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[rust.git] / crates / rust-analyzer / src / to_proto.rs
1 //! Conversion of rust-analyzer specific types to lsp_types equivalents.
2 use ra_db::{FileId, FileRange};
3 use ra_ide::{
4     Assist, CompletionItem, CompletionItemKind, Documentation, FileSystemEdit, Fold, FoldKind,
5     FunctionSignature, Highlight, HighlightModifier, HighlightTag, HighlightedRange, Indel,
6     InlayHint, InlayKind, InsertTextFormat, LineIndex, NavigationTarget, ReferenceAccess, Severity,
7     SourceChange, SourceFileEdit, TextEdit,
8 };
9 use ra_syntax::{SyntaxKind, TextRange, TextSize};
10 use ra_vfs::LineEndings;
11
12 use crate::{lsp_ext, semantic_tokens, world::WorldSnapshot, Result};
13
14 pub(crate) fn position(line_index: &LineIndex, offset: TextSize) -> lsp_types::Position {
15     let line_col = line_index.line_col(offset);
16     let line = u64::from(line_col.line);
17     let character = u64::from(line_col.col_utf16);
18     lsp_types::Position::new(line, character)
19 }
20
21 pub(crate) fn range(line_index: &LineIndex, range: TextRange) -> lsp_types::Range {
22     let start = position(line_index, range.start());
23     let end = position(line_index, range.end());
24     lsp_types::Range::new(start, end)
25 }
26
27 pub(crate) fn symbol_kind(syntax_kind: SyntaxKind) -> lsp_types::SymbolKind {
28     match syntax_kind {
29         SyntaxKind::FN_DEF => lsp_types::SymbolKind::Function,
30         SyntaxKind::STRUCT_DEF => lsp_types::SymbolKind::Struct,
31         SyntaxKind::ENUM_DEF => lsp_types::SymbolKind::Enum,
32         SyntaxKind::ENUM_VARIANT => lsp_types::SymbolKind::EnumMember,
33         SyntaxKind::TRAIT_DEF => lsp_types::SymbolKind::Interface,
34         SyntaxKind::MACRO_CALL => lsp_types::SymbolKind::Function,
35         SyntaxKind::MODULE => lsp_types::SymbolKind::Module,
36         SyntaxKind::TYPE_ALIAS_DEF => lsp_types::SymbolKind::TypeParameter,
37         SyntaxKind::RECORD_FIELD_DEF => lsp_types::SymbolKind::Field,
38         SyntaxKind::STATIC_DEF => lsp_types::SymbolKind::Constant,
39         SyntaxKind::CONST_DEF => lsp_types::SymbolKind::Constant,
40         SyntaxKind::IMPL_DEF => lsp_types::SymbolKind::Object,
41         _ => lsp_types::SymbolKind::Variable,
42     }
43 }
44
45 pub(crate) fn document_highlight_kind(
46     reference_access: ReferenceAccess,
47 ) -> lsp_types::DocumentHighlightKind {
48     match reference_access {
49         ReferenceAccess::Read => lsp_types::DocumentHighlightKind::Read,
50         ReferenceAccess::Write => lsp_types::DocumentHighlightKind::Write,
51     }
52 }
53
54 pub(crate) fn diagnostic_severity(severity: Severity) -> lsp_types::DiagnosticSeverity {
55     match severity {
56         Severity::Error => lsp_types::DiagnosticSeverity::Error,
57         Severity::WeakWarning => lsp_types::DiagnosticSeverity::Hint,
58     }
59 }
60
61 pub(crate) fn documentation(documentation: Documentation) -> lsp_types::Documentation {
62     let value = crate::markdown::format_docs(documentation.as_str());
63     let markup_content = lsp_types::MarkupContent { kind: lsp_types::MarkupKind::Markdown, value };
64     lsp_types::Documentation::MarkupContent(markup_content)
65 }
66
67 pub(crate) fn insert_text_format(
68     insert_text_format: InsertTextFormat,
69 ) -> lsp_types::InsertTextFormat {
70     match insert_text_format {
71         InsertTextFormat::Snippet => lsp_types::InsertTextFormat::Snippet,
72         InsertTextFormat::PlainText => lsp_types::InsertTextFormat::PlainText,
73     }
74 }
75
76 pub(crate) fn completion_item_kind(
