1pub mod parser;
2mod path_range;
3
4use base64::Engine as _;
5use futures::FutureExt as _;
6use gpui::HitboxBehavior;
7use language::LanguageName;
8use log::Level;
9pub use path_range::{LineCol, PathWithRange};
10use ui::Checkbox;
11
12use std::borrow::Cow;
13use std::iter;
14use std::mem;
15use std::ops::Range;
16use std::path::Path;
17use std::rc::Rc;
18use std::sync::Arc;
19use std::time::Duration;
20
21use collections::{HashMap, HashSet};
22use gpui::{
23 AnyElement, App, BorderStyle, Bounds, ClipboardItem, CursorStyle, DispatchPhase, Edges, Entity,
24 FocusHandle, Focusable, FontStyle, FontWeight, GlobalElementId, Hitbox, Hsla, Image,
25 ImageFormat, KeyContext, Length, MouseDownEvent, MouseEvent, MouseMoveEvent, MouseUpEvent,
26 Point, ScrollHandle, Stateful, StrikethroughStyle, StyleRefinement, StyledText, Task,
27 TextLayout, TextRun, TextStyle, TextStyleRefinement, actions, img, point, quad,
28};
29use language::{Language, LanguageRegistry, Rope};
30use parser::CodeBlockMetadata;
31use parser::{MarkdownEvent, MarkdownTag, MarkdownTagEnd, parse_links_only, parse_markdown};
32use pulldown_cmark::Alignment;
33use sum_tree::TreeMap;
34use theme::SyntaxTheme;
35use ui::{ScrollAxes, Scrollbars, Tooltip, WithScrollbar, prelude::*};
36use util::ResultExt;
37
38use crate::parser::CodeBlockKind;
39
40/// A callback function that can be used to customize the style of links based on the destination URL.
41/// If the callback returns `None`, the default link style will be used.
42type LinkStyleCallback = Rc<dyn Fn(&str, &App) -> Option<TextStyleRefinement>>;
43
44/// Defines custom style refinements for each heading level (H1-H6)
45#[derive(Clone, Default)]
46pub struct HeadingLevelStyles {
47 pub h1: Option<TextStyleRefinement>,
48 pub h2: Option<TextStyleRefinement>,
49 pub h3: Option<TextStyleRefinement>,
50 pub h4: Option<TextStyleRefinement>,
51 pub h5: Option<TextStyleRefinement>,
52 pub h6: Option<TextStyleRefinement>,
53}
54
55#[derive(Clone)]
56pub struct MarkdownStyle {
57 pub base_text_style: TextStyle,
58 pub container_style: StyleRefinement,
59 pub code_block: StyleRefinement,
60 pub code_block_overflow_x_scroll: bool,
61 pub inline_code: TextStyleRefinement,
62 pub block_quote: TextStyleRefinement,
63 pub link: TextStyleRefinement,
64 pub link_callback: Option<LinkStyleCallback>,
65 pub rule_color: Hsla,
66 pub block_quote_border_color: Hsla,
67 pub syntax: Arc<SyntaxTheme>,
68 pub selection_background_color: Hsla,
69 pub heading: StyleRefinement,
70 pub heading_level_styles: Option<HeadingLevelStyles>,
71 pub height_is_multiple_of_line_height: bool,
72 pub prevent_mouse_interaction: bool,
73 pub table_columns_min_size: bool,
74}
75
76impl Default for MarkdownStyle {
77 fn default() -> Self {
78 Self {
79 base_text_style: Default::default(),
80 container_style: Default::default(),
81 code_block: Default::default(),
82 code_block_overflow_x_scroll: false,
83 inline_code: Default::default(),
84 block_quote: Default::default(),
85 link: Default::default(),
86 link_callback: None,
87 rule_color: Default::default(),
88 block_quote_border_color: Default::default(),
89 syntax: Arc::new(SyntaxTheme::default()),
90 selection_background_color: Default::default(),
91 heading: Default::default(),
92 heading_level_styles: None,
93 height_is_multiple_of_line_height: false,
94 prevent_mouse_interaction: false,
95 table_columns_min_size: false,
96 }
97 }
98}
99
100pub struct Markdown {
101 source: SharedString,
102 selection: Selection,
103 pressed_link: Option<RenderedLink>,
104 autoscroll_request: Option<usize>,
105 parsed_markdown: ParsedMarkdown,
106 images_by_source_offset: HashMap<usize, Arc<Image>>,
107 should_reparse: bool,
108 pending_parse: Option<Task<()>>,
109 focus_handle: FocusHandle,
110 language_registry: Option<Arc<LanguageRegistry>>,
111 fallback_code_block_language: Option<LanguageName>,
112 options: Options,
113 copied_code_blocks: HashSet<ElementId>,
114 code_block_scroll_handles: HashMap<usize, ScrollHandle>,
115}
116
117struct Options {
118 parse_links_only: bool,
119}
120
121pub enum CodeBlockRenderer {
122 Default {
123 copy_button: bool,
124 copy_button_on_hover: bool,
125 border: bool,
126 },
127 Custom {
128 render: CodeBlockRenderFn,
129 /// A function that can modify the parent container after the code block
130 /// content has been appended as a child element.
131 transform: Option<CodeBlockTransformFn>,
132 },
133}
134
135pub type CodeBlockRenderFn = Arc<
136 dyn Fn(
137 &CodeBlockKind,
138 &ParsedMarkdown,
139 Range<usize>,
140 CodeBlockMetadata,
141 &mut Window,
142 &App,
143 ) -> Div,
144>;
145
146pub type CodeBlockTransformFn =
147 Arc<dyn Fn(AnyDiv, Range<usize>, CodeBlockMetadata, &mut Window, &App) -> AnyDiv>;
148
149actions!(
150 markdown,
151 [
152 /// Copies the selected text to the clipboard.
153 Copy,
154 /// Copies the selected text as markdown to the clipboard.
