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::<_, usize>(search_start..buffer.len())
2829                .find_map(|entry| {
2830                    if entry.diagnostic.is_primary
2831                        && !entry.range.is_empty()
2832                        && Some(entry.range.end) != active_primary_range.as_ref().map(|r| *r.end())
2833                    {
2834                        Some((entry.range, entry.diagnostic.group_id))
2835                    } else {
2836                        None
2837                    }
2838                });
2839
2840            if let Some((primary_range, group_id)) = next_group {
2841                self.activate_diagnostics(group_id, cx);
2842                self.update_selections(
2843                    vec![Selection {
2844                        id: selection.id,
2845                        start: primary_range.start,
2846                        end: primary_range.start,
2847                        reversed: false,
2848                        goal: SelectionGoal::None,
2849                    }],
2850                    Some(Autoscroll::Center),
2851                    cx,
2852                );
2853                break;
2854            } else if search_start == 0 {
2855                break;
2856            } else {
2857                // Cycle around to the start of the buffer.
2858                search_start = 0;
2859            }
2860        }
2861    }
2862
2863    fn refresh_active_diagnostics(&mut self, cx: &mut ViewContext<Editor>) {
2864        if let Some(active_diagnostics) = self.active_diagnostics.as_mut() {
2865            let buffer = self.buffer.read(cx);
2866            let primary_range_start = active_diagnostics.primary_range.start.to_offset(buffer);
2867            let is_valid = buffer
2868                .diagnostics_in_range::<_, usize>(active_diagnostics.primary_range.clone())
2869                .any(|entry| {
2870                    entry.diagnostic.is_primary
2871                        && !entry.range.is_empty()
2872                        && entry.range.start == primary_range_start
2873                        && entry.diagnostic.message == active_diagnostics.primary_message
2874                });
2875
2876            if is_valid != active_diagnostics.is_valid {
2877                active_diagnostics.is_valid = is_valid;
2878                let mut new_styles = HashMap::new();
2879                for (block_id, diagnostic) in &active_diagnostics.blocks {
2880                    let build_settings = self.build_settings.clone();
2881                    let diagnostic = diagnostic.clone();
2882                    new_styles.insert(*block_id, move |cx: &BlockContext| {
2883                        let diagnostic = diagnostic.clone();
2884                        let settings = build_settings.borrow()(cx.cx);
2885                        render_diagnostic(diagnostic, &settings.style, is_valid, cx.anchor_x)
2886                    });
2887                }
2888                self.display_map
2889                    .update(cx, |display_map, _| display_map.replace_blocks(new_styles));
2890            }
2891        }
2892    }
2893
2894    fn activate_diagnostics(&mut self, group_id: usize, cx: &mut ViewContext<Self>) {
2895        self.dismiss_diagnostics(cx);
2896        self.active_diagnostics = self.display_map.update(cx, |display_map, cx| {
2897            let buffer = self.buffer.read(cx);
2898
2899            let mut primary_range = None;
2900            let mut primary_message = None;
2901            let mut group_end = Point::zero();
2902            let diagnostic_group = buffer
2903                .diagnostic_group::<Point>(group_id)
2904                .map(|entry| {
2905                    if entry.range.end > group_end {
2906                        group_end = entry.range.end;
2907                    }
2908                    if entry.diagnostic.is_primary {
2909                        primary_range = Some(entry.range.clone());
2910                        primary_message = Some(entry.diagnostic.message.clone());
2911                    }
2912                    entry
2913                })
2914                .collect::<Vec<_>>();
2915            let primary_range = primary_range.unwrap();
2916            let primary_message = primary_message.unwrap();
2917            let primary_range =
2918                buffer.anchor_after(primary_range.start)..buffer.anchor_before(primary_range.end);
2919
2920            let blocks = display_map
2921                .insert_blocks(
2922                    diagnostic_group.iter().map(|entry| {
2923                        let build_settings = self.build_settings.clone();
2924                        let diagnostic = entry.diagnostic.clone();
2925                        let message_height = diagnostic.message.lines().count() as u8;
2926
2927                        BlockProperties {
2928                            position: entry.range.start,
2929                            height: message_height,
2930                            render: Arc::new(move |cx| {
2931                                let settings = build_settings.borrow()(cx.cx);
2932                                let diagnostic = diagnostic.clone();
2933                                render_diagnostic(diagnostic, &settings.style, true, cx.anchor_x)
2934                            }),
2935                            disposition: BlockDisposition::Below,
2936                        }
2937                    }),
2938                    cx,
2939                )
2940                .into_iter()
2941                .zip(diagnostic_group.into_iter().map(|entry| entry.diagnostic))
2942                .collect();
2943
2944            Some(ActiveDiagnosticGroup {
2945                primary_range,
2946                primary_message,
2947                blocks,
2948                is_valid: true,
2949            })
2950        });
2951    }
2952
2953    fn dismiss_diagnostics(&mut self, cx: &mut ViewContext<Self>) {
2954        if let Some(active_diagnostic_group) = self.active_diagnostics.take() {
2955            self.display_map.update(cx, |display_map, cx| {
2956                display_map.remove_blocks(active_diagnostic_group.blocks.into_keys().collect(), cx);
2957            });
2958            cx.notify();
2959        }
2960    }
2961
2962    fn build_columnar_selection(
2963        &mut self,
2964        display_map: &DisplayMapSnapshot,
2965        row: u32,
2966        columns: &Range<u32>,
2967        reversed: bool,
2968    ) -> Option<Selection<Point>> {
2969        let is_empty = columns.start == columns.end;
2970        let line_len = display_map.line_len(row);
2971        if columns.start < line_len || (is_empty && columns.start == line_len) {
2972            let start = DisplayPoint::new(row, columns.start);
2973            let end = DisplayPoint::new(row, cmp::min(columns.end, line_len));
2974            Some(Selection {
2975                id: post_inc(&mut self.next_selection_id),
2976                start: start.to_point(display_map),
2977                end: end.to_point(display_map),
2978                reversed,
2979                goal: SelectionGoal::ColumnRange {
2980                    start: columns.start,
2981                    end: columns.end,
2982                },
2983            })
2984        } else {
2985            None
2986        }
2987    }
2988
2989    pub fn active_selection_sets<'a>(
2990        &'a self,
2991        cx: &'a AppContext,
2992    ) -> impl 'a + Iterator<Item = SelectionSetId> {
2993        let buffer = self.buffer.read(cx);
2994        let replica_id = buffer.replica_id();
2995        buffer
2996            .selection_sets()
2997            .filter(move |(set_id, set)| {
2998                set.active && (set_id.replica_id != replica_id || **set_id == self.selection_set_id)
2999            })
3000            .map(|(set_id, _)| *set_id)
3001    }
3002
3003    pub fn intersecting_selections<'a>(
3004        &'a self,
3005        set_id: SelectionSetId,
3006        range: Range<DisplayPoint>,
3007        cx: &'a mut MutableAppContext,
3008    ) -> impl 'a + Iterator<Item = Selection<DisplayPoint>> {
3009        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3010        let buffer = self.buffer.read(cx);
3011
3012        let pending_selection = if set_id == self.selection_set_id {
3013            self.pending_selection.as_ref().and_then(|pending| {
3014                let selection_start = pending.selection.start.to_display_point(&display_map);
3015                let selection_end = pending.selection.end.to_display_point(&display_map);
3016                if selection_start <= range.end || selection_end <= range.end {
3017                    Some(Selection {
3018                        id: pending.selection.id,
3019                        start: selection_start,
3020                        end: selection_end,
3021                        reversed: pending.selection.reversed,
3022                        goal: pending.selection.goal,
3023                    })
3024                } else {
3025                    None
3026                }
3027            })
3028        } else {
3029            None
3030        };
3031
3032        let range = (range.start.to_offset(&display_map, Bias::Left), Bias::Left)
3033            ..(range.end.to_offset(&display_map, Bias::Left), Bias::Right);
3034        let selections = self
3035            .buffer
3036            .read(cx)
3037            .selection_set(set_id)
3038            .unwrap()
3039            .intersecting_selections::<Point, _>(range, buffer);
3040
3041        selections
3042            .map(move |s| Selection {
3043                id: s.id,
3044                start: s.start.to_display_point(&display_map),
3045                end: s.end.to_display_point(&display_map),
3046                reversed: s.reversed,
3047                goal: s.goal,
3048            })
3049            .chain(pending_selection)
3050    }
3051
3052    pub fn selections<'a, D>(&self, cx: &'a AppContext) -> impl 'a + Iterator<Item = Selection<D>>
3053    where
3054        D: 'a + TextDimension<'a> + Ord,
3055    {
3056        let buffer = self.buffer.read(cx);
3057        let mut selections = self.selection_set(cx).selections::<D>(buffer).peekable();
3058        let mut pending_selection = self.pending_selection(cx);
3059        iter::from_fn(move || {
3060            if let Some(pending) = pending_selection.as_mut() {
3061                while let Some(next_selection) = selections.peek() {
3062                    if pending.start <= next_selection.end && pending.end >= next_selection.start {
3063                        let next_selection = selections.next().unwrap();
3064                        if next_selection.start < pending.start {
3065                            pending.start = next_selection.start;
3066                        }
3067                        if next_selection.end > pending.end {
3068                            pending.end = next_selection.end;
3069                        }
3070                    } else if next_selection.end < pending.start {
3071                        return selections.next();
3072                    } else {
3073                        break;
3074                    }
3075                }
3076
3077                pending_selection.take()
3078            } else {
3079                selections.next()
3080            }
3081        })
3082    }
3083
3084    fn pending_selection<'a, D>(&self, cx: &'a AppContext) -> Option<Selection<D>>
3085    where
3086        D: 'a + TextDimension<'a>,
3087    {
3088        let buffer = self.buffer.read(cx);
3089        self.pending_selection.as_ref().map(|pending| Selection {
3090            id: pending.selection.id,
3091            start: pending.selection.start.summary::<D>(buffer),
3092            end: pending.selection.end.summary::<D>(buffer),
3093            reversed: pending.selection.reversed,
3094            goal: pending.selection.goal,
3095        })
3096    }
3097
3098    fn selection_count<'a>(&self, cx: &'a AppContext) -> usize {
3099        let mut selection_count = self.selection_set(cx).len();
3100        if self.pending_selection.is_some() {
3101            selection_count += 1;
3102        }
3103        selection_count
3104    }
3105
3106    pub fn oldest_selection<'a, T>(&self, cx: &'a AppContext) -> Selection<T>
3107    where
3108        T: 'a + TextDimension<'a>,
3109    {
3110        let buffer = self.buffer.read(cx);
3111        self.selection_set(cx)
3112            .oldest_selection(buffer)
3113            .or_else(|| self.pending_selection(cx))
3114            .unwrap()
3115    }
3116
3117    pub fn newest_selection<'a, T>(&self, cx: &'a AppContext) -> Selection<T>
3118    where
3119        T: 'a + TextDimension<'a>,
3120    {
3121        let buffer = self.buffer.read(cx);
3122        self.pending_selection(cx)
3123            .or_else(|| self.selection_set(cx).newest_selection(buffer))
3124            .unwrap()
3125    }
3126
3127    fn selection_set<'a>(&self, cx: &'a AppContext) -> &'a SelectionSet {
3128        self.buffer
3129            .read(cx)
3130            .selection_set(self.selection_set_id)
3131            .unwrap()
3132    }
3133
3134    pub fn update_selections<T>(
3135        &mut self,
3136        mut selections: Vec<Selection<T>>,
3137        autoscroll: Option<Autoscroll>,
3138        cx: &mut ViewContext<Self>,
3139    ) where
3140        T: ToOffset + ToPoint + Ord + std::marker::Copy + std::fmt::Debug,
3141    {
3142        // Merge overlapping selections.
