1pub use crate::{
2 diagnostic_set::DiagnosticSet,
3 highlight_map::{HighlightId, HighlightMap},
4 markdown::ParsedMarkdown,
5 proto, Grammar, Language, LanguageRegistry,
6};
7use crate::{
8 diagnostic_set::{DiagnosticEntry, DiagnosticGroup},
9 language_settings::{language_settings, IndentGuideSettings, LanguageSettings},
10 markdown::parse_markdown,
11 outline::OutlineItem,
12 syntax_map::{
13 SyntaxLayer, SyntaxMap, SyntaxMapCapture, SyntaxMapCaptures, SyntaxMapMatch,
14 SyntaxMapMatches, SyntaxSnapshot, ToTreeSitterPoint,
15 },
16 task_context::RunnableRange,
17 LanguageScope, Outline, OutlineConfig, RunnableCapture, RunnableTag,
18};
19use anyhow::{anyhow, Context, Result};
20use async_watch as watch;
21pub use clock::ReplicaId;
22use futures::channel::oneshot;
23use gpui::{
24 AnyElement, AppContext, EventEmitter, HighlightStyle, ModelContext, Pixels, Task, TaskLabel,
25 WindowContext,
26};
27use lsp::LanguageServerId;
28use parking_lot::Mutex;
29use serde_json::Value;
30use similar::{ChangeTag, TextDiff};
31use smallvec::SmallVec;
32use smol::future::yield_now;
33use std::{
34 any::Any,
35 cell::Cell,
36 cmp::{self, Ordering, Reverse},
37 collections::BTreeMap,
38 ffi::OsStr,
39 fmt,
40 future::Future,
41 iter::{self, Iterator, Peekable},
42 mem,
43 ops::{Deref, DerefMut, Range},
44 path::{Path, PathBuf},
45 str,
46 sync::{Arc, LazyLock},
47 time::{Duration, Instant, SystemTime},
48 vec,
49};
50use sum_tree::TreeMap;
51use text::operation_queue::OperationQueue;
52use text::*;
53pub use text::{
54 Anchor, Bias, Buffer as TextBuffer, BufferId, BufferSnapshot as TextBufferSnapshot, Edit,
55 OffsetRangeExt, OffsetUtf16, Patch, Point, PointUtf16, Rope, Selection, SelectionGoal,
56 Subscription, TextDimension, TextSummary, ToOffset, ToOffsetUtf16, ToPoint, ToPointUtf16,
57 Transaction, TransactionId, Unclipped,
58};
59use theme::SyntaxTheme;
60#[cfg(any(test, feature = "test-support"))]
61use util::RandomCharIter;
62use util::RangeExt;
63
64#[cfg(any(test, feature = "test-support"))]
65pub use {tree_sitter_rust, tree_sitter_typescript};
66
67pub use lsp::DiagnosticSeverity;
68
69/// A label for the background task spawned by the buffer to compute
70/// a diff against the contents of its file.
71pub static BUFFER_DIFF_TASK: LazyLock<TaskLabel> = LazyLock::new(|| TaskLabel::new());
72
73/// Indicate whether a [Buffer] has permissions to edit.
74#[derive(PartialEq, Clone, Copy, Debug)]
75pub enum Capability {
76 /// The buffer is a mutable replica.
77 ReadWrite,
78 /// The buffer is a read-only replica.
79 ReadOnly,
80}
81
82pub type BufferRow = u32;
83
84/// An in-memory representation of a source code file, including its text,
85/// syntax trees, git status, and diagnostics.
86pub struct Buffer {
87 text: TextBuffer,
88 diff_base: Option<Rope>,
89 git_diff: git::diff::BufferDiff,
90 file: Option<Arc<dyn File>>,
91 /// The mtime of the file when this buffer was last loaded from
92 /// or saved to disk.
93 saved_mtime: Option<SystemTime>,
94 /// The version vector when this buffer was last loaded from
95 /// or saved to disk.
96 saved_version: clock::Global,
97 preview_version: clock::Global,
98 transaction_depth: usize,
99 was_dirty_before_starting_transaction: Option<bool>,
100 reload_task: Option<Task<Result<()>>>,
101 language: Option<Arc<Language>>,
102 autoindent_requests: Vec<Arc<AutoindentRequest>>,
103 pending_autoindent: Option<Task<()>>,
104 sync_parse_timeout: Duration,
105 syntax_map: Mutex<SyntaxMap>,
106 parsing_in_background: bool,
107 parse_status: (watch::Sender<ParseStatus>, watch::Receiver<ParseStatus>),
108 non_text_state_update_count: usize,
109 diagnostics: SmallVec<[(LanguageServerId, DiagnosticSet); 2]>,
110 remote_selections: TreeMap<ReplicaId, SelectionSet>,
111 diagnostics_timestamp: clock::Lamport,
112 completion_triggers: Vec<String>,
113 completion_triggers_timestamp: clock::Lamport,
114 deferred_ops: OperationQueue<Operation>,
115 capability: Capability,
116 has_conflict: bool,
117 diff_base_version: usize,
118 /// Memoize calls to has_changes_since(saved_version).
119 /// The contents of a cell are (self.version, has_changes) at the time of a last call.
120 has_unsaved_edits: Cell<(clock::Global, bool)>,
121}
122
123#[derive(Copy, Clone, Debug, PartialEq, Eq)]
124pub enum ParseStatus {
125 Idle,
126 Parsing,
127}
128
129/// An immutable, cheaply cloneable representation of a fixed
130/// state of a buffer.
131pub struct BufferSnapshot {
132 text: text::BufferSnapshot,
133 git_diff: git::diff::BufferDiff,
134 pub(crate) syntax: SyntaxSnapshot,
135 file: Option<Arc<dyn File>>,
136 diagnostics: SmallVec<[(LanguageServerId, DiagnosticSet); 2]>,
137 remote_selections: TreeMap<ReplicaId, SelectionSet>,
138 language: Option<Arc<Language>>,
139 non_text_state_update_count: usize,
140}
141
142/// The kind and amount of indentation in a particular line. For now,
143/// assumes that indentation is all the same character.
144#[derive(Clone, Copy, Debug, PartialEq, Eq, Default)]
145pub struct IndentSize {
146 /// The number of bytes that comprise the indentation.
147 pub len: u32,
148 /// The kind of whitespace used for indentation.
149 pub kind: IndentKind,
150}
151
152/// A whitespace character that's used for indentation.
153#[derive(Clone, Copy, Debug, PartialEq, Eq, Default)]
154pub enum IndentKind {
155 /// An ASCII space character.
156 #[default]
157 Space,
158 /// An ASCII tab character.
159 Tab,
160}
161
162/// The shape of a selection cursor.
163#[derive(Copy, Clone, PartialEq, Eq, Debug, Default)]
164pub enum CursorShape {
165 /// A vertical bar
166 #[default]
167 Bar,
168 /// A block that surrounds the following character
169 Block,
170 /// An underline that runs along the following character
171 Underscore,
172 /// A box drawn around the following character
173 Hollow,
174}
175
176#[derive(Clone, Debug)]
177struct SelectionSet {
178 line_mode: bool,
179 cursor_shape: CursorShape,
180 selections: Arc<[Selection<Anchor>]>,
181 lamport_timestamp: clock::Lamport,
182}
183
184/// A diagnostic associated with a certain range of a buffer.
185#[derive(Clone, Debug, PartialEq, Eq)]
186pub struct Diagnostic {
187 /// The name of the service that produced this diagnostic.
188 pub source: Option<String>,
189 /// A machine-readable code that identifies this diagnostic.
190 pub code: Option<String>,
191 /// Whether this diagnostic is a hint, warning, or error.
192 pub severity: DiagnosticSeverity,
193 /// The human-readable message associated with this diagnostic.
194 pub message: String,
195 /// An id that identifies the group to which this diagnostic belongs.
196 ///
197 /// When a language server produces a diagnostic with
198 /// one or more associated diagnostics, those diagnostics are all
199 /// assigned a single group id.
200 pub group_id: usize,
201 /// Whether this diagnostic is the primary diagnostic for its group.
202 ///
203 /// In a given group, the primary diagnostic is the top-level diagnostic
204 /// returned by the language server. The non-primary diagnostics are the
205 /// associated diagnostics.
206 pub is_primary: bool,
207 /// Whether this diagnostic is considered to originate from an analysis of
208 /// files on disk, as opposed to any unsaved buffer contents. This is a
209 /// property of a given diagnostic source, and is configured for a given
210 /// language server via the [`LspAdapter::disk_based_diagnostic_sources`](crate::LspAdapter::disk_based_diagnostic_sources) method
211 /// for the language server.
212 pub is_disk_based: bool,
213 /// Whether this diagnostic marks unnecessary code.
214 pub is_unnecessary: bool,
215 /// Data from language server that produced this diagnostic. Passed back to the LS when we request code actions for this diagnostic.
216 pub data: Option<Value>,
217}
218
219/// TODO - move this into the `project` crate and make it private.
220pub async fn prepare_completion_documentation(
221 documentation: &lsp::Documentation,
222 language_registry: &Arc<LanguageRegistry>,
223 language: Option<Arc<Language>>,
224) -> Documentation {
225 match documentation {
226 lsp::Documentation::String(text) => {
227 if text.lines().count() <= 1 {
228 Documentation::SingleLine(text.clone())
229 } else {
230 Documentation::MultiLinePlainText(text.clone())
231 }
232 }
233
234 lsp::Documentation::MarkupContent(lsp::MarkupContent { kind, value }) => match kind {
235 lsp::MarkupKind::PlainText => {
236 if value.lines().count() <= 1 {
237 Documentation::SingleLine(value.clone())
238 } else {
239 Documentation::MultiLinePlainText(value.clone())
240 }
241 }
242
243 lsp::MarkupKind::Markdown => {
244 let parsed = parse_markdown(value, language_registry, language).await;
245 Documentation::MultiLineMarkdown(parsed)
246 }
247 },
248 }
249}
250
251/// Documentation associated with a [`Completion`].
252#[derive(Clone, Debug)]
253pub enum Documentation {
254 /// There is no documentation for this completion.
255 Undocumented,
256 /// A single line of documentation.
257 SingleLine(String),
258 /// Multiple lines of plain text documentation.
259 MultiLinePlainText(String),
260 /// Markdown documentation.
261 MultiLineMarkdown(ParsedMarkdown),
262}
263
264/// An operation used to synchronize this buffer with its other replicas.
265#[derive(Clone, Debug, PartialEq)]
266pub enum Operation {
267 /// A text operation.
268 Buffer(text::Operation),
269
270 /// An update to the buffer's diagnostics.
271 UpdateDiagnostics {
272 /// The id of the language server that produced the new diagnostics.
273 server_id: LanguageServerId,
274 /// The diagnostics.
275 diagnostics: Arc<[DiagnosticEntry<Anchor>]>,
276 /// The buffer's lamport timestamp.
277 lamport_timestamp: clock::Lamport,
278 },
279
280 /// An update to the most recent selections in this buffer.
281 UpdateSelections {
282 /// The selections.
283 selections: Arc<[Selection<Anchor>]>,
284 /// The buffer's lamport timestamp.
285 lamport_timestamp: clock::Lamport,
286 /// Whether the selections are in 'line mode'.
287 line_mode: bool,
288 /// The [`CursorShape`] associated with these selections.
289 cursor_shape: CursorShape,
290 },
291
292 /// An update to the characters that should trigger autocompletion
293 /// for this buffer.
294 UpdateCompletionTriggers {
295 /// The characters that trigger autocompletion.
296 triggers: Vec<String>,
297 /// The buffer's lamport timestamp.
298 lamport_timestamp: clock::Lamport,
299 },
300}
301
302/// An event that occurs in a buffer.
303#[derive(Clone, Debug, PartialEq)]
304pub enum Event {
305 /// The buffer was changed in a way that must be
306 /// propagated to its other replicas.
307 Operation(Operation),
308 /// The buffer was edited.
309 Edited,
310 /// The buffer's `dirty` bit changed.
311 DirtyChanged,
312 /// The buffer was saved.
313 Saved,
314 /// The buffer's file was changed on disk.
315 FileHandleChanged,
316 /// The buffer was reloaded.
317 Reloaded,
318 /// The buffer's diff_base changed.
319 DiffBaseChanged,
320 /// Buffer's excerpts for a certain diff base were recalculated.
321 DiffUpdated,
322 /// The buffer's language was changed.
323 LanguageChanged,
324 /// The buffer's syntax trees were updated.
325 Reparsed,
326 /// The buffer's diagnostics were updated.
327 DiagnosticsUpdated,
328 /// The buffer gained or lost editing capabilities.
329 CapabilityChanged,
330 /// The buffer was explicitly requested to close.
331 Closed,
332 /// The buffer was discarded when closing.
333 Discarded,
334}
335
336/// The file associated with a buffer.
337pub trait File: Send + Sync {
338 /// Returns the [`LocalFile`] associated with this file, if the
339 /// file is local.
340 fn as_local(&self) -> Option<&dyn LocalFile>;
341
342 /// Returns whether this file is local.
343 fn is_local(&self) -> bool {
344 self.as_local().is_some()
345 }
346
347 /// Returns the file's mtime.
348 fn mtime(&self) -> Option<SystemTime>;
349
350 /// Returns the path of this file relative to the worktree's root directory.
351 fn path(&self) -> &Arc<Path>;
352
353 /// Returns the path of this file relative to the worktree's parent directory (this means it
354 /// includes the name of the worktree's root folder).
355 fn full_path(&self, cx: &AppContext) -> PathBuf;
356
357 /// Returns the last component of this handle's absolute path. If this handle refers to the root
358 /// of its worktree, then this method will return the name of the worktree itself.
359 fn file_name<'a>(&'a self, cx: &'a AppContext) -> &'a OsStr;
360
361 /// Returns the id of the worktree to which this file belongs.
362 ///
363 /// This is needed for looking up project-specific settings.
364 fn worktree_id(&self) -> usize;
365
366 /// Returns whether the file has been deleted.
367 fn is_deleted(&self) -> bool;
368
369 /// Returns whether the file existed on disk at one point
370 fn is_created(&self) -> bool {
371 self.mtime().is_some()
372 }
373
374 /// Converts this file into an [`Any`] trait object.
375 fn as_any(&self) -> &dyn Any;
376
377 /// Converts this file into a protobuf message.
378 fn to_proto(&self, cx: &AppContext) -> rpc::proto::File;
379
380 /// Return whether Zed considers this to be a private file.
381 fn is_private(&self) -> bool;
382}
383
384/// The file associated with a buffer, in the case where the file is on the local disk.
385pub trait LocalFile: File {
386 /// Returns the absolute path of this file
387 fn abs_path(&self, cx: &AppContext) -> PathBuf;
388
389 /// Loads the file's contents from disk.
390 fn load(&self, cx: &AppContext) -> Task<Result<String>>;
391
392 /// Returns true if the file should not be shared with collaborators.
393 fn is_private(&self, _: &AppContext) -> bool {
394 false
395 }
396}
397
398/// The auto-indent behavior associated with an editing operation.
399/// For some editing operations, each affected line of text has its
400/// indentation recomputed. For other operations, the entire block
401/// of edited text is adjusted uniformly.
402#[derive(Clone, Debug)]
403pub enum AutoindentMode {
404 /// Indent each line of inserted text.
405 EachLine,
406 /// Apply the same indentation adjustment to all of the lines
407 /// in a given insertion.
408 Block {
409 /// The original indentation level of the first line of each
410 /// insertion, if it has been copied.
411 original_indent_columns: Vec<u32>,
412 },
413}
414
415#[derive(Clone)]
416struct AutoindentRequest {
417 before_edit: BufferSnapshot,
418 entries: Vec<AutoindentRequestEntry>,
419 is_block_mode: bool,
420}
421
422#[derive(Clone)]
423struct AutoindentRequestEntry {
424 /// A range of the buffer whose indentation should be adjusted.
425 range: Range<Anchor>,
426 /// Whether or not these lines should be considered brand new, for the
427 /// purpose of auto-indent. When text is not new, its indentation will
428 /// only be adjusted if the suggested indentation level has *changed*
429 /// since the edit was made.
430 first_line_is_new: bool,
431 indent_size: IndentSize,
432 original_indent_column: Option<u32>,
433}
434
435#[derive(Debug)]
436struct IndentSuggestion {
437 basis_row: u32,
438 delta: Ordering,
439 within_error: bool,
440}
441
442struct BufferChunkHighlights<'a> {
443 captures: SyntaxMapCaptures<'a>,
444 next_capture: Option<SyntaxMapCapture<'a>>,
445 stack: Vec<(usize, HighlightId)>,
446 highlight_maps: Vec<HighlightMap>,
447}
448
449/// An iterator that yields chunks of a buffer's text, along with their
450/// syntax highlights and diagnostic status.
451pub struct BufferChunks<'a> {
452 buffer_snapshot: Option<&'a BufferSnapshot>,
453 range: Range<usize>,
454 chunks: text::Chunks<'a>,
455 diagnostic_endpoints: Option<Peekable<vec::IntoIter<DiagnosticEndpoint>>>,
456 error_depth: usize,
457 warning_depth: usize,
458 information_depth: usize,
459 hint_depth: usize,
460 unnecessary_depth: usize,
461 highlights: Option<BufferChunkHighlights<'a>>,
462}
463
464/// A chunk of a buffer's text, along with its syntax highlight and
465/// diagnostic status.
466#[derive(Clone, Debug, Default)]
467pub struct Chunk<'a> {
468 /// The text of the chunk.
469 pub text: &'a str,
470 /// The syntax highlighting style of the chunk.
471 pub syntax_highlight_id: Option<HighlightId>,
472 /// The highlight style that has been applied to this chunk in
473 /// the editor.
474 pub highlight_style: Option<HighlightStyle>,
475 /// The severity of diagnostic associated with this chunk, if any.
476 pub diagnostic_severity: Option<DiagnosticSeverity>,
477 /// Whether this chunk of text is marked as unnecessary.
478 pub is_unnecessary: bool,
479 /// Whether this chunk of text was originally a tab character.
480 pub is_tab: bool,
481 /// An optional recipe for how the chunk should be presented.
482 pub renderer: Option<ChunkRenderer>,
483}
484
485/// A recipe for how the chunk should be presented.
486#[derive(Clone)]
487pub struct ChunkRenderer {
488 /// creates a custom element to represent this chunk.
489 pub render: Arc<dyn Send + Sync + Fn(&mut ChunkRendererContext) -> AnyElement>,
490 /// If true, the element is constrained to the shaped width of the text.
491 pub constrain_width: bool,
492}
493
494pub struct ChunkRendererContext<'a, 'b> {
495 pub context: &'a mut WindowContext<'b>,
496 pub max_width: Pixels,
497}
498
499impl fmt::Debug for ChunkRenderer {
500 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
501 f.debug_struct("ChunkRenderer")
502 .field("constrain_width", &self.constrain_width)
503 .finish()
504 }
505}
506
507impl<'a, 'b> Deref for ChunkRendererContext<'a, 'b> {
508 type Target = WindowContext<'b>;
509
510 fn deref(&self) -> &Self::Target {
511 self.context
512 }
513}
514
515impl<'a, 'b> DerefMut for ChunkRendererContext<'a, 'b> {
516 fn deref_mut(&mut self) -> &mut Self::Target {
517 self.context
518 }
519}
520
521/// A set of edits to a given version of a buffer, computed asynchronously.
