1 //! See `CompletionContext` structure.
3 use base_db::SourceDatabaseExt;
4 use hir::{Local, Name, ScopeDef, Semantics, SemanticsScope, Type, TypeInfo};
6 active_parameter::ActiveParameter,
7 base_db::{FilePosition, SourceDatabase},
11 algo::find_node_at_offset,
12 ast::{self, HasName, NameOrNameRef},
13 match_ast, AstNode, NodeOrToken,
14 SyntaxKind::{self, *},
15 SyntaxNode, SyntaxToken, TextRange, TextSize, T,
21 determine_location, determine_prev_sibling, for_is_prev2, inside_impl_trait_block,
22 is_in_loop_body, previous_token, ImmediateLocation, ImmediatePrevSibling,
27 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
28 pub(crate) enum PatternRefutability {
33 #[derive(Copy, Clone, Debug)]
34 pub(super) enum PathKind {
40 Vis { has_in_token: bool },
45 pub(crate) struct PathCompletionContext {
46 /// If this is a call with () already there
47 has_call_parens: bool,
48 /// A single-indent path, like `foo`. `::foo` should not be considered a trivial path.
49 pub(super) is_trivial_path: bool,
50 /// If not a trivial path, the prefix (qualifier).
51 pub(super) qualifier: Option<ast::Path>,
53 /// If not a trivial path, the suffix (parent).
54 pub(super) parent: Option<ast::Path>,
55 /// Whether the qualifier comes from a use tree parent or not
56 pub(super) use_tree_parent: bool,
57 pub(super) kind: Option<PathKind>,
58 /// Whether the path segment has type args or not.
59 pub(super) has_type_args: bool,
60 /// `true` if we are a statement or a last expr in the block.
61 pub(super) can_be_stmt: bool,
62 pub(super) in_loop_body: bool,
66 pub(super) struct PatternContext {
67 pub(super) refutability: PatternRefutability,
68 pub(super) is_param: Option<ParamKind>,
69 pub(super) has_type_ascription: bool,
73 pub(super) enum LifetimeContext {
74 LifetimeParam(Option<ast::LifetimeParam>),
80 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
81 pub(crate) enum ParamKind {
85 /// `CompletionContext` is created early during completion to figure out, where
86 /// exactly is the cursor, syntax-wise.
88 pub(crate) struct CompletionContext<'a> {
89 pub(super) sema: Semantics<'a, RootDatabase>,
90 pub(super) scope: SemanticsScope<'a>,
91 pub(super) db: &'a RootDatabase,
92 pub(super) config: &'a CompletionConfig,
93 pub(super) position: FilePosition,
94 /// The token before the cursor, in the original file.
95 pub(super) original_token: SyntaxToken,
96 /// The token before the cursor, in the macro-expanded file.
97 pub(super) token: SyntaxToken,
98 /// The crate of the current file.
99 pub(super) krate: Option<hir::Crate>,
100 pub(super) expected_name: Option<NameOrNameRef>,
101 pub(super) expected_type: Option<Type>,
103 /// The parent function of the cursor position if it exists.
104 pub(super) function_def: Option<ast::Fn>,
105 /// The parent impl of the cursor position if it exists.
106 pub(super) impl_def: Option<ast::Impl>,
107 /// The NameLike under the cursor in the original file if it exists.
108 pub(super) name_syntax: Option<ast::NameLike>,
109 pub(super) incomplete_let: bool,
111 pub(super) completion_location: Option<ImmediateLocation>,
112 pub(super) prev_sibling: Option<ImmediatePrevSibling>,
113 pub(super) attribute_under_caret: Option<ast::Attr>,
114 pub(super) previous_token: Option<SyntaxToken>,
116 pub(super) lifetime_ctx: Option<LifetimeContext>,
117 pub(super) pattern_ctx: Option<PatternContext>,
118 pub(super) path_context: Option<PathCompletionContext>,
119 pub(super) locals: Vec<(Name, Local)>,
121 no_completion_required: bool,
124 impl<'a> CompletionContext<'a> {
125 /// Checks whether completions in that particular case don't make much sense.
127 /// - `fn $0` -- we expect function name, it's unlikely that "hint" will be helpful.
128 /// Exception for this case is `impl Trait for Foo`, where we would like to hint trait method names.
