1use super::{
   2    fold_map::FoldBufferRows,
   3    tab_map::{self, TabEdit, TabPoint, TabSnapshot},
   4    InlayHighlights, TextHighlights,
   5};
   6use crate::MultiBufferSnapshot;
   7use gpui::{
   8    fonts::{FontId, HighlightStyle},
   9    text_layout::LineWrapper,
  10    AppContext, Entity, ModelContext, ModelHandle, Task,
  11};
  12use language::{Chunk, Point};
  13use lazy_static::lazy_static;
  14use smol::future::yield_now;
  15use std::{cmp, collections::VecDeque, mem, ops::Range, time::Duration};
  16use sum_tree::{Bias, Cursor, SumTree};
  17use text::Patch;
  18
  19pub use super::tab_map::TextSummary;
  20pub type WrapEdit = text::Edit<u32>;
  21
  22pub struct WrapMap {
  23    snapshot: WrapSnapshot,
  24    pending_edits: VecDeque<(TabSnapshot, Vec<TabEdit>)>,
  25    interpolated_edits: Patch<u32>,
  26    edits_since_sync: Patch<u32>,
  27    wrap_width: Option<f32>,
  28    background_task: Option<Task<()>>,
  29    font: (FontId, f32),
  30}
  31
  32impl Entity for WrapMap {
  33    type Event = ();
  34}
  35
  36#[derive(Clone)]
  37pub struct WrapSnapshot {
  38    tab_snapshot: TabSnapshot,
  39    transforms: SumTree<Transform>,
  40    interpolated: bool,
  41}
  42
  43#[derive(Clone, Debug, Default, Eq, PartialEq)]
  44struct Transform {
  45    summary: TransformSummary,
  46    display_text: Option<&'static str>,
  47}
  48
  49#[derive(Clone, Debug, Default, Eq, PartialEq)]
  50struct TransformSummary {
  51    input: TextSummary,
  52    output: TextSummary,
  53}
  54
  55#[derive(Copy, Clone, Debug, Default, Eq, Ord, PartialOrd, PartialEq)]
  56pub struct WrapPoint(pub Point);
  57
  58pub struct WrapChunks<'a> {
  59    input_chunks: tab_map::TabChunks<'a>,
  60    input_chunk: Chunk<'a>,
  61    output_position: WrapPoint,
  62    max_output_row: u32,
  63    transforms: Cursor<'a, Transform, (WrapPoint, TabPoint)>,
  64}
  65
  66#[derive(Clone)]
  67pub struct WrapBufferRows<'a> {
  68    input_buffer_rows: FoldBufferRows<'a>,
  69    input_buffer_row: Option<u32>,
  70    output_row: u32,
  71    soft_wrapped: bool,
  72    max_output_row: u32,
  73    transforms: Cursor<'a, Transform, (WrapPoint, TabPoint)>,
  74}
  75
  76impl WrapMap {
  77    pub fn new(
  78        tab_snapshot: TabSnapshot,
  79        font_id: FontId,
  80        font_size: f32,
  81        wrap_width: Option<f32>,
  82        cx: &mut AppContext,
  83    ) -> (ModelHandle<Self>, WrapSnapshot) {
  84        let handle = cx.add_model(|cx| {
  85            let mut this = Self {
  86                font: (font_id, font_size),
  87                wrap_width: None,
  88                pending_edits: Default::default(),
  89                interpolated_edits: Default::default(),
  90                edits_since_sync: Default::default(),
  91                snapshot: WrapSnapshot::new(tab_snapshot),
  92                background_task: None,
  93            };
  94            this.set_wrap_width(wrap_width, cx);
  95            mem::take(&mut this.edits_since_sync);
  96            this
  97        });
  98        let snapshot = handle.read(cx).snapshot.clone();
  99        (handle, snapshot)
 100    }
 101
 102    #[cfg(test)]
 103    pub fn is_rewrapping(&self) -> bool {
 104        self.background_task.is_some()
 105    }
 106
 107    pub fn sync(
 108        &mut self,
 109        tab_snapshot: TabSnapshot,
 110        edits: Vec<TabEdit>,
 111        cx: &mut ModelContext<Self>,
 112    ) -> (WrapSnapshot, Patch<u32>) {
 113        if self.wrap_width.is_some() {
 114            self.pending_edits.push_back((tab_snapshot, edits));
 115            self.flush_edits(cx);
 116        } else {
 117            self.edits_since_sync = self
 118                .edits_since_sync
 119                .compose(&self.snapshot.interpolate(tab_snapshot, &edits));
 120            self.snapshot.interpolated = false;
 121        }
 122
 123        (self.snapshot.clone(), mem::take(&mut self.edits_since_sync))
 124    }
 125
 126    pub fn set_font(
 127        &mut self,
 128        font_id: FontId,
 129        font_size: f32,
 130        cx: &mut ModelContext<Self>,
 131    ) -> bool {
 132        if (font_id, font_size) != self.font {
 133            self.font = (font_id, font_size);
 134            self.rewrap(cx);
 135            true
 136        } else {
 137            false
 138        }
 139    }
 140
 141    pub fn set_wrap_width(&mut self, wrap_width: Option<f32>, cx: &mut ModelContext<Self>) -> bool {
 142        if wrap_width == self.wrap_width {
 143            return false;
 144        }
 145
 146        self.wrap_width = wrap_width;
 147        self.rewrap(cx);
 148        true
 149    }
 150
 151    fn rewrap(&mut self, cx: &mut ModelContext<Self>) {
 152        self.background_task.take();
 153        self.interpolated_edits.clear();
 154        self.pending_edits.clear();
 155
 156        if let Some(wrap_width) = self.wrap_width {
 157            let mut new_snapshot = self.snapshot.clone();
 158            let font_cache = cx.font_cache().clone();
 159            let (font_id, font_size) = self.font;
 160            let task = cx.background().spawn(async move {
 161                let mut line_wrapper = font_cache.line_wrapper(font_id, font_size);
 162                let tab_snapshot = new_snapshot.tab_snapshot.clone();
 163                let range = TabPoint::zero()..tab_snapshot.max_point();
 164                let edits = new_snapshot
 165                    .update(
 166                        tab_snapshot,
 167                        &[TabEdit {
 168                            old: range.clone(),
 169                            new: range.clone(),
 170                        }],
 171                        wrap_width,
 172                        &mut line_wrapper,
 173                    )
 174                    .await;
 175                (new_snapshot, edits)
 176            });
 177
 178            match cx
 179                .background()
 180                .block_with_timeout(Duration::from_millis(5), task)
 181            {
 182                Ok((snapshot, edits)) => {
 183                    self.snapshot = snapshot;
 184                    self.edits_since_sync = self.edits_since_sync.compose(&edits);
 185                    cx.notify();
 186                }
 187                Err(wrap_task) => {
 188                    self.background_task = Some(cx.spawn(|this, mut cx| async move {
 189                        let (snapshot, edits) = wrap_task.await;
 190                        this.update(&mut cx, |this, cx| {
 191                            this.snapshot = snapshot;
 192                            this.edits_since_sync = this
 193                                .edits_since_sync
 194                                .compose(mem::take(&mut this.interpolated_edits).invert())