3143        let buffer = self.buffer.read(cx);
3144        let mut i = 1;
3145        while i < selections.len() {
3146            if selections[i - 1].end >= selections[i].start {
3147                let removed = selections.remove(i);
3148                if removed.start < selections[i - 1].start {
3149                    selections[i - 1].start = removed.start;
3150                }
3151                if removed.end > selections[i - 1].end {
3152                    selections[i - 1].end = removed.end;
3153                }
3154            } else {
3155                i += 1;
3156            }
3157        }
3158
3159        self.pending_selection = None;
3160        self.add_selections_state = None;
3161        self.select_next_state = None;
3162        self.select_larger_syntax_node_stack.clear();
3163        while let Some(autoclose_pair) = self.autoclose_stack.last() {
3164            let all_selections_inside_autoclose_ranges =
3165                if selections.len() == autoclose_pair.ranges.len() {
3166                    selections
3167                        .iter()
3168                        .zip(autoclose_pair.ranges.iter().map(|r| r.to_point(buffer)))
3169                        .all(|(selection, autoclose_range)| {
3170                            let head = selection.head().to_point(&*buffer);
3171                            autoclose_range.start <= head && autoclose_range.end >= head
3172                        })
3173                } else {
3174                    false
3175                };
3176
3177            if all_selections_inside_autoclose_ranges {
3178                break;
3179            } else {
3180                self.autoclose_stack.pop();
3181            }
3182        }
3183
3184        if let Some(autoscroll) = autoscroll {
3185            self.request_autoscroll(autoscroll, cx);
3186        }
3187        self.pause_cursor_blinking(cx);
3188
3189        self.buffer.update(cx, |buffer, cx| {
3190            buffer
3191                .update_selection_set(self.selection_set_id, &selections, cx)
3192                .unwrap();
3193        });
3194    }
3195
3196    fn request_autoscroll(&mut self, autoscroll: Autoscroll, cx: &mut ViewContext<Self>) {
3197        self.autoscroll_request = Some(autoscroll);
3198        cx.notify();
3199    }
3200
3201    fn start_transaction(&mut self, cx: &mut ViewContext<Self>) {
3202        self.end_selection(cx);
3203        self.buffer.update(cx, |buffer, _| {
3204            buffer
3205                .start_transaction(Some(self.selection_set_id))
3206                .unwrap()
3207        });
3208    }
3209
3210    fn end_transaction(&self, cx: &mut ViewContext<Self>) {
3211        self.buffer.update(cx, |buffer, cx| {
3212            buffer
3213                .end_transaction(Some(self.selection_set_id), cx)
3214                .unwrap()
3215        });
3216    }
3217
3218    pub fn page_up(&mut self, _: &PageUp, _: &mut ViewContext<Self>) {
3219        log::info!("Editor::page_up");
3220    }
3221
3222    pub fn page_down(&mut self, _: &PageDown, _: &mut ViewContext<Self>) {
3223        log::info!("Editor::page_down");
3224    }
3225
3226    pub fn fold(&mut self, _: &Fold, cx: &mut ViewContext<Self>) {
3227        let mut fold_ranges = Vec::new();
3228
3229        let selections = self.selections::<Point>(cx).collect::<Vec<_>>();
3230        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3231        for selection in selections {
3232            let range = selection.display_range(&display_map).sorted();
3233            let buffer_start_row = range.start.to_point(&display_map).row;
3234
3235            for row in (0..=range.end.row()).rev() {
3236                if self.is_line_foldable(&display_map, row) && !display_map.is_line_folded(row) {
3237                    let fold_range = self.foldable_range_for_line(&display_map, row);
3238                    if fold_range.end.row >= buffer_start_row {
3239                        fold_ranges.push(fold_range);
3240                        if row <= range.start.row() {
3241                            break;
3242                        }
3243                    }
3244                }
3245            }
3246        }
3247
3248        self.fold_ranges(fold_ranges, cx);
3249    }
3250
3251    pub fn unfold(&mut self, _: &Unfold, cx: &mut ViewContext<Self>) {
3252        let selections = self.selections::<Point>(cx).collect::<Vec<_>>();
3253        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
3254        let buffer = self.buffer.read(cx);
3255        let ranges = selections
3256            .iter()
3257            .map(|s| {
3258                let range = s.display_range(&display_map).sorted();
3259                let mut start = range.start.to_point(&display_map);
3260                let mut end = range.end.to_point(&display_map);
3261                start.column = 0;
3262                end.column = buffer.line_len(end.row);
3263                start..end
3264            })
3265            .collect::<Vec<_>>();
3266        self.unfold_ranges(ranges, cx);
3267    }
3268
3269    fn is_line_foldable(&self, display_map: &DisplayMapSnapshot, display_row: u32) -> bool {
3270        let max_point = display_map.max_point();
3271        if display_row >= max_point.row() {
3272            false
3273        } else {
3274            let (start_indent, is_blank) = display_map.line_indent(display_row);
3275            if is_blank {
3276                false
3277            } else {
3278                for display_row in display_row + 1..=max_point.row() {
3279                    let (indent, is_blank) = display_map.line_indent(display_row);
3280                    if !is_blank {
3281                        return indent > start_indent;
3282                    }
3283                }
3284                false
3285            }
3286        }
3287    }
3288
3289    fn foldable_range_for_line(
3290        &self,
3291        display_map: &DisplayMapSnapshot,
3292        start_row: u32,
3293    ) -> Range<Point> {
3294        let max_point = display_map.max_point();
3295
3296        let (start_indent, _) = display_map.line_indent(start_row);
3297        let start = DisplayPoint::new(start_row, display_map.line_len(start_row));
3298        let mut end = None;
3299        for row in start_row + 1..=max_point.row() {
3300            let (indent, is_blank) = display_map.line_indent(row);
3301            if !is_blank && indent <= start_indent {
3302                end = Some(DisplayPoint::new(row - 1, display_map.line_len(row - 1)));
3303                break;
3304            }
3305        }
3306
3307        let end = end.unwrap_or(max_point);
3308        return start.to_point(display_map)..end.to_point(display_map);
3309    }
3310
3311    pub fn fold_selected_ranges(&mut self, _: &FoldSelectedRanges, cx: &mut ViewContext<Self>) {
3312        let selections = self.selections::<Point>(cx);
3313        let ranges = selections.map(|s| s.start..s.end).collect();
3314        self.fold_ranges(ranges, cx);
3315    }
3316
3317    fn fold_ranges<T: ToOffset>(&mut self, ranges: Vec<Range<T>>, cx: &mut ViewContext<Self>) {
3318        if !ranges.is_empty() {
3319            self.display_map.update(cx, |map, cx| map.fold(ranges, cx));
3320            self.request_autoscroll(Autoscroll::Fit, cx);
3321            cx.notify();
3322        }
3323    }
3324
3325    fn unfold_ranges<T: ToOffset>(&mut self, ranges: Vec<Range<T>>, cx: &mut ViewContext<Self>) {
3326        if !ranges.is_empty() {
3327            self.display_map
3328                .update(cx, |map, cx| map.unfold(ranges, cx));
3329            self.request_autoscroll(Autoscroll::Fit, cx);
3330            cx.notify();
3331        }
3332    }
3333
3334    pub fn longest_row(&self, cx: &mut MutableAppContext) -> u32 {
3335        self.display_map
3336            .update(cx, |map, cx| map.snapshot(cx))
3337            .longest_row()
3338    }
3339
3340    pub fn max_point(&self, cx: &mut MutableAppContext) -> DisplayPoint {
3341        self.display_map
3342            .update(cx, |map, cx| map.snapshot(cx))
3343            .max_point()
3344    }
3345
3346    pub fn text(&self, cx: &AppContext) -> String {
3347        self.buffer.read(cx).text()
3348    }
3349
3350    pub fn display_text(&self, cx: &mut MutableAppContext) -> String {
3351        self.display_map
3352            .update(cx, |map, cx| map.snapshot(cx))
3353            .text()
3354    }
3355
3356    pub fn set_wrap_width(&self, width: Option<f32>, cx: &mut MutableAppContext) -> bool {
3357        self.display_map
3358            .update(cx, |map, cx| map.set_wrap_width(width, cx))
3359    }
3360
3361    pub fn set_highlighted_row(&mut self, row: Option<u32>) {
3362        self.highlighted_row = row;
3363    }
3364
3365    pub fn highlighted_row(&mut self) -> Option<u32> {
3366        self.highlighted_row
3367    }
3368
3369    fn next_blink_epoch(&mut self) -> usize {
3370        self.blink_epoch += 1;
3371        self.blink_epoch
3372    }
3373
3374    fn pause_cursor_blinking(&mut self, cx: &mut ViewContext<Self>) {
3375        self.show_local_cursors = true;
3376        cx.notify();
3377
3378        let epoch = self.next_blink_epoch();
3379        cx.spawn(|this, mut cx| {
3380            let this = this.downgrade();
3381            async move {
3382                Timer::after(CURSOR_BLINK_INTERVAL).await;
3383                if let Some(this) = cx.read(|cx| this.upgrade(cx)) {
3384                    this.update(&mut cx, |this, cx| this.resume_cursor_blinking(epoch, cx))
3385                }
3386            }
3387        })
3388        .detach();
3389    }
3390
3391    fn resume_cursor_blinking(&mut self, epoch: usize, cx: &mut ViewContext<Self>) {
3392        if epoch == self.blink_epoch {
3393            self.blinking_paused = false;
3394            self.blink_cursors(epoch, cx);
3395        }
3396    }
3397
3398    fn blink_cursors(&mut self, epoch: usize, cx: &mut ViewContext<Self>) {
3399        if epoch == self.blink_epoch && self.focused && !self.blinking_paused {
3400            self.show_local_cursors = !self.show_local_cursors;
3401            cx.notify();
3402
3403            let epoch = self.next_blink_epoch();
3404            cx.spawn(|this, mut cx| {
3405                let this = this.downgrade();
3406                async move {
3407                    Timer::after(CURSOR_BLINK_INTERVAL).await;
3408                    if let Some(this) = cx.read(|cx| this.upgrade(cx)) {
3409                        this.update(&mut cx, |this, cx| this.blink_cursors(epoch, cx));
3410                    }
3411                }
3412            })
3413            .detach();
3414        }
3415    }
3416
3417    pub fn show_local_cursors(&self) -> bool {
3418        self.show_local_cursors
3419    }
3420
3421    fn on_buffer_changed(&mut self, _: ModelHandle<Buffer>, cx: &mut ViewContext<Self>) {
3422        self.refresh_active_diagnostics(cx);
3423        cx.notify();
3424    }
3425
3426    fn on_buffer_event(
3427        &mut self,
3428        _: ModelHandle<Buffer>,
3429        event: &language::Event,
3430        cx: &mut ViewContext<Self>,
3431    ) {
3432        match event {
3433            language::Event::Edited => cx.emit(Event::Edited),
3434            language::Event::Dirtied => cx.emit(Event::Dirtied),
3435            language::Event::Saved => cx.emit(Event::Saved),
3436            language::Event::FileHandleChanged => cx.emit(Event::FileHandleChanged),
3437            language::Event::Reloaded => cx.emit(Event::FileHandleChanged),
3438            language::Event::Closed => cx.emit(Event::Closed),
3439            _ => {}
3440        }
3441    }
3442
3443    fn on_display_map_changed(&mut self, _: ModelHandle<DisplayMap>, cx: &mut ViewContext<Self>) {
3444        cx.notify();
3445    }
3446}
3447
3448impl Snapshot {
3449    pub fn is_focused(&self) -> bool {
3450        self.is_focused
3451    }
3452
3453    pub fn placeholder_text(&self) -> Option<&Arc<str>> {
3454        self.placeholder_text.as_ref()
3455    }
3456
3457    pub fn scroll_position(&self) -> Vector2F {
3458        compute_scroll_position(
3459            &self.display_snapshot,
3460            self.scroll_position,
3461            &self.scroll_top_anchor,
3462        )
3463    }
3464}
3465
3466impl Deref for Snapshot {
3467    type Target = DisplayMapSnapshot;
3468
3469    fn deref(&self) -> &Self::Target {
3470        &self.display_snapshot
3471    }
3472}
3473
3474impl EditorSettings {
3475    #[cfg(any(test, feature = "test-support"))]
3476    pub fn test(cx: &AppContext) -> Self {
3477        Self {
3478            tab_size: 4,
3479            soft_wrap: SoftWrap::None,
3480            style: {
3481                let font_cache: &gpui::FontCache = cx.font_cache();
3482                let font_family_name = Arc::from("Monaco");
3483                let font_properties = Default::default();
3484                let font_family_id = font_cache.load_family(&[&font_family_name]).unwrap();
3485                let font_id = font_cache
3486                    .select_font(font_family_id, &font_properties)
3487                    .unwrap();
3488                EditorStyle {
3489                    text: gpui::fonts::TextStyle {
3490                        font_family_name,
3491                        font_family_id,
3492                        font_id,
3493                        font_size: 14.,
3494                        color: gpui::color::Color::from_u32(0xff0000ff),
3495                        font_properties,
3496                        underline: None,
3497                    },
3498                    placeholder_text: None,
3499                    background: Default::default(),
3500                    gutter_background: Default::default(),
3501                    active_line_background: Default::default(),
3502                    highlighted_line_background: Default::default(),
