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diff --git a/crates/ra_ide/src/syntax_highlighting.rs b/crates/ra_ide/src/syntax_highlighting.rs
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1mod tags;
2mod html;
3mod injection;
4#[cfg(test)]
5mod tests;
6
7use hir::{Name, Semantics};
8use ra_ide_db::{
9 defs::{classify_name, classify_name_ref, Definition, NameClass, NameRefClass},
10 RootDatabase,
11};
12use ra_prof::profile;
13use ra_syntax::{
14 ast::{self, HasFormatSpecifier},
15 AstNode, AstToken, Direction, NodeOrToken, SyntaxElement,
16 SyntaxKind::*,
17 TextRange, WalkEvent, T,
18};
19use rustc_hash::FxHashMap;
20
21use crate::FileId;
22
23use ast::FormatSpecifier;
24pub(crate) use html::highlight_as_html;
25pub use tags::{Highlight, HighlightModifier, HighlightModifiers, HighlightTag};
26
27#[derive(Debug, Clone)]
28pub struct HighlightedRange {
29 pub range: TextRange,
30 pub highlight: Highlight,
31 pub binding_hash: Option<u64>,
32}
33
34// Feature: Semantic Syntax Highlighting
35//
36// rust-analyzer highlights the code semantically.
37// For example, `bar` in `foo::Bar` might be colored differently depending on whether `Bar` is an enum or a trait.
38// rust-analyzer does not specify colors directly, instead it assigns tag (like `struct`) and a set of modifiers (like `declaration`) to each token.
39// It's up to the client to map those to specific colors.
40//
41// The general rule is that a reference to an entity gets colored the same way as the entity itself.
42// We also give special modifier for `mut` and `&mut` local variables.
43pub(crate) fn highlight(
44 db: &RootDatabase,
45 file_id: FileId,
46 range_to_highlight: Option<TextRange>,
47 syntactic_name_ref_highlighting: bool,
48) -> Vec<HighlightedRange> {
49 let _p = profile("highlight");
50 let sema = Semantics::new(db);
51
52 // Determine the root based on the given range.
53 let (root, range_to_highlight) = {
54 let source_file = sema.parse(file_id);
55 match range_to_highlight {
56 Some(range) => {
57 let node = match source_file.syntax().covering_element(range) {
58 NodeOrToken::Node(it) => it,
59 NodeOrToken::Token(it) => it.parent(),
60 };
61 (node, range)
62 }
63 None => (source_file.syntax().clone(), source_file.syntax().text_range()),
64 }
65 };
66
67 let mut bindings_shadow_count: FxHashMap<Name, u32> = FxHashMap::default();
68 // We use a stack for the DFS traversal below.
69 // When we leave a node, the we use it to flatten the highlighted ranges.
70 let mut stack = HighlightedRangeStack::new();
71
72 let mut current_macro_call: Option<ast::MacroCall> = None;
73 let mut format_string: Option<SyntaxElement> = None;
74
75 // Walk all nodes, keeping track of whether we are inside a macro or not.
76 // If in macro, expand it first and highlight the expanded code.