 195                                .compose(&edits);
 196                            this.background_task = None;
 197                            this.flush_edits(cx);
 198                            cx.notify();
 199                        });
 200                    }));
 201                }
 202            }
 203        } else {
 204            let old_rows = self.snapshot.transforms.summary().output.lines.row + 1;
 205            self.snapshot.transforms = SumTree::new();
 206            let summary = self.snapshot.tab_snapshot.text_summary();
 207            if !summary.lines.is_zero() {
 208                self.snapshot
 209                    .transforms
 210                    .push(Transform::isomorphic(summary), &());
 211            }
 212            let new_rows = self.snapshot.transforms.summary().output.lines.row + 1;
 213            self.snapshot.interpolated = false;
 214            self.edits_since_sync = self.edits_since_sync.compose(&Patch::new(vec![WrapEdit {
 215                old: 0..old_rows,
 216                new: 0..new_rows,
 217            }]));
 218        }
 219    }
 220
 221    fn flush_edits(&mut self, cx: &mut ModelContext<Self>) {
 222        if !self.snapshot.interpolated {
 223            let mut to_remove_len = 0;
 224            for (tab_snapshot, _) in &self.pending_edits {
 225                if tab_snapshot.version <= self.snapshot.tab_snapshot.version {
 226                    to_remove_len += 1;
 227                } else {
 228                    break;
 229                }
 230            }
 231            self.pending_edits.drain(..to_remove_len);
 232        }
 233
 234        if self.pending_edits.is_empty() {
 235            return;
 236        }
 237
 238        if let Some(wrap_width) = self.wrap_width {
 239            if self.background_task.is_none() {
 240                let pending_edits = self.pending_edits.clone();
 241                let mut snapshot = self.snapshot.clone();
 242                let font_cache = cx.font_cache().clone();
 243                let (font_id, font_size) = self.font;
 244                let update_task = cx.background().spawn(async move {
 245                    let mut line_wrapper = font_cache.line_wrapper(font_id, font_size);
 246
 247                    let mut edits = Patch::default();
 248                    for (tab_snapshot, tab_edits) in pending_edits {
 249                        let wrap_edits = snapshot
 250                            .update(tab_snapshot, &tab_edits, wrap_width, &mut line_wrapper)
 251                            .await;
 252                        edits = edits.compose(&wrap_edits);
 253                    }
 254                    (snapshot, edits)
 255                });
 256
 257                match cx
 258                    .background()
 259                    .block_with_timeout(Duration::from_millis(1), update_task)
 260                {
 261                    Ok((snapshot, output_edits)) => {
 262                        self.snapshot = snapshot;
 263                        self.edits_since_sync = self.edits_since_sync.compose(&output_edits);
 264                    }
 265                    Err(update_task) => {
 266                        self.background_task = Some(cx.spawn(|this, mut cx| async move {
 267                            let (snapshot, edits) = update_task.await;
 268                            this.update(&mut cx, |this, cx| {
 269                                this.snapshot = snapshot;
 270                                this.edits_since_sync = this
 271                                    .edits_since_sync
 272                                    .compose(mem::take(&mut this.interpolated_edits).invert())
 273                                    .compose(&edits);
 274                                this.background_task = None;
 275                                this.flush_edits(cx);
 276                                cx.notify();
 277                            });
 278                        }));
 279                    }
 280                }
 281            }
 282        }
 283
 284        let was_interpolated = self.snapshot.interpolated;
 285        let mut to_remove_len = 0;
 286        for (tab_snapshot, edits) in &self.pending_edits {
 287            if tab_snapshot.version <= self.snapshot.tab_snapshot.version {
 288                to_remove_len += 1;
 289            } else {
 290                let interpolated_edits = self.snapshot.interpolate(tab_snapshot.clone(), edits);
 291                self.edits_since_sync = self.edits_since_sync.compose(&interpolated_edits);
 292                self.interpolated_edits = self.interpolated_edits.compose(&interpolated_edits);
 293            }
 294        }
 295
 296        if !was_interpolated {
 297            self.pending_edits.drain(..to_remove_len);
 298        }
 299    }
 300}
 301
 302impl WrapSnapshot {
 303    fn new(tab_snapshot: TabSnapshot) -> Self {
 304        let mut transforms = SumTree::new();
 305        let extent = tab_snapshot.text_summary();
 306        if !extent.lines.is_zero() {
 307            transforms.push(Transform::isomorphic(extent), &());
 308        }
 309        Self {
 310            transforms,
 311            tab_snapshot,
 312            interpolated: true,
 313        }
 314    }
 315
 316    pub fn buffer_snapshot(&self) -> &MultiBufferSnapshot {
 317        self.tab_snapshot.buffer_snapshot()
 318    }
 319
 320    fn interpolate(&mut self, new_tab_snapshot: TabSnapshot, tab_edits: &[TabEdit]) -> Patch<u32> {
 321        let mut new_transforms;
 322        if tab_edits.is_empty() {
 323            new_transforms = self.transforms.clone();
 324        } else {
 325            let mut old_cursor = self.transforms.cursor::<TabPoint>();
 326
 327            let mut tab_edits_iter = tab_edits.iter().peekable();
 328            new_transforms =
 329                old_cursor.slice(&tab_edits_iter.peek().unwrap().old.start, Bias::Right, &());
 330
 331            while let Some(edit) = tab_edits_iter.next() {
 332                if edit.new.start > TabPoint::from(new_transforms.summary().input.lines) {
 333                    let summary = new_tab_snapshot.text_summary_for_range(
 334                        TabPoint::from(new_transforms.summary().input.lines)..edit.new.start,
 335                    );
 336                    new_transforms.push_or_extend(Transform::isomorphic(summary));
 337                }
 338
 339                if !edit.new.is_empty() {
 340                    new_transforms.push_or_extend(Transform::isomorphic(
 341                        new_tab_snapshot.text_summary_for_range(edit.new.clone()),
 342                    ));
 343                }
 344