77     completion_item_kind: CompletionItemKind,
78 ) -> lsp_types::CompletionItemKind {
79     match completion_item_kind {
80         CompletionItemKind::Keyword => lsp_types::CompletionItemKind::Keyword,
81         CompletionItemKind::Snippet => lsp_types::CompletionItemKind::Snippet,
82         CompletionItemKind::Module => lsp_types::CompletionItemKind::Module,
83         CompletionItemKind::Function => lsp_types::CompletionItemKind::Function,
84         CompletionItemKind::Struct => lsp_types::CompletionItemKind::Struct,
85         CompletionItemKind::Enum => lsp_types::CompletionItemKind::Enum,
86         CompletionItemKind::EnumVariant => lsp_types::CompletionItemKind::EnumMember,
87         CompletionItemKind::BuiltinType => lsp_types::CompletionItemKind::Struct,
88         CompletionItemKind::Binding => lsp_types::CompletionItemKind::Variable,
89         CompletionItemKind::Field => lsp_types::CompletionItemKind::Field,
90         CompletionItemKind::Trait => lsp_types::CompletionItemKind::Interface,
91         CompletionItemKind::TypeAlias => lsp_types::CompletionItemKind::Struct,
92         CompletionItemKind::Const => lsp_types::CompletionItemKind::Constant,
93         CompletionItemKind::Static => lsp_types::CompletionItemKind::Value,
94         CompletionItemKind::Method => lsp_types::CompletionItemKind::Method,
95         CompletionItemKind::TypeParam => lsp_types::CompletionItemKind::TypeParameter,
96         CompletionItemKind::Macro => lsp_types::CompletionItemKind::Method,
97         CompletionItemKind::Attribute => lsp_types::CompletionItemKind::EnumMember,
98     }
99 }
100
101 pub(crate) fn text_edit(
102     line_index: &LineIndex,
103     line_endings: LineEndings,
104     indel: Indel,
105 ) -> lsp_types::TextEdit {
106     let range = range(line_index, indel.delete);
107     let new_text = match line_endings {
108         LineEndings::Unix => indel.insert,
109         LineEndings::Dos => indel.insert.replace('\n', "\r\n"),
110     };
111     lsp_types::TextEdit { range, new_text }
112 }
113
114 pub(crate) fn snippet_text_edit(
115     line_index: &LineIndex,
116     line_endings: LineEndings,
117     is_snippet: bool,
118     indel: Indel,
119 ) -> lsp_ext::SnippetTextEdit {
120     let text_edit = text_edit(line_index, line_endings, indel);
121     let insert_text_format =
122         if is_snippet { Some(lsp_types::InsertTextFormat::Snippet) } else { None };
123     lsp_ext::SnippetTextEdit {
124         range: text_edit.range,
125         new_text: text_edit.new_text,
126         insert_text_format,
127     }
128 }
129
130 pub(crate) fn text_edit_vec(
131     line_index: &LineIndex,
132     line_endings: LineEndings,
133     text_edit: TextEdit,
134 ) -> Vec<lsp_types::TextEdit> {
135     text_edit.into_iter().map(|indel| self::text_edit(line_index, line_endings, indel)).collect()
136 }
137
138 pub(crate) fn snippet_text_edit_vec(
139     line_index: &LineIndex,
140     line_endings: LineEndings,
141     is_snippet: bool,
142     text_edit: TextEdit,
143 ) -> Vec<lsp_ext::SnippetTextEdit> {
144     text_edit
145         .into_iter()
146         .map(|indel| self::snippet_text_edit(line_index, line_endings, is_snippet, indel))
147         .collect()
148 }
149
150 pub(crate) fn completion_item(
151     line_index: &LineIndex,
152     line_endings: LineEndings,
153     completion_item: CompletionItem,
154 ) -> lsp_types::CompletionItem {
155     let mut additional_text_edits = Vec::new();
156     let mut text_edit = None;
157     // LSP does not allow arbitrary edits in completion, so we have to do a
158     // non-trivial mapping here.