522#[derive(Debug)]
523pub struct Diff {
524 pub(crate) base_version: clock::Global,
525 line_ending: LineEnding,
526 edits: Vec<(Range<usize>, Arc<str>)>,
527}
528
529#[derive(Clone, Copy)]
530pub(crate) struct DiagnosticEndpoint {
531 offset: usize,
532 is_start: bool,
533 severity: DiagnosticSeverity,
534 is_unnecessary: bool,
535}
536
537/// A class of characters, used for characterizing a run of text.
538#[derive(Copy, Clone, Eq, PartialEq, PartialOrd, Ord, Debug)]
539pub enum CharKind {
540 /// Whitespace.
541 Whitespace,
542 /// Punctuation.
543 Punctuation,
544 /// Word.
545 Word,
546}
547
548/// A runnable is a set of data about a region that could be resolved into a task
549pub struct Runnable {
550 pub tags: SmallVec<[RunnableTag; 1]>,
551 pub language: Arc<Language>,
552 pub buffer: BufferId,
553}
554
555#[derive(Clone, Debug, PartialEq)]
556pub struct IndentGuide {
557 pub buffer_id: BufferId,
558 pub start_row: BufferRow,
559 pub end_row: BufferRow,
560 pub depth: u32,
561 pub tab_size: u32,
562 pub settings: IndentGuideSettings,
563}
564
565impl IndentGuide {
566 pub fn indent_level(&self) -> u32 {
567 self.depth * self.tab_size
568 }
569}
570
571impl Buffer {
572 /// Create a new buffer with the given base text.
573 pub fn local<T: Into<String>>(base_text: T, cx: &mut ModelContext<Self>) -> Self {
574 Self::build(
575 TextBuffer::new(0, cx.entity_id().as_non_zero_u64().into(), base_text.into()),
576 None,
577 None,
578 Capability::ReadWrite,
579 )
580 }
581
582 /// Create a new buffer with the given base text that has proper line endings and other normalization applied.
583 pub fn local_normalized(
584 base_text_normalized: Rope,
585 line_ending: LineEnding,
586 cx: &mut ModelContext<Self>,
587 ) -> Self {
588 Self::build(
589 TextBuffer::new_normalized(
590 0,
591 cx.entity_id().as_non_zero_u64().into(),
592 line_ending,
593 base_text_normalized,
594 ),
595 None,
596 None,
597 Capability::ReadWrite,
598 )
599 }
600
601 /// Create a new buffer that is a replica of a remote buffer.
602 pub fn remote(
603 remote_id: BufferId,
604 replica_id: ReplicaId,
605 capability: Capability,
606 base_text: impl Into<String>,
607 ) -> Self {
608 Self::build(
609 TextBuffer::new(replica_id, remote_id, base_text.into()),
610 None,
611 None,
612 capability,
613 )
614 }
615
616 /// Create a new buffer that is a replica of a remote buffer, populating its
617 /// state from the given protobuf message.
618 pub fn from_proto(
619 replica_id: ReplicaId,
620 capability: Capability,
621 message: proto::BufferState,
622 file: Option<Arc<dyn File>>,
623 ) -> Result<Self> {
624 let buffer_id = BufferId::new(message.id)
625 .with_context(|| anyhow!("Could not deserialize buffer_id"))?;
626 let buffer = TextBuffer::new(replica_id, buffer_id, message.base_text);
627 let mut this = Self::build(buffer, message.diff_base, file, capability);
628 this.text.set_line_ending(proto::deserialize_line_ending(
629 rpc::proto::LineEnding::from_i32(message.line_ending)
630 .ok_or_else(|| anyhow!("missing line_ending"))?,
631 ));
632 this.saved_version = proto::deserialize_version(&message.saved_version);
633 this.saved_mtime = message.saved_mtime.map(|time| time.into());
634 Ok(this)
635 }
636
637 /// Serialize the buffer's state to a protobuf message.
638 pub fn to_proto(&self, cx: &AppContext) -> proto::BufferState {
639 proto::BufferState {
640 id: self.remote_id().into(),
641 file: self.file.as_ref().map(|f| f.to_proto(cx)),
642 base_text: self.base_text().to_string(),
643 diff_base: self.diff_base.as_ref().map(|h| h.to_string()),
644 line_ending: proto::serialize_line_ending(self.line_ending()) as i32,
645 saved_version: proto::serialize_version(&self.saved_version),
646 saved_mtime: self.saved_mtime.map(|time| time.into()),
647 }
648 }
649
650 /// Serialize as protobufs all of the changes to the buffer since the given version.
651 pub fn serialize_ops(
652 &self,
653 since: Option<clock::Global>,
654 cx: &AppContext,
655 ) -> Task<Vec<proto::Operation>> {
656 let mut operations = Vec::new();
657 operations.extend(self.deferred_ops.iter().map(proto::serialize_operation));
658
659 operations.extend(self.remote_selections.iter().map(|(_, set)| {
660 proto::serialize_operation(&Operation::UpdateSelections {
661 selections: set.selections.clone(),
662 lamport_timestamp: set.lamport_timestamp,
663 line_mode: set.line_mode,
664 cursor_shape: set.cursor_shape,
665 })
666 }));
667
668 for (server_id, diagnostics) in &self.diagnostics {
669 operations.push(proto::serialize_operation(&Operation::UpdateDiagnostics {
670 lamport_timestamp: self.diagnostics_timestamp,
671 server_id: *server_id,
672 diagnostics: diagnostics.iter().cloned().collect(),
673 }));
674 }
675
676 operations.push(proto::serialize_operation(
677 &Operation::UpdateCompletionTriggers {
678 triggers: self.completion_triggers.clone(),
679 lamport_timestamp: self.completion_triggers_timestamp,
680 },
681 ));
682
683 let text_operations = self.text.operations().clone();
684 cx.background_executor().spawn(async move {
685 let since = since.unwrap_or_default();
686 operations.extend(
687 text_operations
688 .iter()
689 .filter(|(_, op)| !since.observed(op.timestamp()))
690 .map(|(_, op)| proto::serialize_operation(&Operation::Buffer(op.clone()))),
691 );
692 operations.sort_unstable_by_key(proto::lamport_timestamp_for_operation);
693 operations
694 })
695 }
696
697 /// Assign a language to the buffer, returning the buffer.
698 pub fn with_language(mut self, language: Arc<Language>, cx: &mut ModelContext<Self>) -> Self {
699 self.set_language(Some(language), cx);
700 self
701 }
702
703 /// Returns the [Capability] of this buffer.
704 pub fn capability(&self) -> Capability {
705 self.capability
706 }
707
708 /// Whether this buffer can only be read.
709 pub fn read_only(&self) -> bool {
710 self.capability == Capability::ReadOnly
711 }
712
713 /// Builds a [Buffer] with the given underlying [TextBuffer], diff base, [File] and [Capability].
714 pub fn build(
715 buffer: TextBuffer,
716 diff_base: Option<String>,
717 file: Option<Arc<dyn File>>,
718 capability: Capability,
719 ) -> Self {
720 let saved_mtime = file.as_ref().and_then(|file| file.mtime());
721
722 Self {
723 saved_mtime,
724 saved_version: buffer.version(),
725 preview_version: buffer.version(),
726 reload_task: None,
727 transaction_depth: 0,
728 was_dirty_before_starting_transaction: None,
729 has_unsaved_edits: Cell::new((buffer.version(), false)),
730 text: buffer,
731 diff_base: diff_base
732 .map(|mut raw_diff_base| {
733 LineEnding::normalize(&mut raw_diff_base);
734 raw_diff_base
735 })
736 .map(Rope::from),
737 diff_base_version: 0,
738 git_diff: git::diff::BufferDiff::new(),
739 file,
740 capability,
741 syntax_map: Mutex::new(SyntaxMap::new()),
742 parsing_in_background: false,
743 non_text_state_update_count: 0,
744 sync_parse_timeout: Duration::from_millis(1),
745 parse_status: async_watch::channel(ParseStatus::Idle),
746 autoindent_requests: Default::default(),
747 pending_autoindent: Default::default(),
748 language: None,
749 remote_selections: Default::default(),
750 diagnostics: Default::default(),
751 diagnostics_timestamp: Default::default(),
752 completion_triggers: Default::default(),
753 completion_triggers_timestamp: Default::default(),
754 deferred_ops: OperationQueue::new(),
755 has_conflict: false,
756 }
757 }
758
759 /// Retrieve a snapshot of the buffer's current state. This is computationally
760 /// cheap, and allows reading from the buffer on a background thread.
761 pub fn snapshot(&self) -> BufferSnapshot {
762 let text = self.text.snapshot();
763 let mut syntax_map = self.syntax_map.lock();
764 syntax_map.interpolate(&text);
765 let syntax = syntax_map.snapshot();
766
767 BufferSnapshot {
768 text,
769 syntax,
770 git_diff: self.git_diff.clone(),
771 file: self.file.clone(),
772 remote_selections: self.remote_selections.clone(),
773 diagnostics: self.diagnostics.clone(),
774 language: self.language.clone(),
775 non_text_state_update_count: self.non_text_state_update_count,
776 }
777 }
778
779 #[cfg(test)]
780 pub(crate) fn as_text_snapshot(&self) -> &text::BufferSnapshot {
781 &self.text
782 }
783
784 /// Retrieve a snapshot of the buffer's raw text, without any
785 /// language-related state like the syntax tree or diagnostics.
786 pub fn text_snapshot(&self) -> text::BufferSnapshot {
787 self.text.snapshot()
788 }
789
790 /// The file associated with the buffer, if any.
791 pub fn file(&self) -> Option<&Arc<dyn File>> {
792 self.file.as_ref()
793 }
794
795 /// The version of the buffer that was last saved or reloaded from disk.
796 pub fn saved_version(&self) -> &clock::Global {
797 &self.saved_version
798 }
799
800 /// The mtime of the buffer's file when the buffer was last saved or reloaded from disk.
801 pub fn saved_mtime(&self) -> Option<SystemTime> {
802 self.saved_mtime
803 }
804
805 /// Assign a language to the buffer.
806 pub fn set_language(&mut self, language: Option<Arc<Language>>, cx: &mut ModelContext<Self>) {
807 self.non_text_state_update_count += 1;
808 self.syntax_map.lock().clear();
809 self.language = language;
810 self.reparse(cx);
811 cx.emit(Event::LanguageChanged);
812 }
813
814 /// Assign a language registry to the buffer. This allows the buffer to retrieve
815 /// other languages if parts of the buffer are written in different languages.
816 pub fn set_language_registry(&mut self, language_registry: Arc<LanguageRegistry>) {
817 self.syntax_map
818 .lock()
819 .set_language_registry(language_registry);
820 }
821
822 pub fn language_registry(&self) -> Option<Arc<LanguageRegistry>> {
823 self.syntax_map.lock().language_registry()
824 }
825
826 /// Assign the buffer a new [Capability].
827 pub fn set_capability(&mut self, capability: Capability, cx: &mut ModelContext<Self>) {
828 self.capability = capability;
829 cx.emit(Event::CapabilityChanged)
830 }
831
832 /// This method is called to signal that the buffer has been saved.
833 pub fn did_save(
834 &mut self,
835 version: clock::Global,
836 mtime: Option<SystemTime>,
837 cx: &mut ModelContext<Self>,
838 ) {
839 self.saved_version = version;
840 self.has_unsaved_edits
841 .set((self.saved_version().clone(), false));
842 self.has_conflict = false;
843 self.saved_mtime = mtime;
844 cx.emit(Event::Saved);
845 cx.notify();
846 }
847
848 /// This method is called to signal that the buffer has been discarded.
849 pub fn discarded(&mut self, cx: &mut ModelContext<Self>) {
850 cx.emit(Event::Discarded);
851 cx.notify();
852 }
853
854 /// Reloads the contents of the buffer from disk.
855 pub fn reload(
856 &mut self,
857 cx: &mut ModelContext<Self>,
858 ) -> oneshot::Receiver<Option<Transaction>> {
859 let (tx, rx) = futures::channel::oneshot::channel();
860 let prev_version = self.text.version();
861 self.reload_task = Some(cx.spawn(|this, mut cx| async move {
862 let Some((new_mtime, new_text)) = this.update(&mut cx, |this, cx| {
863 let file = this.file.as_ref()?.as_local()?;
864 Some((file.mtime(), file.load(cx)))
865 })?
866 else {
867 return Ok(());
868 };
869
870 let new_text = new_text.await?;
871 let diff = this
872 .update(&mut cx, |this, cx| this.diff(new_text.clone(), cx))?
873 .await;
874 this.update(&mut cx, |this, cx| {
875 if this.version() == diff.base_version {
876 this.finalize_last_transaction();
877 this.apply_diff(diff, cx);
878 tx.send(this.finalize_last_transaction().cloned()).ok();
879 this.has_conflict = false;
880 this.did_reload(this.version(), this.line_ending(), new_mtime, cx);
881 } else {
882 if !diff.edits.is_empty()
883 || this
884 .edits_since::<usize>(&diff.base_version)
885 .next()
886 .is_some()
887 {
888 this.has_conflict = true;
889 }
890
891 this.did_reload(prev_version, this.line_ending(), this.saved_mtime, cx);
892 }
893
894 this.reload_task.take();
895 })
896 }));
897 rx
898 }
899
900 /// This method is called to signal that the buffer has been reloaded.
901 pub fn did_reload(
902 &mut self,
903 version: clock::Global,
904 line_ending: LineEnding,
905 mtime: Option<SystemTime>,
906 cx: &mut ModelContext<Self>,
907 ) {
908 self.saved_version = version;
909 self.has_unsaved_edits
910 .set((self.saved_version.clone(), false));
911 self.text.set_line_ending(line_ending);
912 self.saved_mtime = mtime;
913 cx.emit(Event::Reloaded);
914 cx.notify();
915 }
916
917 /// Updates the [File] backing this buffer. This should be called when
918 /// the file has changed or has been deleted.
919 pub fn file_updated(&mut self, new_file: Arc<dyn File>, cx: &mut ModelContext<Self>) {
920 let mut file_changed = false;
921
922 if let Some(old_file) = self.file.as_ref() {
923 if new_file.path() != old_file.path() {
924 file_changed = true;
925 }
926
927 if new_file.is_deleted() {
928 if !old_file.is_deleted() {
929 file_changed = true;
930 if !self.is_dirty() {
931 cx.emit(Event::DirtyChanged);
932 }
933 }
934 } else {
935 let new_mtime = new_file.mtime();
936 if new_mtime != old_file.mtime() {
937 file_changed = true;
938
939 if !self.is_dirty() {
940 self.reload(cx).close();
941 }
942 }
943 }
944 } else {
945 file_changed = true;
946 };
947
948 self.file = Some(new_file);
949 if file_changed {
950 self.non_text_state_update_count += 1;
951 cx.emit(Event::FileHandleChanged);
952 cx.notify();
953 }
954 }
955
956 /// Returns the current diff base, see [Buffer::set_diff_base].
957 pub fn diff_base(&self) -> Option<&Rope> {
958 self.diff_base.as_ref()
959 }
960
961 /// Sets the text that will be used to compute a Git diff
962 /// against the buffer text.
963 pub fn set_diff_base(&mut self, diff_base: Option<String>, cx: &mut ModelContext<Self>) {
964 self.diff_base = diff_base
965 .map(|mut raw_diff_base| {
966 LineEnding::normalize(&mut raw_diff_base);
967 raw_diff_base
968 })
969 .map(Rope::from);
970 self.diff_base_version += 1;
971 if let Some(recalc_task) = self.git_diff_recalc(cx) {
972 cx.spawn(|buffer, mut cx| async move {
973 recalc_task.await;
974 buffer
975 .update(&mut cx, |_, cx| {
976 cx.emit(Event::DiffBaseChanged);
977 })
978 .ok();
979 })
980 .detach();
981 }
982 }
983
984 /// Returns a number, unique per diff base set to the buffer.
985 pub fn diff_base_version(&self) -> usize {
986 self.diff_base_version
987 }
988
989 /// Recomputes the Git diff status.
990 pub fn git_diff_recalc(&mut self, cx: &mut ModelContext<Self>) -> Option<Task<()>> {
991 let diff_base = self.diff_base.clone()?;
992 let snapshot = self.snapshot();
993
994 let mut diff = self.git_diff.clone();
995 let diff = cx.background_executor().spawn(async move {
996 diff.update(&diff_base, &snapshot).await;
997 diff
998 });
999
1000 Some(cx.spawn(|this, mut cx| async move {
1001 let buffer_diff = diff.await;
1002 this.update(&mut cx, |this, cx| {
1003 this.git_diff = buffer_diff;
1004 this.non_text_state_update_count += 1;
1005 cx.emit(Event::DiffUpdated);
1006 })
1007 .ok();
1008 }))
1009 }
1010
1011 /// Returns the primary [Language] assigned to this [Buffer].
1012 pub fn language(&self) -> Option<&Arc<Language>> {
1013 self.language.as_ref()
1014 }
1015
1016 /// Returns the [Language] at the given location.
1017 pub fn language_at<D: ToOffset>(&self, position: D) -> Option<Arc<Language>> {
1018 let offset = position.to_offset(self);
1019 self.syntax_map
1020 .lock()
1021 .layers_for_range(offset..offset, &self.text)
1022 .last()
1023 .map(|info| info.language.clone())
1024 .or_else(|| self.language.clone())
1025 }
1026
1027 /// An integer version number that accounts for all updates besides
1028 /// the buffer's text itself (which is versioned via a version vector).
1029 pub fn non_text_state_update_count(&self) -> usize {
1030 self.non_text_state_update_count
1031 }
1032
1033 /// Whether the buffer is being parsed in the background.
1034 #[cfg(any(test, feature = "test-support"))]
1035 pub fn is_parsing(&self) -> bool {
1036 self.parsing_in_background
1037 }
1038
1039 /// Indicates whether the buffer contains any regions that may be
1040 /// written in a language that hasn't been loaded yet.
1041 pub fn contains_unknown_injections(&self) -> bool {
1042 self.syntax_map.lock().contains_unknown_injections()
1043 }
1044
1045 #[cfg(test)]
1046 pub fn set_sync_parse_timeout(&mut self, timeout: Duration) {
1047 self.sync_parse_timeout = timeout;
1048 }
1049
1050 /// Called after an edit to synchronize the buffer's main parse tree with
1051 /// the buffer's new underlying state.
1052 ///
1053 /// Locks the syntax map and interpolates the edits since the last reparse
1054 /// into the foreground syntax tree.
1055 ///
1056 /// Then takes a stable snapshot of the syntax map before unlocking it.
1057 /// The snapshot with the interpolated edits is sent to a background thread,
1058 /// where we ask Tree-sitter to perform an incremental parse.
1059 ///
1060 /// Meanwhile, in the foreground, we block the main thread for up to 1ms
1061 /// waiting on the parse to complete. As soon as it completes, we proceed
1062 /// synchronously, unless a 1ms timeout elapses.