3503                    line_number: Default::default(),
3504                    line_number_active: Default::default(),
3505                    selection: Default::default(),
3506                    guest_selections: Default::default(),
3507                    syntax: Default::default(),
3508                    error_diagnostic: Default::default(),
3509                    invalid_error_diagnostic: Default::default(),
3510                    warning_diagnostic: Default::default(),
3511                    invalid_warning_diagnostic: Default::default(),
3512                    information_diagnostic: Default::default(),
3513                    invalid_information_diagnostic: Default::default(),
3514                    hint_diagnostic: Default::default(),
3515                    invalid_hint_diagnostic: Default::default(),
3516                }
3517            },
3518        }
3519    }
3520}
3521
3522fn compute_scroll_position(
3523    snapshot: &DisplayMapSnapshot,
3524    mut scroll_position: Vector2F,
3525    scroll_top_anchor: &Anchor,
3526) -> Vector2F {
3527    let scroll_top = scroll_top_anchor.to_display_point(snapshot).row() as f32;
3528    scroll_position.set_y(scroll_top + scroll_position.y());
3529    scroll_position
3530}
3531
3532pub enum Event {
3533    Activate,
3534    Edited,
3535    Blurred,
3536    Dirtied,
3537    Saved,
3538    FileHandleChanged,
3539    Closed,
3540}
3541
3542impl Entity for Editor {
3543    type Event = Event;
3544
3545    fn release(&mut self, cx: &mut MutableAppContext) {
3546        self.buffer.update(cx, |buffer, cx| {
3547            buffer
3548                .remove_selection_set(self.selection_set_id, cx)
3549                .unwrap();
3550        });
3551    }
3552}
3553
3554impl View for Editor {
3555    fn render(&mut self, cx: &mut RenderContext<Self>) -> ElementBox {
3556        let settings = self.build_settings.borrow_mut()(cx);
3557        self.display_map.update(cx, |map, cx| {
3558            map.set_font(
3559                settings.style.text.font_id,
3560                settings.style.text.font_size,
3561                cx,
3562            )
3563        });
3564        EditorElement::new(self.handle.clone(), settings).boxed()
3565    }
3566
3567    fn ui_name() -> &'static str {
3568        "Editor"
3569    }
3570
3571    fn on_focus(&mut self, cx: &mut ViewContext<Self>) {
3572        self.focused = true;
3573        self.blink_cursors(self.blink_epoch, cx);
3574        self.buffer.update(cx, |buffer, cx| {
3575            buffer
3576                .set_active_selection_set(Some(self.selection_set_id), cx)
3577                .unwrap();
3578        });
3579    }
3580
3581    fn on_blur(&mut self, cx: &mut ViewContext<Self>) {
3582        self.focused = false;
3583        self.show_local_cursors = false;
3584        self.buffer.update(cx, |buffer, cx| {
3585            buffer.set_active_selection_set(None, cx).unwrap();
3586        });
3587        cx.emit(Event::Blurred);
3588        cx.notify();
3589    }
3590
3591    fn keymap_context(&self, _: &AppContext) -> gpui::keymap::Context {
3592        let mut cx = Self::default_keymap_context();
3593        let mode = match self.mode {
3594            EditorMode::SingleLine => "single_line",
3595            EditorMode::AutoHeight { .. } => "auto_height",
3596            EditorMode::Full => "full",
3597        };
3598        cx.map.insert("mode".into(), mode.into());
3599        cx
3600    }
3601}
3602
3603impl SelectionExt for Selection<Point> {
3604    fn display_range(&self, map: &DisplayMapSnapshot) -> Range<DisplayPoint> {
3605        let start = self.start.to_display_point(map);
3606        let end = self.end.to_display_point(map);
3607        if self.reversed {
3608            end..start
3609        } else {
3610            start..end
3611        }
3612    }
3613
3614    fn spanned_rows(
3615        &self,
3616        include_end_if_at_line_start: bool,
3617        map: &DisplayMapSnapshot,
3618    ) -> SpannedRows {
3619        let display_start = self.start.to_display_point(map);
3620        let mut display_end = self.end.to_display_point(map);
3621        if !include_end_if_at_line_start
3622            && display_end.row() != map.max_point().row()
3623            && display_start.row() != display_end.row()
3624            && display_end.column() == 0
3625        {
3626            *display_end.row_mut() -= 1;
3627        }
3628
3629        let (display_start, buffer_start) = map.prev_row_boundary(display_start);
3630        let (display_end, buffer_end) = map.next_row_boundary(display_end);
3631
3632        SpannedRows {
3633            buffer_rows: buffer_start.row..buffer_end.row + 1,
3634            display_rows: display_start.row()..display_end.row() + 1,
3635        }
3636    }
3637}
3638
3639fn render_diagnostic(
3640    diagnostic: Diagnostic,
3641    style: &EditorStyle,
3642    valid: bool,
3643    anchor_x: f32,
3644) -> ElementBox {
3645    let mut text_style = style.text.clone();
3646    text_style.color = diagnostic_style(diagnostic.severity, valid, &style).text;
3647    Text::new(diagnostic.message, text_style)
3648        .contained()
3649        .with_margin_left(anchor_x)
3650        .boxed()
3651}
3652
3653pub fn diagnostic_style(
3654    severity: DiagnosticSeverity,
3655    valid: bool,
3656    style: &EditorStyle,
3657) -> DiagnosticStyle {
3658    match (severity, valid) {
3659        (DiagnosticSeverity::ERROR, true) => style.error_diagnostic,
3660        (DiagnosticSeverity::ERROR, false) => style.invalid_error_diagnostic,
3661        (DiagnosticSeverity::WARNING, true) => style.warning_diagnostic,
3662        (DiagnosticSeverity::WARNING, false) => style.invalid_warning_diagnostic,
3663        (DiagnosticSeverity::INFORMATION, true) => style.information_diagnostic,
3664        (DiagnosticSeverity::INFORMATION, false) => style.invalid_information_diagnostic,
3665        (DiagnosticSeverity::HINT, true) => style.hint_diagnostic,
3666        (DiagnosticSeverity::HINT, false) => style.invalid_hint_diagnostic,
3667        _ => Default::default(),
3668    }
3669}
3670
3671#[cfg(test)]
3672mod tests {
3673    use super::*;
3674    use crate::test::sample_text;
3675    use text::Point;
3676    use unindent::Unindent;
3677
3678    #[gpui::test]
3679    fn test_selection_with_mouse(cx: &mut gpui::MutableAppContext) {
3680        let buffer = cx.add_model(|cx| Buffer::new(0, "aaaaaa\nbbbbbb\ncccccc\ndddddd\n", cx));
3681        let settings = EditorSettings::test(cx);
3682        let (_, editor) =
3683            cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
3684
3685        editor.update(cx, |view, cx| {
3686            view.begin_selection(DisplayPoint::new(2, 2), false, 1, cx);
3687        });
3688
3689        assert_eq!(
3690            editor.update(cx, |view, cx| view.selection_ranges(cx)),
3691            [DisplayPoint::new(2, 2)..DisplayPoint::new(2, 2)]
3692        );
3693
3694        editor.update(cx, |view, cx| {
3695            view.update_selection(DisplayPoint::new(3, 3), 0, Vector2F::zero(), cx);
3696        });
3697
3698        assert_eq!(
3699            editor.update(cx, |view, cx| view.selection_ranges(cx)),
3700            [DisplayPoint::new(2, 2)..DisplayPoint::new(3, 3)]
3701        );
3702
3703        editor.update(cx, |view, cx| {
3704            view.update_selection(DisplayPoint::new(1, 1), 0, Vector2F::zero(), cx);
3705        });
3706
3707        assert_eq!(
3708            editor.update(cx, |view, cx| view.selection_ranges(cx)),
3709            [DisplayPoint::new(2, 2)..DisplayPoint::new(1, 1)]
3710        );
3711
3712        editor.update(cx, |view, cx| {
3713            view.end_selection(cx);
3714            view.update_selection(DisplayPoint::new(3, 3), 0, Vector2F::zero(), cx);
3715        });
3716
3717        assert_eq!(
3718            editor.update(cx, |view, cx| view.selection_ranges(cx)),
3719            [DisplayPoint::new(2, 2)..DisplayPoint::new(1, 1)]
3720        );
3721
3722        editor.update(cx, |view, cx| {
3723            view.begin_selection(DisplayPoint::new(3, 3), true, 1, cx);
3724            view.update_selection(DisplayPoint::new(0, 0), 0, Vector2F::zero(), cx);
3725        });
3726
3727        assert_eq!(
3728            editor.update(cx, |view, cx| view.selection_ranges(cx)),
3729            [
3730                DisplayPoint::new(2, 2)..DisplayPoint::new(1, 1),
3731                DisplayPoint::new(3, 3)..DisplayPoint::new(0, 0)
3732            ]
3733        );
3734
3735        editor.update(cx, |view, cx| {
3736            view.end_selection(cx);
3737        });
3738
3739        assert_eq!(
3740            editor.update(cx, |view, cx| view.selection_ranges(cx)),
3741            [DisplayPoint::new(3, 3)..DisplayPoint::new(0, 0)]
3742        );
3743    }
3744
3745    #[gpui::test]
3746    fn test_canceling_pending_selection(cx: &mut gpui::MutableAppContext) {
3747        let buffer = cx.add_model(|cx| Buffer::new(0, "aaaaaa\nbbbbbb\ncccccc\ndddddd\n", cx));
3748        let settings = EditorSettings::test(cx);
3749        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
3750
3751        view.update(cx, |view, cx| {
3752            view.begin_selection(DisplayPoint::new(2, 2), false, 1, cx);
3753            assert_eq!(
3754                view.selection_ranges(cx),
3755                [DisplayPoint::new(2, 2)..DisplayPoint::new(2, 2)]
3756            );
3757        });
3758
3759        view.update(cx, |view, cx| {
3760            view.update_selection(DisplayPoint::new(3, 3), 0, Vector2F::zero(), cx);
3761            assert_eq!(
3762                view.selection_ranges(cx),
3763                [DisplayPoint::new(2, 2)..DisplayPoint::new(3, 3)]
3764            );
3765        });
3766
3767        view.update(cx, |view, cx| {
3768            view.cancel(&Cancel, cx);
3769            view.update_selection(DisplayPoint::new(1, 1), 0, Vector2F::zero(), cx);
3770            assert_eq!(
3771                view.selection_ranges(cx),
3772                [DisplayPoint::new(2, 2)..DisplayPoint::new(3, 3)]
3773            );
3774        });
3775    }
3776
3777    #[gpui::test]
3778    fn test_cancel(cx: &mut gpui::MutableAppContext) {
3779        let buffer = cx.add_model(|cx| Buffer::new(0, "aaaaaa\nbbbbbb\ncccccc\ndddddd\n", cx));
3780        let settings = EditorSettings::test(cx);
3781        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
3782
3783        view.update(cx, |view, cx| {
3784            view.begin_selection(DisplayPoint::new(3, 4), false, 1, cx);
3785            view.update_selection(DisplayPoint::new(1, 1), 0, Vector2F::zero(), cx);
3786            view.end_selection(cx);
3787
3788            view.begin_selection(DisplayPoint::new(0, 1), true, 1, cx);
3789            view.update_selection(DisplayPoint::new(0, 3), 0, Vector2F::zero(), cx);
3790            view.end_selection(cx);
3791            assert_eq!(
3792                view.selection_ranges(cx),
3793                [
3794                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 3),
3795                    DisplayPoint::new(3, 4)..DisplayPoint::new(1, 1),
3796                ]
3797            );
3798        });
3799
3800        view.update(cx, |view, cx| {
3801            view.cancel(&Cancel, cx);
3802            assert_eq!(
3803                view.selection_ranges(cx),
3804                [DisplayPoint::new(3, 4)..DisplayPoint::new(1, 1)]
3805            );
3806        });
3807
3808        view.update(cx, |view, cx| {
3809            view.cancel(&Cancel, cx);
3810            assert_eq!(
3811                view.selection_ranges(cx),
3812                [DisplayPoint::new(1, 1)..DisplayPoint::new(1, 1)]
3813            );
3814        });
3815    }
3816
3817    #[gpui::test]
3818    fn test_fold(cx: &mut gpui::MutableAppContext) {
3819        let buffer = cx.add_model(|cx| {
3820            Buffer::new(
3821                0,
3822                "
3823                    impl Foo {
3824                        // Hello!
3825
3826                        fn a() {
3827                            1
3828                        }
3829
3830                        fn b() {
3831                            2
3832                        }
3833
3834                        fn c() {
3835                            3
3836                        }
3837                    }
3838                "
3839                .unindent(),
3840                cx,
3841            )
3842        });
3843        let settings = EditorSettings::test(&cx);
3844        let (_, view) = cx.add_window(Default::default(), |cx| {
3845            build_editor(buffer.clone(), settings, cx)
3846        });
3847
3848        view.update(cx, |view, cx| {
3849            view.select_display_ranges(&[DisplayPoint::new(8, 0)..DisplayPoint::new(12, 0)], cx)
3850                .unwrap();
3851            view.fold(&Fold, cx);
3852            assert_eq!(
3853                view.display_text(cx),
3854                "
3855                    impl Foo {
3856                        // Hello!
3857
3858                        fn a() {
3859                            1
3860                        }
3861
3862                        fn b() {…
3863                        }
3864
3865                        fn c() {…
3866                        }
3867                    }
3868                "
3869                .unindent(),
3870            );
3871
3872            view.fold(&Fold, cx);
3873            assert_eq!(
3874                view.display_text(cx),
3875                "
3876                    impl Foo {…
3877                    }
3878                "
3879                .unindent(),
3880            );
3881
3882            view.unfold(&Unfold, cx);
3883            assert_eq!(
3884                view.display_text(cx),
3885                "
3886                    impl Foo {
3887                        // Hello!
