1use super::{
   2    Highlights,
   3    fold_map::{Chunk, FoldRows},
   4    tab_map::{self, TabEdit, TabPoint, TabSnapshot},
   5};
   6use gpui::{App, AppContext as _, Context, Entity, Font, LineWrapper, Pixels, Task};
   7use language::Point;
   8use multi_buffer::{MultiBufferSnapshot, RowInfo};
   9use smol::future::yield_now;
  10use std::sync::LazyLock;
  11use std::{cmp, collections::VecDeque, mem, ops::Range, time::Duration};
  12use sum_tree::{Bias, Cursor, SumTree};
  13use text::Patch;
  14
  15pub use super::tab_map::TextSummary;
  16pub type WrapEdit = text::Edit<u32>;
  17
  18/// Handles soft wrapping of text.
  19///
  20/// See the [`display_map` module documentation](crate::display_map) for more information.
  21pub struct WrapMap {
  22    snapshot: WrapSnapshot,
  23    pending_edits: VecDeque<(TabSnapshot, Vec<TabEdit>)>,
  24    interpolated_edits: Patch<u32>,
  25    edits_since_sync: Patch<u32>,
  26    wrap_width: Option<Pixels>,
  27    background_task: Option<Task<()>>,
  28    font_with_size: (Font, Pixels),
  29}
  30
  31#[derive(Clone)]
  32pub struct WrapSnapshot {
  33    tab_snapshot: TabSnapshot,
  34    transforms: SumTree<Transform>,
  35    interpolated: bool,
  36}
  37
  38#[derive(Clone, Debug, Default, Eq, PartialEq)]
  39struct Transform {
  40    summary: TransformSummary,
  41    display_text: Option<&'static str>,
  42}
  43
  44#[derive(Clone, Debug, Default, Eq, PartialEq)]
  45struct TransformSummary {
  46    input: TextSummary,
  47    output: TextSummary,
  48}
  49
  50#[derive(Copy, Clone, Debug, Default, Eq, Ord, PartialOrd, PartialEq)]
  51pub struct WrapPoint(pub Point);
  52
  53pub struct WrapChunks<'a> {
  54    input_chunks: tab_map::TabChunks<'a>,
  55    input_chunk: Chunk<'a>,
  56    output_position: WrapPoint,
  57    max_output_row: u32,
  58    transforms: Cursor<'a, Transform, (WrapPoint, TabPoint)>,
  59    snapshot: &'a WrapSnapshot,
  60}
  61
  62#[derive(Clone)]
  63pub struct WrapRows<'a> {
  64    input_buffer_rows: FoldRows<'a>,
  65    input_buffer_row: RowInfo,
  66    output_row: u32,
  67    soft_wrapped: bool,
  68    max_output_row: u32,
  69    transforms: Cursor<'a, Transform, (WrapPoint, TabPoint)>,
  70}
  71
  72impl WrapRows<'_> {
  73    pub(crate) fn seek(&mut self, start_row: u32) {
  74        self.transforms
  75            .seek(&WrapPoint::new(start_row, 0), Bias::Left, &());
  76        let mut input_row = self.transforms.start().1.row();
  77        if self.transforms.item().map_or(false, |t| t.is_isomorphic()) {
  78            input_row += start_row - self.transforms.start().0.row();
  79        }
  80        self.soft_wrapped = self.transforms.item().map_or(false, |t| !t.is_isomorphic());
  81        self.input_buffer_rows.seek(input_row);
  82        self.input_buffer_row = self.input_buffer_rows.next().unwrap();
  83        self.output_row = start_row;
  84    }
  85}
  86
  87impl WrapMap {
  88    pub fn new(
  89        tab_snapshot: TabSnapshot,
  90        font: Font,
  91        font_size: Pixels,
  92        wrap_width: Option<Pixels>,
  93        cx: &mut App,
  94    ) -> (Entity<Self>, WrapSnapshot) {
  95        let handle = cx.new(|cx| {
  96            let mut this = Self {
  97                font_with_size: (font, font_size),
  98                wrap_width: None,
  99                pending_edits: Default::default(),
 100                interpolated_edits: Default::default(),
 101                edits_since_sync: Default::default(),
 102                snapshot: WrapSnapshot::new(tab_snapshot),
 103                background_task: None,
 104            };
 105            this.set_wrap_width(wrap_width, cx);
 106            mem::take(&mut this.edits_since_sync);
 107            this
 108        });
 109        let snapshot = handle.read(cx).snapshot.clone();
 110        (handle, snapshot)
 111    }
 112
 113    #[cfg(test)]
 114    pub fn is_rewrapping(&self) -> bool {
 115        self.background_task.is_some()
 116    }
 117
 118    pub fn sync(
 119        &mut self,
 120        tab_snapshot: TabSnapshot,
 121        edits: Vec<TabEdit>,
 122        cx: &mut Context<Self>,
 123    ) -> (WrapSnapshot, Patch<u32>) {
 124        if self.wrap_width.is_some() {
 125            self.pending_edits.push_back((tab_snapshot, edits));
 126            self.flush_edits(cx);
 127        } else {
 128            self.edits_since_sync = self
 129                .edits_since_sync
 130                .compose(self.snapshot.interpolate(tab_snapshot, &edits));
 131            self.snapshot.interpolated = false;
 132        }
 133
 134        (self.snapshot.clone(), mem::take(&mut self.edits_since_sync))
 135    }
 136
 137    pub fn set_font_with_size(
 138        &mut self,
 139        font: Font,
 140        font_size: Pixels,
 141        cx: &mut Context<Self>,
 142    ) -> bool {
 143        let font_with_size = (font, font_size);
 144
 145        if font_with_size == self.font_with_size {
 146            false
 147        } else {
 148            self.font_with_size = font_with_size;
 149            self.rewrap(cx);
 150            true
 151        }
 152    }
 153
 154    pub fn set_wrap_width(&mut self, wrap_width: Option<Pixels>, cx: &mut Context<Self>) -> bool {
 155        if wrap_width == self.wrap_width {
 156            return false;
 157        }
 158
 159        self.wrap_width = wrap_width;
 160        self.rewrap(cx);
 161        true
 162    }
 163
 164    fn rewrap(&mut self, cx: &mut Context<Self>) {
 165        self.background_task.take();
 166        self.interpolated_edits.clear();
 167        self.pending_edits.clear();
 168
 169        if let Some(wrap_width) = self.wrap_width {
 170            let mut new_snapshot = self.snapshot.clone();
 171
 172            let text_system = cx.text_system().clone();
 173            let (font, font_size) = self.font_with_size.clone();
 174            let task = cx.background_spawn(async move {
 175                let mut line_wrapper = text_system.line_wrapper(font, font_size);
 176                let tab_snapshot = new_snapshot.tab_snapshot.clone();
 177                let range = TabPoint::zero()..tab_snapshot.max_point();
 178                let edits = new_snapshot
 179                    .update(
 180                        tab_snapshot,
 181                        &[TabEdit {
 182                            old: range.clone(),
 183                            new: range.clone(),
 184                        }],
 185                        wrap_width,
 186                        &mut line_wrapper,
 187                    )
 188                    .await;
 189                (new_snapshot, edits)
 190            });
 191
 192            match cx
 193                .background_executor()
 194                .block_with_timeout(Duration::from_millis(5), task)
 195            {
 196                Ok((snapshot, edits)) => {
 197                    self.snapshot = snapshot;
 198                    self.edits_since_sync = self.edits_since_sync.compose(&edits);
 199                }
 200                Err(wrap_task) => {
 201                    self.background_task = Some(cx.spawn(async move |this, cx| {
 202                        let (snapshot, edits) = wrap_task.await;
 203                        this.update(cx, |this, cx| {
 204                            this.snapshot = snapshot;
 205                            this.edits_since_sync = this
 206                                .edits_since_sync
 207                                .compose(mem::take(&mut this.interpolated_edits).invert())
 208                                .compose(&edits);
 209                            this.background_task = None;
 210                            this.flush_edits(cx);
 211                            cx.notify();
 212                        })