1063 ///
1064 /// If we time out waiting on the parse, we spawn a second task waiting
1065 /// until the parse does complete and return with the interpolated tree still
1066 /// in the foreground. When the background parse completes, call back into
1067 /// the main thread and assign the foreground parse state.
1068 ///
1069 /// If the buffer or grammar changed since the start of the background parse,
1070 /// initiate an additional reparse recursively. To avoid concurrent parses
1071 /// for the same buffer, we only initiate a new parse if we are not already
1072 /// parsing in the background.
1073 pub fn reparse(&mut self, cx: &mut ModelContext<Self>) {
1074 if self.parsing_in_background {
1075 return;
1076 }
1077 let language = if let Some(language) = self.language.clone() {
1078 language
1079 } else {
1080 return;
1081 };
1082
1083 let text = self.text_snapshot();
1084 let parsed_version = self.version();
1085
1086 let mut syntax_map = self.syntax_map.lock();
1087 syntax_map.interpolate(&text);
1088 let language_registry = syntax_map.language_registry();
1089 let mut syntax_snapshot = syntax_map.snapshot();
1090 drop(syntax_map);
1091
1092 let parse_task = cx.background_executor().spawn({
1093 let language = language.clone();
1094 let language_registry = language_registry.clone();
1095 async move {
1096 syntax_snapshot.reparse(&text, language_registry, language);
1097 syntax_snapshot
1098 }
1099 });
1100
1101 self.parse_status.0.send(ParseStatus::Parsing).unwrap();
1102 match cx
1103 .background_executor()
1104 .block_with_timeout(self.sync_parse_timeout, parse_task)
1105 {
1106 Ok(new_syntax_snapshot) => {
1107 self.did_finish_parsing(new_syntax_snapshot, cx);
1108 return;
1109 }
1110 Err(parse_task) => {
1111 self.parsing_in_background = true;
1112 cx.spawn(move |this, mut cx| async move {
1113 let new_syntax_map = parse_task.await;
1114 this.update(&mut cx, move |this, cx| {
1115 let grammar_changed =
1116 this.language.as_ref().map_or(true, |current_language| {
1117 !Arc::ptr_eq(&language, current_language)
1118 });
1119 let language_registry_changed = new_syntax_map
1120 .contains_unknown_injections()
1121 && language_registry.map_or(false, |registry| {
1122 registry.version() != new_syntax_map.language_registry_version()
1123 });
1124 let parse_again = language_registry_changed
1125 || grammar_changed
1126 || this.version.changed_since(&parsed_version);
1127 this.did_finish_parsing(new_syntax_map, cx);
1128 this.parsing_in_background = false;
1129 if parse_again {
1130 this.reparse(cx);
1131 }
1132 })
1133 .ok();
1134 })
1135 .detach();
1136 }
1137 }
1138 }
1139
1140 fn did_finish_parsing(&mut self, syntax_snapshot: SyntaxSnapshot, cx: &mut ModelContext<Self>) {
1141 self.non_text_state_update_count += 1;
1142 self.syntax_map.lock().did_parse(syntax_snapshot);
1143 self.request_autoindent(cx);
1144 self.parse_status.0.send(ParseStatus::Idle).unwrap();
1145 cx.emit(Event::Reparsed);
1146 cx.notify();
1147 }
1148
1149 pub fn parse_status(&self) -> watch::Receiver<ParseStatus> {
1150 self.parse_status.1.clone()
1151 }
1152
1153 /// Assign to the buffer a set of diagnostics created by a given language server.
1154 pub fn update_diagnostics(
1155 &mut self,
1156 server_id: LanguageServerId,
1157 diagnostics: DiagnosticSet,
1158 cx: &mut ModelContext<Self>,
1159 ) {
1160 let lamport_timestamp = self.text.lamport_clock.tick();
1161 let op = Operation::UpdateDiagnostics {
1162 server_id,
1163 diagnostics: diagnostics.iter().cloned().collect(),
1164 lamport_timestamp,
1165 };
1166 self.apply_diagnostic_update(server_id, diagnostics, lamport_timestamp, cx);
1167 self.send_operation(op, cx);
1168 }
1169
1170 fn request_autoindent(&mut self, cx: &mut ModelContext<Self>) {
1171 if let Some(indent_sizes) = self.compute_autoindents() {
1172 let indent_sizes = cx.background_executor().spawn(indent_sizes);
1173 match cx
1174 .background_executor()
1175 .block_with_timeout(Duration::from_micros(500), indent_sizes)
1176 {
1177 Ok(indent_sizes) => self.apply_autoindents(indent_sizes, cx),
1178 Err(indent_sizes) => {
1179 self.pending_autoindent = Some(cx.spawn(|this, mut cx| async move {
1180 let indent_sizes = indent_sizes.await;
1181 this.update(&mut cx, |this, cx| {
1182 this.apply_autoindents(indent_sizes, cx);
1183 })
1184 .ok();
1185 }));
1186 }
1187 }
1188 } else {
1189 self.autoindent_requests.clear();
1190 }
1191 }
1192
1193 fn compute_autoindents(&self) -> Option<impl Future<Output = BTreeMap<u32, IndentSize>>> {
1194 let max_rows_between_yields = 100;
1195 let snapshot = self.snapshot();
1196 if snapshot.syntax.is_empty() || self.autoindent_requests.is_empty() {
1197 return None;
1198 }
1199
1200 let autoindent_requests = self.autoindent_requests.clone();
1201 Some(async move {
1202 let mut indent_sizes = BTreeMap::new();
1203 for request in autoindent_requests {
1204 // Resolve each edited range to its row in the current buffer and in the
1205 // buffer before this batch of edits.
1206 let mut row_ranges = Vec::new();
1207 let mut old_to_new_rows = BTreeMap::new();
1208 let mut language_indent_sizes_by_new_row = Vec::new();
1209 for entry in &request.entries {
1210 let position = entry.range.start;
1211 let new_row = position.to_point(&snapshot).row;
1212 let new_end_row = entry.range.end.to_point(&snapshot).row + 1;
1213 language_indent_sizes_by_new_row.push((new_row, entry.indent_size));
1214
1215 if !entry.first_line_is_new {
1216 let old_row = position.to_point(&request.before_edit).row;
1217 old_to_new_rows.insert(old_row, new_row);
1218 }
1219 row_ranges.push((new_row..new_end_row, entry.original_indent_column));
1220 }
1221
1222 // Build a map containing the suggested indentation for each of the edited lines
1223 // with respect to the state of the buffer before these edits. This map is keyed
1224 // by the rows for these lines in the current state of the buffer.
1225 let mut old_suggestions = BTreeMap::<u32, (IndentSize, bool)>::default();
1226 let old_edited_ranges =
1227 contiguous_ranges(old_to_new_rows.keys().copied(), max_rows_between_yields);
1228 let mut language_indent_sizes = language_indent_sizes_by_new_row.iter().peekable();
1229 let mut language_indent_size = IndentSize::default();
1230 for old_edited_range in old_edited_ranges {
1231 let suggestions = request
1232 .before_edit
1233 .suggest_autoindents(old_edited_range.clone())
1234 .into_iter()
1235 .flatten();
1236 for (old_row, suggestion) in old_edited_range.zip(suggestions) {
1237 if let Some(suggestion) = suggestion {
1238 let new_row = *old_to_new_rows.get(&old_row).unwrap();
1239
1240 // Find the indent size based on the language for this row.
1241 while let Some((row, size)) = language_indent_sizes.peek() {
1242 if *row > new_row {
1243 break;
1244 }
1245 language_indent_size = *size;
1246 language_indent_sizes.next();
1247 }
1248
1249 let suggested_indent = old_to_new_rows
1250 .get(&suggestion.basis_row)
1251 .and_then(|from_row| {
1252 Some(old_suggestions.get(from_row).copied()?.0)
1253 })
1254 .unwrap_or_else(|| {
1255 request
1256 .before_edit
1257 .indent_size_for_line(suggestion.basis_row)
1258 })
1259 .with_delta(suggestion.delta, language_indent_size);
1260 old_suggestions
1261 .insert(new_row, (suggested_indent, suggestion.within_error));
1262 }
1263 }
1264 yield_now().await;
1265 }
1266
1267 // In block mode, only compute indentation suggestions for the first line
1268 // of each insertion. Otherwise, compute suggestions for every inserted line.
1269 let new_edited_row_ranges = contiguous_ranges(
1270 row_ranges.iter().flat_map(|(range, _)| {
1271 if request.is_block_mode {
1272 range.start..range.start + 1
1273 } else {
1274 range.clone()
1275 }
1276 }),
1277 max_rows_between_yields,
1278 );
1279
1280 // Compute new suggestions for each line, but only include them in the result
1281 // if they differ from the old suggestion for that line.
1282 let mut language_indent_sizes = language_indent_sizes_by_new_row.iter().peekable();
1283 let mut language_indent_size = IndentSize::default();
1284 for new_edited_row_range in new_edited_row_ranges {
1285 let suggestions = snapshot
1286 .suggest_autoindents(new_edited_row_range.clone())
1287 .into_iter()
1288 .flatten();
1289 for (new_row, suggestion) in new_edited_row_range.zip(suggestions) {
1290 if let Some(suggestion) = suggestion {
1291 // Find the indent size based on the language for this row.
1292 while let Some((row, size)) = language_indent_sizes.peek() {
1293 if *row > new_row {
1294 break;
1295 }
1296 language_indent_size = *size;
1297 language_indent_sizes.next();
1298 }
1299
1300 let suggested_indent = indent_sizes
1301 .get(&suggestion.basis_row)
1302 .copied()
1303 .unwrap_or_else(|| {
1304 snapshot.indent_size_for_line(suggestion.basis_row)
1305 })
1306 .with_delta(suggestion.delta, language_indent_size);
1307 if old_suggestions.get(&new_row).map_or(
1308 true,
1309 |(old_indentation, was_within_error)| {
1310 suggested_indent != *old_indentation
1311 && (!suggestion.within_error || *was_within_error)
1312 },
1313 ) {
1314 indent_sizes.insert(new_row, suggested_indent);
1315 }
1316 }
1317 }
1318 yield_now().await;
1319 }
1320
1321 // For each block of inserted text, adjust the indentation of the remaining
1322 // lines of the block by the same amount as the first line was adjusted.
1323 if request.is_block_mode {
1324 for (row_range, original_indent_column) in
1325 row_ranges
1326 .into_iter()
1327 .filter_map(|(range, original_indent_column)| {
1328 if range.len() > 1 {
1329 Some((range, original_indent_column?))
1330 } else {
1331 None
1332 }
1333 })
1334 {
1335 let new_indent = indent_sizes
1336 .get(&row_range.start)
1337 .copied()
1338 .unwrap_or_else(|| snapshot.indent_size_for_line(row_range.start));
1339 let delta = new_indent.len as i64 - original_indent_column as i64;
1340 if delta != 0 {
1341 for row in row_range.skip(1) {
1342 indent_sizes.entry(row).or_insert_with(|| {
1343 let mut size = snapshot.indent_size_for_line(row);
1344 if size.kind == new_indent.kind {
1345 match delta.cmp(&0) {
1346 Ordering::Greater => size.len += delta as u32,
1347 Ordering::Less => {
1348 size.len = size.len.saturating_sub(-delta as u32)
1349 }
1350 Ordering::Equal => {}
1351 }
1352 }
1353 size
1354 });
1355 }
1356 }
1357 }
1358 }
1359 }
1360
1361 indent_sizes
1362 })
1363 }
1364
1365 fn apply_autoindents(
1366 &mut self,
1367 indent_sizes: BTreeMap<u32, IndentSize>,
1368 cx: &mut ModelContext<Self>,
1369 ) {
1370 self.autoindent_requests.clear();
1371
1372 let edits: Vec<_> = indent_sizes
1373 .into_iter()
1374 .filter_map(|(row, indent_size)| {
1375 let current_size = indent_size_for_line(self, row);
1376 Self::edit_for_indent_size_adjustment(row, current_size, indent_size)
1377 })
1378 .collect();
1379
1380 let preserve_preview = self.preserve_preview();
1381 self.edit(edits, None, cx);
1382 if preserve_preview {
1383 self.refresh_preview();
1384 }
1385 }
1386
1387 /// Create a minimal edit that will cause the given row to be indented
1388 /// with the given size. After applying this edit, the length of the line
1389 /// will always be at least `new_size.len`.
1390 pub fn edit_for_indent_size_adjustment(
1391 row: u32,
1392 current_size: IndentSize,
1393 new_size: IndentSize,
1394 ) -> Option<(Range<Point>, String)> {
1395 if new_size.kind == current_size.kind {
1396 match new_size.len.cmp(¤t_size.len) {
1397 Ordering::Greater => {
1398 let point = Point::new(row, 0);
1399 Some((
1400 point..point,
1401 iter::repeat(new_size.char())
1402 .take((new_size.len - current_size.len) as usize)
1403 .collect::<String>(),
1404 ))
1405 }
1406
1407 Ordering::Less => Some((
1408 Point::new(row, 0)..Point::new(row, current_size.len - new_size.len),
1409 String::new(),
1410 )),
1411
1412 Ordering::Equal => None,
1413 }
1414 } else {
1415 Some((
1416 Point::new(row, 0)..Point::new(row, current_size.len),
1417 iter::repeat(new_size.char())
1418 .take(new_size.len as usize)
1419 .collect::<String>(),
1420 ))
1421 }
1422 }
1423
1424 /// Spawns a background task that asynchronously computes a `Diff` between the buffer's text
1425 /// and the given new text.
1426 pub fn diff(&self, mut new_text: String, cx: &AppContext) -> Task<Diff> {
1427 let old_text = self.as_rope().clone();
1428 let base_version = self.version();
1429 cx.background_executor()
1430 .spawn_labeled(*BUFFER_DIFF_TASK, async move {
1431 let old_text = old_text.to_string();
1432 let line_ending = LineEnding::detect(&new_text);
1433 LineEnding::normalize(&mut new_text);
1434
1435 let diff = TextDiff::from_chars(old_text.as_str(), new_text.as_str());
1436 let empty: Arc<str> = Arc::default();
1437
1438 let mut edits = Vec::new();
1439 let mut old_offset = 0;
1440 let mut new_offset = 0;
1441 let mut last_edit: Option<(Range<usize>, Range<usize>)> = None;
1442 for change in diff.iter_all_changes().map(Some).chain([None]) {
1443 if let Some(change) = &change {
1444 let len = change.value().len();
1445 match change.tag() {
1446 ChangeTag::Equal => {
1447 old_offset += len;
1448 new_offset += len;
1449 }
1450 ChangeTag::Delete => {
1451 let old_end_offset = old_offset + len;
1452 if let Some((last_old_range, _)) = &mut last_edit {
1453 last_old_range.end = old_end_offset;
1454 } else {
1455 last_edit =
1456 Some((old_offset..old_end_offset, new_offset..new_offset));
1457 }
1458 old_offset = old_end_offset;
1459 }
1460 ChangeTag::Insert => {
1461 let new_end_offset = new_offset + len;
1462 if let Some((_, last_new_range)) = &mut last_edit {
1463 last_new_range.end = new_end_offset;
1464 } else {
1465 last_edit =
1466 Some((old_offset..old_offset, new_offset..new_end_offset));
1467 }
1468 new_offset = new_end_offset;
1469 }
1470 }
1471 }
1472
1473 if let Some((old_range, new_range)) = &last_edit {
1474 if old_offset > old_range.end
1475 || new_offset > new_range.end
1476 || change.is_none()
1477 {
1478 let text = if new_range.is_empty() {
1479 empty.clone()
1480 } else {
1481 new_text[new_range.clone()].into()
1482 };
1483 edits.push((old_range.clone(), text));
1484 last_edit.take();
1485 }
1486 }
1487 }
1488
1489 Diff {
1490 base_version,
1491 line_ending,
1492 edits,
1493 }
1494 })
1495 }
1496
1497 /// Spawns a background task that searches the buffer for any whitespace
1498 /// at the ends of a lines, and returns a `Diff` that removes that whitespace.
1499 pub fn remove_trailing_whitespace(&self, cx: &AppContext) -> Task<Diff> {
1500 let old_text = self.as_rope().clone();
1501 let line_ending = self.line_ending();
1502 let base_version = self.version();
1503 cx.background_executor().spawn(async move {
1504 let ranges = trailing_whitespace_ranges(&old_text);
1505 let empty = Arc::<str>::from("");
1506 Diff {
1507 base_version,
1508 line_ending,
1509 edits: ranges
1510 .into_iter()
1511 .map(|range| (range, empty.clone()))
1512 .collect(),
1513 }
1514 })
1515 }
1516
1517 /// Ensures that the buffer ends with a single newline character, and
1518 /// no other whitespace.
1519 pub fn ensure_final_newline(&mut self, cx: &mut ModelContext<Self>) {
1520 let len = self.len();
1521 let mut offset = len;
1522 for chunk in self.as_rope().reversed_chunks_in_range(0..len) {
1523 let non_whitespace_len = chunk
1524 .trim_end_matches(|c: char| c.is_ascii_whitespace())
1525 .len();
1526 offset -= chunk.len();
1527 offset += non_whitespace_len;
1528 if non_whitespace_len != 0 {
1529 if offset == len - 1 && chunk.get(non_whitespace_len..) == Some("\n") {
1530 return;
1531 }
1532 break;
1533 }
1534 }
1535 self.edit([(offset..len, "\n")], None, cx);
1536 }
1537
1538 /// Applies a diff to the buffer. If the buffer has changed since the given diff was
1539 /// calculated, then adjust the diff to account for those changes, and discard any
1540 /// parts of the diff that conflict with those changes.
1541 pub fn apply_diff(&mut self, diff: Diff, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
1542 // Check for any edits to the buffer that have occurred since this diff
1543 // was computed.
1544 let snapshot = self.snapshot();
1545 let mut edits_since = snapshot.edits_since::<usize>(&diff.base_version).peekable();
1546 let mut delta = 0;
1547 let adjusted_edits = diff.edits.into_iter().filter_map(|(range, new_text)| {
1548 while let Some(edit_since) = edits_since.peek() {
1549 // If the edit occurs after a diff hunk, then it does not
1550 // affect that hunk.
1551 if edit_since.old.start > range.end {
1552 break;
1553 }
1554 // If the edit precedes the diff hunk, then adjust the hunk
1555 // to reflect the edit.
1556 else if edit_since.old.end < range.start {
1557 delta += edit_since.new_len() as i64 - edit_since.old_len() as i64;
1558 edits_since.next();
1559 }
1560 // If the edit intersects a diff hunk, then discard that hunk.
1561 else {
1562 return None;
1563 }
1564 }
1565
1566 let start = (range.start as i64 + delta) as usize;
1567 let end = (range.end as i64 + delta) as usize;
1568 Some((start..end, new_text))
1569 });
1570
1571 self.start_transaction();
1572 self.text.set_line_ending(diff.line_ending);
1573 self.edit(adjusted_edits, None, cx);
1574 self.end_transaction(cx)
1575 }
1576
1577 fn has_unsaved_edits(&self) -> bool {
1578 let (last_version, has_unsaved_edits) = self.has_unsaved_edits.take();
1579
1580 if last_version == self.version {
1581 self.has_unsaved_edits
1582 .set((last_version, has_unsaved_edits));
1583 return has_unsaved_edits;
1584 }
1585
1586 let has_edits = self.has_edits_since(&self.saved_version);
1587 self.has_unsaved_edits
1588 .set((self.version.clone(), has_edits));
1589 has_edits
1590 }
1591
1592 /// Checks if the buffer has unsaved changes.