129 /// - `for _ i$0` -- obviously, it'll be "in" keyword.
130 pub(crate) fn no_completion_required(&self) -> bool {
131 self.no_completion_required
134 /// The range of the identifier that is being completed.
135 pub(crate) fn source_range(&self) -> TextRange {
136 // check kind of macro-expanded token, but use range of original token
137 let kind = self.token.kind();
138 if kind == IDENT || kind == LIFETIME_IDENT || kind == UNDERSCORE || kind.is_keyword() {
139 self.original_token.text_range()
140 } else if kind == CHAR {
141 // assume we are completing a lifetime but the user has only typed the '
142 cov_mark::hit!(completes_if_lifetime_without_idents);
143 TextRange::at(self.original_token.text_range().start(), TextSize::from(1))
145 TextRange::empty(self.position.offset)
149 pub(crate) fn previous_token_is(&self, kind: SyntaxKind) -> bool {
150 self.previous_token.as_ref().map_or(false, |tok| tok.kind() == kind)
153 pub(crate) fn dot_receiver(&self) -> Option<&ast::Expr> {
154 match &self.completion_location {
156 ImmediateLocation::MethodCall { receiver, .. }
157 | ImmediateLocation::FieldAccess { receiver, .. },
158 ) => receiver.as_ref(),
163 pub(crate) fn has_dot_receiver(&self) -> bool {
165 &self.completion_location,
166 Some(ImmediateLocation::FieldAccess { receiver, .. } | ImmediateLocation::MethodCall { receiver,.. })
167 if receiver.is_some()
171 pub(crate) fn expects_assoc_item(&self) -> bool {
172 matches!(self.completion_location, Some(ImmediateLocation::Trait | ImmediateLocation::Impl))
175 pub(crate) fn expects_variant(&self) -> bool {
176 matches!(self.completion_location, Some(ImmediateLocation::Variant))
179 pub(crate) fn expects_non_trait_assoc_item(&self) -> bool {
180 matches!(self.completion_location, Some(ImmediateLocation::Impl))
183 pub(crate) fn expects_item(&self) -> bool {
184 matches!(self.completion_location, Some(ImmediateLocation::ItemList))
187 pub(crate) fn expects_generic_arg(&self) -> bool {
188 matches!(self.completion_location, Some(ImmediateLocation::GenericArgList(_)))
191 pub(crate) fn has_block_expr_parent(&self) -> bool {
192 matches!(self.completion_location, Some(ImmediateLocation::StmtList))
195 pub(crate) fn expects_ident_pat_or_ref_expr(&self) -> bool {
197 self.completion_location,
198 Some(ImmediateLocation::IdentPat | ImmediateLocation::RefExpr)
202 pub(crate) fn expect_field(&self) -> bool {
204 self.completion_location,
205 Some(ImmediateLocation::RecordField | ImmediateLocation::TupleField)
209 pub(crate) fn has_impl_or_trait_prev_sibling(&self) -> bool {
212 Some(ImmediatePrevSibling::ImplDefType | ImmediatePrevSibling::TraitDefName)
216 pub(crate) fn has_impl_prev_sibling(&self) -> bool {
217 matches!(self.prev_sibling, Some(ImmediatePrevSibling::ImplDefType))
220 pub(crate) fn has_visibility_prev_sibling(&self) -> bool {
221 matches!(self.prev_sibling, Some(ImmediatePrevSibling::Visibility))
224 pub(crate) fn after_if(&self) -> bool {
225 matches!(self.prev_sibling, Some(ImmediatePrevSibling::IfExpr))
228 pub(crate) fn is_path_disallowed(&self) -> bool {
229 self.previous_token_is(T![unsafe])
232 Some(ImmediatePrevSibling::Attribute | ImmediatePrevSibling::Visibility)
235 self.completion_location,
237 ImmediateLocation::ModDeclaration(_)
238 | ImmediateLocation::RecordPat(_)
239 | ImmediateLocation::RecordExpr(_)
240 | ImmediateLocation::Rename
245 pub(crate) fn expects_expression(&self) -> bool {
246 matches!(self.path_context, Some(PathCompletionContext { kind: Some(PathKind::Expr), .. }))
249 pub(crate) fn expects_type(&self) -> bool {
250 matches!(self.path_context, Some(PathCompletionContext { kind: Some(PathKind::Type), .. }))
253 pub(crate) fn path_is_call(&self) -> bool {
254 self.path_context.as_ref().map_or(false, |it| it.has_call_parens)
257 pub(crate) fn is_trivial_path(&self) -> bool {
258 matches!(self.path_context, Some(PathCompletionContext { is_trivial_path: true, .. }))
261 pub(crate) fn is_non_trivial_path(&self) -> bool {
262 matches!(self.path_context, Some(PathCompletionContext { is_trivial_path: false, .. }))
265 pub(crate) fn path_qual(&self) -> Option<&ast::Path> {
266 self.path_context.as_ref().and_then(|it| it.qualifier.as_ref())
269 pub(crate) fn path_kind(&self) -> Option<PathKind> {
270 self.path_context.as_ref().and_then(|it| it.kind)
273 /// Checks if an item is visible and not `doc(hidden)` at the completion site.
