1use super::{
   2    inlay_map::InlayBufferRows,
   3    tab_map::{self, TabEdit, TabPoint, TabSnapshot},
   4    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: InlayBufferRows<'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                );
 450                let mut edit_transforms = Vec::<Transform>::new();
 451                for _ in edit.new_rows.start..edit.new_rows.end {
 452                    while let Some(chunk) =
 453                        remaining.take().or_else(|| chunks.next().map(|c| c.text))
 454                    {
 455                        if let Some(ix) = chunk.find('\n') {
 456                            line.push_str(&chunk[..ix + 1]);
 457                            remaining = Some(&chunk[ix + 1..]);
 458                            break;
 459                        } else {
 460                            line.push_str(chunk)
 461                        }
 462                    }
 463
 464                    if line.is_empty() {
 465                        break;
 466                    }
 467
 468                    let mut prev_boundary_ix = 0;
 469                    for boundary in line_wrapper.wrap_line(&line, wrap_width) {
 470                        let wrapped = &line[prev_boundary_ix..boundary.ix];
 471                        push_isomorphic(&mut edit_transforms, TextSummary::from(wrapped));
 472                        edit_transforms.push(Transform::wrap(boundary.next_indent));
 473                        prev_boundary_ix = boundary.ix;
 474                    }
 475
 476                    if prev_boundary_ix < line.len() {
 477                        push_isomorphic(
 478                            &mut edit_transforms,
 479                            TextSummary::from(&line[prev_boundary_ix..]),
 480                        );
 481                    }
 482
 483                    line.clear();
 484                    yield_now().await;
 485                }
 486
 487                let mut edit_transforms = edit_transforms.into_iter();
 488                if let Some(transform) = edit_transforms.next() {
 489                    new_transforms.push_or_extend(transform);
 490                }
 491                new_transforms.extend(edit_transforms, &());
 492
 493                old_cursor.seek_forward(&TabPoint::new(edit.old_rows.end, 0), Bias::Right, &());
 494                if let Some(next_edit) = row_edits.peek() {
 495                    if next_edit.old_rows.start > old_cursor.end(&()).row() {
 496                        if old_cursor.end(&()) > TabPoint::new(edit.old_rows.end, 0) {
 497                            let summary = self.tab_snapshot.text_summary_for_range(
 498                                TabPoint::new(edit.old_rows.end, 0)..old_cursor.end(&()),
 499                            );
 500                            new_transforms.push_or_extend(Transform::isomorphic(summary));
 501                        }
 502                        old_cursor.next(&());
 503                        new_transforms.append(
 504                            old_cursor.slice(
 505                                &TabPoint::new(next_edit.old_rows.start, 0),
 506                                Bias::Right,
 507                                &(),
 508                            ),
 509                            &(),
 510                        );
 511                    }
 512                } else {
 513                    if old_cursor.end(&()) > TabPoint::new(edit.old_rows.end, 0) {
 514                        let summary = self.tab_snapshot.text_summary_for_range(
 515                            TabPoint::new(edit.old_rows.end, 0)..old_cursor.end(&()),
 516                        );
 517                        new_transforms.push_or_extend(Transform::isomorphic(summary));
 518                    }
 519                    old_cursor.next(&());
 520                    new_transforms.append(old_cursor.suffix(&()), &());
 521                }
 522            }
 523        }
 524
 525        let old_snapshot = mem::replace(
 526            self,
 527            WrapSnapshot {
 528                tab_snapshot: new_tab_snapshot,
 529                transforms: new_transforms,
 530                interpolated: false,
 531            },
 532        );
 533        self.check_invariants();
 534        old_snapshot.compute_edits(tab_edits, self)
 535    }
 536
 537    fn compute_edits(&self, tab_edits: &[TabEdit], new_snapshot: &WrapSnapshot) -> Patch<u32> {
 538        let mut wrap_edits = Vec::new();
 539        let mut old_cursor = self.transforms.cursor::<TransformSummary>();
 540        let mut new_cursor = new_snapshot.transforms.cursor::<TransformSummary>();
 541        for mut tab_edit in tab_edits.iter().cloned() {
