1pub mod display_map;
   2mod element;
   3pub mod items;
   4pub mod movement;
   5
   6#[cfg(test)]
   7mod test;
   8
   9use aho_corasick::AhoCorasick;
  10use clock::ReplicaId;
  11pub use display_map::DisplayPoint;
  12use display_map::*;
  13pub use element::*;
  14use gpui::{
  15    action,
  16    elements::Text,
  17    geometry::vector::{vec2f, Vector2F},
  18    keymap::Binding,
  19    text_layout, AppContext, ClipboardItem, Element, ElementBox, Entity, ModelHandle,
  20    MutableAppContext, RenderContext, View, ViewContext, WeakViewHandle,
  21};
  22use items::BufferItemHandle;
  23use language::*;
  24use serde::{Deserialize, Serialize};
  25use smallvec::SmallVec;
  26use smol::Timer;
  27use std::{
  28    cell::RefCell,
  29    cmp,
  30    collections::HashMap,
  31    iter, mem,
  32    ops::{Deref, Range, RangeInclusive},
  33    rc::Rc,
  34    sync::Arc,
  35    time::Duration,
  36};
  37use sum_tree::Bias;
  38use text::rope::TextDimension;
  39use theme::{DiagnosticStyle, EditorStyle};
  40use util::post_inc;
  41use workspace::{EntryOpener, Workspace};
  42
  43const CURSOR_BLINK_INTERVAL: Duration = Duration::from_millis(500);
  44const MAX_LINE_LEN: usize = 1024;
  45
  46action!(Cancel);
  47action!(Backspace);
  48action!(Delete);
  49action!(Input, String);
  50action!(Newline);
  51action!(Tab);
  52action!(Outdent);
  53action!(DeleteLine);
  54action!(DeleteToPreviousWordBoundary);
  55action!(DeleteToNextWordBoundary);
  56action!(DeleteToBeginningOfLine);
  57action!(DeleteToEndOfLine);
  58action!(CutToEndOfLine);
  59action!(DuplicateLine);
  60action!(MoveLineUp);
  61action!(MoveLineDown);
  62action!(Cut);
  63action!(Copy);
  64action!(Paste);
  65action!(Undo);
  66action!(Redo);
  67action!(MoveUp);
  68action!(MoveDown);
  69action!(MoveLeft);
  70action!(MoveRight);
  71action!(MoveToPreviousWordBoundary);
  72action!(MoveToNextWordBoundary);
  73action!(MoveToBeginningOfLine);
  74action!(MoveToEndOfLine);
  75action!(MoveToBeginning);
  76action!(MoveToEnd);
  77action!(SelectUp);
  78action!(SelectDown);
  79action!(SelectLeft);
  80action!(SelectRight);
  81action!(SelectToPreviousWordBoundary);
  82action!(SelectToNextWordBoundary);
  83action!(SelectToBeginningOfLine, bool);
  84action!(SelectToEndOfLine);
  85action!(SelectToBeginning);
  86action!(SelectToEnd);
  87action!(SelectAll);
  88action!(SelectLine);
  89action!(SplitSelectionIntoLines);
  90action!(AddSelectionAbove);
  91action!(AddSelectionBelow);
  92action!(SelectNext, bool);
  93action!(ToggleComments);
  94action!(SelectLargerSyntaxNode);
  95action!(SelectSmallerSyntaxNode);
  96action!(MoveToEnclosingBracket);
  97action!(ShowNextDiagnostic);
  98action!(PageUp);
  99action!(PageDown);
 100action!(Fold);
 101action!(Unfold);
 102action!(FoldSelectedRanges);
 103action!(Scroll, Vector2F);
 104action!(Select, SelectPhase);
 105
 106pub fn init(cx: &mut MutableAppContext, entry_openers: &mut Vec<Box<dyn EntryOpener>>) {
 107    entry_openers.push(Box::new(items::BufferOpener));
 108    cx.add_bindings(vec![
 109        Binding::new("escape", Cancel, Some("Editor")),
 110        Binding::new("backspace", Backspace, Some("Editor")),
 111        Binding::new("ctrl-h", Backspace, Some("Editor")),
 112        Binding::new("delete", Delete, Some("Editor")),
 113        Binding::new("ctrl-d", Delete, Some("Editor")),
 114        Binding::new("enter", Newline, Some("Editor && mode == full")),
 115        Binding::new(
 116            "alt-enter",
 117            Input("\n".into()),
 118            Some("Editor && mode == auto_height"),
 119        ),
 120        Binding::new("tab", Tab, Some("Editor")),
 121        Binding::new("shift-tab", Outdent, Some("Editor")),
 122        Binding::new("ctrl-shift-K", DeleteLine, Some("Editor")),
 123        Binding::new(
 124            "alt-backspace",
 125            DeleteToPreviousWordBoundary,
 126            Some("Editor"),
 127        ),
 128        Binding::new("alt-h", DeleteToPreviousWordBoundary, Some("Editor")),
 129        Binding::new("alt-delete", DeleteToNextWordBoundary, Some("Editor")),
 130        Binding::new("alt-d", DeleteToNextWordBoundary, Some("Editor")),
 131        Binding::new("cmd-backspace", DeleteToBeginningOfLine, Some("Editor")),
 132        Binding::new("cmd-delete", DeleteToEndOfLine, Some("Editor")),
 133        Binding::new("ctrl-k", CutToEndOfLine, Some("Editor")),
 134        Binding::new("cmd-shift-D", DuplicateLine, Some("Editor")),
 135        Binding::new("ctrl-cmd-up", MoveLineUp, Some("Editor")),
 136        Binding::new("ctrl-cmd-down", MoveLineDown, Some("Editor")),
 137        Binding::new("cmd-x", Cut, Some("Editor")),
 138        Binding::new("cmd-c", Copy, Some("Editor")),
 139        Binding::new("cmd-v", Paste, Some("Editor")),
 140        Binding::new("cmd-z", Undo, Some("Editor")),
 141        Binding::new("cmd-shift-Z", Redo, Some("Editor")),
 142        Binding::new("up", MoveUp, Some("Editor")),
 143        Binding::new("down", MoveDown, Some("Editor")),
 144        Binding::new("left", MoveLeft, Some("Editor")),
 145        Binding::new("right", MoveRight, Some("Editor")),
 146        Binding::new("ctrl-p", MoveUp, Some("Editor")),
 147        Binding::new("ctrl-n", MoveDown, Some("Editor")),
 148        Binding::new("ctrl-b", MoveLeft, Some("Editor")),
 149        Binding::new("ctrl-f", MoveRight, Some("Editor")),
 150        Binding::new("alt-left", MoveToPreviousWordBoundary, Some("Editor")),
 151        Binding::new("alt-b", MoveToPreviousWordBoundary, Some("Editor")),
 152        Binding::new("alt-right", MoveToNextWordBoundary, Some("Editor")),
 153        Binding::new("alt-f", MoveToNextWordBoundary, Some("Editor")),
 154        Binding::new("cmd-left", MoveToBeginningOfLine, Some("Editor")),
 155        Binding::new("ctrl-a", MoveToBeginningOfLine, Some("Editor")),
 156        Binding::new("cmd-right", MoveToEndOfLine, Some("Editor")),
 157        Binding::new("ctrl-e", MoveToEndOfLine, Some("Editor")),
 158        Binding::new("cmd-up", MoveToBeginning, Some("Editor")),
 159        Binding::new("cmd-down", MoveToEnd, Some("Editor")),
 160        Binding::new("shift-up", SelectUp, Some("Editor")),
 161        Binding::new("ctrl-shift-P", SelectUp, Some("Editor")),
 162        Binding::new("shift-down", SelectDown, Some("Editor")),
 163        Binding::new("ctrl-shift-N", SelectDown, Some("Editor")),
 164        Binding::new("shift-left", SelectLeft, Some("Editor")),
 165        Binding::new("ctrl-shift-B", SelectLeft, Some("Editor")),
 166        Binding::new("shift-right", SelectRight, Some("Editor")),
 167        Binding::new("ctrl-shift-F", SelectRight, Some("Editor")),
 168        Binding::new(
 169            "alt-shift-left",
 170            SelectToPreviousWordBoundary,
 171            Some("Editor"),
 172        ),
 173        Binding::new("alt-shift-B", SelectToPreviousWordBoundary, Some("Editor")),
 174        Binding::new("alt-shift-right", SelectToNextWordBoundary, Some("Editor")),
 175        Binding::new("alt-shift-F", SelectToNextWordBoundary, Some("Editor")),
 176        Binding::new(
 177            "cmd-shift-left",
 178            SelectToBeginningOfLine(true),
 179            Some("Editor"),
 180        ),
 181        Binding::new(
 182            "ctrl-shift-A",
 183            SelectToBeginningOfLine(true),
 184            Some("Editor"),
 185        ),
 186        Binding::new("cmd-shift-right", SelectToEndOfLine, Some("Editor")),
 187        Binding::new("ctrl-shift-E", SelectToEndOfLine, Some("Editor")),
 188        Binding::new("cmd-shift-up", SelectToBeginning, Some("Editor")),
 189        Binding::new("cmd-shift-down", SelectToEnd, Some("Editor")),
 190        Binding::new("cmd-a", SelectAll, Some("Editor")),
 191        Binding::new("cmd-l", SelectLine, Some("Editor")),
 192        Binding::new("cmd-shift-L", SplitSelectionIntoLines, Some("Editor")),
 193        Binding::new("cmd-alt-up", AddSelectionAbove, Some("Editor")),
 194        Binding::new("cmd-ctrl-p", AddSelectionAbove, Some("Editor")),
 195        Binding::new("cmd-alt-down", AddSelectionBelow, Some("Editor")),
 196        Binding::new("cmd-ctrl-n", AddSelectionBelow, Some("Editor")),
 197        Binding::new("cmd-d", SelectNext(false), Some("Editor")),
 198        Binding::new("cmd-k cmd-d", SelectNext(true), Some("Editor")),
 199        Binding::new("cmd-/", ToggleComments, Some("Editor")),
 200        Binding::new("alt-up", SelectLargerSyntaxNode, Some("Editor")),
 201        Binding::new("ctrl-w", SelectLargerSyntaxNode, Some("Editor")),
 202        Binding::new("alt-down", SelectSmallerSyntaxNode, Some("Editor")),
 203        Binding::new("ctrl-shift-W", SelectSmallerSyntaxNode, Some("Editor")),
 204        Binding::new("f8", ShowNextDiagnostic, Some("Editor")),
 205        Binding::new("ctrl-m", MoveToEnclosingBracket, Some("Editor")),
 206        Binding::new("pageup", PageUp, Some("Editor")),
 207        Binding::new("pagedown", PageDown, Some("Editor")),
 208        Binding::new("alt-cmd-[", Fold, Some("Editor")),
 209        Binding::new("alt-cmd-]", Unfold, Some("Editor")),
 210        Binding::new("alt-cmd-f", FoldSelectedRanges, Some("Editor")),
 211    ]);
 212
 213    cx.add_action(Editor::open_new);
 214    cx.add_action(|this: &mut Editor, action: &Scroll, cx| this.set_scroll_position(action.0, cx));
 215    cx.add_action(Editor::select);
 216    cx.add_action(Editor::cancel);
 217    cx.add_action(Editor::handle_input);
 218    cx.add_action(Editor::newline);
 219    cx.add_action(Editor::backspace);
 220    cx.add_action(Editor::delete);
 221    cx.add_action(Editor::tab);
 222    cx.add_action(Editor::outdent);
 223    cx.add_action(Editor::delete_line);
 224    cx.add_action(Editor::delete_to_previous_word_boundary);
 225    cx.add_action(Editor::delete_to_next_word_boundary);
 226    cx.add_action(Editor::delete_to_beginning_of_line);
 227    cx.add_action(Editor::delete_to_end_of_line);
 228    cx.add_action(Editor::cut_to_end_of_line);
 229    cx.add_action(Editor::duplicate_line);
 230    cx.add_action(Editor::move_line_up);
 231    cx.add_action(Editor::move_line_down);
 232    cx.add_action(Editor::cut);
 233    cx.add_action(Editor::copy);
 234    cx.add_action(Editor::paste);
 235    cx.add_action(Editor::undo);
 236    cx.add_action(Editor::redo);
 237    cx.add_action(Editor::move_up);
 238    cx.add_action(Editor::move_down);
 239    cx.add_action(Editor::move_left);
 240    cx.add_action(Editor::move_right);
 241    cx.add_action(Editor::move_to_previous_word_boundary);
 242    cx.add_action(Editor::move_to_next_word_boundary);
 243    cx.add_action(Editor::move_to_beginning_of_line);
 244    cx.add_action(Editor::move_to_end_of_line);
 245    cx.add_action(Editor::move_to_beginning);
 246    cx.add_action(Editor::move_to_end);
 247    cx.add_action(Editor::select_up);
 248    cx.add_action(Editor::select_down);
 249    cx.add_action(Editor::select_left);
 250    cx.add_action(Editor::select_right);
 251    cx.add_action(Editor::select_to_previous_word_boundary);
 252    cx.add_action(Editor::select_to_next_word_boundary);
 253    cx.add_action(Editor::select_to_beginning_of_line);
 254    cx.add_action(Editor::select_to_end_of_line);
 255    cx.add_action(Editor::select_to_beginning);
 256    cx.add_action(Editor::select_to_end);
 257    cx.add_action(Editor::select_all);
 258    cx.add_action(Editor::select_line);
 259    cx.add_action(Editor::split_selection_into_lines);
 260    cx.add_action(Editor::add_selection_above);
 261    cx.add_action(Editor::add_selection_below);
 262    cx.add_action(Editor::select_next);
 263    cx.add_action(Editor::toggle_comments);
 264    cx.add_action(Editor::select_larger_syntax_node);
 265    cx.add_action(Editor::select_smaller_syntax_node);
 266    cx.add_action(Editor::move_to_enclosing_bracket);
 267    cx.add_action(Editor::show_next_diagnostic);
 268    cx.add_action(Editor::page_up);
 269    cx.add_action(Editor::page_down);
 270    cx.add_action(Editor::fold);
 271    cx.add_action(Editor::unfold);
 272    cx.add_action(Editor::fold_selected_ranges);
 273}
 274
 275trait SelectionExt {
 276    fn display_range(&self, map: &DisplayMapSnapshot) -> Range<DisplayPoint>;
 277    fn spanned_rows(
 278        &self,
 279        include_end_if_at_line_start: bool,
 280        map: &DisplayMapSnapshot,
 281    ) -> SpannedRows;
 282}
 283
 284struct SpannedRows {
 285    buffer_rows: Range<u32>,
 286    display_rows: Range<u32>,
 287}
 288
 289#[derive(Clone, Debug)]
 290pub enum SelectPhase {
 291    Begin {
 292        position: DisplayPoint,
 293        add: bool,
 294        click_count: usize,
 295    },
 296    BeginColumnar {
 297        position: DisplayPoint,
 298        overshoot: u32,
 299    },
 300    Extend {
 301        position: DisplayPoint,
 302        click_count: usize,
 303    },
 304    Update {
 305        position: DisplayPoint,
 306        overshoot: u32,
 307        scroll_position: Vector2F,
 308    },
 309    End,
 310}
 311
 312#[derive(Clone, Debug)]
 313enum SelectMode {
 314    Character,
 315    Word(Range<Anchor>),
 316    Line(Range<Anchor>),
 317    All,
 318}
 319
 320#[derive(PartialEq, Eq)]
 321pub enum Autoscroll {
 322    Fit,
 323    Center,
 324    Newest,
 325}
 326
 327#[derive(Copy, Clone, PartialEq, Eq)]
 328pub enum EditorMode {
 329    SingleLine,
 330    AutoHeight { max_lines: usize },
 331    Full,
 332}
 333
 334#[derive(Clone)]
 335pub struct EditorSettings {
 336    pub tab_size: usize,
 337    pub soft_wrap: SoftWrap,
 338    pub style: EditorStyle,
 339}
 340
 341#[derive(Clone)]
 342pub enum SoftWrap {
 343    None,
 344    EditorWidth,
 345    Column(u32),
 346}
 347
 348pub struct Editor {
 349    handle: WeakViewHandle<Self>,
 350    buffer: ModelHandle<Buffer>,
 351    display_map: ModelHandle<DisplayMap>,
 352    selection_set_id: SelectionSetId,
 353    pending_selection: Option<PendingSelection>,
 354    columnar_selection_tail: Option<Anchor>,
 355    next_selection_id: usize,
 356    add_selections_state: Option<AddSelectionsState>,
 357    select_next_state: Option<SelectNextState>,
 358    autoclose_stack: Vec<BracketPairState>,
 359    select_larger_syntax_node_stack: Vec<Box<[Selection<usize>]>>,
 360    active_diagnostics: Option<ActiveDiagnosticGroup>,
 361    scroll_position: Vector2F,
 362    scroll_top_anchor: Anchor,
 363    autoscroll_request: Option<Autoscroll>,
 364    build_settings: Rc<RefCell<dyn Fn(&AppContext) -> EditorSettings>>,
 365    focused: bool,
 366    show_local_cursors: bool,
 367    blink_epoch: usize,
 368    blinking_paused: bool,
 369    mode: EditorMode,
 370    placeholder_text: Option<Arc<str>>,
 371    highlighted_row: Option<u32>,
 372}
 373
 374pub struct Snapshot {
 375    pub mode: EditorMode,
 376    pub display_snapshot: DisplayMapSnapshot,
 377    pub placeholder_text: Option<Arc<str>>,
 378    is_focused: bool,
 379    scroll_position: Vector2F,
 380    scroll_top_anchor: Anchor,
 381}
 382
 383struct PendingSelection {
 384    selection: Selection<Anchor>,
 385    mode: SelectMode,
 386}
 387
 388struct AddSelectionsState {
 389    above: bool,
 390    stack: Vec<usize>,
 391}
 392
 393struct SelectNextState {
 394    query: AhoCorasick,
 395    wordwise: bool,
 396    done: bool,
 397}
 398
 399#[derive(Debug)]
 400struct BracketPairState {
 401    ranges: Vec<Range<Anchor>>,
 402    pair: BracketPair,
 403}
 404
 405#[derive(Debug)]
 406struct ActiveDiagnosticGroup {
 407    primary_range: Range<Anchor>,
 408    primary_message: String,
 409    blocks: HashMap<BlockId, Diagnostic>,
 410    is_valid: bool,
 411}
 412
 413#[derive(Serialize, Deserialize)]
 414struct ClipboardSelection {
 415    len: usize,
 416    is_entire_line: bool,
 417}
 418
 419impl Editor {
 420    pub fn single_line(
 421        build_settings: impl 'static + Fn(&AppContext) -> EditorSettings,
 422        cx: &mut ViewContext<Self>,
 423    ) -> Self {
 424        let buffer = cx.add_model(|cx| Buffer::new(0, String::new(), cx));
 425        let mut view = Self::for_buffer(buffer, build_settings, cx);
 426        view.mode = EditorMode::SingleLine;
 427        view
 428    }
 429
 430    pub fn auto_height(
 431        max_lines: usize,
 432        build_settings: impl 'static + Fn(&AppContext) -> EditorSettings,
 433        cx: &mut ViewContext<Self>,
 434    ) -> Self {
 435        let buffer = cx.add_model(|cx| Buffer::new(0, String::new(), cx));
 436        let mut view = Self::for_buffer(buffer, build_settings, cx);
 437        view.mode = EditorMode::AutoHeight { max_lines };
 438        view
 439    }
 440
 441    pub fn for_buffer(
 442        buffer: ModelHandle<Buffer>,
 443        build_settings: impl 'static + Fn(&AppContext) -> EditorSettings,
 444        cx: &mut ViewContext<Self>,
 445    ) -> Self {
 446        Self::new(buffer, Rc::new(RefCell::new(build_settings)), cx)
 447    }
 448
 449    pub fn clone(&self, cx: &mut ViewContext<Self>) -> Self {
 450        let mut clone = Self::new(self.buffer.clone(), self.build_settings.clone(), cx);
 451        clone.scroll_position = self.scroll_position;
 452        clone.scroll_top_anchor = self.scroll_top_anchor.clone();
 453        clone
 454    }
 455
 456    pub fn new(
 457        buffer: ModelHandle<Buffer>,
 458        build_settings: Rc<RefCell<dyn Fn(&AppContext) -> EditorSettings>>,
 459        cx: &mut ViewContext<Self>,
 460    ) -> Self {
 461        let settings = build_settings.borrow_mut()(cx);
 462        let display_map = cx.add_model(|cx| {
 463            DisplayMap::new(
 464                buffer.clone(),
 465                settings.tab_size,
 466                settings.style.text.font_id,
 467                settings.style.text.font_size,
 468                None,
 469                cx,
 470            )
 471        });
 472        cx.observe(&buffer, Self::on_buffer_changed).detach();
 473        cx.subscribe(&buffer, Self::on_buffer_event).detach();
 474        cx.observe(&display_map, Self::on_display_map_changed)
 475            .detach();
 476
 477        let mut next_selection_id = 0;
 478        let selection_set_id = buffer.update(cx, |buffer, cx| {
 479            buffer.add_selection_set(
 480                &[Selection {
 481                    id: post_inc(&mut next_selection_id),
 482                    start: 0,
 483                    end: 0,
 484                    reversed: false,
 485                    goal: SelectionGoal::None,
 486                }],
 487                cx,
 488            )
 489        });
 490        Self {
 491            handle: cx.weak_handle(),
 492            buffer,
 493            display_map,
 494            selection_set_id,
 495            pending_selection: None,
 496            columnar_selection_tail: None,
 497            next_selection_id,
 498            add_selections_state: None,
 499            select_next_state: None,
 500            autoclose_stack: Default::default(),
 501            select_larger_syntax_node_stack: Vec::new(),
 502            active_diagnostics: None,
 503            build_settings,
 504            scroll_position: Vector2F::zero(),
 505            scroll_top_anchor: Anchor::min(),
 506            autoscroll_request: None,
 507            focused: false,
 508            show_local_cursors: false,
 509            blink_epoch: 0,
 510            blinking_paused: false,
 511            mode: EditorMode::Full,
 512            placeholder_text: None,
 513            highlighted_row: None,
 514        }
 515    }
 516
 517    pub fn open_new(
 518        workspace: &mut Workspace,
 519        _: &workspace::OpenNew,
 520        cx: &mut ViewContext<Workspace>,
 521    ) {
 522        let buffer = cx.add_model(|cx| {
 523            Buffer::new(0, "", cx).with_language(Some(language::PLAIN_TEXT.clone()), None, cx)
 524        });
 525        workspace.add_item(BufferItemHandle(buffer), cx);
 526    }
 527
 528    pub fn replica_id(&self, cx: &AppContext) -> ReplicaId {
 529        self.buffer.read(cx).replica_id()
 530    }
 531
 532    pub fn buffer(&self) -> &ModelHandle<Buffer> {
 533        &self.buffer
 534    }
 535
 536    pub fn snapshot(&mut self, cx: &mut MutableAppContext) -> Snapshot {
 537        Snapshot {
 538            mode: self.mode,
 539            display_snapshot: self.display_map.update(cx, |map, cx| map.snapshot(cx)),
 540            scroll_position: self.scroll_position,
 541            scroll_top_anchor: self.scroll_top_anchor.clone(),
 542            placeholder_text: self.placeholder_text.clone(),
 543            is_focused: self
 544                .handle
 545                .upgrade(cx)
 546                .map_or(false, |handle| handle.is_focused(cx)),
 547        }
 548    }
 549
 550    pub fn language<'a>(&self, cx: &'a AppContext) -> Option<&'a Arc<Language>> {
 551        self.buffer.read(cx).language()
 552    }
 553
 554    pub fn set_placeholder_text(
 555        &mut self,
 556        placeholder_text: impl Into<Arc<str>>,
 557        cx: &mut ViewContext<Self>,
 558    ) {
 559        self.placeholder_text = Some(placeholder_text.into());
 560        cx.notify();
 561    }
 562
 563    pub fn set_scroll_position(&mut self, scroll_position: Vector2F, cx: &mut ViewContext<Self>) {
 564        let map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
 565        let scroll_top_buffer_offset =
 566            DisplayPoint::new(scroll_position.y() as u32, 0).to_offset(&map, Bias::Right);
 567        self.scroll_top_anchor = self
 568            .buffer
 569            .read(cx)
 570            .anchor_at(scroll_top_buffer_offset, Bias::Right);
 571        self.scroll_position = vec2f(
 572            scroll_position.x(),
 573            scroll_position.y() - self.scroll_top_anchor.to_display_point(&map).row() as f32,
 574        );
 575
 576        debug_assert_eq!(
 577            compute_scroll_position(&map, self.scroll_position, &self.scroll_top_anchor),
 578            scroll_position
 579        );
 580
 581        cx.notify();
 582    }
 583
 584    pub fn scroll_position(&self, cx: &mut ViewContext<Self>) -> Vector2F {
 585        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
 586        compute_scroll_position(&display_map, self.scroll_position, &self.scroll_top_anchor)
 587    }
 588
 589    pub fn clamp_scroll_left(&mut self, max: f32) -> bool {
 590        if max < self.scroll_position.x() {
 591            self.scroll_position.set_x(max);
 592            true
 593        } else {
 594            false
 595        }
 596    }
 597
 598    pub fn autoscroll_vertically(
 599        &mut self,
 600        viewport_height: f32,
 601        line_height: f32,
 602        cx: &mut ViewContext<Self>,
 603    ) -> bool {
 604        let visible_lines = viewport_height / line_height;
 605        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
 606        let mut scroll_position =
 607            compute_scroll_position(&display_map, self.scroll_position, &self.scroll_top_anchor);
 608        let max_scroll_top = if matches!(self.mode, EditorMode::AutoHeight { .. }) {
 609            (display_map.max_point().row() as f32 - visible_lines + 1.).max(0.)
 610        } else {
 611            display_map.max_point().row().saturating_sub(1) as f32
 612        };
 613        if scroll_position.y() > max_scroll_top {
 614            scroll_position.set_y(max_scroll_top);
 615            self.set_scroll_position(scroll_position, cx);
 616        }
 617
 618        let autoscroll = if let Some(autoscroll) = self.autoscroll_request.take() {
 619            autoscroll
 620        } else {
 621            return false;
 622        };
 623
 624        let first_cursor_top;
 625        let last_cursor_bottom;
 626        if autoscroll == Autoscroll::Newest {
 627            let newest_selection = self.newest_selection::<Point>(cx);
 628            first_cursor_top = newest_selection.head().to_display_point(&display_map).row() as f32;
 629            last_cursor_bottom = first_cursor_top + 1.;
 630        } else {
 631            let mut selections = self.selections::<Point>(cx).peekable();
 632            first_cursor_top = selections
 633                .peek()
 634                .unwrap()
 635                .head()
 636                .to_display_point(&display_map)
 637                .row() as f32;
 638            last_cursor_bottom = selections
 639                .last()
 640                .unwrap()
 641                .head()
 642                .to_display_point(&display_map)
 643                .row() as f32
 644                + 1.0;
 645        }
 646
 647        let margin = if matches!(self.mode, EditorMode::AutoHeight { .. }) {
 648            0.