 213                        .ok();
 214                    }));
 215                }
 216            }
 217        } else {
 218            let old_rows = self.snapshot.transforms.summary().output.lines.row + 1;
 219            self.snapshot.transforms = SumTree::default();
 220            let summary = self.snapshot.tab_snapshot.text_summary();
 221            if !summary.lines.is_zero() {
 222                self.snapshot
 223                    .transforms
 224                    .push(Transform::isomorphic(summary), &());
 225            }
 226            let new_rows = self.snapshot.transforms.summary().output.lines.row + 1;
 227            self.snapshot.interpolated = false;
 228            self.edits_since_sync = self.edits_since_sync.compose(Patch::new(vec![WrapEdit {
 229                old: 0..old_rows,
 230                new: 0..new_rows,
 231            }]));
 232        }
 233    }
 234
 235    fn flush_edits(&mut self, cx: &mut Context<Self>) {
 236        if !self.snapshot.interpolated {
 237            let mut to_remove_len = 0;
 238            for (tab_snapshot, _) in &self.pending_edits {
 239                if tab_snapshot.version <= self.snapshot.tab_snapshot.version {
 240                    to_remove_len += 1;
 241                } else {
 242                    break;
 243                }
 244            }
 245            self.pending_edits.drain(..to_remove_len);
 246        }
 247
 248        if self.pending_edits.is_empty() {
 249            return;
 250        }
 251
 252        if let Some(wrap_width) = self.wrap_width {
 253            if self.background_task.is_none() {
 254                let pending_edits = self.pending_edits.clone();
 255                let mut snapshot = self.snapshot.clone();
 256                let text_system = cx.text_system().clone();
 257                let (font, font_size) = self.font_with_size.clone();
 258                let update_task = cx.background_spawn(async move {
 259                    let mut edits = Patch::default();
 260                    let mut line_wrapper = text_system.line_wrapper(font, font_size);
 261                    for (tab_snapshot, tab_edits) in pending_edits {
 262                        let wrap_edits = snapshot
 263                            .update(tab_snapshot, &tab_edits, wrap_width, &mut line_wrapper)
 264                            .await;
 265                        edits = edits.compose(&wrap_edits);
 266                    }
 267                    (snapshot, edits)
 268                });
 269
 270                match cx
 271                    .background_executor()
 272                    .block_with_timeout(Duration::from_millis(1), update_task)
 273                {
 274                    Ok((snapshot, output_edits)) => {
 275                        self.snapshot = snapshot;
 276                        self.edits_since_sync = self.edits_since_sync.compose(&output_edits);
 277                    }
 278                    Err(update_task) => {
 279                        self.background_task = Some(cx.spawn(async move |this, cx| {
 280                            let (snapshot, edits) = update_task.await;
 281                            this.update(cx, |this, cx| {
 282                                this.snapshot = snapshot;
 283                                this.edits_since_sync = this
 284                                    .edits_since_sync
 285                                    .compose(mem::take(&mut this.interpolated_edits).invert())
 286                                    .compose(&edits);
 287                                this.background_task = None;
 288                                this.flush_edits(cx);
 289                                cx.notify();
 290                            })
 291                            .ok();
 292                        }));
 293                    }
 294                }
 295            }
 296        }
 297
 298        let was_interpolated = self.snapshot.interpolated;
 299        let mut to_remove_len = 0;
 300        for (tab_snapshot, edits) in &self.pending_edits {
 301            if tab_snapshot.version <= self.snapshot.tab_snapshot.version {
 302                to_remove_len += 1;
 303            } else {
 304                let interpolated_edits = self.snapshot.interpolate(tab_snapshot.clone(), edits);
 305                self.edits_since_sync = self.edits_since_sync.compose(&interpolated_edits);
 306                self.interpolated_edits = self.interpolated_edits.compose(&interpolated_edits);
 307            }
 308        }
 309
 310        if !was_interpolated {
 311            self.pending_edits.drain(..to_remove_len);
 312        }
 313    }
 314}
 315
 316impl WrapSnapshot {
 317    fn new(tab_snapshot: TabSnapshot) -> Self {
 318        let mut transforms = SumTree::default();
 319        let extent = tab_snapshot.text_summary();
 320        if !extent.lines.is_zero() {
 321            transforms.push(Transform::isomorphic(extent), &());
 322        }
 323        Self {
 324            transforms,
 325            tab_snapshot,
 326            interpolated: true,
 327        }
 328    }
 329
 330    pub fn buffer_snapshot(&self) -> &MultiBufferSnapshot {
 331        self.tab_snapshot.buffer_snapshot()
 332    }
 333
 334    fn interpolate(&mut self, new_tab_snapshot: TabSnapshot, tab_edits: &[TabEdit]) -> Patch<u32> {
 335        let mut new_transforms;
 336        if tab_edits.is_empty() {
 337            new_transforms = self.transforms.clone();
 338        } else {
 339            let mut old_cursor = self.transforms.cursor::<TabPoint>(&());
 340
 341            let mut tab_edits_iter = tab_edits.iter().peekable();
 342            new_transforms =
 343                old_cursor.slice(&tab_edits_iter.peek().unwrap().old.start, Bias::Right, &());
 344
 345            while let Some(edit) = tab_edits_iter.next() {
 346                if edit.new.start > TabPoint::from(new_transforms.summary().input.lines) {
 347                    let summary = new_tab_snapshot.text_summary_for_range(
 348                        TabPoint::from(new_transforms.summary().input.lines)..edit.new.start,
 349                    );
 350                    new_transforms.push_or_extend(Transform::isomorphic(summary));
 351                }
 352
 353                if !edit.new.is_empty() {
 354                    new_transforms.push_or_extend(Transform::isomorphic(
 355                        new_tab_snapshot.text_summary_for_range(edit.new.clone()),
 356                    ));
 357                }
 358
 359                old_cursor.seek_forward(&edit.old.end, Bias::Right, &());
 360                if let Some(next_edit) = tab_edits_iter.peek() {
 361                    if next_edit.old.start > old_cursor.end(&()) {
 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
 369                        old_cursor.next(&());
 370                        new_transforms.append(
 371                            old_cursor.slice(&next_edit.old.start, Bias::Right, &()),
 372                            &(),
 373                        );
 374                    }
 375                } else {
 376                    if old_cursor.end(&()) > edit.old.end {
 377                        let summary = self
 378                            .tab_snapshot
 379                            .text_summary_for_range(edit.old.end..old_cursor.end(&()));
 380                        new_transforms.push_or_extend(Transform::isomorphic(summary));
 381                    }
 382                    old_cursor.next(&());
 383                    new_transforms.append(old_cursor.suffix(&()), &());
 384                }
 385            }
 386        }
 387
 388        let old_snapshot = mem::replace(
 389            self,
 390            WrapSnapshot {
 391                tab_snapshot: new_tab_snapshot,