274 pub(crate) fn is_visible<I>(&self, item: &I) -> bool
276 I: hir::HasVisibility + hir::HasAttrs + hir::HasCrate + Copy,
278 self.is_visible_impl(&item.visibility(self.db), &item.attrs(self.db), item.krate(self.db))
281 pub(crate) fn is_scope_def_hidden(&self, scope_def: &ScopeDef) -> bool {
282 if let (Some(attrs), Some(krate)) = (scope_def.attrs(self.db), scope_def.krate(self.db)) {
283 return self.is_doc_hidden(&attrs, krate);
289 /// Check if an item is `#[doc(hidden)]`.
290 pub(crate) fn is_item_hidden(&self, item: &hir::ItemInNs) -> bool {
291 let attrs = item.attrs(self.db);
292 let krate = item.krate(self.db);
293 match (attrs, krate) {
294 (Some(attrs), Some(krate)) => self.is_doc_hidden(&attrs, krate),
299 pub(crate) fn is_immediately_after_macro_bang(&self) -> bool {
300 self.token.kind() == BANG && self.token.parent().map_or(false, |it| it.kind() == MACRO_CALL)
303 /// A version of [`SemanticsScope::process_all_names`] that filters out `#[doc(hidden)]` items.
304 pub(crate) fn process_all_names(&self, f: &mut dyn FnMut(Name, ScopeDef)) {
305 self.scope.process_all_names(&mut |name, def| {
306 if self.is_scope_def_hidden(&def) {
316 vis: &hir::Visibility,
318 defining_crate: hir::Crate,
320 let module = match self.scope.module() {
322 None => return false,
324 if !vis.is_visible_from(self.db, module.into()) {
325 // If the definition location is editable, also show private items
326 let root_file = defining_crate.root_file(self.db);
327 let source_root_id = self.db.file_source_root(root_file);
328 let is_editable = !self.db.source_root(source_root_id).is_library;
332 !self.is_doc_hidden(attrs, defining_crate)
335 fn is_doc_hidden(&self, attrs: &hir::Attrs, defining_crate: hir::Crate) -> bool {
336 let krate = match self.krate {
340 if krate != defining_crate && attrs.has_doc_hidden() {
341 // `doc(hidden)` items are only completed within the defining crate.
349 // CompletionContext construction
350 impl<'a> CompletionContext<'a> {
352 db: &'a RootDatabase,
353 position @ FilePosition { file_id, offset }: FilePosition,
354 config: &'a CompletionConfig,
355 ) -> Option<CompletionContext<'a>> {
356 let _p = profile::span("CompletionContext::new");
357 let sema = Semantics::new(db);
359 let original_file = sema.parse(file_id);
361 // Insert a fake ident to get a valid parse tree. We will use this file
362 // to determine context, though the original_file will be used for
363 // actual completion.