 649        } else {
 650            ((visible_lines - (last_cursor_bottom - first_cursor_top)) / 2.0).floor()
 651        };
 652        if margin < 0.0 {
 653            return false;
 654        }
 655
 656        match autoscroll {
 657            Autoscroll::Fit | Autoscroll::Newest => {
 658                let margin = margin.min(3.0);
 659                let target_top = (first_cursor_top - margin).max(0.0);
 660                let target_bottom = last_cursor_bottom + margin;
 661                let start_row = scroll_position.y();
 662                let end_row = start_row + visible_lines;
 663
 664                if target_top < start_row {
 665                    scroll_position.set_y(target_top);
 666                    self.set_scroll_position(scroll_position, cx);
 667                } else if target_bottom >= end_row {
 668                    scroll_position.set_y(target_bottom - visible_lines);
 669                    self.set_scroll_position(scroll_position, cx);
 670                }
 671            }
 672            Autoscroll::Center => {
 673                scroll_position.set_y((first_cursor_top - margin).max(0.0));
 674                self.set_scroll_position(scroll_position, cx);
 675            }
 676        }
 677
 678        true
 679    }
 680
 681    pub fn autoscroll_horizontally(
 682        &mut self,
 683        start_row: u32,
 684        viewport_width: f32,
 685        scroll_width: f32,
 686        max_glyph_width: f32,
 687        layouts: &[text_layout::Line],
 688        cx: &mut ViewContext<Self>,
 689    ) -> bool {
 690        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
 691        let selections = self.selections::<Point>(cx);
 692        let mut target_left = std::f32::INFINITY;
 693        let mut target_right = 0.0_f32;
 694        for selection in selections {
 695            let head = selection.head().to_display_point(&display_map);
 696            if head.row() >= start_row && head.row() < start_row + layouts.len() as u32 {
 697                let start_column = head.column().saturating_sub(3);
 698                let end_column = cmp::min(display_map.line_len(head.row()), head.column() + 3);
 699                target_left = target_left.min(
 700                    layouts[(head.row() - start_row) as usize].x_for_index(start_column as usize),
 701                );
 702                target_right = target_right.max(
 703                    layouts[(head.row() - start_row) as usize].x_for_index(end_column as usize)
 704                        + max_glyph_width,
 705                );
 706            }
 707        }
 708        target_right = target_right.min(scroll_width);
 709
 710        if target_right - target_left > viewport_width {
 711            return false;
 712        }
 713
 714        let scroll_left = self.scroll_position.x() * max_glyph_width;
 715        let scroll_right = scroll_left + viewport_width;
 716
 717        if target_left < scroll_left {
 718            self.scroll_position.set_x(target_left / max_glyph_width);
 719            true
 720        } else if target_right > scroll_right {
 721            self.scroll_position
 722                .set_x((target_right - viewport_width) / max_glyph_width);
 723            true
 724        } else {
 725            false
 726        }
 727    }
 728
 729    fn select(&mut self, Select(phase): &Select, cx: &mut ViewContext<Self>) {
 730        match phase {
 731            SelectPhase::Begin {
 732                position,
 733                add,
 734                click_count,
 735            } => self.begin_selection(*position, *add, *click_count, cx),
 736            SelectPhase::BeginColumnar {
 737                position,
 738                overshoot,
 739            } => self.begin_columnar_selection(*position, *overshoot, cx),
 740            SelectPhase::Extend {
 741                position,
 742                click_count,
 743            } => self.extend_selection(*position, *click_count, cx),
 744            SelectPhase::Update {
 745                position,
 746                overshoot,
 747                scroll_position,
 748            } => self.update_selection(*position, *overshoot, *scroll_position, cx),
 749            SelectPhase::End => self.end_selection(cx),
 750        }
 751    }
 752
 753    fn extend_selection(
 754        &mut self,
 755        position: DisplayPoint,
 756        click_count: usize,
 757        cx: &mut ViewContext<Self>,
 758    ) {
 759        let tail = self.newest_selection::<usize>(cx).tail();
 760
 761        self.begin_selection(position, false, click_count, cx);
 762
 763        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
 764        let buffer = self.buffer.read(cx);
 765        let position = position.to_offset(&display_map, Bias::Left);
 766        let tail_anchor = buffer.anchor_before(tail);
 767        let pending = self.pending_selection.as_mut().unwrap();
 768
 769        if position >= tail {
 770            pending.selection.start = tail_anchor.clone();
 771        } else {
 772            pending.selection.end = tail_anchor.clone();
 773            pending.selection.reversed = true;
 774        }
 775
 776        match &mut pending.mode {
 777            SelectMode::Word(range) | SelectMode::Line(range) => {
 778                *range = tail_anchor.clone()..tail_anchor
 779            }
 780            _ => {}
 781        }
 782    }
 783
 784    fn begin_selection(
 785        &mut self,
 786        position: DisplayPoint,
 787        add: bool,
 788        click_count: usize,
 789        cx: &mut ViewContext<Self>,
 790    ) {
 791        if !self.focused {
 792            cx.focus_self();
 793            cx.emit(Event::Activate);
 794        }
 795
 796        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
 797        let buffer = self.buffer.read(cx);
 798        let start;
 799        let end;
 800        let mode;
 801        match click_count {
 802            1 => {
 803                start = buffer.anchor_before(position.to_point(&display_map));
 804                end = start.clone();
 805                mode = SelectMode::Character;
 806            }
 807            2 => {
 808                let range = movement::surrounding_word(&display_map, position);
 809                start = buffer.anchor_before(range.start.to_point(&display_map));
 810                end = buffer.anchor_before(range.end.to_point(&display_map));
 811                mode = SelectMode::Word(start.clone()..end.clone());
 812            }
 813            3 => {
 814                let position = display_map.clip_point(position, Bias::Left);
 815                let line_start = movement::line_beginning(&display_map, position, false);
 816                let mut next_line_start = line_start.clone();
 817                *next_line_start.row_mut() += 1;
 818                *next_line_start.column_mut() = 0;
 819                next_line_start = display_map.clip_point(next_line_start, Bias::Right);
 820
 821                start = buffer.anchor_before(line_start.to_point(&display_map));
 822                end = buffer.anchor_before(next_line_start.to_point(&display_map));
 823                mode = SelectMode::Line(start.clone()..end.clone());
 824            }
 825            _ => {
 826                start = buffer.anchor_before(0);
 827                end = buffer.anchor_before(buffer.len());
 828                mode = SelectMode::All;
 829            }
 830        }
 831
 832        let selection = Selection {
 833            id: post_inc(&mut self.next_selection_id),
 834            start,
 835            end,
 836            reversed: false,
 837            goal: SelectionGoal::None,
 838        };
 839
 840        if !add {
 841            self.update_selections::<usize>(Vec::new(), None, cx);
 842        } else if click_count > 1 {
 843            // Remove the newest selection since it was only added as part of this multi-click.
 844            let newest_selection = self.newest_selection::<usize>(cx);
 845            self.update_selections::<usize>(
 846                self.selections(cx)
 847                    .filter(|selection| selection.id != newest_selection.id)
 848                    .collect(),
 849                None,
 850                cx,
 851            )
 852        }
 853
 854        self.pending_selection = Some(PendingSelection { selection, mode });
 855
 856        cx.notify();
 857    }
 858
 859    fn begin_columnar_selection(
 860        &mut self,
 861        position: DisplayPoint,
 862        overshoot: u32,
 863        cx: &mut ViewContext<Self>,
 864    ) {
 865        if !self.focused {
 866            cx.focus_self();
 867            cx.emit(Event::Activate);
 868        }
 869
 870        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
 871        let buffer = self.buffer.read(cx);
 872
 873        let tail = self.newest_selection::<Point>(cx).tail();
 874        self.columnar_selection_tail = Some(buffer.anchor_before(tail));
 875
 876        self.select_columns(
 877            tail.to_display_point(&display_map),
 878            position,
 879            overshoot,
 880            &display_map,
 881            cx,
 882        );
 883    }
 884
 885    fn update_selection(
 886        &mut self,
 887        position: DisplayPoint,
 888        overshoot: u32,
 889        scroll_position: Vector2F,
 890        cx: &mut ViewContext<Self>,
 891    ) {
 892        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
 893
 894        if let Some(tail) = self.columnar_selection_tail.as_ref() {
 895            let tail = tail.to_display_point(&display_map);
 896            self.select_columns(tail, position, overshoot, &display_map, cx);
 897        } else if let Some(PendingSelection { selection, mode }) = self.pending_selection.as_mut() {
 898            let buffer = self.buffer.read(cx);
 899            let head;
 900            let tail;
 901            match mode {
 902                SelectMode::Character => {
 903                    head = position.to_point(&display_map);
 904                    tail = selection.tail().to_point(buffer);
 905                }
 906                SelectMode::Word(original_range) => {
 907                    let original_display_range = original_range.start.to_display_point(&display_map)
 908                        ..original_range.end.to_display_point(&display_map);
 909                    let original_buffer_range = original_display_range.start.to_point(&display_map)
 910                        ..original_display_range.end.to_point(&display_map);
 911                    if movement::is_inside_word(&display_map, position)
 912                        || original_display_range.contains(&position)
 913                    {
 914                        let word_range = movement::surrounding_word(&display_map, position);
 915                        if word_range.start < original_display_range.start {
 916                            head = word_range.start.to_point(&display_map);
 917                        } else {
 918                            head = word_range.end.to_point(&display_map);
 919                        }
 920                    } else {
 921                        head = position.to_point(&display_map);
 922                    }
 923
 924                    if head <= original_buffer_range.start {
 925                        tail = original_buffer_range.end;
 926                    } else {
 927                        tail = original_buffer_range.start;
 928                    }
 929                }
 930                SelectMode::Line(original_range) => {
 931                    let original_display_range = original_range.start.to_display_point(&display_map)
 932                        ..original_range.end.to_display_point(&display_map);
 933                    let original_buffer_range = original_display_range.start.to_point(&display_map)
 934                        ..original_display_range.end.to_point(&display_map);
 935                    let line_start = movement::line_beginning(&display_map, position, false);
 936                    let mut next_line_start = line_start.clone();
 937                    *next_line_start.row_mut() += 1;
 938                    *next_line_start.column_mut() = 0;
 939                    next_line_start = display_map.clip_point(next_line_start, Bias::Right);
 940
 941                    if line_start < original_display_range.start {
 942                        head = line_start.to_point(&display_map);
 943                    } else {
 944                        head = next_line_start.to_point(&display_map);
 945                    }
 946
 947                    if head <= original_buffer_range.start {
 948                        tail = original_buffer_range.end;
 949                    } else {
 950                        tail = original_buffer_range.start;
 951                    }
 952                }
 953                SelectMode::All => {
 954                    return;
 955                }
 956            };
 957
 958            if head < tail {
 959                selection.start = buffer.anchor_before(head);
 960                selection.end = buffer.anchor_before(tail);
 961                selection.reversed = true;
 962            } else {
 963                selection.start = buffer.anchor_before(tail);
 964                selection.end = buffer.anchor_before(head);
 965                selection.reversed = false;
 966            }
 967        } else {
 968            log::error!("update_selection dispatched with no pending selection");
 969            return;
 970        }
 971
 972        self.set_scroll_position(scroll_position, cx);
 973        cx.notify();
 974    }
 975
 976    fn end_selection(&mut self, cx: &mut ViewContext<Self>) {
 977        self.columnar_selection_tail.take();
 978        if self.pending_selection.is_some() {
 979            let selections = self.selections::<usize>(cx).collect::<Vec<_>>();
 980            self.update_selections(selections, None, cx);
 981        }
 982    }
 983
 984    fn select_columns(
 985        &mut self,
 986        tail: DisplayPoint,
 987        head: DisplayPoint,
 988        overshoot: u32,
 989        display_map: &DisplayMapSnapshot,
 990        cx: &mut ViewContext<Self>,
 991    ) {
 992        let start_row = cmp::min(tail.row(), head.row());
 993        let end_row = cmp::max(tail.row(), head.row());
 994        let start_column = cmp::min(tail.column(), head.column() + overshoot);
 995        let end_column = cmp::max(tail.column(), head.column() + overshoot);
 996        let reversed = start_column < tail.column();
 997
 998        let selections = (start_row..=end_row)
 999            .filter_map(|row| {
1000                if start_column <= display_map.line_len(row) && !display_map.is_block_line(row) {
1001                    let start = display_map
1002                        .clip_point(DisplayPoint::new(row, start_column), Bias::Left)
1003                        .to_point(&display_map);
1004                    let end = display_map
1005                        .clip_point(DisplayPoint::new(row, end_column), Bias::Right)
1006                        .to_point(&display_map);
1007                    Some(Selection {
1008                        id: post_inc(&mut self.next_selection_id),
1009                        start,
1010                        end,
1011                        reversed,
1012                        goal: SelectionGoal::None,
1013                    })
1014                } else {
1015                    None
1016                }
1017            })
1018            .collect::<Vec<_>>();
1019
1020        self.update_selections(selections, None, cx);
1021        cx.notify();
1022    }
1023
1024    pub fn is_selecting(&self) -> bool {
1025        self.pending_selection.is_some() || self.columnar_selection_tail.is_some()
1026    }
1027
1028    pub fn cancel(&mut self, _: &Cancel, cx: &mut ViewContext<Self>) {
1029        if self.active_diagnostics.is_some() {
1030            self.dismiss_diagnostics(cx);
1031        } else if let Some(PendingSelection { selection, .. }) = self.pending_selection.take() {
1032            let buffer = self.buffer.read(cx);
1033            let selection = Selection {
1034                id: selection.id,
1035                start: selection.start.to_point(buffer),
1036                end: selection.end.to_point(buffer),
1037                reversed: selection.reversed,
1038                goal: selection.goal,
1039            };
1040            if self.selections::<Point>(cx).next().is_none() {
1041                self.update_selections(vec![selection], Some(Autoscroll::Fit), cx);
1042            }
1043        } else {
1044            let mut oldest_selection = self.oldest_selection::<usize>(cx);
1045            if self.selection_count(cx) == 1 {
1046                oldest_selection.start = oldest_selection.head().clone();
1047                oldest_selection.end = oldest_selection.head().clone();
1048            }
1049            self.update_selections(vec![oldest_selection], Some(Autoscroll::Fit), cx);
1050        }
1051    }
1052
1053    pub fn select_ranges<I, T>(
1054        &mut self,
1055        ranges: I,
1056        autoscroll: Option<Autoscroll>,
1057        cx: &mut ViewContext<Self>,
1058    ) where
1059        I: IntoIterator<Item = Range<T>>,
1060        T: ToOffset,
1061    {
1062        let buffer = self.buffer.read(cx);
1063        let selections = ranges
1064            .into_iter()
1065            .map(|range| {
1066                let mut start = range.start.to_offset(buffer);
1067                let mut end = range.end.to_offset(buffer);
1068                let reversed = if start > end {
1069                    mem::swap(&mut start, &mut end);
1070                    true
1071                } else {
1072                    false
1073                };
1074                Selection {
1075                    id: post_inc(&mut self.next_selection_id),
1076                    start,
1077                    end,
1078                    reversed,
1079                    goal: SelectionGoal::None,
1080                }
1081            })
1082            .collect();
1083        self.update_selections(selections, autoscroll, cx);
1084    }
1085
1086    #[cfg(test)]
1087    fn select_display_ranges<'a, T>(
1088        &mut self,
1089        ranges: T,
1090        cx: &mut ViewContext<Self>,
1091    ) -> anyhow::Result<()>
1092    where
1093        T: IntoIterator<Item = &'a Range<DisplayPoint>>,
1094    {
1095        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
1096        let selections = ranges
1097            .into_iter()
1098            .map(|range| {
1099                let mut start = range.start;
1100                let mut end = range.end;
1101                let reversed = if start > end {
1102                    mem::swap(&mut start, &mut end);
1103                    true
1104                } else {
1105                    false
1106                };
1107                Selection {
1108                    id: post_inc(&mut self.next_selection_id),
1109                    start: start.to_point(&display_map),
1110                    end: end.to_point(&display_map),
1111                    reversed,
1112                    goal: SelectionGoal::None,
1113                }
1114            })
1115            .collect();
1116        self.update_selections(selections, None, cx);
1117        Ok(())
1118    }
1119
1120    pub fn handle_input(&mut self, action: &Input, cx: &mut ViewContext<Self>) {
1121        let text = action.0.as_ref();
1122        if !self.skip_autoclose_end(text, cx) {
1123            self.start_transaction(cx);
1124            self.insert(text, cx);
1125            self.autoclose_pairs(cx);
1126            self.end_transaction(cx);
1127        }
1128    }
1129
1130    pub fn newline(&mut self, _: &Newline, cx: &mut ViewContext<Self>) {
1131        self.start_transaction(cx);
1132        let mut old_selections = SmallVec::<[_; 32]>::new();
1133        {
1134            let selections = self.selections::<Point>(cx).collect::<Vec<_>>();
1135            let buffer = self.buffer.read(cx);
1136            for selection in selections.iter() {
1137                let start_point = selection.start;
1138                let indent = buffer
1139                    .indent_column_for_line(start_point.row)
1140                    .min(start_point.column);
1141                let start = selection.start.to_offset(buffer);
1142                let end = selection.end.to_offset(buffer);
1143
1144                let mut insert_extra_newline = false;
1145                if let Some(language) = buffer.language() {
1146                    let leading_whitespace_len = buffer
1147                        .reversed_chars_at(start)
1148                        .take_while(|c| c.is_whitespace() && *c != '\n')
1149                        .map(|c| c.len_utf8())
1150                        .sum::<usize>();
1151
1152                    let trailing_whitespace_len = buffer
1153                        .chars_at(end)
1154                        .take_while(|c| c.is_whitespace() && *c != '\n')
1155                        .map(|c| c.len_utf8())
1156                        .sum::<usize>();
1157
1158                    insert_extra_newline = language.brackets().iter().any(|pair| {
1159                        let pair_start = pair.start.trim_end();
1160                        let pair_end = pair.end.trim_start();
1161
1162                        pair.newline
1163                            && buffer.contains_str_at(end + trailing_whitespace_len, pair_end)
1164                            && buffer.contains_str_at(
1165                                (start - leading_whitespace_len).saturating_sub(pair_start.len()),
1166                                pair_start,
1167                            )
1168                    });
1169                }
1170
1171                old_selections.push((selection.id, start..end, indent, insert_extra_newline));
1172            }
1173        }
1174
1175        let mut new_selections = Vec::with_capacity(old_selections.len());
1176        self.buffer.update(cx, |buffer, cx| {
1177            let mut delta = 0_isize;
1178            let mut pending_edit: Option<PendingEdit> = None;
1179            for (_, range, indent, insert_extra_newline) in &old_selections {
1180                if pending_edit.as_ref().map_or(false, |pending| {
1181                    pending.indent != *indent
1182                        || pending.insert_extra_newline != *insert_extra_newline
1183                }) {
1184                    let pending = pending_edit.take().unwrap();
1185                    let mut new_text = String::with_capacity(1 + pending.indent as usize);
1186                    new_text.push('\n');
1187                    new_text.extend(iter::repeat(' ').take(pending.indent as usize));
1188                    if pending.insert_extra_newline {
1189                        new_text = new_text.repeat(2);
1190                    }
1191                    buffer.edit_with_autoindent(pending.ranges, new_text, cx);
1192                    delta += pending.delta;
1193                }
1194
1195                let start = (range.start as isize + delta) as usize;
1196                let end = (range.end as isize + delta) as usize;
1197                let mut text_len = *indent as usize + 1;
1198                if *insert_extra_newline {
1199                    text_len *= 2;
1200                }
1201
1202                let pending = pending_edit.get_or_insert_with(Default::default);
1203                pending.delta += text_len as isize - (end - start) as isize;
1204                pending.indent = *indent;
1205                pending.insert_extra_newline = *insert_extra_newline;
1206                pending.ranges.push(start..end);
1207            }
1208
1209            let pending = pending_edit.unwrap();
1210            let mut new_text = String::with_capacity(1 + pending.indent as usize);
1211            new_text.push('\n');
1212            new_text.extend(iter::repeat(' ').take(pending.indent as usize));
1213            if pending.insert_extra_newline {
1214                new_text = new_text.repeat(2);
1215            }
1216            buffer.edit_with_autoindent(pending.ranges, new_text, cx);
1217
1218            let mut delta = 0_isize;
1219            new_selections.extend(old_selections.into_iter().map(
1220                |(id, range, indent, insert_extra_newline)| {
1221                    let start = (range.start as isize + delta) as usize;
1222                    let end = (range.end as isize + delta) as usize;
1223                    let text_before_cursor_len = indent as usize + 1;
1224                    let cursor = start + text_before_cursor_len;
1225                    let text_len = if insert_extra_newline {
1226                        text_before_cursor_len * 2
1227                    } else {
1228                        text_before_cursor_len
1229                    };
1230                    delta += text_len as isize - (end - start) as isize;
1231                    Selection {
1232                        id,
1233                        start: cursor,
1234                        end: cursor,
1235                        reversed: false,
1236                        goal: SelectionGoal::None,
1237                    }
1238                },
1239            ))
1240        });
1241
1242        self.update_selections(new_selections, Some(Autoscroll::Fit), cx);
1243        self.end_transaction(cx);
1244
1245        #[derive(Default)]
1246        struct PendingEdit {
1247            indent: u32,
1248            insert_extra_newline: bool,
1249            delta: isize,
1250            ranges: SmallVec<[Range<usize>; 32]>,
1251        }
1252    }
1253
1254    fn insert(&mut self, text: &str, cx: &mut ViewContext<Self>) {
1255        self.start_transaction(cx);
1256        let old_selections = self.selections::<usize>(cx).collect::<SmallVec<[_; 32]>>();
1257        let mut new_selections = Vec::new();
1258        self.buffer.update(cx, |buffer, cx| {
1259            let edit_ranges = old_selections.iter().map(|s| s.start..s.end);
1260            buffer.edit_with_autoindent(edit_ranges, text, cx);
1261            let text_len = text.len() as isize;
1262            let mut delta = 0_isize;
1263            new_selections = old_selections
1264                .into_iter()
1265                .map(|selection| {
1266                    let start = selection.start as isize;
1267                    let end = selection.end as isize;
1268                    let cursor = (start + delta + text_len) as usize;
1269                    let deleted_count = end - start;
1270                    delta += text_len - deleted_count;
1271                    Selection {
1272                        id: selection.id,
1273                        start: cursor,
1274                        end: cursor,
1275                        reversed: false,
1276                        goal: SelectionGoal::None,
1277                    }
1278                })
1279                .collect();
1280        });
1281
1282        self.update_selections(new_selections, Some(Autoscroll::Fit), cx);
1283        self.end_transaction(cx);
1284    }
1285
1286    fn autoclose_pairs(&mut self, cx: &mut ViewContext<Self>) {
1287        let selections = self.selections::<usize>(cx).collect::<Vec<_>>();
1288        let new_autoclose_pair = self.buffer.update(cx, |buffer, cx| {
1289            let autoclose_pair = buffer.language().and_then(|language| {
1290                let first_selection_start = selections.first().unwrap().start;
1291                let pair = language.brackets().iter().find(|pair| {
1292                    buffer.contains_str_at(
1293                        first_selection_start.saturating_sub(pair.start.len()),
1294                        &pair.start,
1295                    )
1296                });
1297                pair.and_then(|pair| {
1298                    let should_autoclose = selections[1..].iter().all(|selection| {
1299                        buffer.contains_str_at(
1300                            selection.start.saturating_sub(pair.start.len()),
1301                            &pair.start,
1302                        )
1303                    });
1304
1305                    if should_autoclose {
1306                        Some(pair.clone())
1307                    } else {
1308                        None
1309                    }
1310                })
1311            });
1312
1313            autoclose_pair.and_then(|pair| {
1314                let selection_ranges = selections
1315                    .iter()
1316                    .map(|selection| {
1317                        let start = selection.start.to_offset(&*buffer);
1318                        start..start
1319                    })
1320                    .collect::<SmallVec<[_; 32]>>();
1321
1322                buffer.edit(selection_ranges, &pair.end, cx);
1323
1324                if pair.end.len() == 1 {
1325                    let mut delta = 0;
1326                    Some(BracketPairState {
1327                        ranges: selections
1328                            .iter()
1329                            .map(move |selection| {
1330                                let offset = selection.start + delta;
1331                                delta += 1;
1332                                buffer.anchor_before(offset)..buffer.anchor_after(offset)
1333                            })
1334                            .collect(),
1335                        pair,
1336                    })
1337                } else {
1338                    None
1339                }
1340            })
1341        });
1342        self.autoclose_stack.extend(new_autoclose_pair);
1343    }
1344
1345    fn skip_autoclose_end(&mut self, text: &str, cx: &mut ViewContext<Self>) -> bool {
1346        let old_selections = self.selections::<usize>(cx).collect::<Vec<_>>();
1347        let autoclose_pair = if let Some(autoclose_pair) = self.autoclose_stack.last() {
1348            autoclose_pair
1349        } else {
1350            return false;
1351        };
1352        if text != autoclose_pair.pair.end {
1353            return false;
1354        }
1355
1356        debug_assert_eq!(old_selections.len(), autoclose_pair.ranges.len());
1357
1358        let buffer = self.buffer.read(cx);
1359        if old_selections
1360            .iter()
1361            .zip(autoclose_pair.ranges.iter().map(|r| r.to_offset(buffer)))
1362            .all(|(selection, autoclose_range)| {
1363                let autoclose_range_end = autoclose_range.end.to_offset(buffer);
1364                selection.is_empty() && selection.start == autoclose_range_end
1365            })
1366        {
1367            let new_selections = old_selections
1368                .into_iter()
1369                .map(|selection| {
1370                    let cursor = selection.start + 1;
1371                    Selection {
1372                        id: selection.id,
1373                        start: cursor,
1374                        end: cursor,
1375                        reversed: false,
1376                        goal: SelectionGoal::None,
1377                    }
1378                })
1379                .collect();
1380            self.autoclose_stack.pop();
1381            self.update_selections(new_selections, Some(Autoscroll::Fit), cx);
1382            true
1383        } else {
1384            false
1385        }
1386    }
1387
1388    pub fn clear(&mut self, cx: &mut ViewContext<Self>) {
1389        self.start_transaction(cx);
1390        self.select_all(&SelectAll, cx);
1391        self.insert("", cx);
1392        self.end_transaction(cx);
1393    }
1394
1395    pub fn backspace(&mut self, _: &Backspace, cx: &mut ViewContext<Self>) {
1396        self.start_transaction(cx);
1397        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
1398        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
1399        for selection in &mut selections {
1400            if selection.is_empty() {
1401                let head = selection.head().to_display_point(&display_map);
1402                let cursor = movement::left(&display_map, head)
1403                    .unwrap()
1404                    .to_point(&display_map);
1405                selection.set_head(cursor);
1406                selection.goal = SelectionGoal::None;
1407            }
1408        }
1409        self.update_selections(selections, Some(Autoscroll::Fit), cx);
1410        self.insert("", cx);
1411        self.end_transaction(cx);
1412    }
1413
1414    pub fn delete(&mut self, _: &Delete, cx: &mut ViewContext<Self>) {
1415        self.start_transaction(cx);
1416        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
1417        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
1418        for selection in &mut selections {
1419            if selection.is_empty() {
1420                let head = selection.head().to_display_point(&display_map);
1421                let cursor = movement::right(&display_map, head)
1422                    .unwrap()
1423                    .to_point(&display_map);
1424                selection.set_head(cursor);
1425                selection.goal = SelectionGoal::None;
1426            }
1427        }
1428        self.update_selections(selections, Some(Autoscroll::Fit), cx);
1429        self.insert(&"", cx);
1430        self.end_transaction(cx);
1431    }
1432
1433    pub fn tab(&mut self, _: &Tab, cx: &mut ViewContext<Self>) {
1434        self.start_transaction(cx);
1435        let tab_size = self.build_settings.borrow()(cx).tab_size;
1436        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
1437        let mut last_indent = None;
1438        self.buffer.update(cx, |buffer, cx| {
1439            for selection in &mut selections {
1440                if selection.is_empty() {
1441                    let char_column = buffer
1442                        .chars_for_range(Point::new(selection.start.row, 0)..selection.start)
1443                        .count();
1444                    let chars_to_next_tab_stop = tab_size - (char_column % tab_size);
1445                    buffer.edit(
1446                        [selection.start..selection.start],
1447                        " ".repeat(chars_to_next_tab_stop),
1448                        cx,
1449                    );
1450                    selection.start.column += chars_to_next_tab_stop as u32;
1451                    selection.end = selection.start;
1452                } else {
1453                    let mut start_row = selection.start.row;
1454                    let mut end_row = selection.end.row + 1;
1455
1456                    // If a selection ends at the beginning of a line, don't indent
1457                    // that last line.