 542            tab_edit.old.start.0.column = 0;
 543            tab_edit.old.end.0 += Point::new(1, 0);
 544            tab_edit.new.start.0.column = 0;
 545            tab_edit.new.end.0 += Point::new(1, 0);
 546
 547            old_cursor.seek(&tab_edit.old.start, Bias::Right, &());
 548            let mut old_start = old_cursor.start().output.lines;
 549            old_start += tab_edit.old.start.0 - old_cursor.start().input.lines;
 550
 551            old_cursor.seek(&tab_edit.old.end, Bias::Right, &());
 552            let mut old_end = old_cursor.start().output.lines;
 553            old_end += tab_edit.old.end.0 - old_cursor.start().input.lines;
 554
 555            new_cursor.seek(&tab_edit.new.start, Bias::Right, &());
 556            let mut new_start = new_cursor.start().output.lines;
 557            new_start += tab_edit.new.start.0 - new_cursor.start().input.lines;
 558
 559            new_cursor.seek(&tab_edit.new.end, Bias::Right, &());
 560            let mut new_end = new_cursor.start().output.lines;
 561            new_end += tab_edit.new.end.0 - new_cursor.start().input.lines;
 562
 563            wrap_edits.push(WrapEdit {
 564                old: old_start.row..old_end.row,
 565                new: new_start.row..new_end.row,
 566            });
 567        }
 568
 569        consolidate_wrap_edits(&mut wrap_edits);
 570        Patch::new(wrap_edits)
 571    }
 572
 573    pub fn chunks<'a>(
 574        &'a self,
 575        rows: Range<u32>,
 576        language_aware: bool,
 577        text_highlights: Option<&'a TextHighlights>,
 578        suggestion_highlight: Option<HighlightStyle>,
 579    ) -> WrapChunks<'a> {
 580        let output_start = WrapPoint::new(rows.start, 0);
 581        let output_end = WrapPoint::new(rows.end, 0);
 582        let mut transforms = self.transforms.cursor::<(WrapPoint, TabPoint)>();
 583        transforms.seek(&output_start, Bias::Right, &());
 584        let mut input_start = TabPoint(transforms.start().1 .0);
 585        if transforms.item().map_or(false, |t| t.is_isomorphic()) {
 586            input_start.0 += output_start.0 - transforms.start().0 .0;
 587        }
 588        let input_end = self
 589            .to_tab_point(output_end)
 590            .min(self.tab_snapshot.max_point());
 591        WrapChunks {
 592            input_chunks: self.tab_snapshot.chunks(
 593                input_start..input_end,
 594                language_aware,
 595                text_highlights,
 596                suggestion_highlight,
 597            ),
 598            input_chunk: Default::default(),
 599            output_position: output_start,
 600            max_output_row: rows.end,
 601            transforms,
 602        }
 603    }
 604
 605    pub fn max_point(&self) -> WrapPoint {
 606        WrapPoint(self.transforms.summary().output.lines)
 607    }
 608
 609    pub fn line_len(&self, row: u32) -> u32 {
 610        let mut cursor = self.transforms.cursor::<(WrapPoint, TabPoint)>();
 611        cursor.seek(&WrapPoint::new(row + 1, 0), Bias::Left, &());
 612        if cursor
 613            .item()
 614            .map_or(false, |transform| transform.is_isomorphic())
 615        {
 616            let overshoot = row - cursor.start().0.row();
 617            let tab_row = cursor.start().1.row() + overshoot;
 618            let tab_line_len = self.tab_snapshot.line_len(tab_row);
 619            if overshoot == 0 {
 620                cursor.start().0.column() + (tab_line_len - cursor.start().1.column())
 621            } else {
 622                tab_line_len
 623            }
 624        } else {
 625            cursor.start().0.column()
 626        }
 627    }
 628
 629    pub fn soft_wrap_indent(&self, row: u32) -> Option<u32> {
 630        let mut cursor = self.transforms.cursor::<WrapPoint>();
 631        cursor.seek(&WrapPoint::new(row + 1, 0), Bias::Right, &());
 632        cursor.item().and_then(|transform| {
 633            if transform.is_isomorphic() {
 634                None
 635            } else {
 636                Some(transform.summary.output.lines.column)
 637            }
 638        })
 639    }
 640
 641    pub fn longest_row(&self) -> u32 {
 642        self.transforms.summary().output.longest_row
 643    }
 644
 645    pub fn buffer_rows(&self, start_row: u32) -> WrapBufferRows {
 646        let mut transforms = self.transforms.cursor::<(WrapPoint, TabPoint)>();
 647        transforms.seek(&WrapPoint::new(start_row, 0), Bias::Left, &());
 648        let mut input_row = transforms.start().1.row();
 649        if transforms.item().map_or(false, |t| t.is_isomorphic()) {
 650            input_row += start_row - transforms.start().0.row();
 651        }