 392                transforms: new_transforms,
 393                interpolated: true,
 394            },
 395        );
 396        self.check_invariants();
 397        old_snapshot.compute_edits(tab_edits, self)
 398    }
 399
 400    async fn update(
 401        &mut self,
 402        new_tab_snapshot: TabSnapshot,
 403        tab_edits: &[TabEdit],
 404        wrap_width: Pixels,
 405        line_wrapper: &mut LineWrapper,
 406    ) -> Patch<u32> {
 407        #[derive(Debug)]
 408        struct RowEdit {
 409            old_rows: Range<u32>,
 410            new_rows: Range<u32>,
 411        }
 412
 413        let mut tab_edits_iter = tab_edits.iter().peekable();
 414        let mut row_edits = Vec::with_capacity(tab_edits.len());
 415        while let Some(edit) = tab_edits_iter.next() {
 416            let mut row_edit = RowEdit {
 417                old_rows: edit.old.start.row()..edit.old.end.row() + 1,
 418                new_rows: edit.new.start.row()..edit.new.end.row() + 1,
 419            };
 420
 421            while let Some(next_edit) = tab_edits_iter.peek() {
 422                if next_edit.old.start.row() <= row_edit.old_rows.end {
 423                    row_edit.old_rows.end = next_edit.old.end.row() + 1;
 424                    row_edit.new_rows.end = next_edit.new.end.row() + 1;
 425                    tab_edits_iter.next();
 426                } else {
 427                    break;
 428                }
 429            }
 430
 431            row_edits.push(row_edit);
 432        }
 433
 434        let mut new_transforms;
 435        if row_edits.is_empty() {
 436            new_transforms = self.transforms.clone();
 437        } else {
 438            let mut row_edits = row_edits.into_iter().peekable();
 439            let mut old_cursor = self.transforms.cursor::<TabPoint>(&());
 440
 441            new_transforms = old_cursor.slice(
 442                &TabPoint::new(row_edits.peek().unwrap().old_rows.start, 0),
 443                Bias::Right,
 444                &(),
 445            );
 446
 447            while let Some(edit) = row_edits.next() {
 448                if edit.new_rows.start > new_transforms.summary().input.lines.row {
 449                    let summary = new_tab_snapshot.text_summary_for_range(
 450                        TabPoint(new_transforms.summary().input.lines)
 451                            ..TabPoint::new(edit.new_rows.start, 0),
 452                    );
 453                    new_transforms.push_or_extend(Transform::isomorphic(summary));
 454                }
 455
 456                let mut line = String::new();
 457                let mut line_fragments = Vec::new();
 458                let mut remaining = None;
 459                let mut chunks = new_tab_snapshot.chunks(
 460                    TabPoint::new(edit.new_rows.start, 0)..new_tab_snapshot.max_point(),
 461                    false,
 462                    Highlights::default(),
 463                );
 464                let mut edit_transforms = Vec::<Transform>::new();
 465                for _ in edit.new_rows.start..edit.new_rows.end {
 466                    while let Some(chunk) = remaining.take().or_else(|| chunks.next()) {
 467                        if let Some(ix) = chunk.text.find('\n') {
 468                            let (prefix, suffix) = chunk.text.split_at(ix + 1);
 469                            line_fragments.push(gpui::LineFragment::text(prefix));
 470                            line.push_str(prefix);
 471                            remaining = Some(Chunk {
 472                                text: suffix,
 473                                ..chunk
 474                            });
 475                            break;
 476                        } else {
 477                            if let Some(width) =
 478                                chunk.renderer.as_ref().and_then(|r| r.measured_width)
 479                            {
 480                                line_fragments
 481                                    .push(gpui::LineFragment::element(width, chunk.text.len()));
 482                            } else {
 483                                line_fragments.push(gpui::LineFragment::text(chunk.text));
 484                            }
 485                            line.push_str(chunk.text);
 486                        }
 487                    }
 488
 489                    if line.is_empty() {
 490                        break;
 491                    }
 492
 493                    let mut prev_boundary_ix = 0;
 494                    for boundary in line_wrapper.wrap_line(&line_fragments, wrap_width) {
 495                        let wrapped = &line[prev_boundary_ix..boundary.ix];
 496                        push_isomorphic(&mut edit_transforms, TextSummary::from(wrapped));
 497                        edit_transforms.push(Transform::wrap(boundary.next_indent));
 498                        prev_boundary_ix = boundary.ix;
 499                    }
 500
 501                    if prev_boundary_ix < line.len() {
 502                        push_isomorphic(
 503                            &mut edit_transforms,
 504                            TextSummary::from(&line[prev_boundary_ix..]),
 505                        );
 506                    }
 507
 508                    line.clear();
 509                    line_fragments.clear();
 510                    yield_now().await;
 511                }
 512
 513                let mut edit_transforms = edit_transforms.into_iter();
 514                if let Some(transform) = edit_transforms.next() {
 515                    new_transforms.push_or_extend(transform);
 516                }
 517                new_transforms.extend(edit_transforms, &());
 518
 519                old_cursor.seek_forward(&TabPoint::new(edit.old_rows.end, 0), Bias::Right, &());
 520                if let Some(next_edit) = row_edits.peek() {
 521                    if next_edit.old_rows.start > old_cursor.end(&()).row() {
 522                        if old_cursor.end(&()) > TabPoint::new(edit.old_rows.end, 0) {
 523                            let summary = self.tab_snapshot.text_summary_for_range(
 524                                TabPoint::new(edit.old_rows.end, 0)..old_cursor.end(&()),
 525                            );
 526                            new_transforms.push_or_extend(Transform::isomorphic(summary));
 527                        }
 528                        old_cursor.next(&());
 529                        new_transforms.append(
 530                            old_cursor.slice(
 531                                &TabPoint::new(next_edit.old_rows.start, 0),
 532                                Bias::Right,
 533                                &(),
 534                            ),
 535                            &(),
 536                        );
 537                    }
 538                } else {
 539                    if old_cursor.end(&()) > TabPoint::new(edit.old_rows.end, 0) {
 540                        let summary = self.tab_snapshot.text_summary_for_range(
 541                            TabPoint::new(edit.old_rows.end, 0)..old_cursor.end(&()),
 542                        );
 543                        new_transforms.push_or_extend(Transform::isomorphic(summary));
 544                    }
 545                    old_cursor.next(&());
 546                    new_transforms.append(old_cursor.suffix(&()), &());
 547                }
 548            }
 549        }
 550
 551        let old_snapshot = mem::replace(
 552            self,
 553            WrapSnapshot {
 554                tab_snapshot: new_tab_snapshot,
 555                transforms: new_transforms,
 556                interpolated: false,
 557            },
 558        );
 559        self.check_invariants();