1593 pub fn is_dirty(&self) -> bool {
1594 self.has_conflict
1595 || self.has_unsaved_edits()
1596 || self
1597 .file
1598 .as_ref()
1599 .map_or(false, |file| file.is_deleted() || !file.is_created())
1600 }
1601
1602 /// Checks if the buffer and its file have both changed since the buffer
1603 /// was last saved or reloaded.
1604 pub fn has_conflict(&self) -> bool {
1605 self.has_conflict
1606 || self.file.as_ref().map_or(false, |file| {
1607 file.mtime() > self.saved_mtime && self.has_unsaved_edits()
1608 })
1609 }
1610
1611 /// Gets a [`Subscription`] that tracks all of the changes to the buffer's text.
1612 pub fn subscribe(&mut self) -> Subscription {
1613 self.text.subscribe()
1614 }
1615
1616 /// Starts a transaction, if one is not already in-progress. When undoing or
1617 /// redoing edits, all of the edits performed within a transaction are undone
1618 /// or redone together.
1619 pub fn start_transaction(&mut self) -> Option<TransactionId> {
1620 self.start_transaction_at(Instant::now())
1621 }
1622
1623 /// Starts a transaction, providing the current time. Subsequent transactions
1624 /// that occur within a short period of time will be grouped together. This
1625 /// is controlled by the buffer's undo grouping duration.
1626 pub fn start_transaction_at(&mut self, now: Instant) -> Option<TransactionId> {
1627 self.transaction_depth += 1;
1628 if self.was_dirty_before_starting_transaction.is_none() {
1629 self.was_dirty_before_starting_transaction = Some(self.is_dirty());
1630 }
1631 self.text.start_transaction_at(now)
1632 }
1633
1634 /// Terminates the current transaction, if this is the outermost transaction.
1635 pub fn end_transaction(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
1636 self.end_transaction_at(Instant::now(), cx)
1637 }
1638
1639 /// Terminates the current transaction, providing the current time. Subsequent transactions
1640 /// that occur within a short period of time will be grouped together. This
1641 /// is controlled by the buffer's undo grouping duration.
1642 pub fn end_transaction_at(
1643 &mut self,
1644 now: Instant,
1645 cx: &mut ModelContext<Self>,
1646 ) -> Option<TransactionId> {
1647 assert!(self.transaction_depth > 0);
1648 self.transaction_depth -= 1;
1649 let was_dirty = if self.transaction_depth == 0 {
1650 self.was_dirty_before_starting_transaction.take().unwrap()
1651 } else {
1652 false
1653 };
1654 if let Some((transaction_id, start_version)) = self.text.end_transaction_at(now) {
1655 self.did_edit(&start_version, was_dirty, cx);
1656 Some(transaction_id)
1657 } else {
1658 None
1659 }
1660 }
1661
1662 /// Manually add a transaction to the buffer's undo history.
1663 pub fn push_transaction(&mut self, transaction: Transaction, now: Instant) {
1664 self.text.push_transaction(transaction, now);
1665 }
1666
1667 /// Prevent the last transaction from being grouped with any subsequent transactions,
1668 /// even if they occur with the buffer's undo grouping duration.
1669 pub fn finalize_last_transaction(&mut self) -> Option<&Transaction> {
1670 self.text.finalize_last_transaction()
1671 }
1672
1673 /// Manually group all changes since a given transaction.
1674 pub fn group_until_transaction(&mut self, transaction_id: TransactionId) {
1675 self.text.group_until_transaction(transaction_id);
1676 }
1677
1678 /// Manually remove a transaction from the buffer's undo history
1679 pub fn forget_transaction(&mut self, transaction_id: TransactionId) {
1680 self.text.forget_transaction(transaction_id);
1681 }
1682
1683 /// Manually merge two adjacent transactions in the buffer's undo history.
1684 pub fn merge_transactions(&mut self, transaction: TransactionId, destination: TransactionId) {
1685 self.text.merge_transactions(transaction, destination);
1686 }
1687
1688 /// Waits for the buffer to receive operations with the given timestamps.
1689 pub fn wait_for_edits(
1690 &mut self,
1691 edit_ids: impl IntoIterator<Item = clock::Lamport>,
1692 ) -> impl Future<Output = Result<()>> {
1693 self.text.wait_for_edits(edit_ids)
1694 }
1695
1696 /// Waits for the buffer to receive the operations necessary for resolving the given anchors.
1697 pub fn wait_for_anchors(
1698 &mut self,
1699 anchors: impl IntoIterator<Item = Anchor>,
1700 ) -> impl 'static + Future<Output = Result<()>> {
1701 self.text.wait_for_anchors(anchors)
1702 }
1703
1704 /// Waits for the buffer to receive operations up to the given version.
1705 pub fn wait_for_version(&mut self, version: clock::Global) -> impl Future<Output = Result<()>> {
1706 self.text.wait_for_version(version)
1707 }
1708
1709 /// Forces all futures returned by [`Buffer::wait_for_version`], [`Buffer::wait_for_edits`], or
1710 /// [`Buffer::wait_for_version`] to resolve with an error.
1711 pub fn give_up_waiting(&mut self) {
1712 self.text.give_up_waiting();
1713 }
1714
1715 /// Stores a set of selections that should be broadcasted to all of the buffer's replicas.
1716 pub fn set_active_selections(
1717 &mut self,
1718 selections: Arc<[Selection<Anchor>]>,
1719 line_mode: bool,
1720 cursor_shape: CursorShape,
1721 cx: &mut ModelContext<Self>,
1722 ) {
1723 let lamport_timestamp = self.text.lamport_clock.tick();
1724 self.remote_selections.insert(
1725 self.text.replica_id(),
1726 SelectionSet {
1727 selections: selections.clone(),
1728 lamport_timestamp,
1729 line_mode,
1730 cursor_shape,
1731 },
1732 );
1733 self.send_operation(
1734 Operation::UpdateSelections {
1735 selections,
1736 line_mode,
1737 lamport_timestamp,
1738 cursor_shape,
1739 },
1740 cx,
1741 );
1742 self.non_text_state_update_count += 1;
1743 cx.notify();
1744 }
1745
1746 /// Clears the selections, so that other replicas of the buffer do not see any selections for
1747 /// this replica.
1748 pub fn remove_active_selections(&mut self, cx: &mut ModelContext<Self>) {
1749 if self
1750 .remote_selections
1751 .get(&self.text.replica_id())
1752 .map_or(true, |set| !set.selections.is_empty())
1753 {
1754 self.set_active_selections(Arc::default(), false, Default::default(), cx);
1755 }
1756 }
1757
1758 /// Replaces the buffer's entire text.
1759 pub fn set_text<T>(&mut self, text: T, cx: &mut ModelContext<Self>) -> Option<clock::Lamport>
1760 where
1761 T: Into<Arc<str>>,
1762 {
1763 self.autoindent_requests.clear();
1764 self.edit([(0..self.len(), text)], None, cx)
1765 }
1766
1767 /// Applies the given edits to the buffer. Each edit is specified as a range of text to
1768 /// delete, and a string of text to insert at that location.
1769 ///
1770 /// If an [`AutoindentMode`] is provided, then the buffer will enqueue an auto-indent
1771 /// request for the edited ranges, which will be processed when the buffer finishes
1772 /// parsing.
1773 ///
1774 /// Parsing takes place at the end of a transaction, and may compute synchronously
1775 /// or asynchronously, depending on the changes.
1776 pub fn edit<I, S, T>(
1777 &mut self,
1778 edits_iter: I,
1779 autoindent_mode: Option<AutoindentMode>,
1780 cx: &mut ModelContext<Self>,
1781 ) -> Option<clock::Lamport>
1782 where
1783 I: IntoIterator<Item = (Range<S>, T)>,
1784 S: ToOffset,
1785 T: Into<Arc<str>>,
1786 {
1787 // Skip invalid edits and coalesce contiguous ones.
1788 let mut edits: Vec<(Range<usize>, Arc<str>)> = Vec::new();
1789 for (range, new_text) in edits_iter {
1790 let mut range = range.start.to_offset(self)..range.end.to_offset(self);
1791 if range.start > range.end {
1792 mem::swap(&mut range.start, &mut range.end);
1793 }
1794 let new_text = new_text.into();
1795 if !new_text.is_empty() || !range.is_empty() {
1796 if let Some((prev_range, prev_text)) = edits.last_mut() {
1797 if prev_range.end >= range.start {
1798 prev_range.end = cmp::max(prev_range.end, range.end);
1799 *prev_text = format!("{prev_text}{new_text}").into();
1800 } else {
1801 edits.push((range, new_text));
1802 }
1803 } else {
1804 edits.push((range, new_text));
1805 }
1806 }
1807 }
1808 if edits.is_empty() {
1809 return None;
1810 }
1811
1812 self.start_transaction();
1813 self.pending_autoindent.take();
1814 let autoindent_request = autoindent_mode
1815 .and_then(|mode| self.language.as_ref().map(|_| (self.snapshot(), mode)));
1816
1817 let edit_operation = self.text.edit(edits.iter().cloned());
1818 let edit_id = edit_operation.timestamp();
1819
1820 if let Some((before_edit, mode)) = autoindent_request {
1821 let mut delta = 0isize;
1822 let entries = edits
1823 .into_iter()
1824 .enumerate()
1825 .zip(&edit_operation.as_edit().unwrap().new_text)
1826 .map(|((ix, (range, _)), new_text)| {
1827 let new_text_length = new_text.len();
1828 let old_start = range.start.to_point(&before_edit);
1829 let new_start = (delta + range.start as isize) as usize;
1830 delta += new_text_length as isize - (range.end as isize - range.start as isize);
1831
1832 let mut range_of_insertion_to_indent = 0..new_text_length;
1833 let mut first_line_is_new = false;
1834 let mut original_indent_column = None;
1835
1836 // When inserting an entire line at the beginning of an existing line,
1837 // treat the insertion as new.
1838 if new_text.contains('\n')
1839 && old_start.column <= before_edit.indent_size_for_line(old_start.row).len
1840 {
1841 first_line_is_new = true;
1842 }
1843
1844 // When inserting text starting with a newline, avoid auto-indenting the
1845 // previous line.
1846 if new_text.starts_with('\n') {
1847 range_of_insertion_to_indent.start += 1;
1848 first_line_is_new = true;
1849 }
1850
1851 // Avoid auto-indenting after the insertion.
1852 if let AutoindentMode::Block {
1853 original_indent_columns,
1854 } = &mode
1855 {
1856 original_indent_column =
1857 Some(original_indent_columns.get(ix).copied().unwrap_or_else(|| {
1858 indent_size_for_text(
1859 new_text[range_of_insertion_to_indent.clone()].chars(),
1860 )
1861 .len
1862 }));
1863 if new_text[range_of_insertion_to_indent.clone()].ends_with('\n') {
1864 range_of_insertion_to_indent.end -= 1;
1865 }
1866 }
1867
1868 AutoindentRequestEntry {
1869 first_line_is_new,
1870 original_indent_column,
1871 indent_size: before_edit.language_indent_size_at(range.start, cx),
1872 range: self.anchor_before(new_start + range_of_insertion_to_indent.start)
1873 ..self.anchor_after(new_start + range_of_insertion_to_indent.end),
1874 }
1875 })
1876 .collect();
1877
1878 self.autoindent_requests.push(Arc::new(AutoindentRequest {
1879 before_edit,
1880 entries,
1881 is_block_mode: matches!(mode, AutoindentMode::Block { .. }),
1882 }));
1883 }
1884
1885 self.end_transaction(cx);
1886 self.send_operation(Operation::Buffer(edit_operation), cx);
1887 Some(edit_id)
1888 }
1889
1890 fn did_edit(
1891 &mut self,
1892 old_version: &clock::Global,
1893 was_dirty: bool,
1894 cx: &mut ModelContext<Self>,
1895 ) {
1896 if self.edits_since::<usize>(old_version).next().is_none() {
1897 return;
1898 }
1899
1900 self.reparse(cx);
1901
1902 cx.emit(Event::Edited);
1903 if was_dirty != self.is_dirty() {
1904 cx.emit(Event::DirtyChanged);
1905 }
1906 cx.notify();
1907 }
1908
1909 // Inserts newlines at the given position to create an empty line, returning the start of the new line.
1910 // You can also request the insertion of empty lines above and below the line starting at the returned point.
1911 pub fn insert_empty_line(
1912 &mut self,
1913 position: impl ToPoint,
1914 space_above: bool,
1915 space_below: bool,
1916 cx: &mut ModelContext<Self>,
1917 ) -> Point {
1918 let mut position = position.to_point(self);
1919
1920 self.start_transaction();
1921
1922 self.edit(
1923 [(position..position, "\n")],
1924 Some(AutoindentMode::EachLine),
1925 cx,
1926 );
1927
1928 if position.column > 0 {
1929 position += Point::new(1, 0);
1930 }
1931
1932 if !self.is_line_blank(position.row) {
1933 self.edit(
1934 [(position..position, "\n")],
1935 Some(AutoindentMode::EachLine),
1936 cx,
1937 );
1938 }
1939
1940 if space_above {
1941 if position.row > 0 && !self.is_line_blank(position.row - 1) {
1942 self.edit(
1943 [(position..position, "\n")],
1944 Some(AutoindentMode::EachLine),
1945 cx,
1946 );
1947 position.row += 1;
1948 }
1949 }
1950
1951 if space_below {
1952 if position.row == self.max_point().row || !self.is_line_blank(position.row + 1) {
1953 self.edit(
1954 [(position..position, "\n")],
1955 Some(AutoindentMode::EachLine),
1956 cx,
1957 );
1958 }
1959 }
1960
1961 self.end_transaction(cx);
1962
1963 position
1964 }
1965
1966 /// Applies the given remote operations to the buffer.
1967 pub fn apply_ops<I: IntoIterator<Item = Operation>>(
1968 &mut self,
1969 ops: I,
1970 cx: &mut ModelContext<Self>,
1971 ) -> Result<()> {
1972 self.pending_autoindent.take();
1973 let was_dirty = self.is_dirty();
1974 let old_version = self.version.clone();
1975 let mut deferred_ops = Vec::new();
1976 let buffer_ops = ops
1977 .into_iter()
1978 .filter_map(|op| match op {
1979 Operation::Buffer(op) => Some(op),
1980 _ => {
1981 if self.can_apply_op(&op) {
1982 self.apply_op(op, cx);
1983 } else {
1984 deferred_ops.push(op);
1985 }
1986 None
1987 }
1988 })
1989 .collect::<Vec<_>>();
1990 self.text.apply_ops(buffer_ops)?;
1991 self.deferred_ops.insert(deferred_ops);
1992 self.flush_deferred_ops(cx);
1993 self.did_edit(&old_version, was_dirty, cx);
1994 // Notify independently of whether the buffer was edited as the operations could include a
1995 // selection update.
1996 cx.notify();
1997 Ok(())
1998 }
1999
2000 fn flush_deferred_ops(&mut self, cx: &mut ModelContext<Self>) {
2001 let mut deferred_ops = Vec::new();
2002 for op in self.deferred_ops.drain().iter().cloned() {
2003 if self.can_apply_op(&op) {
2004 self.apply_op(op, cx);
2005 } else {
2006 deferred_ops.push(op);
2007 }
2008 }
2009 self.deferred_ops.insert(deferred_ops);
2010 }
2011
2012 pub fn has_deferred_ops(&self) -> bool {
2013 !self.deferred_ops.is_empty() || self.text.has_deferred_ops()
2014 }
2015
2016 fn can_apply_op(&self, operation: &Operation) -> bool {
2017 match operation {
2018 Operation::Buffer(_) => {
2019 unreachable!("buffer operations should never be applied at this layer")
2020 }
2021 Operation::UpdateDiagnostics {
2022 diagnostics: diagnostic_set,
2023 ..
2024 } => diagnostic_set.iter().all(|diagnostic| {
2025 self.text.can_resolve(&diagnostic.range.start)
2026 && self.text.can_resolve(&diagnostic.range.end)
2027 }),
2028 Operation::UpdateSelections { selections, .. } => selections
2029 .iter()
2030 .all(|s| self.can_resolve(&s.start) && self.can_resolve(&s.end)),
2031 Operation::UpdateCompletionTriggers { .. } => true,
2032 }
2033 }
2034
2035 fn apply_op(&mut self, operation: Operation, cx: &mut ModelContext<Self>) {
2036 match operation {
2037 Operation::Buffer(_) => {
2038 unreachable!("buffer operations should never be applied at this layer")
2039 }
2040 Operation::UpdateDiagnostics {
2041 server_id,
2042 diagnostics: diagnostic_set,
2043 lamport_timestamp,
2044 } => {
2045 let snapshot = self.snapshot();
2046 self.apply_diagnostic_update(
2047 server_id,
2048 DiagnosticSet::from_sorted_entries(diagnostic_set.iter().cloned(), &snapshot),
2049 lamport_timestamp,
2050 cx,
2051 );
2052 }
2053 Operation::UpdateSelections {
2054 selections,
2055 lamport_timestamp,
2056 line_mode,
2057 cursor_shape,
2058 } => {
2059 if let Some(set) = self.remote_selections.get(&lamport_timestamp.replica_id) {
2060 if set.lamport_timestamp > lamport_timestamp {
2061 return;
2062 }
2063 }
2064
2065 self.remote_selections.insert(
2066 lamport_timestamp.replica_id,
2067 SelectionSet {
2068 selections,
2069 lamport_timestamp,
2070 line_mode,
2071 cursor_shape,
2072 },
2073 );
2074 self.text.lamport_clock.observe(lamport_timestamp);
2075 self.non_text_state_update_count += 1;
2076 }
2077 Operation::UpdateCompletionTriggers {
2078 triggers,
2079 lamport_timestamp,
2080 } => {
2081 self.completion_triggers = triggers;
2082 self.text.lamport_clock.observe(lamport_timestamp);
2083 }
2084 }
2085 }
2086
2087 fn apply_diagnostic_update(
2088 &mut self,
2089 server_id: LanguageServerId,
2090 diagnostics: DiagnosticSet,
2091 lamport_timestamp: clock::Lamport,
2092 cx: &mut ModelContext<Self>,
2093 ) {
2094 if lamport_timestamp > self.diagnostics_timestamp {
2095 let ix = self.diagnostics.binary_search_by_key(&server_id, |e| e.0);
2096 if diagnostics.len() == 0 {
2097 if let Ok(ix) = ix {
2098 self.diagnostics.remove(ix);
2099 }
2100 } else {
2101 match ix {
2102 Err(ix) => self.diagnostics.insert(ix, (server_id, diagnostics)),
2103 Ok(ix) => self.diagnostics[ix].1 = diagnostics,
2104 };
2105 }
2106 self.diagnostics_timestamp = lamport_timestamp;
2107 self.non_text_state_update_count += 1;
2108 self.text.lamport_clock.observe(lamport_timestamp);
2109 cx.notify();
2110 cx.emit(Event::DiagnosticsUpdated);
2111 }
2112 }
2113
2114 fn send_operation(&mut self, operation: Operation, cx: &mut ModelContext<Self>) {
2115 cx.emit(Event::Operation(operation));
2116 }
2117
2118 /// Removes the selections for a given peer.
