1use crate::diagnostic_set::{DiagnosticEntry, DiagnosticGroup};
   2pub use crate::{
   3    diagnostic_set::DiagnosticSet,
   4    highlight_map::{HighlightId, HighlightMap},
   5    proto, BracketPair, Grammar, Language, LanguageConfig, LanguageRegistry, LanguageServerConfig,
   6    PLAIN_TEXT,
   7};
   8use anyhow::{anyhow, Result};
   9use clock::ReplicaId;
  10use collections::hash_map;
  11use futures::FutureExt as _;
  12use gpui::{fonts::HighlightStyle, AppContext, Entity, ModelContext, MutableAppContext, Task};
  13use lazy_static::lazy_static;
  14use lsp::LanguageServer;
  15use parking_lot::Mutex;
  16use postage::{prelude::Stream, sink::Sink, watch};
  17use similar::{ChangeTag, TextDiff};
  18use smol::future::yield_now;
  19use std::{
  20    any::Any,
  21    cell::RefCell,
  22    cmp::{self, Ordering},
  23    collections::{BTreeMap, HashMap, HashSet},
  24    ffi::OsString,
  25    future::Future,
  26    iter::{Iterator, Peekable},
  27    ops::{Deref, DerefMut, Range},
  28    path::{Path, PathBuf},
  29    str,
  30    sync::Arc,
  31    time::{Duration, Instant, SystemTime, UNIX_EPOCH},
  32    vec,
  33};
  34use sum_tree::TreeMap;
  35use text::operation_queue::OperationQueue;
  36pub use text::{Buffer as TextBuffer, Operation as _, *};
  37use theme::SyntaxTheme;
  38use tree_sitter::{InputEdit, Parser, QueryCursor, Tree};
  39use util::{post_inc, TryFutureExt as _};
  40
  41#[cfg(any(test, feature = "test-support"))]
  42pub use tree_sitter_rust;
  43
  44pub use lsp::DiagnosticSeverity;
  45
  46thread_local! {
  47    static PARSER: RefCell<Parser> = RefCell::new(Parser::new());
  48}
  49
  50lazy_static! {
  51    static ref QUERY_CURSORS: Mutex<Vec<QueryCursor>> = Default::default();
  52}
  53
  54// TODO - Make this configurable
  55const INDENT_SIZE: u32 = 4;
  56
  57pub struct Buffer {
  58    text: TextBuffer,
  59    file: Option<Box<dyn File>>,
  60    saved_version: clock::Global,
  61    saved_mtime: SystemTime,
  62    language: Option<Arc<Language>>,
  63    autoindent_requests: Vec<Arc<AutoindentRequest>>,
  64    pending_autoindent: Option<Task<()>>,
  65    sync_parse_timeout: Duration,
  66    syntax_tree: Mutex<Option<SyntaxTree>>,
  67    parsing_in_background: bool,
  68    parse_count: usize,
  69    remote_selections: TreeMap<ReplicaId, Arc<[Selection<Anchor>]>>,
  70    diagnostics: DiagnosticSet,
  71    diagnostics_update_count: usize,
  72    clear_invalid_diagnostics_task: Option<Task<()>>,
  73    next_diagnostic_group_id: usize,
  74    language_server: Option<LanguageServerState>,
  75    deferred_ops: OperationQueue<Operation>,
  76    #[cfg(test)]
  77    pub(crate) operations: Vec<Operation>,
  78}
  79
  80pub struct BufferSnapshot {
  81    text: text::BufferSnapshot,
  82    tree: Option<Tree>,
  83    diagnostics: DiagnosticSet,
  84    remote_selections: TreeMap<ReplicaId, Arc<[Selection<Anchor>]>>,
  85    diagnostics_update_count: usize,
  86    is_parsing: bool,
  87    language: Option<Arc<Language>>,
  88    parse_count: usize,
  89}
  90
  91#[derive(Clone, Debug, PartialEq, Eq)]
  92pub struct Diagnostic {
  93    pub source: Option<String>,
  94    pub code: Option<String>,
  95    pub severity: DiagnosticSeverity,
  96    pub message: String,
  97    pub group_id: usize,
  98    pub is_valid: bool,
  99    pub is_primary: bool,
 100}
 101
 102struct LanguageServerState {
 103    server: Arc<LanguageServer>,
 104    latest_snapshot: watch::Sender<Option<LanguageServerSnapshot>>,
 105    pending_snapshots: BTreeMap<usize, LanguageServerSnapshot>,
 106    next_version: usize,
 107    _maintain_server: Task<Option<()>>,
 108}
 109
 110#[derive(Clone)]
 111struct LanguageServerSnapshot {
 112    buffer_snapshot: text::BufferSnapshot,
 113    version: usize,
 114    path: Arc<Path>,
 115}
 116
 117#[derive(Clone, Debug)]
 118pub enum Operation {
 119    Buffer(text::Operation),
 120    UpdateDiagnostics {
 121        diagnostics: Arc<[DiagnosticEntry<Anchor>]>,
 122        lamport_timestamp: clock::Lamport,
 123    },
 124    UpdateSelections {
 125        replica_id: ReplicaId,
 126        selections: Arc<[Selection<Anchor>]>,
 127        lamport_timestamp: clock::Lamport,
 128    },
 129    RemoveSelections {
 130        replica_id: ReplicaId,
 131        lamport_timestamp: clock::Lamport,
 132    },
 133}
 134
 135#[derive(Clone, Debug, Eq, PartialEq)]
 136pub enum Event {
 137    Edited,
 138    Dirtied,
 139    Saved,
 140    FileHandleChanged,
 141    Reloaded,
 142    Reparsed,
 143    DiagnosticsUpdated,
 144    Closed,
 145}
 146
 147pub trait File {
 148    fn worktree_id(&self) -> usize;
 149
 150    fn entry_id(&self) -> Option<usize>;
 151
 152    fn mtime(&self) -> SystemTime;
 153
 154    /// Returns the path of this file relative to the worktree's root directory.
 155    fn path(&self) -> &Arc<Path>;
 156
 157    /// Returns the absolute path of this file.
 158    fn abs_path(&self) -> Option<PathBuf>;
 159
 160    /// Returns the path of this file relative to the worktree's parent directory (this means it
 161    /// includes the name of the worktree's root folder).
 162    fn full_path(&self) -> PathBuf;
 163
 164    /// Returns the last component of this handle's absolute path. If this handle refers to the root
 165    /// of its worktree, then this method will return the name of the worktree itself.
 166    fn file_name(&self) -> Option<OsString>;
 167
 168    fn is_deleted(&self) -> bool;
 169
 170    fn save(
 171        &self,
 172        buffer_id: u64,
 173        text: Rope,
 174        version: clock::Global,
 175        cx: &mut MutableAppContext,
 176    ) -> Task<Result<(clock::Global, SystemTime)>>;
 177
 178    fn load_local(&self, cx: &AppContext) -> Option<Task<Result<String>>>;
 179
 180    fn buffer_updated(&self, buffer_id: u64, operation: Operation, cx: &mut MutableAppContext);
 181
 182    fn buffer_removed(&self, buffer_id: u64, cx: &mut MutableAppContext);
 183
 184    fn boxed_clone(&self) -> Box<dyn File>;
 185
 186    fn as_any(&self) -> &dyn Any;
 187}
 188
 189struct QueryCursorHandle(Option<QueryCursor>);
 190
 191#[derive(Clone)]
 192struct SyntaxTree {
 193    tree: Tree,
 194    version: clock::Global,
 195}
 196
 197#[derive(Clone)]
 198struct AutoindentRequest {
 199    before_edit: BufferSnapshot,
 200    edited: Vec<Anchor>,
 201    inserted: Option<Vec<Range<Anchor>>>,
 202}
 203
 204#[derive(Debug)]
 205struct IndentSuggestion {
 206    basis_row: u32,
 207    indent: bool,
 208}
 209
 210struct TextProvider<'a>(&'a Rope);
 211
 212struct BufferChunkHighlights<'a> {
 213    captures: tree_sitter::QueryCaptures<'a, 'a, TextProvider<'a>>,
 214    next_capture: Option<(tree_sitter::QueryMatch<'a, 'a>, usize)>,
 215    stack: Vec<(usize, HighlightId)>,
 216    highlight_map: HighlightMap,
 217    theme: &'a SyntaxTheme,
 218    _query_cursor: QueryCursorHandle,
 219}
 220
 221pub struct BufferChunks<'a> {
 222    range: Range<usize>,
 223    chunks: rope::Chunks<'a>,
 224    diagnostic_endpoints: Peekable<vec::IntoIter<DiagnosticEndpoint>>,
 225    error_depth: usize,
 226    warning_depth: usize,
 227    information_depth: usize,
 228    hint_depth: usize,
 229    highlights: Option<BufferChunkHighlights<'a>>,
 230}
 231
 232#[derive(Clone, Copy, Debug, Default)]
 233pub struct Chunk<'a> {
 234    pub text: &'a str,
 235    pub highlight_style: Option<HighlightStyle>,
 236    pub diagnostic: Option<DiagnosticSeverity>,
 237}
 238
 239pub(crate) struct Diff {
 240    base_version: clock::Global,
 241    new_text: Arc<str>,
 242    changes: Vec<(ChangeTag, usize)>,
 243}
 244
 245#[derive(Clone, Copy)]
 246struct DiagnosticEndpoint {
 247    offset: usize,
 248    is_start: bool,
 249    severity: DiagnosticSeverity,
 250}
 251
 252impl Buffer {
 253    pub fn new<T: Into<Arc<str>>>(
 254        replica_id: ReplicaId,
 255        base_text: T,
 256        cx: &mut ModelContext<Self>,
 257    ) -> Self {
 258        Self::build(
 259            TextBuffer::new(
 260                replica_id,
 261                cx.model_id() as u64,
 262                History::new(base_text.into()),
 263            ),
 264            None,
 265        )
 266    }
 267
 268    pub fn from_file<T: Into<Arc<str>>>(
 269        replica_id: ReplicaId,
 270        base_text: T,
 271        file: Box<dyn File>,
 272        cx: &mut ModelContext<Self>,
 273    ) -> Self {
 274        Self::build(
 275            TextBuffer::new(
 276                replica_id,
 277                cx.model_id() as u64,
 278                History::new(base_text.into()),
 279            ),
 280            Some(file),
 281        )
 282    }
 283
 284    pub fn from_proto(
 285        replica_id: ReplicaId,
 286        message: proto::Buffer,
 287        file: Option<Box<dyn File>>,
 288        cx: &mut ModelContext<Self>,
 289    ) -> Result<Self> {
 290        let mut buffer =
 291            text::Buffer::new(replica_id, message.id, History::new(message.content.into()));
 292        let ops = message
 293            .history
 294            .into_iter()
 295            .map(|op| text::Operation::Edit(proto::deserialize_edit_operation(op)));
 296        buffer.apply_ops(ops)?;
 297        let mut this = Self::build(buffer, file);
 298        for selection_set in message.selections {
 299            this.remote_selections.insert(
 300                selection_set.replica_id as ReplicaId,
 301                proto::deserialize_selections(selection_set.selections),
 302            );
 303        }
 304        this.apply_diagnostic_update(
 305            Arc::from(proto::deserialize_diagnostics(message.diagnostics)),
 306            cx,
 307        );
 308
 309        Ok(this)
 310    }
 311
 312    pub fn to_proto(&self) -> proto::Buffer {
 313        proto::Buffer {
 314            id: self.remote_id(),
 315            content: self.text.base_text().to_string(),
 316            history: self
 317                .text
 318                .history()
 319                .map(proto::serialize_edit_operation)
 320                .collect(),
 321            selections: self
 322                .remote_selections
 323                .iter()
 324                .map(|(replica_id, selections)| proto::SelectionSet {
 325                    replica_id: *replica_id as u32,
 326                    selections: proto::serialize_selections(selections),
 327                })
 328                .collect(),
 329            diagnostics: proto::serialize_diagnostics(self.diagnostics.iter()),
 330        }
 331    }
 332
 333    pub fn with_language(
 334        mut self,
 335        language: Option<Arc<Language>>,
 336        language_server: Option<Arc<LanguageServer>>,
 337        cx: &mut ModelContext<Self>,
 338    ) -> Self {
 339        self.set_language(language, language_server, cx);
 340        self
 341    }
 342
 343    fn build(buffer: TextBuffer, file: Option<Box<dyn File>>) -> Self {
 344        let saved_mtime;
 345        if let Some(file) = file.as_ref() {
 346            saved_mtime = file.mtime();
 347        } else {
 348            saved_mtime = UNIX_EPOCH;