 652        let soft_wrapped = transforms.item().map_or(false, |t| !t.is_isomorphic());
 653        let mut input_buffer_rows = self.tab_snapshot.buffer_rows(input_row);
 654        let input_buffer_row = input_buffer_rows.next().unwrap();
 655        WrapBufferRows {
 656            transforms,
 657            input_buffer_row,
 658            input_buffer_rows,
 659            output_row: start_row,
 660            soft_wrapped,
 661            max_output_row: self.max_point().row(),
 662        }
 663    }
 664
 665    pub fn to_tab_point(&self, point: WrapPoint) -> TabPoint {
 666        let mut cursor = self.transforms.cursor::<(WrapPoint, TabPoint)>();
 667        cursor.seek(&point, Bias::Right, &());
 668        let mut tab_point = cursor.start().1 .0;
 669        if cursor.item().map_or(false, |t| t.is_isomorphic()) {
 670            tab_point += point.0 - cursor.start().0 .0;
 671        }
 672        TabPoint(tab_point)
 673    }
 674
 675    pub fn to_point(&self, point: WrapPoint, bias: Bias) -> Point {
 676        self.tab_snapshot.to_point(self.to_tab_point(point), bias)
 677    }
 678
 679    pub fn make_wrap_point(&self, point: Point, bias: Bias) -> WrapPoint {
 680        self.tab_point_to_wrap_point(self.tab_snapshot.make_tab_point(point, bias))
 681    }
 682
 683    pub fn tab_point_to_wrap_point(&self, point: TabPoint) -> WrapPoint {
 684        let mut cursor = self.transforms.cursor::<(TabPoint, WrapPoint)>();
 685        cursor.seek(&point, Bias::Right, &());
 686        WrapPoint(cursor.start().1 .0 + (point.0 - cursor.start().0 .0))
 687    }
 688
 689    pub fn clip_point(&self, mut point: WrapPoint, bias: Bias) -> WrapPoint {
 690        if bias == Bias::Left {
 691            let mut cursor = self.transforms.cursor::<WrapPoint>();
 692            cursor.seek(&point, Bias::Right, &());
 693            if cursor.item().map_or(false, |t| !t.is_isomorphic()) {
 694                point = *cursor.start();
 695                *point.column_mut() -= 1;
 696            }
 697        }
 698
 699        self.tab_point_to_wrap_point(self.tab_snapshot.clip_point(self.to_tab_point(point), bias))
 700    }
 701
 702    pub fn prev_row_boundary(&self, mut point: WrapPoint) -> u32 {
 703        if self.transforms.is_empty() {
 704            return 0;
 705        }
 706
 707        *point.column_mut() = 0;
 708
 709        let mut cursor = self.transforms.cursor::<(WrapPoint, TabPoint)>();
 710        cursor.seek(&point, Bias::Right, &());
 711        if cursor.item().is_none() {
 712            cursor.prev(&());
 713        }
 714
 715        while let Some(transform) = cursor.item() {
 716            if transform.is_isomorphic() && cursor.start().1.column() == 0 {
 717                return cmp::min(cursor.end(&()).0.row(), point.row());
 718            } else {
 719                cursor.prev(&());
 720            }
 721        }
 722
 723        unreachable!()
 724    }
 725
 726    pub fn next_row_boundary(&self, mut point: WrapPoint) -> Option<u32> {
 727        point.0 += Point::new(1, 0);
 728
 729        let mut cursor = self.transforms.cursor::<(WrapPoint, TabPoint)>();
 730        cursor.seek(&point, Bias::Right, &());
 731        while let Some(transform) = cursor.item() {
 732            if transform.is_isomorphic() && cursor.start().1.column() == 0 {
 733                return Some(cmp::max(cursor.start().0.row(), point.row()));
 734            } else {
 735                cursor.next(&());
 736            }
 737        }
 738
 739        None
 740    }
 741
 742    fn check_invariants(&self) {
 743        #[cfg(test)]
 744        {
 745            assert_eq!(
 746                TabPoint::from(self.transforms.summary().input.lines),
 747                self.tab_snapshot.max_point()
 748            );
 749
 750            {
 751                let mut transforms = self.transforms.cursor::<()>().peekable();
 752                while let Some(transform) = transforms.next() {
 753                    if let Some(next_transform) = transforms.peek() {
 754                        assert!(transform.is_isomorphic() != next_transform.is_isomorphic());
 755                    }
 756                }
 757            }
 758
 759            let text = language::Rope::from(self.text().as_str());
 760            let input_buffer_rows = self.buffer_snapshot().buffer_rows(0).collect::<Vec<_>>();
 761            let mut expected_buffer_rows = Vec::new();
 762            let mut prev_fold_row = 0;
 763            for display_row in 0..=self.max_point().row() {
 764                let tab_point = self.to_tab_point(WrapPoint::new(display_row, 0));
 765                let inlay_point = self.tab_snapshot.to_inlay_point(tab_point, Bias::Left).0;