2119 pub fn remove_peer(&mut self, replica_id: ReplicaId, cx: &mut ModelContext<Self>) {
2120 self.remote_selections.remove(&replica_id);
2121 cx.notify();
2122 }
2123
2124 /// Undoes the most recent transaction.
2125 pub fn undo(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
2126 let was_dirty = self.is_dirty();
2127 let old_version = self.version.clone();
2128
2129 if let Some((transaction_id, operation)) = self.text.undo() {
2130 self.send_operation(Operation::Buffer(operation), cx);
2131 self.did_edit(&old_version, was_dirty, cx);
2132 Some(transaction_id)
2133 } else {
2134 None
2135 }
2136 }
2137
2138 /// Manually undoes a specific transaction in the buffer's undo history.
2139 pub fn undo_transaction(
2140 &mut self,
2141 transaction_id: TransactionId,
2142 cx: &mut ModelContext<Self>,
2143 ) -> bool {
2144 let was_dirty = self.is_dirty();
2145 let old_version = self.version.clone();
2146 if let Some(operation) = self.text.undo_transaction(transaction_id) {
2147 self.send_operation(Operation::Buffer(operation), cx);
2148 self.did_edit(&old_version, was_dirty, cx);
2149 true
2150 } else {
2151 false
2152 }
2153 }
2154
2155 /// Manually undoes all changes after a given transaction in the buffer's undo history.
2156 pub fn undo_to_transaction(
2157 &mut self,
2158 transaction_id: TransactionId,
2159 cx: &mut ModelContext<Self>,
2160 ) -> bool {
2161 let was_dirty = self.is_dirty();
2162 let old_version = self.version.clone();
2163
2164 let operations = self.text.undo_to_transaction(transaction_id);
2165 let undone = !operations.is_empty();
2166 for operation in operations {
2167 self.send_operation(Operation::Buffer(operation), cx);
2168 }
2169 if undone {
2170 self.did_edit(&old_version, was_dirty, cx)
2171 }
2172 undone
2173 }
2174
2175 /// Manually redoes a specific transaction in the buffer's redo history.
2176 pub fn redo(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
2177 let was_dirty = self.is_dirty();
2178 let old_version = self.version.clone();
2179
2180 if let Some((transaction_id, operation)) = self.text.redo() {
2181 self.send_operation(Operation::Buffer(operation), cx);
2182 self.did_edit(&old_version, was_dirty, cx);
2183 Some(transaction_id)
2184 } else {
2185 None
2186 }
2187 }
2188
2189 /// Manually undoes all changes until a given transaction in the buffer's redo history.
2190 pub fn redo_to_transaction(
2191 &mut self,
2192 transaction_id: TransactionId,
2193 cx: &mut ModelContext<Self>,
2194 ) -> bool {
2195 let was_dirty = self.is_dirty();
2196 let old_version = self.version.clone();
2197
2198 let operations = self.text.redo_to_transaction(transaction_id);
2199 let redone = !operations.is_empty();
2200 for operation in operations {
2201 self.send_operation(Operation::Buffer(operation), cx);
2202 }
2203 if redone {
2204 self.did_edit(&old_version, was_dirty, cx)
2205 }
2206 redone
2207 }
2208
2209 /// Override current completion triggers with the user-provided completion triggers.
2210 pub fn set_completion_triggers(&mut self, triggers: Vec<String>, cx: &mut ModelContext<Self>) {
2211 self.completion_triggers.clone_from(&triggers);
2212 self.completion_triggers_timestamp = self.text.lamport_clock.tick();
2213 self.send_operation(
2214 Operation::UpdateCompletionTriggers {
2215 triggers,
2216 lamport_timestamp: self.completion_triggers_timestamp,
2217 },
2218 cx,
2219 );
2220 cx.notify();
2221 }
2222
2223 /// Returns a list of strings which trigger a completion menu for this language.
2224 /// Usually this is driven by LSP server which returns a list of trigger characters for completions.
2225 pub fn completion_triggers(&self) -> &[String] {
2226 &self.completion_triggers
2227 }
2228
2229 /// Call this directly after performing edits to prevent the preview tab
2230 /// from being dismissed by those edits. It causes `should_dismiss_preview`
2231 /// to return false until there are additional edits.
2232 pub fn refresh_preview(&mut self) {
2233 self.preview_version = self.version.clone();
2234 }
2235
2236 /// Whether we should preserve the preview status of a tab containing this buffer.
2237 pub fn preserve_preview(&self) -> bool {
2238 !self.has_edits_since(&self.preview_version)
2239 }
2240}
2241
2242#[doc(hidden)]
2243#[cfg(any(test, feature = "test-support"))]
2244impl Buffer {
2245 pub fn edit_via_marked_text(
2246 &mut self,
2247 marked_string: &str,
2248 autoindent_mode: Option<AutoindentMode>,
2249 cx: &mut ModelContext<Self>,
2250 ) {
2251 let edits = self.edits_for_marked_text(marked_string);
2252 self.edit(edits, autoindent_mode, cx);
2253 }
2254
2255 pub fn set_group_interval(&mut self, group_interval: Duration) {
2256 self.text.set_group_interval(group_interval);
2257 }
2258
2259 pub fn randomly_edit<T>(
2260 &mut self,
2261 rng: &mut T,
2262 old_range_count: usize,
2263 cx: &mut ModelContext<Self>,
2264 ) where
2265 T: rand::Rng,
2266 {
2267 let mut edits: Vec<(Range<usize>, String)> = Vec::new();
2268 let mut last_end = None;
2269 for _ in 0..old_range_count {
2270 if last_end.map_or(false, |last_end| last_end >= self.len()) {
2271 break;
2272 }
2273
2274 let new_start = last_end.map_or(0, |last_end| last_end + 1);
2275 let mut range = self.random_byte_range(new_start, rng);
2276 if rng.gen_bool(0.2) {
2277 mem::swap(&mut range.start, &mut range.end);
2278 }
2279 last_end = Some(range.end);
2280
2281 let new_text_len = rng.gen_range(0..10);
2282 let new_text: String = RandomCharIter::new(&mut *rng).take(new_text_len).collect();
2283
2284 edits.push((range, new_text));
2285 }
2286 log::info!("mutating buffer {} with {:?}", self.replica_id(), edits);
2287 self.edit(edits, None, cx);
2288 }
2289
2290 pub fn randomly_undo_redo(&mut self, rng: &mut impl rand::Rng, cx: &mut ModelContext<Self>) {
2291 let was_dirty = self.is_dirty();
2292 let old_version = self.version.clone();
2293
2294 let ops = self.text.randomly_undo_redo(rng);
2295 if !ops.is_empty() {
2296 for op in ops {
2297 self.send_operation(Operation::Buffer(op), cx);
2298 self.did_edit(&old_version, was_dirty, cx);
2299 }
2300 }
2301 }
2302}
2303
2304impl EventEmitter<Event> for Buffer {}
2305
2306impl Deref for Buffer {
2307 type Target = TextBuffer;
2308
2309 fn deref(&self) -> &Self::Target {
2310 &self.text
2311 }
2312}
2313
2314impl BufferSnapshot {
2315 /// Returns [`IndentSize`] for a given line that respects user settings and /// language preferences.
2316 pub fn indent_size_for_line(&self, row: u32) -> IndentSize {
2317 indent_size_for_line(self, row)
2318 }
2319 /// Returns [`IndentSize`] for a given position that respects user settings
2320 /// and language preferences.
2321 pub fn language_indent_size_at<T: ToOffset>(&self, position: T, cx: &AppContext) -> IndentSize {
2322 let settings = language_settings(self.language_at(position), self.file(), cx);
2323 if settings.hard_tabs {
2324 IndentSize::tab()
2325 } else {
2326 IndentSize::spaces(settings.tab_size.get())
2327 }
2328 }
2329
2330 /// Retrieve the suggested indent size for all of the given rows. The unit of indentation
2331 /// is passed in as `single_indent_size`.
2332 pub fn suggested_indents(
2333 &self,
2334 rows: impl Iterator<Item = u32>,
2335 single_indent_size: IndentSize,
2336 ) -> BTreeMap<u32, IndentSize> {
2337 let mut result = BTreeMap::new();
2338
2339 for row_range in contiguous_ranges(rows, 10) {
2340 let suggestions = match self.suggest_autoindents(row_range.clone()) {
2341 Some(suggestions) => suggestions,
2342 _ => break,
2343 };
2344
2345 for (row, suggestion) in row_range.zip(suggestions) {
2346 let indent_size = if let Some(suggestion) = suggestion {
2347 result
2348 .get(&suggestion.basis_row)
2349 .copied()
2350 .unwrap_or_else(|| self.indent_size_for_line(suggestion.basis_row))
2351 .with_delta(suggestion.delta, single_indent_size)
2352 } else {
2353 self.indent_size_for_line(row)
2354 };
2355
2356 result.insert(row, indent_size);
2357 }
2358 }
2359
2360 result
2361 }
2362
2363 fn suggest_autoindents(
2364 &self,
2365 row_range: Range<u32>,
2366 ) -> Option<impl Iterator<Item = Option<IndentSuggestion>> + '_> {
2367 let config = &self.language.as_ref()?.config;
2368 let prev_non_blank_row = self.prev_non_blank_row(row_range.start);
2369
2370 // Find the suggested indentation ranges based on the syntax tree.
2371 let start = Point::new(prev_non_blank_row.unwrap_or(row_range.start), 0);
2372 let end = Point::new(row_range.end, 0);
2373 let range = (start..end).to_offset(&self.text);
2374 let mut matches = self.syntax.matches(range.clone(), &self.text, |grammar| {
2375 Some(&grammar.indents_config.as_ref()?.query)
2376 });
2377 let indent_configs = matches
2378 .grammars()
2379 .iter()
2380 .map(|grammar| grammar.indents_config.as_ref().unwrap())
2381 .collect::<Vec<_>>();
2382
2383 let mut indent_ranges = Vec::<Range<Point>>::new();
2384 let mut outdent_positions = Vec::<Point>::new();
2385 while let Some(mat) = matches.peek() {
2386 let mut start: Option<Point> = None;
2387 let mut end: Option<Point> = None;
2388
2389 let config = &indent_configs[mat.grammar_index];
2390 for capture in mat.captures {
2391 if capture.index == config.indent_capture_ix {
2392 start.get_or_insert(Point::from_ts_point(capture.node.start_position()));
2393 end.get_or_insert(Point::from_ts_point(capture.node.end_position()));
2394 } else if Some(capture.index) == config.start_capture_ix {
2395 start = Some(Point::from_ts_point(capture.node.end_position()));
2396 } else if Some(capture.index) == config.end_capture_ix {
2397 end = Some(Point::from_ts_point(capture.node.start_position()));
2398 } else if Some(capture.index) == config.outdent_capture_ix {
2399 outdent_positions.push(Point::from_ts_point(capture.node.start_position()));
2400 }
2401 }
2402
2403 matches.advance();
2404 if let Some((start, end)) = start.zip(end) {
2405 if start.row == end.row {
2406 continue;
2407 }
2408
2409 let range = start..end;
2410 match indent_ranges.binary_search_by_key(&range.start, |r| r.start) {
2411 Err(ix) => indent_ranges.insert(ix, range),
2412 Ok(ix) => {
2413 let prev_range = &mut indent_ranges[ix];
2414 prev_range.end = prev_range.end.max(range.end);
2415 }
2416 }
2417 }
2418 }
2419
2420 let mut error_ranges = Vec::<Range<Point>>::new();
2421 let mut matches = self.syntax.matches(range.clone(), &self.text, |grammar| {
2422 Some(&grammar.error_query)
2423 });
2424 while let Some(mat) = matches.peek() {
2425 let node = mat.captures[0].node;
2426 let start = Point::from_ts_point(node.start_position());
2427 let end = Point::from_ts_point(node.end_position());
2428 let range = start..end;
2429 let ix = match error_ranges.binary_search_by_key(&range.start, |r| r.start) {
2430 Ok(ix) | Err(ix) => ix,
2431 };
2432 let mut end_ix = ix;
2433 while let Some(existing_range) = error_ranges.get(end_ix) {
2434 if existing_range.end < end {
2435 end_ix += 1;
2436 } else {
2437 break;
2438 }
2439 }
2440 error_ranges.splice(ix..end_ix, [range]);
2441 matches.advance();
2442 }
2443
2444 outdent_positions.sort();
2445 for outdent_position in outdent_positions {
2446 // find the innermost indent range containing this outdent_position
2447 // set its end to the outdent position
2448 if let Some(range_to_truncate) = indent_ranges
2449 .iter_mut()
2450 .filter(|indent_range| indent_range.contains(&outdent_position))
2451 .last()
2452 {
2453 range_to_truncate.end = outdent_position;
2454 }
2455 }
2456
2457 // Find the suggested indentation increases and decreased based on regexes.
2458 let mut indent_change_rows = Vec::<(u32, Ordering)>::new();
2459 self.for_each_line(
2460 Point::new(prev_non_blank_row.unwrap_or(row_range.start), 0)
2461 ..Point::new(row_range.end, 0),
2462 |row, line| {
2463 if config
2464 .decrease_indent_pattern
2465 .as_ref()
2466 .map_or(false, |regex| regex.is_match(line))
2467 {
2468 indent_change_rows.push((row, Ordering::Less));
2469 }
2470 if config
2471 .increase_indent_pattern
2472 .as_ref()
2473 .map_or(false, |regex| regex.is_match(line))
2474 {
2475 indent_change_rows.push((row + 1, Ordering::Greater));
2476 }
2477 },
2478 );
2479
2480 let mut indent_changes = indent_change_rows.into_iter().peekable();
2481 let mut prev_row = if config.auto_indent_using_last_non_empty_line {
2482 prev_non_blank_row.unwrap_or(0)
2483 } else {
2484 row_range.start.saturating_sub(1)
2485 };
2486 let mut prev_row_start = Point::new(prev_row, self.indent_size_for_line(prev_row).len);
2487 Some(row_range.map(move |row| {
2488 let row_start = Point::new(row, self.indent_size_for_line(row).len);
2489
2490 let mut indent_from_prev_row = false;
2491 let mut outdent_from_prev_row = false;
2492 let mut outdent_to_row = u32::MAX;
2493
2494 while let Some((indent_row, delta)) = indent_changes.peek() {
2495 match indent_row.cmp(&row) {
2496 Ordering::Equal => match delta {
2497 Ordering::Less => outdent_from_prev_row = true,
2498 Ordering::Greater => indent_from_prev_row = true,
2499 _ => {}
2500 },
2501
2502 Ordering::Greater => break,
2503 Ordering::Less => {}
2504 }
2505
2506 indent_changes.next();
2507 }
2508
2509 for range in &indent_ranges {
2510 if range.start.row >= row {
2511 break;
2512 }
2513 if range.start.row == prev_row && range.end > row_start {
2514 indent_from_prev_row = true;
2515 }
2516 if range.end > prev_row_start && range.end <= row_start {
2517 outdent_to_row = outdent_to_row.min(range.start.row);
2518 }
2519 }
2520
2521 let within_error = error_ranges
2522 .iter()
2523 .any(|e| e.start.row < row && e.end > row_start);
2524
2525 let suggestion = if outdent_to_row == prev_row
2526 || (outdent_from_prev_row && indent_from_prev_row)
2527 {
2528 Some(IndentSuggestion {
2529 basis_row: prev_row,
2530 delta: Ordering::Equal,
2531 within_error,
2532 })
2533 } else if indent_from_prev_row {
2534 Some(IndentSuggestion {
2535 basis_row: prev_row,
2536 delta: Ordering::Greater,
2537 within_error,
2538 })
2539 } else if outdent_to_row < prev_row {
2540 Some(IndentSuggestion {
2541 basis_row: outdent_to_row,
2542 delta: Ordering::Equal,
2543 within_error,
2544 })
2545 } else if outdent_from_prev_row {
2546 Some(IndentSuggestion {
2547 basis_row: prev_row,
2548 delta: Ordering::Less,
2549 within_error,
2550 })
2551 } else if config.auto_indent_using_last_non_empty_line || !self.is_line_blank(prev_row)
2552 {
2553 Some(IndentSuggestion {
2554 basis_row: prev_row,
2555 delta: Ordering::Equal,
2556 within_error,
2557 })
2558 } else {
2559 None
2560 };
2561
2562 prev_row = row;
2563 prev_row_start = row_start;
2564 suggestion
2565 }))
2566 }
2567
2568 fn prev_non_blank_row(&self, mut row: u32) -> Option<u32> {
2569 while row > 0 {
2570 row -= 1;
2571 if !self.is_line_blank(row) {
2572 return Some(row);
2573 }
2574 }
2575 None
2576 }
2577
2578 fn get_highlights(&self, range: Range<usize>) -> (SyntaxMapCaptures, Vec<HighlightMap>) {
2579 let captures = self.syntax.captures(range, &self.text, |grammar| {
2580 grammar.highlights_query.as_ref()
2581 });
2582 let highlight_maps = captures
2583 .grammars()
2584 .into_iter()
2585 .map(|grammar| grammar.highlight_map())
2586 .collect();
2587 (captures, highlight_maps)
2588 }
2589 /// Iterates over chunks of text in the given range of the buffer. Text is chunked
2590 /// in an arbitrary way due to being stored in a [`Rope`](text::Rope). The text is also
2591 /// returned in chunks where each chunk has a single syntax highlighting style and
2592 /// diagnostic status.
2593 pub fn chunks<T: ToOffset>(&self, range: Range<T>, language_aware: bool) -> BufferChunks {
2594 let range = range.start.to_offset(self)..range.end.to_offset(self);
2595
2596 let mut syntax = None;
2597 if language_aware {
2598 syntax = Some(self.get_highlights(range.clone()));
2599 }
2600 // We want to look at diagnostic spans only when iterating over language-annotated chunks.
2601 let diagnostics = language_aware;
2602 BufferChunks::new(self.text.as_rope(), range, syntax, diagnostics, Some(self))
2603 }
2604
2605 /// Invokes the given callback for each line of text in the given range of the buffer.
2606 /// Uses callback to avoid allocating a string for each line.
2607 fn for_each_line(&self, range: Range<Point>, mut callback: impl FnMut(u32, &str)) {
2608 let mut line = String::new();
2609 let mut row = range.start.row;
2610 for chunk in self
2611 .as_rope()
2612 .chunks_in_range(range.to_offset(self))
2613 .chain(["\n"])
2614 {
2615 for (newline_ix, text) in chunk.split('\n').enumerate() {
2616 if newline_ix > 0 {
2617 callback(row, &line);
2618 row += 1;
2619 line.clear();
2620 }
2621 line.push_str(text);
2622 }
2623 }
2624 }
2625
2626 /// Iterates over every [`SyntaxLayer`] in the buffer.
