_)) if matches!(def, Definition::Field(_)) => {
406 cov_mark::hit!(test_rename_field_in_field_shorthand);
407 // Foo { field } -> Foo { new_name: field }
408 // ^ insert `new_name: `
409 let offset = name_ref.syntax().text_range().start();
410 edit.insert(offset, format!("{}: ", new_name));
413 (None, Some(_)) if matches!(def, Definition::Local(_)) => {
414 cov_mark::hit!(test_rename_local_in_field_shorthand);
415 // Foo { field } -> Foo { field: new_name }
416 // ^ insert `: new_name`
417 let offset = name_ref.syntax().text_range().end();
418 edit.insert(offset, format!(": {}", new_name));
423 } else if let Some(record_field) = ast::RecordPatField::for_field_name_ref(name_ref) {
424 let rcf_name_ref = record_field.name_ref();
425 let rcf_pat = record_field.pat();
426 match (rcf_name_ref, rcf_pat) {
428 (Some(field_name), Some(ast::Pat::IdentPat(pat)))
429 if field_name == *name_ref && pat.at_token().is_none() =>
431 // field name is being renamed
432 if let Some(name) = pat.name() {
433 if name.text() == new_name {
434 cov_mark::hit!(test_rename_field_put_init_shorthand_pat);
435 // Foo { field: ref mut local } -> Foo { ref mut field }
436 // ^^^^^^^ delete this
437 // ^^^^^ replace this with `field`
439 // same names, we can use a shorthand here instead/
440 // we do not want to erase attributes hence this range start
441 let s = field_name.syntax().text_range().start();
442 let e = pat.syntax().text_range().start();
443 edit.delete(TextRange::new(s, e));
444 edit.replace(name.syntax().text_range(), new_name.to_string());
455 fn source_edit_from_def(
456 sema: &Semantics<RootDatabase>,
459 ) -> Result<(FileId, TextEdit)> {
460 let FileRange { file_id, range } = def
461 .range_for_rename(sema)
462 .ok_or_else(|| format_err!("No identifier available to rename"))?;
464 let mut edit = TextEdit::builder();
465 if let Definition::Local(local) = def {
466 if let Either::Left(pat) = local.source(sema.db).value {
467 // special cases required for renaming fields/locals in Record patterns
468 if let Some(pat_field) = pat.syntax().parent().and_then(ast::RecordPatField::cast) {
469 let name_range = pat.name().unwrap().syntax().text_range();
470 if let Some(name_ref) = pat_field.name_ref() {
471 if new_name == name_ref.text() && pat.at_token().is_none() {
472 // Foo { field: ref mut local } -> Foo { ref mut field }
473 // ^^^^^^ delete this
474 // ^^^^^ replace this with `field`
475 cov_mark::hit!(test_rename_local_put_init_shorthand_pat);
480 .cover_offset(pat.syntax().text_range().start()),
482 edit.replace(name_range, name_ref.text().to_string());
484 // Foo { field: ref mut local @ local 2} -> Foo { field: ref mut new_name @ local2 }
485 // Foo { field: ref mut local } -> Foo { field: ref mut new_name }
486 // ^^^^^ replace this with `new_name`
487 edit.replace(name_range, new_name.to_string());
490 // Foo { ref mut field } -> Foo { field: ref mut new_name }
491 // ^ insert `field: `
492 // ^^^^^ replace this with `new_name`
494 pat.syntax().text_range().start(),
495 format!("{}: ", pat_field.field_name().unwrap()),
497 edit.replace(name_range, new_name.to_string());
503 edit.replace(range, new_name.to_string());
505 Ok((file_id, edit.finish()))
508 #[derive(Copy, Clone, Debug, PartialEq)]
509 pub enum IdentifierKind {
515 impl IdentifierKind {
516 pub fn classify(new_name: &str) -> Result<IdentifierKind> {
517 match parser::LexedStr::single_token(new_name) {
518 Some(res) => match res {
519 (SyntaxKind::IDENT, _) => Ok(IdentifierKind::Ident),
520 (T![_], _) => Ok(IdentifierKind::Underscore),
521 (SyntaxKind::LIFETIME_IDENT, _) if new_name != "'static" && new_name != "'_" => {
522 Ok(IdentifierKind::Lifetime)
524 (SyntaxKind::LIFETIME_IDENT, _) => {
525 bail!("Invalid name `{}`: not a lifetime identifier", new_name)
527 (_, Some(syntax_error)) => bail!("Invalid name `{}`: {}", new_name, syntax_error),
528 (_, None) => bail!("Invalid name `{}`: not an identifier", new_name),
530 None => bail!("Invalid name `{}`: not an identifier", new_name),