1458                    if selection.end.column == 0 {
1459                        end_row -= 1;
1460                    }
1461
1462                    // Avoid re-indenting a row that has already been indented by a
1463                    // previous selection, but still update this selection's column
1464                    // to reflect that indentation.
1465                    if let Some((last_indent_row, last_indent_len)) = last_indent {
1466                        if last_indent_row == selection.start.row {
1467                            selection.start.column += last_indent_len;
1468                            start_row += 1;
1469                        }
1470                        if last_indent_row == selection.end.row {
1471                            selection.end.column += last_indent_len;
1472                        }
1473                    }
1474
1475                    for row in start_row..end_row {
1476                        let indent_column = buffer.indent_column_for_line(row) as usize;
1477                        let columns_to_next_tab_stop = tab_size - (indent_column % tab_size);
1478                        let row_start = Point::new(row, 0);
1479                        buffer.edit(
1480                            [row_start..row_start],
1481                            " ".repeat(columns_to_next_tab_stop),
1482                            cx,
1483                        );
1484
1485                        // Update this selection's endpoints to reflect the indentation.
1486                        if row == selection.start.row {
1487                            selection.start.column += columns_to_next_tab_stop as u32;
1488                        }
1489                        if row == selection.end.row {
1490                            selection.end.column += columns_to_next_tab_stop as u32;
1491                        }
1492
1493                        last_indent = Some((row, columns_to_next_tab_stop as u32));
1494                    }
1495                }
1496            }
1497        });
1498
1499        self.update_selections(selections, Some(Autoscroll::Fit), cx);
1500        self.end_transaction(cx);
1501    }
1502
1503    pub fn outdent(&mut self, _: &Outdent, cx: &mut ViewContext<Self>) {
1504        self.start_transaction(cx);
1505        let tab_size = self.build_settings.borrow()(cx).tab_size;
1506        let selections = self.selections::<Point>(cx).collect::<Vec<_>>();
1507        let mut deletion_ranges = Vec::new();
1508        let mut last_outdent = None;
1509        self.buffer.update(cx, |buffer, cx| {
1510            for selection in &selections {
1511                let mut start_row = selection.start.row;
1512                let mut end_row = selection.end.row + 1;
1513
1514                // If a selection ends at the beginning of a line, don't indent
1515                // that last line.
1516                if selection.end.column == 0 {
1517                    end_row -= 1;
1518                }
1519
1520                // Avoid re-outdenting a row that has already been outdented by a
1521                // previous selection.
1522                if let Some(last_row) = last_outdent {
1523                    if last_row == selection.start.row {
1524                        start_row += 1;
1525                    }
1526                }
1527
1528                for row in start_row..end_row {
1529                    let column = buffer.indent_column_for_line(row) as usize;
1530                    if column > 0 {
1531                        let mut deletion_len = (column % tab_size) as u32;
1532                        if deletion_len == 0 {
1533                            deletion_len = tab_size as u32;
1534                        }
1535                        deletion_ranges.push(Point::new(row, 0)..Point::new(row, deletion_len));
1536                        last_outdent = Some(row);
1537                    }
1538                }
1539            }
1540            buffer.edit(deletion_ranges, "", cx);
1541        });
1542
1543        self.update_selections(
1544            self.selections::<usize>(cx).collect(),
1545            Some(Autoscroll::Fit),
1546            cx,
1547        );
1548        self.end_transaction(cx);
1549    }
1550
1551    pub fn delete_line(&mut self, _: &DeleteLine, cx: &mut ViewContext<Self>) {
1552        self.start_transaction(cx);
1553
1554        let selections = self.selections::<Point>(cx).collect::<Vec<_>>();
1555        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
1556        let buffer = self.buffer.read(cx);
1557
1558        let mut row_delta = 0;
1559        let mut new_cursors = Vec::new();
1560        let mut edit_ranges = Vec::new();
1561        let mut selections = selections.iter().peekable();
1562        while let Some(selection) = selections.next() {
1563            let mut rows = selection.spanned_rows(false, &display_map).buffer_rows;
1564            let goal_display_column = selection.head().to_display_point(&display_map).column();
1565
1566            // Accumulate contiguous regions of rows that we want to delete.
1567            while let Some(next_selection) = selections.peek() {
1568                let next_rows = next_selection.spanned_rows(false, &display_map).buffer_rows;
1569                if next_rows.start <= rows.end {
1570                    rows.end = next_rows.end;
1571                    selections.next().unwrap();
1572                } else {
1573                    break;
1574                }
1575            }
1576
1577            let mut edit_start = Point::new(rows.start, 0).to_offset(buffer);
1578            let edit_end;
1579            let cursor_buffer_row;
1580            if buffer.max_point().row >= rows.end {
1581                // If there's a line after the range, delete the \n from the end of the row range
1582                // and position the cursor on the next line.
1583                edit_end = Point::new(rows.end, 0).to_offset(buffer);
1584                cursor_buffer_row = rows.start;
1585            } else {
1586                // If there isn't a line after the range, delete the \n from the line before the
1587                // start of the row range and position the cursor there.
1588                edit_start = edit_start.saturating_sub(1);
1589                edit_end = buffer.len();
1590                cursor_buffer_row = rows.start.saturating_sub(1);
1591            }
1592
1593            let mut cursor =
1594                Point::new(cursor_buffer_row - row_delta, 0).to_display_point(&display_map);
1595            *cursor.column_mut() =
1596                cmp::min(goal_display_column, display_map.line_len(cursor.row()));
1597            row_delta += rows.len() as u32;
1598
1599            new_cursors.push((selection.id, cursor.to_point(&display_map)));
1600            edit_ranges.push(edit_start..edit_end);
1601        }
1602
1603        new_cursors.sort_unstable_by_key(|(_, point)| point.clone());
1604        let new_selections = new_cursors
1605            .into_iter()
1606            .map(|(id, cursor)| Selection {
1607                id,
1608                start: cursor,
1609                end: cursor,
1610                reversed: false,
1611                goal: SelectionGoal::None,
1612            })
1613            .collect();
1614        self.buffer
1615            .update(cx, |buffer, cx| buffer.edit(edit_ranges, "", cx));
1616        self.update_selections(new_selections, Some(Autoscroll::Fit), cx);
1617        self.end_transaction(cx);
1618    }
1619
1620    pub fn duplicate_line(&mut self, _: &DuplicateLine, cx: &mut ViewContext<Self>) {
1621        self.start_transaction(cx);
1622
1623        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
1624        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
1625        let buffer = self.buffer.read(cx);
1626
1627        let mut edits = Vec::new();
1628        let mut selections_iter = selections.iter().peekable();
1629        while let Some(selection) = selections_iter.next() {
1630            // Avoid duplicating the same lines twice.
1631            let mut rows = selection.spanned_rows(false, &display_map).buffer_rows;
1632
1633            while let Some(next_selection) = selections_iter.peek() {
1634                let next_rows = next_selection.spanned_rows(false, &display_map).buffer_rows;
1635                if next_rows.start <= rows.end - 1 {
1636                    rows.end = next_rows.end;
1637                    selections_iter.next().unwrap();
1638                } else {
1639                    break;
1640                }
1641            }
1642
1643            // Copy the text from the selected row region and splice it at the start of the region.
1644            let start = Point::new(rows.start, 0);
1645            let end = Point::new(rows.end - 1, buffer.line_len(rows.end - 1));
1646            let text = buffer
1647                .text_for_range(start..end)
1648                .chain(Some("\n"))
1649                .collect::<String>();
1650            edits.push((start, text, rows.len() as u32));
1651        }
1652
1653        let mut edits_iter = edits.iter().peekable();
1654        let mut row_delta = 0;
1655        for selection in selections.iter_mut() {
1656            while let Some((point, _, line_count)) = edits_iter.peek() {
1657                if *point <= selection.start {
1658                    row_delta += line_count;
1659                    edits_iter.next();
1660                } else {
1661                    break;
1662                }
1663            }
1664            selection.start.row += row_delta;
1665            selection.end.row += row_delta;
1666        }
1667
1668        self.buffer.update(cx, |buffer, cx| {
1669            for (point, text, _) in edits.into_iter().rev() {
1670                buffer.edit(Some(point..point), text, cx);
1671            }
1672        });
1673
1674        self.update_selections(selections, Some(Autoscroll::Fit), cx);
1675        self.end_transaction(cx);
1676    }
1677
1678    pub fn move_line_up(&mut self, _: &MoveLineUp, cx: &mut ViewContext<Self>) {
1679        self.start_transaction(cx);
1680
1681        let selections = self.selections::<Point>(cx).collect::<Vec<_>>();
1682        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
1683        let buffer = self.buffer.read(cx);
1684
1685        let mut edits = Vec::new();
1686        let mut new_selection_ranges = Vec::new();
1687        let mut old_folds = Vec::new();
1688        let mut new_folds = Vec::new();
1689
1690        let mut selections = selections.iter().peekable();
1691        let mut contiguous_selections = Vec::new();
1692        while let Some(selection) = selections.next() {
1693            // Accumulate contiguous regions of rows that we want to move.
1694            contiguous_selections.push(selection.point_range(buffer));
1695            let SpannedRows {
1696                mut buffer_rows,
1697                mut display_rows,
1698            } = selection.spanned_rows(false, &display_map);
1699
1700            while let Some(next_selection) = selections.peek() {
1701                let SpannedRows {
1702                    buffer_rows: next_buffer_rows,
1703                    display_rows: next_display_rows,
1704                } = next_selection.spanned_rows(false, &display_map);
1705                if next_buffer_rows.start <= buffer_rows.end {
1706                    buffer_rows.end = next_buffer_rows.end;
1707                    display_rows.end = next_display_rows.end;
1708                    contiguous_selections.push(next_selection.point_range(buffer));
1709                    selections.next().unwrap();
1710                } else {
1711                    break;
1712                }
1713            }
1714
1715            // Cut the text from the selected rows and paste it at the start of the previous line.
1716            if display_rows.start != 0 {
1717                let start = Point::new(buffer_rows.start, 0).to_offset(buffer);
1718                let end = Point::new(buffer_rows.end - 1, buffer.line_len(buffer_rows.end - 1))
1719                    .to_offset(buffer);
1720
1721                let prev_row_display_start = DisplayPoint::new(display_rows.start - 1, 0);
1722                let prev_row_buffer_start = display_map.prev_row_boundary(prev_row_display_start).1;
1723                let prev_row_buffer_start_offset = prev_row_buffer_start.to_offset(buffer);
1724
1725                let mut text = String::new();
1726                text.extend(buffer.text_for_range(start..end));
1727                text.push('\n');
1728                edits.push((
1729                    prev_row_buffer_start_offset..prev_row_buffer_start_offset,
1730                    text,
1731                ));
1732                edits.push((start - 1..end, String::new()));
1733
1734                let row_delta = buffer_rows.start - prev_row_buffer_start.row;
1735
1736                // Move selections up.
1737                for range in &mut contiguous_selections {
1738                    range.start.row -= row_delta;
1739                    range.end.row -= row_delta;
1740                }
1741
1742                // Move folds up.
1743                old_folds.push(start..end);
1744                for fold in display_map.folds_in_range(start..end) {
1745                    let mut start = fold.start.to_point(buffer);
1746                    let mut end = fold.end.to_point(buffer);
1747                    start.row -= row_delta;
1748                    end.row -= row_delta;
1749                    new_folds.push(start..end);
1750                }
1751            }
1752
1753            new_selection_ranges.extend(contiguous_selections.drain(..));
1754        }
1755
1756        self.unfold_ranges(old_folds, cx);
1757        self.buffer.update(cx, |buffer, cx| {
1758            for (range, text) in edits.into_iter().rev() {
1759                buffer.edit(Some(range), text, cx);
1760            }
1761        });
1762        self.fold_ranges(new_folds, cx);
1763        self.select_ranges(new_selection_ranges, Some(Autoscroll::Fit), cx);
1764
1765        self.end_transaction(cx);
1766    }
1767
1768    pub fn move_line_down(&mut self, _: &MoveLineDown, cx: &mut ViewContext<Self>) {
1769        self.start_transaction(cx);
1770
1771        let selections = self.selections::<Point>(cx).collect::<Vec<_>>();
1772        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
1773        let buffer = self.buffer.read(cx);
1774
1775        let mut edits = Vec::new();
1776        let mut new_selection_ranges = Vec::new();
1777        let mut old_folds = Vec::new();
1778        let mut new_folds = Vec::new();
1779
1780        let mut selections = selections.iter().peekable();
1781        let mut contiguous_selections = Vec::new();
1782        while let Some(selection) = selections.next() {
1783            // Accumulate contiguous regions of rows that we want to move.
1784            contiguous_selections.push(selection.point_range(buffer));
1785            let SpannedRows {
1786                mut buffer_rows,
1787                mut display_rows,
1788            } = selection.spanned_rows(false, &display_map);
1789            while let Some(next_selection) = selections.peek() {
1790                let SpannedRows {
1791                    buffer_rows: next_buffer_rows,
1792                    display_rows: next_display_rows,
1793                } = next_selection.spanned_rows(false, &display_map);
1794                if next_buffer_rows.start <= buffer_rows.end {
1795                    buffer_rows.end = next_buffer_rows.end;
1796                    display_rows.end = next_display_rows.end;
1797                    contiguous_selections.push(next_selection.point_range(buffer));
1798                    selections.next().unwrap();
1799                } else {
1800                    break;
1801                }
1802            }
1803
1804            // Cut the text from the selected rows and paste it at the end of the next line.
1805            if display_rows.end <= display_map.max_point().row() {
1806                let start = Point::new(buffer_rows.start, 0).to_offset(buffer);
1807                let end = Point::new(buffer_rows.end - 1, buffer.line_len(buffer_rows.end - 1))
1808                    .to_offset(buffer);
1809
1810                let next_row_display_end =
1811                    DisplayPoint::new(display_rows.end, display_map.line_len(display_rows.end));
1812                let next_row_buffer_end = display_map.next_row_boundary(next_row_display_end).1;
1813                let next_row_buffer_end_offset = next_row_buffer_end.to_offset(buffer);
1814
1815                let mut text = String::new();
1816                text.push('\n');
1817                text.extend(buffer.text_for_range(start..end));
1818                edits.push((start..end + 1, String::new()));
1819                edits.push((next_row_buffer_end_offset..next_row_buffer_end_offset, text));
1820
1821                let row_delta = next_row_buffer_end.row - buffer_rows.end + 1;
1822
1823                // Move selections down.
1824                for range in &mut contiguous_selections {
1825                    range.start.row += row_delta;
1826                    range.end.row += row_delta;
1827                }
1828
1829                // Move folds down.
1830                old_folds.push(start..end);
1831                for fold in display_map.folds_in_range(start..end) {
1832                    let mut start = fold.start.to_point(buffer);
1833                    let mut end = fold.end.to_point(buffer);
1834                    start.row += row_delta;
1835                    end.row += row_delta;
1836                    new_folds.push(start..end);
1837                }
1838            }
1839
1840            new_selection_ranges.extend(contiguous_selections.drain(..));
1841        }
1842
1843        self.unfold_ranges(old_folds, cx);
1844        self.buffer.update(cx, |buffer, cx| {
1845            for (range, text) in edits.into_iter().rev() {
1846                buffer.edit(Some(range), text, cx);
1847            }
1848        });
1849        self.fold_ranges(new_folds, cx);
1850        self.select_ranges(new_selection_ranges, Some(Autoscroll::Fit), cx);
1851
1852        self.end_transaction(cx);
1853    }
1854
1855    pub fn cut(&mut self, _: &Cut, cx: &mut ViewContext<Self>) {
1856        self.start_transaction(cx);
1857        let mut text = String::new();
1858        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
1859        let mut clipboard_selections = Vec::with_capacity(selections.len());
1860        {
1861            let buffer = self.buffer.read(cx);
1862            let max_point = buffer.max_point();
1863            for selection in &mut selections {
1864                let is_entire_line = selection.is_empty();
1865                if is_entire_line {
1866                    selection.start = Point::new(selection.start.row, 0);
1867                    selection.end = cmp::min(max_point, Point::new(selection.end.row + 1, 0));
1868                }
1869                let mut len = 0;
1870                for chunk in buffer.text_for_range(selection.start..selection.end) {
1871                    text.push_str(chunk);
1872                    len += chunk.len();
1873                }
1874                clipboard_selections.push(ClipboardSelection {
1875                    len,
1876                    is_entire_line,
1877                });
1878            }
1879        }
1880        self.update_selections(selections, Some(Autoscroll::Fit), cx);
1881        self.insert("", cx);
1882        self.end_transaction(cx);
1883
1884        cx.as_mut()
1885            .write_to_clipboard(ClipboardItem::new(text).with_metadata(clipboard_selections));
1886    }
1887
1888    pub fn copy(&mut self, _: &Copy, cx: &mut ViewContext<Self>) {
1889        let selections = self.selections::<Point>(cx).collect::<Vec<_>>();
1890        let buffer = self.buffer.read(cx);
1891        let max_point = buffer.max_point();
1892        let mut text = String::new();
1893        let mut clipboard_selections = Vec::with_capacity(selections.len());
1894        for selection in selections.iter() {
1895            let mut start = selection.start;
1896            let mut end = selection.end;
1897            let is_entire_line = selection.is_empty();
1898            if is_entire_line {
1899                start = Point::new(start.row, 0);
1900                end = cmp::min(max_point, Point::new(start.row + 1, 0));
1901            }
1902            let mut len = 0;
1903            for chunk in buffer.text_for_range(start..end) {
1904                text.push_str(chunk);
1905                len += chunk.len();
1906            }
1907            clipboard_selections.push(ClipboardSelection {
1908                len,
1909                is_entire_line,
1910            });
1911        }
1912
1913        cx.as_mut()
1914            .write_to_clipboard(ClipboardItem::new(text).with_metadata(clipboard_selections));
1915    }
1916
1917    pub fn paste(&mut self, _: &Paste, cx: &mut ViewContext<Self>) {
1918        if let Some(item) = cx.as_mut().read_from_clipboard() {
1919            let clipboard_text = item.text();
1920            if let Some(mut clipboard_selections) = item.metadata::<Vec<ClipboardSelection>>() {
1921                let mut selections = self.selections::<usize>(cx).collect::<Vec<_>>();
1922                let all_selections_were_entire_line =
1923                    clipboard_selections.iter().all(|s| s.is_entire_line);
1924                if clipboard_selections.len() != selections.len() {
1925                    clipboard_selections.clear();
1926                }
1927
1928                let mut delta = 0_isize;
1929                let mut start_offset = 0;
1930                for (i, selection) in selections.iter_mut().enumerate() {
1931                    let to_insert;
1932                    let entire_line;
1933                    if let Some(clipboard_selection) = clipboard_selections.get(i) {
1934                        let end_offset = start_offset + clipboard_selection.len;
1935                        to_insert = &clipboard_text[start_offset..end_offset];
1936                        entire_line = clipboard_selection.is_entire_line;
1937                        start_offset = end_offset
1938                    } else {
1939                        to_insert = clipboard_text.as_str();
1940                        entire_line = all_selections_were_entire_line;
1941                    }
1942
1943                    selection.start = (selection.start as isize + delta) as usize;
1944                    selection.end = (selection.end as isize + delta) as usize;
1945
1946                    self.buffer.update(cx, |buffer, cx| {
1947                        // If the corresponding selection was empty when this slice of the
1948                        // clipboard text was written, then the entire line containing the
1949                        // selection was copied. If this selection is also currently empty,
1950                        // then paste the line before the current line of the buffer.