 345                old_cursor.seek_forward(&edit.old.end, Bias::Right, &());
 346                if let Some(next_edit) = tab_edits_iter.peek() {
 347                    if next_edit.old.start > old_cursor.end(&()) {
 348                        if old_cursor.end(&()) > edit.old.end {
 349                            let summary = self
 350                                .tab_snapshot
 351                                .text_summary_for_range(edit.old.end..old_cursor.end(&()));
 352                            new_transforms.push_or_extend(Transform::isomorphic(summary));
 353                        }
 354
 355                        old_cursor.next(&());
 356                        new_transforms.append(
 357                            old_cursor.slice(&next_edit.old.start, Bias::Right, &()),
 358                            &(),
 359                        );
 360                    }
 361                } else {
 362                    if old_cursor.end(&()) > edit.old.end {
 363                        let summary = self
 364                            .tab_snapshot
 365                            .text_summary_for_range(edit.old.end..old_cursor.end(&()));
 366                        new_transforms.push_or_extend(Transform::isomorphic(summary));
 367                    }
 368                    old_cursor.next(&());
 369                    new_transforms.append(old_cursor.suffix(&()), &());
 370                }
 371            }
 372        }
 373
 374        let old_snapshot = mem::replace(
 375            self,
 376            WrapSnapshot {
 377                tab_snapshot: new_tab_snapshot,
 378                transforms: new_transforms,
 379                interpolated: true,
 380            },
 381        );
 382        self.check_invariants();
 383        old_snapshot.compute_edits(tab_edits, self)
 384    }
 385
 386    async fn update(
 387        &mut self,
 388        new_tab_snapshot: TabSnapshot,
 389        tab_edits: &[TabEdit],
 390        wrap_width: f32,
 391        line_wrapper: &mut LineWrapper,
 392    ) -> Patch<u32> {
 393        #[derive(Debug)]
 394        struct RowEdit {
 395            old_rows: Range<u32>,
 396            new_rows: Range<u32>,
 397        }
 398
 399        let mut tab_edits_iter = tab_edits.iter().peekable();
 400        let mut row_edits = Vec::new();
 401        while let Some(edit) = tab_edits_iter.next() {
 402            let mut row_edit = RowEdit {
 403                old_rows: edit.old.start.row()..edit.old.end.row() + 1,
 404                new_rows: edit.new.start.row()..edit.new.end.row() + 1,
 405            };
 406
 407            while let Some(next_edit) = tab_edits_iter.peek() {
 408                if next_edit.old.start.row() <= row_edit.old_rows.end {
 409                    row_edit.old_rows.end = next_edit.old.end.row() + 1;
 410                    row_edit.new_rows.end = next_edit.new.end.row() + 1;
 411                    tab_edits_iter.next();
 412                } else {
 413                    break;
 414                }
 415            }
 416
 417            row_edits.push(row_edit);
 418        }
 419
 420        let mut new_transforms;
 421        if row_edits.is_empty() {
 422            new_transforms = self.transforms.clone();
 423        } else {
 424            let mut row_edits = row_edits.into_iter().peekable();
 425            let mut old_cursor = self.transforms.cursor::<TabPoint>();
 426
 427            new_transforms = old_cursor.slice(
 428                &TabPoint::new(row_edits.peek().unwrap().old_rows.start, 0),
 429                Bias::Right,
 430                &(),
 431            );
 432
 433            while let Some(edit) = row_edits.next() {
 434                if edit.new_rows.start > new_transforms.summary().input.lines.row {
 435                    let summary = new_tab_snapshot.text_summary_for_range(
 436                        TabPoint(new_transforms.summary().input.lines)
 437                            ..TabPoint::new(edit.new_rows.start, 0),
 438                    );
 439                    new_transforms.push_or_extend(Transform::isomorphic(summary));
 440                }
 441
 442                let mut line = String::new();
 443                let mut remaining = None;
 444                let mut chunks = new_tab_snapshot.chunks(
 445                    TabPoint::new(edit.new_rows.start, 0)..new_tab_snapshot.max_point(),
 446                    false,
 447                    None,
 448                    None,
 449                    None,
 450                    None,
 451                );
 452                let mut edit_transforms = Vec::<Transform>::new();
 453                for _ in edit.new_rows.start..edit.new_rows.end {
 454                    while let Some(chunk) =
 455                        remaining.take().or_else(|| chunks.next().map(|c| c.text))
 456                    {
 457                        if let Some(ix) = chunk.find('\n') {
 458                            line.push_str(&chunk[..ix + 1]);
 459                            remaining = Some(&chunk[ix + 1..]);
 460                            break;
 461                        } else {
 462                            line.push_str(chunk)
 463                        }
 464                    }
 465
 466                    if line.is_empty() {
 467                        break;
 468                    }
 469
 470                    let mut prev_boundary_ix = 0;
 471                    for boundary in line_wrapper.wrap_line(&line, wrap_width) {
 472                        let wrapped = &line[prev_boundary_ix..boundary.ix];
 473                        push_isomorphic(&mut edit_transforms, TextSummary::from(wrapped));
 474                        edit_transforms.push(Transform::wrap(boundary.next_indent));
 475                        prev_boundary_ix = boundary.ix;
 476                    }
 477
 478                    if prev_boundary_ix < line.len() {
 479                        push_isomorphic(
 480                            &mut edit_transforms,
 481                            TextSummary::from(&line[prev_boundary_ix..]),
 482                        );
 483                    }
 484
 485                    line.clear();
 486                    yield_now().await;
 487                }
 488
 489                let mut edit_transforms = edit_transforms.into_iter();
 490                if let Some(transform) = edit_transforms.next() {
 491                    new_transforms.push_or_extend(transform);
 492                }
 493                new_transforms.extend(edit_transforms, &());
 494
 495                old_cursor.seek_forward(&TabPoint::new(edit.old_rows.end, 0), Bias::Right, &());
 496                if let Some(next_edit) = row_edits.peek() {
 497                    if next_edit.old_rows.start > old_cursor.end(&()).row() {