 349        }
 350
 351        Self {
 352            saved_mtime,
 353            saved_version: buffer.version(),
 354            text: buffer,
 355            file,
 356            syntax_tree: Mutex::new(None),
 357            parsing_in_background: false,
 358            parse_count: 0,
 359            sync_parse_timeout: Duration::from_millis(1),
 360            autoindent_requests: Default::default(),
 361            pending_autoindent: Default::default(),
 362            language: None,
 363            remote_selections: Default::default(),
 364            diagnostics: Default::default(),
 365            diagnostics_update_count: 0,
 366            next_diagnostic_group_id: 0,
 367            clear_invalid_diagnostics_task: None,
 368            language_server: None,
 369            deferred_ops: OperationQueue::new(),
 370            #[cfg(test)]
 371            operations: Default::default(),
 372        }
 373    }
 374
 375    pub fn snapshot(&self) -> BufferSnapshot {
 376        BufferSnapshot {
 377            text: self.text.snapshot(),
 378            tree: self.syntax_tree(),
 379            remote_selections: self.remote_selections.clone(),
 380            diagnostics: self.diagnostics.clone(),
 381            diagnostics_update_count: self.diagnostics_update_count,
 382            is_parsing: self.parsing_in_background,
 383            language: self.language.clone(),
 384            parse_count: self.parse_count,
 385        }
 386    }
 387
 388    pub fn file(&self) -> Option<&dyn File> {
 389        self.file.as_deref()
 390    }
 391
 392    pub fn save(
 393        &mut self,
 394        cx: &mut ModelContext<Self>,
 395    ) -> Result<Task<Result<(clock::Global, SystemTime)>>> {
 396        let file = self
 397            .file
 398            .as_ref()
 399            .ok_or_else(|| anyhow!("buffer has no file"))?;
 400        let text = self.as_rope().clone();
 401        let version = self.version();
 402        let save = file.save(self.remote_id(), text, version, cx.as_mut());
 403        Ok(cx.spawn(|this, mut cx| async move {
 404            let (version, mtime) = save.await?;
 405            this.update(&mut cx, |this, cx| {
 406                this.did_save(version.clone(), mtime, None, cx);
 407            });
 408            Ok((version, mtime))
 409        }))
 410    }
 411
 412    pub fn set_language(
 413        &mut self,
 414        language: Option<Arc<Language>>,
 415        language_server: Option<Arc<lsp::LanguageServer>>,
 416        cx: &mut ModelContext<Self>,
 417    ) {
 418        self.language = language;
 419        self.language_server = if let Some(server) = language_server {
 420            let (latest_snapshot_tx, mut latest_snapshot_rx) = watch::channel();
 421            Some(LanguageServerState {
 422                latest_snapshot: latest_snapshot_tx,
 423                pending_snapshots: Default::default(),
 424                next_version: 0,
 425                server: server.clone(),
 426                _maintain_server: cx.background().spawn(
 427                    async move {
 428                        let mut prev_snapshot: Option<LanguageServerSnapshot> = None;
 429                        while let Some(snapshot) = latest_snapshot_rx.recv().await {
 430                            if let Some(snapshot) = snapshot {
 431                                let uri = lsp::Url::from_file_path(&snapshot.path).unwrap();
 432                                if let Some(prev_snapshot) = prev_snapshot {
 433                                    let changes = lsp::DidChangeTextDocumentParams {
 434                                        text_document: lsp::VersionedTextDocumentIdentifier::new(
 435                                            uri,
 436                                            snapshot.version as i32,
 437                                        ),
 438                                        content_changes: snapshot
 439                                            .buffer_snapshot
 440                                            .edits_since::<(PointUtf16, usize)>(
 441                                                prev_snapshot.buffer_snapshot.version(),
 442                                            )
 443                                            .map(|edit| {
 444                                                let edit_start = edit.new.start.0;
 445                                                let edit_end = edit_start
 446                                                    + (edit.old.end.0 - edit.old.start.0);
 447                                                let new_text = snapshot
 448                                                    .buffer_snapshot
 449                                                    .text_for_range(
 450                                                        edit.new.start.1..edit.new.end.1,
 451                                                    )
 452                                                    .collect();
 453                                                lsp::TextDocumentContentChangeEvent {
 454                                                    range: Some(lsp::Range::new(
 455                                                        lsp::Position::new(
 456                                                            edit_start.row,
 457                                                            edit_start.column,
 458                                                        ),
 459                                                        lsp::Position::new(
 460                                                            edit_end.row,
 461                                                            edit_end.column,
 462                                                        ),
 463                                                    )),
 464                                                    range_length: None,
 465                                                    text: new_text,
 466                                                }
 467                                            })
 468                                            .collect(),
 469                                    };
 470                                    server
 471                                        .notify::<lsp::notification::DidChangeTextDocument>(changes)
 472                                        .await?;
 473                                } else {
 474                                    server
 475                                        .notify::<lsp::notification::DidOpenTextDocument>(
 476                                            lsp::DidOpenTextDocumentParams {
 477                                                text_document: lsp::TextDocumentItem::new(
 478                                                    uri,
 479                                                    Default::default(),
 480                                                    snapshot.version as i32,
 481                                                    snapshot.buffer_snapshot.text().to_string(),
 482                                                ),
 483                                            },
 484                                        )
 485                                        .await?;
 486                                }
 487
 488                                prev_snapshot = Some(snapshot);
 489                            }
 490                        }
 491                        Ok(())
 492                    }
 493                    .log_err(),
 494                ),
 495            })
 496        } else {
 497            None
 498        };
 499
 500        self.reparse(cx);
 501        self.update_language_server();
 502    }
 503
 504    pub fn did_save(
 505        &mut self,
 506        version: clock::Global,
 507        mtime: SystemTime,
 508        new_file: Option<Box<dyn File>>,
 509        cx: &mut ModelContext<Self>,
 510    ) {
 511        self.saved_mtime = mtime;
 512        self.saved_version = version;
 513        if let Some(new_file) = new_file {
 514            self.file = Some(new_file);
 515        }
 516        if let Some(state) = &self.language_server {
 517            cx.background()
 518                .spawn(
 519                    state
 520                        .server
 521                        .notify::<lsp::notification::DidSaveTextDocument>(
 522                            lsp::DidSaveTextDocumentParams {
 523                                text_document: lsp::TextDocumentIdentifier {
 524                                    uri: lsp::Url::from_file_path(
 525                                        self.file.as_ref().unwrap().abs_path().unwrap(),
 526                                    )
 527                                    .unwrap(),
 528                                },
 529                                text: None,
 530                            },
 531                        ),
 532                )
 533                .detach()
 534        }
 535        cx.emit(Event::Saved);
 536    }
 537
 538    pub fn file_updated(
 539        &mut self,
 540        new_file: Box<dyn File>,
 541        cx: &mut ModelContext<Self>,
 542    ) -> Option<Task<()>> {
 543        let old_file = self.file.as_ref()?;
 544        let mut file_changed = false;
 545        let mut task = None;
 546
 547        if new_file.path() != old_file.path() {
 548            file_changed = true;
 549        }
 550
 551        if new_file.is_deleted() {
 552            if !old_file.is_deleted() {
 553                file_changed = true;
 554                if !self.is_dirty() {
 555                    cx.emit(Event::Dirtied);
 556                }
 557            }
 558        } else {
 559            let new_mtime = new_file.mtime();
 560            if new_mtime != old_file.mtime() {
 561                file_changed = true;
 562
 563                if !self.is_dirty() {
 564                    task = Some(cx.spawn(|this, mut cx| {
 565                        async move {
 566                            let new_text = this.read_with(&cx, |this, cx| {
 567                                this.file.as_ref().and_then(|file| file.load_local(cx))
 568                            });
 569                            if let Some(new_text) = new_text {
 570                                let new_text = new_text.await?;
 571                                let diff = this
 572                                    .read_with(&cx, |this, cx| this.diff(new_text.into(), cx))
 573                                    .await;
 574                                this.update(&mut cx, |this, cx| {
 575                                    if this.apply_diff(diff, cx) {
 576                                        this.saved_version = this.version();
 577                                        this.saved_mtime = new_mtime;
 578                                        cx.emit(Event::Reloaded);
 579                                    }
 580                                });
 581                            }
 582                            Ok(())