159     let source_range = completion_item.source_range();
160     for indel in completion_item.text_edit().iter() {
161         if indel.delete.contains_range(source_range) {
162             text_edit = Some(if indel.delete == source_range {
163                 self::text_edit(line_index, line_endings, indel.clone())
164             } else {
165                 assert!(source_range.end() == indel.delete.end());
166                 let range1 = TextRange::new(indel.delete.start(), source_range.start());
167                 let range2 = source_range;
168                 let indel1 = Indel::replace(range1, String::new());
169                 let indel2 = Indel::replace(range2, indel.insert.clone());
170                 additional_text_edits.push(self::text_edit(line_index, line_endings, indel1));
171                 self::text_edit(line_index, line_endings, indel2)
172             })
173         } else {
174             assert!(source_range.intersect(indel.delete).is_none());
175             let text_edit = self::text_edit(line_index, line_endings, indel.clone());
176             additional_text_edits.push(text_edit);
177         }
178     }
179     let text_edit = text_edit.unwrap();
180
181     let mut res = lsp_types::CompletionItem {
182         label: completion_item.label().to_string(),
183         detail: completion_item.detail().map(|it| it.to_string()),
184         filter_text: Some(completion_item.lookup().to_string()),
185         kind: completion_item.kind().map(completion_item_kind),
186         text_edit: Some(text_edit.into()),
187         additional_text_edits: Some(additional_text_edits),
188         documentation: completion_item.documentation().map(documentation),
189         deprecated: Some(completion_item.deprecated()),
190         ..Default::default()
191     };
192
193     if completion_item.score().is_some() {
194         res.preselect = Some(true);
195         // HACK: sort preselect items first
196         res.sort_text = Some(format!(" {}", completion_item.label()));
197     }
198
199     if completion_item.deprecated() {
200         res.tags = Some(vec![lsp_types::CompletionItemTag::Deprecated])
201     }
202
203     if completion_item.trigger_call_info() {
204         res.command = Some(lsp_types::Command {
205             title: "triggerParameterHints".into(),
206             command: "editor.action.triggerParameterHints".into(),
207             arguments: None,
208         });
209     }
210
211     res.insert_text_format = Some(insert_text_format(completion_item.insert_text_format()));
212
213     res
214 }
215
216 pub(crate) fn signature_information(
217     signature: FunctionSignature,
218     concise: bool,
219 ) -> lsp_types::SignatureInformation {
220     let (label, documentation, params) = if concise {
221         let mut params = signature.parameters;
222         if signature.has_self_param {
223             params.remove(0);
224         }
225         (params.join(", "), None, params)
226     } else {
227         (signature.to_string(), signature.doc.map(documentation), signature.parameters)
228     };
229
230     let parameters: Vec<lsp_types::ParameterInformation> = params
231         .into_iter()
232         .map(|param| lsp_types::ParameterInformation {
233             label: lsp_types::ParameterLabel::Simple(param),
234             documentation: None,
235         })
236         .collect();
237
238     lsp_types::SignatureInformation { label, documentation, parameters: Some(parameters) }
239 }
240
241 pub(crate) fn inlay_int(line_index: &LineIndex, inlay_hint: InlayHint) -> lsp_ext::InlayHint {
242     lsp_ext::InlayHint {
243         label: inlay_hint.label.to_string(),
244         range: range(line_index, inlay_hint.range),
245         kind: match inlay_hint.kind {
246             InlayKind::ParameterHint => lsp_ext::InlayKind::ParameterHint,
247             InlayKind::TypeHint => lsp_ext::InlayKind::TypeHint,
248             InlayKind::ChainingHint => lsp_ext::InlayKind::ChainingHint,