155 CopyAsMarkdown
156 ]
157);
158
159impl Markdown {
160 pub fn new(
161 source: SharedString,
162 language_registry: Option<Arc<LanguageRegistry>>,
163 fallback_code_block_language: Option<LanguageName>,
164 cx: &mut Context<Self>,
165 ) -> Self {
166 let focus_handle = cx.focus_handle();
167 let mut this = Self {
168 source,
169 selection: Selection::default(),
170 pressed_link: None,
171 autoscroll_request: None,
172 should_reparse: false,
173 images_by_source_offset: Default::default(),
174 parsed_markdown: ParsedMarkdown::default(),
175 pending_parse: None,
176 focus_handle,
177 language_registry,
178 fallback_code_block_language,
179 options: Options {
180 parse_links_only: false,
181 },
182 copied_code_blocks: HashSet::default(),
183 code_block_scroll_handles: HashMap::default(),
184 };
185 this.parse(cx);
186 this
187 }
188
189 pub fn new_text(source: SharedString, cx: &mut Context<Self>) -> Self {
190 let focus_handle = cx.focus_handle();
191 let mut this = Self {
192 source,
193 selection: Selection::default(),
194 pressed_link: None,
195 autoscroll_request: None,
196 should_reparse: false,
197 parsed_markdown: ParsedMarkdown::default(),
198 images_by_source_offset: Default::default(),
199 pending_parse: None,
200 focus_handle,
201 language_registry: None,
202 fallback_code_block_language: None,
203 options: Options {
204 parse_links_only: true,
205 },
206 copied_code_blocks: HashSet::default(),
207 code_block_scroll_handles: HashMap::default(),
208 };
209 this.parse(cx);
210 this
211 }
212
213 fn code_block_scroll_handle(&mut self, id: usize) -> ScrollHandle {
214 self.code_block_scroll_handles
215 .entry(id)
216 .or_insert_with(ScrollHandle::new)
217 .clone()
218 }
219
220 fn retain_code_block_scroll_handles(&mut self, ids: &HashSet<usize>) {
221 self.code_block_scroll_handles
222 .retain(|id, _| ids.contains(id));
223 }
224
225 fn clear_code_block_scroll_handles(&mut self) {
226 self.code_block_scroll_handles.clear();
227 }
228
229 pub fn is_parsing(&self) -> bool {
230 self.pending_parse.is_some()
231 }
232
233 pub fn source(&self) -> &str {
234 &self.source
235 }
236
237 pub fn append(&mut self, text: &str, cx: &mut Context<Self>) {
238 self.source = SharedString::new(self.source.to_string() + text);
239 self.parse(cx);
240 }
241
242 pub fn replace(&mut self, source: impl Into<SharedString>, cx: &mut Context<Self>) {
243 self.source = source.into();
244 self.parse(cx);
245 }
246
247 pub fn reset(&mut self, source: SharedString, cx: &mut Context<Self>) {
248 if source == self.source() {
249 return;
250 }
251 self.source = source;
252 self.selection = Selection::default();
253 self.autoscroll_request = None;
254 self.pending_parse = None;
255 self.should_reparse = false;
256 // Don't clear parsed_markdown here - keep existing content visible until new parse completes
257 self.parse(cx);
258 }
259
260 #[cfg(any(test, feature = "test-support"))]
261 pub fn parsed_markdown(&self) -> &ParsedMarkdown {
262 &self.parsed_markdown
263 }
264
265 pub fn escape(s: &str) -> Cow<'_, str> {
266 // Valid to use bytes since multi-byte UTF-8 doesn't use ASCII chars.
267 let count = s
268 .bytes()
269 .filter(|c| *c == b'\n' || c.is_ascii_punctuation())
270 .count();
271 if count > 0 {
272 let mut output = String::with_capacity(s.len() + count);
273 let mut is_newline = false;
274 for c in s.chars() {
275 if is_newline && c == ' ' {
276 continue;
277 }
278 is_newline = c == '\n';
279 if c == '\n' {
280 output.push('\n')
281 } else if c.is_ascii_punctuation() {
282 output.push('\\')
283 }
284 output.push(c)
285 }
286 output.into()
287 } else {
288 s.into()
289 }
290 }
291
292 fn copy(&self, text: &RenderedText, _: &mut Window, cx: &mut Context<Self>) {
293 if self.selection.end <= self.selection.start {
294 return;
295 }
296 let text = text.text_for_range(self.selection.start..self.selection.end);
297 cx.write_to_clipboard(ClipboardItem::new_string(text));
298 }
299
300 fn copy_as_markdown(&self, _: &mut Window, cx: &mut Context<Self>) {
301 if self.selection.end <= self.selection.start {
302 return;
303 }
304 let text = self.source[self.selection.start..self.selection.end].to_string();
305 cx.write_to_clipboard(ClipboardItem::new_string(text));
306 }
307
308 fn parse(&mut self, cx: &mut Context<Self>) {
309 if self.source.is_empty() {
310 return;
311 }
312
313 if self.pending_parse.is_some() {
314 self.should_reparse = true;
315 return;
316 }
317 self.should_reparse = false;
318 self.pending_parse = Some(self.start_background_parse(cx));
319 }
320
321 fn start_background_parse(&self, cx: &Context<Self>) -> Task<()> {
322 let source = self.source.clone();
323 let should_parse_links_only = self.options.parse_links_only;
324 let language_registry = self.language_registry.clone();
325 let fallback = self.fallback_code_block_language.clone();
326
327 let parsed = cx.background_spawn(async move {
328 if should_parse_links_only {
329 return (
330 ParsedMarkdown {
331 events: Arc::from(parse_links_only(source.as_ref())),
332 source,
333 languages_by_name: TreeMap::default(),
334 languages_by_path: TreeMap::default(),
335 },
336 Default::default(),
337 );
338 }
339
340 let (events, language_names, paths) = parse_markdown(&source);
341 let mut images_by_source_offset = HashMap::default();
342 let mut languages_by_name = TreeMap::default();
343 let mut languages_by_path = TreeMap::default();
344 if let Some(registry) = language_registry.as_ref() {
345 for name in language_names {
346 let language = if !name.is_empty() {
347 registry.language_for_name_or_extension(&name).left_future()
348 } else if let Some(fallback) = &fallback {
349 registry.language_for_name(fallback.as_ref()).right_future()
350 } else {
351 continue;
352 };
353 if let Ok(language) = language.await {
354 languages_by_name.insert(name, language);
355 }
356 }
357
358 for path in paths {
359 if let Ok(language) = registry
360 .load_language_for_file_path(Path::new(path.as_ref()))
361 .await
362 {
363 languages_by_path.insert(path, language);
364 }
365 }
366 }
367
368 for (range, event) in &events {
369 if let MarkdownEvent::Start(MarkdownTag::Image { dest_url, .. }) = event