 583                        }
 584                        .log_err()
 585                        .map(drop)
 586                    }));
 587                }
 588            }
 589        }
 590
 591        if file_changed {
 592            cx.emit(Event::FileHandleChanged);
 593        }
 594        self.file = Some(new_file);
 595        task
 596    }
 597
 598    pub fn close(&mut self, cx: &mut ModelContext<Self>) {
 599        cx.emit(Event::Closed);
 600    }
 601
 602    pub fn language(&self) -> Option<&Arc<Language>> {
 603        self.language.as_ref()
 604    }
 605
 606    pub fn parse_count(&self) -> usize {
 607        self.parse_count
 608    }
 609
 610    pub fn diagnostics_update_count(&self) -> usize {
 611        self.diagnostics_update_count
 612    }
 613
 614    pub(crate) fn syntax_tree(&self) -> Option<Tree> {
 615        if let Some(syntax_tree) = self.syntax_tree.lock().as_mut() {
 616            self.interpolate_tree(syntax_tree);
 617            Some(syntax_tree.tree.clone())
 618        } else {
 619            None
 620        }
 621    }
 622
 623    #[cfg(any(test, feature = "test-support"))]
 624    pub fn is_parsing(&self) -> bool {
 625        self.parsing_in_background
 626    }
 627
 628    #[cfg(test)]
 629    pub fn set_sync_parse_timeout(&mut self, timeout: Duration) {
 630        self.sync_parse_timeout = timeout;
 631    }
 632
 633    fn reparse(&mut self, cx: &mut ModelContext<Self>) -> bool {
 634        if self.parsing_in_background {
 635            return false;
 636        }
 637
 638        if let Some(grammar) = self.grammar().cloned() {
 639            let old_tree = self.syntax_tree();
 640            let text = self.as_rope().clone();
 641            let parsed_version = self.version();
 642            let parse_task = cx.background().spawn({
 643                let grammar = grammar.clone();
 644                async move { Self::parse_text(&text, old_tree, &grammar) }
 645            });
 646
 647            match cx
 648                .background()
 649                .block_with_timeout(self.sync_parse_timeout, parse_task)
 650            {
 651                Ok(new_tree) => {
 652                    self.did_finish_parsing(new_tree, parsed_version, cx);
 653                    return true;
 654                }
 655                Err(parse_task) => {
 656                    self.parsing_in_background = true;
 657                    cx.spawn(move |this, mut cx| async move {
 658                        let new_tree = parse_task.await;
 659                        this.update(&mut cx, move |this, cx| {
 660                            let grammar_changed = this
 661                                .grammar()
 662                                .map_or(true, |curr_grammar| !Arc::ptr_eq(&grammar, curr_grammar));
 663                            let parse_again = this.version.gt(&parsed_version) || grammar_changed;
 664                            this.parsing_in_background = false;
 665                            this.did_finish_parsing(new_tree, parsed_version, cx);
 666
 667                            if parse_again && this.reparse(cx) {
 668                                return;
 669                            }
 670                        });
 671                    })
 672                    .detach();
 673                }
 674            }
 675        }
 676        false
 677    }
 678
 679    fn parse_text(text: &Rope, old_tree: Option<Tree>, grammar: &Grammar) -> Tree {
 680        PARSER.with(|parser| {
 681            let mut parser = parser.borrow_mut();
 682            parser
 683                .set_language(grammar.ts_language)
 684                .expect("incompatible grammar");
 685            let mut chunks = text.chunks_in_range(0..text.len());
 686            let tree = parser
 687                .parse_with(
 688                    &mut move |offset, _| {
 689                        chunks.seek(offset);
 690                        chunks.next().unwrap_or("").as_bytes()
 691                    },
 692                    old_tree.as_ref(),
 693                )
 694                .unwrap();
 695            tree
 696        })
 697    }
 698
 699    fn interpolate_tree(&self, tree: &mut SyntaxTree) {
 700        for edit in self.edits_since::<(usize, Point)>(&tree.version) {
 701            let (bytes, lines) = edit.flatten();
 702            tree.tree.edit(&InputEdit {
 703                start_byte: bytes.new.start,
 704                old_end_byte: bytes.new.start + bytes.old.len(),
 705                new_end_byte: bytes.new.end,
 706                start_position: lines.new.start.to_ts_point(),
 707                old_end_position: (lines.new.start + (lines.old.end - lines.old.start))
 708                    .to_ts_point(),
 709                new_end_position: lines.new.end.to_ts_point(),
 710            });
 711        }
 712        tree.version = self.version();
 713    }
 714
 715    fn did_finish_parsing(
 716        &mut self,
 717        tree: Tree,
 718        version: clock::Global,
 719        cx: &mut ModelContext<Self>,
 720    ) {
 721        self.parse_count += 1;
 722        *self.syntax_tree.lock() = Some(SyntaxTree { tree, version });
 723        self.request_autoindent(cx);
 724        cx.emit(Event::Reparsed);
 725        cx.notify();
 726    }
 727
 728    pub fn all_diagnostics<'a>(&'a self) -> impl 'a + Iterator<Item = &'a DiagnosticEntry<Anchor>> {
 729        self.diagnostics.iter()
 730    }
 731
 732    pub fn update_diagnostics(
 733        &mut self,
 734        version: Option<i32>,
 735        mut diagnostics: Vec<DiagnosticEntry<PointUtf16>>,
 736        cx: &mut ModelContext<Self>,
 737    ) -> Result<Operation> {
 738        fn compare_diagnostics(a: &Diagnostic, b: &Diagnostic) -> Ordering {
 739            Ordering::Equal
 740                .then_with(|| b.is_primary.cmp(&a.is_primary))
 741                .then_with(|| a.source.cmp(&b.source))
 742                .then_with(|| a.severity.cmp(&b.severity))
 743                .then_with(|| a.message.cmp(&b.message))
 744        }
 745
 746        diagnostics.sort_unstable_by(|a, b| {
 747            Ordering::Equal
 748                .then_with(|| a.range.start.cmp(&b.range.start))
 749                .then_with(|| b.range.end.cmp(&a.range.end))
 750                .then_with(|| compare_diagnostics(&a.diagnostic, &b.diagnostic))
 751        });
 752
 753        let version = version.map(|version| version as usize);
 754        let content = if let Some(version) = version {
 755            let language_server = self.language_server.as_mut().unwrap();
 756            language_server
 757                .pending_snapshots
 758                .retain(|&v, _| v >= version);
 759            let snapshot = language_server
 760                .pending_snapshots
 761                .get(&version)
 762                .ok_or_else(|| anyhow!("missing snapshot"))?;
 763            &snapshot.buffer_snapshot
 764        } else {
 765            self.deref()
 766        };
 767
 768        let empty_set = HashSet::new();
 769        let disk_based_sources = self
 770            .language
 771            .as_ref()
 772            .and_then(|language| language.disk_based_diagnostic_sources())
 773            .unwrap_or(&empty_set);
 774
 775        let mut edits_since_save = content
 776            .edits_since::<PointUtf16>(&self.saved_version)
 777            .peekable();
 778        let mut last_edit_old_end = PointUtf16::zero();
 779        let mut last_edit_new_end = PointUtf16::zero();
 780        let mut has_disk_based_diagnostics = false;
 781        let mut ix = 0;
 782        'outer: while ix < diagnostics.len() {
 783            let entry = &mut diagnostics[ix];
 784            let mut start = entry.range.start;
 785            let mut end = entry.range.end;
 786
 787            // Some diagnostics are based on files on disk instead of buffers'
 788            // current contents. Adjust these diagnostics' ranges to reflect
 789            // any unsaved edits.
 790            if entry
 791                .diagnostic
 792                .source
 793                .as_ref()
 794                .map_or(false, |source| disk_based_sources.contains(source))
 795            {
 796                has_disk_based_diagnostics = true;
 797                while let Some(edit) = edits_since_save.peek() {
 798                    if edit.old.end <= start {
 799                        last_edit_old_end = edit.old.end;
 800                        last_edit_new_end = edit.new.end;
 801                        edits_since_save.next();
 802                    } else if edit.old.start <= end && edit.old.end >= start {
 803                        diagnostics.remove(ix);
 804                        continue 'outer;
 805                    } else {
 806                        break;
 807                    }
 808                }
 809
 810                start = last_edit_new_end + (start - last_edit_old_end);
 811                end = last_edit_new_end + (end - last_edit_old_end);
 812            }
 813
 814            entry.range = content.clip_point_utf16(start, Bias::Left)
 815                ..content.clip_point_utf16(end, Bias::Right);
 816
 817            // Expand empty ranges by one character
 818            if entry.range.start == entry.range.end {
 819                entry.range.end.column += 1;
 820                entry.range.end = content.clip_point_utf16(entry.range.end, Bias::Right);
 821                if entry.range.start == entry.range.end && entry.range.end.column > 0 {
 822                    entry.range.start.column -= 1;
 823                    entry.range.start = content.clip_point_utf16(entry.range.start, Bias::Left);
 824                }
 825            }
 826            ix += 1;
 827        }
 828        drop(edits_since_save);
 829
 830        let mut merged_diagnostics = Vec::with_capacity(diagnostics.len());
 831        let mut old_diagnostics = self
 832            .diagnostics
 833            .iter()
 834            .map(|entry| {
 835                (
 836                    entry,
 837                    entry
 838                        .diagnostic
 839                        .source
 840                        .as_ref()
 841                        .map_or(false, |source| disk_based_sources.contains(source)),
 842                )
 843            })
 844            .peekable();
 845        let mut new_diagnostics = diagnostics
 846            .into_iter()
 847            .map(|entry| DiagnosticEntry {
 848                range: content.anchor_before(entry.range.start)
 849                    ..content.anchor_after(entry.range.end),
 850                diagnostic: entry.diagnostic,
 851            })
 852            .peekable();
 853
 854        // Incorporate the *old* diagnostics into the new diagnostics set, in two ways:
 855        // 1. Recycle group ids - diagnostic groups whose primary diagnostic has not
 856        //    changed should use the same group id as before, so that downstream code
 857        //    can determine which diagnostics are new.