364 let file_with_fake_ident = {
365 let parse = db.parse(file_id);
366 let edit = Indel::insert(offset, "intellijRulezz".to_string());
367 parse.reparse(&edit).tree()
369 let fake_ident_token =
370 file_with_fake_ident.syntax().token_at_offset(offset).right_biased().unwrap();
372 let original_token = original_file.syntax().token_at_offset(offset).left_biased()?;
373 let token = sema.descend_into_macros_single(original_token.clone());
374 let scope = sema.scope_at_offset(&token, offset);
375 let krate = scope.krate();
376 let mut locals = vec![];
377 scope.process_all_names(&mut |name, scope| {
378 if let ScopeDef::Local(local) = scope {
379 locals.push((name, local));
382 let mut ctx = CompletionContext {
398 completion_location: None,
400 attribute_under_caret: None,
401 previous_token: None,
404 incomplete_let: false,
405 no_completion_required: false,
408 original_file.syntax().clone(),
409 file_with_fake_ident.syntax().clone(),
416 /// Do the attribute expansion at the current cursor position for both original file and fake file
417 /// as long as possible. As soon as one of the two expansions fail we stop to stay in sync.
420 mut original_file: SyntaxNode,
421 mut speculative_file: SyntaxNode,
422 mut offset: TextSize,
423 mut fake_ident_token: SyntaxToken,
427 if let (Some(actual_item), Some(item_with_fake_ident)) = (
428 find_node_at_offset::<ast::Item>(&original_file, offset),
429 find_node_at_offset::<ast::Item>(&speculative_file, offset),
432 self.sema.expand_attr_macro(&actual_item),
433 self.sema.speculative_expand_attr_macro(
435 &item_with_fake_ident,
436 fake_ident_token.clone(),
439 (Some(actual_expansion), Some(speculative_expansion)) => {
440 let new_offset = speculative_expansion.1.text_range().start();
441 if new_offset > actual_expansion.text_range().end() {
444 original_file = actual_expansion;
445 speculative_file = speculative_expansion.0;
446 fake_ident_token = speculative_expansion.1;
455 // Expand fn-like macro calls
456 if let (Some(actual_macro_call), Some(macro_call_with_fake_ident)) = (
457 find_node_at_offset::<ast::MacroCall>(&original_file, offset),
458 find_node_at_offset::<ast::MacroCall>(&speculative_file, offset),
460 let mac_call_path0 = actual_macro_call.path().as_ref().map(|s| s.syntax().text());
462 macro_call_with_fake_ident.path().as_ref().map(|s| s.syntax().text());
463 if mac_call_path0 != mac_call_path1 {
466 let speculative_args = match macro_call_with_fake_ident.token_tree() {
471 if let (Some(actual_expansion), Some(speculative_expansion)) = (
472 self.sema.expand(&actual_macro_call),
473 self.sema.speculative_expand(
479 let new_offset = speculative_expansion.1.text_range().start();
480 if new_offset > actual_expansion.text_range().end() {
483 original_file = actual_expansion;
484 speculative_file = speculative_expansion.0;
485 fake_ident_token = speculative_expansion.1;
495 self.fill(&original_file, speculative_file, offset);
498 fn expected_type_and_name(&self) -> (Option<Type>, Option<NameOrNameRef>) {
499 let mut node = match self.token.parent() {
501 None => return (None, None),
506 ast::LetStmt(it) => {
507 cov_mark::hit!(expected_type_let_with_leading_char);
508 cov_mark::hit!(expected_type_let_without_leading_char);
510 .and_then(|pat| self.sema.type_of_pat(&pat))
511 .or_else(|| it.initializer().and_then(|it| self.sema.type_of_expr(&it)))
512 .map(TypeInfo::original);
513 let name = match it.pat() {
514 Some(ast::Pat::IdentPat(ident)) => ident.name().map(NameOrNameRef::Name),
515 Some(_) | None => None,
521 cov_mark::hit!(expected_type_fn_param);
522 ActiveParameter::at_token(
526 let name = ap.ident().map(NameOrNameRef::Name);
527 let ty = if has_ref(&self.token) {
528 cov_mark::hit!(expected_type_fn_param_ref);
535 .unwrap_or((None, None))
537 ast::RecordExprFieldList(it) => {
538 // wouldn't try {} be nice...
540 if self.token.kind() == T![..]
541 || self.token.prev_token().map(|t| t.kind()) == Some(T![..])
543 cov_mark::hit!(expected_type_struct_func_update);
544 let record_expr = it.syntax().parent().and_then(ast::RecordExpr::cast)?;
545 let ty = self.sema.type_of_expr(&record_expr.into())?;
551 cov_mark::hit!(expected_type_struct_field_without_leading_char);
552 let expr_field = self.token.prev_sibling_or_token()?