 766                let fold_point = self.tab_snapshot.inlay_snapshot.to_fold_point(inlay_point);
 767                if fold_point.row() == prev_fold_row && display_row != 0 {
 768                    expected_buffer_rows.push(None);
 769                } else {
 770                    let buffer_point =
 771                        fold_point.to_buffer_point(&self.tab_snapshot.inlay_snapshot.fold_snapshot);
 772                    expected_buffer_rows.push(input_buffer_rows[buffer_point.row as usize]);
 773                    prev_fold_row = fold_point.row();
 774                }
 775
 776                assert_eq!(self.line_len(display_row), text.line_len(display_row));
 777            }
 778
 779            for start_display_row in 0..expected_buffer_rows.len() {
 780                assert_eq!(
 781                    self.buffer_rows(start_display_row as u32)
 782                        .collect::<Vec<_>>(),
 783                    &expected_buffer_rows[start_display_row..],
 784                    "invalid buffer_rows({}..)",
 785                    start_display_row
 786                );
 787            }
 788        }
 789    }
 790}
 791
 792impl<'a> Iterator for WrapChunks<'a> {
 793    type Item = Chunk<'a>;
 794
 795    fn next(&mut self) -> Option<Self::Item> {
 796        if self.output_position.row() >= self.max_output_row {
 797            return None;
 798        }
 799
 800        let transform = self.transforms.item()?;
 801        if let Some(display_text) = transform.display_text {
 802            let mut start_ix = 0;
 803            let mut end_ix = display_text.len();
 804            let mut summary = transform.summary.output.lines;
 805
 806            if self.output_position > self.transforms.start().0 {
 807                // Exclude newline starting prior to the desired row.
 808                start_ix = 1;
 809                summary.row = 0;
 810            } else if self.output_position.row() + 1 >= self.max_output_row {
 811                // Exclude soft indentation ending after the desired row.
 812                end_ix = 1;
 813                summary.column = 0;
 814            }
 815
 816            self.output_position.0 += summary;
 817            self.transforms.next(&());
 818            return Some(Chunk {
 819                text: &display_text[start_ix..end_ix],
 820                ..self.input_chunk
 821            });
 822        }
 823
 824        if self.input_chunk.text.is_empty() {
 825            self.input_chunk = self.input_chunks.next().unwrap();
 826        }
 827
 828        let mut input_len = 0;
 829        let transform_end = self.transforms.end(&()).0;
 830        for c in self.input_chunk.text.chars() {
 831            let char_len = c.len_utf8();
 832            input_len += char_len;
 833            if c == '\n' {
 834                *self.output_position.row_mut() += 1;
 835                *self.output_position.column_mut() = 0;
 836            } else {
 837                *self.output_position.column_mut() += char_len as u32;
 838            }
 839
 840            if self.output_position >= transform_end {
 841                self.transforms.next(&());
 842                break;
 843            }
 844        }
 845
 846        let (prefix, suffix) = self.input_chunk.text.split_at(input_len);
 847        self.input_chunk.text = suffix;
 848        Some(Chunk {
 849            text: prefix,
 850            ..self.input_chunk
 851        })
 852    }
 853}
 854
 855impl<'a> Iterator for WrapBufferRows<'a> {
 856    type Item = Option<u32>;
 857
 858    fn next(&mut self) -> Option<Self::Item> {
 859        if self.output_row > self.max_output_row {
 860            return None;
 861        }
 862
 863        let buffer_row = self.input_buffer_row;
 864        let soft_wrapped = self.soft_wrapped;
 865
 866        self.output_row += 1;
 867        self.transforms
 868            .seek_forward(&WrapPoint::new(self.output_row, 0), Bias::Left, &());
 869        if self.transforms.item().map_or(false, |t| t.is_isomorphic()) {
 870            self.input_buffer_row = self.input_buffer_rows.next().unwrap();
 871            self.soft_wrapped = false;
 872        } else {
 873            self.soft_wrapped = true;
 874        }
 875
 876        Some(if soft_wrapped { None } else { buffer_row })
 877    }
 878}
 879
 880impl Transform {
 881    fn isomorphic(summary: TextSummary) -> Self {
 882        #[cfg(test)]
 883        assert!(!summary.lines.is_zero());
 884
 885        Self {
 886            summary: TransformSummary {
 887                input: summary.clone(),
 888                output: summary,
 889            },
 890            display_text: None,
 891        }
 892    }
 893
 894    fn wrap(indent: u32) -> Self {
 895        lazy_static! {