77 for event in root.preorder_with_tokens() {
78 match &event {
79 WalkEvent::Enter(_) => stack.push(),
80 WalkEvent::Leave(_) => stack.pop(),
81 };
82
83 let event_range = match &event {
84 WalkEvent::Enter(it) => it.text_range(),
85 WalkEvent::Leave(it) => it.text_range(),
86 };
87
88 // Element outside of the viewport, no need to highlight
89 if range_to_highlight.intersect(event_range).is_none() {
90 continue;
91 }
92
93 // Track "inside macro" state
94 match event.clone().map(|it| it.into_node().and_then(ast::MacroCall::cast)) {
95 WalkEvent::Enter(Some(mc)) => {
96 current_macro_call = Some(mc.clone());
97 if let Some(range) = macro_call_range(&mc) {
98 stack.add(HighlightedRange {
99 range,
100 highlight: HighlightTag::Macro.into(),
101 binding_hash: None,
102 });
103 }
104 if let Some(name) = mc.is_macro_rules() {
105 if let Some((highlight, binding_hash)) = highlight_element(
106 &sema,
107 &mut bindings_shadow_count,
108 syntactic_name_ref_highlighting,
109 name.syntax().clone().into(),
110 ) {
111 stack.add(HighlightedRange {
112 range: name.syntax().text_range(),
113 highlight,
114 binding_hash,
115 });
116 }
117 }
118 continue;
119 }
120 WalkEvent::Leave(Some(mc)) => {
121 assert!(current_macro_call == Some(mc));
122 current_macro_call = None;
123 format_string = None;
124 }
125 _ => (),
126 }
127
128 // Check for Rust code in documentation
129 match &event {
130 WalkEvent::Leave(NodeOrToken::Node(node)) => {
131 if let Some((doctest, range_mapping, new_comments)) =
132 injection::extract_doc_comments(node)
133 {
134 injection::highlight_doc_comment(
135 doctest,
136 range_mapping,
137 new_comments,
138 &mut stack,
139 );
140 }
141 }
142 _ => (),
143 }
144
145 let element = match event {
146 WalkEvent::Enter(it) => it,
147 WalkEvent::Leave(_) => continue,
148 };
149
150 let range = element.text_range();
151
152 let element_to_highlight = if current_macro_call.is_some() && element.kind() != COMMENT {
153 // Inside a macro -- expand it first
154 let token = match element.clone().into_token() {
155 Some(it) if it.parent().kind() == TOKEN_TREE => it,
156 _ => continue,
157 };
158 let token = sema.descend_into_macros(token.clone());
159 let parent = token.parent();
160
161 // Check if macro takes a format string and remember it for highlighting later.
162 // The macros that accept a format string expand to a compiler builtin macros
163 // `format_args` and `format_args_nl`.
164 if let Some(name) = parent
165 .parent()
166 .and_then(ast::MacroCall::cast)
167 .and_then(|mc| mc.path())
168 .and_then(|p| p.segment())
169 .and_then(|s| s.name_ref())
170 {
171 match name.text().as_str() {
172 "format_args" | "format_args_nl" => {
173 format_string = parent
174 .children_with_tokens()
175 .filter(|t| t.kind() != WHITESPACE)
176 .nth(1)
177 .filter(|e| {
178 ast::String::can_cast(e.kind())
179 || ast::RawString::can_cast(e.kind())
180 })
181 }
182 _ => {}
183 }
184 }
185
186 // We only care Name and Name_ref
187 match (token.kind(), parent.kind()) {
188 (IDENT, NAME) | (IDENT, NAME_REF) => parent.into(),
189 _ => token.into(),
190 }
191 } else {
192 element.clone()
193 };
194
195 if let Some(token) = element.as_token().cloned().and_then(ast::RawString::cast) {
196 let expanded = element_to_highlight.as_token().unwrap().clone();
197 if injection::highlight_injection(&mut stack, &sema, token, expanded).is_some() {
198 continue;
199 }
200 }
201
202 let is_format_string = format_string.as_ref() == Some(&element_to_highlight);
203
204 if let Some((highlight, binding_hash)) = highlight_element(
205 &sema,
206 &mut bindings_shadow_count,
207 syntactic_name_ref_highlighting,
208 element_to_highlight.clone(),
209 ) {
210 stack.add(HighlightedRange { range, highlight, binding_hash });
211 if let Some(string) =
212 element_to_highlight.as_token().cloned().and_then(ast::String::cast)
213 {
214 if is_format_string {
215 stack.push();
216 string.lex_format_specifier(|piece_range, kind| {
217 if let Some(highlight) = highlight_format_specifier(kind) {
218 stack.add(HighlightedRange {
219 range: piece_range + range.start(),
220 highlight: highlight.into(),
221 binding_hash: None,
222 });
223 }
224 });
225 stack.pop();
226 }
227 // Highlight escape sequences
228 if let Some(char_ranges) = string.char_ranges() {
229 stack.push();
230 for (piece_range, _) in char_ranges.iter().filter(|(_, char)| char.is_ok()) {
231 if string.text()[piece_range.start().into()..].starts_with('\\') {
232 stack.add(HighlightedRange {
233 range: piece_range + range.start(),
234 highlight: HighlightTag::EscapeSequence.into(),
235 binding_hash: None,
236 });
237 }
238 }
239 stack.pop_and_inject(None);
240 }
241 } else if let Some(string) =
242 element_to_highlight.as_token().cloned().and_then(ast::RawString::cast)
243 {
244 if is_format_string {
245 stack.push();
246 string.lex_format_specifier(|piece_range, kind| {
247 if let Some(highlight) = highlight_format_specifier(kind) {
248 stack.add(HighlightedRange {
249 range: piece_range + range.start(),
250 highlight: highlight.into(),
251 binding_hash: None,
252 });
253 }
254 });
255 stack.pop();
256 }
257 }
258 }
259 }
260
261 stack.flattened()
262}
263
264#[derive(Debug)]
265struct HighlightedRangeStack {
266 stack: Vec<Vec<HighlightedRange>>,
267}
268
269/// We use a stack to implement the flattening logic for the highlighted
270/// syntax ranges.