1951                        let range = if selection.is_empty() && entire_line {
1952                            let column = selection.start.to_point(&*buffer).column as usize;
1953                            let line_start = selection.start - column;
1954                            line_start..line_start
1955                        } else {
1956                            selection.start..selection.end
1957                        };
1958
1959                        delta += to_insert.len() as isize - range.len() as isize;
1960                        buffer.edit([range], to_insert, cx);
1961                        selection.start += to_insert.len();
1962                        selection.end = selection.start;
1963                    });
1964                }
1965                self.update_selections(selections, Some(Autoscroll::Fit), cx);
1966            } else {
1967                self.insert(clipboard_text, cx);
1968            }
1969        }
1970    }
1971
1972    pub fn undo(&mut self, _: &Undo, cx: &mut ViewContext<Self>) {
1973        self.buffer.update(cx, |buffer, cx| buffer.undo(cx));
1974        self.request_autoscroll(Autoscroll::Fit, cx);
1975    }
1976
1977    pub fn redo(&mut self, _: &Redo, cx: &mut ViewContext<Self>) {
1978        self.buffer.update(cx, |buffer, cx| buffer.redo(cx));
1979        self.request_autoscroll(Autoscroll::Fit, cx);
1980    }
1981
1982    pub fn move_left(&mut self, _: &MoveLeft, cx: &mut ViewContext<Self>) {
1983        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
1984        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
1985        for selection in &mut selections {
1986            let start = selection.start.to_display_point(&display_map);
1987            let end = selection.end.to_display_point(&display_map);
1988
1989            if start != end {
1990                selection.end = selection.start.clone();
1991            } else {
1992                let cursor = movement::left(&display_map, start)
1993                    .unwrap()
1994                    .to_point(&display_map);
1995                selection.start = cursor.clone();
1996                selection.end = cursor;
1997            }
1998            selection.reversed = false;
1999            selection.goal = SelectionGoal::None;
2000        }
2001        self.update_selections(selections, Some(Autoscroll::Fit), cx);
2002    }
2003
2004    pub fn select_left(&mut self, _: &SelectLeft, cx: &mut ViewContext<Self>) {
2005        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2006        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
2007        for selection in &mut selections {
2008            let head = selection.head().to_display_point(&display_map);
2009            let cursor = movement::left(&display_map, head)
2010                .unwrap()
2011                .to_point(&display_map);
2012            selection.set_head(cursor);
2013            selection.goal = SelectionGoal::None;
2014        }
2015        self.update_selections(selections, Some(Autoscroll::Fit), cx);
2016    }
2017
2018    pub fn move_right(&mut self, _: &MoveRight, cx: &mut ViewContext<Self>) {
2019        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2020        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
2021        for selection in &mut selections {
2022            let start = selection.start.to_display_point(&display_map);
2023            let end = selection.end.to_display_point(&display_map);
2024
2025            if start != end {
2026                selection.start = selection.end.clone();
2027            } else {
2028                let cursor = movement::right(&display_map, end)
2029                    .unwrap()
2030                    .to_point(&display_map);
2031                selection.start = cursor;
2032                selection.end = cursor;
2033            }
2034            selection.reversed = false;
2035            selection.goal = SelectionGoal::None;
2036        }
2037        self.update_selections(selections, Some(Autoscroll::Fit), cx);
2038    }
2039
2040    pub fn select_right(&mut self, _: &SelectRight, cx: &mut ViewContext<Self>) {
2041        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2042        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
2043        for selection in &mut selections {
2044            let head = selection.head().to_display_point(&display_map);
2045            let cursor = movement::right(&display_map, head)
2046                .unwrap()
2047                .to_point(&display_map);
2048            selection.set_head(cursor);
2049            selection.goal = SelectionGoal::None;
2050        }
2051        self.update_selections(selections, Some(Autoscroll::Fit), cx);
2052    }
2053
2054    pub fn move_up(&mut self, _: &MoveUp, cx: &mut ViewContext<Self>) {
2055        if matches!(self.mode, EditorMode::SingleLine) {
2056            cx.propagate_action();
2057            return;
2058        }
2059
2060        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2061        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
2062        for selection in &mut selections {
2063            let start = selection.start.to_display_point(&display_map);
2064            let end = selection.end.to_display_point(&display_map);
2065            if start != end {
2066                selection.goal = SelectionGoal::None;
2067            }
2068
2069            let (start, goal) = movement::up(&display_map, start, selection.goal).unwrap();
2070            let cursor = start.to_point(&display_map);
2071            selection.start = cursor;
2072            selection.end = cursor;
2073            selection.goal = goal;
2074            selection.reversed = false;
2075        }
2076        self.update_selections(selections, Some(Autoscroll::Fit), cx);
2077    }
2078
2079    pub fn select_up(&mut self, _: &SelectUp, cx: &mut ViewContext<Self>) {
2080        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2081        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
2082        for selection in &mut selections {
2083            let head = selection.head().to_display_point(&display_map);
2084            let (head, goal) = movement::up(&display_map, head, selection.goal).unwrap();
2085            let cursor = head.to_point(&display_map);
2086            selection.set_head(cursor);
2087            selection.goal = goal;
2088        }
2089        self.update_selections(selections, Some(Autoscroll::Fit), cx);
2090    }
2091
2092    pub fn move_down(&mut self, _: &MoveDown, cx: &mut ViewContext<Self>) {
2093        if matches!(self.mode, EditorMode::SingleLine) {
2094            cx.propagate_action();
2095            return;
2096        }
2097
2098        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2099        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
2100        for selection in &mut selections {
2101            let start = selection.start.to_display_point(&display_map);
2102            let end = selection.end.to_display_point(&display_map);
2103            if start != end {
2104                selection.goal = SelectionGoal::None;
2105            }
2106
2107            let (start, goal) = movement::down(&display_map, end, selection.goal).unwrap();
2108            let cursor = start.to_point(&display_map);
2109            selection.start = cursor;
2110            selection.end = cursor;
2111            selection.goal = goal;
2112            selection.reversed = false;
2113        }
2114        self.update_selections(selections, Some(Autoscroll::Fit), cx);
2115    }
2116
2117    pub fn select_down(&mut self, _: &SelectDown, cx: &mut ViewContext<Self>) {
2118        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2119        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
2120        for selection in &mut selections {
2121            let head = selection.head().to_display_point(&display_map);
2122            let (head, goal) = movement::down(&display_map, head, selection.goal).unwrap();
2123            let cursor = head.to_point(&display_map);
2124            selection.set_head(cursor);
2125            selection.goal = goal;
2126        }
2127        self.update_selections(selections, Some(Autoscroll::Fit), cx);
2128    }
2129
2130    pub fn move_to_previous_word_boundary(
2131        &mut self,
2132        _: &MoveToPreviousWordBoundary,
2133        cx: &mut ViewContext<Self>,
2134    ) {
2135        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2136        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
2137        for selection in &mut selections {
2138            let head = selection.head().to_display_point(&display_map);
2139            let cursor = movement::prev_word_boundary(&display_map, head).to_point(&display_map);
2140            selection.start = cursor.clone();
2141            selection.end = cursor;
2142            selection.reversed = false;
2143            selection.goal = SelectionGoal::None;
2144        }
2145        self.update_selections(selections, Some(Autoscroll::Fit), cx);
2146    }
2147
2148    pub fn select_to_previous_word_boundary(
2149        &mut self,
2150        _: &SelectToPreviousWordBoundary,
2151        cx: &mut ViewContext<Self>,
2152    ) {
2153        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2154        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
2155        for selection in &mut selections {
2156            let head = selection.head().to_display_point(&display_map);
2157            let cursor = movement::prev_word_boundary(&display_map, head).to_point(&display_map);
2158            selection.set_head(cursor);
2159            selection.goal = SelectionGoal::None;
2160        }
2161        self.update_selections(selections, Some(Autoscroll::Fit), cx);
2162    }
2163
2164    pub fn delete_to_previous_word_boundary(
2165        &mut self,
2166        _: &DeleteToPreviousWordBoundary,
2167        cx: &mut ViewContext<Self>,
2168    ) {
2169        self.start_transaction(cx);
2170        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2171        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
2172        for selection in &mut selections {
2173            if selection.is_empty() {
2174                let head = selection.head().to_display_point(&display_map);
2175                let cursor =
2176                    movement::prev_word_boundary(&display_map, head).to_point(&display_map);
2177                selection.set_head(cursor);
2178                selection.goal = SelectionGoal::None;
2179            }
2180        }
2181        self.update_selections(selections, Some(Autoscroll::Fit), cx);
2182        self.insert("", cx);
2183        self.end_transaction(cx);
2184    }
2185
2186    pub fn move_to_next_word_boundary(
2187        &mut self,
2188        _: &MoveToNextWordBoundary,
2189        cx: &mut ViewContext<Self>,
2190    ) {
2191        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2192        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
2193        for selection in &mut selections {
2194            let head = selection.head().to_display_point(&display_map);
2195            let cursor = movement::next_word_boundary(&display_map, head).to_point(&display_map);
2196            selection.start = cursor;
2197            selection.end = cursor;
2198            selection.reversed = false;
2199            selection.goal = SelectionGoal::None;
2200        }
2201        self.update_selections(selections, Some(Autoscroll::Fit), cx);
2202    }
2203
2204    pub fn select_to_next_word_boundary(
2205        &mut self,
2206        _: &SelectToNextWordBoundary,
2207        cx: &mut ViewContext<Self>,
2208    ) {
2209        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2210        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
2211        for selection in &mut selections {
2212            let head = selection.head().to_display_point(&display_map);
2213            let cursor = movement::next_word_boundary(&display_map, head).to_point(&display_map);
2214            selection.set_head(cursor);
2215            selection.goal = SelectionGoal::None;
2216        }
2217        self.update_selections(selections, Some(Autoscroll::Fit), cx);
2218    }
2219
2220    pub fn delete_to_next_word_boundary(
2221        &mut self,
2222        _: &DeleteToNextWordBoundary,
2223        cx: &mut ViewContext<Self>,
2224    ) {
2225        self.start_transaction(cx);
2226        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2227        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
2228        for selection in &mut selections {
2229            if selection.is_empty() {
2230                let head = selection.head().to_display_point(&display_map);
2231                let cursor =
2232                    movement::next_word_boundary(&display_map, head).to_point(&display_map);
2233                selection.set_head(cursor);
2234                selection.goal = SelectionGoal::None;
2235            }
2236        }
2237        self.update_selections(selections, Some(Autoscroll::Fit), cx);
2238        self.insert("", cx);
2239        self.end_transaction(cx);
2240    }
2241
2242    pub fn move_to_beginning_of_line(
2243        &mut self,
2244        _: &MoveToBeginningOfLine,
2245        cx: &mut ViewContext<Self>,
2246    ) {
2247        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2248        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
2249        for selection in &mut selections {
2250            let head = selection.head().to_display_point(&display_map);
2251            let new_head = movement::line_beginning(&display_map, head, true);
2252            let cursor = new_head.to_point(&display_map);
2253            selection.start = cursor;
2254            selection.end = cursor;
2255            selection.reversed = false;
2256            selection.goal = SelectionGoal::None;
2257        }
2258        self.update_selections(selections, Some(Autoscroll::Fit), cx);
2259    }
2260
2261    pub fn select_to_beginning_of_line(
2262        &mut self,
2263        SelectToBeginningOfLine(toggle_indent): &SelectToBeginningOfLine,
2264        cx: &mut ViewContext<Self>,
2265    ) {
2266        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2267        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
2268        for selection in &mut selections {
2269            let head = selection.head().to_display_point(&display_map);
2270            let new_head = movement::line_beginning(&display_map, head, *toggle_indent);
2271            selection.set_head(new_head.to_point(&display_map));
2272            selection.goal = SelectionGoal::None;
2273        }
2274        self.update_selections(selections, Some(Autoscroll::Fit), cx);
2275    }
2276
2277    pub fn delete_to_beginning_of_line(
2278        &mut self,
2279        _: &DeleteToBeginningOfLine,
2280        cx: &mut ViewContext<Self>,
2281    ) {
2282        self.start_transaction(cx);
2283        self.select_to_beginning_of_line(&SelectToBeginningOfLine(false), cx);
2284        self.backspace(&Backspace, cx);
2285        self.end_transaction(cx);
2286    }
2287
2288    pub fn move_to_end_of_line(&mut self, _: &MoveToEndOfLine, cx: &mut ViewContext<Self>) {
2289        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2290        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
2291        {
2292            for selection in &mut selections {
2293                let head = selection.head().to_display_point(&display_map);
2294                let new_head = movement::line_end(&display_map, head);
2295                let anchor = new_head.to_point(&display_map);
2296                selection.start = anchor.clone();
2297                selection.end = anchor;
2298                selection.reversed = false;
2299                selection.goal = SelectionGoal::None;
2300            }
2301        }
2302        self.update_selections(selections, Some(Autoscroll::Fit), cx);
2303    }
2304
2305    pub fn select_to_end_of_line(&mut self, _: &SelectToEndOfLine, cx: &mut ViewContext<Self>) {
2306        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2307        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
2308        for selection in &mut selections {
2309            let head = selection.head().to_display_point(&display_map);
2310            let new_head = movement::line_end(&display_map, head);
2311            selection.set_head(new_head.to_point(&display_map));
2312            selection.goal = SelectionGoal::None;
2313        }
2314        self.update_selections(selections, Some(Autoscroll::Fit), cx);
2315    }
2316
2317    pub fn delete_to_end_of_line(&mut self, _: &DeleteToEndOfLine, cx: &mut ViewContext<Self>) {
2318        self.start_transaction(cx);
2319        self.select_to_end_of_line(&SelectToEndOfLine, cx);
2320        self.delete(&Delete, cx);
2321        self.end_transaction(cx);
2322    }
2323
2324    pub fn cut_to_end_of_line(&mut self, _: &CutToEndOfLine, cx: &mut ViewContext<Self>) {
2325        self.start_transaction(cx);
2326        self.select_to_end_of_line(&SelectToEndOfLine, cx);
2327        self.cut(&Cut, cx);
2328        self.end_transaction(cx);
2329    }
2330
2331    pub fn move_to_beginning(&mut self, _: &MoveToBeginning, cx: &mut ViewContext<Self>) {
2332        let selection = Selection {
2333            id: post_inc(&mut self.next_selection_id),
2334            start: 0,
2335            end: 0,
2336            reversed: false,
2337            goal: SelectionGoal::None,
2338        };
2339        self.update_selections(vec![selection], Some(Autoscroll::Fit), cx);
2340    }
2341
2342    pub fn select_to_beginning(&mut self, _: &SelectToBeginning, cx: &mut ViewContext<Self>) {
2343        let mut selection = self.selections::<Point>(cx).last().unwrap().clone();
2344        selection.set_head(Point::zero());
2345        self.update_selections(vec![selection], Some(Autoscroll::Fit), cx);
2346    }
2347
2348    pub fn move_to_end(&mut self, _: &MoveToEnd, cx: &mut ViewContext<Self>) {
2349        let buffer = self.buffer.read(cx);
2350        let cursor = buffer.len();
2351        let selection = Selection {
2352            id: post_inc(&mut self.next_selection_id),
2353            start: cursor,
2354            end: cursor,
2355            reversed: false,
2356            goal: SelectionGoal::None,
2357        };
2358        self.update_selections(vec![selection], Some(Autoscroll::Fit), cx);
2359    }
2360
2361    pub fn select_to_end(&mut self, _: &SelectToEnd, cx: &mut ViewContext<Self>) {
2362        let mut selection = self.selections::<usize>(cx).last().unwrap().clone();
2363        selection.set_head(self.buffer.read(cx).len());
2364        self.update_selections(vec![selection], Some(Autoscroll::Fit), cx);
2365    }
2366
2367    pub fn select_all(&mut self, _: &SelectAll, cx: &mut ViewContext<Self>) {
2368        let selection = Selection {
2369            id: post_inc(&mut self.next_selection_id),
2370            start: 0,
2371            end: self.buffer.read(cx).len(),
2372            reversed: false,
2373            goal: SelectionGoal::None,
2374        };
2375        self.update_selections(vec![selection], None, cx);
2376    }
2377
2378    pub fn select_line(&mut self, _: &SelectLine, cx: &mut ViewContext<Self>) {
2379        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2380        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
2381        let buffer = self.buffer.read(cx);
2382        let max_point = buffer.max_point();
2383        for selection in &mut selections {
2384            let rows = selection.spanned_rows(true, &display_map).buffer_rows;
2385            selection.start = Point::new(rows.start, 0);
2386            selection.end = cmp::min(max_point, Point::new(rows.end, 0));
2387            selection.reversed = false;
2388        }
2389        self.update_selections(selections, Some(Autoscroll::Fit), cx);
2390    }
2391
2392    pub fn split_selection_into_lines(
2393        &mut self,
2394        _: &SplitSelectionIntoLines,
2395        cx: &mut ViewContext<Self>,
2396    ) {
2397        let selections = self.selections::<Point>(cx).collect::<Vec<_>>();
2398        let buffer = self.buffer.read(cx);
2399
2400        let mut to_unfold = Vec::new();
2401        let mut new_selections = Vec::new();
2402        for selection in selections.iter() {
2403            for row in selection.start.row..selection.end.row {
2404                let cursor = Point::new(row, buffer.line_len(row));
2405                new_selections.push(Selection {
2406                    id: post_inc(&mut self.next_selection_id),
2407                    start: cursor,
2408                    end: cursor,
2409                    reversed: false,
2410                    goal: SelectionGoal::None,
2411                });
2412            }
2413            new_selections.push(Selection {
2414                id: selection.id,
2415                start: selection.end,
2416                end: selection.end,
2417                reversed: false,
2418                goal: SelectionGoal::None,
2419            });
2420            to_unfold.push(selection.start..selection.end);
2421        }
2422        self.unfold_ranges(to_unfold, cx);
2423        self.update_selections(new_selections, Some(Autoscroll::Fit), cx);
2424    }
2425
2426    pub fn add_selection_above(&mut self, _: &AddSelectionAbove, cx: &mut ViewContext<Self>) {
2427        self.add_selection(true, cx);
2428    }
2429
2430    pub fn add_selection_below(&mut self, _: &AddSelectionBelow, cx: &mut ViewContext<Self>) {
2431        self.add_selection(false, cx);
2432    }
2433
2434    fn add_selection(&mut self, above: bool, cx: &mut ViewContext<Self>) {
2435        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2436        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
2437        let mut state = self.add_selections_state.take().unwrap_or_else(|| {
2438            let oldest_selection = selections.iter().min_by_key(|s| s.id).unwrap().clone();
2439            let range = oldest_selection.display_range(&display_map).sorted();
2440            let columns = cmp::min(range.start.column(), range.end.column())
2441                ..cmp::max(range.start.column(), range.end.column());
2442
2443            selections.clear();
2444            let mut stack = Vec::new();
2445            for row in range.start.row()..=range.end.row() {
2446                if let Some(selection) = self.build_columnar_selection(
2447                    &display_map,
2448                    row,
2449                    &columns,
2450                    oldest_selection.reversed,
2451                ) {
2452                    stack.push(selection.id);
2453                    selections.push(selection);
2454                }
2455            }
2456
2457            if above {
2458                stack.reverse();
2459            }
2460
2461            AddSelectionsState { above, stack }
2462        });
2463
2464        let last_added_selection = *state.stack.last().unwrap();
2465        let mut new_selections = Vec::new();
2466        if above == state.above {
2467            let end_row = if above {
2468                0
2469            } else {
2470                display_map.max_point().row()
2471            };
2472
2473            'outer: for selection in selections {
2474                if selection.id == last_added_selection {
2475                    let range = selection.display_range(&display_map).sorted();
2476                    debug_assert_eq!(range.start.row(), range.end.row());
2477                    let mut row = range.start.row();
2478                    let columns = if let SelectionGoal::ColumnRange { start, end } = selection.goal
2479                    {
2480                        start..end
2481                    } else {
2482                        cmp::min(range.start.column(), range.end.column())
2483                            ..cmp::max(range.start.column(), range.end.column())
2484                    };
2485
2486                    while row != end_row {
2487                        if above {
2488                            row -= 1;
2489                        } else {
2490                            row += 1;
2491                        }
2492
2493                        if let Some(new_selection) = self.build_columnar_selection(
2494                            &display_map,
2495                            row,
2496                            &columns,
2497                            selection.reversed,
2498                        ) {
2499                            state.stack.push(new_selection.id);
2500                            if above {
2501                                new_selections.push(new_selection);
2502                                new_selections.push(selection);
2503                            } else {
2504                                new_selections.push(selection);
2505                                new_selections.push(new_selection);
2506                            }
2507
2508                            continue 'outer;
2509                        }
2510                    }
2511                }
2512
2513                new_selections.push(selection);
2514            }
2515        } else {
2516            new_selections = selections;
2517            new_selections.retain(|s| s.id != last_added_selection);
2518            state.stack.pop();
2519        }
2520
2521        self.update_selections(new_selections, Some(Autoscroll::Fit), cx);
2522        if state.stack.len() > 1 {
2523            self.add_selections_state = Some(state);
2524        }
2525    }
2526
2527    pub fn select_next(&mut self, action: &SelectNext, cx: &mut ViewContext<Self>) {
2528        let replace_newest = action.0;
2529        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2530        let buffer = &display_map.buffer_snapshot;
2531        let mut selections = self.selections::<usize>(cx).collect::<Vec<_>>();
2532        if let Some(mut select_next_state) = self.select_next_state.take() {
2533            let query = &select_next_state.query;
2534            if !select_next_state.done {
2535                let first_selection = selections.iter().min_by_key(|s| s.id).unwrap();
2536                let last_selection = selections.iter().max_by_key(|s| s.id).unwrap();
2537                let mut next_selected_range = None;
2538
2539                let bytes_after_last_selection =
2540                    buffer.bytes_in_range(last_selection.end..buffer.len());
2541                let bytes_before_first_selection = buffer.bytes_in_range(0..first_selection.start);
2542                let query_matches = query
2543                    .stream_find_iter(bytes_after_last_selection)
2544                    .map(|result| (last_selection.end, result))
2545                    .chain(
2546                        query
2547                            .stream_find_iter(bytes_before_first_selection)
2548                            .map(|result| (0, result)),
2549                    );
2550                for (start_offset, query_match) in query_matches {
2551                    let query_match = query_match.unwrap(); // can only fail due to I/O
2552                    let offset_range =
2553                        start_offset + query_match.start()..start_offset + query_match.end();
2554                    let display_range = offset_range.start.to_display_point(&display_map)
2555                        ..offset_range.end.to_display_point(&display_map);
2556
2557                    if !select_next_state.wordwise
2558                        || (!movement::is_inside_word(&display_map, display_range.start)
2559                            && !movement::is_inside_word(&display_map, display_range.end))
2560                    {
2561                        next_selected_range = Some(offset_range);
2562                        break;
2563                    }
2564                }
2565
2566                if let Some(next_selected_range) = next_selected_range {
2567                    if replace_newest {
2568                        if let Some(newest_id) =
2569                            selections.iter().max_by_key(|s| s.id).map(|s| s.id)
2570                        {
2571                            selections.retain(|s| s.id != newest_id);
2572                        }
2573                    }
2574                    selections.push(Selection {
2575                        id: post_inc(&mut self.next_selection_id),
2576                        start: next_selected_range.start,
2577                        end: next_selected_range.end,
2578                        reversed: false,
2579                        goal: SelectionGoal::None,
2580                    });
2581                    selections.sort_unstable_by_key(|s| s.start);
2582                    self.update_selections(selections, Some(Autoscroll::Newest), cx);
2583                } else {
2584                    select_next_state.done = true;
2585                }
2586            }
2587
2588            self.select_next_state = Some(select_next_state);
2589        } else if selections.len() == 1 {
2590            let selection = selections.last_mut().unwrap();
2591            if selection.start == selection.end {
2592                let word_range = movement::surrounding_word(
2593                    &display_map,
2594                    selection.start.to_display_point(&display_map),
2595                );
2596                selection.start = word_range.start.to_offset(&display_map, Bias::Left);
2597                selection.end = word_range.end.to_offset(&display_map, Bias::Left);
2598                selection.goal = SelectionGoal::None;
2599                selection.reversed = false;
2600
2601                let query = buffer
2602                    .text_for_range(selection.start..selection.end)
2603                    .collect::<String>();
2604                let select_state = SelectNextState {
2605                    query: AhoCorasick::new_auto_configured(&[query]),
2606                    wordwise: true,
2607                    done: false,
2608                };
2609                self.update_selections(selections, Some(Autoscroll::Newest), cx);
2610                self.select_next_state = Some(select_state);
2611            } else {
2612                let query = buffer
2613                    .text_for_range(selection.start..selection.end)
2614                    .collect::<String>();
2615                self.select_next_state = Some(SelectNextState {
2616                    query: AhoCorasick::new_auto_configured(&[query]),
2617                    wordwise: false,
2618                    done: false,
2619                });
2620                self.select_next(action, cx);
2621            }
2622        }
2623    }
2624
2625    pub fn toggle_comments(&mut self, _: &ToggleComments, cx: &mut ViewContext<Self>) {
2626        // Get the line comment prefix. Split its trailing whitespace into a separate string,
2627        // as that portion won't be used for detecting if a line is a comment.
2628        let full_comment_prefix =
2629            if let Some(prefix) = self.language(cx).and_then(|l| l.line_comment_prefix()) {
2630                prefix.to_string()
2631            } else {
2632                return;
2633            };
2634        let comment_prefix = full_comment_prefix.trim_end_matches(' ');
2635        let comment_prefix_whitespace = &full_comment_prefix[comment_prefix.len()..];
2636
2637        self.start_transaction(cx);
2638        let mut selections = self.selections::<Point>(cx).collect::<Vec<_>>();
2639        let mut all_selection_lines_are_comments = true;
2640        let mut edit_ranges = Vec::new();
2641        let mut last_toggled_row = None;
2642        self.buffer.update(cx, |buffer, cx| {
2643            for selection in &mut selections {
2644                edit_ranges.clear();
2645
2646                let end_row =
2647                    if selection.end.row > selection.start.row && selection.end.column == 0 {
2648                        selection.end.row
2649                    } else {
2650                        selection.end.row + 1
2651                    };
2652
2653                for row in selection.start.row..end_row {
2654                    // If multiple selections contain a given row, avoid processing that
2655                    // row more than once.
2656                    if last_toggled_row == Some(row) {
2657                        continue;
2658                    } else {
2659                        last_toggled_row = Some(row);
2660                    }
2661
2662                    if buffer.is_line_blank(row) {
2663                        continue;
2664                    }
2665
2666                    let start = Point::new(row, buffer.indent_column_for_line(row));
2667                    let mut line_bytes = buffer
2668                        .bytes_in_range(start..buffer.max_point())
2669                        .flatten()
2670                        .copied();
2671
2672                    // If this line currently begins with the line comment prefix, then record
2673                    // the range containing the prefix.
2674                    if all_selection_lines_are_comments
2675                        && line_bytes
2676                            .by_ref()
2677                            .take(comment_prefix.len())
2678                            .eq(comment_prefix.bytes())
2679                    {
2680                        // Include any whitespace that matches the comment prefix.
2681                        let matching_whitespace_len = line_bytes
2682                            .zip(comment_prefix_whitespace.bytes())
2683                            .take_while(|(a, b)| a == b)
2684                            .count() as u32;
2685                        let end = Point::new(
2686                            row,
2687                            start.column + comment_prefix.len() as u32 + matching_whitespace_len,
2688                        );
2689                        edit_ranges.push(start..end);
2690                    }
2691                    // If this line does not begin with the line comment prefix, then record
2692                    // the position where the prefix should be inserted.
2693                    else {
2694                        all_selection_lines_are_comments = false;
2695                        edit_ranges.push(start..start);
2696                    }
2697                }
2698
2699                if !edit_ranges.is_empty() {
2700                    if all_selection_lines_are_comments {
2701                        buffer.edit(edit_ranges.iter().cloned(), "", cx);
2702                    } else {
2703                        let min_column = edit_ranges.iter().map(|r| r.start.column).min().unwrap();
2704                        let edit_ranges = edit_ranges.iter().map(|range| {
2705                            let position = Point::new(range.start.row, min_column);
2706                            position..position
2707                        });
2708                        buffer.edit(edit_ranges, &full_comment_prefix, cx);
2709                    }
2710                }
2711            }
2712        });
2713
2714        self.update_selections(
2715            self.selections::<usize>(cx).collect(),
2716            Some(Autoscroll::Fit),
2717            cx,
2718        );
2719        self.end_transaction(cx);
2720    }
2721
2722    pub fn select_larger_syntax_node(
2723        &mut self,
2724        _: &SelectLargerSyntaxNode,
2725        cx: &mut ViewContext<Self>,
2726    ) {
2727        let old_selections = self.selections::<usize>(cx).collect::<Box<_>>();
2728        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
2729        let buffer = self.buffer.read(cx);
2730
2731        let mut stack = mem::take(&mut self.select_larger_syntax_node_stack);
2732        let mut selected_larger_node = false;
2733        let mut new_selections = old_selections
2734            .iter()
2735            .map(|selection| {
2736                let old_range = selection.start..selection.end;
2737                let mut new_range = old_range.clone();
2738                while let Some(containing_range) =
2739                    buffer.range_for_syntax_ancestor(new_range.clone())
2740                {
2741                    new_range = containing_range;
2742                    if !display_map.intersects_fold(new_range.start)
2743                        && !display_map.intersects_fold(new_range.end)
2744                    {
2745                        break;
2746                    }
2747                }
2748
2749                selected_larger_node |= new_range != old_range;
2750                Selection {
2751                    id: selection.id,
2752                    start: new_range.start,
2753                    end: new_range.end,
2754                    goal: SelectionGoal::None,
2755                    reversed: selection.reversed,
2756                }
2757            })
2758            .collect::<Vec<_>>();
2759
2760        if selected_larger_node {
2761            stack.push(old_selections);
2762            new_selections.sort_unstable_by_key(|selection| selection.start);
2763            self.update_selections(new_selections, Some(Autoscroll::Fit), cx);
2764        }
2765        self.select_larger_syntax_node_stack = stack;
2766    }
2767
2768    pub fn select_smaller_syntax_node(
2769        &mut self,
2770        _: &SelectSmallerSyntaxNode,
2771        cx: &mut ViewContext<Self>,
2772    ) {
2773        let mut stack = mem::take(&mut self.select_larger_syntax_node_stack);
2774        if let Some(selections) = stack.pop() {
2775            self.update_selections(selections.to_vec(), Some(Autoscroll::Fit), cx);
2776        }
2777        self.select_larger_syntax_node_stack = stack;
2778    }
2779
2780    pub fn move_to_enclosing_bracket(
2781        &mut self,
2782        _: &MoveToEnclosingBracket,
2783        cx: &mut ViewContext<Self>,
2784    ) {
2785        let mut selections = self.selections::<usize>(cx).collect::<Vec<_>>();
2786        let buffer = self.buffer.read(cx.as_ref());
2787        for selection in &mut selections {
2788            if let Some((open_range, close_range)) =
2789                buffer.enclosing_bracket_ranges(selection.start..selection.end)
2790            {
2791                let close_range = close_range.to_inclusive();
2792                let destination = if close_range.contains(&selection.start)
2793                    && close_range.contains(&selection.end)
2794                {
2795                    open_range.end
2796                } else {
2797                    *close_range.start()
2798                };
2799                selection.start = destination;
2800                selection.end = destination;
2801            }
2802        }
2803
2804        self.update_selections(selections, Some(Autoscroll::Fit), cx);
2805    }
2806
2807    pub fn show_next_diagnostic(&mut self, _: &ShowNextDiagnostic, cx: &mut ViewContext<Self>) {
2808        let selection = self.newest_selection::<usize>(cx);
2809        let buffer = self.buffer.read(cx.as_ref());
2810        let active_primary_range = self.active_diagnostics.as_ref().map(|active_diagnostics| {
2811            active_diagnostics
2812                .primary_range
2813                .to_offset(buffer)
2814                .to_inclusive()
2815        });
2816        let mut search_start = if let Some(active_primary_range) = active_primary_range.as_ref() {
2817            if active_primary_range.contains(&selection.head()) {
2818                *active_primary_range.end()
2819            } else {
2820                selection.head()
2821            }
2822        } else {
2823            selection.head()
2824        };
2825
2826        loop {
2827            let next_group = buffer
2828                .diagnostics_in_range(search_start..buffer.len())
2829                .find_map(|entry| {
2830                    let range = entry.range.to_offset(buffer);
2831                    if entry.diagnostic.is_primary
2832                        && !range.is_empty()
2833                        && Some(range.end) != active_primary_range.as_ref().map(|r| *r.end())
2834                    {
2835                        Some((range, entry.diagnostic.group_id))
2836                    } else {
2837                        None
2838                    }
2839                });
2840
2841            if let Some((primary_range, group_id)) = next_group {
2842                self.activate_diagnostics(group_id, cx);
2843                self.update_selections(
2844                    vec![Selection {
2845                        id: selection.id,
2846                        start: primary_range.start,
2847                        end: primary_range.start,
2848                        reversed: false,
2849                        goal: SelectionGoal::None,
2850                    }],
2851                    Some(Autoscroll::Center),
2852                    cx,
2853                );
2854                break;
2855            } else if search_start == 0 {
2856                break;
2857            } else {
2858                // Cycle around to the start of the buffer.