 858        // 2. Preserve disk-based diagnostics - Some diagnostic sources are reported
 859        //    on a less frequent basis than others. If these sources are absent from this
 860        //    message, then preserve the previous diagnostics for those sources, but mark
 861        //    them as invalid, and set a timer to clear them out.
 862        let mut group_id_replacements = HashMap::new();
 863        let mut merged_old_disk_based_diagnostics = false;
 864        loop {
 865            match (old_diagnostics.peek(), new_diagnostics.peek()) {
 866                (None, None) => break,
 867                (None, Some(_)) => {
 868                    merged_diagnostics.push(new_diagnostics.next().unwrap());
 869                }
 870                (Some(_), None) => {
 871                    let (old_entry, is_disk_based) = old_diagnostics.next().unwrap();
 872                    if is_disk_based && !has_disk_based_diagnostics {
 873                        let mut old_entry = old_entry.clone();
 874                        old_entry.diagnostic.is_valid = false;
 875                        merged_old_disk_based_diagnostics = true;
 876                        merged_diagnostics.push(old_entry);
 877                    }
 878                }
 879                (Some((old, _)), Some(new)) => {
 880                    let ordering = Ordering::Equal
 881                        .then_with(|| old.range.start.cmp(&new.range.start, content).unwrap())
 882                        .then_with(|| new.range.end.cmp(&old.range.end, content).unwrap())
 883                        .then_with(|| compare_diagnostics(&old.diagnostic, &new.diagnostic));
 884                    match ordering {
 885                        Ordering::Less => {
 886                            let (old_entry, is_disk_based) = old_diagnostics.next().unwrap();
 887                            if is_disk_based && !has_disk_based_diagnostics {
 888                                let mut old_entry = old_entry.clone();
 889                                old_entry.diagnostic.is_valid = false;
 890                                merged_old_disk_based_diagnostics = true;
 891                                merged_diagnostics.push(old_entry);
 892                            }
 893                        }
 894                        Ordering::Equal => {
 895                            let (old_entry, _) = old_diagnostics.next().unwrap();
 896                            let new_entry = new_diagnostics.next().unwrap();
 897                            if new_entry.diagnostic.is_primary {
 898                                group_id_replacements.insert(
 899                                    new_entry.diagnostic.group_id,
 900                                    old_entry.diagnostic.group_id,
 901                                );
 902                            }
 903                            merged_diagnostics.push(new_entry);
 904                        }
 905                        Ordering::Greater => {
 906                            let new_entry = new_diagnostics.next().unwrap();
 907                            merged_diagnostics.push(new_entry);
 908                        }
 909                    }
 910                }
 911            }
 912        }
 913        drop(old_diagnostics);
 914
 915        // Having determined which group ids should be recycled, renumber all of
 916        // groups. Any new group that does not correspond to an old group receives
 917        // a brand new group id.
 918        let mut next_diagnostic_group_id = self.next_diagnostic_group_id;
 919        for entry in &mut merged_diagnostics {
 920            if entry.diagnostic.is_valid {
 921                match group_id_replacements.entry(entry.diagnostic.group_id) {
 922                    hash_map::Entry::Occupied(e) => entry.diagnostic.group_id = *e.get(),
 923                    hash_map::Entry::Vacant(e) => {
 924                        entry.diagnostic.group_id = post_inc(&mut next_diagnostic_group_id);
 925                        e.insert(entry.diagnostic.group_id);
 926                    }
 927                }
 928            }
 929        }
 930
 931        self.diagnostics = DiagnosticSet::from_sorted_entries(merged_diagnostics, content);
 932        self.next_diagnostic_group_id = next_diagnostic_group_id;
 933
 934        // If old disk-based diagnostics were included in this new set, then
 935        // set a timer to remove them if enough time passes before the next
 936        // diagnostics update.
 937        if merged_old_disk_based_diagnostics {
 938            self.clear_invalid_diagnostics_task = Some(cx.spawn(|this, mut cx| async move {
 939                smol::Timer::after(Duration::from_secs(2)).await;
 940                this.update(&mut cx, |this, cx| {
 941                    let content = this.snapshot();
 942                    this.diagnostics = DiagnosticSet::from_sorted_entries(
 943                        this.diagnostics
 944                            .iter()
 945                            .filter(|d| d.diagnostic.is_valid)
 946                            .cloned(),
 947                        &content,
 948                    );
 949                    let operation = this.did_update_diagnostics(cx);
 950                    this.send_operation(operation, cx);
 951                });
 952            }));
 953        } else if has_disk_based_diagnostics {
 954            self.clear_invalid_diagnostics_task.take();
 955        }
 956
 957        Ok(self.did_update_diagnostics(cx))
 958    }
 959
 960    fn did_update_diagnostics(&mut self, cx: &mut ModelContext<Self>) -> Operation {
 961        self.diagnostics_update_count += 1;
 962        cx.notify();
 963        cx.emit(Event::DiagnosticsUpdated);
 964        Operation::UpdateDiagnostics {
 965            diagnostics: Arc::from(self.diagnostics.iter().cloned().collect::<Vec<_>>()),
 966            lamport_timestamp: self.text.lamport_clock.tick(),
 967        }
 968    }
 969
 970    fn request_autoindent(&mut self, cx: &mut ModelContext<Self>) {
 971        if let Some(indent_columns) = self.compute_autoindents() {
 972            let indent_columns = cx.background().spawn(indent_columns);
 973            match cx
 974                .background()
 975                .block_with_timeout(Duration::from_micros(500), indent_columns)
 976            {
 977                Ok(indent_columns) => self.apply_autoindents(indent_columns, cx),
 978                Err(indent_columns) => {
 979                    self.pending_autoindent = Some(cx.spawn(|this, mut cx| async move {
 980                        let indent_columns = indent_columns.await;
 981                        this.update(&mut cx, |this, cx| {
 982                            this.apply_autoindents(indent_columns, cx);
 983                        });
 984                    }));
 985                }
 986            }
 987        }
 988    }
 989
 990    fn compute_autoindents(&self) -> Option<impl Future<Output = BTreeMap<u32, u32>>> {
 991        let max_rows_between_yields = 100;
 992        let snapshot = self.snapshot();
 993        if snapshot.language.is_none()
 994            || snapshot.tree.is_none()
 995            || self.autoindent_requests.is_empty()
 996        {
 997            return None;
 998        }
 999
1000        let autoindent_requests = self.autoindent_requests.clone();
1001        Some(async move {
1002            let mut indent_columns = BTreeMap::new();
1003            for request in autoindent_requests {
1004                let old_to_new_rows = request
1005                    .edited
1006                    .iter()
1007                    .map(|anchor| anchor.summary::<Point>(&request.before_edit).row)
1008                    .zip(
1009                        request
1010                            .edited
1011                            .iter()
1012                            .map(|anchor| anchor.summary::<Point>(&snapshot).row),
1013                    )
1014                    .collect::<BTreeMap<u32, u32>>();
1015
1016                let mut old_suggestions = HashMap::<u32, u32>::default();
1017                let old_edited_ranges =
1018                    contiguous_ranges(old_to_new_rows.keys().copied(), max_rows_between_yields);
1019                for old_edited_range in old_edited_ranges {
1020                    let suggestions = request
1021                        .before_edit
1022                        .suggest_autoindents(old_edited_range.clone())
1023                        .into_iter()
1024                        .flatten();
1025                    for (old_row, suggestion) in old_edited_range.zip(suggestions) {
1026                        let indentation_basis = old_to_new_rows
1027                            .get(&suggestion.basis_row)
1028                            .and_then(|from_row| old_suggestions.get(from_row).copied())
1029                            .unwrap_or_else(|| {
1030                                request
1031                                    .before_edit
1032                                    .indent_column_for_line(suggestion.basis_row)
1033                            });
1034                        let delta = if suggestion.indent { INDENT_SIZE } else { 0 };
1035                        old_suggestions.insert(
1036                            *old_to_new_rows.get(&old_row).unwrap(),
1037                            indentation_basis + delta,
1038                        );
1039                    }
1040                    yield_now().await;
1041                }
1042
1043                // At this point, old_suggestions contains the suggested indentation for all edited lines with respect to the state of the
1044                // buffer before the edit, but keyed by the row for these lines after the edits were applied.