370 && let Some(data_url) = dest_url.strip_prefix("data:")
371 {
372 let Some((mime_info, data)) = data_url.split_once(',') else {
373 continue;
374 };
375 let Some((mime_type, encoding)) = mime_info.split_once(';') else {
376 continue;
377 };
378 let Some(format) = ImageFormat::from_mime_type(mime_type) else {
379 continue;
380 };
381 let is_base64 = encoding == "base64";
382 if is_base64
383 && let Some(bytes) = base64::prelude::BASE64_STANDARD
384 .decode(data)
385 .log_with_level(Level::Debug)
386 {
387 let image = Arc::new(Image::from_bytes(format, bytes));
388 images_by_source_offset.insert(range.start, image);
389 }
390 }
391 }
392
393 (
394 ParsedMarkdown {
395 source,
396 events: Arc::from(events),
397 languages_by_name,
398 languages_by_path,
399 },
400 images_by_source_offset,
401 )
402 });
403
404 cx.spawn(async move |this, cx| {
405 let (parsed, images_by_source_offset) = parsed.await;
406
407 this.update(cx, |this, cx| {
408 this.parsed_markdown = parsed;
409 this.images_by_source_offset = images_by_source_offset;
410 this.pending_parse.take();
411 if this.should_reparse {
412 this.parse(cx);
413 }
414 cx.refresh_windows();
415 })
416 .ok();
417 })
418 }
419}
420
421impl Focusable for Markdown {
422 fn focus_handle(&self, _cx: &App) -> FocusHandle {
423 self.focus_handle.clone()
424 }
425}
426
427#[derive(Debug, Default, Clone)]
428enum SelectMode {
429 #[default]
430 Character,
431 Word(Range<usize>),
432 Line(Range<usize>),
433 All,
434}
435
436#[derive(Clone, Default)]
437struct Selection {
438 start: usize,
439 end: usize,
440 reversed: bool,
441 pending: bool,
442 mode: SelectMode,
443}
444
445impl Selection {
446 fn set_head(&mut self, head: usize, rendered_text: &RenderedText) {
447 match &self.mode {
448 SelectMode::Character => {
449 if head < self.tail() {
450 if !self.reversed {
451 self.end = self.start;
452 self.reversed = true;
453 }
454 self.start = head;
455 } else {
456 if self.reversed {
457 self.start = self.end;
458 self.reversed = false;
459 }
460 self.end = head;
461 }
462 }
463 SelectMode::Word(original_range) | SelectMode::Line(original_range) => {
464 let head_range = if matches!(self.mode, SelectMode::Word(_)) {
465 rendered_text.surrounding_word_range(head)
466 } else {
467 rendered_text.surrounding_line_range(head)
468 };
469
470 if head < original_range.start {
471 self.start = head_range.start;
472 self.end = original_range.end;
473 self.reversed = true;
474 } else if head >= original_range.end {
475 self.start = original_range.start;
476 self.end = head_range.end;
477 self.reversed = false;
478 } else {
479 self.start = original_range.start;
480 self.end = original_range.end;
481 self.reversed = false;
482 }
483 }
484 SelectMode::All => {
485 self.start = 0;
486 self.end = rendered_text
487 .lines
488 .last()
489 .map(|line| line.source_end)
490 .unwrap_or(0);
491 self.reversed = false;
492 }
493 }
494 }
495
496 fn tail(&self) -> usize {
497 if self.reversed { self.end } else { self.start }
498 }
499}
500
501#[derive(Debug, Clone, Default)]
502pub struct ParsedMarkdown {
503 pub source: SharedString,
504 pub events: Arc<[(Range<usize>, MarkdownEvent)]>,
505 pub languages_by_name: TreeMap<SharedString, Arc<Language>>,
506 pub languages_by_path: TreeMap<Arc<str>, Arc<Language>>,
507}
508
509impl ParsedMarkdown {
510 pub fn source(&self) -> &SharedString {
511 &self.source
512 }
513
514 pub fn events(&self) -> &Arc<[(Range<usize>, MarkdownEvent)]> {
515 &self.events
516 }
517}
518
519pub struct MarkdownElement {
520 markdown: Entity<Markdown>,
521 style: MarkdownStyle,
522 code_block_renderer: CodeBlockRenderer,
523 on_url_click: Option<Box<dyn Fn(SharedString, &mut Window, &mut App)>>,
524}
525
526impl MarkdownElement {
527 pub fn new(markdown: Entity<Markdown>, style: MarkdownStyle) -> Self {
528 Self {
529 markdown,
530 style,
531 code_block_renderer: CodeBlockRenderer::Default {
532 copy_button: true,
533 copy_button_on_hover: false,
534 border: false,
535 },
536 on_url_click: None,
537 }
538 }
539
540 #[cfg(any(test, feature = "test-support"))]
541 pub fn rendered_text(
542 markdown: Entity<Markdown>,
543 cx: &mut gpui::VisualTestContext,
544 style: impl FnOnce(&Window, &App) -> MarkdownStyle,
545 ) -> String {
546 use gpui::size;
547
548 let (text, _) = cx.draw(
549 Default::default(),
550 size(px(600.0), px(600.0)),
551 |window, cx| Self::new(markdown, style(window, cx)),
552 );
553 text.text
554 .lines
555 .iter()
556 .map(|line| line.layout.wrapped_text())
557 .collect::<Vec<_>>()
558 .join("\n")
559 }
560
561 pub fn code_block_renderer(mut self, variant: CodeBlockRenderer) -> Self {
562 self.code_block_renderer = variant;
563 self
564 }
565
566 pub fn on_url_click(
567 mut self,
568 handler: impl Fn(SharedString, &mut Window, &mut App) + 'static,
569 ) -> Self {
570 self.on_url_click = Some(Box::new(handler));
571 self
572 }
573
574 fn paint_selection(
575 &self,
576 bounds: Bounds<Pixels>,
577 rendered_text: &RenderedText,
578 window: &mut Window,
579 cx: &mut App,
580 ) {
581 let selection = self.markdown.read(cx).selection.clone();
582 let selection_start = rendered_text.position_for_source_index(selection.start);
583 let selection_end = rendered_text.position_for_source_index(selection.end);
584 if let Some(((start_position, start_line_height), (end_position, end_line_height))) =
585 selection_start.zip(selection_end)
586 {
587 if start_position.y == end_position.y {
588 window.paint_quad(quad(
589 Bounds::from_corners(
590 start_position,
591 point(end_position.x, end_position.y + end_line_height),
592 ),
593 Pixels::ZERO,
594 self.style.selection_background_color,
595 Edges::default(),
596 Hsla::transparent_black(),
597 BorderStyle::default(),
598 ));
599 } else {
600 window.paint_quad(quad(
601 Bounds::from_corners(
602 start_position,
603 point(bounds.right(), start_position.y + start_line_height),
604 ),
605 Pixels::ZERO,
606 self.style.selection_background_color,
607 Edges::default(),
608 Hsla::transparent_black(),
609 BorderStyle::default(),
610 ));
611
612 if end_position.y > start_position.y + start_line_height {