2859                search_start = 0;
2860            }
2861        }
2862    }
2863
2864    fn refresh_active_diagnostics(&mut self, cx: &mut ViewContext<Editor>) {
2865        if let Some(active_diagnostics) = self.active_diagnostics.as_mut() {
2866            let buffer = self.buffer.read(cx);
2867            let primary_range_start = active_diagnostics.primary_range.start.to_offset(buffer);
2868            let is_valid = buffer
2869                .diagnostics_in_range(active_diagnostics.primary_range.clone())
2870                .any(|entry| {
2871                    let range = entry.range.to_offset(buffer);
2872                    entry.diagnostic.is_primary
2873                        && !range.is_empty()
2874                        && range.start == primary_range_start
2875                        && entry.diagnostic.message == active_diagnostics.primary_message
2876                });
2877
2878            if is_valid != active_diagnostics.is_valid {
2879                active_diagnostics.is_valid = is_valid;
2880                let mut new_styles = HashMap::new();
2881                for (block_id, diagnostic) in &active_diagnostics.blocks {
2882                    let build_settings = self.build_settings.clone();
2883                    let diagnostic = diagnostic.clone();
2884                    new_styles.insert(*block_id, move |cx: &BlockContext| {
2885                        let diagnostic = diagnostic.clone();
2886                        let settings = build_settings.borrow()(cx.cx);
2887                        render_diagnostic(diagnostic, &settings.style, is_valid, cx.anchor_x)
2888                    });
2889                }
2890                self.display_map
2891                    .update(cx, |display_map, _| display_map.replace_blocks(new_styles));
2892            }
2893        }
2894    }
2895
2896    fn activate_diagnostics(&mut self, group_id: usize, cx: &mut ViewContext<Self>) {
2897        self.dismiss_diagnostics(cx);
2898        self.active_diagnostics = self.display_map.update(cx, |display_map, cx| {
2899            let buffer = self.buffer.read(cx);
2900
2901            let mut primary_range = None;
2902            let mut primary_message = None;
2903            let mut group_end = Point::zero();
2904            let diagnostic_group = buffer
2905                .diagnostic_group(group_id)
2906                .map(|entry| {
2907                    let range = entry.range.to_point(buffer);
2908                    if range.end > group_end {
2909                        group_end = range.end;
2910                    }
2911                    if entry.diagnostic.is_primary {
2912                        primary_range = Some(range.clone());
2913                        primary_message = Some(entry.diagnostic.message.clone());
2914                    }
2915                    (range, entry.diagnostic.clone())
2916                })
2917                .collect::<Vec<_>>();
2918            let primary_range = primary_range.unwrap();
2919            let primary_message = primary_message.unwrap();
2920            let primary_range =
2921                buffer.anchor_after(primary_range.start)..buffer.anchor_before(primary_range.end);
2922
2923            let blocks = display_map
2924                .insert_blocks(
2925                    diagnostic_group.iter().map(|(range, diagnostic)| {
2926                        let build_settings = self.build_settings.clone();
2927                        let diagnostic = diagnostic.clone();
2928                        let message_height = diagnostic.message.lines().count() as u8;
2929
2930                        BlockProperties {
2931                            position: range.start,
2932                            height: message_height,
2933                            render: Arc::new(move |cx| {
2934                                let settings = build_settings.borrow()(cx.cx);
2935                                let diagnostic = diagnostic.clone();
2936                                render_diagnostic(diagnostic, &settings.style, true, cx.anchor_x)
2937                            }),
2938                            disposition: BlockDisposition::Below,
2939                        }
2940                    }),
2941                    cx,
2942                )
2943                .into_iter()
2944                .zip(
2945                    diagnostic_group
2946                        .into_iter()
2947                        .map(|(_, diagnostic)| diagnostic),
2948                )
2949                .collect();
2950
2951            Some(ActiveDiagnosticGroup {
2952                primary_range,
2953                primary_message,
2954                blocks,
2955                is_valid: true,
2956            })
2957        });
2958    }
2959
2960    fn dismiss_diagnostics(&mut self, cx: &mut ViewContext<Self>) {
2961        if let Some(active_diagnostic_group) = self.active_diagnostics.take() {
2962            self.display_map.update(cx, |display_map, cx| {
2963                display_map.remove_blocks(active_diagnostic_group.blocks.into_keys().collect(), cx);
2964            });
2965            cx.notify();
2966        }
2967    }
2968
2969    fn build_columnar_selection(
2970        &mut self,
2971        display_map: &DisplayMapSnapshot,
2972        row: u32,
2973        columns: &Range<u32>,
2974        reversed: bool,
2975    ) -> Option<Selection<Point>> {
2976        let is_empty = columns.start == columns.end;
2977        let line_len = display_map.line_len(row);
2978        if columns.start < line_len || (is_empty && columns.start == line_len) {
2979            let start = DisplayPoint::new(row, columns.start);
2980            let end = DisplayPoint::new(row, cmp::min(columns.end, line_len));
2981            Some(Selection {
2982                id: post_inc(&mut self.next_selection_id),
2983                start: start.to_point(display_map),
2984                end: end.to_point(display_map),
2985                reversed,
2986                goal: SelectionGoal::ColumnRange {
2987                    start: columns.start,
2988                    end: columns.end,
2989                },
2990            })
2991        } else {
2992            None
2993        }
2994    }
2995
2996    pub fn active_selection_sets<'a>(
2997        &'a self,
2998        cx: &'a AppContext,
2999    ) -> impl 'a + Iterator<Item = SelectionSetId> {
3000        let buffer = self.buffer.read(cx);
3001        let replica_id = buffer.replica_id();
3002        buffer
3003            .selection_sets()
3004            .filter(move |(set_id, set)| {
3005                set.active && (set_id.replica_id != replica_id || **set_id == self.selection_set_id)
3006            })
3007            .map(|(set_id, _)| *set_id)
3008    }
3009
3010    pub fn intersecting_selections<'a>(
3011        &'a self,
3012        set_id: SelectionSetId,
3013        range: Range<DisplayPoint>,
3014        cx: &'a mut MutableAppContext,
3015    ) -> impl 'a + Iterator<Item = Selection<DisplayPoint>> {
3016        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3017        let buffer = self.buffer.read(cx);
3018
3019        let pending_selection = if set_id == self.selection_set_id {
3020            self.pending_selection.as_ref().and_then(|pending| {
3021                let selection_start = pending.selection.start.to_display_point(&display_map);
3022                let selection_end = pending.selection.end.to_display_point(&display_map);
3023                if selection_start <= range.end || selection_end <= range.end {
3024                    Some(Selection {
3025                        id: pending.selection.id,
3026                        start: selection_start,
3027                        end: selection_end,
3028                        reversed: pending.selection.reversed,
3029                        goal: pending.selection.goal,
3030                    })
3031                } else {
3032                    None
3033                }
3034            })
3035        } else {
3036            None
3037        };
3038
3039        let range = (range.start.to_offset(&display_map, Bias::Left), Bias::Left)
3040            ..(range.end.to_offset(&display_map, Bias::Left), Bias::Right);
3041        let selections = self
3042            .buffer
3043            .read(cx)
3044            .selection_set(set_id)
3045            .unwrap()
3046            .intersecting_selections::<Point, _>(range, buffer);
3047
3048        selections
3049            .map(move |s| Selection {
3050                id: s.id,
3051                start: s.start.to_display_point(&display_map),
3052                end: s.end.to_display_point(&display_map),
3053                reversed: s.reversed,
3054                goal: s.goal,
3055            })
3056            .chain(pending_selection)
3057    }
3058
3059    pub fn selections<'a, D>(&self, cx: &'a AppContext) -> impl 'a + Iterator<Item = Selection<D>>
3060    where
3061        D: 'a + TextDimension<'a> + Ord,
3062    {
3063        let buffer = self.buffer.read(cx);
3064        let mut selections = self.selection_set(cx).selections::<D>(buffer).peekable();
3065        let mut pending_selection = self.pending_selection(cx);
3066        iter::from_fn(move || {
3067            if let Some(pending) = pending_selection.as_mut() {
3068                while let Some(next_selection) = selections.peek() {
3069                    if pending.start <= next_selection.end && pending.end >= next_selection.start {
3070                        let next_selection = selections.next().unwrap();
3071                        if next_selection.start < pending.start {
3072                            pending.start = next_selection.start;
3073                        }
3074                        if next_selection.end > pending.end {
3075                            pending.end = next_selection.end;
3076                        }
3077                    } else if next_selection.end < pending.start {
3078                        return selections.next();
3079                    } else {
3080                        break;
3081                    }
3082                }
3083
3084                pending_selection.take()
3085            } else {
3086                selections.next()
3087            }
3088        })
3089    }
3090
3091    fn pending_selection<'a, D>(&self, cx: &'a AppContext) -> Option<Selection<D>>
3092    where
3093        D: 'a + TextDimension<'a>,
3094    {
3095        let buffer = self.buffer.read(cx);
3096        self.pending_selection.as_ref().map(|pending| Selection {
3097            id: pending.selection.id,
3098            start: pending.selection.start.summary::<D>(buffer),
3099            end: pending.selection.end.summary::<D>(buffer),
3100            reversed: pending.selection.reversed,
3101            goal: pending.selection.goal,
3102        })
3103    }
3104
3105    fn selection_count<'a>(&self, cx: &'a AppContext) -> usize {
3106        let mut selection_count = self.selection_set(cx).len();
3107        if self.pending_selection.is_some() {
3108            selection_count += 1;
3109        }
3110        selection_count
3111    }
3112
3113    pub fn oldest_selection<'a, T>(&self, cx: &'a AppContext) -> Selection<T>
3114    where
3115        T: 'a + TextDimension<'a>,
3116    {
3117        let buffer = self.buffer.read(cx);
3118        self.selection_set(cx)
3119            .oldest_selection(buffer)
3120            .or_else(|| self.pending_selection(cx))
3121            .unwrap()
3122    }
3123
3124    pub fn newest_selection<'a, T>(&self, cx: &'a AppContext) -> Selection<T>
3125    where
3126        T: 'a + TextDimension<'a>,
3127    {
3128        let buffer = self.buffer.read(cx);
3129        self.pending_selection(cx)
3130            .or_else(|| self.selection_set(cx).newest_selection(buffer))
3131            .unwrap()
3132    }
3133
3134    fn selection_set<'a>(&self, cx: &'a AppContext) -> &'a SelectionSet {
3135        self.buffer
3136            .read(cx)
3137            .selection_set(self.selection_set_id)
3138            .unwrap()
3139    }
3140
3141    pub fn update_selections<T>(
3142        &mut self,
3143        mut selections: Vec<Selection<T>>,
3144        autoscroll: Option<Autoscroll>,
3145        cx: &mut ViewContext<Self>,
3146    ) where
3147        T: ToOffset + ToPoint + Ord + std::marker::Copy + std::fmt::Debug,
3148    {
3149        // Merge overlapping selections.
3150        let buffer = self.buffer.read(cx);
3151        let mut i = 1;
3152        while i < selections.len() {
3153            if selections[i - 1].end >= selections[i].start {
3154                let removed = selections.remove(i);
3155                if removed.start < selections[i - 1].start {
3156                    selections[i - 1].start = removed.start;
3157                }
3158                if removed.end > selections[i - 1].end {
3159                    selections[i - 1].end = removed.end;
3160                }
3161            } else {
3162                i += 1;
3163            }
3164        }
3165
3166        self.pending_selection = None;
3167        self.add_selections_state = None;
3168        self.select_next_state = None;
3169        self.select_larger_syntax_node_stack.clear();
3170        while let Some(autoclose_pair) = self.autoclose_stack.last() {
3171            let all_selections_inside_autoclose_ranges =
3172                if selections.len() == autoclose_pair.ranges.len() {
3173                    selections
3174                        .iter()
3175                        .zip(autoclose_pair.ranges.iter().map(|r| r.to_point(buffer)))
3176                        .all(|(selection, autoclose_range)| {
3177                            let head = selection.head().to_point(&*buffer);
3178                            autoclose_range.start <= head && autoclose_range.end >= head
3179                        })
3180                } else {
3181                    false
3182                };
3183
3184            if all_selections_inside_autoclose_ranges {
3185                break;
3186            } else {
3187                self.autoclose_stack.pop();
3188            }
3189        }
3190
3191        if let Some(autoscroll) = autoscroll {
3192            self.request_autoscroll(autoscroll, cx);
3193        }
3194        self.pause_cursor_blinking(cx);
3195
3196        self.buffer.update(cx, |buffer, cx| {
3197            buffer
3198                .update_selection_set(self.selection_set_id, &selections, cx)
3199                .unwrap();
3200        });
3201    }
3202
3203    fn request_autoscroll(&mut self, autoscroll: Autoscroll, cx: &mut ViewContext<Self>) {
3204        self.autoscroll_request = Some(autoscroll);
3205        cx.notify();
3206    }
3207
3208    fn start_transaction(&mut self, cx: &mut ViewContext<Self>) {
3209        self.end_selection(cx);
3210        self.buffer.update(cx, |buffer, _| {
3211            buffer
3212                .start_transaction(Some(self.selection_set_id))
3213                .unwrap()
3214        });
3215    }
3216
3217    fn end_transaction(&self, cx: &mut ViewContext<Self>) {
3218        self.buffer.update(cx, |buffer, cx| {
3219            buffer
3220                .end_transaction(Some(self.selection_set_id), cx)
3221                .unwrap()
3222        });
3223    }
3224
3225    pub fn page_up(&mut self, _: &PageUp, _: &mut ViewContext<Self>) {
3226        log::info!("Editor::page_up");
3227    }
3228
3229    pub fn page_down(&mut self, _: &PageDown, _: &mut ViewContext<Self>) {
3230        log::info!("Editor::page_down");
3231    }
3232
3233    pub fn fold(&mut self, _: &Fold, cx: &mut ViewContext<Self>) {
3234        let mut fold_ranges = Vec::new();
3235
3236        let selections = self.selections::<Point>(cx).collect::<Vec<_>>();
3237        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3238        for selection in selections {
3239            let range = selection.display_range(&display_map).sorted();
3240            let buffer_start_row = range.start.to_point(&display_map).row;
3241
3242            for row in (0..=range.end.row()).rev() {
3243                if self.is_line_foldable(&display_map, row) && !display_map.is_line_folded(row) {
3244                    let fold_range = self.foldable_range_for_line(&display_map, row);
3245                    if fold_range.end.row >= buffer_start_row {
3246                        fold_ranges.push(fold_range);
3247                        if row <= range.start.row() {
3248                            break;
3249                        }
3250                    }
3251                }
3252            }
3253        }
3254
3255        self.fold_ranges(fold_ranges, cx);
3256    }
3257
3258    pub fn unfold(&mut self, _: &Unfold, cx: &mut ViewContext<Self>) {
3259        let selections = self.selections::<Point>(cx).collect::<Vec<_>>();
3260        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3261        let buffer = self.buffer.read(cx);
3262        let ranges = selections
3263            .iter()
3264            .map(|s| {
3265                let range = s.display_range(&display_map).sorted();
3266                let mut start = range.start.to_point(&display_map);
3267                let mut end = range.end.to_point(&display_map);
3268                start.column = 0;
3269                end.column = buffer.line_len(end.row);
3270                start..end
3271            })
3272            .collect::<Vec<_>>();
3273        self.unfold_ranges(ranges, cx);
3274    }
3275
3276    fn is_line_foldable(&self, display_map: &DisplayMapSnapshot, display_row: u32) -> bool {
3277        let max_point = display_map.max_point();
3278        if display_row >= max_point.row() {
3279            false
3280        } else {
3281            let (start_indent, is_blank) = display_map.line_indent(display_row);
3282            if is_blank {
3283                false
3284            } else {
3285                for display_row in display_row + 1..=max_point.row() {
3286                    let (indent, is_blank) = display_map.line_indent(display_row);
3287                    if !is_blank {
3288                        return indent > start_indent;
3289                    }
3290                }
3291                false
3292            }
3293        }
3294    }
3295
3296    fn foldable_range_for_line(
3297        &self,
3298        display_map: &DisplayMapSnapshot,
3299        start_row: u32,
3300    ) -> Range<Point> {
3301        let max_point = display_map.max_point();
3302
3303        let (start_indent, _) = display_map.line_indent(start_row);
3304        let start = DisplayPoint::new(start_row, display_map.line_len(start_row));
3305        let mut end = None;
3306        for row in start_row + 1..=max_point.row() {
3307            let (indent, is_blank) = display_map.line_indent(row);
3308            if !is_blank && indent <= start_indent {
3309                end = Some(DisplayPoint::new(row - 1, display_map.line_len(row - 1)));
3310                break;
3311            }
3312        }
3313
3314        let end = end.unwrap_or(max_point);
3315        return start.to_point(display_map)..end.to_point(display_map);
3316    }
3317
3318    pub fn fold_selected_ranges(&mut self, _: &FoldSelectedRanges, cx: &mut ViewContext<Self>) {
3319        let selections = self.selections::<Point>(cx);
3320        let ranges = selections.map(|s| s.start..s.end).collect();
3321        self.fold_ranges(ranges, cx);
3322    }
3323
3324    fn fold_ranges<T: ToOffset>(&mut self, ranges: Vec<Range<T>>, cx: &mut ViewContext<Self>) {
3325        if !ranges.is_empty() {
3326            self.display_map.update(cx, |map, cx| map.fold(ranges, cx));
3327            self.request_autoscroll(Autoscroll::Fit, cx);
3328            cx.notify();
3329        }
3330    }
3331
3332    fn unfold_ranges<T: ToOffset>(&mut self, ranges: Vec<Range<T>>, cx: &mut ViewContext<Self>) {
3333        if !ranges.is_empty() {
3334            self.display_map
3335                .update(cx, |map, cx| map.unfold(ranges, cx));
3336            self.request_autoscroll(Autoscroll::Fit, cx);
3337            cx.notify();
3338        }
3339    }
3340
3341    pub fn longest_row(&self, cx: &mut MutableAppContext) -> u32 {
3342        self.display_map
3343            .update(cx, |map, cx| map.snapshot(cx))
3344            .longest_row()
3345    }
3346
3347    pub fn max_point(&self, cx: &mut MutableAppContext) -> DisplayPoint {
3348        self.display_map
3349            .update(cx, |map, cx| map.snapshot(cx))
3350            .max_point()
3351    }
3352
3353    pub fn text(&self, cx: &AppContext) -> String {
3354        self.buffer.read(cx).text()
3355    }
3356
3357    pub fn display_text(&self, cx: &mut MutableAppContext) -> String {
3358        self.display_map
3359            .update(cx, |map, cx| map.snapshot(cx))
3360            .text()
3361    }
3362
3363    pub fn set_wrap_width(&self, width: Option<f32>, cx: &mut MutableAppContext) -> bool {
3364        self.display_map
3365            .update(cx, |map, cx| map.set_wrap_width(width, cx))
3366    }
3367
3368    pub fn set_highlighted_row(&mut self, row: Option<u32>) {
3369        self.highlighted_row = row;
3370    }
3371
3372    pub fn highlighted_row(&mut self) -> Option<u32> {
3373        self.highlighted_row
3374    }
3375
3376    fn next_blink_epoch(&mut self) -> usize {
3377        self.blink_epoch += 1;
3378        self.blink_epoch
3379    }
3380
3381    fn pause_cursor_blinking(&mut self, cx: &mut ViewContext<Self>) {
3382        self.show_local_cursors = true;
3383        cx.notify();
3384
3385        let epoch = self.next_blink_epoch();
3386        cx.spawn(|this, mut cx| {
3387            let this = this.downgrade();
3388            async move {
3389                Timer::after(CURSOR_BLINK_INTERVAL).await;
3390                if let Some(this) = cx.read(|cx| this.upgrade(cx)) {
3391                    this.update(&mut cx, |this, cx| this.resume_cursor_blinking(epoch, cx))
3392                }
3393            }
3394        })
3395        .detach();
3396    }
3397
3398    fn resume_cursor_blinking(&mut self, epoch: usize, cx: &mut ViewContext<Self>) {
3399        if epoch == self.blink_epoch {
3400            self.blinking_paused = false;
3401            self.blink_cursors(epoch, cx);
3402        }
3403    }
3404
3405    fn blink_cursors(&mut self, epoch: usize, cx: &mut ViewContext<Self>) {
3406        if epoch == self.blink_epoch && self.focused && !self.blinking_paused {
3407            self.show_local_cursors = !self.show_local_cursors;
3408            cx.notify();
3409
3410            let epoch = self.next_blink_epoch();
3411            cx.spawn(|this, mut cx| {
3412                let this = this.downgrade();
3413                async move {
3414                    Timer::after(CURSOR_BLINK_INTERVAL).await;
3415                    if let Some(this) = cx.read(|cx| this.upgrade(cx)) {
3416                        this.update(&mut cx, |this, cx| this.blink_cursors(epoch, cx));
3417                    }
3418                }
3419            })
3420            .detach();
3421        }
3422    }
3423
3424    pub fn show_local_cursors(&self) -> bool {
3425        self.show_local_cursors
3426    }
3427
3428    fn on_buffer_changed(&mut self, _: ModelHandle<Buffer>, cx: &mut ViewContext<Self>) {
3429        self.refresh_active_diagnostics(cx);
3430        cx.notify();
3431    }
3432
3433    fn on_buffer_event(
3434        &mut self,
3435        _: ModelHandle<Buffer>,
3436        event: &language::Event,
3437        cx: &mut ViewContext<Self>,
3438    ) {
3439        match event {
3440            language::Event::Edited => cx.emit(Event::Edited),
3441            language::Event::Dirtied => cx.emit(Event::Dirtied),
3442            language::Event::Saved => cx.emit(Event::Saved),
3443            language::Event::FileHandleChanged => cx.emit(Event::FileHandleChanged),
3444            language::Event::Reloaded => cx.emit(Event::FileHandleChanged),
3445            language::Event::Closed => cx.emit(Event::Closed),
3446            _ => {}
3447        }
3448    }
3449
3450    fn on_display_map_changed(&mut self, _: ModelHandle<DisplayMap>, cx: &mut ViewContext<Self>) {
3451        cx.notify();
3452    }
3453}
3454
3455impl Snapshot {
3456    pub fn is_focused(&self) -> bool {
3457        self.is_focused
3458    }
3459
3460    pub fn placeholder_text(&self) -> Option<&Arc<str>> {
3461        self.placeholder_text.as_ref()
3462    }
3463
3464    pub fn scroll_position(&self) -> Vector2F {
3465        compute_scroll_position(
3466            &self.display_snapshot,
3467            self.scroll_position,
3468            &self.scroll_top_anchor,
3469        )
3470    }
3471}
3472
3473impl Deref for Snapshot {
3474    type Target = DisplayMapSnapshot;
3475
3476    fn deref(&self) -> &Self::Target {
3477        &self.display_snapshot
3478    }
3479}
3480
3481impl EditorSettings {
3482    #[cfg(any(test, feature = "test-support"))]
3483    pub fn test(cx: &AppContext) -> Self {
3484        Self {
3485            tab_size: 4,
3486            soft_wrap: SoftWrap::None,
3487            style: {
3488                let font_cache: &gpui::FontCache = cx.font_cache();