2627 pub fn syntax_layers(&self) -> impl Iterator<Item = SyntaxLayer> + '_ {
2628 self.syntax.layers_for_range(0..self.len(), &self.text)
2629 }
2630
2631 pub fn syntax_layer_at<D: ToOffset>(&self, position: D) -> Option<SyntaxLayer> {
2632 let offset = position.to_offset(self);
2633 self.syntax
2634 .layers_for_range(offset..offset, &self.text)
2635 .filter(|l| l.node().end_byte() > offset)
2636 .last()
2637 }
2638
2639 /// Returns the main [Language]
2640 pub fn language(&self) -> Option<&Arc<Language>> {
2641 self.language.as_ref()
2642 }
2643
2644 /// Returns the [Language] at the given location.
2645 pub fn language_at<D: ToOffset>(&self, position: D) -> Option<&Arc<Language>> {
2646 self.syntax_layer_at(position)
2647 .map(|info| info.language)
2648 .or(self.language.as_ref())
2649 }
2650
2651 /// Returns the settings for the language at the given location.
2652 pub fn settings_at<'a, D: ToOffset>(
2653 &self,
2654 position: D,
2655 cx: &'a AppContext,
2656 ) -> &'a LanguageSettings {
2657 language_settings(self.language_at(position), self.file.as_ref(), cx)
2658 }
2659
2660 /// Returns the [LanguageScope] at the given location.
2661 pub fn language_scope_at<D: ToOffset>(&self, position: D) -> Option<LanguageScope> {
2662 let offset = position.to_offset(self);
2663 let mut scope = None;
2664 let mut smallest_range: Option<Range<usize>> = None;
2665
2666 // Use the layer that has the smallest node intersecting the given point.
2667 for layer in self.syntax.layers_for_range(offset..offset, &self.text) {
2668 let mut cursor = layer.node().walk();
2669
2670 let mut range = None;
2671 loop {
2672 let child_range = cursor.node().byte_range();
2673 if !child_range.to_inclusive().contains(&offset) {
2674 break;
2675 }
2676
2677 range = Some(child_range);
2678 if cursor.goto_first_child_for_byte(offset).is_none() {
2679 break;
2680 }
2681 }
2682
2683 if let Some(range) = range {
2684 if smallest_range
2685 .as_ref()
2686 .map_or(true, |smallest_range| range.len() < smallest_range.len())
2687 {
2688 smallest_range = Some(range);
2689 scope = Some(LanguageScope {
2690 language: layer.language.clone(),
2691 override_id: layer.override_id(offset, &self.text),
2692 });
2693 }
2694 }
2695 }
2696
2697 scope.or_else(|| {
2698 self.language.clone().map(|language| LanguageScope {
2699 language,
2700 override_id: None,
2701 })
2702 })
2703 }
2704
2705 /// Returns a tuple of the range and character kind of the word
2706 /// surrounding the given position.
2707 pub fn surrounding_word<T: ToOffset>(&self, start: T) -> (Range<usize>, Option<CharKind>) {
2708 let mut start = start.to_offset(self);
2709 let mut end = start;
2710 let mut next_chars = self.chars_at(start).peekable();
2711 let mut prev_chars = self.reversed_chars_at(start).peekable();
2712
2713 let scope = self.language_scope_at(start);
2714 let kind = |c| char_kind(&scope, c);
2715 let word_kind = cmp::max(
2716 prev_chars.peek().copied().map(kind),
2717 next_chars.peek().copied().map(kind),
2718 );
2719
2720 for ch in prev_chars {
2721 if Some(kind(ch)) == word_kind && ch != '\n' {
2722 start -= ch.len_utf8();
2723 } else {
2724 break;
2725 }
2726 }
2727
2728 for ch in next_chars {
2729 if Some(kind(ch)) == word_kind && ch != '\n' {
2730 end += ch.len_utf8();
2731 } else {
2732 break;
2733 }
2734 }
2735
2736 (start..end, word_kind)
2737 }
2738
2739 /// Returns the range for the closes syntax node enclosing the given range.
2740 pub fn range_for_syntax_ancestor<T: ToOffset>(&self, range: Range<T>) -> Option<Range<usize>> {
2741 let range = range.start.to_offset(self)..range.end.to_offset(self);
2742 let mut result: Option<Range<usize>> = None;
2743 'outer: for layer in self.syntax.layers_for_range(range.clone(), &self.text) {
2744 let mut cursor = layer.node().walk();
2745
2746 // Descend to the first leaf that touches the start of the range,
2747 // and if the range is non-empty, extends beyond the start.
2748 while cursor.goto_first_child_for_byte(range.start).is_some() {
2749 if !range.is_empty() && cursor.node().end_byte() == range.start {
2750 cursor.goto_next_sibling();
2751 }
2752 }
2753
2754 // Ascend to the smallest ancestor that strictly contains the range.
2755 loop {
2756 let node_range = cursor.node().byte_range();
2757 if node_range.start <= range.start
2758 && node_range.end >= range.end
2759 && node_range.len() > range.len()
2760 {
2761 break;
2762 }
2763 if !cursor.goto_parent() {
2764 continue 'outer;
2765 }
2766 }
2767
2768 let left_node = cursor.node();
2769 let mut layer_result = left_node.byte_range();
2770
2771 // For an empty range, try to find another node immediately to the right of the range.
2772 if left_node.end_byte() == range.start {
2773 let mut right_node = None;
2774 while !cursor.goto_next_sibling() {
2775 if !cursor.goto_parent() {
2776 break;
2777 }
2778 }
2779
2780 while cursor.node().start_byte() == range.start {
2781 right_node = Some(cursor.node());
2782 if !cursor.goto_first_child() {
2783 break;
2784 }
2785 }
2786
2787 // If there is a candidate node on both sides of the (empty) range, then
2788 // decide between the two by favoring a named node over an anonymous token.
2789 // If both nodes are the same in that regard, favor the right one.
2790 if let Some(right_node) = right_node {
2791 if right_node.is_named() || !left_node.is_named() {
2792 layer_result = right_node.byte_range();
2793 }
2794 }
2795 }
2796
2797 if let Some(previous_result) = &result {
2798 if previous_result.len() < layer_result.len() {
2799 continue;
2800 }
2801 }
2802 result = Some(layer_result);
2803 }
2804
2805 result
2806 }
2807
2808 /// Returns the outline for the buffer.
2809 ///
2810 /// This method allows passing an optional [SyntaxTheme] to
2811 /// syntax-highlight the returned symbols.
2812 pub fn outline(&self, theme: Option<&SyntaxTheme>) -> Option<Outline<Anchor>> {
2813 self.outline_items_containing(0..self.len(), true, theme)
2814 .map(Outline::new)
2815 }
2816
2817 /// Returns all the symbols that contain the given position.
2818 ///
2819 /// This method allows passing an optional [SyntaxTheme] to
2820 /// syntax-highlight the returned symbols.
2821 pub fn symbols_containing<T: ToOffset>(
2822 &self,
2823 position: T,
2824 theme: Option<&SyntaxTheme>,
2825 ) -> Option<Vec<OutlineItem<Anchor>>> {
2826 let position = position.to_offset(self);
2827 let mut items = self.outline_items_containing(
2828 position.saturating_sub(1)..self.len().min(position + 1),
2829 false,
2830 theme,
2831 )?;
2832 let mut prev_depth = None;
2833 items.retain(|item| {
2834 let result = prev_depth.map_or(true, |prev_depth| item.depth > prev_depth);
2835 prev_depth = Some(item.depth);
2836 result
2837 });
2838 Some(items)
2839 }
2840
2841 pub fn outline_items_containing<T: ToOffset>(
2842 &self,
2843 range: Range<T>,
2844 include_extra_context: bool,
2845 theme: Option<&SyntaxTheme>,
2846 ) -> Option<Vec<OutlineItem<Anchor>>> {
2847 let range = range.to_offset(self);
2848 let mut matches = self.syntax.matches(range.clone(), &self.text, |grammar| {
2849 grammar.outline_config.as_ref().map(|c| &c.query)
2850 });
2851 let configs = matches
2852 .grammars()
2853 .iter()
2854 .map(|g| g.outline_config.as_ref().unwrap())
2855 .collect::<Vec<_>>();
2856
2857 let mut items = Vec::new();
2858 let mut annotation_row_ranges: Vec<Range<u32>> = Vec::new();
2859 while let Some(mat) = matches.peek() {
2860 let config = &configs[mat.grammar_index];
2861 if let Some(item) =
2862 self.next_outline_item(config, &mat, &range, include_extra_context, theme)
2863 {
2864 items.push(item);
2865 } else if let Some(capture) = mat
2866 .captures
2867 .iter()
2868 .find(|capture| Some(capture.index) == config.annotation_capture_ix)
2869 {
2870 let capture_range = capture.node.start_position()..capture.node.end_position();
2871 let mut capture_row_range =
2872 capture_range.start.row as u32..capture_range.end.row as u32;
2873 if capture_range.end.row > capture_range.start.row && capture_range.end.column == 0
2874 {
2875 capture_row_range.end -= 1;
2876 }
2877 if let Some(last_row_range) = annotation_row_ranges.last_mut() {
2878 if last_row_range.end >= capture_row_range.start.saturating_sub(1) {
2879 last_row_range.end = capture_row_range.end;
2880 } else {
2881 annotation_row_ranges.push(capture_row_range);
2882 }
2883 } else {
2884 annotation_row_ranges.push(capture_row_range);
2885 }
2886 }
2887 matches.advance();
2888 }
2889
2890 items.sort_by_key(|item| (item.range.start, Reverse(item.range.end)));
2891
2892 // Assign depths based on containment relationships and convert to anchors.
2893 let mut item_ends_stack = Vec::<Point>::new();
2894 let mut anchor_items = Vec::new();
2895 let mut annotation_row_ranges = annotation_row_ranges.into_iter().peekable();
2896 for item in items {
2897 while let Some(last_end) = item_ends_stack.last().copied() {
2898 if last_end < item.range.end {
2899 item_ends_stack.pop();
2900 } else {
2901 break;
2902 }
2903 }
2904
2905 let mut annotation_row_range = None;
2906 while let Some(next_annotation_row_range) = annotation_row_ranges.peek() {
2907 let row_preceding_item = item.range.start.row.saturating_sub(1);
2908 if next_annotation_row_range.end < row_preceding_item {
2909 annotation_row_ranges.next();
2910 } else {
2911 if next_annotation_row_range.end == row_preceding_item {
2912 annotation_row_range = Some(next_annotation_row_range.clone());
2913 annotation_row_ranges.next();
2914 }
2915 break;
2916 }
2917 }
2918
2919 anchor_items.push(OutlineItem {
2920 depth: item_ends_stack.len(),
2921 range: self.anchor_after(item.range.start)..self.anchor_before(item.range.end),
2922 text: item.text,
2923 highlight_ranges: item.highlight_ranges,
2924 name_ranges: item.name_ranges,
2925 body_range: item.body_range.map(|body_range| {
2926 self.anchor_after(body_range.start)..self.anchor_before(body_range.end)
2927 }),
2928 annotation_range: annotation_row_range.map(|annotation_range| {
2929 self.anchor_after(Point::new(annotation_range.start, 0))
2930 ..self.anchor_before(Point::new(
2931 annotation_range.end,
2932 self.line_len(annotation_range.end),
2933 ))
2934 }),
2935 });
2936 item_ends_stack.push(item.range.end);
2937 }
2938
2939 Some(anchor_items)
2940 }
2941
2942 fn next_outline_item(
2943 &self,
2944 config: &OutlineConfig,
2945 mat: &SyntaxMapMatch,
2946 range: &Range<usize>,
2947 include_extra_context: bool,
2948 theme: Option<&SyntaxTheme>,
2949 ) -> Option<OutlineItem<Point>> {
2950 let item_node = mat.captures.iter().find_map(|cap| {
2951 if cap.index == config.item_capture_ix {
2952 Some(cap.node)
2953 } else {
2954 None
2955 }
2956 })?;
2957
2958 let item_byte_range = item_node.byte_range();
2959 if item_byte_range.end < range.start || item_byte_range.start > range.end {
2960 return None;
2961 }
2962 let item_point_range = Point::from_ts_point(item_node.start_position())
2963 ..Point::from_ts_point(item_node.end_position());
2964
2965 let mut open_point = None;
2966 let mut close_point = None;
2967 let mut buffer_ranges = Vec::new();
2968 for capture in mat.captures {
2969 let node_is_name;
2970 if capture.index == config.name_capture_ix {
2971 node_is_name = true;
2972 } else if Some(capture.index) == config.context_capture_ix
2973 || (Some(capture.index) == config.extra_context_capture_ix && include_extra_context)
2974 {
2975 node_is_name = false;
2976 } else {
2977 if Some(capture.index) == config.open_capture_ix {
2978 open_point = Some(Point::from_ts_point(capture.node.end_position()));
2979 } else if Some(capture.index) == config.close_capture_ix {
2980 close_point = Some(Point::from_ts_point(capture.node.start_position()));
2981 }
2982
2983 continue;
2984 }
2985
2986 let mut range = capture.node.start_byte()..capture.node.end_byte();
2987 let start = capture.node.start_position();
2988 if capture.node.end_position().row > start.row {
2989 range.end = range.start + self.line_len(start.row as u32) as usize - start.column;
2990 }
2991
2992 if !range.is_empty() {
2993 buffer_ranges.push((range, node_is_name));
2994 }
2995 }
2996 if buffer_ranges.is_empty() {
2997 return None;
2998 }
2999 let mut text = String::new();
3000 let mut highlight_ranges = Vec::new();
3001 let mut name_ranges = Vec::new();
3002 let mut chunks = self.chunks(
3003 buffer_ranges.first().unwrap().0.start..buffer_ranges.last().unwrap().0.end,
3004 true,
3005 );
3006 let mut last_buffer_range_end = 0;
3007 for (buffer_range, is_name) in buffer_ranges {
3008 if !text.is_empty() && buffer_range.start > last_buffer_range_end {
3009 text.push(' ');
3010 }
3011 last_buffer_range_end = buffer_range.end;
3012 if is_name {
3013 let mut start = text.len();
3014 let end = start + buffer_range.len();
3015
3016 // When multiple names are captured, then the matcheable text
3017 // includes the whitespace in between the names.
3018 if !name_ranges.is_empty() {
3019 start -= 1;
3020 }
3021
3022 name_ranges.push(start..end);
3023 }
3024
3025 let mut offset = buffer_range.start;
3026 chunks.seek(buffer_range.clone());
3027 for mut chunk in chunks.by_ref() {
3028 if chunk.text.len() > buffer_range.end - offset {
3029 chunk.text = &chunk.text[0..(buffer_range.end - offset)];
3030 offset = buffer_range.end;
3031 } else {
3032 offset += chunk.text.len();
3033 }
3034 let style = chunk
3035 .syntax_highlight_id
3036 .zip(theme)
3037 .and_then(|(highlight, theme)| highlight.style(theme));
3038 if let Some(style) = style {
3039 let start = text.len();
3040 let end = start + chunk.text.len();
3041 highlight_ranges.push((start..end, style));
3042 }
3043 text.push_str(chunk.text);
3044 if offset >= buffer_range.end {
3045 break;
3046 }
3047 }
3048 }
3049
3050 Some(OutlineItem {
3051 depth: 0, // We'll calculate the depth later
3052 range: item_point_range,
3053 text,
3054 highlight_ranges,
3055 name_ranges,
3056 body_range: open_point.zip(close_point).map(|(start, end)| start..end),
3057 annotation_range: None,
3058 })
3059 }
3060
3061 /// For each grammar in the language, runs the provided
3062 /// [tree_sitter::Query] against the given range.
3063 pub fn matches(
3064 &self,
3065 range: Range<usize>,
3066 query: fn(&Grammar) -> Option<&tree_sitter::Query>,
3067 ) -> SyntaxMapMatches {
3068 self.syntax.matches(range, self, query)
3069 }
3070
3071 /// Returns bracket range pairs overlapping or adjacent to `range`
3072 pub fn bracket_ranges<T: ToOffset>(
3073 &self,
3074 range: Range<T>,
3075 ) -> impl Iterator<Item = (Range<usize>, Range<usize>)> + '_ {
3076 // Find bracket pairs that *inclusively* contain the given range.
3077 let range = range.start.to_offset(self).saturating_sub(1)
3078 ..self.len().min(range.end.to_offset(self) + 1);
3079
3080 let mut matches = self.syntax.matches(range.clone(), &self.text, |grammar| {
3081 grammar.brackets_config.as_ref().map(|c| &c.query)
3082 });
3083 let configs = matches
3084 .grammars()
3085 .iter()
3086 .map(|grammar| grammar.brackets_config.as_ref().unwrap())
3087 .collect::<Vec<_>>();
3088
3089 iter::from_fn(move || {
3090 while let Some(mat) = matches.peek() {
3091 let mut open = None;
3092 let mut close = None;
3093 let config = &configs[mat.grammar_index];
3094 for capture in mat.captures {
3095 if capture.index == config.open_capture_ix {
3096 open = Some(capture.node.byte_range());
3097 } else if capture.index == config.close_capture_ix {
3098 close = Some(capture.node.byte_range());
3099 }
3100 }
3101
3102 matches.advance();
3103
3104 let Some((open, close)) = open.zip(close) else {
3105 continue;
3106 };
3107
3108 let bracket_range = open.start..=close.end;
3109 if !bracket_range.overlaps(&range) {
3110 continue;
3111 }
3112
3113 return Some((open, close));
3114 }
3115 None
3116 })
3117 }
3118
3119 /// Returns enclosing bracket ranges containing the given range
3120 pub fn enclosing_bracket_ranges<T: ToOffset>(
3121 &self,
3122 range: Range<T>,
3123 ) -> impl Iterator<Item = (Range<usize>, Range<usize>)> + '_ {
3124 let range = range.start.to_offset(self)..range.end.to_offset(self);
3125
3126 self.bracket_ranges(range.clone())
3127 .filter(move |(open, close)| open.start <= range.start && close.end >= range.end)
3128 }
3129
3130 /// Returns the smallest enclosing bracket ranges containing the given range or None if no brackets contain range
3131 ///
3132 /// Can optionally pass a range_filter to filter the ranges of brackets to consider
3133 pub fn innermost_enclosing_bracket_ranges<T: ToOffset>(
3134 &self,
3135 range: Range<T>,
3136 range_filter: Option<&dyn Fn(Range<usize>, Range<usize>) -> bool>,
3137 ) -> Option<(Range<usize>, Range<usize>)> {
3138 let range = range.start.to_offset(self)..range.end.to_offset(self);
3139
3140 // Get the ranges of the innermost pair of brackets.
3141 let mut result: Option<(Range<usize>, Range<usize>)> = None;
3142
3143 for (open, close) in self.enclosing_bracket_ranges(range.clone()) {
3144 if let Some(range_filter) = range_filter {
3145 if !range_filter(open.clone(), close.clone()) {
3146 continue;
3147 }
3148 }
3149
3150 let len = close.end - open.start;
3151
3152 if let Some((existing_open, existing_close)) = &result {
3153 let existing_len = existing_close.end - existing_open.start;
3154 if len > existing_len {
3155 continue;
3156 }
3157 }
3158
3159 result = Some((open, close));
3160 }
3161
3162 result
3163 }
3164
3165 /// Returns anchor ranges for any matches of the redaction query.