 560        old_snapshot.compute_edits(tab_edits, self)
 561    }
 562
 563    fn compute_edits(&self, tab_edits: &[TabEdit], new_snapshot: &WrapSnapshot) -> Patch<u32> {
 564        let mut wrap_edits = Vec::with_capacity(tab_edits.len());
 565        let mut old_cursor = self.transforms.cursor::<TransformSummary>(&());
 566        let mut new_cursor = new_snapshot.transforms.cursor::<TransformSummary>(&());
 567        for mut tab_edit in tab_edits.iter().cloned() {
 568            tab_edit.old.start.0.column = 0;
 569            tab_edit.old.end.0 += Point::new(1, 0);
 570            tab_edit.new.start.0.column = 0;
 571            tab_edit.new.end.0 += Point::new(1, 0);
 572
 573            old_cursor.seek(&tab_edit.old.start, Bias::Right, &());
 574            let mut old_start = old_cursor.start().output.lines;
 575            old_start += tab_edit.old.start.0 - old_cursor.start().input.lines;
 576
 577            old_cursor.seek(&tab_edit.old.end, Bias::Right, &());
 578            let mut old_end = old_cursor.start().output.lines;
 579            old_end += tab_edit.old.end.0 - old_cursor.start().input.lines;
 580
 581            new_cursor.seek(&tab_edit.new.start, Bias::Right, &());
 582            let mut new_start = new_cursor.start().output.lines;
 583            new_start += tab_edit.new.start.0 - new_cursor.start().input.lines;
 584
 585            new_cursor.seek(&tab_edit.new.end, Bias::Right, &());
 586            let mut new_end = new_cursor.start().output.lines;
 587            new_end += tab_edit.new.end.0 - new_cursor.start().input.lines;
 588
 589            wrap_edits.push(WrapEdit {
 590                old: old_start.row..old_end.row,
 591                new: new_start.row..new_end.row,
 592            });
 593        }
 594
 595        wrap_edits = consolidate_wrap_edits(wrap_edits);
 596        Patch::new(wrap_edits)
 597    }
 598
 599    pub(crate) fn chunks<'a>(
 600        &'a self,
 601        rows: Range<u32>,
 602        language_aware: bool,
 603        highlights: Highlights<'a>,
 604    ) -> WrapChunks<'a> {
 605        let output_start = WrapPoint::new(rows.start, 0);
 606        let output_end = WrapPoint::new(rows.end, 0);
 607        let mut transforms = self.transforms.cursor::<(WrapPoint, TabPoint)>(&());
 608        transforms.seek(&output_start, Bias::Right, &());
 609        let mut input_start = TabPoint(transforms.start().1.0);
 610        if transforms.item().map_or(false, |t| t.is_isomorphic()) {
 611            input_start.0 += output_start.0 - transforms.start().0.0;
 612        }
 613        let input_end = self
 614            .to_tab_point(output_end)
 615            .min(self.tab_snapshot.max_point());
 616        WrapChunks {
 617            input_chunks: self.tab_snapshot.chunks(
 618                input_start..input_end,
 619                language_aware,
 620                highlights,
 621            ),
 622            input_chunk: Default::default(),
 623            output_position: output_start,
 624            max_output_row: rows.end,
 625            transforms,
 626            snapshot: self,
 627        }
 628    }
 629
 630    pub fn max_point(&self) -> WrapPoint {
 631        WrapPoint(self.transforms.summary().output.lines)
 632    }
 633
 634    pub fn line_len(&self, row: u32) -> u32 {
 635        let mut cursor = self.transforms.cursor::<(WrapPoint, TabPoint)>(&());
 636        cursor.seek(&WrapPoint::new(row + 1, 0), Bias::Left, &());
 637        if cursor
 638            .item()
 639            .map_or(false, |transform| transform.is_isomorphic())
 640        {
 641            let overshoot = row - cursor.start().0.row();
 642            let tab_row = cursor.start().1.row() + overshoot;
 643            let tab_line_len = self.tab_snapshot.line_len(tab_row);
 644            if overshoot == 0 {
 645                cursor.start().0.column() + (tab_line_len - cursor.start().1.column())
 646            } else {
 647                tab_line_len
 648            }
 649        } else {
 650            cursor.start().0.column()
 651        }
 652    }
 653
 654    pub fn text_summary_for_range(&self, rows: Range<u32>) -> TextSummary {
 655        let mut summary = TextSummary::default();
 656
 657        let start = WrapPoint::new(rows.start, 0);
 658        let end = WrapPoint::new(rows.end, 0);
 659
 660        let mut cursor = self.transforms.cursor::<(WrapPoint, TabPoint)>(&());
 661        cursor.seek(&start, Bias::Right, &());
 662        if let Some(transform) = cursor.item() {
 663            let start_in_transform = start.0 - cursor.start().0.0;
 664            let end_in_transform = cmp::min(end, cursor.end(&()).0).0 - cursor.start().0.0;
 665            if transform.is_isomorphic() {
 666                let tab_start = TabPoint(cursor.start().1.0 + start_in_transform);
 667                let tab_end = TabPoint(cursor.start().1.0 + end_in_transform);
 668                summary += &self.tab_snapshot.text_summary_for_range(tab_start..tab_end);
 669            } else {
 670                debug_assert_eq!(start_in_transform.row, end_in_transform.row);
 671                let indent_len = end_in_transform.column - start_in_transform.column;
 672                summary += &TextSummary {
 673                    lines: Point::new(0, indent_len),
 674                    first_line_chars: indent_len,
 675                    last_line_chars: indent_len,
 676                    longest_row: 0,
 677                    longest_row_chars: indent_len,
 678                };
 679            }
 680
 681            cursor.next(&());
 682        }
 683
 684        if rows.end > cursor.start().0.row() {
 685            summary += &cursor
 686                .summary::<_, TransformSummary>(&WrapPoint::new(rows.end, 0), Bias::Right, &())
 687                .output;
 688
 689            if let Some(transform) = cursor.item() {
 690                let end_in_transform = end.0 - cursor.start().0.0;
 691                if transform.is_isomorphic() {
 692                    let char_start = cursor.start().1;
 693                    let char_end = TabPoint(char_start.0 + end_in_transform);
 694                    summary += &self
 695                        .tab_snapshot
 696                        .text_summary_for_range(char_start..char_end);
 697                } else {
 698                    debug_assert_eq!(end_in_transform, Point::new(1, 0));
 699                    summary += &TextSummary {
 700                        lines: Point::new(1, 0),
 701                        first_line_chars: 0,
 702                        last_line_chars: 0,
 703                        longest_row: 0,
 704                        longest_row_chars: 0,
 705                    };
 706                }
 707            }
 708        }
 709
 710        summary
 711    }
 712
 713    pub fn soft_wrap_indent(&self, row: u32) -> Option<u32> {
 714        let mut cursor = self.transforms.cursor::<WrapPoint>(&());
 715        cursor.seek(&WrapPoint::new(row + 1, 0), Bias::Right, &());
 716        cursor.item().and_then(|transform| {
 717            if transform.is_isomorphic() {
 718                None
 719            } else {
 720                Some(transform.summary.output.lines.column)
 721            }
 722        })
 723    }
 724
 725    pub fn longest_row(&self) -> u32 {
 726        self.transforms.summary().output.longest_row
 727    }
 728
 729    pub fn row_infos(&self, start_row: u32) -> WrapRows {
 730        let mut transforms = self.transforms.cursor::<(WrapPoint, TabPoint)>(&());
 731        transforms.seek(&WrapPoint::new(start_row, 0), Bias::Left, &());
 732        let mut input_row = transforms.start().1.row();
 733        if transforms.item().map_or(false, |t| t.is_isomorphic()) {
 734            input_row += start_row - transforms.start().0.row();