613 window.paint_quad(quad(
614 Bounds::from_corners(
615 point(bounds.left(), start_position.y + start_line_height),
616 point(bounds.right(), end_position.y),
617 ),
618 Pixels::ZERO,
619 self.style.selection_background_color,
620 Edges::default(),
621 Hsla::transparent_black(),
622 BorderStyle::default(),
623 ));
624 }
625
626 window.paint_quad(quad(
627 Bounds::from_corners(
628 point(bounds.left(), end_position.y),
629 point(end_position.x, end_position.y + end_line_height),
630 ),
631 Pixels::ZERO,
632 self.style.selection_background_color,
633 Edges::default(),
634 Hsla::transparent_black(),
635 BorderStyle::default(),
636 ));
637 }
638 }
639 }
640
641 fn paint_mouse_listeners(
642 &mut self,
643 hitbox: &Hitbox,
644 rendered_text: &RenderedText,
645 window: &mut Window,
646 cx: &mut App,
647 ) {
648 if self.style.prevent_mouse_interaction {
649 return;
650 }
651
652 let is_hovering_link = hitbox.is_hovered(window)
653 && !self.markdown.read(cx).selection.pending
654 && rendered_text
655 .link_for_position(window.mouse_position())
656 .is_some();
657
658 if !self.style.prevent_mouse_interaction {
659 if is_hovering_link {
660 window.set_cursor_style(CursorStyle::PointingHand, hitbox);
661 } else {
662 window.set_cursor_style(CursorStyle::IBeam, hitbox);
663 }
664 }
665
666 let on_open_url = self.on_url_click.take();
667
668 self.on_mouse_event(window, cx, {
669 let rendered_text = rendered_text.clone();
670 let hitbox = hitbox.clone();
671 move |markdown, event: &MouseDownEvent, phase, window, cx| {
672 if hitbox.is_hovered(window) {
673 if phase.bubble() {
674 if let Some(link) = rendered_text.link_for_position(event.position) {
675 markdown.pressed_link = Some(link.clone());
676 } else {
677 let source_index =
678 match rendered_text.source_index_for_position(event.position) {
679 Ok(ix) | Err(ix) => ix,
680 };
681 let (range, mode) = match event.click_count {
682 1 => {
683 let range = source_index..source_index;
684 (range, SelectMode::Character)
685 }
686 2 => {
687 let range = rendered_text.surrounding_word_range(source_index);
688 (range.clone(), SelectMode::Word(range))
689 }
690 3 => {
691 let range = rendered_text.surrounding_line_range(source_index);
692 (range.clone(), SelectMode::Line(range))
693 }
694 _ => {
695 let range = 0..rendered_text
696 .lines
697 .last()
698 .map(|line| line.source_end)
699 .unwrap_or(0);
700 (range, SelectMode::All)
701 }
702 };
703 markdown.selection = Selection {
704 start: range.start,
705 end: range.end,
706 reversed: false,
707 pending: true,
708 mode,
709 };
710 window.focus(&markdown.focus_handle, cx);
711 }
712
713 window.prevent_default();
714 cx.notify();
715 }
716 } else if phase.capture() {
717 markdown.selection = Selection::default();
718 markdown.pressed_link = None;
719 cx.notify();
720 }
721 }
722 });
723 self.on_mouse_event(window, cx, {
724 let rendered_text = rendered_text.clone();
725 let hitbox = hitbox.clone();
726 let was_hovering_link = is_hovering_link;
727 move |markdown, event: &MouseMoveEvent, phase, window, cx| {
728 if phase.capture() {
729 return;
730 }
731
732 if markdown.selection.pending {
733 let source_index = match rendered_text.source_index_for_position(event.position)
734 {
735 Ok(ix) | Err(ix) => ix,
736 };
737 markdown.selection.set_head(source_index, &rendered_text);
738 markdown.autoscroll_request = Some(source_index);
739 cx.notify();
740 } else {
741 let is_hovering_link = hitbox.is_hovered(window)
742 && rendered_text.link_for_position(event.position).is_some();
743 if is_hovering_link != was_hovering_link {
744 cx.notify();
745 }
746 }
747 }
748 });
749 self.on_mouse_event(window, cx, {
750 let rendered_text = rendered_text.clone();
751 move |markdown, event: &MouseUpEvent, phase, window, cx| {
752 if phase.bubble() {
753 if let Some(pressed_link) = markdown.pressed_link.take()
754 && Some(&pressed_link) == rendered_text.link_for_position(event.position)
755 {
756 if let Some(open_url) = on_open_url.as_ref() {
757 open_url(pressed_link.destination_url, window, cx);
758 } else {
759 cx.open_url(&pressed_link.destination_url);
760 }
761 }
762 } else if markdown.selection.pending {
763 markdown.selection.pending = false;
764 #[cfg(any(target_os = "linux", target_os = "freebsd"))]
765 {
766 let text = rendered_text
767 .text_for_range(markdown.selection.start..markdown.selection.end);
768 cx.write_to_primary(ClipboardItem::new_string(text))
769 }
770 cx.notify();
771 }
772 }
773 });
774 }
775
776 fn autoscroll(
777 &self,
778 rendered_text: &RenderedText,
779 window: &mut Window,
780 cx: &mut App,
781 ) -> Option<()> {
782 let autoscroll_index = self
783 .markdown
784 .update(cx, |markdown, _| markdown.autoscroll_request.take())?;
785 let (position, line_height) = rendered_text.position_for_source_index(autoscroll_index)?;
786
787 let text_style = self.style.base_text_style.clone();
788 let font_id = window.text_system().resolve_font(&text_style.font());
789 let font_size = text_style.font_size.to_pixels(window.rem_size());
790 let em_width = window.text_system().em_width(font_id, font_size).unwrap();
791 window.request_autoscroll(Bounds::from_corners(
792 point(position.x - 3. * em_width, position.y - 3. * line_height),
793 point(position.x + 3. * em_width, position.y + 3. * line_height),
794 ));
795 Some(())
796 }
797
798 fn on_mouse_event<T: MouseEvent>(
799 &self,
800 window: &mut Window,
801 _cx: &mut App,
802 mut f: impl 'static
803 + FnMut(&mut Markdown, &T, DispatchPhase, &mut Window, &mut Context<Markdown>),
804 ) {
805 window.on_mouse_event({
806 let markdown = self.markdown.downgrade();
807 move |event, phase, window, cx| {
808 markdown
809 .update(cx, |markdown, cx| f(markdown, event, phase, window, cx))
810 .log_err();
811 }
812 });
813 }
814}
815
816impl Styled for MarkdownElement {
817 fn style(&mut self) -> &mut StyleRefinement {
818 &mut self.style.container_style
819 }
820}
821
822impl Element for MarkdownElement {
823 type RequestLayoutState = RenderedMarkdown;
824 type PrepaintState = Hitbox;
825
826 fn id(&self) -> Option<ElementId> {
827 None
828 }