3166 /// The buffer can be associated with multiple languages, and the redaction query associated with each
3167 /// will be run on the relevant section of the buffer.
3168 pub fn redacted_ranges<T: ToOffset>(
3169 &self,
3170 range: Range<T>,
3171 ) -> impl Iterator<Item = Range<usize>> + '_ {
3172 let offset_range = range.start.to_offset(self)..range.end.to_offset(self);
3173 let mut syntax_matches = self.syntax.matches(offset_range, self, |grammar| {
3174 grammar
3175 .redactions_config
3176 .as_ref()
3177 .map(|config| &config.query)
3178 });
3179
3180 let configs = syntax_matches
3181 .grammars()
3182 .iter()
3183 .map(|grammar| grammar.redactions_config.as_ref())
3184 .collect::<Vec<_>>();
3185
3186 iter::from_fn(move || {
3187 let redacted_range = syntax_matches
3188 .peek()
3189 .and_then(|mat| {
3190 configs[mat.grammar_index].and_then(|config| {
3191 mat.captures
3192 .iter()
3193 .find(|capture| capture.index == config.redaction_capture_ix)
3194 })
3195 })
3196 .map(|mat| mat.node.byte_range());
3197 syntax_matches.advance();
3198 redacted_range
3199 })
3200 }
3201
3202 pub fn injections_intersecting_range<T: ToOffset>(
3203 &self,
3204 range: Range<T>,
3205 ) -> impl Iterator<Item = (Range<usize>, &Arc<Language>)> + '_ {
3206 let offset_range = range.start.to_offset(self)..range.end.to_offset(self);
3207
3208 let mut syntax_matches = self.syntax.matches(offset_range, self, |grammar| {
3209 grammar
3210 .injection_config
3211 .as_ref()
3212 .map(|config| &config.query)
3213 });
3214
3215 let configs = syntax_matches
3216 .grammars()
3217 .iter()
3218 .map(|grammar| grammar.injection_config.as_ref())
3219 .collect::<Vec<_>>();
3220
3221 iter::from_fn(move || {
3222 let ranges = syntax_matches.peek().and_then(|mat| {
3223 let config = &configs[mat.grammar_index]?;
3224 let content_capture_range = mat.captures.iter().find_map(|capture| {
3225 if capture.index == config.content_capture_ix {
3226 Some(capture.node.byte_range())
3227 } else {
3228 None
3229 }
3230 })?;
3231 let language = self.language_at(content_capture_range.start)?;
3232 Some((content_capture_range, language))
3233 });
3234 syntax_matches.advance();
3235 ranges
3236 })
3237 }
3238
3239 pub fn runnable_ranges(
3240 &self,
3241 range: Range<Anchor>,
3242 ) -> impl Iterator<Item = RunnableRange> + '_ {
3243 let offset_range = range.start.to_offset(self)..range.end.to_offset(self);
3244
3245 let mut syntax_matches = self.syntax.matches(offset_range, self, |grammar| {
3246 grammar.runnable_config.as_ref().map(|config| &config.query)
3247 });
3248
3249 let test_configs = syntax_matches
3250 .grammars()
3251 .iter()
3252 .map(|grammar| grammar.runnable_config.as_ref())
3253 .collect::<Vec<_>>();
3254
3255 iter::from_fn(move || loop {
3256 let mat = syntax_matches.peek()?;
3257
3258 let test_range = test_configs[mat.grammar_index].and_then(|test_configs| {
3259 let mut run_range = None;
3260 let full_range = mat.captures.iter().fold(
3261 Range {
3262 start: usize::MAX,
3263 end: 0,
3264 },
3265 |mut acc, next| {
3266 let byte_range = next.node.byte_range();
3267 if acc.start > byte_range.start {
3268 acc.start = byte_range.start;
3269 }
3270 if acc.end < byte_range.end {
3271 acc.end = byte_range.end;
3272 }
3273 acc
3274 },
3275 );
3276 if full_range.start > full_range.end {
3277 // We did not find a full spanning range of this match.
3278 return None;
3279 }
3280 let extra_captures: SmallVec<[_; 1]> =
3281 SmallVec::from_iter(mat.captures.iter().filter_map(|capture| {
3282 test_configs
3283 .extra_captures
3284 .get(capture.index as usize)
3285 .cloned()
3286 .and_then(|tag_name| match tag_name {
3287 RunnableCapture::Named(name) => {
3288 Some((capture.node.byte_range(), name))
3289 }
3290 RunnableCapture::Run => {
3291 let _ = run_range.insert(capture.node.byte_range());
3292 None
3293 }
3294 })
3295 }));
3296 let run_range = run_range?;
3297 let tags = test_configs
3298 .query
3299 .property_settings(mat.pattern_index)
3300 .iter()
3301 .filter_map(|property| {
3302 if *property.key == *"tag" {
3303 property
3304 .value
3305 .as_ref()
3306 .map(|value| RunnableTag(value.to_string().into()))
3307 } else {
3308 None
3309 }
3310 })
3311 .collect();
3312 let extra_captures = extra_captures
3313 .into_iter()
3314 .map(|(range, name)| {
3315 (
3316 name.to_string(),
3317 self.text_for_range(range.clone()).collect::<String>(),
3318 )
3319 })
3320 .collect();
3321 // All tags should have the same range.
3322 Some(RunnableRange {
3323 run_range,
3324 full_range,
3325 runnable: Runnable {
3326 tags,
3327 language: mat.language,
3328 buffer: self.remote_id(),
3329 },
3330 extra_captures,
3331 buffer_id: self.remote_id(),
3332 })
3333 });
3334
3335 syntax_matches.advance();
3336 if test_range.is_some() {
3337 // It's fine for us to short-circuit on .peek()? returning None. We don't want to return None from this iter if we
3338 // had a capture that did not contain a run marker, hence we'll just loop around for the next capture.
3339 return test_range;
3340 }
3341 })
3342 }
3343
3344 pub fn indent_guides_in_range(
3345 &self,
3346 range: Range<Anchor>,
3347 ignore_disabled_for_language: bool,
3348 cx: &AppContext,
3349 ) -> Vec<IndentGuide> {
3350 let language_settings = language_settings(self.language(), self.file.as_ref(), cx);
3351 let settings = language_settings.indent_guides;
3352 if !ignore_disabled_for_language && !settings.enabled {
3353 return Vec::new();
3354 }
3355 let tab_size = language_settings.tab_size.get() as u32;
3356
3357 let start_row = range.start.to_point(self).row;
3358 let end_row = range.end.to_point(self).row;
3359 let row_range = start_row..end_row + 1;
3360
3361 let mut row_indents = self.line_indents_in_row_range(row_range.clone());
3362
3363 let mut result_vec = Vec::new();
3364 let mut indent_stack = SmallVec::<[IndentGuide; 8]>::new();
3365
3366 while let Some((first_row, mut line_indent)) = row_indents.next() {
3367 let current_depth = indent_stack.len() as u32;
3368
3369 // When encountering empty, continue until found useful line indent
3370 // then add to the indent stack with the depth found
3371 let mut found_indent = false;
3372 let mut last_row = first_row;
3373 if line_indent.is_line_empty() {
3374 let mut trailing_row = end_row;
3375 while !found_indent {
3376 let (target_row, new_line_indent) =
3377 if let Some(display_row) = row_indents.next() {
3378 display_row
3379 } else {
3380 // This means we reached the end of the given range and found empty lines at the end.
3381 // We need to traverse further until we find a non-empty line to know if we need to add
3382 // an indent guide for the last visible indent.
3383 trailing_row += 1;
3384
3385 const TRAILING_ROW_SEARCH_LIMIT: u32 = 25;
3386 if trailing_row > self.max_point().row
3387 || trailing_row > end_row + TRAILING_ROW_SEARCH_LIMIT
3388 {
3389 break;
3390 }
3391 let new_line_indent = self.line_indent_for_row(trailing_row);
3392 (trailing_row, new_line_indent)
3393 };
3394
3395 if new_line_indent.is_line_empty() {
3396 continue;
3397 }
3398 last_row = target_row.min(end_row);
3399 line_indent = new_line_indent;
3400 found_indent = true;
3401 break;
3402 }
3403 } else {
3404 found_indent = true
3405 }
3406
3407 let depth = if found_indent {
3408 line_indent.len(tab_size) / tab_size
3409 + ((line_indent.len(tab_size) % tab_size) > 0) as u32
3410 } else {
3411 current_depth
3412 };
3413
3414 if depth < current_depth {
3415 for _ in 0..(current_depth - depth) {
3416 let mut indent = indent_stack.pop().unwrap();
3417 if last_row != first_row {
3418 // In this case, we landed on an empty row, had to seek forward,
3419 // and discovered that the indent we where on is ending.
3420 // This means that the last display row must
3421 // be on line that ends this indent range, so we
3422 // should display the range up to the first non-empty line
3423 indent.end_row = first_row.saturating_sub(1);
3424 }
3425
3426 result_vec.push(indent)
3427 }
3428 } else if depth > current_depth {
3429 for next_depth in current_depth..depth {
3430 indent_stack.push(IndentGuide {
3431 buffer_id: self.remote_id(),
3432 start_row: first_row,
3433 end_row: last_row,
3434 depth: next_depth,
3435 tab_size,
3436 settings,
3437 });
3438 }
3439 }
3440
3441 for indent in indent_stack.iter_mut() {
3442 indent.end_row = last_row;
3443 }
3444 }
3445
3446 result_vec.extend(indent_stack);
3447
3448 result_vec
3449 }
3450
3451 pub async fn enclosing_indent(
3452 &self,
3453 mut buffer_row: BufferRow,
3454 ) -> Option<(Range<BufferRow>, LineIndent)> {
3455 let max_row = self.max_point().row;
3456 if buffer_row >= max_row {
3457 return None;
3458 }
3459
3460 let mut target_indent = self.line_indent_for_row(buffer_row);
3461
3462 // If the current row is at the start of an indented block, we want to return this
3463 // block as the enclosing indent.
3464 if !target_indent.is_line_empty() && buffer_row < max_row {
3465 let next_line_indent = self.line_indent_for_row(buffer_row + 1);
3466 if !next_line_indent.is_line_empty()
3467 && target_indent.raw_len() < next_line_indent.raw_len()
3468 {
3469 target_indent = next_line_indent;
3470 buffer_row += 1;
3471 }
3472 }
3473
3474 const SEARCH_ROW_LIMIT: u32 = 25000;
3475 const SEARCH_WHITESPACE_ROW_LIMIT: u32 = 2500;
3476 const YIELD_INTERVAL: u32 = 100;
3477
3478 let mut accessed_row_counter = 0;
3479
3480 // If there is a blank line at the current row, search for the next non indented lines
3481 if target_indent.is_line_empty() {
3482 let start = buffer_row.saturating_sub(SEARCH_WHITESPACE_ROW_LIMIT);
3483 let end = (max_row + 1).min(buffer_row + SEARCH_WHITESPACE_ROW_LIMIT);
3484
3485 let mut non_empty_line_above = None;
3486 for (row, indent) in self
3487 .text
3488 .reversed_line_indents_in_row_range(start..buffer_row)
3489 {
3490 accessed_row_counter += 1;
3491 if accessed_row_counter == YIELD_INTERVAL {
3492 accessed_row_counter = 0;
3493 yield_now().await;
3494 }
3495 if !indent.is_line_empty() {
3496 non_empty_line_above = Some((row, indent));
3497 break;
3498 }
3499 }
3500
3501 let mut non_empty_line_below = None;
3502 for (row, indent) in self.text.line_indents_in_row_range((buffer_row + 1)..end) {
3503 accessed_row_counter += 1;
3504 if accessed_row_counter == YIELD_INTERVAL {
3505 accessed_row_counter = 0;
3506 yield_now().await;
3507 }
3508 if !indent.is_line_empty() {
3509 non_empty_line_below = Some((row, indent));
3510 break;
3511 }
3512 }
3513
3514 let (row, indent) = match (non_empty_line_above, non_empty_line_below) {
3515 (Some((above_row, above_indent)), Some((below_row, below_indent))) => {
3516 if above_indent.raw_len() >= below_indent.raw_len() {
3517 (above_row, above_indent)
3518 } else {
3519 (below_row, below_indent)
3520 }
3521 }
3522 (Some(above), None) => above,
3523 (None, Some(below)) => below,
3524 _ => return None,
3525 };
3526
3527 target_indent = indent;
3528 buffer_row = row;
3529 }
3530
3531 let start = buffer_row.saturating_sub(SEARCH_ROW_LIMIT);
3532 let end = (max_row + 1).min(buffer_row + SEARCH_ROW_LIMIT);
3533
3534 let mut start_indent = None;
3535 for (row, indent) in self
3536 .text
3537 .reversed_line_indents_in_row_range(start..buffer_row)
3538 {
3539 accessed_row_counter += 1;
3540 if accessed_row_counter == YIELD_INTERVAL {
3541 accessed_row_counter = 0;
3542 yield_now().await;
3543 }
3544 if !indent.is_line_empty() && indent.raw_len() < target_indent.raw_len() {
3545 start_indent = Some((row, indent));
3546 break;
3547 }
3548 }
3549 let (start_row, start_indent_size) = start_indent?;
3550
3551 let mut end_indent = (end, None);
3552 for (row, indent) in self.text.line_indents_in_row_range((buffer_row + 1)..end) {
3553 accessed_row_counter += 1;
3554 if accessed_row_counter == YIELD_INTERVAL {
3555 accessed_row_counter = 0;
3556 yield_now().await;
3557 }
3558 if !indent.is_line_empty() && indent.raw_len() < target_indent.raw_len() {
3559 end_indent = (row.saturating_sub(1), Some(indent));
3560 break;
3561 }
3562 }
3563 let (end_row, end_indent_size) = end_indent;
3564
3565 let indent = if let Some(end_indent_size) = end_indent_size {
3566 if start_indent_size.raw_len() > end_indent_size.raw_len() {
3567 start_indent_size
3568 } else {
3569 end_indent_size
3570 }
3571 } else {
3572 start_indent_size
3573 };
3574
3575 Some((start_row..end_row, indent))
3576 }
3577
3578 /// Returns selections for remote peers intersecting the given range.
3579 #[allow(clippy::type_complexity)]
3580 pub fn selections_in_range(
3581 &self,
3582 range: Range<Anchor>,
3583 include_local: bool,
3584 ) -> impl Iterator<
3585 Item = (
3586 ReplicaId,
3587 bool,
3588 CursorShape,
3589 impl Iterator<Item = &Selection<Anchor>> + '_,
3590 ),
3591 > + '_ {
3592 self.remote_selections
3593 .iter()
3594 .filter(move |(replica_id, set)| {
3595 (include_local || **replica_id != self.text.replica_id())
3596 && !set.selections.is_empty()
3597 })
3598 .map(move |(replica_id, set)| {
3599 let start_ix = match set.selections.binary_search_by(|probe| {
3600 probe.end.cmp(&range.start, self).then(Ordering::Greater)
3601 }) {
3602 Ok(ix) | Err(ix) => ix,
3603 };
3604 let end_ix = match set.selections.binary_search_by(|probe| {
3605 probe.start.cmp(&range.end, self).then(Ordering::Less)
3606 }) {
3607 Ok(ix) | Err(ix) => ix,
3608 };
3609
3610 (
3611 *replica_id,
3612 set.line_mode,
3613 set.cursor_shape,
3614 set.selections[start_ix..end_ix].iter(),
3615 )
3616 })
3617 }
3618
3619 /// Whether the buffer contains any git changes.
3620 pub fn has_git_diff(&self) -> bool {
3621 !self.git_diff.is_empty()
3622 }
3623
3624 /// Returns all the Git diff hunks intersecting the given
3625 /// row range.
3626 pub fn git_diff_hunks_in_row_range(
3627 &self,
3628 range: Range<BufferRow>,
3629 ) -> impl '_ + Iterator<Item = git::diff::DiffHunk<u32>> {
3630 self.git_diff.hunks_in_row_range(range, self)
3631 }
3632
3633 /// Returns all the Git diff hunks intersecting the given
3634 /// range.
3635 pub fn git_diff_hunks_intersecting_range(
3636 &self,
3637 range: Range<Anchor>,
3638 ) -> impl '_ + Iterator<Item = git::diff::DiffHunk<u32>> {
3639 self.git_diff.hunks_intersecting_range(range, self)
3640 }
3641
3642 /// Returns all the Git diff hunks intersecting the given
3643 /// range, in reverse order.
3644 pub fn git_diff_hunks_intersecting_range_rev(
3645 &self,
3646 range: Range<Anchor>,
3647 ) -> impl '_ + Iterator<Item = git::diff::DiffHunk<u32>> {
3648 self.git_diff.hunks_intersecting_range_rev(range, self)
3649 }
3650
3651 /// Returns if the buffer contains any diagnostics.
3652 pub fn has_diagnostics(&self) -> bool {
3653 !self.diagnostics.is_empty()
3654 }
3655
3656 /// Returns all the diagnostics intersecting the given range.
3657 pub fn diagnostics_in_range<'a, T, O>(
3658 &'a self,
3659 search_range: Range<T>,
3660 reversed: bool,
3661 ) -> impl 'a + Iterator<Item = DiagnosticEntry<O>>
3662 where
3663 T: 'a + Clone + ToOffset,
3664 O: 'a + FromAnchor + Ord,
3665 {
3666 let mut iterators: Vec<_> = self
3667 .diagnostics
3668 .iter()
3669 .map(|(_, collection)| {
3670 collection
3671 .range::<T, O>(search_range.clone(), self, true, reversed)
3672 .peekable()
3673 })
3674 .collect();
3675
3676 std::iter::from_fn(move || {
3677 let (next_ix, _) = iterators
3678 .iter_mut()
3679 .enumerate()
3680 .flat_map(|(ix, iter)| Some((ix, iter.peek()?)))
3681 .min_by(|(_, a), (_, b)| {
3682 let cmp = a
3683 .range
3684 .start
3685 .cmp(&b.range.start)
3686 // when range is equal, sort by diagnostic severity
3687 .then(a.diagnostic.severity.cmp(&b.diagnostic.severity))
3688 // and stabilize order with group_id
3689 .then(a.diagnostic.group_id.cmp(&b.diagnostic.group_id));
3690 if reversed {
3691 cmp.reverse()
3692 } else {
3693 cmp
3694 }
3695 })?;
3696 iterators[next_ix].next()
3697 })
3698 }
3699
3700 /// Returns all the diagnostic groups associated with the given
3701 /// language server id. If no language server id is provided,
3702 /// all diagnostics groups are returned.
3703 pub fn diagnostic_groups(
3704 &self,
3705 language_server_id: Option<LanguageServerId>,
3706 ) -> Vec<(LanguageServerId, DiagnosticGroup<Anchor>)> {
3707 let mut groups = Vec::new();
3708
3709 if let Some(language_server_id) = language_server_id {
3710 if let Ok(ix) = self
3711 .diagnostics
3712 .binary_search_by_key(&language_server_id, |e| e.0)
3713 {
3714 self.diagnostics[ix]
3715 .1
3716 .groups(language_server_id, &mut groups, self);
3717 }
3718 } else {
3719 for (language_server_id, diagnostics) in self.diagnostics.iter() {
3720 diagnostics.groups(*language_server_id, &mut groups, self);
3721 }
3722 }
3723
3724 groups.sort_by(|(id_a, group_a), (id_b, group_b)| {
3725 let a_start = &group_a.entries[group_a.primary_ix].range.start;
3726 let b_start = &group_b.entries[group_b.primary_ix].range.start;
3727 a_start.cmp(b_start, self).then_with(|| id_a.cmp(id_b))
3728 });
3729
3730 groups
3731 }
3732
3733 /// Returns an iterator over the diagnostics for the given group.