 498                        if old_cursor.end(&()) > TabPoint::new(edit.old_rows.end, 0) {
 499                            let summary = self.tab_snapshot.text_summary_for_range(
 500                                TabPoint::new(edit.old_rows.end, 0)..old_cursor.end(&()),
 501                            );
 502                            new_transforms.push_or_extend(Transform::isomorphic(summary));
 503                        }
 504                        old_cursor.next(&());
 505                        new_transforms.append(
 506                            old_cursor.slice(
 507                                &TabPoint::new(next_edit.old_rows.start, 0),
 508                                Bias::Right,
 509                                &(),
 510                            ),
 511                            &(),
 512                        );
 513                    }
 514                } else {
 515                    if old_cursor.end(&()) > TabPoint::new(edit.old_rows.end, 0) {
 516                        let summary = self.tab_snapshot.text_summary_for_range(
 517                            TabPoint::new(edit.old_rows.end, 0)..old_cursor.end(&()),
 518                        );
 519                        new_transforms.push_or_extend(Transform::isomorphic(summary));
 520                    }
 521                    old_cursor.next(&());
 522                    new_transforms.append(old_cursor.suffix(&()), &());
 523                }
 524            }
 525        }
 526
 527        let old_snapshot = mem::replace(
 528            self,
 529            WrapSnapshot {
 530                tab_snapshot: new_tab_snapshot,
 531                transforms: new_transforms,
 532                interpolated: false,
 533            },
 534        );
 535        self.check_invariants();
 536        old_snapshot.compute_edits(tab_edits, self)
 537    }
 538
 539    fn compute_edits(&self, tab_edits: &[TabEdit], new_snapshot: &WrapSnapshot) -> Patch<u32> {
 540        let mut wrap_edits = Vec::new();
 541        let mut old_cursor = self.transforms.cursor::<TransformSummary>();
 542        let mut new_cursor = new_snapshot.transforms.cursor::<TransformSummary>();
 543        for mut tab_edit in tab_edits.iter().cloned() {
 544            tab_edit.old.start.0.column = 0;
 545            tab_edit.old.end.0 += Point::new(1, 0);
 546            tab_edit.new.start.0.column = 0;
 547            tab_edit.new.end.0 += Point::new(1, 0);
 548
 549            old_cursor.seek(&tab_edit.old.start, Bias::Right, &());
 550            let mut old_start = old_cursor.start().output.lines;
 551            old_start += tab_edit.old.start.0 - old_cursor.start().input.lines;
 552
 553            old_cursor.seek(&tab_edit.old.end, Bias::Right, &());
 554            let mut old_end = old_cursor.start().output.lines;
 555            old_end += tab_edit.old.end.0 - old_cursor.start().input.lines;
 556
 557            new_cursor.seek(&tab_edit.new.start, Bias::Right, &());
 558            let mut new_start = new_cursor.start().output.lines;
 559            new_start += tab_edit.new.start.0 - new_cursor.start().input.lines;
 560
 561            new_cursor.seek(&tab_edit.new.end, Bias::Right, &());
 562            let mut new_end = new_cursor.start().output.lines;
 563            new_end += tab_edit.new.end.0 - new_cursor.start().input.lines;
 564
 565            wrap_edits.push(WrapEdit {
 566                old: old_start.row..old_end.row,
 567                new: new_start.row..new_end.row,
 568            });
 569        }
 570
 571        consolidate_wrap_edits(&mut wrap_edits);
 572        Patch::new(wrap_edits)
 573    }
 574
 575    pub fn chunks<'a>(
 576        &'a self,
 577        rows: Range<u32>,
 578        language_aware: bool,
 579        text_highlights: Option<&'a TextHighlights>,
 580        inlay_highlights: Option<&'a InlayHighlights>,
 581        inlay_highlight_style: Option<HighlightStyle>,
 582        suggestion_highlight_style: Option<HighlightStyle>,
 583    ) -> WrapChunks<'a> {
 584        let output_start = WrapPoint::new(rows.start, 0);
 585        let output_end = WrapPoint::new(rows.end, 0);
 586        let mut transforms = self.transforms.cursor::<(WrapPoint, TabPoint)>();
 587        transforms.seek(&output_start, Bias::Right, &());
 588        let mut input_start = TabPoint(transforms.start().1 .0);
 589        if transforms.item().map_or(false, |t| t.is_isomorphic()) {
 590            input_start.0 += output_start.0 - transforms.start().0 .0;
 591        }
 592        let input_end = self
 593            .to_tab_point(output_end)
 594            .min(self.tab_snapshot.max_point());
 595        WrapChunks {
 596            input_chunks: self.tab_snapshot.chunks(
 597                input_start..input_end,
 598                language_aware,
 599                text_highlights,
 600                inlay_highlights,
 601                inlay_highlight_style,
 602                suggestion_highlight_style,
 603            ),
 604            input_chunk: Default::default(),
 605            output_position: output_start,
 606            max_output_row: rows.end,
 607            transforms,
 608        }
 609    }
 610
 611    pub fn max_point(&self) -> WrapPoint {
 612        WrapPoint(self.transforms.summary().output.lines)
 613    }
 614
 615    pub fn line_len(&self, row: u32) -> u32 {
 616        let mut cursor = self.transforms.cursor::<(WrapPoint, TabPoint)>();
 617        cursor.seek(&WrapPoint::new(row + 1, 0), Bias::Left, &());
 618        if cursor
 619            .item()
 620            .map_or(false, |transform| transform.is_isomorphic())
 621        {
 622            let overshoot = row - cursor.start().0.row();
 623            let tab_row = cursor.start().1.row() + overshoot;
 624            let tab_line_len = self.tab_snapshot.line_len(tab_row);
 625            if overshoot == 0 {
 626                cursor.start().0.column() + (tab_line_len - cursor.start().1.column())
 627            } else {
 628                tab_line_len
 629            }
 630        } else {
 631            cursor.start().0.column()
 632        }
 633    }
 634
 635    pub fn soft_wrap_indent(&self, row: u32) -> Option<u32> {
 636        let mut cursor = self.transforms.cursor::<WrapPoint>();
 637        cursor.seek(&WrapPoint::new(row + 1, 0), Bias::Right, &());
 638        cursor.item().and_then(|transform| {
 639            if transform.is_isomorphic() {
 640                None
 641            } else {
 642                Some(transform.summary.output.lines.column)
 643            }
 644        })
 645    }
 646
 647    pub fn longest_row(&self) -> u32 {
 648        self.transforms.summary().output.longest_row
 649    }
 650
 651    pub fn buffer_rows(&self, start_row: u32) -> WrapBufferRows {