249         },
250     }
251 }
252
253 pub(crate) fn semantic_tokens(
254     text: &str,
255     line_index: &LineIndex,
256     highlights: Vec<HighlightedRange>,
257 ) -> lsp_types::SemanticTokens {
258     let mut builder = semantic_tokens::SemanticTokensBuilder::default();
259
260     for highlight_range in highlights {
261         let (type_, mods) = semantic_token_type_and_modifiers(highlight_range.highlight);
262         let token_index = semantic_tokens::type_index(type_);
263         let modifier_bitset = mods.0;
264
265         for mut text_range in line_index.lines(highlight_range.range) {
266             if text[text_range].ends_with('\n') {
267                 text_range =
268                     TextRange::new(text_range.start(), text_range.end() - TextSize::of('\n'));
269             }
270             let range = range(&line_index, text_range);
271             builder.push(range, token_index, modifier_bitset);
272         }
273     }
274
275     builder.build()
276 }
277
278 fn semantic_token_type_and_modifiers(
279     highlight: Highlight,
280 ) -> (lsp_types::SemanticTokenType, semantic_tokens::ModifierSet) {
281     let mut mods = semantic_tokens::ModifierSet::default();
282     let type_ = match highlight.tag {
283         HighlightTag::Struct => lsp_types::SemanticTokenType::STRUCT,
284         HighlightTag::Enum => lsp_types::SemanticTokenType::ENUM,
285         HighlightTag::Union => semantic_tokens::UNION,
286         HighlightTag::TypeAlias => semantic_tokens::TYPE_ALIAS,
287         HighlightTag::Trait => lsp_types::SemanticTokenType::INTERFACE,
288         HighlightTag::BuiltinType => semantic_tokens::BUILTIN_TYPE,
289         HighlightTag::SelfKeyword => semantic_tokens::SELF_KEYWORD,
290         HighlightTag::SelfType => lsp_types::SemanticTokenType::TYPE,
291         HighlightTag::Field => lsp_types::SemanticTokenType::PROPERTY,
292         HighlightTag::Function => lsp_types::SemanticTokenType::FUNCTION,
293         HighlightTag::Module => lsp_types::SemanticTokenType::NAMESPACE,
294         HighlightTag::Constant => {
295             mods |= semantic_tokens::CONSTANT;
296             mods |= lsp_types::SemanticTokenModifier::STATIC;
297             lsp_types::SemanticTokenType::VARIABLE
298         }
299         HighlightTag::Static => {
300             mods |= lsp_types::SemanticTokenModifier::STATIC;
301             lsp_types::SemanticTokenType::VARIABLE
302         }
303         HighlightTag::EnumVariant => semantic_tokens::ENUM_MEMBER,
304         HighlightTag::Macro => lsp_types::SemanticTokenType::MACRO,
305         HighlightTag::Local => lsp_types::SemanticTokenType::VARIABLE,
306         HighlightTag::TypeParam => lsp_types::SemanticTokenType::TYPE_PARAMETER,
307         HighlightTag::Lifetime => semantic_tokens::LIFETIME,
308         HighlightTag::ByteLiteral | HighlightTag::NumericLiteral => {
309             lsp_types::SemanticTokenType::NUMBER
310         }
311         HighlightTag::BoolLiteral => semantic_tokens::BOOLEAN,
312         HighlightTag::CharLiteral | HighlightTag::StringLiteral => {
313             lsp_types::SemanticTokenType::STRING
314         }
315         HighlightTag::Comment => lsp_types::SemanticTokenType::COMMENT,
316         HighlightTag::Attribute => semantic_tokens::ATTRIBUTE,
317         HighlightTag::Keyword => lsp_types::SemanticTokenType::KEYWORD,
318         HighlightTag::UnresolvedReference => semantic_tokens::UNRESOLVED_REFERENCE,
319         HighlightTag::FormatSpecifier => semantic_tokens::FORMAT_SPECIFIER,
320     };
321
322     for modifier in highlight.modifiers.iter() {
323         let modifier = match modifier {
324             HighlightModifier::Attribute => semantic_tokens::ATTRIBUTE_MODIFIER,
325             HighlightModifier::Definition => lsp_types::SemanticTokenModifier::DECLARATION,
326             HighlightModifier::ControlFlow => semantic_tokens::CONTROL_FLOW,
327             HighlightModifier::Mutable => semantic_tokens::MUTABLE,