1045                let new_edited_row_ranges =
1046                    contiguous_ranges(old_to_new_rows.values().copied(), max_rows_between_yields);
1047                for new_edited_row_range in new_edited_row_ranges {
1048                    let suggestions = snapshot
1049                        .suggest_autoindents(new_edited_row_range.clone())
1050                        .into_iter()
1051                        .flatten();
1052                    for (new_row, suggestion) in new_edited_row_range.zip(suggestions) {
1053                        let delta = if suggestion.indent { INDENT_SIZE } else { 0 };
1054                        let new_indentation = indent_columns
1055                            .get(&suggestion.basis_row)
1056                            .copied()
1057                            .unwrap_or_else(|| {
1058                                snapshot.indent_column_for_line(suggestion.basis_row)
1059                            })
1060                            + delta;
1061                        if old_suggestions
1062                            .get(&new_row)
1063                            .map_or(true, |old_indentation| new_indentation != *old_indentation)
1064                        {
1065                            indent_columns.insert(new_row, new_indentation);
1066                        }
1067                    }
1068                    yield_now().await;
1069                }
1070
1071                if let Some(inserted) = request.inserted.as_ref() {
1072                    let inserted_row_ranges = contiguous_ranges(
1073                        inserted
1074                            .iter()
1075                            .map(|range| range.to_point(&snapshot))
1076                            .flat_map(|range| range.start.row..range.end.row + 1),
1077                        max_rows_between_yields,
1078                    );
1079                    for inserted_row_range in inserted_row_ranges {
1080                        let suggestions = snapshot
1081                            .suggest_autoindents(inserted_row_range.clone())
1082                            .into_iter()
1083                            .flatten();
1084                        for (row, suggestion) in inserted_row_range.zip(suggestions) {
1085                            let delta = if suggestion.indent { INDENT_SIZE } else { 0 };
1086                            let new_indentation = indent_columns
1087                                .get(&suggestion.basis_row)
1088                                .copied()
1089                                .unwrap_or_else(|| {
1090                                    snapshot.indent_column_for_line(suggestion.basis_row)
1091                                })
1092                                + delta;
1093                            indent_columns.insert(row, new_indentation);
1094                        }
1095                        yield_now().await;
1096                    }
1097                }
1098            }
1099            indent_columns
1100        })
1101    }
1102
1103    fn apply_autoindents(
1104        &mut self,
1105        indent_columns: BTreeMap<u32, u32>,
1106        cx: &mut ModelContext<Self>,
1107    ) {
1108        self.start_transaction();
1109        for (row, indent_column) in &indent_columns {
1110            self.set_indent_column_for_line(*row, *indent_column, cx);
1111        }
1112        self.end_transaction(cx);
1113    }
1114
1115    fn set_indent_column_for_line(&mut self, row: u32, column: u32, cx: &mut ModelContext<Self>) {
1116        let current_column = self.indent_column_for_line(row);
1117        if column > current_column {
1118            let offset = Point::new(row, 0).to_offset(&*self);
1119            self.edit(
1120                [offset..offset],
1121                " ".repeat((column - current_column) as usize),
1122                cx,
1123            );
1124        } else if column < current_column {
1125            self.edit(
1126                [Point::new(row, 0)..Point::new(row, current_column - column)],
1127                "",
1128                cx,
1129            );
1130        }
1131    }
1132
1133    pub(crate) fn diff(&self, new_text: Arc<str>, cx: &AppContext) -> Task<Diff> {
1134        // TODO: it would be nice to not allocate here.
1135        let old_text = self.text();
1136        let base_version = self.version();
1137        cx.background().spawn(async move {
1138            let changes = TextDiff::from_lines(old_text.as_str(), new_text.as_ref())
1139                .iter_all_changes()
1140                .map(|c| (c.tag(), c.value().len()))
1141                .collect::<Vec<_>>();
1142            Diff {
1143                base_version,
1144                new_text,
1145                changes,
1146            }
1147        })
1148    }
1149
1150    pub(crate) fn apply_diff(&mut self, diff: Diff, cx: &mut ModelContext<Self>) -> bool {
1151        if self.version == diff.base_version {
1152            self.start_transaction();
1153            let mut offset = 0;
1154            for (tag, len) in diff.changes {
1155                let range = offset..(offset + len);
1156                match tag {
1157                    ChangeTag::Equal => offset += len,
1158                    ChangeTag::Delete => self.edit(Some(range), "", cx),
1159                    ChangeTag::Insert => {
1160                        self.edit(Some(offset..offset), &diff.new_text[range], cx);
1161                        offset += len;
1162                    }
1163                }
1164            }
1165            self.end_transaction(cx);
1166            true
1167        } else {
1168            false
1169        }
1170    }
1171
1172    pub fn is_dirty(&self) -> bool {
1173        !self.saved_version.ge(&self.version)
1174            || self.file.as_ref().map_or(false, |file| file.is_deleted())
1175    }
1176
1177    pub fn has_conflict(&self) -> bool {
1178        !self.saved_version.ge(&self.version)
1179            && self
1180                .file
1181                .as_ref()
1182                .map_or(false, |file| file.mtime() > self.saved_mtime)
1183    }
1184
1185    pub fn subscribe(&mut self) -> Subscription {
1186        self.text.subscribe()
1187    }
1188
1189    pub fn start_transaction(&mut self) -> Option<TransactionId> {
1190        self.start_transaction_at(Instant::now())
1191    }
1192
1193    pub fn start_transaction_at(&mut self, now: Instant) -> Option<TransactionId> {
1194        self.text.start_transaction_at(now)
1195    }
1196
1197    pub fn end_transaction(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
1198        self.end_transaction_at(Instant::now(), cx)
1199    }
1200
1201    pub fn end_transaction_at(
1202        &mut self,
1203        now: Instant,
1204        cx: &mut ModelContext<Self>,
1205    ) -> Option<TransactionId> {
1206        if let Some((transaction_id, start_version)) = self.text.end_transaction_at(now) {
1207            let was_dirty = start_version != self.saved_version;
1208            self.did_edit(&start_version, was_dirty, cx);
1209            Some(transaction_id)
1210        } else {
1211            None
1212        }
1213    }
1214
1215    pub fn set_active_selections(
1216        &mut self,
1217        selections: Arc<[Selection<Anchor>]>,
1218        cx: &mut ModelContext<Self>,
1219    ) {
1220        let lamport_timestamp = self.text.lamport_clock.tick();
1221        self.remote_selections
1222            .insert(self.text.replica_id(), selections.clone());
1223        self.send_operation(
1224            Operation::UpdateSelections {
1225                replica_id: self.text.replica_id(),
1226                selections,
1227                lamport_timestamp,
1228            },
1229            cx,
1230        );
1231    }
1232
1233    pub fn remove_active_selections(&mut self, cx: &mut ModelContext<Self>) {
1234        let lamport_timestamp = self.text.lamport_clock.tick();
1235        self.send_operation(
1236            Operation::RemoveSelections {
1237                replica_id: self.text.replica_id(),
1238                lamport_timestamp,
1239            },
1240            cx,
1241        );
1242    }
1243
1244    fn update_language_server(&mut self) {
1245        let language_server = if let Some(language_server) = self.language_server.as_mut() {
1246            language_server
1247        } else {
1248            return;
1249        };
1250        let abs_path = self
1251            .file
1252            .as_ref()
1253            .map_or(Path::new("/").to_path_buf(), |file| {
1254                file.abs_path().unwrap()
1255            });
1256
1257        let version = post_inc(&mut language_server.next_version);
1258        let snapshot = LanguageServerSnapshot {
1259            buffer_snapshot: self.text.snapshot(),
1260            version,
1261            path: Arc::from(abs_path),
1262        };
1263        language_server
1264            .pending_snapshots
1265            .insert(version, snapshot.clone());
1266        let _ = language_server
1267            .latest_snapshot
1268            .blocking_send(Some(snapshot));
1269    }
1270
1271    pub fn edit<I, S, T>(&mut self, ranges_iter: I, new_text: T, cx: &mut ModelContext<Self>)
1272    where
1273        I: IntoIterator<Item = Range<S>>,
1274        S: ToOffset,
1275        T: Into<String>,
1276    {
1277        self.edit_internal(ranges_iter, new_text, false, cx)
1278    }
1279
1280    pub fn edit_with_autoindent<I, S, T>(
1281        &mut self,
1282        ranges_iter: I,
1283        new_text: T,
1284        cx: &mut ModelContext<Self>,
1285    ) where
1286        I: IntoIterator<Item = Range<S>>,
1287        S: ToOffset,
1288        T: Into<String>,
1289    {
1290        self.edit_internal(ranges_iter, new_text, true, cx)
1291    }
1292
1293    pub fn edit_internal<I, S, T>(
1294        &mut self,
1295        ranges_iter: I,
1296        new_text: T,
1297        autoindent: bool,
1298        cx: &mut ModelContext<Self>,
1299    ) where
1300        I: IntoIterator<Item = Range<S>>,
1301        S: ToOffset,
1302        T: Into<String>,
1303    {
1304        let new_text = new_text.into();
1305
1306        // Skip invalid ranges and coalesce contiguous ones.