271impl HighlightedRangeStack {
272 fn new() -> Self {
273 Self { stack: vec![Vec::new()] }
274 }
275
276 fn push(&mut self) {
277 self.stack.push(Vec::new());
278 }
279
280 /// Flattens the highlighted ranges.
281 ///
282 /// For example `#[cfg(feature = "foo")]` contains the nested ranges:
283 /// 1) parent-range: Attribute [0, 23)
284 /// 2) child-range: String [16, 21)
285 ///
286 /// The following code implements the flattening, for our example this results to:
287 /// `[Attribute [0, 16), String [16, 21), Attribute [21, 23)]`
288 fn pop(&mut self) {
289 let children = self.stack.pop().unwrap();
290 let prev = self.stack.last_mut().unwrap();
291 let needs_flattening = !children.is_empty()
292 && !prev.is_empty()
293 && prev.last().unwrap().range.contains_range(children.first().unwrap().range);
294 if !needs_flattening {
295 prev.extend(children);
296 } else {
297 let mut parent = prev.pop().unwrap();
298 for ele in children {
299 assert!(parent.range.contains_range(ele.range));
300
301 let cloned = Self::intersect(&mut parent, &ele);
302 if !parent.range.is_empty() {
303 prev.push(parent);
304 }
305 prev.push(ele);
306 parent = cloned;
307 }
308 if !parent.range.is_empty() {
309 prev.push(parent);
310 }
311 }
312 }
313
314 /// Intersects the `HighlightedRange` `parent` with `child`.
315 /// `parent` is mutated in place, becoming the range before `child`.
316 /// Returns the range (of the same type as `parent`) *after* `child`.
317 fn intersect(parent: &mut HighlightedRange, child: &HighlightedRange) -> HighlightedRange {
318 assert!(parent.range.contains_range(child.range));
319
320 let mut cloned = parent.clone();
321 parent.range = TextRange::new(parent.range.start(), child.range.start());
322 cloned.range = TextRange::new(child.range.end(), cloned.range.end());
323
324 cloned
325 }
326
327 /// Remove the `HighlightRange` of `parent` that's currently covered by `child`.
328 fn intersect_partial(parent: &mut HighlightedRange, child: &HighlightedRange) {
329 assert!(
330 parent.range.start() <= child.range.start()
331 && parent.range.end() >= child.range.start()
332 && child.range.end() > parent.range.end()
333 );
334
335 parent.range = TextRange::new(parent.range.start(), child.range.start());
336 }
337
338 /// Similar to `pop`, but can modify arbitrary prior ranges (where `pop`)
339 /// can only modify the last range currently on the stack.
340 /// Can be used to do injections that span multiple ranges, like the
341 /// doctest injection below.
342 /// If `overwrite_parent` is non-optional, the highlighting of the parent range
343 /// is overwritten with the argument.
344 ///
345 /// Note that `pop` can be simulated by `pop_and_inject(false)` but the
346 /// latter is computationally more expensive.