3489                let font_family_name = Arc::from("Monaco");
3490                let font_properties = Default::default();
3491                let font_family_id = font_cache.load_family(&[&font_family_name]).unwrap();
3492                let font_id = font_cache
3493                    .select_font(font_family_id, &font_properties)
3494                    .unwrap();
3495                EditorStyle {
3496                    text: gpui::fonts::TextStyle {
3497                        font_family_name,
3498                        font_family_id,
3499                        font_id,
3500                        font_size: 14.,
3501                        color: gpui::color::Color::from_u32(0xff0000ff),
3502                        font_properties,
3503                        underline: None,
3504                    },
3505                    placeholder_text: None,
3506                    background: Default::default(),
3507                    gutter_background: Default::default(),
3508                    active_line_background: Default::default(),
3509                    highlighted_line_background: Default::default(),
3510                    line_number: Default::default(),
3511                    line_number_active: Default::default(),
3512                    selection: Default::default(),
3513                    guest_selections: Default::default(),
3514                    syntax: Default::default(),
3515                    error_diagnostic: Default::default(),
3516                    invalid_error_diagnostic: Default::default(),
3517                    warning_diagnostic: Default::default(),
3518                    invalid_warning_diagnostic: Default::default(),
3519                    information_diagnostic: Default::default(),
3520                    invalid_information_diagnostic: Default::default(),
3521                    hint_diagnostic: Default::default(),
3522                    invalid_hint_diagnostic: Default::default(),
3523                }
3524            },
3525        }
3526    }
3527}
3528
3529fn compute_scroll_position(
3530    snapshot: &DisplayMapSnapshot,
3531    mut scroll_position: Vector2F,
3532    scroll_top_anchor: &Anchor,
3533) -> Vector2F {
3534    let scroll_top = scroll_top_anchor.to_display_point(snapshot).row() as f32;
3535    scroll_position.set_y(scroll_top + scroll_position.y());
3536    scroll_position
3537}
3538
3539pub enum Event {
3540    Activate,
3541    Edited,
3542    Blurred,
3543    Dirtied,
3544    Saved,
3545    FileHandleChanged,
3546    Closed,
3547}
3548
3549impl Entity for Editor {
3550    type Event = Event;
3551
3552    fn release(&mut self, cx: &mut MutableAppContext) {
3553        self.buffer.update(cx, |buffer, cx| {
3554            buffer
3555                .remove_selection_set(self.selection_set_id, cx)
3556                .unwrap();
3557        });
3558    }
3559}
3560
3561impl View for Editor {
3562    fn render(&mut self, cx: &mut RenderContext<Self>) -> ElementBox {
3563        let settings = self.build_settings.borrow_mut()(cx);
3564        self.display_map.update(cx, |map, cx| {
3565            map.set_font(
3566                settings.style.text.font_id,
3567                settings.style.text.font_size,
3568                cx,
3569            )
3570        });
3571        EditorElement::new(self.handle.clone(), settings).boxed()
3572    }
3573
3574    fn ui_name() -> &'static str {
3575        "Editor"
3576    }
3577
3578    fn on_focus(&mut self, cx: &mut ViewContext<Self>) {
3579        self.focused = true;
3580        self.blink_cursors(self.blink_epoch, cx);
3581        self.buffer.update(cx, |buffer, cx| {
3582            buffer
3583                .set_active_selection_set(Some(self.selection_set_id), cx)
3584                .unwrap();
3585        });
3586    }
3587
3588    fn on_blur(&mut self, cx: &mut ViewContext<Self>) {
3589        self.focused = false;
3590        self.show_local_cursors = false;
3591        self.buffer.update(cx, |buffer, cx| {
3592            buffer.set_active_selection_set(None, cx).unwrap();
3593        });
3594        cx.emit(Event::Blurred);
3595        cx.notify();
3596    }
3597
3598    fn keymap_context(&self, _: &AppContext) -> gpui::keymap::Context {
3599        let mut cx = Self::default_keymap_context();
3600        let mode = match self.mode {
3601            EditorMode::SingleLine => "single_line",
3602            EditorMode::AutoHeight { .. } => "auto_height",
3603            EditorMode::Full => "full",
3604        };
3605        cx.map.insert("mode".into(), mode.into());
3606        cx
3607    }
3608}
3609
3610impl SelectionExt for Selection<Point> {
3611    fn display_range(&self, map: &DisplayMapSnapshot) -> Range<DisplayPoint> {
3612        let start = self.start.to_display_point(map);
3613        let end = self.end.to_display_point(map);
3614        if self.reversed {
3615            end..start
3616        } else {
3617            start..end
3618        }
3619    }
3620
3621    fn spanned_rows(
3622        &self,
3623        include_end_if_at_line_start: bool,
3624        map: &DisplayMapSnapshot,
3625    ) -> SpannedRows {
3626        let display_start = self.start.to_display_point(map);
3627        let mut display_end = self.end.to_display_point(map);
3628        if !include_end_if_at_line_start
3629            && display_end.row() != map.max_point().row()
3630            && display_start.row() != display_end.row()
3631            && display_end.column() == 0
3632        {
3633            *display_end.row_mut() -= 1;
3634        }
3635
3636        let (display_start, buffer_start) = map.prev_row_boundary(display_start);
3637        let (display_end, buffer_end) = map.next_row_boundary(display_end);
3638
3639        SpannedRows {
3640            buffer_rows: buffer_start.row..buffer_end.row + 1,
3641            display_rows: display_start.row()..display_end.row() + 1,
3642        }
3643    }
3644}
3645
3646fn render_diagnostic(
3647    diagnostic: Diagnostic,
3648    style: &EditorStyle,
3649    valid: bool,
3650    anchor_x: f32,
3651) -> ElementBox {
3652    let mut text_style = style.text.clone();
3653    text_style.color = diagnostic_style(diagnostic.severity, valid, &style).text;
3654    Text::new(diagnostic.message, text_style)
3655        .contained()
3656        .with_margin_left(anchor_x)
3657        .boxed()
3658}
3659
3660pub fn diagnostic_style(
3661    severity: DiagnosticSeverity,
3662    valid: bool,
3663    style: &EditorStyle,
3664) -> DiagnosticStyle {
3665    match (severity, valid) {
3666        (DiagnosticSeverity::ERROR, true) => style.error_diagnostic,
3667        (DiagnosticSeverity::ERROR, false) => style.invalid_error_diagnostic,
3668        (DiagnosticSeverity::WARNING, true) => style.warning_diagnostic,
3669        (DiagnosticSeverity::WARNING, false) => style.invalid_warning_diagnostic,
3670        (DiagnosticSeverity::INFORMATION, true) => style.information_diagnostic,
3671        (DiagnosticSeverity::INFORMATION, false) => style.invalid_information_diagnostic,
3672        (DiagnosticSeverity::HINT, true) => style.hint_diagnostic,
3673        (DiagnosticSeverity::HINT, false) => style.invalid_hint_diagnostic,
3674        _ => Default::default(),
3675    }
3676}
3677
3678#[cfg(test)]
3679mod tests {
3680    use super::*;
3681    use crate::test::sample_text;
3682    use text::Point;
3683    use unindent::Unindent;
3684
3685    #[gpui::test]
3686    fn test_selection_with_mouse(cx: &mut gpui::MutableAppContext) {
3687        let buffer = cx.add_model(|cx| Buffer::new(0, "aaaaaa\nbbbbbb\ncccccc\ndddddd\n", cx));
3688        let settings = EditorSettings::test(cx);
3689        let (_, editor) =
3690            cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
3691
3692        editor.update(cx, |view, cx| {
3693            view.begin_selection(DisplayPoint::new(2, 2), false, 1, cx);
3694        });
3695
3696        assert_eq!(
3697            editor.update(cx, |view, cx| view.selection_ranges(cx)),
3698            [DisplayPoint::new(2, 2)..DisplayPoint::new(2, 2)]
3699        );
3700
3701        editor.update(cx, |view, cx| {
3702            view.update_selection(DisplayPoint::new(3, 3), 0, Vector2F::zero(), cx);
3703        });
3704
3705        assert_eq!(
3706            editor.update(cx, |view, cx| view.selection_ranges(cx)),
3707            [DisplayPoint::new(2, 2)..DisplayPoint::new(3, 3)]
3708        );
3709
3710        editor.update(cx, |view, cx| {
3711            view.update_selection(DisplayPoint::new(1, 1), 0, Vector2F::zero(), cx);
3712        });
3713
3714        assert_eq!(
3715            editor.update(cx, |view, cx| view.selection_ranges(cx)),
3716            [DisplayPoint::new(2, 2)..DisplayPoint::new(1, 1)]
3717        );
3718
3719        editor.update(cx, |view, cx| {
3720            view.end_selection(cx);
3721            view.update_selection(DisplayPoint::new(3, 3), 0, Vector2F::zero(), cx);
3722        });
3723
3724        assert_eq!(
3725            editor.update(cx, |view, cx| view.selection_ranges(cx)),
3726            [DisplayPoint::new(2, 2)..DisplayPoint::new(1, 1)]
3727        );
3728
3729        editor.update(cx, |view, cx| {
3730            view.begin_selection(DisplayPoint::new(3, 3), true, 1, cx);
3731            view.update_selection(DisplayPoint::new(0, 0), 0, Vector2F::zero(), cx);
3732        });
3733
3734        assert_eq!(
3735            editor.update(cx, |view, cx| view.selection_ranges(cx)),
3736            [
3737                DisplayPoint::new(2, 2)..DisplayPoint::new(1, 1),
3738                DisplayPoint::new(3, 3)..DisplayPoint::new(0, 0)
3739            ]
3740        );
3741
3742        editor.update(cx, |view, cx| {
3743            view.end_selection(cx);
3744        });
3745
3746        assert_eq!(
3747            editor.update(cx, |view, cx| view.selection_ranges(cx)),
3748            [DisplayPoint::new(3, 3)..DisplayPoint::new(0, 0)]
3749        );
3750    }
3751
3752    #[gpui::test]
3753    fn test_canceling_pending_selection(cx: &mut gpui::MutableAppContext) {
3754        let buffer = cx.add_model(|cx| Buffer::new(0, "aaaaaa\nbbbbbb\ncccccc\ndddddd\n", cx));
3755        let settings = EditorSettings::test(cx);
3756        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
3757
3758        view.update(cx, |view, cx| {
3759            view.begin_selection(DisplayPoint::new(2, 2), false, 1, cx);
3760            assert_eq!(
3761                view.selection_ranges(cx),
3762                [DisplayPoint::new(2, 2)..DisplayPoint::new(2, 2)]
3763            );
3764        });
3765
3766        view.update(cx, |view, cx| {
3767            view.update_selection(DisplayPoint::new(3, 3), 0, Vector2F::zero(), cx);
3768            assert_eq!(
3769                view.selection_ranges(cx),
3770                [DisplayPoint::new(2, 2)..DisplayPoint::new(3, 3)]
3771            );
3772        });
3773
3774        view.update(cx, |view, cx| {
3775            view.cancel(&Cancel, cx);
3776            view.update_selection(DisplayPoint::new(1, 1), 0, Vector2F::zero(), cx);
3777            assert_eq!(
3778                view.selection_ranges(cx),
3779                [DisplayPoint::new(2, 2)..DisplayPoint::new(3, 3)]
3780            );
3781        });
3782    }
3783
3784    #[gpui::test]
3785    fn test_cancel(cx: &mut gpui::MutableAppContext) {
3786        let buffer = cx.add_model(|cx| Buffer::new(0, "aaaaaa\nbbbbbb\ncccccc\ndddddd\n", cx));
3787        let settings = EditorSettings::test(cx);
3788        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
3789
3790        view.update(cx, |view, cx| {
3791            view.begin_selection(DisplayPoint::new(3, 4), false, 1, cx);
3792            view.update_selection(DisplayPoint::new(1, 1), 0, Vector2F::zero(), cx);
3793            view.end_selection(cx);
3794
3795            view.begin_selection(DisplayPoint::new(0, 1), true, 1, cx);
3796            view.update_selection(DisplayPoint::new(0, 3), 0, Vector2F::zero(), cx);
3797            view.end_selection(cx);
3798            assert_eq!(
3799                view.selection_ranges(cx),
3800                [
3801                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 3),
3802                    DisplayPoint::new(3, 4)..DisplayPoint::new(1, 1),
3803                ]
3804            );
3805        });
3806
3807        view.update(cx, |view, cx| {
3808            view.cancel(&Cancel, cx);
3809            assert_eq!(
3810                view.selection_ranges(cx),
3811                [DisplayPoint::new(3, 4)..DisplayPoint::new(1, 1)]
3812            );
3813        });
3814
3815        view.update(cx, |view, cx| {
3816            view.cancel(&Cancel, cx);
3817            assert_eq!(
3818                view.selection_ranges(cx),
3819                [DisplayPoint::new(1, 1)..DisplayPoint::new(1, 1)]
3820            );
3821        });
3822    }
3823
3824    #[gpui::test]
3825    fn test_fold(cx: &mut gpui::MutableAppContext) {
3826        let buffer = cx.add_model(|cx| {
3827            Buffer::new(
3828                0,
3829                "
3830                    impl Foo {
3831                        // Hello!
3832
3833                        fn a() {
3834                            1
3835                        }
3836
3837                        fn b() {
3838                            2
3839                        }
3840
3841                        fn c() {
3842                            3
3843                        }
3844                    }
3845                "
3846                .unindent(),
3847                cx,
3848            )
3849        });
3850        let settings = EditorSettings::test(&cx);
3851        let (_, view) = cx.add_window(Default::default(), |cx| {
3852            build_editor(buffer.clone(), settings, cx)
3853        });
3854
3855        view.update(cx, |view, cx| {
3856            view.select_display_ranges(&[DisplayPoint::new(8, 0)..DisplayPoint::new(12, 0)], cx)
3857                .unwrap();
3858            view.fold(&Fold, cx);
3859            assert_eq!(
3860                view.display_text(cx),
3861                "
3862                    impl Foo {
3863                        // Hello!
3864
3865                        fn a() {
3866                            1
3867                        }
3868
3869                        fn b() {…
3870                        }
3871
3872                        fn c() {…
3873                        }
3874                    }
3875                "
3876                .unindent(),
3877            );
3878
3879            view.fold(&Fold, cx);
3880            assert_eq!(
3881                view.display_text(cx),
3882                "
3883                    impl Foo {…
3884                    }
3885                "
3886                .unindent(),
3887            );
3888
3889            view.unfold(&Unfold, cx);
3890            assert_eq!(
3891                view.display_text(cx),
3892                "
3893                    impl Foo {
3894                        // Hello!
3895
3896                        fn a() {
3897                            1
3898                        }
3899
3900                        fn b() {…
3901                        }
3902
3903                        fn c() {…
3904                        }
3905                    }
3906                "
3907                .unindent(),
3908            );
3909
3910            view.unfold(&Unfold, cx);
3911            assert_eq!(view.display_text(cx), buffer.read(cx).text());
3912        });
3913    }
3914
3915    #[gpui::test]
3916    fn test_move_cursor(cx: &mut gpui::MutableAppContext) {
3917        let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6), cx));
3918        let settings = EditorSettings::test(&cx);
3919        let (_, view) = cx.add_window(Default::default(), |cx| {
3920            build_editor(buffer.clone(), settings, cx)
3921        });
3922
3923        buffer.update(cx, |buffer, cx| {
3924            buffer.edit(
3925                vec![
3926                    Point::new(1, 0)..Point::new(1, 0),
3927                    Point::new(1, 1)..Point::new(1, 1),
3928                ],
3929                "\t",
3930                cx,
3931            );
3932        });
3933
3934        view.update(cx, |view, cx| {
3935            assert_eq!(
3936                view.selection_ranges(cx),
3937                &[DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0)]
3938            );
3939
3940            view.move_down(&MoveDown, cx);
3941            assert_eq!(
3942                view.selection_ranges(cx),
3943                &[DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0)]
3944            );
3945
3946            view.move_right(&MoveRight, cx);
3947            assert_eq!(
3948                view.selection_ranges(cx),
3949                &[DisplayPoint::new(1, 4)..DisplayPoint::new(1, 4)]
3950            );
3951
3952            view.move_left(&MoveLeft, cx);
3953            assert_eq!(
3954                view.selection_ranges(cx),
3955                &[DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0)]
3956            );
3957
3958            view.move_up(&MoveUp, cx);
3959            assert_eq!(
3960                view.selection_ranges(cx),
3961                &[DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0)]
3962            );
3963
3964            view.move_to_end(&MoveToEnd, cx);
3965            assert_eq!(
3966                view.selection_ranges(cx),
3967                &[DisplayPoint::new(5, 6)..DisplayPoint::new(5, 6)]
3968            );
3969
3970            view.move_to_beginning(&MoveToBeginning, cx);
3971            assert_eq!(
3972                view.selection_ranges(cx),
3973                &[DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0)]
3974            );
3975
3976            view.select_display_ranges(&[DisplayPoint::new(0, 1)..DisplayPoint::new(0, 2)], cx)
3977                .unwrap();
3978            view.select_to_beginning(&SelectToBeginning, cx);
3979            assert_eq!(
3980                view.selection_ranges(cx),
3981                &[DisplayPoint::new(0, 1)..DisplayPoint::new(0, 0)]
3982            );
3983
3984            view.select_to_end(&SelectToEnd, cx);
3985            assert_eq!(
3986                view.selection_ranges(cx),
3987                &[DisplayPoint::new(0, 1)..DisplayPoint::new(5, 6)]
3988            );
3989        });
3990    }
3991
3992    #[gpui::test]
3993    fn test_move_cursor_multibyte(cx: &mut gpui::MutableAppContext) {
3994        let buffer = cx.add_model(|cx| Buffer::new(0, "ⓐⓑⓒⓓⓔ\nabcde\nαβγδε\n", cx));
3995        let settings = EditorSettings::test(&cx);
3996        let (_, view) = cx.add_window(Default::default(), |cx| {
3997            build_editor(buffer.clone(), settings, cx)
3998        });
3999
4000        assert_eq!('ⓐ'.len_utf8(), 3);
4001        assert_eq!('α'.len_utf8(), 2);
4002
4003        view.update(cx, |view, cx| {
4004            view.fold_ranges(
4005                vec![
4006                    Point::new(0, 6)..Point::new(0, 12),
4007                    Point::new(1, 2)..Point::new(1, 4),
4008                    Point::new(2, 4)..Point::new(2, 8),
4009                ],
4010                cx,
4011            );
4012            assert_eq!(view.display_text(cx), "ⓐⓑ…ⓔ\nab…e\nαβ…ε\n");
4013
4014            view.move_right(&MoveRight, cx);
4015            assert_eq!(view.selection_ranges(cx), &[empty_range(0, "ⓐ".len())]);
4016            view.move_right(&MoveRight, cx);
4017            assert_eq!(view.selection_ranges(cx), &[empty_range(0, "ⓐⓑ".len())]);
4018            view.move_right(&MoveRight, cx);
4019            assert_eq!(view.selection_ranges(cx), &[empty_range(0, "ⓐⓑ…".len())]);
4020
4021            view.move_down(&MoveDown, cx);
4022            assert_eq!(view.selection_ranges(cx), &[empty_range(1, "ab…".len())]);
4023            view.move_left(&MoveLeft, cx);
4024            assert_eq!(view.selection_ranges(cx), &[empty_range(1, "ab".len())]);
4025            view.move_left(&MoveLeft, cx);
4026            assert_eq!(view.selection_ranges(cx), &[empty_range(1, "a".len())]);
4027
4028            view.move_down(&MoveDown, cx);
4029            assert_eq!(view.selection_ranges(cx), &[empty_range(2, "α".len())]);
4030            view.move_right(&MoveRight, cx);
4031            assert_eq!(view.selection_ranges(cx), &[empty_range(2, "αβ".len())]);
4032            view.move_right(&MoveRight, cx);
4033            assert_eq!(view.selection_ranges(cx), &[empty_range(2, "αβ…".len())]);
4034            view.move_right(&MoveRight, cx);
4035            assert_eq!(view.selection_ranges(cx), &[empty_range(2, "αβ…ε".len())]);
4036
4037            view.move_up(&MoveUp, cx);
4038            assert_eq!(view.selection_ranges(cx), &[empty_range(1, "ab…e".len())]);
4039            view.move_up(&MoveUp, cx);
4040            assert_eq!(view.selection_ranges(cx), &[empty_range(0, "ⓐⓑ…ⓔ".len())]);
4041            view.move_left(&MoveLeft, cx);
4042            assert_eq!(view.selection_ranges(cx), &[empty_range(0, "ⓐⓑ…".len())]);
4043            view.move_left(&MoveLeft, cx);
4044            assert_eq!(view.selection_ranges(cx), &[empty_range(0, "ⓐⓑ".len())]);
4045            view.move_left(&MoveLeft, cx);
4046            assert_eq!(view.selection_ranges(cx), &[empty_range(0, "ⓐ".len())]);
4047        });
4048    }
4049
4050    #[gpui::test]
4051    fn test_move_cursor_different_line_lengths(cx: &mut gpui::MutableAppContext) {
4052        let buffer = cx.add_model(|cx| Buffer::new(0, "ⓐⓑⓒⓓⓔ\nabcd\nαβγ\nabcd\nⓐⓑⓒⓓⓔ\n", cx));
4053        let settings = EditorSettings::test(&cx);
4054        let (_, view) = cx.add_window(Default::default(), |cx| {
4055            build_editor(buffer.clone(), settings, cx)
4056        });
4057        view.update(cx, |view, cx| {
4058            view.select_display_ranges(&[empty_range(0, "ⓐⓑⓒⓓⓔ".len())], cx)
4059                .unwrap();
4060
4061            view.move_down(&MoveDown, cx);
4062            assert_eq!(view.selection_ranges(cx), &[empty_range(1, "abcd".len())]);
4063
4064            view.move_down(&MoveDown, cx);
4065            assert_eq!(view.selection_ranges(cx), &[empty_range(2, "αβγ".len())]);
4066
4067            view.move_down(&MoveDown, cx);
4068            assert_eq!(view.selection_ranges(cx), &[empty_range(3, "abcd".len())]);
4069
4070            view.move_down(&MoveDown, cx);
4071            assert_eq!(view.selection_ranges(cx), &[empty_range(4, "ⓐⓑⓒⓓⓔ".len())]);
4072
4073            view.move_up(&MoveUp, cx);
4074            assert_eq!(view.selection_ranges(cx), &[empty_range(3, "abcd".len())]);
4075
4076            view.move_up(&MoveUp, cx);
4077            assert_eq!(view.selection_ranges(cx), &[empty_range(2, "αβγ".len())]);
4078        });
4079    }
4080
4081    #[gpui::test]
4082    fn test_beginning_end_of_line(cx: &mut gpui::MutableAppContext) {
4083        let buffer = cx.add_model(|cx| Buffer::new(0, "abc\n  def", cx));
4084        let settings = EditorSettings::test(&cx);
4085        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
4086        view.update(cx, |view, cx| {
4087            view.select_display_ranges(
4088                &[
4089                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1),
4090                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 4),
4091                ],
4092                cx,
4093            )
4094            .unwrap();
4095        });
4096
4097        view.update(cx, |view, cx| {
4098            view.move_to_beginning_of_line(&MoveToBeginningOfLine, cx);
4099            assert_eq!(
4100                view.selection_ranges(cx),
4101                &[
4102                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0),
4103                    DisplayPoint::new(1, 2)..DisplayPoint::new(1, 2),
4104                ]
4105            );
4106        });
4107
4108        view.update(cx, |view, cx| {
4109            view.move_to_beginning_of_line(&MoveToBeginningOfLine, cx);
4110            assert_eq!(
4111                view.selection_ranges(cx),
4112                &[
4113                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0),
4114                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
4115                ]
4116            );
4117        });
4118
4119        view.update(cx, |view, cx| {
4120            view.move_to_beginning_of_line(&MoveToBeginningOfLine, cx);
4121            assert_eq!(
4122                view.selection_ranges(cx),
4123                &[
4124                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0),
4125                    DisplayPoint::new(1, 2)..DisplayPoint::new(1, 2),
4126                ]
4127            );
4128        });
4129
4130        view.update(cx, |view, cx| {
4131            view.move_to_end_of_line(&MoveToEndOfLine, cx);
4132            assert_eq!(
4133                view.selection_ranges(cx),
4134                &[
4135                    DisplayPoint::new(0, 3)..DisplayPoint::new(0, 3),
4136                    DisplayPoint::new(1, 5)..DisplayPoint::new(1, 5),
4137                ]
4138            );
4139        });
4140
4141        // Moving to the end of line again is a no-op.