3888
3889                        fn a() {
3890                            1
3891                        }
3892
3893                        fn b() {…
3894                        }
3895
3896                        fn c() {…
3897                        }
3898                    }
3899                "
3900                .unindent(),
3901            );
3902
3903            view.unfold(&Unfold, cx);
3904            assert_eq!(view.display_text(cx), buffer.read(cx).text());
3905        });
3906    }
3907
3908    #[gpui::test]
3909    fn test_move_cursor(cx: &mut gpui::MutableAppContext) {
3910        let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6), cx));
3911        let settings = EditorSettings::test(&cx);
3912        let (_, view) = cx.add_window(Default::default(), |cx| {
3913            build_editor(buffer.clone(), settings, cx)
3914        });
3915
3916        buffer.update(cx, |buffer, cx| {
3917            buffer.edit(
3918                vec![
3919                    Point::new(1, 0)..Point::new(1, 0),
3920                    Point::new(1, 1)..Point::new(1, 1),
3921                ],
3922                "\t",
3923                cx,
3924            );
3925        });
3926
3927        view.update(cx, |view, cx| {
3928            assert_eq!(
3929                view.selection_ranges(cx),
3930                &[DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0)]
3931            );
3932
3933            view.move_down(&MoveDown, cx);
3934            assert_eq!(
3935                view.selection_ranges(cx),
3936                &[DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0)]
3937            );
3938
3939            view.move_right(&MoveRight, cx);
3940            assert_eq!(
3941                view.selection_ranges(cx),
3942                &[DisplayPoint::new(1, 4)..DisplayPoint::new(1, 4)]
3943            );
3944
3945            view.move_left(&MoveLeft, cx);
3946            assert_eq!(
3947                view.selection_ranges(cx),
3948                &[DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0)]
3949            );
3950
3951            view.move_up(&MoveUp, cx);
3952            assert_eq!(
3953                view.selection_ranges(cx),
3954                &[DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0)]
3955            );
3956
3957            view.move_to_end(&MoveToEnd, cx);
3958            assert_eq!(
3959                view.selection_ranges(cx),
3960                &[DisplayPoint::new(5, 6)..DisplayPoint::new(5, 6)]
3961            );
3962
3963            view.move_to_beginning(&MoveToBeginning, cx);
3964            assert_eq!(
3965                view.selection_ranges(cx),
3966                &[DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0)]
3967            );
3968
3969            view.select_display_ranges(&[DisplayPoint::new(0, 1)..DisplayPoint::new(0, 2)], cx)
3970                .unwrap();
3971            view.select_to_beginning(&SelectToBeginning, cx);
3972            assert_eq!(
3973                view.selection_ranges(cx),
3974                &[DisplayPoint::new(0, 1)..DisplayPoint::new(0, 0)]
3975            );
3976
3977            view.select_to_end(&SelectToEnd, cx);
3978            assert_eq!(
3979                view.selection_ranges(cx),
3980                &[DisplayPoint::new(0, 1)..DisplayPoint::new(5, 6)]
3981            );
3982        });
3983    }
3984
3985    #[gpui::test]
3986    fn test_move_cursor_multibyte(cx: &mut gpui::MutableAppContext) {
3987        let buffer = cx.add_model(|cx| Buffer::new(0, "ⓐⓑⓒⓓⓔ\nabcde\nαβγδε\n", cx));
3988        let settings = EditorSettings::test(&cx);
3989        let (_, view) = cx.add_window(Default::default(), |cx| {
3990            build_editor(buffer.clone(), settings, cx)
3991        });
3992
3993        assert_eq!('ⓐ'.len_utf8(), 3);
3994        assert_eq!('α'.len_utf8(), 2);
3995
3996        view.update(cx, |view, cx| {
3997            view.fold_ranges(
3998                vec![
3999                    Point::new(0, 6)..Point::new(0, 12),
4000                    Point::new(1, 2)..Point::new(1, 4),
4001                    Point::new(2, 4)..Point::new(2, 8),
4002                ],
4003                cx,
4004            );
4005            assert_eq!(view.display_text(cx), "ⓐⓑ…ⓔ\nab…e\nαβ…ε\n");
4006
4007            view.move_right(&MoveRight, cx);
4008            assert_eq!(view.selection_ranges(cx), &[empty_range(0, "ⓐ".len())]);
4009            view.move_right(&MoveRight, cx);
4010            assert_eq!(view.selection_ranges(cx), &[empty_range(0, "ⓐⓑ".len())]);
4011            view.move_right(&MoveRight, cx);
4012            assert_eq!(view.selection_ranges(cx), &[empty_range(0, "ⓐⓑ…".len())]);
4013
4014            view.move_down(&MoveDown, cx);
4015            assert_eq!(view.selection_ranges(cx), &[empty_range(1, "ab…".len())]);
4016            view.move_left(&MoveLeft, cx);
4017            assert_eq!(view.selection_ranges(cx), &[empty_range(1, "ab".len())]);
4018            view.move_left(&MoveLeft, cx);
4019            assert_eq!(view.selection_ranges(cx), &[empty_range(1, "a".len())]);
4020
4021            view.move_down(&MoveDown, cx);
4022            assert_eq!(view.selection_ranges(cx), &[empty_range(2, "α".len())]);
4023            view.move_right(&MoveRight, cx);
4024            assert_eq!(view.selection_ranges(cx), &[empty_range(2, "αβ".len())]);
4025            view.move_right(&MoveRight, cx);
4026            assert_eq!(view.selection_ranges(cx), &[empty_range(2, "αβ…".len())]);
4027            view.move_right(&MoveRight, cx);
4028            assert_eq!(view.selection_ranges(cx), &[empty_range(2, "αβ…ε".len())]);
4029
4030            view.move_up(&MoveUp, cx);
4031            assert_eq!(view.selection_ranges(cx), &[empty_range(1, "ab…e".len())]);
4032            view.move_up(&MoveUp, cx);
4033            assert_eq!(view.selection_ranges(cx), &[empty_range(0, "ⓐⓑ…ⓔ".len())]);
4034            view.move_left(&MoveLeft, cx);
4035            assert_eq!(view.selection_ranges(cx), &[empty_range(0, "ⓐⓑ…".len())]);
4036            view.move_left(&MoveLeft, cx);
4037            assert_eq!(view.selection_ranges(cx), &[empty_range(0, "ⓐⓑ".len())]);
4038            view.move_left(&MoveLeft, cx);
4039            assert_eq!(view.selection_ranges(cx), &[empty_range(0, "ⓐ".len())]);
4040        });
4041    }
4042
4043    #[gpui::test]
4044    fn test_move_cursor_different_line_lengths(cx: &mut gpui::MutableAppContext) {
4045        let buffer = cx.add_model(|cx| Buffer::new(0, "ⓐⓑⓒⓓⓔ\nabcd\nαβγ\nabcd\nⓐⓑⓒⓓⓔ\n", cx));
4046        let settings = EditorSettings::test(&cx);
4047        let (_, view) = cx.add_window(Default::default(), |cx| {
4048            build_editor(buffer.clone(), settings, cx)
4049        });
4050        view.update(cx, |view, cx| {
4051            view.select_display_ranges(&[empty_range(0, "ⓐⓑⓒⓓⓔ".len())], cx)
4052                .unwrap();
4053
4054            view.move_down(&MoveDown, cx);
4055            assert_eq!(view.selection_ranges(cx), &[empty_range(1, "abcd".len())]);
4056
4057            view.move_down(&MoveDown, cx);
4058            assert_eq!(view.selection_ranges(cx), &[empty_range(2, "αβγ".len())]);
4059
4060            view.move_down(&MoveDown, cx);
4061            assert_eq!(view.selection_ranges(cx), &[empty_range(3, "abcd".len())]);
4062
4063            view.move_down(&MoveDown, cx);
4064            assert_eq!(view.selection_ranges(cx), &[empty_range(4, "ⓐⓑⓒⓓⓔ".len())]);
4065
4066            view.move_up(&MoveUp, cx);
4067            assert_eq!(view.selection_ranges(cx), &[empty_range(3, "abcd".len())]);
4068
4069            view.move_up(&MoveUp, cx);
4070            assert_eq!(view.selection_ranges(cx), &[empty_range(2, "αβγ".len())]);
4071        });
4072    }
4073
4074    #[gpui::test]
4075    fn test_beginning_end_of_line(cx: &mut gpui::MutableAppContext) {
4076        let buffer = cx.add_model(|cx| Buffer::new(0, "abc\n  def", cx));
4077        let settings = EditorSettings::test(&cx);
4078        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
4079        view.update(cx, |view, cx| {
4080            view.select_display_ranges(
4081                &[
4082                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1),
4083                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 4),
4084                ],
4085                cx,
4086            )
4087            .unwrap();
4088        });
4089
4090        view.update(cx, |view, cx| {
4091            view.move_to_beginning_of_line(&MoveToBeginningOfLine, cx);
4092            assert_eq!(
4093                view.selection_ranges(cx),
4094                &[
4095                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0),
4096                    DisplayPoint::new(1, 2)..DisplayPoint::new(1, 2),
4097                ]
4098            );
4099        });
4100
4101        view.update(cx, |view, cx| {
4102            view.move_to_beginning_of_line(&MoveToBeginningOfLine, cx);
4103            assert_eq!(
4104                view.selection_ranges(cx),
4105                &[
4106                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0),
4107                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
4108                ]
4109            );
4110        });
4111
4112        view.update(cx, |view, cx| {
4113            view.move_to_beginning_of_line(&MoveToBeginningOfLine, cx);
4114            assert_eq!(
4115                view.selection_ranges(cx),
4116                &[
4117                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0),
4118                    DisplayPoint::new(1, 2)..DisplayPoint::new(1, 2),
4119                ]
4120            );
4121        });
4122
4123        view.update(cx, |view, cx| {
4124            view.move_to_end_of_line(&MoveToEndOfLine, cx);
4125            assert_eq!(
4126                view.selection_ranges(cx),
4127                &[
4128                    DisplayPoint::new(0, 3)..DisplayPoint::new(0, 3),
4129                    DisplayPoint::new(1, 5)..DisplayPoint::new(1, 5),
4130                ]
4131            );
4132        });
4133
4134        // Moving to the end of line again is a no-op.
4135        view.update(cx, |view, cx| {
4136            view.move_to_end_of_line(&MoveToEndOfLine, cx);
4137            assert_eq!(
4138                view.selection_ranges(cx),
4139                &[
4140                    DisplayPoint::new(0, 3)..DisplayPoint::new(0, 3),
4141                    DisplayPoint::new(1, 5)..DisplayPoint::new(1, 5),
4142                ]
4143            );
4144        });
4145
4146        view.update(cx, |view, cx| {
4147            view.move_left(&MoveLeft, cx);
4148            view.select_to_beginning_of_line(&SelectToBeginningOfLine(true), cx);
4149            assert_eq!(
4150                view.selection_ranges(cx),
4151                &[
4152                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 0),
4153                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 2),
4154                ]
4155            );
4156        });
4157
4158        view.update(cx, |view, cx| {
4159            view.select_to_beginning_of_line(&SelectToBeginningOfLine(true), cx);
4160            assert_eq!(
4161                view.selection_ranges(cx),
4162                &[
4163                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 0),
4164                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 0),
4165                ]
4166            );
4167        });
4168
4169        view.update(cx, |view, cx| {
4170            view.select_to_beginning_of_line(&SelectToBeginningOfLine(true), cx);
4171            assert_eq!(
4172                view.selection_ranges(cx),
4173                &[
4174                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 0),
4175                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 2),
4176                ]
4177            );
4178        });
4179
4180        view.update(cx, |view, cx| {
4181            view.select_to_end_of_line(&SelectToEndOfLine, cx);
4182            assert_eq!(
4183                view.selection_ranges(cx),
4184                &[
4185                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 3),
4186                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 5),
4187                ]
4188            );
4189        });
4190
4191        view.update(cx, |view, cx| {
4192            view.delete_to_end_of_line(&DeleteToEndOfLine, cx);
4193            assert_eq!(view.display_text(cx), "ab\n  de");
4194            assert_eq!(
4195                view.selection_ranges(cx),
4196                &[
4197                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
4198                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 4),
4199                ]
4200            );
4201        });
4202
4203        view.update(cx, |view, cx| {
4204            view.delete_to_beginning_of_line(&DeleteToBeginningOfLine, cx);
4205            assert_eq!(view.display_text(cx), "\n");
4206            assert_eq!(
4207                view.selection_ranges(cx),
4208                &[
4209                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0),
4210                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
4211                ]
4212            );
4213        });
4214    }
4215
4216    #[gpui::test]
4217    fn test_prev_next_word_boundary(cx: &mut gpui::MutableAppContext) {
4218        let buffer =
4219            cx.add_model(|cx| Buffer::new(0, "use std::str::{foo, bar}\n\n  {baz.qux()}", cx));
4220        let settings = EditorSettings::test(&cx);
4221        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
4222        view.update(cx, |view, cx| {
4223            view.select_display_ranges(
4224                &[
4225                    DisplayPoint::new(0, 11)..DisplayPoint::new(0, 11),
4226                    DisplayPoint::new(2, 4)..DisplayPoint::new(2, 4),
4227                ],
4228                cx,
4229            )
4230            .unwrap();
4231        });
4232
4233        view.update(cx, |view, cx| {