 652        let mut transforms = self.transforms.cursor::<(WrapPoint, TabPoint)>();
 653        transforms.seek(&WrapPoint::new(start_row, 0), Bias::Left, &());
 654        let mut input_row = transforms.start().1.row();
 655        if transforms.item().map_or(false, |t| t.is_isomorphic()) {
 656            input_row += start_row - transforms.start().0.row();
 657        }
 658        let soft_wrapped = transforms.item().map_or(false, |t| !t.is_isomorphic());
 659        let mut input_buffer_rows = self.tab_snapshot.buffer_rows(input_row);
 660        let input_buffer_row = input_buffer_rows.next().unwrap();
 661        WrapBufferRows {
 662            transforms,
 663            input_buffer_row,
 664            input_buffer_rows,
 665            output_row: start_row,
 666            soft_wrapped,
 667            max_output_row: self.max_point().row(),
 668        }
 669    }
 670
 671    pub fn to_tab_point(&self, point: WrapPoint) -> TabPoint {
 672        let mut cursor = self.transforms.cursor::<(WrapPoint, TabPoint)>();
 673        cursor.seek(&point, Bias::Right, &());
 674        let mut tab_point = cursor.start().1 .0;
 675        if cursor.item().map_or(false, |t| t.is_isomorphic()) {
 676            tab_point += point.0 - cursor.start().0 .0;
 677        }
 678        TabPoint(tab_point)
 679    }
 680
 681    pub fn to_point(&self, point: WrapPoint, bias: Bias) -> Point {
 682        self.tab_snapshot.to_point(self.to_tab_point(point), bias)
 683    }
 684
 685    pub fn make_wrap_point(&self, point: Point, bias: Bias) -> WrapPoint {
 686        self.tab_point_to_wrap_point(self.tab_snapshot.make_tab_point(point, bias))
 687    }
 688
 689    pub fn tab_point_to_wrap_point(&self, point: TabPoint) -> WrapPoint {
 690        let mut cursor = self.transforms.cursor::<(TabPoint, WrapPoint)>();
 691        cursor.seek(&point, Bias::Right, &());
 692        WrapPoint(cursor.start().1 .0 + (point.0 - cursor.start().0 .0))
 693    }
 694
 695    pub fn clip_point(&self, mut point: WrapPoint, bias: Bias) -> WrapPoint {
 696        if bias == Bias::Left {
 697            let mut cursor = self.transforms.cursor::<WrapPoint>();
 698            cursor.seek(&point, Bias::Right, &());
 699            if cursor.item().map_or(false, |t| !t.is_isomorphic()) {
 700                point = *cursor.start();
 701                *point.column_mut() -= 1;
 702            }
 703        }
 704
 705        self.tab_point_to_wrap_point(self.tab_snapshot.clip_point(self.to_tab_point(point), bias))
 706    }
 707
 708    pub fn prev_row_boundary(&self, mut point: WrapPoint) -> u32 {
 709        if self.transforms.is_empty() {
 710            return 0;
 711        }
 712
 713        *point.column_mut() = 0;
 714
 715        let mut cursor = self.transforms.cursor::<(WrapPoint, TabPoint)>();
 716        cursor.seek(&point, Bias::Right, &());
 717        if cursor.item().is_none() {
 718            cursor.prev(&());
 719        }
 720
 721        while let Some(transform) = cursor.item() {
 722            if transform.is_isomorphic() && cursor.start().1.column() == 0 {
 723                return cmp::min(cursor.end(&()).0.row(), point.row());
 724            } else {
 725                cursor.prev(&());
 726            }
 727        }
 728
 729        unreachable!()
 730    }
 731
 732    pub fn next_row_boundary(&self, mut point: WrapPoint) -> Option<u32> {
 733        point.0 += Point::new(1, 0);
 734
 735        let mut cursor = self.transforms.cursor::<(WrapPoint, TabPoint)>();
 736        cursor.seek(&point, Bias::Right, &());
 737        while let Some(transform) = cursor.item() {
 738            if transform.is_isomorphic() && cursor.start().1.column() == 0 {
 739                return Some(cmp::max(cursor.start().0.row(), point.row()));
 740            } else {
 741                cursor.next(&());
 742            }
 743        }
 744
 745        None
 746    }
 747
 748    fn check_invariants(&self) {
 749        #[cfg(test)]
 750        {
 751            assert_eq!(
 752                TabPoint::from(self.transforms.summary().input.lines),
 753                self.tab_snapshot.max_point()
 754            );
 755
 756            {
 757                let mut transforms = self.transforms.cursor::<()>().peekable();
 758                while let Some(transform) = transforms.next() {
 759                    if let Some(next_transform) = transforms.peek() {
 760                        assert!(transform.is_isomorphic() != next_transform.is_isomorphic());
 761                    }
 762                }
 763            }
 764
 765            let text = language::Rope::from(self.text().as_str());
 766            let mut input_buffer_rows = self.tab_snapshot.buffer_rows(0);
 767            let mut expected_buffer_rows = Vec::new();
 768            let mut prev_tab_row = 0;
 769            for display_row in 0..=self.max_point().row() {
 770                let tab_point = self.to_tab_point(WrapPoint::new(display_row, 0));
 771                if tab_point.row() == prev_tab_row && display_row != 0 {
 772                    expected_buffer_rows.push(None);
 773                } else {
 774                    expected_buffer_rows.push(input_buffer_rows.next().unwrap());
 775                }
 776
 777                prev_tab_row = tab_point.row();
 778                assert_eq!(self.line_len(display_row), text.line_len(display_row));
 779            }
 780
 781            for start_display_row in 0..expected_buffer_rows.len() {
 782                assert_eq!(
 783                    self.buffer_rows(start_display_row as u32)
 784                        .collect::<Vec<_>>(),
 785                    &expected_buffer_rows[start_display_row..],
 786                    "invalid buffer_rows({}..)",
 787                    start_display_row
 788                );
 789            }
 790        }
 791    }
 792}
 793
 794impl<'a> Iterator for WrapChunks<'a> {
 795    type Item = Chunk<'a>;
 796
 797    fn next(&mut self) -> Option<Self::Item> {
 798        if self.output_position.row() >= self.max_output_row {
 799            return None;
 800        }
 801
 802        let transform = self.transforms.item()?;
 803        if let Some(display_text) = transform.display_text {
 804            let mut start_ix = 0;
 805            let mut end_ix = display_text.len();
 806            let mut summary = transform.summary.output.lines;
 807
 808            if self.output_position > self.transforms.start().0 {
 809                // Exclude newline starting prior to the desired row.
 810                start_ix = 1;
 811                summary.row = 0;
 812            } else if self.output_position.row() + 1 >= self.max_output_row {
 813                // Exclude soft indentation ending after the desired row.