829
830 fn source_location(&self) -> Option<&'static core::panic::Location<'static>> {
831 None
832 }
833
834 fn request_layout(
835 &mut self,
836 _id: Option<&GlobalElementId>,
837 _inspector_id: Option<&gpui::InspectorElementId>,
838 window: &mut Window,
839 cx: &mut App,
840 ) -> (gpui::LayoutId, Self::RequestLayoutState) {
841 let mut builder = MarkdownElementBuilder::new(
842 &self.style.container_style,
843 self.style.base_text_style.clone(),
844 self.style.syntax.clone(),
845 );
846 let (parsed_markdown, images) = {
847 let markdown = self.markdown.read(cx);
848 (
849 markdown.parsed_markdown.clone(),
850 markdown.images_by_source_offset.clone(),
851 )
852 };
853 let markdown_end = if let Some(last) = parsed_markdown.events.last() {
854 last.0.end
855 } else {
856 0
857 };
858 let mut code_block_ids = HashSet::default();
859
860 let mut current_img_block_range: Option<Range<usize>> = None;
861 for (index, (range, event)) in parsed_markdown.events.iter().enumerate() {
862 // Skip alt text for images that rendered
863 if let Some(current_img_block_range) = ¤t_img_block_range
864 && current_img_block_range.end > range.end
865 {
866 continue;
867 }
868
869 match event {
870 MarkdownEvent::Start(tag) => {
871 match tag {
872 MarkdownTag::Image { .. } => {
873 if let Some(image) = images.get(&range.start) {
874 current_img_block_range = Some(range.clone());
875 builder.modify_current_div(|el| {
876 el.items_center()
877 .flex()
878 .flex_row()
879 .child(img(image.clone()))
880 });
881 }
882 }
883 MarkdownTag::Paragraph => {
884 builder.push_div(
885 div().when(!self.style.height_is_multiple_of_line_height, |el| {
886 el.mb_2().line_height(rems(1.3))
887 }),
888 range,
889 markdown_end,
890 );
891 }
892 MarkdownTag::Heading { level, .. } => {
893 let mut heading = div().mb_2();
894
895 heading = apply_heading_style(
896 heading,
897 *level,
898 self.style.heading_level_styles.as_ref(),
899 );
900
901 heading.style().refine(&self.style.heading);
902
903 let text_style = self.style.heading.text_style().clone();
904
905 builder.push_text_style(text_style);
906 builder.push_div(heading, range, markdown_end);
907 }
908 MarkdownTag::BlockQuote => {
909 builder.push_text_style(self.style.block_quote.clone());
910 builder.push_div(
911 div()
912 .pl_4()
913 .mb_2()
914 .border_l_4()
915 .border_color(self.style.block_quote_border_color),
916 range,
917 markdown_end,
918 );
919 }
920 MarkdownTag::CodeBlock { kind, .. } => {
921 let language = match kind {
922 CodeBlockKind::Fenced => None,
923 CodeBlockKind::FencedLang(language) => {
924 parsed_markdown.languages_by_name.get(language).cloned()
925 }
926 CodeBlockKind::FencedSrc(path_range) => parsed_markdown
927 .languages_by_path
928 .get(&path_range.path)
929 .cloned(),
930 _ => None,
931 };
932
933 let is_indented = matches!(kind, CodeBlockKind::Indented);
934 let scroll_handle = if self.style.code_block_overflow_x_scroll {
935 code_block_ids.insert(range.start);
936 Some(self.markdown.update(cx, |markdown, _| {
937 markdown.code_block_scroll_handle(range.start)
938 }))
939 } else {
940 None
941 };
942
943 match (&self.code_block_renderer, is_indented) {
944 (CodeBlockRenderer::Default { .. }, _) | (_, true) => {
945 // This is a parent container that we can position the copy button inside.
946 let parent_container =
947 div().group("code_block").relative().w_full();
948
949 let mut parent_container: AnyDiv = if let Some(scroll_handle) =
950 scroll_handle.as_ref()
951 {
952 let scrollbars = Scrollbars::new(ScrollAxes::Horizontal)
953 .id(("markdown-code-block-scrollbar", range.start))
954 .tracked_scroll_handle(scroll_handle)
955 .with_track_along(
956 ScrollAxes::Horizontal,
957 cx.theme().colors().editor_background,
958 )
959 .notify_content();
960
961 parent_container
962 .rounded_lg()
963 .custom_scrollbars(scrollbars, window, cx)
964 .into()
965 } else {
966 parent_container.into()
967 };
968
969 if let CodeBlockRenderer::Default { border: true, .. } =
970 &self.code_block_renderer
971 {
972 parent_container = parent_container
973 .rounded_md()
974 .border_1()
975 .border_color(cx.theme().colors().border_variant);
976 }
977
978 parent_container.style().refine(&self.style.code_block);
979 builder.push_div(parent_container, range, markdown_end);
980
981 let code_block = div()
982 .id(("code-block", range.start))
983 .rounded_lg()
984 .map(|mut code_block| {
985 if let Some(scroll_handle) = scroll_handle.as_ref() {
986 code_block.style().restrict_scroll_to_axis =
987 Some(true);
988 code_block
989 .flex()
990 .overflow_x_scroll()
991 .track_scroll(scroll_handle)
992 } else {
993 code_block.w_full()
994 }
995 });
996
997 builder.push_text_style(self.style.code_block.text.to_owned());
998 builder.push_code_block(language);
999 builder.push_div(code_block, range, markdown_end);
1000 }
1001 (CodeBlockRenderer::Custom { .. }, _) => {}
1002 }
1003 }
1004 MarkdownTag::HtmlBlock => builder.push_div(div(), range, markdown_end),
1005 MarkdownTag::List(bullet_index) => {
1006 builder.push_list(*bullet_index);
1007 builder.push_div(div().pl_2p5(), range, markdown_end);
1008 }
1009 MarkdownTag::Item => {
1010 let bullet = if let Some((_, MarkdownEvent::TaskListMarker(checked))) =
1011 parsed_markdown.events.get(index.saturating_add(1))
1012 {
1013 let source = &parsed_markdown.source()[range.clone()];
1014
1015 Checkbox::new(
1016 ElementId::Name(source.to_string().into()),
1017 if *checked {
1018 ToggleState::Selected
1019 } else {
1020 ToggleState::Unselected
1021 },
1022 )
1023 .fill()
1024 .visualization_only(true)
1025 .into_any_element()
1026 } else if let Some(bullet_index) = builder.next_bullet_index() {
1027 div().child(format!("{}.", bullet_index)).into_any_element()
1028 } else {
1029 div().child("•").into_any_element()
1030 };
1031 builder.push_div(
1032 div()
1033 .when(!self.style.height_is_multiple_of_line_height, |el| {
1034 el.mb_1().gap_1().line_height(rems(1.3))
1035 })
1036 .h_flex()
1037 .items_start()
1038 .child(bullet),
1039 range,
1040 markdown_end,
1041 );
1042 // Without `w_0`, text doesn't wrap to the width of the container.