347 fn pop_and_inject(&mut self, overwrite_parent: Option<Highlight>) {
348 let mut children = self.stack.pop().unwrap();
349 let prev = self.stack.last_mut().unwrap();
350 children.sort_by_key(|range| range.range.start());
351 prev.sort_by_key(|range| range.range.start());
352
353 for child in children {
354 if let Some(idx) =
355 prev.iter().position(|parent| parent.range.contains_range(child.range))
356 {
357 if let Some(tag) = overwrite_parent {
358 prev[idx].highlight = tag;
359 }
360
361 let cloned = Self::intersect(&mut prev[idx], &child);
362 let insert_idx = if prev[idx].range.is_empty() {
363 prev.remove(idx);
364 idx
365 } else {
366 idx + 1
367 };
368 prev.insert(insert_idx, child);
369 if !cloned.range.is_empty() {
370 prev.insert(insert_idx + 1, cloned);
371 }
372 } else {
373 let maybe_idx =
374 prev.iter().position(|parent| parent.range.contains(child.range.start()));
375 match (overwrite_parent, maybe_idx) {
376 (Some(_), Some(idx)) => {
377 Self::intersect_partial(&mut prev[idx], &child);
378 let insert_idx = if prev[idx].range.is_empty() {
379 prev.remove(idx);
380 idx
381 } else {
382 idx + 1
383 };
384 prev.insert(insert_idx, child);
385 }
386 (_, None) => {
387 let idx = prev
388 .binary_search_by_key(&child.range.start(), |range| range.range.start())
389 .unwrap_or_else(|x| x);
390 prev.insert(idx, child);
391 }
392 _ => {
393 unreachable!("child range should be completely contained in parent range");
394 }
395 }
396 }
397 }
398 }
399
400 fn add(&mut self, range: HighlightedRange) {
401 self.stack
402 .last_mut()
403 .expect("during DFS traversal, the stack must not be empty")
404 .push(range)
405 }
406
407 fn flattened(mut self) -> Vec<HighlightedRange> {
408 assert_eq!(
409 self.stack.len(),
410 1,
411 "after DFS traversal, the stack should only contain a single element"
412 );
413 let mut res = self.stack.pop().unwrap();
414 res.sort_by_key(|range| range.range.start());
415 // Check that ranges are sorted and disjoint
416 assert!(res
417 .iter()
418 .zip(res.iter().skip(1))
419 .all(|(left, right)| left.range.end() <= right.range.start()));
420 res
421 }
422}
423
424fn highlight_format_specifier(kind: FormatSpecifier) -> Option<HighlightTag> {
425 Some(match kind {
426 FormatSpecifier::Open
427 | FormatSpecifier::Close
428 | FormatSpecifier::Colon
429 | FormatSpecifier::Fill
430 | FormatSpecifier::Align
431 | FormatSpecifier::Sign
432 | FormatSpecifier::NumberSign
433 | FormatSpecifier::DollarSign
434 | FormatSpecifier::Dot
435 | FormatSpecifier::Asterisk
436 | FormatSpecifier::QuestionMark => HighlightTag::FormatSpecifier,
437 FormatSpecifier::Integer | FormatSpecifier::Zero => HighlightTag::NumericLiteral,
438 FormatSpecifier::Identifier => HighlightTag::Local,
439 })
440}
441
442fn macro_call_range(macro_call: &ast::MacroCall) -> Option<TextRange> {
443 let path = macro_call.path()?;
444 let name_ref = path.segment()?.name_ref()?;
445
446 let range_start = name_ref.syntax().text_range().start();
447 let mut range_end = name_ref.syntax().text_range().end();
448 for sibling in path.syntax().siblings_with_tokens(Direction::Next) {
449 match sibling.kind() {
450 T![!] | IDENT => range_end = sibling.text_range().end(),
451 _ => (),
452 }
453 }
454
455 Some(TextRange::new(range_start, range_end))
456}
457
458fn highlight_element(
459 sema: &Semantics<RootDatabase>,
460 bindings_shadow_count: &mut FxHashMap<Name, u32>,
461 syntactic_name_ref_highlighting: bool,
462 element: SyntaxElement,
463) -> Option<(Highlight, Option<u64>)> {
464 let db = sema.db;
465 let mut binding_hash = None;
466 let highlight: Highlight = match element.kind() {
467 FN => {
468 bindings_shadow_count.clear();
469 return None;
470 }
471
472 // Highlight definitions depending on the "type" of the definition.