3734 pub fn diagnostic_group<'a, O>(
3735 &'a self,
3736 group_id: usize,
3737 ) -> impl 'a + Iterator<Item = DiagnosticEntry<O>>
3738 where
3739 O: 'a + FromAnchor,
3740 {
3741 self.diagnostics
3742 .iter()
3743 .flat_map(move |(_, set)| set.group(group_id, self))
3744 }
3745
3746 /// An integer version number that accounts for all updates besides
3747 /// the buffer's text itself (which is versioned via a version vector).
3748 pub fn non_text_state_update_count(&self) -> usize {
3749 self.non_text_state_update_count
3750 }
3751
3752 /// Returns a snapshot of underlying file.
3753 pub fn file(&self) -> Option<&Arc<dyn File>> {
3754 self.file.as_ref()
3755 }
3756
3757 /// Resolves the file path (relative to the worktree root) associated with the underlying file.
3758 pub fn resolve_file_path(&self, cx: &AppContext, include_root: bool) -> Option<PathBuf> {
3759 if let Some(file) = self.file() {
3760 if file.path().file_name().is_none() || include_root {
3761 Some(file.full_path(cx))
3762 } else {
3763 Some(file.path().to_path_buf())
3764 }
3765 } else {
3766 None
3767 }
3768 }
3769}
3770
3771fn indent_size_for_line(text: &text::BufferSnapshot, row: u32) -> IndentSize {
3772 indent_size_for_text(text.chars_at(Point::new(row, 0)))
3773}
3774
3775fn indent_size_for_text(text: impl Iterator<Item = char>) -> IndentSize {
3776 let mut result = IndentSize::spaces(0);
3777 for c in text {
3778 let kind = match c {
3779 ' ' => IndentKind::Space,
3780 '\t' => IndentKind::Tab,
3781 _ => break,
3782 };
3783 if result.len == 0 {
3784 result.kind = kind;
3785 }
3786 result.len += 1;
3787 }
3788 result
3789}
3790
3791impl Clone for BufferSnapshot {
3792 fn clone(&self) -> Self {
3793 Self {
3794 text: self.text.clone(),
3795 git_diff: self.git_diff.clone(),
3796 syntax: self.syntax.clone(),
3797 file: self.file.clone(),
3798 remote_selections: self.remote_selections.clone(),
3799 diagnostics: self.diagnostics.clone(),
3800 language: self.language.clone(),
3801 non_text_state_update_count: self.non_text_state_update_count,
3802 }
3803 }
3804}
3805
3806impl Deref for BufferSnapshot {
3807 type Target = text::BufferSnapshot;
3808
3809 fn deref(&self) -> &Self::Target {
3810 &self.text
3811 }
3812}
3813
3814unsafe impl<'a> Send for BufferChunks<'a> {}
3815
3816impl<'a> BufferChunks<'a> {
3817 pub(crate) fn new(
3818 text: &'a Rope,
3819 range: Range<usize>,
3820 syntax: Option<(SyntaxMapCaptures<'a>, Vec<HighlightMap>)>,
3821 diagnostics: bool,
3822 buffer_snapshot: Option<&'a BufferSnapshot>,
3823 ) -> Self {
3824 let mut highlights = None;
3825 if let Some((captures, highlight_maps)) = syntax {
3826 highlights = Some(BufferChunkHighlights {
3827 captures,
3828 next_capture: None,
3829 stack: Default::default(),
3830 highlight_maps,
3831 })
3832 }
3833
3834 let diagnostic_endpoints = diagnostics.then(|| Vec::new().into_iter().peekable());
3835 let chunks = text.chunks_in_range(range.clone());
3836
3837 let mut this = BufferChunks {
3838 range,
3839 buffer_snapshot,
3840 chunks,
3841 diagnostic_endpoints,
3842 error_depth: 0,
3843 warning_depth: 0,
3844 information_depth: 0,
3845 hint_depth: 0,
3846 unnecessary_depth: 0,
3847 highlights,
3848 };
3849 this.initialize_diagnostic_endpoints();
3850 this
3851 }
3852
3853 /// Seeks to the given byte offset in the buffer.
3854 pub fn seek(&mut self, range: Range<usize>) {
3855 let old_range = std::mem::replace(&mut self.range, range.clone());
3856 self.chunks.set_range(self.range.clone());
3857 if let Some(highlights) = self.highlights.as_mut() {
3858 if old_range.start >= self.range.start && old_range.end <= self.range.end {
3859 // Reuse existing highlights stack, as the new range is a subrange of the old one.
3860 highlights
3861 .stack
3862 .retain(|(end_offset, _)| *end_offset > range.start);
3863 if let Some(capture) = &highlights.next_capture {
3864 if range.start >= capture.node.start_byte() {
3865 let next_capture_end = capture.node.end_byte();
3866 if range.start < next_capture_end {
3867 highlights.stack.push((
3868 next_capture_end,
3869 highlights.highlight_maps[capture.grammar_index].get(capture.index),
3870 ));
3871 }
3872 highlights.next_capture.take();
3873 }
3874 }
3875 } else if let Some(snapshot) = self.buffer_snapshot {
3876 let (captures, highlight_maps) = snapshot.get_highlights(self.range.clone());
3877 *highlights = BufferChunkHighlights {
3878 captures,
3879 next_capture: None,
3880 stack: Default::default(),
3881 highlight_maps,
3882 };
3883 } else {
3884 // We cannot obtain new highlights for a language-aware buffer iterator, as we don't have a buffer snapshot.
3885 // Seeking such BufferChunks is not supported.
3886 debug_assert!(false, "Attempted to seek on a language-aware buffer iterator without associated buffer snapshot");
3887 }
3888
3889 highlights.captures.set_byte_range(self.range.clone());
3890 self.initialize_diagnostic_endpoints();
3891 }
3892 }
3893
3894 fn initialize_diagnostic_endpoints(&mut self) {
3895 if let Some(diagnostics) = self.diagnostic_endpoints.as_mut() {
3896 if let Some(buffer) = self.buffer_snapshot {
3897 let mut diagnostic_endpoints = Vec::new();
3898 for entry in buffer.diagnostics_in_range::<_, usize>(self.range.clone(), false) {
3899 diagnostic_endpoints.push(DiagnosticEndpoint {
3900 offset: entry.range.start,
3901 is_start: true,
3902 severity: entry.diagnostic.severity,
3903 is_unnecessary: entry.diagnostic.is_unnecessary,
3904 });
3905 diagnostic_endpoints.push(DiagnosticEndpoint {
3906 offset: entry.range.end,
3907 is_start: false,
3908 severity: entry.diagnostic.severity,
3909 is_unnecessary: entry.diagnostic.is_unnecessary,
3910 });
3911 }
3912 diagnostic_endpoints
3913 .sort_unstable_by_key(|endpoint| (endpoint.offset, !endpoint.is_start));
3914 *diagnostics = diagnostic_endpoints.into_iter().peekable();
3915 }
3916 }
3917 }
3918
3919 /// The current byte offset in the buffer.
3920 pub fn offset(&self) -> usize {
3921 self.range.start
3922 }
3923
3924 fn update_diagnostic_depths(&mut self, endpoint: DiagnosticEndpoint) {
3925 let depth = match endpoint.severity {
3926 DiagnosticSeverity::ERROR => &mut self.error_depth,
3927 DiagnosticSeverity::WARNING => &mut self.warning_depth,
3928 DiagnosticSeverity::INFORMATION => &mut self.information_depth,
3929 DiagnosticSeverity::HINT => &mut self.hint_depth,
3930 _ => return,
3931 };
3932 if endpoint.is_start {
3933 *depth += 1;
3934 } else {
3935 *depth -= 1;
3936 }
3937
3938 if endpoint.is_unnecessary {
3939 if endpoint.is_start {
3940 self.unnecessary_depth += 1;
3941 } else {
3942 self.unnecessary_depth -= 1;
3943 }
3944 }
3945 }
3946
3947 fn current_diagnostic_severity(&self) -> Option<DiagnosticSeverity> {
3948 if self.error_depth > 0 {
3949 Some(DiagnosticSeverity::ERROR)
3950 } else if self.warning_depth > 0 {
3951 Some(DiagnosticSeverity::WARNING)
3952 } else if self.information_depth > 0 {
3953 Some(DiagnosticSeverity::INFORMATION)
3954 } else if self.hint_depth > 0 {
3955 Some(DiagnosticSeverity::HINT)
3956 } else {
3957 None
3958 }
3959 }
3960
3961 fn current_code_is_unnecessary(&self) -> bool {
3962 self.unnecessary_depth > 0
3963 }
3964}
3965
3966impl<'a> Iterator for BufferChunks<'a> {
3967 type Item = Chunk<'a>;
3968
3969 fn next(&mut self) -> Option<Self::Item> {
3970 let mut next_capture_start = usize::MAX;
3971 let mut next_diagnostic_endpoint = usize::MAX;
3972
3973 if let Some(highlights) = self.highlights.as_mut() {
3974 while let Some((parent_capture_end, _)) = highlights.stack.last() {
3975 if *parent_capture_end <= self.range.start {
3976 highlights.stack.pop();
3977 } else {
3978 break;
3979 }
3980 }
3981
3982 if highlights.next_capture.is_none() {
3983 highlights.next_capture = highlights.captures.next();
3984 }
3985
3986 while let Some(capture) = highlights.next_capture.as_ref() {
3987 if self.range.start < capture.node.start_byte() {
3988 next_capture_start = capture.node.start_byte();
3989 break;
3990 } else {
3991 let highlight_id =
3992 highlights.highlight_maps[capture.grammar_index].get(capture.index);
3993 highlights
3994 .stack
3995 .push((capture.node.end_byte(), highlight_id));
3996 highlights.next_capture = highlights.captures.next();
3997 }
3998 }
3999 }
4000
4001 let mut diagnostic_endpoints = std::mem::take(&mut self.diagnostic_endpoints);
4002 if let Some(diagnostic_endpoints) = diagnostic_endpoints.as_mut() {
4003 while let Some(endpoint) = diagnostic_endpoints.peek().copied() {
4004 if endpoint.offset <= self.range.start {
4005 self.update_diagnostic_depths(endpoint);
4006 diagnostic_endpoints.next();
4007 } else {
4008 next_diagnostic_endpoint = endpoint.offset;
4009 break;
4010 }
4011 }
4012 }
4013 self.diagnostic_endpoints = diagnostic_endpoints;
4014
4015 if let Some(chunk) = self.chunks.peek() {
4016 let chunk_start = self.range.start;
4017 let mut chunk_end = (self.chunks.offset() + chunk.len())
4018 .min(next_capture_start)
4019 .min(next_diagnostic_endpoint);
4020 let mut highlight_id = None;
4021 if let Some(highlights) = self.highlights.as_ref() {
4022 if let Some((parent_capture_end, parent_highlight_id)) = highlights.stack.last() {
4023 chunk_end = chunk_end.min(*parent_capture_end);
4024 highlight_id = Some(*parent_highlight_id);
4025 }
4026 }
4027
4028 let slice =
4029 &chunk[chunk_start - self.chunks.offset()..chunk_end - self.chunks.offset()];
4030 self.range.start = chunk_end;
4031 if self.range.start == self.chunks.offset() + chunk.len() {
4032 self.chunks.next().unwrap();
4033 }
4034
4035 Some(Chunk {
4036 text: slice,
4037 syntax_highlight_id: highlight_id,
4038 diagnostic_severity: self.current_diagnostic_severity(),
4039 is_unnecessary: self.current_code_is_unnecessary(),
4040 ..Default::default()
4041 })
4042 } else {
4043 None
4044 }
4045 }
4046}
4047
4048impl operation_queue::Operation for Operation {
4049 fn lamport_timestamp(&self) -> clock::Lamport {
4050 match self {
4051 Operation::Buffer(_) => {
4052 unreachable!("buffer operations should never be deferred at this layer")
4053 }
4054 Operation::UpdateDiagnostics {
4055 lamport_timestamp, ..
4056 }
4057 | Operation::UpdateSelections {
4058 lamport_timestamp, ..
4059 }
4060 | Operation::UpdateCompletionTriggers {
4061 lamport_timestamp, ..
4062 } => *lamport_timestamp,
4063 }
4064 }
4065}
4066
4067impl Default for Diagnostic {
4068 fn default() -> Self {
4069 Self {
4070 source: Default::default(),
4071 code: None,
4072 severity: DiagnosticSeverity::ERROR,
4073 message: Default::default(),
4074 group_id: 0,
4075 is_primary: false,
4076 is_disk_based: false,
4077 is_unnecessary: false,
4078 data: None,
4079 }
4080 }
4081}
4082
4083impl IndentSize {
4084 /// Returns an [IndentSize] representing the given spaces.
4085 pub fn spaces(len: u32) -> Self {
4086 Self {
4087 len,
4088 kind: IndentKind::Space,
4089 }
4090 }
4091
4092 /// Returns an [IndentSize] representing a tab.
4093 pub fn tab() -> Self {
4094 Self {
4095 len: 1,
4096 kind: IndentKind::Tab,
4097 }
4098 }
4099
4100 /// An iterator over the characters represented by this [IndentSize].
4101 pub fn chars(&self) -> impl Iterator<Item = char> {
4102 iter::repeat(self.char()).take(self.len as usize)
4103 }
4104
4105 /// The character representation of this [IndentSize].
4106 pub fn char(&self) -> char {
4107 match self.kind {
4108 IndentKind::Space => ' ',
4109 IndentKind::Tab => '\t',
4110 }
4111 }
4112
4113 /// Consumes the current [IndentSize] and returns a new one that has
4114 /// been shrunk or enlarged by the given size along the given direction.
4115 pub fn with_delta(mut self, direction: Ordering, size: IndentSize) -> Self {
4116 match direction {
4117 Ordering::Less => {
4118 if self.kind == size.kind && self.len >= size.len {
4119 self.len -= size.len;
4120 }
4121 }
4122 Ordering::Equal => {}
4123 Ordering::Greater => {
4124 if self.len == 0 {
4125 self = size;
4126 } else if self.kind == size.kind {
4127 self.len += size.len;
4128 }
4129 }
4130 }
4131 self
4132 }
4133}
4134
4135#[cfg(any(test, feature = "test-support"))]
4136pub struct TestFile {
4137 pub path: Arc<Path>,
4138 pub root_name: String,
4139}
4140
4141#[cfg(any(test, feature = "test-support"))]
4142impl File for TestFile {
4143 fn path(&self) -> &Arc<Path> {
4144 &self.path
4145 }
4146
4147 fn full_path(&self, _: &gpui::AppContext) -> PathBuf {
4148 PathBuf::from(&self.root_name).join(self.path.as_ref())
4149 }
4150
4151 fn as_local(&self) -> Option<&dyn LocalFile> {
4152 None
4153 }
4154
4155 fn mtime(&self) -> Option<SystemTime> {
4156 unimplemented!()
4157 }
4158
4159 fn file_name<'a>(&'a self, _: &'a gpui::AppContext) -> &'a std::ffi::OsStr {
4160 self.path().file_name().unwrap_or(self.root_name.as_ref())
4161 }
4162
4163 fn worktree_id(&self) -> usize {
4164 0
4165 }
4166
4167 fn is_deleted(&self) -> bool {
4168 unimplemented!()
4169 }
4170
4171 fn as_any(&self) -> &dyn std::any::Any {
4172 unimplemented!()
4173 }
4174
4175 fn to_proto(&self, _: &AppContext) -> rpc::proto::File {
4176 unimplemented!()
4177 }
4178
4179 fn is_private(&self) -> bool {
4180 false
4181 }
4182}
4183
4184pub(crate) fn contiguous_ranges(
4185 values: impl Iterator<Item = u32>,
4186 max_len: usize,
4187) -> impl Iterator<Item = Range<u32>> {
4188 let mut values = values;
4189 let mut current_range: Option<Range<u32>> = None;
4190 std::iter::from_fn(move || loop {
4191 if let Some(value) = values.next() {
4192 if let Some(range) = &mut current_range {
4193 if value == range.end && range.len() < max_len {
4194 range.end += 1;
4195 continue;
4196 }
4197 }
4198
4199 let prev_range = current_range.clone();
4200 current_range = Some(value..(value + 1));
4201 if prev_range.is_some() {
4202 return prev_range;
4203 }
4204 } else {
4205 return current_range.take();
4206 }
4207 })
4208}
4209
4210/// Returns the [CharKind] for the given character. When a scope is provided,
4211/// the function checks if the character is considered a word character
4212/// based on the language scope's word character settings.
4213pub fn char_kind(scope: &Option<LanguageScope>, c: char) -> CharKind {
4214 if c.is_whitespace() {
4215 return CharKind::Whitespace;
4216 } else if c.is_alphanumeric() || c == '_' {
4217 return CharKind::Word;
4218 }
4219
4220 if let Some(scope) = scope {
4221 if let Some(characters) = scope.word_characters() {
4222 if characters.contains(&c) {
4223 return CharKind::Word;
4224 }
4225 }
4226 }
4227
4228 CharKind::Punctuation
4229}
4230
4231/// Find all of the ranges of whitespace that occur at the ends of lines
4232/// in the given rope.
4233///
4234/// This could also be done with a regex search, but this implementation
4235/// avoids copying text.
4236pub fn trailing_whitespace_ranges(rope: &Rope) -> Vec<Range<usize>> {
4237 let mut ranges = Vec::new();
4238
4239 let mut offset = 0;
4240 let mut prev_chunk_trailing_whitespace_range = 0..0;
4241 for chunk in rope.chunks() {
4242 let mut prev_line_trailing_whitespace_range = 0..0;
4243 for (i, line) in chunk.split('\n').enumerate() {
4244 let line_end_offset = offset + line.len();
4245 let trimmed_line_len = line.trim_end_matches(|c| matches!(c, ' ' | '\t')).len();
4246 let mut trailing_whitespace_range = (offset + trimmed_line_len)..line_end_offset;
4247
4248 if i == 0 && trimmed_line_len == 0 {
4249 trailing_whitespace_range.start = prev_chunk_trailing_whitespace_range.start;
4250 }
4251 if !prev_line_trailing_whitespace_range.is_empty() {
4252 ranges.push(prev_line_trailing_whitespace_range);
4253 }
4254
4255 offset = line_end_offset + 1;
4256 prev_line_trailing_whitespace_range = trailing_whitespace_range;
4257 }
4258
4259 offset -= 1;
4260 prev_chunk_trailing_whitespace_range = prev_line_trailing_whitespace_range;
4261 }
4262
4263 if !prev_chunk_trailing_whitespace_range.is_empty() {
4264 ranges.push(prev_chunk_trailing_whitespace_range);
4265 }
4266
4267 ranges
4268}