4234            view.move_to_previous_word_boundary(&MoveToPreviousWordBoundary, cx);
4235            assert_eq!(
4236                view.selection_ranges(cx),
4237                &[
4238                    DisplayPoint::new(0, 9)..DisplayPoint::new(0, 9),
4239                    DisplayPoint::new(2, 3)..DisplayPoint::new(2, 3),
4240                ]
4241            );
4242        });
4243
4244        view.update(cx, |view, cx| {
4245            view.move_to_previous_word_boundary(&MoveToPreviousWordBoundary, cx);
4246            assert_eq!(
4247                view.selection_ranges(cx),
4248                &[
4249                    DisplayPoint::new(0, 7)..DisplayPoint::new(0, 7),
4250                    DisplayPoint::new(2, 2)..DisplayPoint::new(2, 2),
4251                ]
4252            );
4253        });
4254
4255        view.update(cx, |view, cx| {
4256            view.move_to_previous_word_boundary(&MoveToPreviousWordBoundary, cx);
4257            assert_eq!(
4258                view.selection_ranges(cx),
4259                &[
4260                    DisplayPoint::new(0, 4)..DisplayPoint::new(0, 4),
4261                    DisplayPoint::new(2, 0)..DisplayPoint::new(2, 0),
4262                ]
4263            );
4264        });
4265
4266        view.update(cx, |view, cx| {
4267            view.move_to_previous_word_boundary(&MoveToPreviousWordBoundary, cx);
4268            assert_eq!(
4269                view.selection_ranges(cx),
4270                &[
4271                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0),
4272                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
4273                ]
4274            );
4275        });
4276
4277        view.update(cx, |view, cx| {
4278            view.move_to_previous_word_boundary(&MoveToPreviousWordBoundary, cx);
4279            assert_eq!(
4280                view.selection_ranges(cx),
4281                &[
4282                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0),
4283                    DisplayPoint::new(0, 23)..DisplayPoint::new(0, 23),
4284                ]
4285            );
4286        });
4287
4288        view.update(cx, |view, cx| {
4289            view.move_to_next_word_boundary(&MoveToNextWordBoundary, cx);
4290            assert_eq!(
4291                view.selection_ranges(cx),
4292                &[
4293                    DisplayPoint::new(0, 3)..DisplayPoint::new(0, 3),
4294                    DisplayPoint::new(0, 24)..DisplayPoint::new(0, 24),
4295                ]
4296            );
4297        });
4298
4299        view.update(cx, |view, cx| {
4300            view.move_to_next_word_boundary(&MoveToNextWordBoundary, cx);
4301            assert_eq!(
4302                view.selection_ranges(cx),
4303                &[
4304                    DisplayPoint::new(0, 7)..DisplayPoint::new(0, 7),
4305                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
4306                ]
4307            );
4308        });
4309
4310        view.update(cx, |view, cx| {
4311            view.move_to_next_word_boundary(&MoveToNextWordBoundary, cx);
4312            assert_eq!(
4313                view.selection_ranges(cx),
4314                &[
4315                    DisplayPoint::new(0, 9)..DisplayPoint::new(0, 9),
4316                    DisplayPoint::new(2, 3)..DisplayPoint::new(2, 3),
4317                ]
4318            );
4319        });
4320
4321        view.update(cx, |view, cx| {
4322            view.move_right(&MoveRight, cx);
4323            view.select_to_previous_word_boundary(&SelectToPreviousWordBoundary, cx);
4324            assert_eq!(
4325                view.selection_ranges(cx),
4326                &[
4327                    DisplayPoint::new(0, 10)..DisplayPoint::new(0, 9),
4328                    DisplayPoint::new(2, 4)..DisplayPoint::new(2, 3),
4329                ]
4330            );
4331        });
4332
4333        view.update(cx, |view, cx| {
4334            view.select_to_previous_word_boundary(&SelectToPreviousWordBoundary, cx);
4335            assert_eq!(
4336                view.selection_ranges(cx),
4337                &[
4338                    DisplayPoint::new(0, 10)..DisplayPoint::new(0, 7),
4339                    DisplayPoint::new(2, 4)..DisplayPoint::new(2, 2),
4340                ]
4341            );
4342        });
4343
4344        view.update(cx, |view, cx| {
4345            view.select_to_next_word_boundary(&SelectToNextWordBoundary, cx);
4346            assert_eq!(
4347                view.selection_ranges(cx),
4348                &[
4349                    DisplayPoint::new(0, 10)..DisplayPoint::new(0, 9),
4350                    DisplayPoint::new(2, 4)..DisplayPoint::new(2, 3),
4351                ]
4352            );
4353        });
4354    }
4355
4356    #[gpui::test]
4357    fn test_prev_next_word_bounds_with_soft_wrap(cx: &mut gpui::MutableAppContext) {
4358        let buffer =
4359            cx.add_model(|cx| Buffer::new(0, "use one::{\n    two::three::four::five\n};", cx));
4360        let settings = EditorSettings::test(&cx);
4361        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
4362
4363        view.update(cx, |view, cx| {
4364            view.set_wrap_width(Some(140.), cx);
4365            assert_eq!(
4366                view.display_text(cx),
4367                "use one::{\n    two::three::\n    four::five\n};"
4368            );
4369
4370            view.select_display_ranges(&[DisplayPoint::new(1, 7)..DisplayPoint::new(1, 7)], cx)
4371                .unwrap();
4372
4373            view.move_to_next_word_boundary(&MoveToNextWordBoundary, cx);
4374            assert_eq!(
4375                view.selection_ranges(cx),
4376                &[DisplayPoint::new(1, 9)..DisplayPoint::new(1, 9)]
4377            );
4378
4379            view.move_to_next_word_boundary(&MoveToNextWordBoundary, cx);
4380            assert_eq!(
4381                view.selection_ranges(cx),
4382                &[DisplayPoint::new(1, 14)..DisplayPoint::new(1, 14)]
4383            );
4384
4385            view.move_to_next_word_boundary(&MoveToNextWordBoundary, cx);
4386            assert_eq!(
4387                view.selection_ranges(cx),
4388                &[DisplayPoint::new(2, 4)..DisplayPoint::new(2, 4)]
4389            );
4390
4391            view.move_to_next_word_boundary(&MoveToNextWordBoundary, cx);
4392            assert_eq!(
4393                view.selection_ranges(cx),
4394                &[DisplayPoint::new(2, 8)..DisplayPoint::new(2, 8)]
4395            );
4396
4397            view.move_to_previous_word_boundary(&MoveToPreviousWordBoundary, cx);
4398            assert_eq!(
4399                view.selection_ranges(cx),
4400                &[DisplayPoint::new(2, 4)..DisplayPoint::new(2, 4)]
4401            );
4402
4403            view.move_to_previous_word_boundary(&MoveToPreviousWordBoundary, cx);
4404            assert_eq!(
4405                view.selection_ranges(cx),
4406                &[DisplayPoint::new(1, 14)..DisplayPoint::new(1, 14)]
4407            );
4408        });
4409    }
4410
4411    #[gpui::test]
4412    fn test_delete_to_word_boundary(cx: &mut gpui::MutableAppContext) {
4413        let buffer = cx.add_model(|cx| Buffer::new(0, "one two three four", cx));
4414        let settings = EditorSettings::test(&cx);
4415        let (_, view) = cx.add_window(Default::default(), |cx| {
4416            build_editor(buffer.clone(), settings, cx)
4417        });
4418
4419        view.update(cx, |view, cx| {
4420            view.select_display_ranges(
4421                &[
4422                    // an empty selection - the preceding word fragment is deleted
4423                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
4424                    // characters selected - they are deleted
4425                    DisplayPoint::new(0, 9)..DisplayPoint::new(0, 12),
4426                ],
4427                cx,
4428            )
4429            .unwrap();
4430            view.delete_to_previous_word_boundary(&DeleteToPreviousWordBoundary, cx);
4431        });
4432
4433        assert_eq!(buffer.read(cx).text(), "e two te four");
4434
4435        view.update(cx, |view, cx| {
4436            view.select_display_ranges(
4437                &[
4438                    // an empty selection - the following word fragment is deleted
4439                    DisplayPoint::new(0, 3)..DisplayPoint::new(0, 3),
4440                    // characters selected - they are deleted
4441                    DisplayPoint::new(0, 9)..DisplayPoint::new(0, 10),
4442                ],
4443                cx,
4444            )
4445            .unwrap();
4446            view.delete_to_next_word_boundary(&DeleteToNextWordBoundary, cx);
4447        });
4448
4449        assert_eq!(buffer.read(cx).text(), "e t te our");
4450    }
4451
4452    #[gpui::test]
4453    fn test_newline(cx: &mut gpui::MutableAppContext) {
4454        let buffer = cx.add_model(|cx| Buffer::new(0, "aaaa\n    bbbb\n", cx));
4455        let settings = EditorSettings::test(&cx);
4456        let (_, view) = cx.add_window(Default::default(), |cx| {
4457            build_editor(buffer.clone(), settings, cx)
4458        });
4459
4460        view.update(cx, |view, cx| {
4461            view.select_display_ranges(
4462                &[
4463                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
4464                    DisplayPoint::new(1, 2)..DisplayPoint::new(1, 2),
4465                    DisplayPoint::new(1, 6)..DisplayPoint::new(1, 6),
4466                ],
4467                cx,
4468            )
4469            .unwrap();
4470
4471            view.newline(&Newline, cx);
4472            assert_eq!(view.text(cx), "aa\naa\n  \n    bb\n    bb\n");
4473        });
4474    }
4475
4476    #[gpui::test]
4477    fn test_indent_outdent(cx: &mut gpui::MutableAppContext) {
4478        let buffer = cx.add_model(|cx| Buffer::new(0, "  one two\nthree\n four", cx));
4479        let settings = EditorSettings::test(&cx);
4480        let (_, view) = cx.add_window(Default::default(), |cx| {
4481            build_editor(buffer.clone(), settings, cx)
4482        });
4483
4484        view.update(cx, |view, cx| {
4485            // two selections on the same line
4486            view.select_display_ranges(
4487                &[
4488                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 5),
4489                    DisplayPoint::new(0, 6)..DisplayPoint::new(0, 9),
4490                ],
4491                cx,
4492            )
4493            .unwrap();
4494
4495            // indent from mid-tabstop to full tabstop
4496            view.tab(&Tab, cx);
4497            assert_eq!(view.text(cx), "    one two\nthree\n four");
4498            assert_eq!(
4499                view.selection_ranges(cx),
4500                &[
4501                    DisplayPoint::new(0, 4)..DisplayPoint::new(0, 7),
4502                    DisplayPoint::new(0, 8)..DisplayPoint::new(0, 11),
4503                ]
4504            );
4505
4506            // outdent from 1 tabstop to 0 tabstops
4507            view.outdent(&Outdent, cx);
4508            assert_eq!(view.text(cx), "one two\nthree\n four");
4509            assert_eq!(
4510                view.selection_ranges(cx),
4511                &[
4512                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 3),
4513                    DisplayPoint::new(0, 4)..DisplayPoint::new(0, 7),
4514                ]
4515            );
4516
4517            // select across line ending
4518            view.select_display_ranges(&[DisplayPoint::new(1, 1)..DisplayPoint::new(2, 0)], cx)
4519                .unwrap();
4520
4521            // indent and outdent affect only the preceding line
4522            view.tab(&Tab, cx);
4523            assert_eq!(view.text(cx), "one two\n    three\n four");
4524            assert_eq!(
4525                view.selection_ranges(cx),
4526                &[DisplayPoint::new(1, 5)..DisplayPoint::new(2, 0)]
4527            );
4528            view.outdent(&Outdent, cx);
4529            assert_eq!(view.text(cx), "one two\nthree\n four");
4530            assert_eq!(
4531                view.selection_ranges(cx),
4532                &[DisplayPoint::new(1, 1)..DisplayPoint::new(2, 0)]
4533            );
4534        });
4535    }
4536
4537    #[gpui::test]
4538    fn test_backspace(cx: &mut gpui::MutableAppContext) {
4539        let buffer = cx.add_model(|cx| {
4540            Buffer::new(
4541                0,
4542                "one two three\nfour five six\nseven eight nine\nten\n",
4543                cx,
4544            )
4545        });
4546        let settings = EditorSettings::test(&cx);
4547        let (_, view) = cx.add_window(Default::default(), |cx| {
4548            build_editor(buffer.clone(), settings, cx)
4549        });
4550
4551        view.update(cx, |view, cx| {
4552            view.select_display_ranges(
4553                &[
4554                    // an empty selection - the preceding character is deleted
4555                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
4556                    // one character selected - it is deleted
4557                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 3),
4558                    // a line suffix selected - it is deleted
4559                    DisplayPoint::new(2, 6)..DisplayPoint::new(3, 0),
4560                ],
4561                cx,
4562            )
4563            .unwrap();
4564            view.backspace(&Backspace, cx);
4565        });
4566
4567        assert_eq!(
4568            buffer.read(cx).text(),
4569            "oe two three\nfou five six\nseven ten\n"
4570        );
4571    }
4572
4573    #[gpui::test]
4574    fn test_delete(cx: &mut gpui::MutableAppContext) {
4575        let buffer = cx.add_model(|cx| {
4576            Buffer::new(
4577                0,
4578                "one two three\nfour five six\nseven eight nine\nten\n",
4579                cx,
4580            )
4581        });
4582        let settings = EditorSettings::test(&cx);
4583        let (_, view) = cx.add_window(Default::default(), |cx| {
4584            build_editor(buffer.clone(), settings, cx)
4585        });