473 NAME => {
474 let name = element.into_node().and_then(ast::Name::cast).unwrap();
475 let name_kind = classify_name(sema, &name);
476
477 if let Some(NameClass::Definition(Definition::Local(local))) = &name_kind {
478 if let Some(name) = local.name(db) {
479 let shadow_count = bindings_shadow_count.entry(name.clone()).or_default();
480 *shadow_count += 1;
481 binding_hash = Some(calc_binding_hash(&name, *shadow_count))
482 }
483 };
484
485 match name_kind {
486 Some(NameClass::Definition(def)) => {
487 highlight_name(db, def) | HighlightModifier::Definition
488 }
489 Some(NameClass::ConstReference(def)) => highlight_name(db, def),
490 Some(NameClass::FieldShorthand { .. }) => HighlightTag::Field.into(),
491 None => highlight_name_by_syntax(name) | HighlightModifier::Definition,
492 }
493 }
494
495 // Highlight references like the definitions they resolve to
496 NAME_REF if element.ancestors().any(|it| it.kind() == ATTR) => {
497 Highlight::from(HighlightTag::Function) | HighlightModifier::Attribute
498 }
499 NAME_REF => {
500 let name_ref = element.into_node().and_then(ast::NameRef::cast).unwrap();
501 match classify_name_ref(sema, &name_ref) {
502 Some(name_kind) => match name_kind {
503 NameRefClass::Definition(def) => {
504 if let Definition::Local(local) = &def {
505 if let Some(name) = local.name(db) {
506 let shadow_count =
507 bindings_shadow_count.entry(name.clone()).or_default();
508 binding_hash = Some(calc_binding_hash(&name, *shadow_count))
509 }
510 };
511 highlight_name(db, def)
512 }
513 NameRefClass::FieldShorthand { .. } => HighlightTag::Field.into(),
514 },
515 None if syntactic_name_ref_highlighting => highlight_name_ref_by_syntax(name_ref),
516 None => HighlightTag::UnresolvedReference.into(),
517 }
518 }
519
520 // Simple token-based highlighting
521 COMMENT => {
522 let comment = element.into_token().and_then(ast::Comment::cast)?;
523 let h = HighlightTag::Comment;
524 match comment.kind().doc {
525 Some(_) => h | HighlightModifier::Documentation,
526 None => h.into(),
527 }
528 }
529 STRING | RAW_STRING | RAW_BYTE_STRING | BYTE_STRING => HighlightTag::StringLiteral.into(),
530 ATTR => HighlightTag::Attribute.into(),
531 INT_NUMBER | FLOAT_NUMBER => HighlightTag::NumericLiteral.into(),
532 BYTE => HighlightTag::ByteLiteral.into(),
533 CHAR => HighlightTag::CharLiteral.into(),
534 QUESTION => Highlight::new(HighlightTag::Operator) | HighlightModifier::ControlFlow,
535 LIFETIME => {
536 let h = Highlight::new(HighlightTag::Lifetime);
537 match element.parent().map(|it| it.kind()) {
538 Some(LIFETIME_PARAM) | Some(LABEL) => h | HighlightModifier::Definition,
539 _ => h,
540 }
541 }
542 p if p.is_punct() => match p {
543 T![::] | T![->] | T![=>] | T![&] | T![..] | T![=] | T![@] => {
544 HighlightTag::Operator.into()
545 }
546 T![!] if element.parent().and_then(ast::MacroCall::cast).is_some() => {
547 HighlightTag::Macro.into()
548 }
549 T![*] if element.parent().and_then(ast::PtrType::cast).is_some() => {
550 HighlightTag::Keyword.into()
551 }
552 T![*] if element.parent().and_then(ast::PrefixExpr::cast).is_some() => {
553 let prefix_expr = element.parent().and_then(ast::PrefixExpr::cast)?;
554
555 let expr = prefix_expr.expr()?;
556 let ty = sema.type_of_expr(&expr)?;
557 if ty.is_raw_ptr() {