 814                end_ix = 1;
 815                summary.column = 0;
 816            }
 817
 818            self.output_position.0 += summary;
 819            self.transforms.next(&());
 820            return Some(Chunk {
 821                text: &display_text[start_ix..end_ix],
 822                ..self.input_chunk
 823            });
 824        }
 825
 826        if self.input_chunk.text.is_empty() {
 827            self.input_chunk = self.input_chunks.next().unwrap();
 828        }
 829
 830        let mut input_len = 0;
 831        let transform_end = self.transforms.end(&()).0;
 832        for c in self.input_chunk.text.chars() {
 833            let char_len = c.len_utf8();
 834            input_len += char_len;
 835            if c == '\n' {
 836                *self.output_position.row_mut() += 1;
 837                *self.output_position.column_mut() = 0;
 838            } else {
 839                *self.output_position.column_mut() += char_len as u32;
 840            }
 841
 842            if self.output_position >= transform_end {
 843                self.transforms.next(&());
 844                break;
 845            }
 846        }
 847
 848        let (prefix, suffix) = self.input_chunk.text.split_at(input_len);
 849        self.input_chunk.text = suffix;
 850        Some(Chunk {
 851            text: prefix,
 852            ..self.input_chunk
 853        })
 854    }
 855}
 856
 857impl<'a> Iterator for WrapBufferRows<'a> {
 858    type Item = Option<u32>;
 859
 860    fn next(&mut self) -> Option<Self::Item> {
 861        if self.output_row > self.max_output_row {
 862            return None;
 863        }
 864
 865        let buffer_row = self.input_buffer_row;
 866        let soft_wrapped = self.soft_wrapped;
 867
 868        self.output_row += 1;
 869        self.transforms
 870            .seek_forward(&WrapPoint::new(self.output_row, 0), Bias::Left, &());
 871        if self.transforms.item().map_or(false, |t| t.is_isomorphic()) {
 872            self.input_buffer_row = self.input_buffer_rows.next().unwrap();
 873            self.soft_wrapped = false;
 874        } else {
 875            self.soft_wrapped = true;
 876        }
 877
 878        Some(if soft_wrapped { None } else { buffer_row })
 879    }
 880}
 881
 882impl Transform {
 883    fn isomorphic(summary: TextSummary) -> Self {
 884        #[cfg(test)]
 885        assert!(!summary.lines.is_zero());
 886
 887        Self {
 888            summary: TransformSummary {
 889                input: summary.clone(),
 890                output: summary,
 891            },
 892            display_text: None,
 893        }
 894    }
 895
 896    fn wrap(indent: u32) -> Self {
 897        lazy_static! {
 898            static ref WRAP_TEXT: String = {
 899                let mut wrap_text = String::new();
 900                wrap_text.push('\n');
 901                wrap_text.extend((0..LineWrapper::MAX_INDENT as usize).map(|_| ' '));
 902                wrap_text
 903            };
 904        }
 905
 906        Self {
 907            summary: TransformSummary {
 908                input: TextSummary::default(),
 909                output: TextSummary {
 910                    lines: Point::new(1, indent),
 911                    first_line_chars: 0,
 912                    last_line_chars: indent,
 913                    longest_row: 1,
 914                    longest_row_chars: indent,
 915                },
 916            },
 917            display_text: Some(&WRAP_TEXT[..1 + indent as usize]),
 918        }
 919    }
 920
 921    fn is_isomorphic(&self) -> bool {
 922        self.display_text.is_none()
 923    }
 924}
 925
 926impl sum_tree::Item for Transform {
 927    type Summary = TransformSummary;
 928
 929    fn summary(&self) -> Self::Summary {
 930        self.summary.clone()
 931    }
 932}
 933
 934fn push_isomorphic(transforms: &mut Vec<Transform>, summary: TextSummary) {
 935    if let Some(last_transform) = transforms.last_mut() {
 936        if last_transform.is_isomorphic() {
 937            last_transform.summary.input += &summary;
 938            last_transform.summary.output += &summary;
 939            return;
 940        }
 941    }
 942    transforms.push(Transform::isomorphic(summary));
 943}
 944
 945trait SumTreeExt {
 946    fn push_or_extend(&mut self, transform: Transform);
 947}
 948
 949impl SumTreeExt for SumTree<Transform> {
 950    fn push_or_extend(&mut self, transform: Transform) {
 951        let mut transform = Some(transform);
 952        self.update_last(
 953            |last_transform| {
 954                if last_transform.is_isomorphic() && transform.as_ref().unwrap().is_isomorphic() {
 955                    let transform = transform.take().unwrap();
 956                    last_transform.summary.input += &transform.summary.input;
 957                    last_transform.summary.output += &transform.summary.output;
 958                }
 959            },
 960            &(),
 961        );
 962
 963        if let Some(transform) = transform {
 964            self.push(transform, &());
 965        }
 966    }
 967}
 968
 969impl WrapPoint {
 970    pub fn new(row: u32, column: u32) -> Self {
 971        Self(Point::new(row, column))
 972    }
 973
 974    pub fn row(self) -> u32 {
 975        self.0.row
 976    }
 977
 978    pub fn row_mut(&mut self) -> &mut u32 {
 979        &mut self.0.row
 980    }
 981
 982    pub fn column(self) -> u32 {
 983        self.0.column
 984    }
 985
 986    pub fn column_mut(&mut self) -> &mut u32 {
 987        &mut self.0.column
 988    }
 989}
 990
 991impl sum_tree::Summary for TransformSummary {
 992    type Context = ();
 993
 994    fn add_summary(&mut self, other: &Self, _: &()) {
 995        self.input += &other.input;
 996        self.output += &other.output;
 997    }
 998}
 999
1000impl<'a> sum_tree::Dimension<'a, TransformSummary> for TabPoint {
1001    fn add_summary(&mut self, summary: &'a TransformSummary, _: &()) {
1002        self.0 += summary.input.lines;
1003    }
1004}
1005
1006impl<'a> sum_tree::SeekTarget<'a, TransformSummary, TransformSummary> for TabPoint {
1007    fn cmp(&self, cursor_location: &TransformSummary, _: &()) -> std::cmp::Ordering {
1008        Ord::cmp(&self.0, &cursor_location.input.lines)
1009    }
1010}
1011
1012impl<'a> sum_tree::Dimension<'a, TransformSummary> for WrapPoint {
1013    fn add_summary(&mut self, summary: &'a TransformSummary, _: &()) {
1014        self.0 += summary.output.lines;
1015    }
1016}
1017
1018fn consolidate_wrap_edits(edits: &mut Vec<WrapEdit>) {
1019    let mut i = 1;
1020    while i < edits.len() {
1021        let edit = edits[i].clone();
1022        let prev_edit = &mut edits[i - 1];
1023        if prev_edit.old.end >= edit.old.start {
1024            prev_edit.old.end = edit.old.end;
1025            prev_edit.new.end = edit.new.end;
1026            edits.remove(i);
1027            continue;
1028        }
1029        i += 1;
1030    }
1031}
1032
1033#[cfg(test)]
1034mod tests {
1035    use super::*;
1036    use crate::{
1037        display_map::{fold_map::FoldMap, inlay_map::InlayMap, tab_map::TabMap},
1038        MultiBuffer,
1039    };
1040    use gpui::test::observe;
1041    use rand::prelude::*;
1042    use settings::SettingsStore;
1043    use smol::stream::StreamExt;
1044    use std::{cmp, env, num::NonZeroU32};
1045    use text::Rope;
1046
1047    #[gpui::test(iterations = 100)]