554 .and_then(ast::RecordExprField::cast)?;
555 let (_, _, ty) = self.sema.resolve_record_field(&expr_field)?;
558 expr_field.field_name().map(NameOrNameRef::NameRef),
561 })().unwrap_or((None, None))
563 ast::RecordExprField(it) => {
564 if let Some(expr) = it.expr() {
565 cov_mark::hit!(expected_type_struct_field_with_leading_char);
567 self.sema.type_of_expr(&expr).map(TypeInfo::original),
568 it.field_name().map(NameOrNameRef::NameRef),
571 cov_mark::hit!(expected_type_struct_field_followed_by_comma);
572 let ty = self.sema.resolve_record_field(&it)
573 .map(|(_, _, ty)| ty);
576 it.field_name().map(NameOrNameRef::NameRef),
580 ast::MatchExpr(it) => {
581 cov_mark::hit!(expected_type_match_arm_without_leading_char);
582 let ty = it.expr().and_then(|e| self.sema.type_of_expr(&e)).map(TypeInfo::original);
586 cov_mark::hit!(expected_type_if_let_without_leading_char);
587 let ty = it.condition()
588 .and_then(|cond| cond.expr())
589 .and_then(|e| self.sema.type_of_expr(&e))
590 .map(TypeInfo::original);
593 ast::IdentPat(it) => {
594 cov_mark::hit!(expected_type_if_let_with_leading_char);
595 cov_mark::hit!(expected_type_match_arm_with_leading_char);
596 let ty = self.sema.type_of_pat(&ast::Pat::from(it)).map(TypeInfo::original);
600 cov_mark::hit!(expected_type_fn_ret_with_leading_char);
601 cov_mark::hit!(expected_type_fn_ret_without_leading_char);
602 let def = self.sema.to_def(&it);
603 (def.map(|def| def.ret_type(self.db)), None)
605 ast::ClosureExpr(it) => {
606 let ty = self.sema.type_of_expr(&it.into());
607 ty.and_then(|ty| ty.original.as_callable(self.db))
608 .map(|c| (Some(c.return_type()), None))
609 .unwrap_or((None, None))
611 ast::ParamList(_) => (None, None),
612 ast::Stmt(_) => (None, None),
613 ast::Item(_) => (None, None),
615 match node.parent() {
620 None => (None, None),
630 original_file: &SyntaxNode,
631 file_with_fake_ident: SyntaxNode,
634 let fake_ident_token = file_with_fake_ident.token_at_offset(offset).right_biased().unwrap();
635 let syntax_element = NodeOrToken::Token(fake_ident_token);
636 self.previous_token = previous_token(syntax_element.clone());
637 self.attribute_under_caret = syntax_element.ancestors().find_map(ast::Attr::cast);
638 self.no_completion_required = {
639 let inside_impl_trait_block = inside_impl_trait_block(syntax_element.clone());
640 let fn_is_prev = self.previous_token_is(T![fn]);
641 let for_is_prev2 = for_is_prev2(syntax_element.clone());
642 (fn_is_prev && !inside_impl_trait_block) || for_is_prev2
645 self.incomplete_let =
646 syntax_element.ancestors().take(6).find_map(ast::LetStmt::cast).map_or(false, |it| {
647 it.syntax().text_range().end() == syntax_element.text_range().end()
650 let (expected_type, expected_name) = self.expected_type_and_name();
651 self.expected_type = expected_type;
652 self.expected_name = expected_name;
654 let name_like = match find_node_at_offset(&file_with_fake_ident, offset) {
658 self.completion_location =
659 determine_location(&self.sema, original_file, offset, &name_like);
660 self.prev_sibling = determine_prev_sibling(&name_like);
662 find_node_at_offset(original_file, name_like.syntax().text_range().start());
665 .token_ancestors_with_macros(self.token.clone())
666 .take_while(|it| it.kind() != SOURCE_FILE && it.kind() != MODULE)
667 .find_map(ast::Impl::cast);
668 self.function_def = self
670 .token_ancestors_with_macros(self.token.clone())
671 .take_while(|it| it.kind() != SOURCE_FILE && it.kind() != MODULE)