 735        }
 736        let soft_wrapped = transforms.item().map_or(false, |t| !t.is_isomorphic());
 737        let mut input_buffer_rows = self.tab_snapshot.rows(input_row);
 738        let input_buffer_row = input_buffer_rows.next().unwrap();
 739        WrapRows {
 740            transforms,
 741            input_buffer_row,
 742            input_buffer_rows,
 743            output_row: start_row,
 744            soft_wrapped,
 745            max_output_row: self.max_point().row(),
 746        }
 747    }
 748
 749    pub fn to_tab_point(&self, point: WrapPoint) -> TabPoint {
 750        let mut cursor = self.transforms.cursor::<(WrapPoint, TabPoint)>(&());
 751        cursor.seek(&point, Bias::Right, &());
 752        let mut tab_point = cursor.start().1.0;
 753        if cursor.item().map_or(false, |t| t.is_isomorphic()) {
 754            tab_point += point.0 - cursor.start().0.0;
 755        }
 756        TabPoint(tab_point)
 757    }
 758
 759    pub fn to_point(&self, point: WrapPoint, bias: Bias) -> Point {
 760        self.tab_snapshot.to_point(self.to_tab_point(point), bias)
 761    }
 762
 763    pub fn make_wrap_point(&self, point: Point, bias: Bias) -> WrapPoint {
 764        self.tab_point_to_wrap_point(self.tab_snapshot.make_tab_point(point, bias))
 765    }
 766
 767    pub fn tab_point_to_wrap_point(&self, point: TabPoint) -> WrapPoint {
 768        let mut cursor = self.transforms.cursor::<(TabPoint, WrapPoint)>(&());
 769        cursor.seek(&point, Bias::Right, &());
 770        WrapPoint(cursor.start().1.0 + (point.0 - cursor.start().0.0))
 771    }
 772
 773    pub fn clip_point(&self, mut point: WrapPoint, bias: Bias) -> WrapPoint {
 774        if bias == Bias::Left {
 775            let mut cursor = self.transforms.cursor::<WrapPoint>(&());
 776            cursor.seek(&point, Bias::Right, &());
 777            if cursor.item().map_or(false, |t| !t.is_isomorphic()) {
 778                point = *cursor.start();
 779                *point.column_mut() -= 1;
 780            }
 781        }
 782
 783        self.tab_point_to_wrap_point(self.tab_snapshot.clip_point(self.to_tab_point(point), bias))
 784    }
 785
 786    pub fn prev_row_boundary(&self, mut point: WrapPoint) -> u32 {
 787        if self.transforms.is_empty() {
 788            return 0;
 789        }
 790
 791        *point.column_mut() = 0;
 792
 793        let mut cursor = self.transforms.cursor::<(WrapPoint, TabPoint)>(&());
 794        cursor.seek(&point, Bias::Right, &());
 795        if cursor.item().is_none() {
 796            cursor.prev(&());
 797        }
 798
 799        while let Some(transform) = cursor.item() {
 800            if transform.is_isomorphic() && cursor.start().1.column() == 0 {
 801                return cmp::min(cursor.end(&()).0.row(), point.row());
 802            } else {
 803                cursor.prev(&());
 804            }
 805        }
 806
 807        unreachable!()
 808    }
 809
 810    pub fn next_row_boundary(&self, mut point: WrapPoint) -> Option<u32> {
 811        point.0 += Point::new(1, 0);
 812
 813        let mut cursor = self.transforms.cursor::<(WrapPoint, TabPoint)>(&());
 814        cursor.seek(&point, Bias::Right, &());
 815        while let Some(transform) = cursor.item() {
 816            if transform.is_isomorphic() && cursor.start().1.column() == 0 {
 817                return Some(cmp::max(cursor.start().0.row(), point.row()));
 818            } else {
 819                cursor.next(&());
 820            }
 821        }
 822
 823        None
 824    }
 825
 826    #[cfg(test)]
 827    pub fn text(&self) -> String {
 828        self.text_chunks(0).collect()
 829    }
 830
 831    #[cfg(test)]
 832    pub fn text_chunks(&self, wrap_row: u32) -> impl Iterator<Item = &str> {
 833        self.chunks(
 834            wrap_row..self.max_point().row() + 1,
 835            false,
 836            Highlights::default(),
 837        )
 838        .map(|h| h.text)
 839    }
 840
 841    fn check_invariants(&self) {
 842        #[cfg(test)]
 843        {
 844            assert_eq!(
 845                TabPoint::from(self.transforms.summary().input.lines),
 846                self.tab_snapshot.max_point()
 847            );
 848
 849            {
 850                let mut transforms = self.transforms.cursor::<()>(&()).peekable();
 851                while let Some(transform) = transforms.next() {
 852                    if let Some(next_transform) = transforms.peek() {
 853                        assert!(transform.is_isomorphic() != next_transform.is_isomorphic());
 854                    }
 855                }
 856            }
 857
 858            let text = language::Rope::from(self.text().as_str());
 859            let mut input_buffer_rows = self.tab_snapshot.rows(0);
 860            let mut expected_buffer_rows = Vec::new();
 861            let mut prev_tab_row = 0;
 862            for display_row in 0..=self.max_point().row() {
 863                let tab_point = self.to_tab_point(WrapPoint::new(display_row, 0));
 864                if tab_point.row() == prev_tab_row && display_row != 0 {
 865                    expected_buffer_rows.push(None);
 866                } else {
 867                    expected_buffer_rows.push(input_buffer_rows.next().unwrap().buffer_row);
 868                }
 869
 870                prev_tab_row = tab_point.row();
 871                assert_eq!(self.line_len(display_row), text.line_len(display_row));
 872            }
 873
 874            for start_display_row in 0..expected_buffer_rows.len() {
 875                assert_eq!(
 876                    self.row_infos(start_display_row as u32)
 877                        .map(|row_info| row_info.buffer_row)
 878                        .collect::<Vec<_>>(),
 879                    &expected_buffer_rows[start_display_row..],
 880                    "invalid buffer_rows({}..)",
 881                    start_display_row
 882                );
 883            }
 884        }
 885    }
 886}
 887
 888impl WrapChunks<'_> {
 889    pub(crate) fn seek(&mut self, rows: Range<u32>) {
 890        let output_start = WrapPoint::new(rows.start, 0);
 891        let output_end = WrapPoint::new(rows.end, 0);
 892        self.transforms.seek(&output_start, Bias::Right, &());
 893        let mut input_start = TabPoint(self.transforms.start().1.0);
 894        if self.transforms.item().map_or(false, |t| t.is_isomorphic()) {
 895            input_start.0 += output_start.0 - self.transforms.start().0.0;
 896        }
 897        let input_end = self
 898            .snapshot
 899            .to_tab_point(output_end)
 900            .min(self.snapshot.tab_snapshot.max_point());
 901        self.input_chunks.seek(input_start..input_end);
 902        self.input_chunk = Chunk::default();
 903        self.output_position = output_start;
 904        self.max_output_row = rows.end;
 905    }
 906}
 907
 908impl<'a> Iterator for WrapChunks<'a> {
 909    type Item = Chunk<'a>;
 910
 911    fn next(&mut self) -> Option<Self::Item> {
 912        if self.output_position.row() >= self.max_output_row {
 913            return None;
 914        }
 915
 916        let transform = self.transforms.item()?;
 917        if let Some(display_text) = transform.display_text {
 918            let mut start_ix = 0;
 919            let mut end_ix = display_text.len();
 920            let mut summary = transform.summary.output.lines;
 921
 922            if self.output_position > self.transforms.start().0 {
 923                // Exclude newline starting prior to the desired row.
 924                start_ix = 1;
 925                summary.row = 0;
 926            } else if self.output_position.row() + 1 >= self.max_output_row {
 927                // Exclude soft indentation ending after the desired row.