1043 builder.push_div(div().flex_1().w_0(), range, markdown_end);
1044 }
1045 MarkdownTag::Emphasis => builder.push_text_style(TextStyleRefinement {
1046 font_style: Some(FontStyle::Italic),
1047 ..Default::default()
1048 }),
1049 MarkdownTag::Strong => builder.push_text_style(TextStyleRefinement {
1050 font_weight: Some(FontWeight::BOLD),
1051 ..Default::default()
1052 }),
1053 MarkdownTag::Strikethrough => {
1054 builder.push_text_style(TextStyleRefinement {
1055 strikethrough: Some(StrikethroughStyle {
1056 thickness: px(1.),
1057 color: None,
1058 }),
1059 ..Default::default()
1060 })
1061 }
1062 MarkdownTag::Link { dest_url, .. } => {
1063 if builder.code_block_stack.is_empty() {
1064 builder.push_link(dest_url.clone(), range.clone());
1065 let style = self
1066 .style
1067 .link_callback
1068 .as_ref()
1069 .and_then(|callback| callback(dest_url, cx))
1070 .unwrap_or_else(|| self.style.link.clone());
1071 builder.push_text_style(style)
1072 }
1073 }
1074 MarkdownTag::MetadataBlock(_) => {}
1075 MarkdownTag::Table(alignments) => {
1076 builder.table.start(alignments.clone());
1077
1078 let column_count = alignments.len();
1079 builder.push_div(
1080 div()
1081 .id(("table", range.start))
1082 .grid()
1083 .grid_cols(column_count as u16)
1084 .when(self.style.table_columns_min_size, |this| {
1085 this.grid_cols_min_content(column_count as u16)
1086 })
1087 .when(!self.style.table_columns_min_size, |this| {
1088 this.grid_cols(column_count as u16)
1089 })
1090 .size_full()
1091 .mb_2()
1092 .border(px(1.5))
1093 .border_color(cx.theme().colors().border)
1094 .rounded_sm()
1095 .overflow_hidden(),
1096 range,
1097 markdown_end,
1098 );
1099 }
1100 MarkdownTag::TableHead => {
1101 builder.table.start_head();
1102 builder.push_text_style(TextStyleRefinement {
1103 font_weight: Some(FontWeight::SEMIBOLD),
1104 ..Default::default()
1105 });
1106 }
1107 MarkdownTag::TableRow => {
1108 builder.table.start_row();
1109 }
1110 MarkdownTag::TableCell => {
1111 let is_header = builder.table.in_head;
1112 let row_index = builder.table.row_index;
1113 let col_index = builder.table.col_index;
1114
1115 builder.push_div(
1116 div()
1117 .when(col_index > 0, |this| this.border_l_1())
1118 .when(row_index > 0, |this| this.border_t_1())
1119 .border_color(cx.theme().colors().border)
1120 .px_1()
1121 .py_0p5()
1122 .when(is_header, |this| {
1123 this.bg(cx.theme().colors().title_bar_background)
1124 })
1125 .when(!is_header && row_index % 2 == 1, |this| {
1126 this.bg(cx.theme().colors().panel_background)
1127 }),
1128 range,
1129 markdown_end,
1130 );
1131 }
1132 _ => log::debug!("unsupported markdown tag {:?}", tag),
1133 }
1134 }
1135 MarkdownEvent::End(tag) => match tag {
1136 MarkdownTagEnd::Image => {
1137 current_img_block_range.take();
1138 }
1139 MarkdownTagEnd::Paragraph => {
1140 builder.pop_div();
1141 }
1142 MarkdownTagEnd::Heading(_) => {
1143 builder.pop_div();
1144 builder.pop_text_style()
1145 }
1146 MarkdownTagEnd::BlockQuote(_kind) => {
1147 builder.pop_text_style();
1148 builder.pop_div()
1149 }
1150 MarkdownTagEnd::CodeBlock => {
1151 builder.trim_trailing_newline();
1152
1153 builder.pop_div();
1154 builder.pop_code_block();
1155 builder.pop_text_style();
1156
1157 if let CodeBlockRenderer::Default {
1158 copy_button: true, ..
1159 } = &self.code_block_renderer
1160 {
1161 builder.modify_current_div(|el| {
1162 let content_range = parser::extract_code_block_content_range(
1163 &parsed_markdown.source()[range.clone()],
1164 );
1165 let content_range = content_range.start + range.start
1166 ..content_range.end + range.start;
1167
1168 let code = parsed_markdown.source()[content_range].to_string();
1169 let codeblock = render_copy_code_block_button(
1170 range.end,
1171 code,
1172 self.markdown.clone(),
1173 cx,
1174 );
1175 el.child(
1176 h_flex()
1177 .w_4()
1178 .absolute()
1179 .top_1p5()
1180 .right_1p5()
1181 .justify_end()
1182 .child(codeblock),
1183 )
1184 });
1185 }
1186
1187 if let CodeBlockRenderer::Default {
1188 copy_button_on_hover: true,
1189 ..
1190 } = &self.code_block_renderer
1191 {
1192 builder.modify_current_div(|el| {
1193 let content_range = parser::extract_code_block_content_range(
1194 &parsed_markdown.source()[range.clone()],
1195 );
1196 let content_range = content_range.start + range.start
1197 ..content_range.end + range.start;
1198
1199 let code = parsed_markdown.source()[content_range].to_string();
1200 let codeblock = render_copy_code_block_button(
1201 range.end,
1202 code,
1203 self.markdown.clone(),
1204 cx,
1205 );
1206 el.child(
1207 h_flex()
1208 .w_4()
1209 .absolute()
1210 .top_0()
1211 .right_0()
1212 .justify_end()
1213 .visible_on_hover("code_block")
1214 .child(codeblock),
1215 )
1216 });
1217 }
1218
1219 // Pop the parent container.