4586
4587        view.update(cx, |view, cx| {
4588            view.select_display_ranges(
4589                &[
4590                    // an empty selection - the following character is deleted
4591                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
4592                    // one character selected - it is deleted
4593                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 3),
4594                    // a line suffix selected - it is deleted
4595                    DisplayPoint::new(2, 6)..DisplayPoint::new(3, 0),
4596                ],
4597                cx,
4598            )
4599            .unwrap();
4600            view.delete(&Delete, cx);
4601        });
4602
4603        assert_eq!(
4604            buffer.read(cx).text(),
4605            "on two three\nfou five six\nseven ten\n"
4606        );
4607    }
4608
4609    #[gpui::test]
4610    fn test_delete_line(cx: &mut gpui::MutableAppContext) {
4611        let settings = EditorSettings::test(&cx);
4612        let buffer = cx.add_model(|cx| Buffer::new(0, "abc\ndef\nghi\n", cx));
4613        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
4614        view.update(cx, |view, cx| {
4615            view.select_display_ranges(
4616                &[
4617                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1),
4618                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 1),
4619                    DisplayPoint::new(3, 0)..DisplayPoint::new(3, 0),
4620                ],
4621                cx,
4622            )
4623            .unwrap();
4624            view.delete_line(&DeleteLine, cx);
4625            assert_eq!(view.display_text(cx), "ghi");
4626            assert_eq!(
4627                view.selection_ranges(cx),
4628                vec![
4629                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0),
4630                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1)
4631                ]
4632            );
4633        });
4634
4635        let settings = EditorSettings::test(&cx);
4636        let buffer = cx.add_model(|cx| Buffer::new(0, "abc\ndef\nghi\n", cx));
4637        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
4638        view.update(cx, |view, cx| {
4639            view.select_display_ranges(&[DisplayPoint::new(2, 0)..DisplayPoint::new(0, 1)], cx)
4640                .unwrap();
4641            view.delete_line(&DeleteLine, cx);
4642            assert_eq!(view.display_text(cx), "ghi\n");
4643            assert_eq!(
4644                view.selection_ranges(cx),
4645                vec![DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1)]
4646            );
4647        });
4648    }
4649
4650    #[gpui::test]
4651    fn test_duplicate_line(cx: &mut gpui::MutableAppContext) {
4652        let settings = EditorSettings::test(&cx);
4653        let buffer = cx.add_model(|cx| Buffer::new(0, "abc\ndef\nghi\n", cx));
4654        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
4655        view.update(cx, |view, cx| {
4656            view.select_display_ranges(
4657                &[
4658                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 1),
4659                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
4660                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
4661                    DisplayPoint::new(3, 0)..DisplayPoint::new(3, 0),
4662                ],
4663                cx,
4664            )
4665            .unwrap();
4666            view.duplicate_line(&DuplicateLine, cx);
4667            assert_eq!(view.display_text(cx), "abc\nabc\ndef\ndef\nghi\n\n");
4668            assert_eq!(
4669                view.selection_ranges(cx),
4670                vec![
4671                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 1),
4672                    DisplayPoint::new(1, 2)..DisplayPoint::new(1, 2),
4673                    DisplayPoint::new(3, 0)..DisplayPoint::new(3, 0),
4674                    DisplayPoint::new(6, 0)..DisplayPoint::new(6, 0),
4675                ]
4676            );
4677        });
4678
4679        let settings = EditorSettings::test(&cx);
4680        let buffer = cx.add_model(|cx| Buffer::new(0, "abc\ndef\nghi\n", cx));
4681        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
4682        view.update(cx, |view, cx| {
4683            view.select_display_ranges(
4684                &[
4685                    DisplayPoint::new(0, 1)..DisplayPoint::new(1, 1),
4686                    DisplayPoint::new(1, 2)..DisplayPoint::new(2, 1),
4687                ],
4688                cx,
4689            )
4690            .unwrap();
4691            view.duplicate_line(&DuplicateLine, cx);
4692            assert_eq!(view.display_text(cx), "abc\ndef\nghi\nabc\ndef\nghi\n");
4693            assert_eq!(
4694                view.selection_ranges(cx),
4695                vec![
4696                    DisplayPoint::new(3, 1)..DisplayPoint::new(4, 1),
4697                    DisplayPoint::new(4, 2)..DisplayPoint::new(5, 1),
4698                ]
4699            );
4700        });
4701    }
4702
4703    #[gpui::test]
4704    fn test_move_line_up_down(cx: &mut gpui::MutableAppContext) {
4705        let settings = EditorSettings::test(&cx);
4706        let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(10, 5), cx));
4707        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
4708        view.update(cx, |view, cx| {
4709            view.fold_ranges(
4710                vec![
4711                    Point::new(0, 2)..Point::new(1, 2),
4712                    Point::new(2, 3)..Point::new(4, 1),
4713                    Point::new(7, 0)..Point::new(8, 4),
4714                ],
4715                cx,
4716            );
4717            view.select_display_ranges(
4718                &[
4719                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1),
4720                    DisplayPoint::new(3, 1)..DisplayPoint::new(3, 1),
4721                    DisplayPoint::new(3, 2)..DisplayPoint::new(4, 3),
4722                    DisplayPoint::new(5, 0)..DisplayPoint::new(5, 2),
4723                ],
4724                cx,
4725            )
4726            .unwrap();
4727            assert_eq!(
4728                view.display_text(cx),
4729                "aa…bbb\nccc…eeee\nfffff\nggggg\n…i\njjjjj"
4730            );
4731
4732            view.move_line_up(&MoveLineUp, cx);
4733            assert_eq!(
4734                view.display_text(cx),
4735                "aa…bbb\nccc…eeee\nggggg\n…i\njjjjj\nfffff"
4736            );
4737            assert_eq!(
4738                view.selection_ranges(cx),
4739                vec![
4740                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1),
4741                    DisplayPoint::new(2, 1)..DisplayPoint::new(2, 1),
4742                    DisplayPoint::new(2, 2)..DisplayPoint::new(3, 3),
4743                    DisplayPoint::new(4, 0)..DisplayPoint::new(4, 2)
4744                ]
4745            );
4746        });
4747
4748        view.update(cx, |view, cx| {
4749            view.move_line_down(&MoveLineDown, cx);
4750            assert_eq!(
4751                view.display_text(cx),
4752                "ccc…eeee\naa…bbb\nfffff\nggggg\n…i\njjjjj"
4753            );
4754            assert_eq!(
4755                view.selection_ranges(cx),
4756                vec![
4757                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 1),
4758                    DisplayPoint::new(3, 1)..DisplayPoint::new(3, 1),
4759                    DisplayPoint::new(3, 2)..DisplayPoint::new(4, 3),
4760                    DisplayPoint::new(5, 0)..DisplayPoint::new(5, 2)
4761                ]
4762            );
4763        });
4764
4765        view.update(cx, |view, cx| {
4766            view.move_line_down(&MoveLineDown, cx);
4767            assert_eq!(
4768                view.display_text(cx),
4769                "ccc…eeee\nfffff\naa…bbb\nggggg\n…i\njjjjj"
4770            );
4771            assert_eq!(
4772                view.selection_ranges(cx),
4773                vec![
4774                    DisplayPoint::new(2, 1)..DisplayPoint::new(2, 1),
4775                    DisplayPoint::new(3, 1)..DisplayPoint::new(3, 1),
4776                    DisplayPoint::new(3, 2)..DisplayPoint::new(4, 3),
4777                    DisplayPoint::new(5, 0)..DisplayPoint::new(5, 2)
4778                ]
4779            );
4780        });
4781
4782        view.update(cx, |view, cx| {
4783            view.move_line_up(&MoveLineUp, cx);
4784            assert_eq!(
4785                view.display_text(cx),
4786                "ccc…eeee\naa…bbb\nggggg\n…i\njjjjj\nfffff"
4787            );
4788            assert_eq!(
4789                view.selection_ranges(cx),
4790                vec![
4791                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 1),
4792                    DisplayPoint::new(2, 1)..DisplayPoint::new(2, 1),
4793                    DisplayPoint::new(2, 2)..DisplayPoint::new(3, 3),
4794                    DisplayPoint::new(4, 0)..DisplayPoint::new(4, 2)
4795                ]
4796            );
4797        });
4798    }
4799
4800    #[gpui::test]
4801    fn test_clipboard(cx: &mut gpui::MutableAppContext) {
4802        let buffer = cx.add_model(|cx| Buffer::new(0, "one✅ two three four five six ", cx));
4803        let settings = EditorSettings::test(&cx);
4804        let view = cx
4805            .add_window(Default::default(), |cx| {
4806                build_editor(buffer.clone(), settings, cx)
4807            })
4808            .1;
4809
4810        // Cut with three selections. Clipboard text is divided into three slices.
4811        view.update(cx, |view, cx| {
4812            view.select_ranges(vec![0..7, 11..17, 22..27], None, cx);
4813            view.cut(&Cut, cx);
4814            assert_eq!(view.display_text(cx), "two four six ");
4815        });
4816
4817        // Paste with three cursors. Each cursor pastes one slice of the clipboard text.
4818        view.update(cx, |view, cx| {
4819            view.select_ranges(vec![4..4, 9..9, 13..13], None, cx);
4820            view.paste(&Paste, cx);
4821            assert_eq!(view.display_text(cx), "two one✅ four three six five ");
4822            assert_eq!(
4823                view.selection_ranges(cx),
4824                &[
4825                    DisplayPoint::new(0, 11)..DisplayPoint::new(0, 11),
4826                    DisplayPoint::new(0, 22)..DisplayPoint::new(0, 22),
4827                    DisplayPoint::new(0, 31)..DisplayPoint::new(0, 31)
4828                ]
4829            );
4830        });
4831
4832        // Paste again but with only two cursors. Since the number of cursors doesn't
4833        // match the number of slices in the clipboard, the entire clipboard text
4834        // is pasted at each cursor.
4835        view.update(cx, |view, cx| {
4836            view.select_ranges(vec![0..0, 31..31], None, cx);
4837            view.handle_input(&Input("( ".into()), cx);
4838            view.paste(&Paste, cx);
4839            view.handle_input(&Input(") ".into()), cx);
4840            assert_eq!(
4841                view.display_text(cx),
4842                "( one✅ three five ) two one✅ four three six five ( one✅ three five ) "
4843            );
4844        });
4845
4846        view.update(cx, |view, cx| {
4847            view.select_ranges(vec![0..0], None, cx);
4848            view.handle_input(&Input("123\n4567\n89\n".into()), cx);
4849            assert_eq!(
4850                view.display_text(cx),
4851                "123\n4567\n89\n( one✅ three five ) two one✅ four three six five ( one✅ three five ) "
4852            );
4853        });
4854
4855        // Cut with three selections, one of which is full-line.
4856        view.update(cx, |view, cx| {
4857            view.select_display_ranges(
4858                &[
4859                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 2),
4860                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 1),
4861                    DisplayPoint::new(2, 0)..DisplayPoint::new(2, 1),
4862                ],
4863                cx,
4864            )
4865            .unwrap();
4866            view.cut(&Cut, cx);
4867            assert_eq!(
4868                view.display_text(cx),
4869                "13\n9\n( one✅ three five ) two one✅ four three six five ( one✅ three five ) "
4870            );
4871        });
4872
4873        // Paste with three selections, noticing how the copied selection that was full-line
4874        // gets inserted before the second cursor.
4875        view.update(cx, |view, cx| {
4876            view.select_display_ranges(
4877                &[
4878                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1),
4879                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 1),
4880                    DisplayPoint::new(2, 2)..DisplayPoint::new(2, 3),
4881                ],
4882                cx,
4883            )
4884            .unwrap();
4885            view.paste(&Paste, cx);
4886            assert_eq!(
4887                view.display_text(cx),
4888                "123\n4567\n9\n( 8ne✅ three five ) two one✅ four three six five ( one✅ three five ) "
4889            );
4890            assert_eq!(
4891                view.selection_ranges(cx),
4892                &[
4893                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
4894                    DisplayPoint::new(2, 1)..DisplayPoint::new(2, 1),
4895                    DisplayPoint::new(3, 3)..DisplayPoint::new(3, 3),
4896                ]
4897            );
4898        });
4899
4900        // Copy with a single cursor only, which writes the whole line into the clipboard.
4901        view.update(cx, |view, cx| {
4902            view.select_display_ranges(&[DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1)], cx)
4903                .unwrap();
4904            view.copy(&Copy, cx);
4905        });
4906
4907        // Paste with three selections, noticing how the copied full-line selection is inserted
4908        // before the empty selections but replaces the selection that is non-empty.