1048    async fn test_random_wraps(cx: &mut gpui::TestAppContext, mut rng: StdRng) {
1049        init_test(cx);
1050
1051        cx.foreground().set_block_on_ticks(0..=50);
1052        let operations = env::var("OPERATIONS")
1053            .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
1054            .unwrap_or(10);
1055
1056        let font_cache = cx.font_cache().clone();
1057        let font_system = cx.platform().fonts();
1058        let mut wrap_width = if rng.gen_bool(0.1) {
1059            None
1060        } else {
1061            Some(rng.gen_range(0.0..=1000.0))
1062        };
1063        let tab_size = NonZeroU32::new(rng.gen_range(1..=4)).unwrap();
1064        let family_id = font_cache
1065            .load_family(&["Helvetica"], &Default::default())
1066            .unwrap();
1067        let font_id = font_cache
1068            .select_font(family_id, &Default::default())
1069            .unwrap();
1070        let font_size = 14.0;
1071
1072        log::info!("Tab size: {}", tab_size);
1073        log::info!("Wrap width: {:?}", wrap_width);
1074
1075        let buffer = cx.update(|cx| {
1076            if rng.gen() {
1077                MultiBuffer::build_random(&mut rng, cx)
1078            } else {
1079                let len = rng.gen_range(0..10);
1080                let text = util::RandomCharIter::new(&mut rng)
1081                    .take(len)
1082                    .collect::<String>();
1083                MultiBuffer::build_simple(&text, cx)
1084            }
1085        });
1086        let mut buffer_snapshot = buffer.read_with(cx, |buffer, cx| buffer.snapshot(cx));
1087        log::info!("Buffer text: {:?}", buffer_snapshot.text());
1088        let (mut inlay_map, inlay_snapshot) = InlayMap::new(buffer_snapshot.clone());
1089        log::info!("InlayMap text: {:?}", inlay_snapshot.text());
1090        let (mut fold_map, fold_snapshot) = FoldMap::new(inlay_snapshot.clone());
1091        log::info!("FoldMap text: {:?}", fold_snapshot.text());
1092        let (mut tab_map, _) = TabMap::new(fold_snapshot.clone(), tab_size);
1093        let tabs_snapshot = tab_map.set_max_expansion_column(32);
1094        log::info!("TabMap text: {:?}", tabs_snapshot.text());
1095
1096        let mut line_wrapper = LineWrapper::new(font_id, font_size, font_system);
1097        let unwrapped_text = tabs_snapshot.text();
1098        let expected_text = wrap_text(&unwrapped_text, wrap_width, &mut line_wrapper);
1099
1100        let (wrap_map, _) =
1101            cx.update(|cx| WrapMap::new(tabs_snapshot.clone(), font_id, font_size, wrap_width, cx));
1102        let mut notifications = observe(&wrap_map, cx);
1103
1104        if wrap_map.read_with(cx, |map, _| map.is_rewrapping()) {
1105            notifications.next().await.unwrap();
1106        }
1107
1108        let (initial_snapshot, _) = wrap_map.update(cx, |map, cx| {
1109            assert!(!map.is_rewrapping());
1110            map.sync(tabs_snapshot.clone(), Vec::new(), cx)
1111        });
1112
1113        let actual_text = initial_snapshot.text();
1114        assert_eq!(
1115            actual_text, expected_text,
1116            "unwrapped text is: {:?}",
1117            unwrapped_text
1118        );
1119        log::info!("Wrapped text: {:?}", actual_text);
1120
1121        let mut next_inlay_id = 0;
1122        let mut edits = Vec::new();
1123        for _i in 0..operations {
1124            log::info!("{} ==============================================", _i);
1125
1126            let mut buffer_edits = Vec::new();
1127            match rng.gen_range(0..=100) {
1128                0..=19 => {
1129                    wrap_width = if rng.gen_bool(0.2) {
1130                        None
1131                    } else {
1132                        Some(rng.gen_range(0.0..=1000.0))
1133                    };
1134                    log::info!("Setting wrap width to {:?}", wrap_width);
1135                    wrap_map.update(cx, |map, cx| map.set_wrap_width(wrap_width, cx));
1136                }
1137                20..=39 => {
1138                    for (fold_snapshot, fold_edits) in fold_map.randomly_mutate(&mut rng) {
1139                        let (tabs_snapshot, tab_edits) =
1140                            tab_map.sync(fold_snapshot, fold_edits, tab_size);
1141                        let (mut snapshot, wrap_edits) =
1142                            wrap_map.update(cx, |map, cx| map.sync(tabs_snapshot, tab_edits, cx));
1143                        snapshot.check_invariants();
1144                        snapshot.verify_chunks(&mut rng);
1145                        edits.push((snapshot, wrap_edits));
1146                    }
1147                }
1148                40..=59 => {
1149                    let (inlay_snapshot, inlay_edits) =
1150                        inlay_map.randomly_mutate(&mut next_inlay_id, &mut rng);
1151                    let (fold_snapshot, fold_edits) = fold_map.read(inlay_snapshot, inlay_edits);
1152                    let (tabs_snapshot, tab_edits) =
1153                        tab_map.sync(fold_snapshot, fold_edits, tab_size);
1154                    let (mut snapshot, wrap_edits) =
1155                        wrap_map.update(cx, |map, cx| map.sync(tabs_snapshot, tab_edits, cx));
1156                    snapshot.check_invariants();
1157                    snapshot.verify_chunks(&mut rng);
1158                    edits.push((snapshot, wrap_edits));
1159                }
1160                _ => {
1161                    buffer.update(cx, |buffer, cx| {
1162                        let subscription = buffer.subscribe();
1163                        let edit_count = rng.gen_range(1..=5);
1164                        buffer.randomly_mutate(&mut rng, edit_count, cx);
1165                        buffer_snapshot = buffer.snapshot(cx);
1166                        buffer_edits.extend(subscription.consume());
1167                    });
1168                }
1169            }
1170
1171            log::info!("Buffer text: {:?}", buffer_snapshot.text());
1172            let (inlay_snapshot, inlay_edits) =
1173                inlay_map.sync(buffer_snapshot.clone(), buffer_edits);
1174            log::info!("InlayMap text: {:?}", inlay_snapshot.text());
1175            let (fold_snapshot, fold_edits) = fold_map.read(inlay_snapshot, inlay_edits);
1176            log::info!("FoldMap text: {:?}", fold_snapshot.text());
1177            let (tabs_snapshot, tab_edits) = tab_map.sync(fold_snapshot, fold_edits, tab_size);
1178            log::info!("TabMap text: {:?}", tabs_snapshot.text());
1179
1180            let unwrapped_text = tabs_snapshot.text();
1181            let expected_text = wrap_text(&unwrapped_text, wrap_width, &mut line_wrapper);
1182            let (mut snapshot, wrap_edits) =
1183                wrap_map.update(cx, |map, cx| map.sync(tabs_snapshot.clone(), tab_edits, cx));
1184            snapshot.check_invariants();
1185            snapshot.verify_chunks(&mut rng);
1186            edits.push((snapshot, wrap_edits));
1187
1188            if wrap_map.read_with(cx, |map, _| map.is_rewrapping()) && rng.gen_bool(0.4) {
1189                log::info!("Waiting for wrapping to finish");
1190                while wrap_map.read_with(cx, |map, _| map.is_rewrapping()) {
1191                    notifications.next().await.unwrap();
1192                }
1193                wrap_map.read_with(cx, |map, _| assert!(map.pending_edits.is_empty()));
1194            }
1195