672 .find_map(ast::Fn::cast);
674 ast::NameLike::Lifetime(lifetime) => {
676 Self::classify_lifetime(&self.sema, original_file, lifetime, offset);
678 ast::NameLike::NameRef(name_ref) => {
679 if let Some((path_ctx, pat_ctx)) =
680 Self::classify_name_ref(&self.sema, original_file, name_ref)
682 self.path_context = Some(path_ctx);
683 self.pattern_ctx = pat_ctx;
686 ast::NameLike::Name(name) => {
687 self.pattern_ctx = Self::classify_name(&self.sema, name);
692 fn classify_lifetime(
693 sema: &Semantics<RootDatabase>,
694 original_file: &SyntaxNode,
695 lifetime: ast::Lifetime,
697 ) -> Option<LifetimeContext> {
698 let parent = lifetime.syntax().parent()?;
699 if parent.kind() == ERROR {
705 ast::LifetimeParam(_) => LifetimeContext::LifetimeParam(sema.find_node_at_offset_with_macros(original_file, offset)),
706 ast::BreakExpr(_) => LifetimeContext::LabelRef,
707 ast::ContinueExpr(_) => LifetimeContext::LabelRef,
708 ast::Label(_) => LifetimeContext::LabelDef,
709 _ => LifetimeContext::Lifetime,
714 fn classify_name(_sema: &Semantics<RootDatabase>, name: ast::Name) -> Option<PatternContext> {
715 let bind_pat = name.syntax().parent().and_then(ast::IdentPat::cast)?;
716 let is_name_in_field_pat = bind_pat
719 .and_then(ast::RecordPatField::cast)
720 .map_or(false, |pat_field| pat_field.name_ref().is_none());
721 if is_name_in_field_pat {
724 if !bind_pat.is_simple_ident() {
727 Some(pattern_context_for(bind_pat.into()))
730 fn classify_name_ref(
731 _sema: &Semantics<RootDatabase>,
732 original_file: &SyntaxNode,
733 name_ref: ast::NameRef,
734 ) -> Option<(PathCompletionContext, Option<PatternContext>)> {
735 let parent = name_ref.syntax().parent()?;
736 let segment = ast::PathSegment::cast(parent)?;
737 let path = segment.parent_path();
739 let mut path_ctx = PathCompletionContext {
740 has_call_parens: false,
741 is_trivial_path: false,
744 has_type_args: false,
747 use_tree_parent: false,
750 let mut pat_ctx = None;
751 path_ctx.in_loop_body = is_in_loop_body(name_ref.syntax());
753 path_ctx.kind = path.syntax().ancestors().find_map(|it| {
756 ast::PathType(_) => Some(PathKind::Type),
757 ast::PathExpr(it) => {
758 path_ctx.has_call_parens = it.syntax().parent().map_or(false, |it| ast::CallExpr::can_cast(it.kind()));
761 ast::TupleStructPat(it) => {
762 path_ctx.has_call_parens = true;
763 pat_ctx = Some(pattern_context_for(it.into()));
766 ast::RecordPat(it) => {
767 pat_ctx = Some(pattern_context_for(it.into()));
770 ast::PathPat(it) => {
771 pat_ctx = Some(pattern_context_for(it.into()));
774 ast::MacroCall(it) => it.excl_token().and(Some(PathKind::Mac)),
775 ast::Meta(_) => Some(PathKind::Attr),
776 ast::Visibility(it) => Some(PathKind::Vis { has_in_token: it.in_token().is_some() }),
777 ast::UseTree(_) => Some(PathKind::Use),
782 path_ctx.has_type_args = segment.generic_arg_list().is_some();
784 if let Some((path, use_tree_parent)) = path_or_use_tree_qualifier(&path) {
785 path_ctx.use_tree_parent = use_tree_parent;
786 path_ctx.qualifier = path
789 find_node_with_range::<ast::PathSegment>(
791 it.syntax().text_range(),
794 .map(|it| it.parent_path());
795 return Some((path_ctx, pat_ctx));
798 if let Some(segment) = path.segment() {
799 if segment.coloncolon_token().is_some() {
800 return Some((path_ctx, pat_ctx));
804 path_ctx.is_trivial_path = true;
806 // Find either enclosing expr statement (thing with `;`) or a
807 // block. If block, check that we are the last expr.
