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