558 HighlightTag::Operator | HighlightModifier::Unsafe
559 } else if let Some(ast::PrefixOp::Deref) = prefix_expr.op_kind() {
560 HighlightTag::Operator.into()
561 } else {
562 HighlightTag::Punctuation.into()
563 }
564 }
565 T![-] if element.parent().and_then(ast::PrefixExpr::cast).is_some() => {
566 HighlightTag::NumericLiteral.into()
567 }
568 _ if element.parent().and_then(ast::PrefixExpr::cast).is_some() => {
569 HighlightTag::Operator.into()
570 }
571 _ if element.parent().and_then(ast::BinExpr::cast).is_some() => {
572 HighlightTag::Operator.into()
573 }
574 _ if element.parent().and_then(ast::RangeExpr::cast).is_some() => {
575 HighlightTag::Operator.into()
576 }
577 _ if element.parent().and_then(ast::RangePat::cast).is_some() => {
578 HighlightTag::Operator.into()
579 }
580 _ if element.parent().and_then(ast::RestPat::cast).is_some() => {
581 HighlightTag::Operator.into()
582 }
583 _ if element.parent().and_then(ast::Attr::cast).is_some() => {
584 HighlightTag::Attribute.into()
585 }
586 _ => HighlightTag::Punctuation.into(),
587 },
588
589 k if k.is_keyword() => {
590 let h = Highlight::new(HighlightTag::Keyword);
591 match k {
592 T![break]
593 | T![continue]
594 | T![else]
595 | T![if]
596 | T![loop]
597 | T![match]
598 | T![return]
599 | T![while]
600 | T![in] => h | HighlightModifier::ControlFlow,
601 T![for] if !is_child_of_impl(&element) => h | HighlightModifier::ControlFlow,
602 T![unsafe] => h | HighlightModifier::Unsafe,
603 T![true] | T![false] => HighlightTag::BoolLiteral.into(),
604 T![self] => {
605 let self_param_is_mut = element
606 .parent()
607 .and_then(ast::SelfParam::cast)
608 .and_then(|p| p.mut_token())
609 .is_some();
610 // closure to enforce lazyness
611 let self_path = || {
612 sema.resolve_path(&element.parent()?.parent().and_then(ast::Path::cast)?)
613 };
614 if self_param_is_mut
615 || matches!(self_path(),
616 Some(hir::PathResolution::Local(local))
617 if local.is_self(db)
618 && (local.is_mut(db) || local.ty(db).is_mutable_reference())
619 )
620 {
621 HighlightTag::SelfKeyword | HighlightModifier::Mutable
622 } else {
623 HighlightTag::SelfKeyword.into()
624 }
625 }
626 _ => h,
627 }
628 }
629
630 _ => return None,
631 };
632
633 return Some((highlight, binding_hash));
634
635 fn calc_binding_hash(name: &Name, shadow_count: u32) -> u64 {
636 fn hash<T: std::hash::Hash + std::fmt::Debug>(x: T) -> u64 {
637 use std::{collections::hash_map::DefaultHasher, hash::Hasher};
638
639 let mut hasher = DefaultHasher::new();
640 x.hash(&mut hasher);
641 hasher.finish()
642 }
643
644 hash((name, shadow_count))
645 }
646}
647
648fn is_child_of_impl(element: &SyntaxElement) -> bool {
649 match element.parent() {
650 Some(e) => e.kind() == IMPL,
651 _ => false,
652 }
653}
654
655fn highlight_name(db: &RootDatabase, def: Definition) -> Highlight {
656 match def {
657 Definition::Macro(_) => HighlightTag::Macro,
658 Definition::Field(_) => HighlightTag::Field,
659 Definition::ModuleDef(def) => match def {
660 hir::ModuleDef::Module(_) => HighlightTag::Module,
661 hir::ModuleDef::Function(func) => {
662 let mut h = HighlightTag::Function.into();
663 if func.is_unsafe(db) {
664 h |= HighlightModifier::Unsafe;
665 }
666 return h;
667 }
668 hir::ModuleDef::Adt(hir::Adt::Struct(_)) => HighlightTag::Struct,