328             HighlightModifier::Unsafe => semantic_tokens::UNSAFE,
329         };
330         mods |= modifier;
331     }
332
333     (type_, mods)
334 }
335
336 pub(crate) fn folding_range(
337     text: &str,
338     line_index: &LineIndex,
339     line_folding_only: bool,
340     fold: Fold,
341 ) -> lsp_types::FoldingRange {
342     let kind = match fold.kind {
343         FoldKind::Comment => Some(lsp_types::FoldingRangeKind::Comment),
344         FoldKind::Imports => Some(lsp_types::FoldingRangeKind::Imports),
345         FoldKind::Mods | FoldKind::Block => None,
346     };
347
348     let range = range(line_index, fold.range);
349
350     if line_folding_only {
351         // Clients with line_folding_only == true (such as VSCode) will fold the whole end line
352         // even if it contains text not in the folding range. To prevent that we exclude
353         // range.end.line from the folding region if there is more text after range.end
354         // on the same line.
355         let has_more_text_on_end_line = text[TextRange::new(fold.range.end(), TextSize::of(text))]
356             .chars()
357             .take_while(|it| *it != '\n')
358             .any(|it| !it.is_whitespace());
359
360         let end_line = if has_more_text_on_end_line {
361             range.end.line.saturating_sub(1)
362         } else {
363             range.end.line
364         };
365
366         lsp_types::FoldingRange {
367             start_line: range.start.line,
368             start_character: None,
369             end_line,
370             end_character: None,
371             kind,
372         }
373     } else {
374         lsp_types::FoldingRange {
375             start_line: range.start.line,
376             start_character: Some(range.start.character),
377             end_line: range.end.line,
378             end_character: Some(range.end.character),
379             kind,
380         }
381     }
382 }
383
384 pub(crate) fn url(world: &WorldSnapshot, file_id: FileId) -> Result<lsp_types::Url> {
385     world.file_id_to_uri(file_id)
386 }
387
388 pub(crate) fn versioned_text_document_identifier(
389     world: &WorldSnapshot,
390     file_id: FileId,
391     version: Option<i64>,
392 ) -> Result<lsp_types::VersionedTextDocumentIdentifier> {
393     let res = lsp_types::VersionedTextDocumentIdentifier { uri: url(world, file_id)?, version };
394     Ok(res)
395 }
396
397 pub(crate) fn location(world: &WorldSnapshot, frange: FileRange) -> Result<lsp_types::Location> {
398     let url = url(world, frange.file_id)?;
399     let line_index = world.analysis().file_line_index(frange.file_id)?;
400     let range = range(&line_index, frange.range);
401     let loc = lsp_types::Location::new(url, range);
402     Ok(loc)
403 }
404
405 pub(crate) fn location_link(
406     world: &WorldSnapshot,
407     src: Option<FileRange>,
408     target: NavigationTarget,
409 ) -> Result<lsp_types::LocationLink> {
410     let origin_selection_range = match src {
411         Some(src) => {
412             let line_index = world.analysis().file_line_index(src.file_id)?;
413             let range = range(&line_index, src.range);
414             Some(range)
415         }
416         None => None,
417     };
418     let (target_uri, target_range, target_selection_range) = location_info(world, target)?;
419     let res = lsp_types::LocationLink {
420         origin_selection_range,
421         target_uri,
422         target_range,
423         target_selection_range,
424     };
425     Ok(res)
426 }
427
428 fn location_info(
429     world: &WorldSnapshot,
430     target: NavigationTarget,
431 ) -> Result<(lsp_types::Url, lsp_types::Range, lsp_types::Range)> {
432     let line_index = world.analysis().file_line_index(target.file_id())?;
433
434     let target_uri = url(world, target.file_id())?;
435     let target_range = range(&line_index, target.full_range());
436     let target_selection_range =
437         target.focus_range().map(|it| range(&line_index, it)).unwrap_or(target_range);