1307        let mut ranges: Vec<Range<usize>> = Vec::new();
1308        for range in ranges_iter {
1309            let range = range.start.to_offset(self)..range.end.to_offset(self);
1310            if !new_text.is_empty() || !range.is_empty() {
1311                if let Some(prev_range) = ranges.last_mut() {
1312                    if prev_range.end >= range.start {
1313                        prev_range.end = cmp::max(prev_range.end, range.end);
1314                    } else {
1315                        ranges.push(range);
1316                    }
1317                } else {
1318                    ranges.push(range);
1319                }
1320            }
1321        }
1322        if ranges.is_empty() {
1323            return;
1324        }
1325
1326        self.start_transaction();
1327        self.pending_autoindent.take();
1328        let autoindent_request = if autoindent && self.language.is_some() {
1329            let before_edit = self.snapshot();
1330            let edited = ranges
1331                .iter()
1332                .filter_map(|range| {
1333                    let start = range.start.to_point(self);
1334                    if new_text.starts_with('\n') && start.column == self.line_len(start.row) {
1335                        None
1336                    } else {
1337                        Some(self.anchor_before(range.start))
1338                    }
1339                })
1340                .collect();
1341            Some((before_edit, edited))
1342        } else {
1343            None
1344        };
1345
1346        let first_newline_ix = new_text.find('\n');
1347        let new_text_len = new_text.len();
1348
1349        let edit = self.text.edit(ranges.iter().cloned(), new_text);
1350
1351        if let Some((before_edit, edited)) = autoindent_request {
1352            let mut inserted = None;
1353            if let Some(first_newline_ix) = first_newline_ix {
1354                let mut delta = 0isize;
1355                inserted = Some(
1356                    ranges
1357                        .iter()
1358                        .map(|range| {
1359                            let start =
1360                                (delta + range.start as isize) as usize + first_newline_ix + 1;
1361                            let end = (delta + range.start as isize) as usize + new_text_len;
1362                            delta +=
1363                                (range.end as isize - range.start as isize) + new_text_len as isize;
1364                            self.anchor_before(start)..self.anchor_after(end)
1365                        })
1366                        .collect(),
1367                );
1368            }
1369
1370            self.autoindent_requests.push(Arc::new(AutoindentRequest {
1371                before_edit,
1372                edited,
1373                inserted,
1374            }));
1375        }
1376
1377        self.end_transaction(cx);
1378        self.send_operation(Operation::Buffer(text::Operation::Edit(edit)), cx);
1379    }
1380
1381    fn did_edit(
1382        &mut self,
1383        old_version: &clock::Global,
1384        was_dirty: bool,
1385        cx: &mut ModelContext<Self>,
1386    ) {
1387        if self.edits_since::<usize>(old_version).next().is_none() {
1388            return;
1389        }
1390
1391        self.reparse(cx);
1392        self.update_language_server();
1393
1394        cx.emit(Event::Edited);
1395        if !was_dirty {
1396            cx.emit(Event::Dirtied);
1397        }
1398        cx.notify();
1399    }
1400
1401    fn grammar(&self) -> Option<&Arc<Grammar>> {
1402        self.language.as_ref().and_then(|l| l.grammar.as_ref())
1403    }
1404
1405    pub fn apply_ops<I: IntoIterator<Item = Operation>>(
1406        &mut self,
1407        ops: I,
1408        cx: &mut ModelContext<Self>,
1409    ) -> Result<()> {
1410        self.pending_autoindent.take();
1411        let was_dirty = self.is_dirty();
1412        let old_version = self.version.clone();
1413        let mut deferred_ops = Vec::new();
1414        let buffer_ops = ops
1415            .into_iter()
1416            .filter_map(|op| match op {
1417                Operation::Buffer(op) => Some(op),
1418                _ => {
1419                    if self.can_apply_op(&op) {
1420                        self.apply_op(op, cx);
1421                    } else {
1422                        deferred_ops.push(op);
1423                    }
1424                    None
1425                }
1426            })
1427            .collect::<Vec<_>>();
1428        self.text.apply_ops(buffer_ops)?;
1429        self.flush_deferred_ops(cx);
1430        self.did_edit(&old_version, was_dirty, cx);
1431        // Notify independently of whether the buffer was edited as the operations could include a
1432        // selection update.
1433        cx.notify();
1434        Ok(())
1435    }
1436
1437    fn flush_deferred_ops(&mut self, cx: &mut ModelContext<Self>) {
1438        let mut deferred_ops = Vec::new();
1439        for op in self.deferred_ops.drain().iter().cloned() {
1440            if self.can_apply_op(&op) {
1441                self.apply_op(op, cx);
1442            } else {
1443                deferred_ops.push(op);
1444            }
1445        }
1446        self.deferred_ops.insert(deferred_ops);
1447    }
1448
1449    fn can_apply_op(&self, operation: &Operation) -> bool {
1450        match operation {
1451            Operation::Buffer(_) => {
1452                unreachable!("buffer operations should never be applied at this layer")
1453            }
1454            Operation::UpdateDiagnostics { diagnostics, .. } => {
1455                diagnostics.iter().all(|diagnostic| {
1456                    self.text.can_resolve(&diagnostic.range.start)
1457                        && self.text.can_resolve(&diagnostic.range.end)
1458                })
1459            }
1460            Operation::UpdateSelections { selections, .. } => selections
1461                .iter()
1462                .all(|s| self.can_resolve(&s.start) && self.can_resolve(&s.end)),
1463            Operation::RemoveSelections { .. } => true,
1464        }
1465    }
1466
1467    fn apply_op(&mut self, operation: Operation, cx: &mut ModelContext<Self>) {
1468        match operation {
1469            Operation::Buffer(_) => {
1470                unreachable!("buffer operations should never be applied at this layer")
1471            }
1472            Operation::UpdateDiagnostics { diagnostics, .. } => {
1473                self.apply_diagnostic_update(diagnostics, cx);
1474            }
1475            Operation::UpdateSelections {
1476                replica_id,
1477                selections,
1478                lamport_timestamp,
1479            } => {
1480                self.remote_selections.insert(replica_id, selections);
1481                self.text.lamport_clock.observe(lamport_timestamp);
1482            }
1483            Operation::RemoveSelections {
1484                replica_id,
1485                lamport_timestamp,
1486            } => {
1487                self.remote_selections.remove(&replica_id);
1488                self.text.lamport_clock.observe(lamport_timestamp);
1489            }
1490        }
1491    }
1492
1493    fn apply_diagnostic_update(
1494        &mut self,
1495        diagnostics: Arc<[DiagnosticEntry<Anchor>]>,
1496        cx: &mut ModelContext<Self>,
1497    ) {
1498        self.diagnostics = DiagnosticSet::from_sorted_entries(diagnostics.iter().cloned(), self);
1499        self.diagnostics_update_count += 1;
1500        cx.notify();
1501    }
1502
1503    #[cfg(not(test))]
1504    pub fn send_operation(&mut self, operation: Operation, cx: &mut ModelContext<Self>) {
1505        if let Some(file) = &self.file {
1506            file.buffer_updated(self.remote_id(), operation, cx.as_mut());
1507        }
1508    }
1509
1510    #[cfg(test)]
1511    pub fn send_operation(&mut self, operation: Operation, _: &mut ModelContext<Self>) {
1512        self.operations.push(operation);
1513    }
1514
1515    pub fn remove_peer(&mut self, replica_id: ReplicaId, cx: &mut ModelContext<Self>) {
1516        self.remote_selections.remove(&replica_id);
1517        cx.notify();
1518    }
1519
1520    pub fn undo(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
1521        let was_dirty = self.is_dirty();
1522        let old_version = self.version.clone();
1523
1524        if let Some((transaction_id, operation)) = self.text.undo() {
1525            self.send_operation(Operation::Buffer(operation), cx);
1526            self.did_edit(&old_version, was_dirty, cx);
1527            Some(transaction_id)
1528        } else {
1529            None
1530        }
1531    }
1532
1533    pub fn undo_transaction(
1534        &mut self,
1535        transaction_id: TransactionId,
1536        cx: &mut ModelContext<Self>,
1537    ) -> bool {
1538        let was_dirty = self.is_dirty();
1539        let old_version = self.version.clone();
1540
1541        if let Some(operation) = self.text.undo_transaction(transaction_id) {
1542            self.send_operation(Operation::Buffer(operation), cx);
1543            self.did_edit(&old_version, was_dirty, cx);
1544            true
1545        } else {
1546            false
1547        }
1548    }
1549
1550    pub fn redo(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
1551        let was_dirty = self.is_dirty();
1552        let old_version = self.version.clone();
1553
1554        if let Some((transaction_id, operation)) = self.text.redo() {
1555            self.send_operation(Operation::Buffer(operation), cx);
1556            self.did_edit(&old_version, was_dirty, cx);
1557            Some(transaction_id)
1558        } else {
1559            None
1560        }
1561    }
1562
1563    pub fn redo_transaction(
1564        &mut self,
1565        transaction_id: TransactionId,
1566        cx: &mut ModelContext<Self>,
1567    ) -> bool {
1568        let was_dirty = self.is_dirty();
1569        let old_version = self.version.clone();
1570
1571        if let Some(operation) = self.text.redo_transaction(transaction_id) {
1572            self.send_operation(Operation::Buffer(operation), cx);
1573            self.did_edit(&old_version, was_dirty, cx);
1574            true
1575        } else {
1576            false
1577        }
1578    }
1579}
1580
1581#[cfg(any(test, feature = "test-support"))]
1582impl Buffer {
1583    pub fn randomly_edit<T>(
1584        &mut self,
1585        rng: &mut T,
1586        old_range_count: usize,
1587        cx: &mut ModelContext<Self>,
1588    ) where
1589        T: rand::Rng,
1590    {
1591        self.start_transaction();
1592        self.text.randomly_edit(rng, old_range_count);
1593        self.end_transaction(cx);
1594    }
1595}
1596
1597impl Entity for Buffer {
1598    type Event = Event;
1599
1600    fn release(&mut self, cx: &mut gpui::MutableAppContext) {
1601        if let Some(file) = self.file.as_ref() {
1602            file.buffer_removed(self.remote_id(), cx);
1603        }
1604    }
1605}
1606
1607impl Deref for Buffer {
1608    type Target = TextBuffer;
1609
1610    fn deref(&self) -> &Self::Target {
1611        &self.text
1612    }
1613}
1614
1615impl BufferSnapshot {
1616    fn suggest_autoindents<'a>(
1617        &'a self,
1618        row_range: Range<u32>,
1619    ) -> Option<impl Iterator<Item = IndentSuggestion> + 'a> {
1620        let mut query_cursor = QueryCursorHandle::new();
1621        if let Some((grammar, tree)) = self.grammar().zip(self.tree.as_ref()) {
1622            let prev_non_blank_row = self.prev_non_blank_row(row_range.start);
1623
1624            // Get the "indentation ranges" that intersect this row range.