808 path_ctx.can_be_stmt = name_ref
812 if let Some(stmt) = ast::ExprStmt::cast(node.clone()) {
813 return Some(stmt.syntax().text_range() == name_ref.syntax().text_range());
815 if let Some(stmt_list) = ast::StmtList::cast(node) {
817 stmt_list.tail_expr().map(|e| e.syntax().text_range())
818 == Some(name_ref.syntax().text_range()),
824 Some((path_ctx, pat_ctx))
828 fn pattern_context_for(pat: ast::Pat) -> PatternContext {
829 let mut is_param = None;
830 let (refutability, has_type_ascription) =
834 .skip_while(|it| ast::Pat::can_cast(it.kind()))
836 .map_or((PatternRefutability::Irrefutable, false), |node| {
837 let refutability = match_ast! {
839 ast::LetStmt(let_) => return (PatternRefutability::Irrefutable, let_.ty().is_some()),
840 ast::Param(param) => {
841 let is_closure_param = param
845 .and_then(ast::ClosureExpr::cast)
847 is_param = Some(if is_closure_param {
852 return (PatternRefutability::Irrefutable, param.ty().is_some())
854 ast::MatchArm(_) => PatternRefutability::Refutable,
855 ast::Condition(_) => PatternRefutability::Refutable,
856 ast::ForExpr(_) => PatternRefutability::Irrefutable,
857 _ => PatternRefutability::Irrefutable,
860 (refutability, false)
862 PatternContext { refutability, is_param, has_type_ascription }
864 fn find_node_with_range<N: AstNode>(syntax: &SyntaxNode, range: TextRange) -> Option<N> {
865 syntax.covering_element(range).ancestors().find_map(N::cast)
868 fn path_or_use_tree_qualifier(path: &ast::Path) -> Option<(ast::Path, bool)> {
869 if let Some(qual) = path.qualifier() {
870 return Some((qual, false));
872 let use_tree_list = path.syntax().ancestors().find_map(ast::UseTreeList::cast)?;
873 let use_tree = use_tree_list.syntax().parent().and_then(ast::UseTree::cast)?;
874 use_tree.path().zip(Some(true))
877 fn has_ref(token: &SyntaxToken) -> bool {
878 let mut token = token.clone();
879 for skip in [WHITESPACE, IDENT, T![mut]] {
880 if token.kind() == skip {
881 token = match token.prev_token() {
883 None => return false,
887 token.kind() == T![&]
892 use expect_test::{expect, Expect};
895 use crate::tests::{position, TEST_CONFIG};
897 use super::CompletionContext;
899 fn check_expected_type_and_name(ra_fixture: &str, expect: Expect) {
900 let (db, pos) = position(ra_fixture);
901 let config = TEST_CONFIG;
902 let completion_context = CompletionContext::new(&db, pos, &config).unwrap();
904 let ty = completion_context
906 .map(|t| t.display_test(&db).to_string())
907 .unwrap_or("?".to_owned());
909 let name = completion_context
911 .map_or_else(|| "?".to_owned(), |name| name.to_string());
913 expect.assert_eq(&format!("ty: {}, name: {}", ty, name));
917 fn expected_type_let_without_leading_char() {
918 cov_mark::check!(expected_type_let_without_leading_char);
919 check_expected_type_and_name(
925 expect![[r#"ty: u32, name: x"#]],
930 fn expected_type_let_with_leading_char() {
931 cov_mark::check!(expected_type_let_with_leading_char);
932 check_expected_type_and_name(
938 expect![[r#"ty: u32, name: x"#]],
943 fn expected_type_let_pat() {
944 check_expected_type_and_name(
950 expect![[r#"ty: u32, name: ?"#]],
952 check_expected_type_and_name(
958 expect![[r#"ty: u32, name: ?"#]],
963 fn expected_type_fn_param() {
964 cov_mark::check!(expected_type_fn_param);
965 check_expected_type_and_name(
967 fn foo() { bar($0); }
970 expect![[r#"ty: u32, name: x"#]],
972 check_expected_type_and_name(
974 fn foo() { bar(c$0); }
977 expect![[r#"ty: u32, name: x"#]],
982 fn expected_type_fn_param_ref() {
983 cov_mark::check!(expected_type_fn_param_ref);