438     Ok((target_uri, target_range, target_selection_range))
439 }
440
441 pub(crate) fn goto_definition_response(
442     world: &WorldSnapshot,
443     src: Option<FileRange>,
444     targets: Vec<NavigationTarget>,
445 ) -> Result<lsp_types::GotoDefinitionResponse> {
446     if world.config.client_caps.location_link {
447         let links = targets
448             .into_iter()
449             .map(|nav| location_link(world, src, nav))
450             .collect::<Result<Vec<_>>>()?;
451         Ok(links.into())
452     } else {
453         let locations = targets
454             .into_iter()
455             .map(|nav| {
456                 location(
457                     world,
458                     FileRange {
459                         file_id: nav.file_id(),
460                         range: nav.focus_range().unwrap_or(nav.range()),
461                     },
462                 )
463             })
464             .collect::<Result<Vec<_>>>()?;
465         Ok(locations.into())
466     }
467 }
468
469 pub(crate) fn snippet_text_document_edit(
470     world: &WorldSnapshot,
471     is_snippet: bool,
472     source_file_edit: SourceFileEdit,
473 ) -> Result<lsp_ext::SnippetTextDocumentEdit> {
474     let text_document = versioned_text_document_identifier(world, source_file_edit.file_id, None)?;
475     let line_index = world.analysis().file_line_index(source_file_edit.file_id)?;
476     let line_endings = world.file_line_endings(source_file_edit.file_id);
477     let edits = source_file_edit
478         .edit
479         .into_iter()
480         .map(|it| snippet_text_edit(&line_index, line_endings, is_snippet, it))
481         .collect();
482     Ok(lsp_ext::SnippetTextDocumentEdit { text_document, edits })
483 }
484
485 pub(crate) fn resource_op(
486     world: &WorldSnapshot,
487     file_system_edit: FileSystemEdit,
488 ) -> Result<lsp_types::ResourceOp> {
489     let res = match file_system_edit {
490         FileSystemEdit::CreateFile { source_root, path } => {
491             let uri = world.path_to_uri(source_root, &path)?;
492             lsp_types::ResourceOp::Create(lsp_types::CreateFile { uri, options: None })
493         }
494         FileSystemEdit::MoveFile { src, dst_source_root, dst_path } => {
495             let old_uri = world.file_id_to_uri(src)?;
496             let new_uri = world.path_to_uri(dst_source_root, &dst_path)?;
497             lsp_types::ResourceOp::Rename(lsp_types::RenameFile { old_uri, new_uri, options: None })
498         }
499     };
500     Ok(res)
501 }
502
503 pub(crate) fn snippet_workspace_edit(
504     world: &WorldSnapshot,
505     source_change: SourceChange,
506 ) -> Result<lsp_ext::SnippetWorkspaceEdit> {
507     let mut document_changes: Vec<lsp_ext::SnippetDocumentChangeOperation> = Vec::new();
508     for op in source_change.file_system_edits {
509         let op = resource_op(&world, op)?;
510         document_changes.push(lsp_ext::SnippetDocumentChangeOperation::Op(op));
511     }
512     for edit in source_change.source_file_edits {
513         let edit = snippet_text_document_edit(&world, source_change.is_snippet, edit)?;
514         document_changes.push(lsp_ext::SnippetDocumentChangeOperation::Edit(edit));
515     }
516     let workspace_edit =
517         lsp_ext::SnippetWorkspaceEdit { changes: None, document_changes: Some(document_changes) };
518     Ok(workspace_edit)
519 }
520
521 pub(crate) fn workspace_edit(
522     world: &WorldSnapshot,
523     source_change: SourceChange,
524 ) -> Result<lsp_types::WorkspaceEdit> {
525     assert!(!source_change.is_snippet);
526     snippet_workspace_edit(world, source_change).map(|it| it.into())
527 }
528
529 impl From<lsp_ext::SnippetWorkspaceEdit> for lsp_types::WorkspaceEdit {
530     fn from(snippet_workspace_edit: lsp_ext::SnippetWorkspaceEdit) -> lsp_types::WorkspaceEdit {
531         lsp_types::WorkspaceEdit {
532             changes: None,
533             document_changes: snippet_workspace_edit.document_changes.map(|changes| {