1220 builder.pop_div();
1221 }
1222 MarkdownTagEnd::HtmlBlock => builder.pop_div(),
1223 MarkdownTagEnd::List(_) => {
1224 builder.pop_list();
1225 builder.pop_div();
1226 }
1227 MarkdownTagEnd::Item => {
1228 builder.pop_div();
1229 builder.pop_div();
1230 }
1231 MarkdownTagEnd::Emphasis => builder.pop_text_style(),
1232 MarkdownTagEnd::Strong => builder.pop_text_style(),
1233 MarkdownTagEnd::Strikethrough => builder.pop_text_style(),
1234 MarkdownTagEnd::Link => {
1235 if builder.code_block_stack.is_empty() {
1236 builder.pop_text_style()
1237 }
1238 }
1239 MarkdownTagEnd::Table => {
1240 builder.pop_div();
1241 builder.table.end();
1242 }
1243 MarkdownTagEnd::TableHead => {
1244 builder.pop_text_style();
1245 builder.table.end_head();
1246 }
1247 MarkdownTagEnd::TableRow => {
1248 builder.table.end_row();
1249 }
1250 MarkdownTagEnd::TableCell => {
1251 builder.pop_div();
1252 builder.table.end_cell();
1253 }
1254 _ => log::debug!("unsupported markdown tag end: {:?}", tag),
1255 },
1256 MarkdownEvent::Text => {
1257 builder.push_text(&parsed_markdown.source[range.clone()], range.clone());
1258 }
1259 MarkdownEvent::SubstitutedText(text) => {
1260 builder.push_text(text, range.clone());
1261 }
1262 MarkdownEvent::Code => {
1263 builder.push_text_style(self.style.inline_code.clone());
1264 builder.push_text(&parsed_markdown.source[range.clone()], range.clone());
1265 builder.pop_text_style();
1266 }
1267 MarkdownEvent::Html => {
1268 let html = &parsed_markdown.source[range.clone()];
1269 if html.starts_with("<!--") {
1270 builder.html_comment = true;
1271 }
1272 if html.trim_end().ends_with("-->") {
1273 builder.html_comment = false;
1274 continue;
1275 }
1276 if builder.html_comment {
1277 continue;
1278 }
1279 builder.push_text(html, range.clone());
1280 }
1281 MarkdownEvent::InlineHtml => {
1282 let html = &parsed_markdown.source[range.clone()];
1283 if html.starts_with("<code>") {
1284 builder.push_text_style(self.style.inline_code.clone());
1285 continue;
1286 }
1287 if html.trim_end().starts_with("</code>") {
1288 builder.pop_text_style();
1289 continue;
1290 }
1291 builder.push_text(&parsed_markdown.source[range.clone()], range.clone());
1292 }
1293 MarkdownEvent::Rule => {
1294 builder.push_div(
1295 div()
1296 .border_b_1()
1297 .my_2()
1298 .border_color(self.style.rule_color),
1299 range,
1300 markdown_end,
1301 );
1302 builder.pop_div()
1303 }
1304 MarkdownEvent::SoftBreak => builder.push_text(" ", range.clone()),
1305 MarkdownEvent::HardBreak => builder.push_text("\n", range.clone()),
1306 MarkdownEvent::TaskListMarker(_) => {
1307 // handled inside the `MarkdownTag::Item` case
1308 }
1309 _ => log::debug!("unsupported markdown event {:?}", event),
1310 }
1311 }
1312 if self.style.code_block_overflow_x_scroll {
1313 let code_block_ids = code_block_ids;
1314 self.markdown.update(cx, move |markdown, _| {
1315 markdown.retain_code_block_scroll_handles(&code_block_ids);
1316 });
1317 } else {
1318 self.markdown
1319 .update(cx, |markdown, _| markdown.clear_code_block_scroll_handles());
1320 }
1321 let mut rendered_markdown = builder.build();
1322 let child_layout_id = rendered_markdown.element.request_layout(window, cx);
1323 let layout_id = window.request_layout(gpui::Style::default(), [child_layout_id], cx);
1324 (layout_id, rendered_markdown)
1325 }
1326
1327 fn prepaint(
1328 &mut self,
1329 _id: Option<&GlobalElementId>,
1330 _inspector_id: Option<&gpui::InspectorElementId>,
1331 bounds: Bounds<Pixels>,
1332 rendered_markdown: &mut Self::RequestLayoutState,
1333 window: &mut Window,
1334 cx: &mut App,
1335 ) -> Self::PrepaintState {
1336 let focus_handle = self.markdown.read(cx).focus_handle.clone();
1337 window.set_focus_handle(&focus_handle, cx);
1338 window.set_view_id(self.markdown.entity_id());
1339
1340 let hitbox = window.insert_hitbox(bounds, HitboxBehavior::Normal);
1341 rendered_markdown.element.prepaint(window, cx);
1342 self.autoscroll(&rendered_markdown.text, window, cx);
1343 hitbox
1344 }
1345
1346 fn paint(
1347 &mut self,
1348 _id: Option<&GlobalElementId>,
1349 _inspector_id: Option<&gpui::InspectorElementId>,
1350 bounds: Bounds<Pixels>,
1351 rendered_markdown: &mut Self::RequestLayoutState,
1352 hitbox: &mut Self::PrepaintState,
1353 window: &mut Window,
1354 cx: &mut App,
1355 ) {
1356 let mut context = KeyContext::default();
1357 context.add("Markdown");
1358 window.set_key_context(context);
1359 window.on_action(std::any::TypeId::of::<crate::Copy>(), {
1360 let entity = self.markdown.clone();
1361 let text = rendered_markdown.text.clone();
1362 move |_, phase, window, cx| {
1363 let text = text.clone();
1364 if phase == DispatchPhase::Bubble {
1365 entity.update(cx, move |this, cx| this.copy(&text, window, cx))
1366 }
1367 }
1368 });
1369 window.on_action(std::any::TypeId::of::<crate::CopyAsMarkdown>(), {
1370 let entity = self.markdown.clone();
1371 move |_, phase, window, cx| {
1372 if phase == DispatchPhase::Bubble {
1373 entity.update(cx, move |this, cx| this.copy_as_markdown(window, cx))
1374 }
1375 }
1376 });
1377