1625            let indent_capture_ix = grammar.indents_query.capture_index_for_name("indent");
1626            let end_capture_ix = grammar.indents_query.capture_index_for_name("end");
1627            query_cursor.set_point_range(
1628                Point::new(prev_non_blank_row.unwrap_or(row_range.start), 0).to_ts_point()
1629                    ..Point::new(row_range.end, 0).to_ts_point(),
1630            );
1631            let mut indentation_ranges = Vec::<(Range<Point>, &'static str)>::new();
1632            for mat in query_cursor.matches(
1633                &grammar.indents_query,
1634                tree.root_node(),
1635                TextProvider(self.as_rope()),
1636            ) {
1637                let mut node_kind = "";
1638                let mut start: Option<Point> = None;
1639                let mut end: Option<Point> = None;
1640                for capture in mat.captures {
1641                    if Some(capture.index) == indent_capture_ix {
1642                        node_kind = capture.node.kind();
1643                        start.get_or_insert(Point::from_ts_point(capture.node.start_position()));
1644                        end.get_or_insert(Point::from_ts_point(capture.node.end_position()));
1645                    } else if Some(capture.index) == end_capture_ix {
1646                        end = Some(Point::from_ts_point(capture.node.start_position().into()));
1647                    }
1648                }
1649
1650                if let Some((start, end)) = start.zip(end) {
1651                    if start.row == end.row {
1652                        continue;
1653                    }
1654
1655                    let range = start..end;
1656                    match indentation_ranges.binary_search_by_key(&range.start, |r| r.0.start) {
1657                        Err(ix) => indentation_ranges.insert(ix, (range, node_kind)),
1658                        Ok(ix) => {
1659                            let prev_range = &mut indentation_ranges[ix];
1660                            prev_range.0.end = prev_range.0.end.max(range.end);
1661                        }
1662                    }
1663                }
1664            }
1665
1666            let mut prev_row = prev_non_blank_row.unwrap_or(0);
1667            Some(row_range.map(move |row| {
1668                let row_start = Point::new(row, self.indent_column_for_line(row));
1669
1670                let mut indent_from_prev_row = false;
1671                let mut outdent_to_row = u32::MAX;
1672                for (range, _node_kind) in &indentation_ranges {
1673                    if range.start.row >= row {
1674                        break;
1675                    }
1676
1677                    if range.start.row == prev_row && range.end > row_start {
1678                        indent_from_prev_row = true;
1679                    }
1680                    if range.end.row >= prev_row && range.end <= row_start {
1681                        outdent_to_row = outdent_to_row.min(range.start.row);
1682                    }
1683                }
1684
1685                let suggestion = if outdent_to_row == prev_row {
1686                    IndentSuggestion {
1687                        basis_row: prev_row,
1688                        indent: false,
1689                    }
1690                } else if indent_from_prev_row {
1691                    IndentSuggestion {
1692                        basis_row: prev_row,
1693                        indent: true,
1694                    }
1695                } else if outdent_to_row < prev_row {
1696                    IndentSuggestion {
1697                        basis_row: outdent_to_row,
1698                        indent: false,
1699                    }
1700                } else {
1701                    IndentSuggestion {
1702                        basis_row: prev_row,
1703                        indent: false,
1704                    }
1705                };
1706
1707                prev_row = row;
1708                suggestion
1709            }))
1710        } else {
1711            None
1712        }
1713    }
1714
1715    fn prev_non_blank_row(&self, mut row: u32) -> Option<u32> {
1716        while row > 0 {
1717            row -= 1;
1718            if !self.is_line_blank(row) {
1719                return Some(row);
1720            }
1721        }
1722        None
1723    }
1724
1725    pub fn chunks<'a, T: ToOffset>(
1726        &'a self,
1727        range: Range<T>,
1728        theme: Option<&'a SyntaxTheme>,
1729    ) -> BufferChunks<'a> {
1730        let range = range.start.to_offset(self)..range.end.to_offset(self);
1731
1732        let mut highlights = None;
1733        let mut diagnostic_endpoints = Vec::<DiagnosticEndpoint>::new();
1734        if let Some(theme) = theme {
1735            for entry in self
1736                .diagnostics
1737                .range::<_, usize>(range.clone(), self, true)
1738            {
1739                diagnostic_endpoints.push(DiagnosticEndpoint {
1740                    offset: entry.range.start,
1741                    is_start: true,
1742                    severity: entry.diagnostic.severity,
1743                });
1744                diagnostic_endpoints.push(DiagnosticEndpoint {
1745                    offset: entry.range.end,
1746                    is_start: false,
1747                    severity: entry.diagnostic.severity,
1748                });
1749            }
1750            diagnostic_endpoints
1751                .sort_unstable_by_key(|endpoint| (endpoint.offset, !endpoint.is_start));
1752
1753            if let Some((grammar, tree)) = self.grammar().zip(self.tree.as_ref()) {
1754                let mut query_cursor = QueryCursorHandle::new();
1755
1756                // TODO - add a Tree-sitter API to remove the need for this.
1757                let cursor = unsafe {
1758                    std::mem::transmute::<_, &'static mut QueryCursor>(query_cursor.deref_mut())
1759                };
1760                let captures = cursor.set_byte_range(range.clone()).captures(
1761                    &grammar.highlights_query,
1762                    tree.root_node(),
1763                    TextProvider(self.text.as_rope()),
1764                );
1765                highlights = Some(BufferChunkHighlights {
1766                    captures,
1767                    next_capture: None,
1768                    stack: Default::default(),
1769                    highlight_map: grammar.highlight_map(),
1770                    _query_cursor: query_cursor,
1771                    theme,
1772                })
1773            }
1774        }
1775
1776        let diagnostic_endpoints = diagnostic_endpoints.into_iter().peekable();
1777        let chunks = self.text.as_rope().chunks_in_range(range.clone());
1778
1779        BufferChunks {
1780            range,
1781            chunks,
1782            diagnostic_endpoints,
1783            error_depth: 0,
1784            warning_depth: 0,
1785            information_depth: 0,
1786            hint_depth: 0,
1787            highlights,
1788        }
1789    }
1790
1791    pub fn language(&self) -> Option<&Arc<Language>> {
1792        self.language.as_ref()
1793    }
1794
1795    fn grammar(&self) -> Option<&Arc<Grammar>> {
1796        self.language
1797            .as_ref()
1798            .and_then(|language| language.grammar.as_ref())
1799    }
1800
1801    pub fn range_for_syntax_ancestor<T: ToOffset>(&self, range: Range<T>) -> Option<Range<usize>> {
1802        if let Some(tree) = self.tree.as_ref() {
1803            let root = tree.root_node();
1804            let range = range.start.to_offset(self)..range.end.to_offset(self);
1805            let mut node = root.descendant_for_byte_range(range.start, range.end);
1806            while node.map_or(false, |n| n.byte_range() == range) {
1807                node = node.unwrap().parent();
1808            }
1809            node.map(|n| n.byte_range())
1810        } else {
1811            None
1812        }
1813    }
1814
1815    pub fn enclosing_bracket_ranges<T: ToOffset>(
1816        &self,
1817        range: Range<T>,
1818    ) -> Option<(Range<usize>, Range<usize>)> {
1819        let (grammar, tree) = self.grammar().zip(self.tree.as_ref())?;
1820        let open_capture_ix = grammar.brackets_query.capture_index_for_name("open")?;
1821        let close_capture_ix = grammar.brackets_query.capture_index_for_name("close")?;
1822
1823        // Find bracket pairs that *inclusively* contain the given range.
1824        let range = range.start.to_offset(self).saturating_sub(1)..range.end.to_offset(self) + 1;
1825        let mut cursor = QueryCursorHandle::new();
1826        let matches = cursor.set_byte_range(range).matches(
1827            &grammar.brackets_query,
1828            tree.root_node(),
1829            TextProvider(self.as_rope()),
1830        );
1831
1832        // Get the ranges of the innermost pair of brackets.