534                 lsp_types::DocumentChanges::Operations(
535                     changes
536                         .into_iter()
537                         .map(|change| match change {
538                             lsp_ext::SnippetDocumentChangeOperation::Op(op) => {
539                                 lsp_types::DocumentChangeOperation::Op(op)
540                             }
541                             lsp_ext::SnippetDocumentChangeOperation::Edit(edit) => {
542                                 lsp_types::DocumentChangeOperation::Edit(
543                                     lsp_types::TextDocumentEdit {
544                                         text_document: edit.text_document,
545                                         edits: edit
546                                             .edits
547                                             .into_iter()
548                                             .map(|edit| lsp_types::TextEdit {
549                                                 range: edit.range,
550                                                 new_text: edit.new_text,
551                                             })
552                                             .collect(),
553                                     },
554                                 )
555                             }
556                         })
557                         .collect(),
558                 )
559             }),
560         }
561     }
562 }
563
564 pub fn call_hierarchy_item(
565     world: &WorldSnapshot,
566     target: NavigationTarget,
567 ) -> Result<lsp_types::CallHierarchyItem> {
568     let name = target.name().to_string();
569     let detail = target.description().map(|it| it.to_string());
570     let kind = symbol_kind(target.kind());
571     let (uri, range, selection_range) = location_info(world, target)?;
572     Ok(lsp_types::CallHierarchyItem { name, kind, tags: None, detail, uri, range, selection_range })
573 }
574
575 #[cfg(test)]
576 mod tests {
577     use test_utils::extract_ranges;
578
579     use super::*;
580
581     #[test]
582     fn conv_fold_line_folding_only_fixup() {
583         let text = r#"<fold>mod a;
584 mod b;
585 mod c;</fold>
586
587 fn main() <fold>{
588     if cond <fold>{
589         a::do_a();
590     }</fold> else <fold>{
591         b::do_b();
592     }</fold>
593 }</fold>"#;
594
595         let (ranges, text) = extract_ranges(text, "fold");
596         assert_eq!(ranges.len(), 4);
597         let folds = vec![
598             Fold { range: ranges[0], kind: FoldKind::Mods },
599             Fold { range: ranges[1], kind: FoldKind::Block },
600             Fold { range: ranges[2], kind: FoldKind::Block },
601             Fold { range: ranges[3], kind: FoldKind::Block },
602         ];
603
604         let line_index = LineIndex::new(&text);
605         let converted: Vec<lsp_types::FoldingRange> =
606             folds.into_iter().map(|it| folding_range(&text, &line_index, true, it)).collect();
607
608         let expected_lines = [(0, 2), (4, 10), (5, 6), (7, 9)];
609         assert_eq!(converted.len(), expected_lines.len());
610         for (folding_range, (start_line, end_line)) in converted.iter().zip(expected_lines.iter()) {
611             assert_eq!(folding_range.start_line, *start_line);
612             assert_eq!(folding_range.start_character, None);
613             assert_eq!(folding_range.end_line, *end_line);
614             assert_eq!(folding_range.end_character, None);
615         }
616     }
617 }
618
619 pub(crate) fn code_action(world: &WorldSnapshot, assist: Assist) -> Result<lsp_ext::CodeAction> {
620     let res = lsp_ext::CodeAction {
621         title: assist.label,
622         group: if world.config.client_caps.code_action_group { assist.group_label } else { None },
623         kind: Some(String::new()),
624         edit: Some(snippet_workspace_edit(world, assist.source_change)?),
625         command: None,
626     };
627     Ok(res)
628 }