 896            static ref WRAP_TEXT: String = {
 897                let mut wrap_text = String::new();
 898                wrap_text.push('\n');
 899                wrap_text.extend((0..LineWrapper::MAX_INDENT as usize).map(|_| ' '));
 900                wrap_text
 901            };
 902        }
 903
 904        Self {
 905            summary: TransformSummary {
 906                input: TextSummary::default(),
 907                output: TextSummary {
 908                    lines: Point::new(1, indent),
 909                    first_line_chars: 0,
 910                    last_line_chars: indent,
 911                    longest_row: 1,
 912                    longest_row_chars: indent,
 913                },
 914            },
 915            display_text: Some(&WRAP_TEXT[..1 + indent as usize]),
 916        }
 917    }
 918
 919    fn is_isomorphic(&self) -> bool {
 920        self.display_text.is_none()
 921    }
 922}
 923
 924impl sum_tree::Item for Transform {
 925    type Summary = TransformSummary;
 926
 927    fn summary(&self) -> Self::Summary {
 928        self.summary.clone()
 929    }
 930}
 931
 932fn push_isomorphic(transforms: &mut Vec<Transform>, summary: TextSummary) {
 933    if let Some(last_transform) = transforms.last_mut() {
 934        if last_transform.is_isomorphic() {
 935            last_transform.summary.input += &summary;
 936            last_transform.summary.output += &summary;
 937            return;
 938        }
 939    }
 940    transforms.push(Transform::isomorphic(summary));
 941}
 942
 943trait SumTreeExt {
 944    fn push_or_extend(&mut self, transform: Transform);
 945}
 946
 947impl SumTreeExt for SumTree<Transform> {
 948    fn push_or_extend(&mut self, transform: Transform) {
 949        let mut transform = Some(transform);
 950        self.update_last(
 951            |last_transform| {
 952                if last_transform.is_isomorphic() && transform.as_ref().unwrap().is_isomorphic() {
 953                    let transform = transform.take().unwrap();
 954                    last_transform.summary.input += &transform.summary.input;
 955                    last_transform.summary.output += &transform.summary.output;
 956                }
 957            },
 958            &(),
 959        );
 960
 961        if let Some(transform) = transform {
 962            self.push(transform, &());
 963        }
 964    }
 965}
 966
 967impl WrapPoint {
 968    pub fn new(row: u32, column: u32) -> Self {
 969        Self(Point::new(row, column))
 970    }
 971
 972    pub fn row(self) -> u32 {
 973        self.0.row
 974    }
 975
 976    pub fn row_mut(&mut self) -> &mut u32 {
 977        &mut self.0.row
 978    }
 979
 980    pub fn column(self) -> u32 {
 981        self.0.column
 982    }
 983
 984    pub fn column_mut(&mut self) -> &mut u32 {
 985        &mut self.0.column
 986    }
 987}
 988
 989impl sum_tree::Summary for TransformSummary {
 990    type Context = ();
 991
 992    fn add_summary(&mut self, other: &Self, _: &()) {
 993        self.input += &other.input;
 994        self.output += &other.output;
 995    }
 996}
 997
 998impl<'a> sum_tree::Dimension<'a, TransformSummary> for TabPoint {
 999    fn add_summary(&mut self, summary: &'a TransformSummary, _: &()) {
1000        self.0 += summary.input.lines;
1001    }
1002}
1003
1004impl<'a> sum_tree::SeekTarget<'a, TransformSummary, TransformSummary> for TabPoint {
1005    fn cmp(&self, cursor_location: &TransformSummary, _: &()) -> std::cmp::Ordering {
1006        Ord::cmp(&self.0, &cursor_location.input.lines)
1007    }
1008}
1009
1010impl<'a> sum_tree::Dimension<'a, TransformSummary> for WrapPoint {
1011    fn add_summary(&mut self, summary: &'a TransformSummary, _: &()) {
1012        self.0 += summary.output.lines;
1013    }
1014}
1015
1016fn consolidate_wrap_edits(edits: &mut Vec<WrapEdit>) {
1017    let mut i = 1;
1018    while i < edits.len() {
1019        let edit = edits[i].clone();
1020        let prev_edit = &mut edits[i - 1];
1021        if prev_edit.old.end >= edit.old.start {
1022            prev_edit.old.end = edit.old.end;
1023            prev_edit.new.end = edit.new.end;
1024            edits.remove(i);
1025            continue;
1026        }
1027        i += 1;
1028    }
1029}
1030
1031#[cfg(test)]
1032mod tests {
1033    use super::*;
1034    use crate::{
1035        display_map::{fold_map::FoldMap, inlay_map::InlayMap, tab_map::TabMap},
1036        MultiBuffer,
1037    };
1038    use gpui::test::observe;
1039    use rand::prelude::*;
1040    use settings::SettingsStore;
1041    use smol::stream::StreamExt;
1042    use std::{cmp, env, num::NonZeroU32};
1043    use text::Rope;
1044
1045    #[gpui::test(iterations = 100)]