4909        view.update(cx, |view, cx| {
4910            view.select_display_ranges(
4911                &[
4912                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1),
4913                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 2),
4914                    DisplayPoint::new(2, 1)..DisplayPoint::new(2, 1),
4915                ],
4916                cx,
4917            )
4918            .unwrap();
4919            view.paste(&Paste, cx);
4920            assert_eq!(
4921                view.display_text(cx),
4922                "123\n123\n123\n67\n123\n9\n( 8ne✅ three five ) two one✅ four three six five ( one✅ three five ) "
4923            );
4924            assert_eq!(
4925                view.selection_ranges(cx),
4926                &[
4927                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 1),
4928                    DisplayPoint::new(3, 0)..DisplayPoint::new(3, 0),
4929                    DisplayPoint::new(5, 1)..DisplayPoint::new(5, 1),
4930                ]
4931            );
4932        });
4933    }
4934
4935    #[gpui::test]
4936    fn test_select_all(cx: &mut gpui::MutableAppContext) {
4937        let buffer = cx.add_model(|cx| Buffer::new(0, "abc\nde\nfgh", cx));
4938        let settings = EditorSettings::test(&cx);
4939        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
4940        view.update(cx, |view, cx| {
4941            view.select_all(&SelectAll, cx);
4942            assert_eq!(
4943                view.selection_ranges(cx),
4944                &[DisplayPoint::new(0, 0)..DisplayPoint::new(2, 3)]
4945            );
4946        });
4947    }
4948
4949    #[gpui::test]
4950    fn test_select_line(cx: &mut gpui::MutableAppContext) {
4951        let settings = EditorSettings::test(&cx);
4952        let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(6, 5), cx));
4953        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
4954        view.update(cx, |view, cx| {
4955            view.select_display_ranges(
4956                &[
4957                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 1),
4958                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
4959                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
4960                    DisplayPoint::new(4, 2)..DisplayPoint::new(4, 2),
4961                ],
4962                cx,
4963            )
4964            .unwrap();
4965            view.select_line(&SelectLine, cx);
4966            assert_eq!(
4967                view.selection_ranges(cx),
4968                vec![
4969                    DisplayPoint::new(0, 0)..DisplayPoint::new(2, 0),
4970                    DisplayPoint::new(4, 0)..DisplayPoint::new(5, 0),
4971                ]
4972            );
4973        });
4974
4975        view.update(cx, |view, cx| {
4976            view.select_line(&SelectLine, cx);
4977            assert_eq!(
4978                view.selection_ranges(cx),
4979                vec![
4980                    DisplayPoint::new(0, 0)..DisplayPoint::new(3, 0),
4981                    DisplayPoint::new(4, 0)..DisplayPoint::new(5, 5),
4982                ]
4983            );
4984        });
4985
4986        view.update(cx, |view, cx| {
4987            view.select_line(&SelectLine, cx);
4988            assert_eq!(
4989                view.selection_ranges(cx),
4990                vec![DisplayPoint::new(0, 0)..DisplayPoint::new(5, 5)]
4991            );
4992        });
4993    }
4994
4995    #[gpui::test]
4996    fn test_split_selection_into_lines(cx: &mut gpui::MutableAppContext) {
4997        let settings = EditorSettings::test(&cx);
4998        let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(9, 5), cx));
4999        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
5000        view.update(cx, |view, cx| {
5001            view.fold_ranges(
5002                vec![
5003                    Point::new(0, 2)..Point::new(1, 2),
5004                    Point::new(2, 3)..Point::new(4, 1),
5005                    Point::new(7, 0)..Point::new(8, 4),
5006                ],
5007                cx,
5008            );
5009            view.select_display_ranges(
5010                &[
5011                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 1),
5012                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
5013                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
5014                    DisplayPoint::new(4, 4)..DisplayPoint::new(4, 4),
5015                ],
5016                cx,
5017            )
5018            .unwrap();
5019            assert_eq!(view.display_text(cx), "aa…bbb\nccc…eeee\nfffff\nggggg\n…i");
5020        });
5021
5022        view.update(cx, |view, cx| {
5023            view.split_selection_into_lines(&SplitSelectionIntoLines, cx);
5024            assert_eq!(
5025                view.display_text(cx),
5026                "aaaaa\nbbbbb\nccc…eeee\nfffff\nggggg\n…i"
5027            );
5028            assert_eq!(
5029                view.selection_ranges(cx),
5030                [
5031                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 1),
5032                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 2),
5033                    DisplayPoint::new(2, 0)..DisplayPoint::new(2, 0),
5034                    DisplayPoint::new(5, 4)..DisplayPoint::new(5, 4)
5035                ]
5036            );
5037        });
5038
5039        view.update(cx, |view, cx| {
5040            view.select_display_ranges(&[DisplayPoint::new(5, 0)..DisplayPoint::new(0, 1)], cx)
5041                .unwrap();
5042            view.split_selection_into_lines(&SplitSelectionIntoLines, cx);
5043            assert_eq!(
5044                view.display_text(cx),
5045                "aaaaa\nbbbbb\nccccc\nddddd\neeeee\nfffff\nggggg\nhhhhh\niiiii"
5046            );
5047            assert_eq!(
5048                view.selection_ranges(cx),
5049                [
5050                    DisplayPoint::new(0, 5)..DisplayPoint::new(0, 5),
5051                    DisplayPoint::new(1, 5)..DisplayPoint::new(1, 5),
5052                    DisplayPoint::new(2, 5)..DisplayPoint::new(2, 5),
5053                    DisplayPoint::new(3, 5)..DisplayPoint::new(3, 5),
5054                    DisplayPoint::new(4, 5)..DisplayPoint::new(4, 5),
5055                    DisplayPoint::new(5, 5)..DisplayPoint::new(5, 5),
5056                    DisplayPoint::new(6, 5)..DisplayPoint::new(6, 5),
5057                    DisplayPoint::new(7, 0)..DisplayPoint::new(7, 0)
5058                ]
5059            );
5060        });
5061    }
5062
5063    #[gpui::test]
5064    fn test_add_selection_above_below(cx: &mut gpui::MutableAppContext) {
5065        let settings = EditorSettings::test(&cx);
5066        let buffer = cx.add_model(|cx| Buffer::new(0, "abc\ndefghi\n\njk\nlmno\n", cx));
5067        let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, settings, cx));
5068
5069        view.update(cx, |view, cx| {
5070            view.select_display_ranges(&[DisplayPoint::new(1, 3)..DisplayPoint::new(1, 3)], cx)
5071                .unwrap();
5072        });
5073        view.update(cx, |view, cx| {
5074            view.add_selection_above(&AddSelectionAbove, cx);
5075            assert_eq!(
5076                view.selection_ranges(cx),
5077                vec![
5078                    DisplayPoint::new(0, 3)..DisplayPoint::new(0, 3),
5079                    DisplayPoint::new(1, 3)..DisplayPoint::new(1, 3)
5080                ]
5081            );
5082        });
5083
5084        view.update(cx, |view, cx| {
5085            view.add_selection_above(&AddSelectionAbove, cx);
5086            assert_eq!(
5087                view.selection_ranges(cx),
5088                vec![
5089                    DisplayPoint::new(0, 3)..DisplayPoint::new(0, 3),
5090                    DisplayPoint::new(1, 3)..DisplayPoint::new(1, 3)
5091                ]
5092            );
5093        });
5094
5095        view.update(cx, |view, cx| {
5096            view.add_selection_below(&AddSelectionBelow, cx);
5097            assert_eq!(
5098                view.selection_ranges(cx),
5099                vec![DisplayPoint::new(1, 3)..DisplayPoint::new(1, 3)]
5100            );
5101        });
5102
5103        view.update(cx, |view, cx| {
5104            view.add_selection_below(&AddSelectionBelow, cx);
5105            assert_eq!(
5106                view.selection_ranges(cx),
5107                vec![
5108                    DisplayPoint::new(1, 3)..DisplayPoint::new(1, 3),
5109                    DisplayPoint::new(4, 3)..DisplayPoint::new(4, 3)
5110                ]
5111            );
5112        });
5113
5114        view.update(cx, |view, cx| {
5115            view.add_selection_below(&AddSelectionBelow, cx);
5116            assert_eq!(
5117                view.selection_ranges(cx),
5118                vec![
5119                    DisplayPoint::new(1, 3)..DisplayPoint::new(1, 3),
5120                    DisplayPoint::new(4, 3)..DisplayPoint::new(4, 3)
5121                ]
5122            );
5123        });
5124
5125        view.update(cx, |view, cx| {
5126            view.select_display_ranges(&[DisplayPoint::new(1, 4)..DisplayPoint::new(1, 3)], cx)
5127                .unwrap();
5128        });
5129        view.update(cx, |view, cx| {
5130            view.add_selection_below(&AddSelectionBelow, cx);
5131            assert_eq!(
5132                view.selection_ranges(cx),
5133                vec![
5134                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 3),
5135                    DisplayPoint::new(4, 4)..DisplayPoint::new(4, 3)
5136                ]
5137            );
5138        });
5139
5140        view.update(cx, |view, cx| {
5141            view.add_selection_below(&AddSelectionBelow, cx);
5142            assert_eq!(
5143                view.selection_ranges(cx),
5144                vec![
5145                    DisplayPoint::new(1, 4)..DisplayPoint::new(1, 3),
5146                    DisplayPoint::new(4, 4)..DisplayPoint::new(4, 3)
5147                ]
5148            );
5149        });
5150
5151        view.update(cx, |view, cx| {
5152            view.add_selection_above(&AddSelectionAbove, cx);
5153            assert_eq!(
5154                view.selection_ranges(cx),
5155                vec![DisplayPoint::new(1, 4)..DisplayPoint::new(1, 3)]
5156            );
5157        });
5158
5159        view.update(cx, |view, cx| {
5160            view.add_selection_above(&AddSelectionAbove, cx);
5161            assert_eq!(
5162                view.selection_ranges(cx),
5163                vec![DisplayPoint::new(1, 4)..DisplayPoint::new(1, 3)]
5164            );
5165        });
5166
5167        view.update(cx, |view, cx| {
5168            view.select_display_ranges(&[DisplayPoint::new(0, 1)..DisplayPoint::new(1, 4)], cx)
5169                .unwrap();
5170            view.add_selection_below(&AddSelectionBelow, cx);
5171            assert_eq!(
5172                view.selection_ranges(cx),
5173                vec![
5174                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 3),
5175                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 4),
5176                    DisplayPoint::new(3, 1)..DisplayPoint::new(3, 2),
5177                ]
5178            );
5179        });
5180
5181        view.update(cx, |view, cx| {
5182            view.add_selection_below(&AddSelectionBelow, cx);
5183            assert_eq!(
5184                view.selection_ranges(cx),
5185                vec![
5186                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 3),
5187                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 4),
5188                    DisplayPoint::new(3, 1)..DisplayPoint::new(3, 2),
5189                    DisplayPoint::new(4, 1)..DisplayPoint::new(4, 4),
5190                ]
5191            );
5192        });
5193
5194        view.update(cx, |view, cx| {
5195            view.add_selection_above(&AddSelectionAbove, cx);
5196            assert_eq!(
5197                view.selection_ranges(cx),
5198                vec![
5199                    DisplayPoint::new(0, 1)..DisplayPoint::new(0, 3),
5200                    DisplayPoint::new(1, 1)..DisplayPoint::new(1, 4),
5201                    DisplayPoint::new(3, 1)..DisplayPoint::new(3, 2),
5202                ]
5203            );
5204        });
5205
5206        view.update(cx, |view, cx| {
5207            view.select_display_ranges(&[DisplayPoint::new(4, 3)..DisplayPoint::new(1, 1)], cx)
5208                .unwrap();
5209        });
5210        view.update(cx, |view, cx| {
5211            view.add_selection_above(&AddSelectionAbove, cx);
5212            assert_eq!(
5213                view.selection_ranges(cx),
5214                vec![
5215                    DisplayPoint::new(0, 3)..DisplayPoint::new(0, 1),
5216                    DisplayPoint::new(1, 3)..DisplayPoint::new(1, 1),
5217                    DisplayPoint::new(3, 2)..DisplayPoint::new(3, 1),
5218                    DisplayPoint::new(4, 3)..DisplayPoint::new(4, 1),
5219                ]
5220            );
5221        });
5222
5223        view.update(cx, |view, cx| {
5224            view.add_selection_below(&AddSelectionBelow, cx);
5225            assert_eq!(
5226                view.selection_ranges(cx),
5227                vec![
5228                    DisplayPoint::new(1, 3)..DisplayPoint::new(1, 1),
5229                    DisplayPoint::new(3, 2)..DisplayPoint::new(3, 1),
5230                    DisplayPoint::new(4, 3)..DisplayPoint::new(4, 1),
5231                ]
5232            );
5233        });
5234    }
5235
5236    #[gpui::test]
5237    async fn test_select_larger_smaller_syntax_node(mut cx: gpui::TestAppContext) {
5238        let settings = cx.read(EditorSettings::test);
5239        let language = Some(Arc::new(Language::new(
5240            LanguageConfig::default(),
5241            Some(tree_sitter_rust::language()),
5242        )));
5243
5244        let text = r#"
5245            use mod1::mod2::{mod3, mod4};
5246
5247            fn fn_1(param1: bool, param2: &str) {
5248                let var1 = "text";
5249            }
5250        "#
5251        .unindent();
5252
5253        let buffer = cx.add_model(|cx| Buffer::new(0, text, cx).with_language(language, None, cx));
5254        let (_, view) = cx.add_window(|cx| build_editor(buffer, settings, cx));
5255        view.condition(&cx, |view, cx| !view.buffer.read(cx).is_parsing())
5256            .await;
5257
5258        view.update(&mut cx, |view, cx| {
5259            view.select_display_ranges(
5260                &[
5261                    DisplayPoint::new(0, 25)..DisplayPoint::new(0, 25),
5262                    DisplayPoint::new(2, 24)..DisplayPoint::new(2, 12),
5263                    DisplayPoint::new(3, 18)..DisplayPoint::new(3, 18),
5264                ],
5265                cx,
5266            )
5267            .unwrap();
5268            view.select_larger_syntax_node(&SelectLargerSyntaxNode, cx);
5269        });
5270        assert_eq!(
5271            view.update(&mut cx, |view, cx| view.selection_ranges(cx)),
5272            &[
5273                DisplayPoint::new(0, 23)..DisplayPoint::new(0, 27),
5274                DisplayPoint::new(2, 35)..DisplayPoint::new(2, 7),
5275                DisplayPoint::new(3, 15)..DisplayPoint::new(3, 21),
5276            ]
5277        );
5278
5279        view.update(&mut cx, |view, cx| {
5280            view.select_larger_syntax_node(&SelectLargerSyntaxNode, cx);
5281        });
5282        assert_eq!(
5283            view.update(&mut cx, |view, cx| view.selection_ranges(cx)),
5284            &[
5285                DisplayPoint::new(0, 16)..DisplayPoint::new(0, 28),
5286                DisplayPoint::new(4, 1)..DisplayPoint::new(2, 0),
5287            ]
5288        );
5289
5290        view.update(&mut cx, |view, cx| {
5291            view.select_larger_syntax_node(&SelectLargerSyntaxNode, cx);
5292        });
5293        assert_eq!(
5294            view.update(&mut cx, |view, cx| view.selection_ranges(cx)),
5295            &[DisplayPoint::new(5, 0)..DisplayPoint::new(0, 0)]
5296        );
5297
5298        // Trying to expand the selected syntax node one more time has no effect.