 928                end_ix = 1;
 929                summary.column = 0;
 930            }
 931
 932            self.output_position.0 += summary;
 933            self.transforms.next(&());
 934            return Some(Chunk {
 935                text: &display_text[start_ix..end_ix],
 936                ..self.input_chunk.clone()
 937            });
 938        }
 939
 940        if self.input_chunk.text.is_empty() {
 941            self.input_chunk = self.input_chunks.next().unwrap();
 942        }
 943
 944        let mut input_len = 0;
 945        let transform_end = self.transforms.end(&()).0;
 946        for c in self.input_chunk.text.chars() {
 947            let char_len = c.len_utf8();
 948            input_len += char_len;
 949            if c == '\n' {
 950                *self.output_position.row_mut() += 1;
 951                *self.output_position.column_mut() = 0;
 952            } else {
 953                *self.output_position.column_mut() += char_len as u32;
 954            }
 955
 956            if self.output_position >= transform_end {
 957                self.transforms.next(&());
 958                break;
 959            }
 960        }
 961
 962        let (prefix, suffix) = self.input_chunk.text.split_at(input_len);
 963        self.input_chunk.text = suffix;
 964        Some(Chunk {
 965            text: prefix,
 966            ..self.input_chunk.clone()
 967        })
 968    }
 969}
 970
 971impl Iterator for WrapRows<'_> {
 972    type Item = RowInfo;
 973
 974    fn next(&mut self) -> Option<Self::Item> {
 975        if self.output_row > self.max_output_row {
 976            return None;
 977        }
 978
 979        let buffer_row = self.input_buffer_row;
 980        let soft_wrapped = self.soft_wrapped;
 981        let diff_status = self.input_buffer_row.diff_status;
 982
 983        self.output_row += 1;
 984        self.transforms
 985            .seek_forward(&WrapPoint::new(self.output_row, 0), Bias::Left, &());
 986        if self.transforms.item().map_or(false, |t| t.is_isomorphic()) {
 987            self.input_buffer_row = self.input_buffer_rows.next().unwrap();
 988            self.soft_wrapped = false;
 989        } else {
 990            self.soft_wrapped = true;
 991        }
 992
 993        Some(if soft_wrapped {
 994            RowInfo {
 995                buffer_id: None,
 996                buffer_row: None,
 997                multibuffer_row: None,
 998                diff_status,
 999                expand_info: None,
1000            }
1001        } else {
1002            buffer_row
1003        })
1004    }
1005}
1006
1007impl Transform {
1008    fn isomorphic(summary: TextSummary) -> Self {
1009        #[cfg(test)]
1010        assert!(!summary.lines.is_zero());
1011
1012        Self {
1013            summary: TransformSummary {
1014                input: summary.clone(),
1015                output: summary,
1016            },
1017            display_text: None,
1018        }
1019    }
1020
1021    fn wrap(indent: u32) -> Self {
1022        static WRAP_TEXT: LazyLock<String> = LazyLock::new(|| {
1023            let mut wrap_text = String::new();
1024            wrap_text.push('\n');
1025            wrap_text.extend((0..LineWrapper::MAX_INDENT as usize).map(|_| ' '));
1026            wrap_text
1027        });
1028
1029        Self {
1030            summary: TransformSummary {
1031                input: TextSummary::default(),
1032                output: TextSummary {
1033                    lines: Point::new(1, indent),
1034                    first_line_chars: 0,
1035                    last_line_chars: indent,
1036                    longest_row: 1,
1037                    longest_row_chars: indent,
1038                },
1039            },
1040            display_text: Some(&WRAP_TEXT[..1 + indent as usize]),
1041        }
1042    }
1043
1044    fn is_isomorphic(&self) -> bool {
1045        self.display_text.is_none()
1046    }
1047}
1048
1049impl sum_tree::Item for Transform {
1050    type Summary = TransformSummary;
1051
1052    fn summary(&self, _cx: &()) -> Self::Summary {
1053        self.summary.clone()
1054    }
1055}
1056
1057fn push_isomorphic(transforms: &mut Vec<Transform>, summary: TextSummary) {
1058    if let Some(last_transform) = transforms.last_mut() {
1059        if last_transform.is_isomorphic() {
1060            last_transform.summary.input += &summary;
1061            last_transform.summary.output += &summary;
1062            return;
1063        }
1064    }
1065    transforms.push(Transform::isomorphic(summary));
1066}
1067
1068trait SumTreeExt {
1069    fn push_or_extend(&mut self, transform: Transform);
1070}
1071
1072impl SumTreeExt for SumTree<Transform> {
1073    fn push_or_extend(&mut self, transform: Transform) {
1074        let mut transform = Some(transform);
1075        self.update_last(
1076            |last_transform| {
1077                if last_transform.is_isomorphic() && transform.as_ref().unwrap().is_isomorphic() {
1078                    let transform = transform.take().unwrap();
1079                    last_transform.summary.input += &transform.summary.input;
1080                    last_transform.summary.output += &transform.summary.output;
1081                }
1082            },
1083            &(),
1084        );
1085
1086        if let Some(transform) = transform {
1087            self.push(transform, &());
1088        }
1089    }
1090}
1091
1092impl WrapPoint {
1093    pub fn new(row: u32, column: u32) -> Self {
1094        Self(Point::new(row, column))
1095    }
1096
1097    pub fn row(self) -> u32 {
1098        self.0.row
1099    }
1100
1101    pub fn row_mut(&mut self) -> &mut u32 {
1102        &mut self.0.row
1103    }
1104
1105    pub fn column(self) -> u32 {
1106        self.0.column
1107    }
1108
1109    pub fn column_mut(&mut self) -> &mut u32 {
1110        &mut self.0.column
1111    }
1112}
1113
1114impl sum_tree::Summary for TransformSummary {
1115    type Context = ();
1116
1117    fn zero(_cx: &()) -> Self {
1118        Default::default()
1119    }
1120
1121    fn add_summary(&mut self, other: &Self, _: &()) {
1122        self.input += &other.input;
1123        self.output += &other.output;
1124    }
1125}
1126
1127impl<'a> sum_tree::Dimension<'a, TransformSummary> for TabPoint {
1128    fn zero(_cx: &()) -> Self {
1129        Default::default()
1130    }
1131
1132    fn add_summary(&mut self, summary: &'a TransformSummary, _: &()) {
1133        self.0 += summary.input.lines;
1134    }
1135}
1136
1137impl sum_tree::SeekTarget<'_, TransformSummary, TransformSummary> for TabPoint {
1138    fn cmp(&self, cursor_location: &TransformSummary, _: &()) -> std::cmp::Ordering {
1139        Ord::cmp(&self.0, &cursor_location.input.lines)
1140    }
1141}
1142
1143impl<'a> sum_tree::Dimension<'a, TransformSummary> for WrapPoint {
1144    fn zero(_cx: &()) -> Self {
1145        Default::default()
1146    }
1147
1148    fn add_summary(&mut self, summary: &'a TransformSummary, _: &()) {
1149        self.0 += summary.output.lines;
1150    }
1151}
1152
1153fn consolidate_wrap_edits(edits: Vec<WrapEdit>) -> Vec<WrapEdit> {
1154    let _old_alloc_ptr = edits.as_ptr();
1155    let mut wrap_edits = edits.into_iter();
1156
1157    if let Some(mut first_edit) = wrap_edits.next() {
1158        // This code relies on reusing allocations from the Vec<_> - at the time of writing .flatten() prevents them.