984 check_expected_type_and_name(
986 fn foo() { bar(&$0); }
989 expect![[r#"ty: u32, name: x"#]],
991 check_expected_type_and_name(
993 fn foo() { bar(&mut $0); }
994 fn bar(x: &mut u32) {}
996 expect![[r#"ty: u32, name: x"#]],
998 check_expected_type_and_name(
1000 fn foo() { bar(&c$0); }
1003 expect![[r#"ty: u32, name: x"#]],
1008 fn expected_type_struct_field_without_leading_char() {
1009 cov_mark::check!(expected_type_struct_field_without_leading_char);
1010 check_expected_type_and_name(
1012 struct Foo { a: u32 }
1017 expect![[r#"ty: u32, name: a"#]],
1022 fn expected_type_struct_field_followed_by_comma() {
1023 cov_mark::check!(expected_type_struct_field_followed_by_comma);
1024 check_expected_type_and_name(
1026 struct Foo { a: u32 }
1031 expect![[r#"ty: u32, name: a"#]],
1036 fn expected_type_generic_struct_field() {
1037 check_expected_type_and_name(
1039 struct Foo<T> { a: T }
1040 fn foo() -> Foo<u32> {
1044 expect![[r#"ty: u32, name: a"#]],
1049 fn expected_type_struct_field_with_leading_char() {
1050 cov_mark::check!(expected_type_struct_field_with_leading_char);
1051 check_expected_type_and_name(
1053 struct Foo { a: u32 }
1058 expect![[r#"ty: u32, name: a"#]],
1063 fn expected_type_match_arm_without_leading_char() {
1064 cov_mark::check!(expected_type_match_arm_without_leading_char);
1065 check_expected_type_and_name(
1072 expect![[r#"ty: E, name: ?"#]],
1077 fn expected_type_match_arm_with_leading_char() {
1078 cov_mark::check!(expected_type_match_arm_with_leading_char);
1079 check_expected_type_and_name(
1086 expect![[r#"ty: E, name: ?"#]],
1091 fn expected_type_if_let_without_leading_char() {
1092 cov_mark::check!(expected_type_if_let_without_leading_char);
1093 check_expected_type_and_name(
1095 enum Foo { Bar, Baz, Quux }
1102 expect![[r#"ty: Foo, name: ?"#]],
1107 fn expected_type_if_let_with_leading_char() {
1108 cov_mark::check!(expected_type_if_let_with_leading_char);
1109 check_expected_type_and_name(
1111 enum Foo { Bar, Baz, Quux }
1118 expect![[r#"ty: Foo, name: ?"#]],
1123 fn expected_type_fn_ret_without_leading_char() {
1124 cov_mark::check!(expected_type_fn_ret_without_leading_char);
1125 check_expected_type_and_name(
1131 expect![[r#"ty: u32, name: ?"#]],
1136 fn expected_type_fn_ret_with_leading_char() {
1137 cov_mark::check!(expected_type_fn_ret_with_leading_char);
1138 check_expected_type_and_name(
1144 expect![[r#"ty: u32, name: ?"#]],
1149 fn expected_type_fn_ret_fn_ref_fully_typed() {
1150 check_expected_type_and_name(
1156 expect![[r#"ty: u32, name: ?"#]],
1161 fn expected_type_closure_param_return() {
1162 // FIXME: make this work with `|| $0`
1163 check_expected_type_and_name(
1170 fn bar(f: impl FnOnce() -> u32) {}
1172 expect![[r#"ty: u32, name: ?"#]],
1177 fn expected_type_generic_function() {
1178 check_expected_type_and_name(
1186 expect![[r#"ty: u32, name: t"#]],
1191 fn expected_type_generic_method() {
1192 check_expected_type_and_name(
1200 fn bar(self, t: T) {}
1203 expect![[r#"ty: u32, name: t"#]],
1208 fn expected_type_functional_update() {
1209 cov_mark::check!(expected_type_struct_func_update);
1210 check_expected_type_and_name(
1212 struct Foo { field: u32 }
1219 expect![[r#"ty: Foo, name: ?"#]],
1224 fn expected_type_param_pat() {
1225 check_expected_type_and_name(
1227 struct Foo { field: u32 }
1230 expect![[r#"ty: Foo, name: ?"#]],
1232 check_expected_type_and_name(
1234 struct Foo { field: u32 }
1237 // FIXME make this work, currently fails due to pattern recovery eating the `:`
1238 expect![[r#"ty: ?, name: ?"#]],