669 hir::ModuleDef::Adt(hir::Adt::Enum(_)) => HighlightTag::Enum,
670 hir::ModuleDef::Adt(hir::Adt::Union(_)) => HighlightTag::Union,
671 hir::ModuleDef::EnumVariant(_) => HighlightTag::EnumVariant,
672 hir::ModuleDef::Const(_) => HighlightTag::Constant,
673 hir::ModuleDef::Trait(_) => HighlightTag::Trait,
674 hir::ModuleDef::TypeAlias(_) => HighlightTag::TypeAlias,
675 hir::ModuleDef::BuiltinType(_) => HighlightTag::BuiltinType,
676 hir::ModuleDef::Static(s) => {
677 let mut h = Highlight::new(HighlightTag::Static);
678 if s.is_mut(db) {
679 h |= HighlightModifier::Mutable;
680 h |= HighlightModifier::Unsafe;
681 }
682 return h;
683 }
684 },
685 Definition::SelfType(_) => HighlightTag::SelfType,
686 Definition::TypeParam(_) => HighlightTag::TypeParam,
687 Definition::Local(local) => {
688 let tag =
689 if local.is_param(db) { HighlightTag::ValueParam } else { HighlightTag::Local };
690 let mut h = Highlight::new(tag);
691 if local.is_mut(db) || local.ty(db).is_mutable_reference() {
692 h |= HighlightModifier::Mutable;
693 }
694 return h;
695 }
696 }
697 .into()
698}
699
700fn highlight_name_by_syntax(name: ast::Name) -> Highlight {
701 let default = HighlightTag::UnresolvedReference;
702
703 let parent = match name.syntax().parent() {
704 Some(it) => it,
705 _ => return default.into(),
706 };
707
708 let tag = match parent.kind() {
709 STRUCT => HighlightTag::Struct,
710 ENUM => HighlightTag::Enum,
711 UNION => HighlightTag::Union,
712 TRAIT => HighlightTag::Trait,
713 TYPE_ALIAS => HighlightTag::TypeAlias,
714 TYPE_PARAM => HighlightTag::TypeParam,
715 RECORD_FIELD => HighlightTag::Field,
716 MODULE => HighlightTag::Module,
717 FN => HighlightTag::Function,
718 CONST => HighlightTag::Constant,
719 STATIC => HighlightTag::Static,
720 VARIANT => HighlightTag::EnumVariant,
721 IDENT_PAT => HighlightTag::Local,
722 _ => default,
723 };
724
725 tag.into()
726}
727
728fn highlight_name_ref_by_syntax(name: ast::NameRef) -> Highlight {
729 let default = HighlightTag::UnresolvedReference;
730
731 let parent = match name.syntax().parent() {
732 Some(it) => it,
733 _ => return default.into(),
734 };
735
736 let tag = match parent.kind() {
737 METHOD_CALL_EXPR => HighlightTag::Function,
738 FIELD_EXPR => HighlightTag::Field,
739 PATH_SEGMENT => {
740 let path = match parent.parent().and_then(ast::Path::cast) {
741 Some(it) => it,
742 _ => return default.into(),
743 };
744 let expr = match path.syntax().parent().and_then(ast::PathExpr::cast) {
745 Some(it) => it,
746 _ => {
747 // within path, decide whether it is module or adt by checking for uppercase name
748 return if name.text().chars().next().unwrap_or_default().is_uppercase() {
749 HighlightTag::Struct
750 } else {
751 HighlightTag::Module
752 }
753 .into();
754 }
755 };
756 let parent = match expr.syntax().parent() {
757 Some(it) => it,
758 None => return default.into(),
759 };
760
761 match parent.kind() {
762 CALL_EXPR => HighlightTag::Function,
763 _ => {
764 if name.text().chars().next().unwrap_or_default().is_uppercase() {
765 HighlightTag::Struct
766 } else {
767 HighlightTag::Constant
768 }
769 }
770 }
771 }
772 _ => default,
773 };
774
775 tag.into()
776}
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-20 14:43:58 +0100