1046    async fn test_random_wraps(cx: &mut gpui::TestAppContext, mut rng: StdRng) {
1047        init_test(cx);
1048
1049        cx.foreground().set_block_on_ticks(0..=50);
1050        let operations = env::var("OPERATIONS")
1051            .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
1052            .unwrap_or(10);
1053
1054        let font_cache = cx.font_cache().clone();
1055        let font_system = cx.platform().fonts();
1056        let mut wrap_width = if rng.gen_bool(0.1) {
1057            None
1058        } else {
1059            Some(rng.gen_range(0.0..=1000.0))
1060        };
1061        let tab_size = NonZeroU32::new(rng.gen_range(1..=4)).unwrap();
1062        let family_id = font_cache
1063            .load_family(&["Helvetica"], &Default::default())
1064            .unwrap();
1065        let font_id = font_cache
1066            .select_font(family_id, &Default::default())
1067            .unwrap();
1068        let font_size = 14.0;
1069
1070        log::info!("Tab size: {}", tab_size);
1071        log::info!("Wrap width: {:?}", wrap_width);
1072
1073        let buffer = cx.update(|cx| {
1074            if rng.gen() {
1075                MultiBuffer::build_random(&mut rng, cx)
1076            } else {
1077                let len = rng.gen_range(0..10);
1078                let text = util::RandomCharIter::new(&mut rng)
1079                    .take(len)
1080                    .collect::<String>();
1081                MultiBuffer::build_simple(&text, cx)
1082            }
1083        });
1084        let mut buffer_snapshot = buffer.read_with(cx, |buffer, cx| buffer.snapshot(cx));
1085        log::info!("Buffer text: {:?}", buffer_snapshot.text());
1086        let (mut fold_map, fold_snapshot) = FoldMap::new(buffer_snapshot.clone());
1087        log::info!("FoldMap text: {:?}", fold_snapshot.text());
1088        let (mut inlay_map, inlay_snapshot) = InlayMap::new(fold_snapshot.clone());
1089        log::info!("InlaysMap text: {:?}", inlay_snapshot.text());
1090        let (tab_map, _) = TabMap::new(inlay_snapshot.clone(), tab_size);
1091        let tabs_snapshot = tab_map.set_max_expansion_column(32);
1092        log::info!("TabMap text: {:?}", tabs_snapshot.text());
1093
1094        let mut line_wrapper = LineWrapper::new(font_id, font_size, font_system);
1095        let unwrapped_text = tabs_snapshot.text();
1096        let expected_text = wrap_text(&unwrapped_text, wrap_width, &mut line_wrapper);
1097
1098        let (wrap_map, _) =
1099            cx.update(|cx| WrapMap::new(tabs_snapshot.clone(), font_id, font_size, wrap_width, cx));
1100        let mut notifications = observe(&wrap_map, cx);
1101
1102        if wrap_map.read_with(cx, |map, _| map.is_rewrapping()) {
1103            notifications.next().await.unwrap();
1104        }
1105
1106        let (initial_snapshot, _) = wrap_map.update(cx, |map, cx| {
1107            assert!(!map.is_rewrapping());
1108            map.sync(tabs_snapshot.clone(), Vec::new(), cx)
1109        });
1110
1111        let actual_text = initial_snapshot.text();
1112        assert_eq!(
1113            actual_text, expected_text,
1114            "unwrapped text is: {:?}",
1115            unwrapped_text
1116        );
1117        log::info!("Wrapped text: {:?}", actual_text);
1118
1119        let mut next_inlay_id = 0;
1120        let mut edits = Vec::new();
1121        for _i in 0..operations {
1122            log::info!("{} ==============================================", _i);
1123
1124            let mut buffer_edits = Vec::new();
1125            match rng.gen_range(0..=100) {
1126                0..=19 => {
1127                    wrap_width = if rng.gen_bool(0.2) {
1128                        None
1129                    } else {
1130                        Some(rng.gen_range(0.0..=1000.0))
1131                    };
1132                    log::info!("Setting wrap width to {:?}", wrap_width);
1133                    wrap_map.update(cx, |map, cx| map.set_wrap_width(wrap_width, cx));
1134                }
1135                20..=39 => {
1136                    for (fold_snapshot, fold_edits) in fold_map.randomly_mutate(&mut rng) {
1137                        let (inlay_snapshot, inlay_edits) =
1138                            inlay_map.sync(fold_snapshot, fold_edits);
1139                        let (tabs_snapshot, tab_edits) =
1140                            tab_map.sync(inlay_snapshot, inlay_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 (tabs_snapshot, tab_edits) =
1152                        tab_map.sync(inlay_snapshot, inlay_edits, tab_size);
1153                    let (mut snapshot, wrap_edits) =
1154                        wrap_map.update(cx, |map, cx| map.sync(tabs_snapshot, tab_edits, cx));
1155                    snapshot.check_invariants();