1833        matches
1834            .filter_map(|mat| {
1835                let open = mat.nodes_for_capture_index(open_capture_ix).next()?;
1836                let close = mat.nodes_for_capture_index(close_capture_ix).next()?;
1837                Some((open.byte_range(), close.byte_range()))
1838            })
1839            .min_by_key(|(open_range, close_range)| close_range.end - open_range.start)
1840    }
1841
1842    pub fn remote_selections_in_range<'a>(
1843        &'a self,
1844        range: Range<Anchor>,
1845    ) -> impl 'a + Iterator<Item = (ReplicaId, impl 'a + Iterator<Item = &'a Selection<Anchor>>)>
1846    {
1847        self.remote_selections
1848            .iter()
1849            .filter(|(replica_id, _)| **replica_id != self.text.replica_id())
1850            .map(move |(replica_id, selections)| {
1851                let start_ix = match selections
1852                    .binary_search_by(|probe| probe.end.cmp(&range.start, self).unwrap())
1853                {
1854                    Ok(ix) | Err(ix) => ix,
1855                };
1856                let end_ix = match selections
1857                    .binary_search_by(|probe| probe.start.cmp(&range.end, self).unwrap())
1858                {
1859                    Ok(ix) | Err(ix) => ix,
1860                };
1861
1862                (*replica_id, selections[start_ix..end_ix].iter())
1863            })
1864    }
1865
1866    pub fn diagnostics_in_range<'a, T, O>(
1867        &'a self,
1868        search_range: Range<T>,
1869    ) -> impl 'a + Iterator<Item = DiagnosticEntry<O>>
1870    where
1871        T: 'a + ToOffset,
1872        O: 'a + FromAnchor,
1873    {
1874        self.diagnostics.range(search_range, self, true)
1875    }
1876
1877    pub fn diagnostic_groups<O>(&self) -> Vec<DiagnosticGroup<O>>
1878    where
1879        O: FromAnchor + Ord + Copy,
1880    {
1881        self.diagnostics.groups(self)
1882    }
1883
1884    pub fn diagnostic_group<'a, O>(
1885        &'a self,
1886        group_id: usize,
1887    ) -> impl 'a + Iterator<Item = DiagnosticEntry<O>>
1888    where
1889        O: 'a + FromAnchor,
1890    {
1891        self.diagnostics.group(group_id, self)
1892    }
1893
1894    pub fn diagnostics_update_count(&self) -> usize {
1895        self.diagnostics_update_count
1896    }
1897
1898    pub fn parse_count(&self) -> usize {
1899        self.parse_count
1900    }
1901}
1902
1903impl Clone for BufferSnapshot {
1904    fn clone(&self) -> Self {
1905        Self {
1906            text: self.text.clone(),
1907            tree: self.tree.clone(),
1908            remote_selections: self.remote_selections.clone(),
1909            diagnostics: self.diagnostics.clone(),
1910            diagnostics_update_count: self.diagnostics_update_count,
1911            is_parsing: self.is_parsing,
1912            language: self.language.clone(),
1913            parse_count: self.parse_count,
1914        }
1915    }
1916}
1917
1918impl Deref for BufferSnapshot {
1919    type Target = text::BufferSnapshot;
1920
1921    fn deref(&self) -> &Self::Target {
1922        &self.text
1923    }
1924}
1925
1926impl<'a> tree_sitter::TextProvider<'a> for TextProvider<'a> {
1927    type I = ByteChunks<'a>;
1928
1929    fn text(&mut self, node: tree_sitter::Node) -> Self::I {
1930        ByteChunks(self.0.chunks_in_range(node.byte_range()))
1931    }
1932}
1933
1934struct ByteChunks<'a>(rope::Chunks<'a>);
1935
1936impl<'a> Iterator for ByteChunks<'a> {
1937    type Item = &'a [u8];
1938
1939    fn next(&mut self) -> Option<Self::Item> {
1940        self.0.next().map(str::as_bytes)
1941    }
1942}
1943
1944unsafe impl<'a> Send for BufferChunks<'a> {}
1945
1946impl<'a> BufferChunks<'a> {
1947    pub fn seek(&mut self, offset: usize) {
1948        self.range.start = offset;
1949        self.chunks.seek(self.range.start);
1950        if let Some(highlights) = self.highlights.as_mut() {
1951            highlights
1952                .stack
1953                .retain(|(end_offset, _)| *end_offset > offset);
1954            if let Some((mat, capture_ix)) = &highlights.next_capture {
1955                let capture = mat.captures[*capture_ix as usize];
1956                if offset >= capture.node.start_byte() {
1957                    let next_capture_end = capture.node.end_byte();
1958                    if offset < next_capture_end {
1959                        highlights.stack.push((
1960                            next_capture_end,
1961                            highlights.highlight_map.get(capture.index),
1962                        ));
1963                    }
1964                    highlights.next_capture.take();
1965                }
1966            }
1967            highlights.captures.set_byte_range(self.range.clone());
1968        }
1969    }
1970
1971    pub fn offset(&self) -> usize {
1972        self.range.start
1973    }
1974
1975    fn update_diagnostic_depths(&mut self, endpoint: DiagnosticEndpoint) {
1976        let depth = match endpoint.severity {
1977            DiagnosticSeverity::ERROR => &mut self.error_depth,
1978            DiagnosticSeverity::WARNING => &mut self.warning_depth,
1979            DiagnosticSeverity::INFORMATION => &mut self.information_depth,
1980            DiagnosticSeverity::HINT => &mut self.hint_depth,
1981            _ => return,
1982        };
1983        if endpoint.is_start {
1984            *depth += 1;
1985        } else {
1986            *depth -= 1;
1987        }
1988    }
1989
1990    fn current_diagnostic_severity(&mut self) -> Option<DiagnosticSeverity> {
1991        if self.error_depth > 0 {
1992            Some(DiagnosticSeverity::ERROR)
1993        } else if self.warning_depth > 0 {
1994            Some(DiagnosticSeverity::WARNING)
1995        } else if self.information_depth > 0 {
1996            Some(DiagnosticSeverity::INFORMATION)
1997        } else if self.hint_depth > 0 {
1998            Some(DiagnosticSeverity::HINT)
1999        } else {
2000            None
2001        }
2002    }
2003}
2004
2005impl<'a> Iterator for BufferChunks<'a> {
2006    type Item = Chunk<'a>;
2007
2008    fn next(&mut self) -> Option<Self::Item> {
2009        let mut next_capture_start = usize::MAX;
2010        let mut next_diagnostic_endpoint = usize::MAX;
2011
2012        if let Some(highlights) = self.highlights.as_mut() {
2013            while let Some((parent_capture_end, _)) = highlights.stack.last() {
2014                if *parent_capture_end <= self.range.start {
2015                    highlights.stack.pop();
2016                } else {
2017                    break;
2018                }
2019            }
2020
2021            if highlights.next_capture.is_none() {
2022                highlights.next_capture = highlights.captures.next();
2023            }
2024
2025            while let Some((mat, capture_ix)) = highlights.next_capture.as_ref() {
2026                let capture = mat.captures[*capture_ix as usize];
2027                if self.range.start < capture.node.start_byte() {
2028                    next_capture_start = capture.node.start_byte();
2029                    break;
2030                } else {
2031                    let highlight_id = highlights.highlight_map.get(capture.index);
2032                    highlights
2033                        .stack
2034                        .push((capture.node.end_byte(), highlight_id));
2035                    highlights.next_capture = highlights.captures.next();
2036                }
2037            }
2038        }
2039
2040        while let Some(endpoint) = self.diagnostic_endpoints.peek().copied() {
2041            if endpoint.offset <= self.range.start {
2042                self.update_diagnostic_depths(endpoint);
2043                self.diagnostic_endpoints.next();
2044            } else {
2045                next_diagnostic_endpoint = endpoint.offset;
2046                break;
2047            }
2048        }
2049
2050        if let Some(chunk) = self.chunks.peek() {
2051            let chunk_start = self.range.start;
2052            let mut chunk_end = (self.chunks.offset() + chunk.len())
2053                .min(next_capture_start)
2054                .min(next_diagnostic_endpoint);
2055            let mut highlight_style = None;
2056            if let Some(highlights) = self.highlights.as_ref() {
2057                if let Some((parent_capture_end, parent_highlight_id)) = highlights.stack.last() {
2058                    chunk_end = chunk_end.min(*parent_capture_end);
2059                    highlight_style = parent_highlight_id.style(highlights.theme);
2060                }
2061            }
2062
2063            let slice =
2064                &chunk[chunk_start - self.chunks.offset()..chunk_end - self.chunks.offset()];
2065            self.range.start = chunk_end;
2066            if self.range.start == self.chunks.offset() + chunk.len() {
2067                self.chunks.next().unwrap();
2068            }
2069
2070            Some(Chunk {
2071                text: slice,
2072                highlight_style,
2073                diagnostic: self.current_diagnostic_severity(),
2074            })
2075        } else {
2076            None
2077        }
2078    }
2079}
2080
2081impl QueryCursorHandle {
2082    fn new() -> Self {
2083        QueryCursorHandle(Some(
2084            QUERY_CURSORS
2085                .lock()
2086                .pop()
2087                .unwrap_or_else(|| QueryCursor::new()),
2088        ))
2089    }
2090}
2091
2092impl Deref for QueryCursorHandle {
2093    type Target = QueryCursor;
2094
2095    fn deref(&self) -> &Self::Target {
2096        self.0.as_ref().unwrap()
2097    }
2098}
2099
2100impl DerefMut for QueryCursorHandle {
2101    fn deref_mut(&mut self) -> &mut Self::Target {
2102        self.0.as_mut().unwrap()
2103    }
2104}
2105
2106impl Drop for QueryCursorHandle {
2107    fn drop(&mut self) {
2108        let mut cursor = self.0.take().unwrap();
2109        cursor.set_byte_range(0..usize::MAX);
2110        cursor.set_point_range(Point::zero().to_ts_point()..Point::MAX.to_ts_point());
2111        QUERY_CURSORS.lock().push(cursor)
2112    }
2113}
2114
2115trait ToTreeSitterPoint {
2116    fn to_ts_point(self) -> tree_sitter::Point;
2117    fn from_ts_point(point: tree_sitter::Point) -> Self;
2118}
2119
2120impl ToTreeSitterPoint for Point {
2121    fn to_ts_point(self) -> tree_sitter::Point {
2122        tree_sitter::Point::new(self.row as usize, self.column as usize)
2123    }
2124
2125    fn from_ts_point(point: tree_sitter::Point) -> Self {
2126        Point::new(point.row as u32, point.column as u32)
2127    }
2128}
2129
2130impl operation_queue::Operation for Operation {
2131    fn lamport_timestamp(&self) -> clock::Lamport {
2132        match self {
2133            Operation::Buffer(_) => {
2134                unreachable!("buffer operations should never be deferred at this layer")
2135            }
2136            Operation::UpdateDiagnostics {
2137                lamport_timestamp, ..
2138            }
2139            | Operation::UpdateSelections {
2140                lamport_timestamp, ..
2141            }
2142            | Operation::RemoveSelections {
2143                lamport_timestamp, ..
2144            } => *lamport_timestamp,
2145        }
2146    }
2147}
2148
2149impl Default for Diagnostic {
2150    fn default() -> Self {
2151        Self {
2152            source: Default::default(),
2153            code: Default::default(),
2154            severity: DiagnosticSeverity::ERROR,
2155            message: Default::default(),
2156            group_id: Default::default(),
2157            is_primary: Default::default(),
2158            is_valid: true,
2159        }
2160    }
2161}
2162
2163pub fn contiguous_ranges(
2164    values: impl Iterator<Item = u32>,
2165    max_len: usize,
2166) -> impl Iterator<Item = Range<u32>> {
2167    let mut values = values.into_iter();
2168    let mut current_range: Option<Range<u32>> = None;
2169    std::iter::from_fn(move || loop {
2170        if let Some(value) = values.next() {
2171            if let Some(range) = &mut current_range {
2172                if value == range.end && range.len() < max_len {
2173                    range.end += 1;
2174                    continue;
2175                }
2176            }
2177
2178            let prev_range = current_range.clone();
2179            current_range = Some(value..(value + 1));
2180            if prev_range.is_some() {
2181                return prev_range;
2182            }
2183        } else {
2184            return current_range.take();
2185        }
2186    })
2187}