1159        #[allow(clippy::filter_map_identity)]
1160        let mut v: Vec<_> = wrap_edits
1161            .scan(&mut first_edit, |prev_edit, edit| {
1162                if prev_edit.old.end >= edit.old.start {
1163                    prev_edit.old.end = edit.old.end;
1164                    prev_edit.new.end = edit.new.end;
1165                    Some(None) // Skip this edit, it's merged
1166                } else {
1167                    let prev = std::mem::replace(*prev_edit, edit);
1168                    Some(Some(prev)) // Yield the previous edit
1169                }
1170            })
1171            .filter_map(|x| x)
1172            .collect();
1173        v.push(first_edit.clone());
1174        debug_assert_eq!(v.as_ptr(), _old_alloc_ptr, "Wrap edits were reallocated");
1175        v
1176    } else {
1177        vec![]
1178    }
1179}
1180
1181#[cfg(test)]
1182mod tests {
1183    use super::*;
1184    use crate::{
1185        MultiBuffer,
1186        display_map::{fold_map::FoldMap, inlay_map::InlayMap, tab_map::TabMap},
1187        test::test_font,
1188    };
1189    use gpui::{LineFragment, px, test::observe};
1190    use rand::prelude::*;
1191    use settings::SettingsStore;
1192    use smol::stream::StreamExt;
1193    use std::{cmp, env, num::NonZeroU32};
1194    use text::Rope;
1195    use theme::LoadThemes;
1196
1197    #[gpui::test(iterations = 100)]
1198    async fn test_random_wraps(cx: &mut gpui::TestAppContext, mut rng: StdRng) {
1199        // todo this test is flaky
1200        init_test(cx);
1201
1202        cx.background_executor.set_block_on_ticks(0..=50);
1203        let operations = env::var("OPERATIONS")
1204            .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
1205            .unwrap_or(10);
1206
1207        let text_system = cx.read(|cx| cx.text_system().clone());
1208        let mut wrap_width = if rng.gen_bool(0.1) {
1209            None
1210        } else {
1211            Some(px(rng.gen_range(0.0..=1000.0)))
1212        };
1213        let tab_size = NonZeroU32::new(rng.gen_range(1..=4)).unwrap();
1214
1215        let font = test_font();
1216        let _font_id = text_system.font_id(&font);
1217        let font_size = px(14.0);
1218
1219        log::info!("Tab size: {}", tab_size);
1220        log::info!("Wrap width: {:?}", wrap_width);
1221
1222        let buffer = cx.update(|cx| {
1223            if rng.r#gen() {
1224                MultiBuffer::build_random(&mut rng, cx)
1225            } else {
1226                let len = rng.gen_range(0..10);
1227                let text = util::RandomCharIter::new(&mut rng)
1228                    .take(len)
1229                    .collect::<String>();
1230                MultiBuffer::build_simple(&text, cx)
1231            }
1232        });
1233        let mut buffer_snapshot = buffer.read_with(cx, |buffer, cx| buffer.snapshot(cx));
1234        log::info!("Buffer text: {:?}", buffer_snapshot.text());
1235        let (mut inlay_map, inlay_snapshot) = InlayMap::new(buffer_snapshot.clone());
1236        log::info!("InlayMap text: {:?}", inlay_snapshot.text());
1237        let (mut fold_map, fold_snapshot) = FoldMap::new(inlay_snapshot.clone());
1238        log::info!("FoldMap text: {:?}", fold_snapshot.text());
1239        let (mut tab_map, _) = TabMap::new(fold_snapshot.clone(), tab_size);
1240        let tabs_snapshot = tab_map.set_max_expansion_column(32);
1241        log::info!("TabMap text: {:?}", tabs_snapshot.text());
1242
1243        let mut line_wrapper = text_system.line_wrapper(font.clone(), font_size);
1244        let expected_text = wrap_text(&tabs_snapshot, wrap_width, &mut line_wrapper);
1245
1246        let (wrap_map, _) =
1247            cx.update(|cx| WrapMap::new(tabs_snapshot.clone(), font, font_size, wrap_width, cx));
1248        let mut notifications = observe(&wrap_map, cx);
1249
1250        if wrap_map.read_with(cx, |map, _| map.is_rewrapping()) {
1251            notifications.next().await.unwrap();
1252        }
1253
1254        let (initial_snapshot, _) = wrap_map.update(cx, |map, cx| {
1255            assert!(!map.is_rewrapping());
1256            map.sync(tabs_snapshot.clone(), Vec::new(), cx)
1257        });
1258
1259        let actual_text = initial_snapshot.text();
1260        assert_eq!(
1261            actual_text,
1262            expected_text,
1263            "unwrapped text is: {:?}",
1264            tabs_snapshot.text()
1265        );
1266        log::info!("Wrapped text: {:?}", actual_text);
1267
1268        let mut next_inlay_id = 0;
1269        let mut edits = Vec::new();
1270        for _i in 0..operations {
1271            log::info!("{} ==============================================", _i);
1272
1273            let mut buffer_edits = Vec::new();
1274            match rng.gen_range(0..=100) {
1275                0..=19 => {
1276                    wrap_width = if rng.gen_bool(0.2) {
1277                        None
1278                    } else {
1279                        Some(px(rng.gen_range(0.0..=1000.0)))
1280                    };
1281                    log::info!("Setting wrap width to {:?}", wrap_width);
1282                    wrap_map.update(cx, |map, cx| map.set_wrap_width(wrap_width, cx));
1283                }
1284                20..=39 => {
1285                    for (fold_snapshot, fold_edits) in fold_map.randomly_mutate(&mut rng) {
1286                        let (tabs_snapshot, tab_edits) =
1287                            tab_map.sync(fold_snapshot, fold_edits, tab_size);
1288                        let (mut snapshot, wrap_edits) =
1289                            wrap_map.update(cx, |map, cx| map.sync(tabs_snapshot, tab_edits, cx));
1290                        snapshot.check_invariants();
1291                        snapshot.verify_chunks(&mut rng);
1292                        edits.push((snapshot, wrap_edits));
1293                    }
1294                }
1295                40..=59 => {
1296                    let (inlay_snapshot, inlay_edits) =
1297                        inlay_map.randomly_mutate(&mut next_inlay_id, &mut rng);
1298                    let (fold_snapshot, fold_edits) = fold_map.read(inlay_snapshot, inlay_edits);
1299                    let (tabs_snapshot, tab_edits) =
1300                        tab_map.sync(fold_snapshot, fold_edits, tab_size);
1301                    let (mut snapshot, wrap_edits) =
1302                        wrap_map.update(cx, |map, cx| map.sync(tabs_snapshot, tab_edits, cx));
1303                    snapshot.check_invariants();
1304                    snapshot.verify_chunks(&mut rng);
1305                    edits.push((snapshot, wrap_edits));
1306                }
1307                _ => {
1308                    buffer.update(cx, |buffer, cx| {
1309                        let subscription = buffer.subscribe();
1310                        let edit_count = rng.gen_range(1..=5);
1311                        buffer.randomly_mutate(&mut rng, edit_count, cx);
1312                        buffer_snapshot = buffer.snapshot(cx);
1313                        buffer_edits.extend(subscription.consume());
1314                    });
1315                }
1316            }
1317
1318            log::info!("Buffer text: {:?}", buffer_snapshot.text());
1319            let (inlay_snapshot, inlay_edits) =
1320                inlay_map.sync(buffer_snapshot.clone(), buffer_edits);
1321            log::info!("InlayMap text: {:?}", inlay_snapshot.text());
1322            let (fold_snapshot, fold_edits) = fold_map.read(inlay_snapshot, inlay_edits);
1323            log::info!("FoldMap text: {:?}", fold_snapshot.text());
1324            let (tabs_snapshot, tab_edits) = tab_map.sync(fold_snapshot, fold_edits, tab_size);
1325            log::info!("TabMap text: {:?}", tabs_snapshot.text());
1326
1327            let expected_text = wrap_text(&tabs_snapshot, wrap_width, &mut line_wrapper);