1156                    snapshot.verify_chunks(&mut rng);
1157                    edits.push((snapshot, wrap_edits));
1158                }
1159                _ => {
1160                    buffer.update(cx, |buffer, cx| {
1161                        let subscription = buffer.subscribe();
1162                        let edit_count = rng.gen_range(1..=5);
1163                        buffer.randomly_mutate(&mut rng, edit_count, cx);
1164                        buffer_snapshot = buffer.snapshot(cx);
1165                        buffer_edits.extend(subscription.consume());
1166                    });
1167                }
1168            }
1169
1170            log::info!("Buffer text: {:?}", buffer_snapshot.text());
1171            let (fold_snapshot, fold_edits) = fold_map.read(buffer_snapshot.clone(), buffer_edits);
1172            log::info!("FoldMap text: {:?}", fold_snapshot.text());
1173            let (inlay_snapshot, inlay_edits) = inlay_map.sync(fold_snapshot, fold_edits);
1174            log::info!("InlayMap text: {:?}", inlay_snapshot.text());
1175            let (tabs_snapshot, tab_edits) = tab_map.sync(inlay_snapshot, inlay_edits, tab_size);
1176            log::info!("TabMap text: {:?}", tabs_snapshot.text());
1177
1178            let unwrapped_text = tabs_snapshot.text();
1179            let expected_text = wrap_text(&unwrapped_text, wrap_width, &mut line_wrapper);
1180            let (mut snapshot, wrap_edits) =
1181                wrap_map.update(cx, |map, cx| map.sync(tabs_snapshot.clone(), tab_edits, cx));
1182            snapshot.check_invariants();
1183            snapshot.verify_chunks(&mut rng);
1184            edits.push((snapshot, wrap_edits));
1185
1186            if wrap_map.read_with(cx, |map, _| map.is_rewrapping()) && rng.gen_bool(0.4) {
1187                log::info!("Waiting for wrapping to finish");
1188                while wrap_map.read_with(cx, |map, _| map.is_rewrapping()) {
1189                    notifications.next().await.unwrap();
1190                }
1191                wrap_map.read_with(cx, |map, _| assert!(map.pending_edits.is_empty()));
1192            }
1193
1194            if !wrap_map.read_with(cx, |map, _| map.is_rewrapping()) {
1195                let (mut wrapped_snapshot, wrap_edits) =
1196                    wrap_map.update(cx, |map, cx| map.sync(tabs_snapshot, Vec::new(), cx));
1197                let actual_text = wrapped_snapshot.text();
1198                let actual_longest_row = wrapped_snapshot.longest_row();
1199                log::info!("Wrapping finished: {:?}", actual_text);
1200                wrapped_snapshot.check_invariants();
1201                wrapped_snapshot.verify_chunks(&mut rng);
1202                edits.push((wrapped_snapshot.clone(), wrap_edits));
1203                assert_eq!(
1204                    actual_text, expected_text,
1205                    "unwrapped text is: {:?}",
1206                    unwrapped_text
1207                );
1208
1209                let mut summary = TextSummary::default();
1210                for (ix, item) in wrapped_snapshot
1211                    .transforms
1212                    .items(&())
1213                    .into_iter()
1214                    .enumerate()
1215                {
1216                    summary += &item.summary.output;
1217                    log::info!("{} summary: {:?}", ix, item.summary.output,);
1218                }
1219
1220                if tab_size.get() == 1
1221                    || !wrapped_snapshot
1222                        .tab_snapshot
1223                        .inlay_snapshot
1224                        .text()
1225                        .contains('\t')
1226                {
1227                    let mut expected_longest_rows = Vec::new();
1228                    let mut longest_line_len = -1;
1229                    for (row, line) in expected_text.split('\n').enumerate() {
1230                        let line_char_count = line.chars().count() as isize;
1231                        if line_char_count > longest_line_len {
1232                            expected_longest_rows.clear();
1233                            longest_line_len = line_char_count;
1234                        }
1235                        if line_char_count >= longest_line_len {
1236                            expected_longest_rows.push(row as u32);
1237                        }
1238                    }
1239
1240                    assert!(
1241                        expected_longest_rows.contains(&actual_longest_row),
1242                        "incorrect longest row {}. expected {:?} with length {}",
1243                        actual_longest_row,
1244                        expected_longest_rows,