4142        view.update(cx, |view, cx| {
4143            view.move_to_end_of_line(&MoveToEndOfLine, cx);
4144            assert_eq!(
4145                view.selection_ranges(cx),
4146                &[
4147                    DisplayPoint::new(0, 3)..DisplayPoint::new(0, 3),
4148                    DisplayPoint::new(1, 5)..DisplayPoint::new(1, 5),
4149                ]
4150            );
4151        });
4152
4153        view.update(cx, |view, cx| {
4154            view.move_left(&MoveLeft, cx);
4155            view.select_to_beginning_of_line(&SelectToBeginningOfLine(true), cx);
4156            assert_eq!(
4157                view.selection_ranges(cx),
4158                &[
4159                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 0),
4160                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 2),
4161                ]
4162            );
4163        });
4164
4165        view.update(cx, |view, cx| {
4166            view.select_to_beginning_of_line(&SelectToBeginningOfLine(true), cx);
4167            assert_eq!(
4168                view.selection_ranges(cx),
4169                &[
4170                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 0),
4171                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 0),
4172                ]
4173            );
4174        });
4175
4176        view.update(cx, |view, cx| {
4177            view.select_to_beginning_of_line(&SelectToBeginningOfLine(true), cx);
4178            assert_eq!(
4179                view.selection_ranges(cx),
4180                &[
4181                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 0),
4182                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 2),
4183                ]
4184            );
4185        });
4186
4187        view.update(cx, |view, cx| {
4188            view.select_to_end_of_line(&SelectToEndOfLine, cx);
4189            assert_eq!(
4190                view.selection_ranges(cx),
4191                &[
4192                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 3),
4193                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 5),
4194                ]
4195            );
4196        });
4197
4198        view.update(cx, |view, cx| {
4199            view.delete_to_end_of_line(&DeleteToEndOfLine, cx);
4200            assert_eq!(view.display_text(cx), "ab\n  de");
4201            assert_eq!(
4202                view.selection_ranges(cx),
4203                &[
4204                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
4205                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 4),
4206                ]
4207            );
4208        });
4209
4210        view.update(cx, |view, cx| {
4211            view.delete_to_beginning_of_line(&DeleteToBeginningOfLine, cx);
4212            assert_eq!(view.display_text(cx), "\n");
4213            assert_eq!(
4214                view.selection_ranges(cx),
4215                &[
4216                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0),
4217                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
4218                ]
4219            );
4220        });
4221    }
4222
4223    #[gpui::test]
4224    fn test_prev_next_word_boundary(cx: &mut gpui::MutableAppContext) {
4225        let buffer =
4226            cx.add_model(|cx| Buffer::new(0, "use std::str::{foo, bar}\n\n  {baz.qux()}", cx));
4227        let settings = EditorSettings::test(&cx);
4228        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
4229        view.update(cx, |view, cx| {
4230            view.select_display_ranges(
4231                &[
4232                    DisplayPoint::new(0, 11)..DisplayPoint::new(0, 11),
4233                    DisplayPoint::new(2, 4)..DisplayPoint::new(2, 4),
4234                ],
4235                cx,
4236            )
4237            .unwrap();
4238        });
4239
4240        view.update(cx, |view, cx| {
4241            view.move_to_previous_word_boundary(&MoveToPreviousWordBoundary, cx);
4242            assert_eq!(
4243                view.selection_ranges(cx),
4244                &[
4245                    DisplayPoint::new(0, 9)..DisplayPoint::new(0, 9),
4246                    DisplayPoint::new(2, 3)..DisplayPoint::new(2, 3),
4247                ]
4248            );
4249        });
4250
4251        view.update(cx, |view, cx| {
4252            view.move_to_previous_word_boundary(&MoveToPreviousWordBoundary, cx);
4253            assert_eq!(
4254                view.selection_ranges(cx),
4255                &[
4256                    DisplayPoint::new(0, 7)..DisplayPoint::new(0, 7),
4257                    DisplayPoint::new(2, 2)..DisplayPoint::new(2, 2),
4258                ]
4259            );
4260        });
4261
4262        view.update(cx, |view, cx| {
4263            view.move_to_previous_word_boundary(&MoveToPreviousWordBoundary, cx);
4264            assert_eq!(
4265                view.selection_ranges(cx),
4266                &[
4267                    DisplayPoint::new(0, 4)..DisplayPoint::new(0, 4),
4268                    DisplayPoint::new(2, 0)..DisplayPoint::new(2, 0),
4269                ]
4270            );
4271        });
4272
4273        view.update(cx, |view, cx| {
4274            view.move_to_previous_word_boundary(&MoveToPreviousWordBoundary, cx);
4275            assert_eq!(
4276                view.selection_ranges(cx),
4277                &[
4278                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0),
4279                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
4280                ]
4281            );
4282        });
4283
4284        view.update(cx, |view, cx| {
4285            view.move_to_previous_word_boundary(&MoveToPreviousWordBoundary, cx);
4286            assert_eq!(
4287                view.selection_ranges(cx),
4288                &[
4289                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0),
4290                    DisplayPoint::new(0, 23)..DisplayPoint::new(0, 23),
4291                ]
4292            );
4293        });
4294
4295        view.update(cx, |view, cx| {
4296            view.move_to_next_word_boundary(&MoveToNextWordBoundary, cx);
4297            assert_eq!(
4298                view.selection_ranges(cx),
4299                &[
4300                    DisplayPoint::new(0, 3)..DisplayPoint::new(0, 3),
4301                    DisplayPoint::new(0, 24)..DisplayPoint::new(0, 24),
4302                ]
4303            );
4304        });
4305
4306        view.update(cx, |view, cx| {
4307            view.move_to_next_word_boundary(&MoveToNextWordBoundary, cx);
4308            assert_eq!(
4309                view.selection_ranges(cx),
4310                &[
4311                    DisplayPoint::new(0, 7)..DisplayPoint::new(0, 7),
4312                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
4313                ]
4314            );
4315        });
4316
4317        view.update(cx, |view, cx| {
4318            view.move_to_next_word_boundary(&MoveToNextWordBoundary, cx);
4319            assert_eq!(
4320                view.selection_ranges(cx),
4321                &[
4322                    DisplayPoint::new(0, 9)..DisplayPoint::new(0, 9),
4323                    DisplayPoint::new(2, 3)..DisplayPoint::new(2, 3),
4324                ]
4325            );
4326        });
4327
4328        view.update(cx, |view, cx| {
4329            view.move_right(&MoveRight, cx);
4330            view.select_to_previous_word_boundary(&SelectToPreviousWordBoundary, cx);
4331            assert_eq!(
4332                view.selection_ranges(cx),
4333                &[
4334                    DisplayPoint::new(0, 10)..DisplayPoint::new(0, 9),
4335                    DisplayPoint::new(2, 4)..DisplayPoint::new(2, 3),
4336                ]
4337            );
4338        });
4339
4340        view.update(cx, |view, cx| {
4341            view.select_to_previous_word_boundary(&SelectToPreviousWordBoundary, cx);
4342            assert_eq!(
4343                view.selection_ranges(cx),
4344                &[
4345                    DisplayPoint::new(0, 10)..DisplayPoint::new(0, 7),
4346                    DisplayPoint::new(2, 4)..DisplayPoint::new(2, 2),
4347                ]
4348            );
4349        });
4350
4351        view.update(cx, |view, cx| {
4352            view.select_to_next_word_boundary(&SelectToNextWordBoundary, cx);
4353            assert_eq!(
4354                view.selection_ranges(cx),
4355                &[
4356                    DisplayPoint::new(0, 10)..DisplayPoint::new(0, 9),
4357                    DisplayPoint::new(2, 4)..DisplayPoint::new(2, 3),
4358                ]
4359            );
4360        });
4361    }
4362
4363    #[gpui::test]
4364    fn test_prev_next_word_bounds_with_soft_wrap(cx: &mut gpui::MutableAppContext) {
4365        let buffer =
4366            cx.add_model(|cx| Buffer::new(0, "use one::{\n    two::three::four::five\n};", cx));
4367        let settings = EditorSettings::test(&cx);
4368        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
4369
4370        view.update(cx, |view, cx| {
4371            view.set_wrap_width(Some(140.), cx);
4372            assert_eq!(
4373                view.display_text(cx),
4374                "use one::{\n    two::three::\n    four::five\n};"
4375            );
4376
4377            view.select_display_ranges(&[DisplayPoint::new(1, 7)..DisplayPoint::new(1, 7)], cx)
4378                .unwrap();
4379
4380            view.move_to_next_word_boundary(&MoveToNextWordBoundary, cx);
4381            assert_eq!(
4382                view.selection_ranges(cx),
4383                &[DisplayPoint::new(1, 9)..DisplayPoint::new(1, 9)]
4384            );
4385
4386            view.move_to_next_word_boundary(&MoveToNextWordBoundary, cx);
4387            assert_eq!(
4388                view.selection_ranges(cx),
4389                &[DisplayPoint::new(1, 14)..DisplayPoint::new(1, 14)]
4390            );
4391
4392            view.move_to_next_word_boundary(&MoveToNextWordBoundary, cx);
4393            assert_eq!(
4394                view.selection_ranges(cx),
4395                &[DisplayPoint::new(2, 4)..DisplayPoint::new(2, 4)]
4396            );
4397
4398            view.move_to_next_word_boundary(&MoveToNextWordBoundary, cx);
4399            assert_eq!(
4400                view.selection_ranges(cx),
4401                &[DisplayPoint::new(2, 8)..DisplayPoint::new(2, 8)]
4402            );
4403
4404            view.move_to_previous_word_boundary(&MoveToPreviousWordBoundary, cx);
4405            assert_eq!(
4406                view.selection_ranges(cx),
4407                &[DisplayPoint::new(2, 4)..DisplayPoint::new(2, 4)]
4408            );
4409
4410            view.move_to_previous_word_boundary(&MoveToPreviousWordBoundary, cx);
4411            assert_eq!(
4412                view.selection_ranges(cx),
4413                &[DisplayPoint::new(1, 14)..DisplayPoint::new(1, 14)]
4414            );
4415        });
4416    }
4417
4418    #[gpui::test]
4419    fn test_delete_to_word_boundary(cx: &mut gpui::MutableAppContext) {
4420        let buffer = cx.add_model(|cx| Buffer::new(0, "one two three four", cx));
4421        let settings = EditorSettings::test(&cx);
4422        let (_, view) = cx.add_window(Default::default(), |cx| {
4423            build_editor(buffer.clone(), settings, cx)
4424        });
4425
4426        view.update(cx, |view, cx| {
4427            view.select_display_ranges(
4428                &[
4429                    // an empty selection - the preceding word fragment is deleted
4430                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
4431                    // characters selected - they are deleted
4432                    DisplayPoint::new(0, 9)..DisplayPoint::new(0, 12),
4433                ],
4434                cx,
4435            )
4436            .unwrap();
4437            view.delete_to_previous_word_boundary(&DeleteToPreviousWordBoundary, cx);
4438        });
4439
4440        assert_eq!(buffer.read(cx).text(), "e two te four");
4441
4442        view.update(cx, |view, cx| {
4443            view.select_display_ranges(
4444                &[
4445                    // an empty selection - the following word fragment is deleted
4446                    DisplayPoint::new(0, 3)..DisplayPoint::new(0, 3),
4447                    // characters selected - they are deleted
4448                    DisplayPoint::new(0, 9)..DisplayPoint::new(0, 10),
4449                ],
4450                cx,
4451            )
4452            .unwrap();
4453            view.delete_to_next_word_boundary(&DeleteToNextWordBoundary, cx);
4454        });
4455
4456        assert_eq!(buffer.read(cx).text(), "e t te our");
4457    }
4458
4459    #[gpui::test]
4460    fn test_newline(cx: &mut gpui::MutableAppContext) {
4461        let buffer = cx.add_model(|cx| Buffer::new(0, "aaaa\n    bbbb\n", cx));
4462        let settings = EditorSettings::test(&cx);
4463        let (_, view) = cx.add_window(Default::default(), |cx| {
4464            build_editor(buffer.clone(), settings, cx)
4465        });
4466
4467        view.update(cx, |view, cx| {
4468            view.select_display_ranges(
4469                &[
4470                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
4471                    DisplayPoint::new(1, 2)..DisplayPoint::new(1, 2),
4472                    DisplayPoint::new(1, 6)..DisplayPoint::new(1, 6),
4473                ],
4474                cx,
4475            )
4476            .unwrap();
4477
4478            view.newline(&Newline, cx);
4479            assert_eq!(view.text(cx), "aa\naa\n  \n    bb\n    bb\n");
4480        });
4481    }
4482
4483    #[gpui::test]
4484    fn test_indent_outdent(cx: &mut gpui::MutableAppContext) {
4485        let buffer = cx.add_model(|cx| Buffer::new(0, "  one two\nthree\n four", cx));
4486        let settings = EditorSettings::test(&cx);
4487        let (_, view) = cx.add_window(Default::default(), |cx| {
4488            build_editor(buffer.clone(), settings, cx)
4489        });
4490
4491        view.update(cx, |view, cx| {
4492            // two selections on the same line
4493            view.select_display_ranges(
4494                &[
4495                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 5),
4496                    DisplayPoint::new(0, 6)..DisplayPoint::new(0, 9),
4497                ],
4498                cx,
4499            )
4500            .unwrap();
4501
4502            // indent from mid-tabstop to full tabstop
4503            view.tab(&Tab, cx);
4504            assert_eq!(view.text(cx), "    one two\nthree\n four");
4505            assert_eq!(
4506                view.selection_ranges(cx),
4507                &[
4508                    DisplayPoint::new(0, 4)..DisplayPoint::new(0, 7),
4509                    DisplayPoint::new(0, 8)..DisplayPoint::new(0, 11),
4510                ]
4511            );
4512
4513            // outdent from 1 tabstop to 0 tabstops
4514            view.outdent(&Outdent, cx);
4515            assert_eq!(view.text(cx), "one two\nthree\n four");
4516            assert_eq!(
4517                view.selection_ranges(cx),
4518                &[
4519                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 3),
4520                    DisplayPoint::new(0, 4)..DisplayPoint::new(0, 7),
4521                ]
4522            );
4523
4524            // select across line ending
4525            view.select_display_ranges(&[DisplayPoint::new(1, 1)..DisplayPoint::new(2, 0)], cx)
4526                .unwrap();
4527
4528            // indent and outdent affect only the preceding line
4529            view.tab(&Tab, cx);
4530            assert_eq!(view.text(cx), "one two\n    three\n four");
4531            assert_eq!(
4532                view.selection_ranges(cx),
4533                &[DisplayPoint::new(1, 5)..DisplayPoint::new(2, 0)]
4534            );
4535            view.outdent(&Outdent, cx);
4536            assert_eq!(view.text(cx), "one two\nthree\n four");
4537            assert_eq!(
4538                view.selection_ranges(cx),
4539                &[DisplayPoint::new(1, 1)..DisplayPoint::new(2, 0)]
4540            );
4541        });
4542    }
4543
4544    #[gpui::test]
4545    fn test_backspace(cx: &mut gpui::MutableAppContext) {
4546        let buffer = cx.add_model(|cx| {
4547            Buffer::new(
4548                0,
4549                "one two three\nfour five six\nseven eight nine\nten\n",
4550                cx,
4551            )
4552        });
4553        let settings = EditorSettings::test(&cx);
4554        let (_, view) = cx.add_window(Default::default(), |cx| {
4555            build_editor(buffer.clone(), settings, cx)
4556        });
4557
4558        view.update(cx, |view, cx| {
4559            view.select_display_ranges(
4560                &[
4561                    // an empty selection - the preceding character is deleted
4562                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
4563                    // one character selected - it is deleted
4564                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 3),
4565                    // a line suffix selected - it is deleted
4566                    DisplayPoint::new(2, 6)..DisplayPoint::new(3, 0),
4567                ],
4568                cx,
4569            )
4570            .unwrap();
4571            view.backspace(&Backspace, cx);
4572        });
4573
4574        assert_eq!(
4575            buffer.read(cx).text(),
4576            "oe two three\nfou five six\nseven ten\n"
4577        );
4578    }
4579
4580    #[gpui::test]
4581    fn test_delete(cx: &mut gpui::MutableAppContext) {
4582        let buffer = cx.add_model(|cx| {
4583            Buffer::new(
4584                0,
4585                "one two three\nfour five six\nseven eight nine\nten\n",
4586                cx,
4587            )
4588        });
4589        let settings = EditorSettings::test(&cx);
4590        let (_, view) = cx.add_window(Default::default(), |cx| {
4591            build_editor(buffer.clone(), settings, cx)
4592        });
4593
4594        view.update(cx, |view, cx| {
4595            view.select_display_ranges(
4596                &[
4597                    // an empty selection - the following character is deleted
4598                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
4599                    // one character selected - it is deleted
4600                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 3),
4601                    // a line suffix selected - it is deleted
4602                    DisplayPoint::new(2, 6)..DisplayPoint::new(3, 0),
4603                ],
4604                cx,
4605            )
4606            .unwrap();
4607            view.delete(&Delete, cx);
4608        });
4609
4610        assert_eq!(
4611            buffer.read(cx).text(),
4612            "on two three\nfou five six\nseven ten\n"
4613        );
4614    }
4615
4616    #[gpui::test]
4617    fn test_delete_line(cx: &mut gpui::MutableAppContext) {
4618        let settings = EditorSettings::test(&cx);
4619        let buffer = cx.add_model(|cx| Buffer::new(0, "abc\ndef\nghi\n", cx));
4620        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
4621        view.update(cx, |view, cx| {
4622            view.select_display_ranges(
4623                &[
4624                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1),
4625                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 1),
4626                    DisplayPoint::new(3, 0)..DisplayPoint::new(3, 0),
4627                ],
4628                cx,
4629            )
4630            .unwrap();
4631            view.delete_line(&DeleteLine, cx);
4632            assert_eq!(view.display_text(cx), "ghi");
4633            assert_eq!(
4634                view.selection_ranges(cx),
4635                vec![
4636                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0),
4637                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1)
4638                ]
4639            );
4640        });
4641
4642        let settings = EditorSettings::test(&cx);
4643        let buffer = cx.add_model(|cx| Buffer::new(0, "abc\ndef\nghi\n", cx));
4644        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
4645        view.update(cx, |view, cx| {
4646            view.select_display_ranges(&[DisplayPoint::new(2, 0)..DisplayPoint::new(0, 1)], cx)
4647                .unwrap();
4648            view.delete_line(&DeleteLine, cx);
4649            assert_eq!(view.display_text(cx), "ghi\n");
4650            assert_eq!(
4651                view.selection_ranges(cx),
4652                vec![DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1)]
4653            );
4654        });
4655    }
4656
4657    #[gpui::test]
4658    fn test_duplicate_line(cx: &mut gpui::MutableAppContext) {
4659        let settings = EditorSettings::test(&cx);
4660        let buffer = cx.add_model(|cx| Buffer::new(0, "abc\ndef\nghi\n", cx));
4661        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
4662        view.update(cx, |view, cx| {
4663            view.select_display_ranges(
4664                &[
4665                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 1),
4666                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
4667                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
4668                    DisplayPoint::new(3, 0)..DisplayPoint::new(3, 0),
4669                ],
4670                cx,
4671            )
4672            .unwrap();
4673            view.duplicate_line(&DuplicateLine, cx);
4674            assert_eq!(view.display_text(cx), "abc\nabc\ndef\ndef\nghi\n\n");
4675            assert_eq!(
4676                view.selection_ranges(cx),
4677                vec![
4678                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 1),
4679                    DisplayPoint::new(1, 2)..DisplayPoint::new(1, 2),
4680                    DisplayPoint::new(3, 0)..DisplayPoint::new(3, 0),
4681                    DisplayPoint::new(6, 0)..DisplayPoint::new(6, 0),
4682                ]
4683            );
4684        });
4685
4686        let settings = EditorSettings::test(&cx);
4687        let buffer = cx.add_model(|cx| Buffer::new(0, "abc\ndef\nghi\n", cx));
4688        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
4689        view.update(cx, |view, cx| {
4690            view.select_display_ranges(
4691                &[
4692                    DisplayPoint::new(0, 1)..DisplayPoint::new(1, 1),
4693                    DisplayPoint::new(1, 2)..DisplayPoint::new(2, 1),
4694                ],
4695                cx,
4696            )
4697            .unwrap();
4698            view.duplicate_line(&DuplicateLine, cx);
4699            assert_eq!(view.display_text(cx), "abc\ndef\nghi\nabc\ndef\nghi\n");
4700            assert_eq!(
4701                view.selection_ranges(cx),
4702                vec![
4703                    DisplayPoint::new(3, 1)..DisplayPoint::new(4, 1),
4704                    DisplayPoint::new(4, 2)..DisplayPoint::new(5, 1),
4705                ]
4706            );
4707        });
4708    }
4709
4710    #[gpui::test]
4711    fn test_move_line_up_down(cx: &mut gpui::MutableAppContext) {
4712        let settings = EditorSettings::test(&cx);
4713        let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(10, 5), cx));
4714        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
4715        view.update(cx, |view, cx| {
4716            view.fold_ranges(
4717                vec![
4718                    Point::new(0, 2)..Point::new(1, 2),
4719                    Point::new(2, 3)..Point::new(4, 1),
4720                    Point::new(7, 0)..Point::new(8, 4),
4721                ],
4722                cx,
4723            );
4724            view.select_display_ranges(
4725                &[
4726                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1),
4727                    DisplayPoint::new(3, 1)..DisplayPoint::new(3, 1),
4728                    DisplayPoint::new(3, 2)..DisplayPoint::new(4, 3),
4729                    DisplayPoint::new(5, 0)..DisplayPoint::new(5, 2),
4730                ],
4731                cx,
4732            )
4733            .unwrap();
4734            assert_eq!(
4735                view.display_text(cx),
4736                "aa…bbb\nccc…eeee\nfffff\nggggg\n…i\njjjjj"
4737            );
4738
4739            view.move_line_up(&MoveLineUp, cx);
4740            assert_eq!(
4741                view.display_text(cx),
4742                "aa…bbb\nccc…eeee\nggggg\n…i\njjjjj\nfffff"
4743            );
4744            assert_eq!(
4745                view.selection_ranges(cx),
4746                vec![
4747                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1),
4748                    DisplayPoint::new(2, 1)..DisplayPoint::new(2, 1),
4749                    DisplayPoint::new(2, 2)..DisplayPoint::new(3, 3),
4750                    DisplayPoint::new(4, 0)..DisplayPoint::new(4, 2)
4751                ]
4752            );
4753        });
4754
4755        view.update(cx, |view, cx| {
4756            view.move_line_down(&MoveLineDown, cx);
4757            assert_eq!(
4758                view.display_text(cx),
4759                "ccc…eeee\naa…bbb\nfffff\nggggg\n…i\njjjjj"
4760            );
4761            assert_eq!(
4762                view.selection_ranges(cx),
4763                vec![
4764                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 1),
4765                    DisplayPoint::new(3, 1)..DisplayPoint::new(3, 1),
4766                    DisplayPoint::new(3, 2)..DisplayPoint::new(4, 3),
4767                    DisplayPoint::new(5, 0)..DisplayPoint::new(5, 2)
4768                ]
4769            );
4770        });
4771
4772        view.update(cx, |view, cx| {
4773            view.move_line_down(&MoveLineDown, cx);
4774            assert_eq!(
4775                view.display_text(cx),
4776                "ccc…eeee\nfffff\naa…bbb\nggggg\n…i\njjjjj"
4777            );
4778            assert_eq!(
4779                view.selection_ranges(cx),
4780                vec![
4781                    DisplayPoint::new(2, 1)..DisplayPoint::new(2, 1),
4782                    DisplayPoint::new(3, 1)..DisplayPoint::new(3, 1),
4783                    DisplayPoint::new(3, 2)..DisplayPoint::new(4, 3),
4784                    DisplayPoint::new(5, 0)..DisplayPoint::new(5, 2)
4785                ]
4786            );
4787        });
4788
4789        view.update(cx, |view, cx| {
4790            view.move_line_up(&MoveLineUp, cx);
4791            assert_eq!(
4792                view.display_text(cx),
4793                "ccc…eeee\naa…bbb\nggggg\n…i\njjjjj\nfffff"
4794            );
4795            assert_eq!(
4796                view.selection_ranges(cx),
4797                vec![
4798                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 1),
4799                    DisplayPoint::new(2, 1)..DisplayPoint::new(2, 1),
4800                    DisplayPoint::new(2, 2)..DisplayPoint::new(3, 3),
4801                    DisplayPoint::new(4, 0)..DisplayPoint::new(4, 2)
4802                ]
4803            );
4804        });
4805    }
4806
4807    #[gpui::test]
4808    fn test_clipboard(cx: &mut gpui::MutableAppContext) {
4809        let buffer = cx.add_model(|cx| Buffer::new(0, "one✅ two three four five six ", cx));
4810        let settings = EditorSettings::test(&cx);
4811        let view = cx
4812            .add_window(Default::default(), |cx| {
4813                build_editor(buffer.clone(), settings, cx)
4814            })
4815            .1;
4816
4817        // Cut with three selections. Clipboard text is divided into three slices.
4818        view.update(cx, |view, cx| {
4819            view.select_ranges(vec![0..7, 11..17, 22..27], None, cx);
4820            view.cut(&Cut, cx);
4821            assert_eq!(view.display_text(cx), "two four six ");
4822        });
4823
4824        // Paste with three cursors. Each cursor pastes one slice of the clipboard text.
4825        view.update(cx, |view, cx| {
4826            view.select_ranges(vec![4..4, 9..9, 13..13], None, cx);
4827            view.paste(&Paste, cx);
4828            assert_eq!(view.display_text(cx), "two one✅ four three six five ");
4829            assert_eq!(
4830                view.selection_ranges(cx),
4831                &[
4832                    DisplayPoint::new(0, 11)..DisplayPoint::new(0, 11),
4833                    DisplayPoint::new(0, 22)..DisplayPoint::new(0, 22),
4834                    DisplayPoint::new(0, 31)..DisplayPoint::new(0, 31)
4835                ]
4836            );
4837        });
4838
4839        // Paste again but with only two cursors. Since the number of cursors doesn't
4840        // match the number of slices in the clipboard, the entire clipboard text
4841        // is pasted at each cursor.
4842        view.update(cx, |view, cx| {
4843            view.select_ranges(vec![0..0, 31..31], None, cx);
4844            view.handle_input(&Input("( ".into()), cx);
4845            view.paste(&Paste, cx);
4846            view.handle_input(&Input(") ".into()), cx);
4847            assert_eq!(
4848                view.display_text(cx),
4849                "( one✅ three five ) two one✅ four three six five ( one✅ three five ) "
4850            );
4851        });
4852
4853        view.update(cx, |view, cx| {
4854            view.select_ranges(vec![0..0], None, cx);
4855            view.handle_input(&Input("123\n4567\n89\n".into()), cx);
4856            assert_eq!(
4857                view.display_text(cx),
4858                "123\n4567\n89\n( one✅ three five ) two one✅ four three six five ( one✅ three five ) "
4859            );
4860        });
4861
4862        // Cut with three selections, one of which is full-line.
4863        view.update(cx, |view, cx| {
4864            view.select_display_ranges(
4865                &[
4866                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 2),
4867                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 1),
4868                    DisplayPoint::new(2, 0)..DisplayPoint::new(2, 1),
4869                ],
4870                cx,
4871            )
4872            .unwrap();
4873            view.cut(&Cut, cx);
4874            assert_eq!(
4875                view.display_text(cx),
4876                "13\n9\n( one✅ three five ) two one✅ four three six five ( one✅ three five ) "
4877            );
4878        });
4879
4880        // Paste with three selections, noticing how the copied selection that was full-line
4881        // gets inserted before the second cursor.
4882        view.update(cx, |view, cx| {
4883            view.select_display_ranges(
4884                &[
4885                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1),
4886                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 1),
4887                    DisplayPoint::new(2, 2)..DisplayPoint::new(2, 3),
4888                ],
4889                cx,
4890            )
4891            .unwrap();
4892            view.paste(&Paste, cx);
4893            assert_eq!(
4894                view.display_text(cx),
4895                "123\n4567\n9\n( 8ne✅ three five ) two one✅ four three six five ( one✅ three five ) "
4896            );
4897            assert_eq!(
4898                view.selection_ranges(cx),
4899                &[
4900                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
4901                    DisplayPoint::new(2, 1)..DisplayPoint::new(2, 1),
4902                    DisplayPoint::new(3, 3)..DisplayPoint::new(3, 3),
4903                ]
4904            );
4905        });
4906
4907        // Copy with a single cursor only, which writes the whole line into the clipboard.
4908        view.update(cx, |view, cx| {
4909            view.select_display_ranges(&[DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1)], cx)
4910                .unwrap();
4911            view.copy(&Copy, cx);
4912        });
4913
4914        // Paste with three selections, noticing how the copied full-line selection is inserted
4915        // before the empty selections but replaces the selection that is non-empty.