1328            let (mut snapshot, wrap_edits) =
1329                wrap_map.update(cx, |map, cx| map.sync(tabs_snapshot.clone(), tab_edits, cx));
1330            snapshot.check_invariants();
1331            snapshot.verify_chunks(&mut rng);
1332            edits.push((snapshot, wrap_edits));
1333
1334            if wrap_map.read_with(cx, |map, _| map.is_rewrapping()) && rng.gen_bool(0.4) {
1335                log::info!("Waiting for wrapping to finish");
1336                while wrap_map.read_with(cx, |map, _| map.is_rewrapping()) {
1337                    notifications.next().await.unwrap();
1338                }
1339                wrap_map.read_with(cx, |map, _| assert!(map.pending_edits.is_empty()));
1340            }
1341
1342            if !wrap_map.read_with(cx, |map, _| map.is_rewrapping()) {
1343                let (mut wrapped_snapshot, wrap_edits) = wrap_map.update(cx, |map, cx| {
1344                    map.sync(tabs_snapshot.clone(), Vec::new(), cx)
1345                });
1346                let actual_text = wrapped_snapshot.text();
1347                let actual_longest_row = wrapped_snapshot.longest_row();
1348                log::info!("Wrapping finished: {:?}", actual_text);
1349                wrapped_snapshot.check_invariants();
1350                wrapped_snapshot.verify_chunks(&mut rng);
1351                edits.push((wrapped_snapshot.clone(), wrap_edits));
1352                assert_eq!(
1353                    actual_text,
1354                    expected_text,
1355                    "unwrapped text is: {:?}",
1356                    tabs_snapshot.text()
1357                );
1358
1359                let mut summary = TextSummary::default();
1360                for (ix, item) in wrapped_snapshot
1361                    .transforms
1362                    .items(&())
1363                    .into_iter()
1364                    .enumerate()
1365                {
1366                    summary += &item.summary.output;
1367                    log::info!("{} summary: {:?}", ix, item.summary.output,);
1368                }
1369
1370                if tab_size.get() == 1
1371                    || !wrapped_snapshot
1372                        .tab_snapshot
1373                        .fold_snapshot
1374                        .text()
1375                        .contains('\t')
1376                {
1377                    let mut expected_longest_rows = Vec::new();
1378                    let mut longest_line_len = -1;
1379                    for (row, line) in expected_text.split('\n').enumerate() {
1380                        let line_char_count = line.chars().count() as isize;
1381                        if line_char_count > longest_line_len {
1382                            expected_longest_rows.clear();
1383                            longest_line_len = line_char_count;
1384                        }
1385                        if line_char_count >= longest_line_len {
1386                            expected_longest_rows.push(row as u32);
1387                        }
1388                    }
1389
1390                    assert!(
1391                        expected_longest_rows.contains(&actual_longest_row),
1392                        "incorrect longest row {}. expected {:?} with length {}",
1393                        actual_longest_row,
1394                        expected_longest_rows,
1395                        longest_line_len,
1396                    )
1397                }
1398            }
1399        }
1400
1401        let mut initial_text = Rope::from(initial_snapshot.text().as_str());
1402        for (snapshot, patch) in edits {
1403            let snapshot_text = Rope::from(snapshot.text().as_str());
1404            for edit in &patch {
1405                let old_start = initial_text.point_to_offset(Point::new(edit.new.start, 0));
1406                let old_end = initial_text.point_to_offset(cmp::min(
1407                    Point::new(edit.new.start + edit.old.len() as u32, 0),
1408                    initial_text.max_point(),
1409                ));
1410                let new_start = snapshot_text.point_to_offset(Point::new(edit.new.start, 0));
1411                let new_end = snapshot_text.point_to_offset(cmp::min(
1412                    Point::new(edit.new.end, 0),
1413                    snapshot_text.max_point(),
1414                ));
1415                let new_text = snapshot_text
1416                    .chunks_in_range(new_start..new_end)
1417                    .collect::<String>();
1418
1419                initial_text.replace(old_start..old_end, &new_text);
1420            }
1421            assert_eq!(initial_text.to_string(), snapshot_text.to_string());
1422        }
1423
1424        if wrap_map.read_with(cx, |map, _| map.is_rewrapping()) {
1425            log::info!("Waiting for wrapping to finish");
1426            while wrap_map.read_with(cx, |map, _| map.is_rewrapping()) {
1427                notifications.next().await.unwrap();
1428            }
1429        }
1430        wrap_map.read_with(cx, |map, _| assert!(map.pending_edits.is_empty()));
1431    }
1432
1433    fn init_test(cx: &mut gpui::TestAppContext) {
1434        cx.update(|cx| {
1435            let settings = SettingsStore::test(cx);
1436            cx.set_global(settings);
1437            theme::init(LoadThemes::JustBase, cx);
1438        });
1439    }
1440
1441    fn wrap_text(
1442        tab_snapshot: &TabSnapshot,
1443        wrap_width: Option<Pixels>,
1444        line_wrapper: &mut LineWrapper,
1445    ) -> String {
1446        if let Some(wrap_width) = wrap_width {
1447            let mut wrapped_text = String::new();
1448            for (row, line) in tab_snapshot.text().split('\n').enumerate() {
1449                if row > 0 {
1450                    wrapped_text.push('\n');
1451                }
1452
1453                let mut prev_ix = 0;
1454                for boundary in line_wrapper.wrap_line(&[LineFragment::text(&line)], wrap_width) {
1455                    wrapped_text.push_str(&line[prev_ix..boundary.ix]);
1456                    wrapped_text.push('\n');
1457                    wrapped_text.push_str(&" ".repeat(boundary.next_indent as usize));
1458                    prev_ix = boundary.ix;
1459                }
1460                wrapped_text.push_str(&line[prev_ix..]);
1461            }
1462
1463            wrapped_text
1464        } else {
1465            tab_snapshot.text()
1466        }
1467    }
1468
1469    impl WrapSnapshot {
1470        fn verify_chunks(&mut self, rng: &mut impl Rng) {
1471            for _ in 0..5 {
1472                let mut end_row = rng.gen_range(0..=self.max_point().row());
1473                let start_row = rng.gen_range(0..=end_row);
1474                end_row += 1;
1475
1476                let mut expected_text = self.text_chunks(start_row).collect::<String>();
1477                if expected_text.ends_with('\n') {
1478                    expected_text.push('\n');
1479                }
1480                let mut expected_text = expected_text
1481                    .lines()
1482                    .take((end_row - start_row) as usize)
1483                    .collect::<Vec<_>>()
1484                    .join("\n");
1485                if end_row <= self.max_point().row() {
1486                    expected_text.push('\n');
1487                }
1488
1489                let actual_text = self
1490                    .chunks(start_row..end_row, true, Highlights::default())
1491                    .map(|c| c.text)
1492                    .collect::<String>();
1493                assert_eq!(
1494                    expected_text,
1495                    actual_text,
1496                    "chunks != highlighted_chunks for rows {:?}",
1497                    start_row..end_row
1498                );
1499            }
1500        }
1501    }
1502}