1196            if !wrap_map.read_with(cx, |map, _| map.is_rewrapping()) {
1197                let (mut wrapped_snapshot, wrap_edits) =
1198                    wrap_map.update(cx, |map, cx| map.sync(tabs_snapshot, Vec::new(), cx));
1199                let actual_text = wrapped_snapshot.text();
1200                let actual_longest_row = wrapped_snapshot.longest_row();
1201                log::info!("Wrapping finished: {:?}", actual_text);
1202                wrapped_snapshot.check_invariants();
1203                wrapped_snapshot.verify_chunks(&mut rng);
1204                edits.push((wrapped_snapshot.clone(), wrap_edits));
1205                assert_eq!(
1206                    actual_text, expected_text,
1207                    "unwrapped text is: {:?}",
1208                    unwrapped_text
1209                );
1210
1211                let mut summary = TextSummary::default();
1212                for (ix, item) in wrapped_snapshot
1213                    .transforms
1214                    .items(&())
1215                    .into_iter()
1216                    .enumerate()
1217                {
1218                    summary += &item.summary.output;
1219                    log::info!("{} summary: {:?}", ix, item.summary.output,);
1220                }
1221
1222                if tab_size.get() == 1
1223                    || !wrapped_snapshot
1224                        .tab_snapshot
1225                        .fold_snapshot
1226                        .text()
1227                        .contains('\t')
1228                {
1229                    let mut expected_longest_rows = Vec::new();
1230                    let mut longest_line_len = -1;
1231                    for (row, line) in expected_text.split('\n').enumerate() {
1232                        let line_char_count = line.chars().count() as isize;
1233                        if line_char_count > longest_line_len {
1234                            expected_longest_rows.clear();
1235                            longest_line_len = line_char_count;
1236                        }
1237                        if line_char_count >= longest_line_len {
1238                            expected_longest_rows.push(row as u32);
1239                        }
1240                    }
1241
1242                    assert!(
1243                        expected_longest_rows.contains(&actual_longest_row),
1244                        "incorrect longest row {}. expected {:?} with length {}",
1245                        actual_longest_row,
1246                        expected_longest_rows,
1247                        longest_line_len,
1248                    )
1249                }
1250            }
1251        }
1252
1253        let mut initial_text = Rope::from(initial_snapshot.text().as_str());
1254        for (snapshot, patch) in edits {
1255            let snapshot_text = Rope::from(snapshot.text().as_str());
1256            for edit in &patch {
1257                let old_start = initial_text.point_to_offset(Point::new(edit.new.start, 0));
1258                let old_end = initial_text.point_to_offset(cmp::min(
1259                    Point::new(edit.new.start + edit.old.len() as u32, 0),
1260                    initial_text.max_point(),
1261                ));
1262                let new_start = snapshot_text.point_to_offset(Point::new(edit.new.start, 0));
1263                let new_end = snapshot_text.point_to_offset(cmp::min(
1264                    Point::new(edit.new.end, 0),
1265                    snapshot_text.max_point(),
1266                ));
1267                let new_text = snapshot_text
1268                    .chunks_in_range(new_start..new_end)
1269                    .collect::<String>();
1270
1271                initial_text.replace(old_start..old_end, &new_text);
1272            }
1273            assert_eq!(initial_text.to_string(), snapshot_text.to_string());
1274        }
1275
1276        if wrap_map.read_with(cx, |map, _| map.is_rewrapping()) {
1277            log::info!("Waiting for wrapping to finish");
1278            while wrap_map.read_with(cx, |map, _| map.is_rewrapping()) {
1279                notifications.next().await.unwrap();
1280            }
1281        }
1282        wrap_map.read_with(cx, |map, _| assert!(map.pending_edits.is_empty()));
1283    }
1284
1285    fn init_test(cx: &mut gpui::TestAppContext) {
1286        cx.foreground().forbid_parking();
1287        cx.update(|cx| {
1288            cx.set_global(SettingsStore::test(cx));
1289            theme::init((), cx);
1290        });
1291    }
1292
1293    fn wrap_text(
1294        unwrapped_text: &str,
1295        wrap_width: Option<f32>,
1296        line_wrapper: &mut LineWrapper,
1297    ) -> String {
1298        if let Some(wrap_width) = wrap_width {
1299            let mut wrapped_text = String::new();
1300            for (row, line) in unwrapped_text.split('\n').enumerate() {
1301                if row > 0 {
1302                    wrapped_text.push('\n')
1303                }
1304
1305                let mut prev_ix = 0;
1306                for boundary in line_wrapper.wrap_line(line, wrap_width) {
1307                    wrapped_text.push_str(&line[prev_ix..boundary.ix]);
1308                    wrapped_text.push('\n');
1309                    wrapped_text.push_str(&" ".repeat(boundary.next_indent as usize));
1310                    prev_ix = boundary.ix;
1311                }
1312                wrapped_text.push_str(&line[prev_ix..]);
1313            }
1314            wrapped_text
1315        } else {
1316            unwrapped_text.to_string()
1317        }
1318    }
1319
1320    impl WrapSnapshot {
1321        pub fn text(&self) -> String {
1322            self.text_chunks(0).collect()
1323        }
1324
1325        pub fn text_chunks(&self, wrap_row: u32) -> impl Iterator<Item = &str> {
1326            self.chunks(
1327                wrap_row..self.max_point().row() + 1,
1328                false,
1329                None,
1330                None,
1331                None,
1332                None,
1333            )
1334            .map(|h| h.text)
1335        }
1336
1337        fn verify_chunks(&mut self, rng: &mut impl Rng) {
1338            for _ in 0..5 {
1339                let mut end_row = rng.gen_range(0..=self.max_point().row());
1340                let start_row = rng.gen_range(0..=end_row);
1341                end_row += 1;
1342
1343                let mut expected_text = self.text_chunks(start_row).collect::<String>();
1344                if expected_text.ends_with('\n') {
1345                    expected_text.push('\n');
1346                }
1347                let mut expected_text = expected_text
1348                    .lines()
1349                    .take((end_row - start_row) as usize)
1350                    .collect::<Vec<_>>()
1351                    .join("\n");
1352                if end_row <= self.max_point().row() {
1353                    expected_text.push('\n');
1354                }
1355
1356                let actual_text = self
1357                    .chunks(start_row..end_row, true, None, None, None, None)
1358                    .map(|c| c.text)
1359                    .collect::<String>();
1360                assert_eq!(
1361                    expected_text,
1362                    actual_text,
1363                    "chunks != highlighted_chunks for rows {:?}",
1364                    start_row..end_row
1365                );
1366            }
1367        }
1368    }
1369}