5299        view.update(&mut cx, |view, cx| {
5300            view.select_larger_syntax_node(&SelectLargerSyntaxNode, cx);
5301        });
5302        assert_eq!(
5303            view.update(&mut cx, |view, cx| view.selection_ranges(cx)),
5304            &[DisplayPoint::new(5, 0)..DisplayPoint::new(0, 0)]
5305        );
5306
5307        view.update(&mut cx, |view, cx| {
5308            view.select_smaller_syntax_node(&SelectSmallerSyntaxNode, cx);
5309        });
5310        assert_eq!(
5311            view.update(&mut cx, |view, cx| view.selection_ranges(cx)),
5312            &[
5313                DisplayPoint::new(0, 16)..DisplayPoint::new(0, 28),
5314                DisplayPoint::new(4, 1)..DisplayPoint::new(2, 0),
5315            ]
5316        );
5317
5318        view.update(&mut cx, |view, cx| {
5319            view.select_smaller_syntax_node(&SelectSmallerSyntaxNode, cx);
5320        });
5321        assert_eq!(
5322            view.update(&mut cx, |view, cx| view.selection_ranges(cx)),
5323            &[
5324                DisplayPoint::new(0, 23)..DisplayPoint::new(0, 27),
5325                DisplayPoint::new(2, 35)..DisplayPoint::new(2, 7),
5326                DisplayPoint::new(3, 15)..DisplayPoint::new(3, 21),
5327            ]
5328        );
5329
5330        view.update(&mut cx, |view, cx| {
5331            view.select_smaller_syntax_node(&SelectSmallerSyntaxNode, cx);
5332        });
5333        assert_eq!(
5334            view.update(&mut cx, |view, cx| view.selection_ranges(cx)),
5335            &[
5336                DisplayPoint::new(0, 25)..DisplayPoint::new(0, 25),
5337                DisplayPoint::new(2, 24)..DisplayPoint::new(2, 12),
5338                DisplayPoint::new(3, 18)..DisplayPoint::new(3, 18),
5339            ]
5340        );
5341
5342        // Trying to shrink the selected syntax node one more time has no effect.
5343        view.update(&mut cx, |view, cx| {
5344            view.select_smaller_syntax_node(&SelectSmallerSyntaxNode, cx);
5345        });
5346        assert_eq!(
5347            view.update(&mut cx, |view, cx| view.selection_ranges(cx)),
5348            &[
5349                DisplayPoint::new(0, 25)..DisplayPoint::new(0, 25),
5350                DisplayPoint::new(2, 24)..DisplayPoint::new(2, 12),
5351                DisplayPoint::new(3, 18)..DisplayPoint::new(3, 18),
5352            ]
5353        );
5354
5355        // Ensure that we keep expanding the selection if the larger selection starts or ends within
5356        // a fold.
5357        view.update(&mut cx, |view, cx| {
5358            view.fold_ranges(
5359                vec![
5360                    Point::new(0, 21)..Point::new(0, 24),
5361                    Point::new(3, 20)..Point::new(3, 22),
5362                ],
5363                cx,
5364            );
5365            view.select_larger_syntax_node(&SelectLargerSyntaxNode, cx);
5366        });
5367        assert_eq!(
5368            view.update(&mut cx, |view, cx| view.selection_ranges(cx)),
5369            &[
5370                DisplayPoint::new(0, 16)..DisplayPoint::new(0, 28),
5371                DisplayPoint::new(2, 35)..DisplayPoint::new(2, 7),
5372                DisplayPoint::new(3, 4)..DisplayPoint::new(3, 23),
5373            ]
5374        );
5375    }
5376
5377    #[gpui::test]
5378    async fn test_autoclose_pairs(mut cx: gpui::TestAppContext) {
5379        let settings = cx.read(EditorSettings::test);
5380        let language = Some(Arc::new(Language::new(
5381            LanguageConfig {
5382                brackets: vec![
5383                    BracketPair {
5384                        start: "{".to_string(),
5385                        end: "}".to_string(),
5386                        close: true,
5387                        newline: true,
5388                    },
5389                    BracketPair {
5390                        start: "/*".to_string(),
5391                        end: " */".to_string(),
5392                        close: true,
5393                        newline: true,
5394                    },
5395                ],
5396                ..Default::default()
5397            },
5398            Some(tree_sitter_rust::language()),
5399        )));
5400
5401        let text = r#"
5402            a
5403
5404            /
5405
5406        "#
5407        .unindent();
5408
5409        let buffer = cx.add_model(|cx| Buffer::new(0, text, cx).with_language(language, None, cx));
5410        let (_, view) = cx.add_window(|cx| build_editor(buffer, settings, cx));
5411        view.condition(&cx, |view, cx| !view.buffer.read(cx).is_parsing())
5412            .await;
5413
5414        view.update(&mut cx, |view, cx| {
5415            view.select_display_ranges(
5416                &[
5417                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 1),
5418                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
5419                ],
5420                cx,
5421            )
5422            .unwrap();
5423            view.handle_input(&Input("{".to_string()), cx);
5424            view.handle_input(&Input("{".to_string()), cx);
5425            view.handle_input(&Input("{".to_string()), cx);
5426            assert_eq!(
5427                view.text(cx),
5428                "
5429                {{{}}}
5430                {{{}}}
5431                /
5432
5433                "
5434                .unindent()
5435            );
5436
5437            view.move_right(&MoveRight, cx);
5438            view.handle_input(&Input("}".to_string()), cx);
5439            view.handle_input(&Input("}".to_string()), cx);
5440            view.handle_input(&Input("}".to_string()), cx);
5441            assert_eq!(
5442                view.text(cx),
5443                "
5444                {{{}}}}
5445                {{{}}}}
5446                /
5447
5448                "
5449                .unindent()
5450            );
5451
5452            view.undo(&Undo, cx);
5453            view.handle_input(&Input("/".to_string()), cx);
5454            view.handle_input(&Input("*".to_string()), cx);
5455            assert_eq!(
5456                view.text(cx),
5457                "
5458                /* */
5459                /* */
5460                /
5461
5462                "
5463                .unindent()
5464            );
5465
5466            view.undo(&Undo, cx);
5467            view.select_display_ranges(
5468                &[
5469                    DisplayPoint::new(2, 1)..DisplayPoint::new(2, 1),
5470                    DisplayPoint::new(3, 0)..DisplayPoint::new(3, 0),
5471                ],
5472                cx,
5473            )
5474            .unwrap();
5475            view.handle_input(&Input("*".to_string()), cx);
5476            assert_eq!(
5477                view.text(cx),
5478                "
5479                a
5480
5481                /*
5482                *
5483                "
5484                .unindent()
5485            );
5486        });
5487    }
5488
5489    #[gpui::test]
5490    async fn test_toggle_comment(mut cx: gpui::TestAppContext) {
5491        let settings = cx.read(EditorSettings::test);
5492        let language = Some(Arc::new(Language::new(
5493            LanguageConfig {
5494                line_comment: Some("// ".to_string()),
5495                ..Default::default()
5496            },
5497            Some(tree_sitter_rust::language()),
5498        )));
5499
5500        let text = "
5501            fn a() {
5502                //b();
5503                // c();
5504                //  d();
5505            }
5506        "
5507        .unindent();
5508
5509        let buffer = cx.add_model(|cx| Buffer::new(0, text, cx).with_language(language, None, cx));
5510        let (_, view) = cx.add_window(|cx| build_editor(buffer, settings, cx));
5511
5512        view.update(&mut cx, |editor, cx| {
5513            // If multiple selections intersect a line, the line is only
5514            // toggled once.
5515            editor
5516                .select_display_ranges(
5517                    &[
5518                        DisplayPoint::new(1, 3)..DisplayPoint::new(2, 3),
5519                        DisplayPoint::new(3, 5)..DisplayPoint::new(3, 6),
5520                    ],
5521                    cx,
5522                )
5523                .unwrap();
5524            editor.toggle_comments(&ToggleComments, cx);
5525            assert_eq!(
5526                editor.text(cx),
5527                "
5528                    fn a() {
5529                        b();
5530                        c();
5531                         d();
5532                    }
5533                "
5534                .unindent()
5535            );
5536
5537            // The comment prefix is inserted at the same column for every line
5538            // in a selection.
5539            editor
5540                .select_display_ranges(&[DisplayPoint::new(1, 3)..DisplayPoint::new(3, 6)], cx)
5541                .unwrap();
5542            editor.toggle_comments(&ToggleComments, cx);
5543            assert_eq!(
5544                editor.text(cx),
5545                "
5546                    fn a() {
5547                        // b();
5548                        // c();
5549                        //  d();
5550                    }
5551                "
5552                .unindent()
5553            );
5554
5555            // If a selection ends at the beginning of a line, that line is not toggled.
5556            editor
5557                .select_display_ranges(&[DisplayPoint::new(2, 0)..DisplayPoint::new(3, 0)], cx)
5558                .unwrap();
5559            editor.toggle_comments(&ToggleComments, cx);
5560            assert_eq!(
5561                editor.text(cx),
5562                "
5563                        fn a() {
5564                            // b();
5565                            c();
5566                            //  d();
5567                        }
5568                    "
5569                .unindent()
5570            );
5571        });
5572    }
5573
5574    #[gpui::test]
5575    async fn test_extra_newline_insertion(mut cx: gpui::TestAppContext) {
5576        let settings = cx.read(EditorSettings::test);
5577        let language = Some(Arc::new(Language::new(
5578            LanguageConfig {
5579                brackets: vec![
5580                    BracketPair {
5581                        start: "{".to_string(),
5582                        end: "}".to_string(),
5583                        close: true,
5584                        newline: true,
5585                    },
5586                    BracketPair {
5587                        start: "/* ".to_string(),
5588                        end: " */".to_string(),
5589                        close: true,
5590                        newline: true,
5591                    },
5592                ],
5593                ..Default::default()
5594            },
5595            Some(tree_sitter_rust::language()),
5596        )));
5597
5598        let text = concat!(
5599            "{   }\n",     // Suppress rustfmt
5600            "  x\n",       //
5601            "  /*   */\n", //
5602            "x\n",         //
5603            "{{} }\n",     //
5604        );
5605
5606        let buffer = cx.add_model(|cx| Buffer::new(0, text, cx).with_language(language, None, cx));
5607        let (_, view) = cx.add_window(|cx| build_editor(buffer, settings, cx));
5608        view.condition(&cx, |view, cx| !view.buffer.read(cx).is_parsing())
5609            .await;
5610
5611        view.update(&mut cx, |view, cx| {
5612            view.select_display_ranges(
5613                &[
5614                    DisplayPoint::new(0, 2)..DisplayPoint::new(0, 3),
5615                    DisplayPoint::new(2, 5)..DisplayPoint::new(2, 5),
5616                    DisplayPoint::new(4, 4)..DisplayPoint::new(4, 4),
5617                ],
5618                cx,
5619            )
5620            .unwrap();
5621            view.newline(&Newline, cx);
5622
5623            assert_eq!(
5624                view.buffer().read(cx).text(),
5625                concat!(
5626                    "{ \n",    // Suppress rustfmt
5627                    "\n",      //
5628                    "}\n",     //
5629                    "  x\n",   //
5630                    "  /* \n", //
5631                    "  \n",    //
5632                    "  */\n",  //
5633                    "x\n",     //
5634                    "{{} \n",  //
5635                    "}\n",     //
5636                )
5637            );
5638        });
5639    }
5640
5641    impl Editor {
5642        fn selection_ranges(&self, cx: &mut MutableAppContext) -> Vec<Range<DisplayPoint>> {
5643            self.intersecting_selections(
5644                self.selection_set_id,
5645                DisplayPoint::zero()..self.max_point(cx),
5646                cx,
5647            )
5648            .into_iter()
5649            .map(|s| {
5650                if s.reversed {
5651                    s.end..s.start
5652                } else {
5653                    s.start..s.end
5654                }
5655            })
5656            .collect()
5657        }
5658    }
5659
5660    fn empty_range(row: usize, column: usize) -> Range<DisplayPoint> {
5661        let point = DisplayPoint::new(row as u32, column as u32);
5662        point..point
5663    }
5664
5665    fn build_editor(
5666        buffer: ModelHandle<Buffer>,
5667        settings: EditorSettings,
5668        cx: &mut ViewContext<Editor>,
5669    ) -> Editor {
5670        Editor::for_buffer(buffer, move |_| settings.clone(), cx)
5671    }
5672}
5673
5674trait RangeExt<T> {
5675    fn sorted(&self) -> Range<T>;
5676    fn to_inclusive(&self) -> RangeInclusive<T>;
5677}
5678
5679impl<T: Ord + Clone> RangeExt<T> for Range<T> {
5680    fn sorted(&self) -> Self {
5681        cmp::min(&self.start, &self.end).clone()..cmp::max(&self.start, &self.end).clone()
5682    }
5683
5684    fn to_inclusive(&self) -> RangeInclusive<T> {
5685        self.start.clone()..=self.end.clone()
5686    }
5687}