1245                        longest_line_len,
1246                    )
1247                }
1248            }
1249        }
1250
1251        let mut initial_text = Rope::from(initial_snapshot.text().as_str());
1252        for (snapshot, patch) in edits {
1253            let snapshot_text = Rope::from(snapshot.text().as_str());
1254            for edit in &patch {
1255                let old_start = initial_text.point_to_offset(Point::new(edit.new.start, 0));
1256                let old_end = initial_text.point_to_offset(cmp::min(
1257                    Point::new(edit.new.start + edit.old.len() as u32, 0),
1258                    initial_text.max_point(),
1259                ));
1260                let new_start = snapshot_text.point_to_offset(Point::new(edit.new.start, 0));
1261                let new_end = snapshot_text.point_to_offset(cmp::min(
1262                    Point::new(edit.new.end, 0),
1263                    snapshot_text.max_point(),
1264                ));
1265                let new_text = snapshot_text
1266                    .chunks_in_range(new_start..new_end)
1267                    .collect::<String>();
1268
1269                initial_text.replace(old_start..old_end, &new_text);
1270            }
1271            assert_eq!(initial_text.to_string(), snapshot_text.to_string());
1272        }
1273
1274        if wrap_map.read_with(cx, |map, _| map.is_rewrapping()) {
1275            log::info!("Waiting for wrapping to finish");
1276            while wrap_map.read_with(cx, |map, _| map.is_rewrapping()) {
1277                notifications.next().await.unwrap();
1278            }
1279        }
1280        wrap_map.read_with(cx, |map, _| assert!(map.pending_edits.is_empty()));
1281    }
1282
1283    fn init_test(cx: &mut gpui::TestAppContext) {
1284        cx.foreground().forbid_parking();
1285        cx.update(|cx| {
1286            cx.set_global(SettingsStore::test(cx));
1287            theme::init((), cx);
1288        });
1289    }
1290
1291    fn wrap_text(
1292        unwrapped_text: &str,
1293        wrap_width: Option<f32>,
1294        line_wrapper: &mut LineWrapper,
1295    ) -> String {
1296        if let Some(wrap_width) = wrap_width {
1297            let mut wrapped_text = String::new();
1298            for (row, line) in unwrapped_text.split('\n').enumerate() {
1299                if row > 0 {
1300                    wrapped_text.push('\n')
1301                }
1302
1303                let mut prev_ix = 0;
1304                for boundary in line_wrapper.wrap_line(line, wrap_width) {
1305                    wrapped_text.push_str(&line[prev_ix..boundary.ix]);
1306                    wrapped_text.push('\n');
1307                    wrapped_text.push_str(&" ".repeat(boundary.next_indent as usize));
1308                    prev_ix = boundary.ix;
1309                }
1310                wrapped_text.push_str(&line[prev_ix..]);
1311            }
1312            wrapped_text
1313        } else {
1314            unwrapped_text.to_string()
1315        }
1316    }
1317
1318    impl WrapSnapshot {
1319        pub fn text(&self) -> String {
1320            self.text_chunks(0).collect()
1321        }
1322
1323        pub fn text_chunks(&self, wrap_row: u32) -> impl Iterator<Item = &str> {
1324            self.chunks(wrap_row..self.max_point().row() + 1, false, None, None)
1325                .map(|h| h.text)
1326        }
1327
1328        fn verify_chunks(&mut self, rng: &mut impl Rng) {
1329            for _ in 0..5 {
1330                let mut end_row = rng.gen_range(0..=self.max_point().row());
1331                let start_row = rng.gen_range(0..=end_row);
1332                end_row += 1;
1333
1334                let mut expected_text = self.text_chunks(start_row).collect::<String>();
1335                if expected_text.ends_with('\n') {
1336                    expected_text.push('\n');
1337                }
1338                let mut expected_text = expected_text
1339                    .lines()
1340                    .take((end_row - start_row) as usize)
1341                    .collect::<Vec<_>>()
1342                    .join("\n");
1343                if end_row <= self.max_point().row() {
1344                    expected_text.push('\n');
1345                }
1346
1347                let actual_text = self
1348                    .chunks(start_row..end_row, true, None, None)
1349                    .map(|c| c.text)
1350                    .collect::<String>();
1351                assert_eq!(
1352                    expected_text,
1353                    actual_text,
1354                    "chunks != highlighted_chunks for rows {:?}",
1355                    start_row..end_row
1356                );
1357            }
1358        }
1359    }
1360}