4916        view.update(cx, |view, cx| {
4917            view.select_display_ranges(
4918                &[
4919                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1),
4920                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 2),
4921                    DisplayPoint::new(2, 1)..DisplayPoint::new(2, 1),
4922                ],
4923                cx,
4924            )
4925            .unwrap();
4926            view.paste(&Paste, cx);
4927            assert_eq!(
4928                view.display_text(cx),
4929                "123\n123\n123\n67\n123\n9\n( 8ne✅ three five ) two one✅ four three six five ( one✅ three five ) "
4930            );
4931            assert_eq!(
4932                view.selection_ranges(cx),
4933                &[
4934                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 1),
4935                    DisplayPoint::new(3, 0)..DisplayPoint::new(3, 0),
4936                    DisplayPoint::new(5, 1)..DisplayPoint::new(5, 1),
4937                ]
4938            );
4939        });
4940    }
4941
4942    #[gpui::test]
4943    fn test_select_all(cx: &mut gpui::MutableAppContext) {
4944        let buffer = cx.add_model(|cx| Buffer::new(0, "abc\nde\nfgh", cx));
4945        let settings = EditorSettings::test(&cx);
4946        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
4947        view.update(cx, |view, cx| {
4948            view.select_all(&SelectAll, cx);
4949            assert_eq!(
4950                view.selection_ranges(cx),
4951                &[DisplayPoint::new(0, 0)..DisplayPoint::new(2, 3)]
4952            );
4953        });
4954    }
4955
4956    #[gpui::test]
4957    fn test_select_line(cx: &mut gpui::MutableAppContext) {
4958        let settings = EditorSettings::test(&cx);
4959        let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(6, 5), cx));
4960        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
4961        view.update(cx, |view, cx| {
4962            view.select_display_ranges(
4963                &[
4964                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 1),
4965                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
4966                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
4967                    DisplayPoint::new(4, 2)..DisplayPoint::new(4, 2),
4968                ],
4969                cx,
4970            )
4971            .unwrap();
4972            view.select_line(&SelectLine, cx);
4973            assert_eq!(
4974                view.selection_ranges(cx),
4975                vec![
4976                    DisplayPoint::new(0, 0)..DisplayPoint::new(2, 0),
4977                    DisplayPoint::new(4, 0)..DisplayPoint::new(5, 0),
4978                ]
4979            );
4980        });
4981
4982        view.update(cx, |view, cx| {
4983            view.select_line(&SelectLine, cx);
4984            assert_eq!(
4985                view.selection_ranges(cx),
4986                vec![
4987                    DisplayPoint::new(0, 0)..DisplayPoint::new(3, 0),
4988                    DisplayPoint::new(4, 0)..DisplayPoint::new(5, 5),
4989                ]
4990            );
4991        });
4992
4993        view.update(cx, |view, cx| {
4994            view.select_line(&SelectLine, cx);
4995            assert_eq!(
4996                view.selection_ranges(cx),
4997                vec![DisplayPoint::new(0, 0)..DisplayPoint::new(5, 5)]
4998            );
4999        });
5000    }
5001
5002    #[gpui::test]
5003    fn test_split_selection_into_lines(cx: &mut gpui::MutableAppContext) {
5004        let settings = EditorSettings::test(&cx);
5005        let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(9, 5), cx));
5006        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
5007        view.update(cx, |view, cx| {
5008            view.fold_ranges(
5009                vec![
5010                    Point::new(0, 2)..Point::new(1, 2),
5011                    Point::new(2, 3)..Point::new(4, 1),
5012                    Point::new(7, 0)..Point::new(8, 4),
5013                ],
5014                cx,
5015            );
5016            view.select_display_ranges(
5017                &[
5018                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 1),
5019                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
5020                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
5021                    DisplayPoint::new(4, 4)..DisplayPoint::new(4, 4),
5022                ],
5023                cx,
5024            )
5025            .unwrap();
5026            assert_eq!(view.display_text(cx), "aa…bbb\nccc…eeee\nfffff\nggggg\n…i");
5027        });
5028
5029        view.update(cx, |view, cx| {
5030            view.split_selection_into_lines(&SplitSelectionIntoLines, cx);
5031            assert_eq!(
5032                view.display_text(cx),
5033                "aaaaa\nbbbbb\nccc…eeee\nfffff\nggggg\n…i"
5034            );
5035            assert_eq!(
5036                view.selection_ranges(cx),
5037                [
5038                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1),
5039                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
5040                    DisplayPoint::new(2, 0)..DisplayPoint::new(2, 0),
5041                    DisplayPoint::new(5, 4)..DisplayPoint::new(5, 4)
5042                ]
5043            );
5044        });
5045
5046        view.update(cx, |view, cx| {
5047            view.select_display_ranges(&[DisplayPoint::new(5, 0)..DisplayPoint::new(0, 1)], cx)
5048                .unwrap();
5049            view.split_selection_into_lines(&SplitSelectionIntoLines, cx);
5050            assert_eq!(
5051                view.display_text(cx),
5052                "aaaaa\nbbbbb\nccccc\nddddd\neeeee\nfffff\nggggg\nhhhhh\niiiii"
5053            );
5054            assert_eq!(
5055                view.selection_ranges(cx),
5056                [
5057                    DisplayPoint::new(0, 5)..DisplayPoint::new(0, 5),
5058                    DisplayPoint::new(1, 5)..DisplayPoint::new(1, 5),
5059                    DisplayPoint::new(2, 5)..DisplayPoint::new(2, 5),
5060                    DisplayPoint::new(3, 5)..DisplayPoint::new(3, 5),
5061                    DisplayPoint::new(4, 5)..DisplayPoint::new(4, 5),
5062                    DisplayPoint::new(5, 5)..DisplayPoint::new(5, 5),
5063                    DisplayPoint::new(6, 5)..DisplayPoint::new(6, 5),
5064                    DisplayPoint::new(7, 0)..DisplayPoint::new(7, 0)
5065                ]
5066            );
5067        });
5068    }
5069
5070    #[gpui::test]
5071    fn test_add_selection_above_below(cx: &mut gpui::MutableAppContext) {
5072        let settings = EditorSettings::test(&cx);
5073        let buffer = cx.add_model(|cx| Buffer::new(0, "abc\ndefghi\n\njk\nlmno\n", cx));
5074        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
5075
5076        view.update(cx, |view, cx| {
5077            view.select_display_ranges(&[DisplayPoint::new(1, 3)..DisplayPoint::new(1, 3)], cx)
5078                .unwrap();
5079        });
5080        view.update(cx, |view, cx| {
5081            view.add_selection_above(&AddSelectionAbove, cx);
5082            assert_eq!(
5083                view.selection_ranges(cx),
5084                vec![
5085                    DisplayPoint::new(0, 3)..DisplayPoint::new(0, 3),
5086                    DisplayPoint::new(1, 3)..DisplayPoint::new(1, 3)
5087                ]
5088            );
5089        });
5090
5091        view.update(cx, |view, cx| {
5092            view.add_selection_above(&AddSelectionAbove, cx);
5093            assert_eq!(
5094                view.selection_ranges(cx),
5095                vec![
5096                    DisplayPoint::new(0, 3)..DisplayPoint::new(0, 3),
5097                    DisplayPoint::new(1, 3)..DisplayPoint::new(1, 3)
5098                ]
5099            );
5100        });
5101
5102        view.update(cx, |view, cx| {
5103            view.add_selection_below(&AddSelectionBelow, cx);
5104            assert_eq!(
5105                view.selection_ranges(cx),
5106                vec![DisplayPoint::new(1, 3)..DisplayPoint::new(1, 3)]
5107            );
5108        });
5109
5110        view.update(cx, |view, cx| {
5111            view.add_selection_below(&AddSelectionBelow, cx);
5112            assert_eq!(
5113                view.selection_ranges(cx),
5114                vec![
5115                    DisplayPoint::new(1, 3)..DisplayPoint::new(1, 3),
5116                    DisplayPoint::new(4, 3)..DisplayPoint::new(4, 3)
5117                ]
5118            );
5119        });
5120
5121        view.update(cx, |view, cx| {
5122            view.add_selection_below(&AddSelectionBelow, cx);
5123            assert_eq!(
5124                view.selection_ranges(cx),
5125                vec![
5126                    DisplayPoint::new(1, 3)..DisplayPoint::new(1, 3),
5127                    DisplayPoint::new(4, 3)..DisplayPoint::new(4, 3)
5128                ]
5129            );
5130        });
5131
5132        view.update(cx, |view, cx| {
5133            view.select_display_ranges(&[DisplayPoint::new(1, 4)..DisplayPoint::new(1, 3)], cx)
5134                .unwrap();
5135        });
5136        view.update(cx, |view, cx| {
5137            view.add_selection_below(&AddSelectionBelow, cx);
5138            assert_eq!(
5139                view.selection_ranges(cx),
5140                vec![
5141                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 3),
5142                    DisplayPoint::new(4, 4)..DisplayPoint::new(4, 3)
5143                ]
5144            );
5145        });
5146
5147        view.update(cx, |view, cx| {
5148            view.add_selection_below(&AddSelectionBelow, cx);
5149            assert_eq!(
5150                view.selection_ranges(cx),
5151                vec![
5152                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 3),
5153                    DisplayPoint::new(4, 4)..DisplayPoint::new(4, 3)
5154                ]
5155            );
5156        });
5157
5158        view.update(cx, |view, cx| {
5159            view.add_selection_above(&AddSelectionAbove, cx);
5160            assert_eq!(
5161                view.selection_ranges(cx),
5162                vec![DisplayPoint::new(1, 4)..DisplayPoint::new(1, 3)]
5163            );
5164        });
5165
5166        view.update(cx, |view, cx| {
5167            view.add_selection_above(&AddSelectionAbove, cx);
5168            assert_eq!(
5169                view.selection_ranges(cx),
5170                vec![DisplayPoint::new(1, 4)..DisplayPoint::new(1, 3)]
5171            );
5172        });
5173
5174        view.update(cx, |view, cx| {
5175            view.select_display_ranges(&[DisplayPoint::new(0, 1)..DisplayPoint::new(1, 4)], cx)
5176                .unwrap();
5177            view.add_selection_below(&AddSelectionBelow, cx);
5178            assert_eq!(
5179                view.selection_ranges(cx),
5180                vec![
5181                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 3),
5182                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 4),
5183                    DisplayPoint::new(3, 1)..DisplayPoint::new(3, 2),
5184                ]
5185            );
5186        });
5187
5188        view.update(cx, |view, cx| {
5189            view.add_selection_below(&AddSelectionBelow, cx);
5190            assert_eq!(
5191                view.selection_ranges(cx),
5192                vec![
5193                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 3),
5194                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 4),
5195                    DisplayPoint::new(3, 1)..DisplayPoint::new(3, 2),
5196                    DisplayPoint::new(4, 1)..DisplayPoint::new(4, 4),
5197                ]
5198            );
5199        });
5200
5201        view.update(cx, |view, cx| {
5202            view.add_selection_above(&AddSelectionAbove, cx);
5203            assert_eq!(
5204                view.selection_ranges(cx),
5205                vec![
5206                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 3),
5207                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 4),
5208                    DisplayPoint::new(3, 1)..DisplayPoint::new(3, 2),
5209                ]
5210            );
5211        });
5212
5213        view.update(cx, |view, cx| {
5214            view.select_display_ranges(&[DisplayPoint::new(4, 3)..DisplayPoint::new(1, 1)], cx)
5215                .unwrap();
5216        });
5217        view.update(cx, |view, cx| {
5218            view.add_selection_above(&AddSelectionAbove, cx);
5219            assert_eq!(
5220                view.selection_ranges(cx),
5221                vec![
5222                    DisplayPoint::new(0, 3)..DisplayPoint::new(0, 1),
5223                    DisplayPoint::new(1, 3)..DisplayPoint::new(1, 1),
5224                    DisplayPoint::new(3, 2)..DisplayPoint::new(3, 1),
5225                    DisplayPoint::new(4, 3)..DisplayPoint::new(4, 1),
5226                ]
5227            );
5228        });
5229
5230        view.update(cx, |view, cx| {
5231            view.add_selection_below(&AddSelectionBelow, cx);
5232            assert_eq!(
5233                view.selection_ranges(cx),
5234                vec![
5235                    DisplayPoint::new(1, 3)..DisplayPoint::new(1, 1),
5236                    DisplayPoint::new(3, 2)..DisplayPoint::new(3, 1),
5237                    DisplayPoint::new(4, 3)..DisplayPoint::new(4, 1),
5238                ]
5239            );
5240        });
5241    }
5242
5243    #[gpui::test]
5244    async fn test_select_larger_smaller_syntax_node(mut cx: gpui::TestAppContext) {
5245        let settings = cx.read(EditorSettings::test);
5246        let language = Some(Arc::new(Language::new(
5247            LanguageConfig::default(),
5248            Some(tree_sitter_rust::language()),
5249        )));
5250
5251        let text = r#"
5252            use mod1::mod2::{mod3, mod4};
5253
5254            fn fn_1(param1: bool, param2: &str) {
5255                let var1 = "text";
5256            }
5257        "#
5258        .unindent();
5259
5260        let buffer = cx.add_model(|cx| Buffer::new(0, text, cx).with_language(language, None, cx));
5261        let (_, view) = cx.add_window(|cx| build_editor(buffer, settings, cx));
5262        view.condition(&cx, |view, cx| !view.buffer.read(cx).is_parsing())
5263            .await;
5264
5265        view.update(&mut cx, |view, cx| {
5266            view.select_display_ranges(
5267                &[
5268                    DisplayPoint::new(0, 25)..DisplayPoint::new(0, 25),
5269                    DisplayPoint::new(2, 24)..DisplayPoint::new(2, 12),
5270                    DisplayPoint::new(3, 18)..DisplayPoint::new(3, 18),
5271                ],
5272                cx,
5273            )
5274            .unwrap();
5275            view.select_larger_syntax_node(&SelectLargerSyntaxNode, cx);
5276        });
5277        assert_eq!(
5278            view.update(&mut cx, |view, cx| view.selection_ranges(cx)),
5279            &[
5280                DisplayPoint::new(0, 23)..DisplayPoint::new(0, 27),
5281                DisplayPoint::new(2, 35)..DisplayPoint::new(2, 7),
5282                DisplayPoint::new(3, 15)..DisplayPoint::new(3, 21),
5283            ]
5284        );
5285
5286        view.update(&mut cx, |view, cx| {
5287            view.select_larger_syntax_node(&SelectLargerSyntaxNode, cx);
5288        });
5289        assert_eq!(
5290            view.update(&mut cx, |view, cx| view.selection_ranges(cx)),
5291            &[
5292                DisplayPoint::new(0, 16)..DisplayPoint::new(0, 28),
5293                DisplayPoint::new(4, 1)..DisplayPoint::new(2, 0),
5294            ]
5295        );
5296
5297        view.update(&mut cx, |view, cx| {
5298            view.select_larger_syntax_node(&SelectLargerSyntaxNode, cx);
5299        });
5300        assert_eq!(
5301            view.update(&mut cx, |view, cx| view.selection_ranges(cx)),
5302            &[DisplayPoint::new(5, 0)..DisplayPoint::new(0, 0)]
5303        );
5304
5305        // Trying to expand the selected syntax node one more time has no effect.
5306        view.update(&mut cx, |view, cx| {
5307            view.select_larger_syntax_node(&SelectLargerSyntaxNode, cx);
5308        });
5309        assert_eq!(
5310            view.update(&mut cx, |view, cx| view.selection_ranges(cx)),
5311            &[DisplayPoint::new(5, 0)..DisplayPoint::new(0, 0)]
5312        );
5313
5314        view.update(&mut cx, |view, cx| {
5315            view.select_smaller_syntax_node(&SelectSmallerSyntaxNode, cx);
5316        });
5317        assert_eq!(
5318            view.update(&mut cx, |view, cx| view.selection_ranges(cx)),
5319            &[
5320                DisplayPoint::new(0, 16)..DisplayPoint::new(0, 28),
5321                DisplayPoint::new(4, 1)..DisplayPoint::new(2, 0),
5322            ]
5323        );
5324
5325        view.update(&mut cx, |view, cx| {
5326            view.select_smaller_syntax_node(&SelectSmallerSyntaxNode, cx);
5327        });
5328        assert_eq!(
5329            view.update(&mut cx, |view, cx| view.selection_ranges(cx)),
5330            &[
5331                DisplayPoint::new(0, 23)..DisplayPoint::new(0, 27),
5332                DisplayPoint::new(2, 35)..DisplayPoint::new(2, 7),
5333                DisplayPoint::new(3, 15)..DisplayPoint::new(3, 21),
5334            ]
5335        );
5336
5337        view.update(&mut cx, |view, cx| {
5338            view.select_smaller_syntax_node(&SelectSmallerSyntaxNode, cx);
5339        });
5340        assert_eq!(
5341            view.update(&mut cx, |view, cx| view.selection_ranges(cx)),
5342            &[
5343                DisplayPoint::new(0, 25)..DisplayPoint::new(0, 25),
5344                DisplayPoint::new(2, 24)..DisplayPoint::new(2, 12),
5345                DisplayPoint::new(3, 18)..DisplayPoint::new(3, 18),
5346            ]
5347        );
5348
5349        // Trying to shrink the selected syntax node one more time has no effect.
5350        view.update(&mut cx, |view, cx| {
5351            view.select_smaller_syntax_node(&SelectSmallerSyntaxNode, cx);
5352        });
5353        assert_eq!(
5354            view.update(&mut cx, |view, cx| view.selection_ranges(cx)),
5355            &[
5356                DisplayPoint::new(0, 25)..DisplayPoint::new(0, 25),
5357                DisplayPoint::new(2, 24)..DisplayPoint::new(2, 12),
5358                DisplayPoint::new(3, 18)..DisplayPoint::new(3, 18),
5359            ]
5360        );
5361
5362        // Ensure that we keep expanding the selection if the larger selection starts or ends within
5363        // a fold.
5364        view.update(&mut cx, |view, cx| {
5365            view.fold_ranges(
5366                vec![
5367                    Point::new(0, 21)..Point::new(0, 24),
5368                    Point::new(3, 20)..Point::new(3, 22),
5369                ],
5370                cx,
5371            );
5372            view.select_larger_syntax_node(&SelectLargerSyntaxNode, cx);
5373        });
5374        assert_eq!(
5375            view.update(&mut cx, |view, cx| view.selection_ranges(cx)),
5376            &[
5377                DisplayPoint::new(0, 16)..DisplayPoint::new(0, 28),
5378                DisplayPoint::new(2, 35)..DisplayPoint::new(2, 7),
5379                DisplayPoint::new(3, 4)..DisplayPoint::new(3, 23),
5380            ]
5381        );
5382    }
5383
5384    #[gpui::test]
5385    async fn test_autoclose_pairs(mut cx: gpui::TestAppContext) {
5386        let settings = cx.read(EditorSettings::test);
5387        let language = Some(Arc::new(Language::new(
5388            LanguageConfig {
5389                brackets: vec![
5390                    BracketPair {
5391                        start: "{".to_string(),
5392                        end: "}".to_string(),
5393                        close: true,
5394                        newline: true,
5395                    },
5396                    BracketPair {
5397                        start: "/*".to_string(),
5398                        end: " */".to_string(),
5399                        close: true,
5400                        newline: true,
5401                    },
5402                ],
5403                ..Default::default()
5404            },
5405            Some(tree_sitter_rust::language()),
5406        )));
5407
5408        let text = r#"
5409            a
5410
5411            /
5412
5413        "#
5414        .unindent();
5415
5416        let buffer = cx.add_model(|cx| Buffer::new(0, text, cx).with_language(language, None, cx));
5417        let (_, view) = cx.add_window(|cx| build_editor(buffer, settings, cx));
5418        view.condition(&cx, |view, cx| !view.buffer.read(cx).is_parsing())
5419            .await;
5420
5421        view.update(&mut cx, |view, cx| {
5422            view.select_display_ranges(
5423                &[
5424                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 1),
5425                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
5426                ],
5427                cx,
5428            )
5429            .unwrap();
5430            view.handle_input(&Input("{".to_string()), cx);
5431            view.handle_input(&Input("{".to_string()), cx);
5432            view.handle_input(&Input("{".to_string()), cx);
5433            assert_eq!(
5434                view.text(cx),
5435                "
5436                {{{}}}
5437                {{{}}}
5438                /
5439
5440                "
5441                .unindent()
5442            );
5443
5444            view.move_right(&MoveRight, cx);
5445            view.handle_input(&Input("}".to_string()), cx);
5446            view.handle_input(&Input("}".to_string()), cx);
5447            view.handle_input(&Input("}".to_string()), cx);
5448            assert_eq!(
5449                view.text(cx),
5450                "
5451                {{{}}}}
5452                {{{}}}}
5453                /
5454
5455                "
5456                .unindent()
5457            );
5458
5459            view.undo(&Undo, cx);
5460            view.handle_input(&Input("/".to_string()), cx);
5461            view.handle_input(&Input("*".to_string()), cx);
5462            assert_eq!(
5463                view.text(cx),
5464                "
5465                /* */
5466                /* */
5467                /
5468
5469                "
5470                .unindent()
5471            );
5472
5473            view.undo(&Undo, cx);
5474            view.select_display_ranges(
5475                &[
5476                    DisplayPoint::new(2, 1)..DisplayPoint::new(2, 1),
5477                    DisplayPoint::new(3, 0)..DisplayPoint::new(3, 0),
5478                ],
5479                cx,
5480            )
5481            .unwrap();
5482            view.handle_input(&Input("*".to_string()), cx);
5483            assert_eq!(
5484                view.text(cx),
5485                "
5486                a
5487
5488                /*
5489                *
5490                "
5491                .unindent()
5492            );
5493        });
5494    }
5495
5496    #[gpui::test]
5497    async fn test_toggle_comment(mut cx: gpui::TestAppContext) {
5498        let settings = cx.read(EditorSettings::test);
5499        let language = Some(Arc::new(Language::new(
5500            LanguageConfig {
5501                line_comment: Some("// ".to_string()),
5502                ..Default::default()
5503            },
5504            Some(tree_sitter_rust::language()),
5505        )));
5506
5507        let text = "
5508            fn a() {
5509                //b();
5510                // c();
5511                //  d();
5512            }
5513        "
5514        .unindent();
5515
5516        let buffer = cx.add_model(|cx| Buffer::new(0, text, cx).with_language(language, None, cx));
5517        let (_, view) = cx.add_window(|cx| build_editor(buffer, settings, cx));
5518
5519        view.update(&mut cx, |editor, cx| {
5520            // If multiple selections intersect a line, the line is only
5521            // toggled once.
5522            editor
5523                .select_display_ranges(
5524                    &[
5525                        DisplayPoint::new(1, 3)..DisplayPoint::new(2, 3),
5526                        DisplayPoint::new(3, 5)..DisplayPoint::new(3, 6),
5527                    ],
5528                    cx,
5529                )
5530                .unwrap();
5531            editor.toggle_comments(&ToggleComments, cx);
5532            assert_eq!(
5533                editor.text(cx),
5534                "
5535                    fn a() {
5536                        b();
5537                        c();
5538                         d();
5539                    }
5540                "
5541                .unindent()
5542            );
5543
5544            // The comment prefix is inserted at the same column for every line
5545            // in a selection.
5546            editor
5547                .select_display_ranges(&[DisplayPoint::new(1, 3)..DisplayPoint::new(3, 6)], cx)
5548                .unwrap();
5549            editor.toggle_comments(&ToggleComments, cx);
5550            assert_eq!(
5551                editor.text(cx),
5552                "
5553                    fn a() {
5554                        // b();
5555                        // c();
5556                        //  d();
5557                    }
5558                "
5559                .unindent()
5560            );
5561
5562            // If a selection ends at the beginning of a line, that line is not toggled.
5563            editor
5564                .select_display_ranges(&[DisplayPoint::new(2, 0)..DisplayPoint::new(3, 0)], cx)
5565                .unwrap();
5566            editor.toggle_comments(&ToggleComments, cx);
5567            assert_eq!(
5568                editor.text(cx),
5569                "
5570                        fn a() {
5571                            // b();
5572                            c();
5573                            //  d();
5574                        }
5575                    "
5576                .unindent()
5577            );
5578        });
5579    }
5580
5581    #[gpui::test]
5582    async fn test_extra_newline_insertion(mut cx: gpui::TestAppContext) {
5583        let settings = cx.read(EditorSettings::test);
5584        let language = Some(Arc::new(Language::new(
5585            LanguageConfig {
5586                brackets: vec![
5587                    BracketPair {
5588                        start: "{".to_string(),
5589                        end: "}".to_string(),
5590                        close: true,
5591                        newline: true,
5592                    },
5593                    BracketPair {
5594                        start: "/* ".to_string(),
5595                        end: " */".to_string(),
5596                        close: true,
5597                        newline: true,
5598                    },
5599                ],
5600                ..Default::default()
5601            },
5602            Some(tree_sitter_rust::language()),
5603        )));
5604
5605        let text = concat!(
5606            "{   }\n",     // Suppress rustfmt
5607            "  x\n",       //
5608            "  /*   */\n", //
5609            "x\n",         //
5610            "{{} }\n",     //
5611        );
5612
5613        let buffer = cx.add_model(|cx| Buffer::new(0, text, cx).with_language(language, None, cx));
5614        let (_, view) = cx.add_window(|cx| build_editor(buffer, settings, cx));
5615        view.condition(&cx, |view, cx| !view.buffer.read(cx).is_parsing())
5616            .await;
5617
5618        view.update(&mut cx, |view, cx| {
5619            view.select_display_ranges(
5620                &[
5621                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 3),
5622                    DisplayPoint::new(2, 5)..DisplayPoint::new(2, 5),
5623                    DisplayPoint::new(4, 4)..DisplayPoint::new(4, 4),
5624                ],
5625                cx,
5626            )
5627            .unwrap();
5628            view.newline(&Newline, cx);
5629
5630            assert_eq!(
5631                view.buffer().read(cx).text(),
5632                concat!(
5633                    "{ \n",    // Suppress rustfmt
5634                    "\n",      //
5635                    "}\n",     //
5636                    "  x\n",   //
5637                    "  /* \n", //
5638                    "  \n",    //
5639                    "  */\n",  //
5640                    "x\n",     //
5641                    "{{} \n",  //
5642                    "}\n",     //
5643                )
5644            );
5645        });
5646    }
5647
5648    impl Editor {
5649        fn selection_ranges(&self, cx: &mut MutableAppContext) -> Vec<Range<DisplayPoint>> {
5650            self.intersecting_selections(
5651                self.selection_set_id,
5652                DisplayPoint::zero()..self.max_point(cx),
5653                cx,
5654            )
5655            .into_iter()
5656            .map(|s| {
5657                if s.reversed {
5658                    s.end..s.start
5659                } else {
5660                    s.start..s.end
5661                }
5662            })
5663            .collect()
5664        }
5665    }
5666
5667    fn empty_range(row: usize, column: usize) -> Range<DisplayPoint> {
5668        let point = DisplayPoint::new(row as u32, column as u32);
5669        point..point
5670    }
5671
5672    fn build_editor(
5673        buffer: ModelHandle<Buffer>,
5674        settings: EditorSettings,
5675        cx: &mut ViewContext<Editor>,
5676    ) -> Editor {
5677        Editor::for_buffer(buffer, move |_| settings.clone(), cx)
5678    }
5679}
5680
5681trait RangeExt<T> {
5682    fn sorted(&self) -> Range<T>;
5683    fn to_inclusive(&self) -> RangeInclusive<T>;
5684}
5685
5686impl<T: Ord + Clone> RangeExt<T> for Range<T> {
5687    fn sorted(&self) -> Self {
5688        cmp::min(&self.start, &self.end).clone()..cmp::max(&self.start, &self.end).clone()
5689    }
5690
5691    fn to_inclusive(&self) -> RangeInclusive<T> {
5692        self.start.clone()..=self.end.clone()
5693    }
5694}