1378 self.paint_mouse_listeners(hitbox, &rendered_markdown.text, window, cx);
1379 rendered_markdown.element.paint(window, cx);
1380 self.paint_selection(bounds, &rendered_markdown.text, window, cx);
1381 }
1382}
1383
1384fn apply_heading_style(
1385 mut heading: Div,
1386 level: pulldown_cmark::HeadingLevel,
1387 custom_styles: Option<&HeadingLevelStyles>,
1388) -> Div {
1389 heading = match level {
1390 pulldown_cmark::HeadingLevel::H1 => heading.text_3xl(),
1391 pulldown_cmark::HeadingLevel::H2 => heading.text_2xl(),
1392 pulldown_cmark::HeadingLevel::H3 => heading.text_xl(),
1393 pulldown_cmark::HeadingLevel::H4 => heading.text_lg(),
1394 pulldown_cmark::HeadingLevel::H5 => heading.text_base(),
1395 pulldown_cmark::HeadingLevel::H6 => heading.text_sm(),
1396 };
1397
1398 if let Some(styles) = custom_styles {
1399 let style_opt = match level {
1400 pulldown_cmark::HeadingLevel::H1 => &styles.h1,
1401 pulldown_cmark::HeadingLevel::H2 => &styles.h2,
1402 pulldown_cmark::HeadingLevel::H3 => &styles.h3,
1403 pulldown_cmark::HeadingLevel::H4 => &styles.h4,
1404 pulldown_cmark::HeadingLevel::H5 => &styles.h5,
1405 pulldown_cmark::HeadingLevel::H6 => &styles.h6,
1406 };
1407
1408 if let Some(style) = style_opt {
1409 heading.style().text = style.clone();
1410 }
1411 }
1412
1413 heading
1414}
1415
1416fn render_copy_code_block_button(
1417 id: usize,
1418 code: String,
1419 markdown: Entity<Markdown>,
1420 cx: &App,
1421) -> impl IntoElement {
1422 let id = ElementId::named_usize("copy-markdown-code", id);
1423 let was_copied = markdown.read(cx).copied_code_blocks.contains(&id);
1424 IconButton::new(
1425 id.clone(),
1426 if was_copied {
1427 IconName::Check
1428 } else {
1429 IconName::Copy
1430 },
1431 )
1432 .icon_color(Color::Muted)
1433 .icon_size(IconSize::Small)
1434 .style(ButtonStyle::Filled)
1435 .shape(ui::IconButtonShape::Square)
1436 .tooltip(Tooltip::text("Copy"))
1437 .on_click({
1438 let markdown = markdown;
1439 move |_event, _window, cx| {
1440 let id = id.clone();
1441 markdown.update(cx, |this, cx| {
1442 this.copied_code_blocks.insert(id.clone());
1443
1444 cx.write_to_clipboard(ClipboardItem::new_string(code.clone()));
1445
1446 cx.spawn(async move |this, cx| {
1447 cx.background_executor().timer(Duration::from_secs(2)).await;
1448
1449 cx.update(|cx| {
1450 this.update(cx, |this, cx| {
1451 this.copied_code_blocks.remove(&id);
1452 cx.notify();
1453 })
1454 })
1455 .ok();
1456 })
1457 .detach();
1458 });
1459 }
1460 })
1461}
1462
1463impl IntoElement for MarkdownElement {
1464 type Element = Self;
1465
1466 fn into_element(self) -> Self::Element {
1467 self
1468 }
1469}
1470
1471pub enum AnyDiv {
1472 Div(Div),
1473 Stateful(Stateful<Div>),
1474}
1475
1476impl AnyDiv {
1477 fn into_any_element(self) -> AnyElement {
1478 match self {
1479 Self::Div(div) => div.into_any_element(),
1480 Self::Stateful(div) => div.into_any_element(),
1481 }
1482 }
1483}
1484
1485impl From<Div> for AnyDiv {
1486 fn from(value: Div) -> Self {
1487 Self::Div(value)
1488 }
1489}
1490
1491impl From<Stateful<Div>> for AnyDiv {
1492 fn from(value: Stateful<Div>) -> Self {
1493 Self::Stateful(value)
1494 }
1495}
1496
1497impl Styled for AnyDiv {
1498 fn style(&mut self) -> &mut StyleRefinement {
1499 match self {
1500 Self::Div(div) => div.style(),
1501 Self::Stateful(div) => div.style(),
1502 }
1503 }
1504}
1505
1506impl ParentElement for AnyDiv {
1507 fn extend(&mut self, elements: impl IntoIterator<Item = AnyElement>) {
1508 match self {
1509 Self::Div(div) => div.extend(elements),
1510 Self::Stateful(div) => div.extend(elements),
1511 }
1512 }
1513}
1514
1515#[derive(Default)]
1516struct TableState {
1517 alignments: Vec<Alignment>,
1518 in_head: bool,
1519 row_index: usize,
1520 col_index: usize,
1521}
1522
1523impl TableState {
1524 fn start(&mut self, alignments: Vec<Alignment>) {
1525 self.alignments = alignments;
1526 self.in_head = false;
1527 self.row_index = 0;
1528 self.col_index = 0;
1529 }
1530
1531 fn end(&mut self) {
1532 self.alignments.clear();
1533 self.in_head = false;
1534 self.row_index = 0;
1535 self.col_index = 0;
1536 }
1537
1538 fn start_head(&mut self) {
1539 self.in_head = true;
1540 }
1541
1542 fn end_head(&mut self) {
1543 self.in_head = false;
1544 }
1545
1546 fn start_row(&mut self) {
1547 self.col_index = 0;
1548 }
1549
1550 fn end_row(&mut self) {
1551 self.row_index += 1;
1552 }
1553
1554 fn end_cell(&mut self) {
1555 self.col_index += 1;
1556 }
1557}
1558
1559struct MarkdownElementBuilder {
1560 div_stack: Vec<AnyDiv>,
1561 rendered_lines: Vec<RenderedLine>,
1562 pending_line: PendingLine,
1563 rendered_links: Vec<RenderedLink>,
1564 current_source_index: usize,
1565 html_comment: bool,
1566 base_text_style: TextStyle,
1567 text_style_stack: Vec<TextStyleRefinement>,
1568 code_block_stack: Vec<Option<Arc<Language>>>,
1569 list_stack: Vec<ListStackEntry>,
1570 table: TableState,
1571 syntax_theme: Arc<SyntaxTheme>,
1572}
1573
1574#[derive(Default)]
1575struct PendingLine {
1576 text: String,
1577 runs: Vec<TextRun>,
1578 source_mappings: Vec<SourceMapping>,
1579}
1580
1581struct ListStackEntry {
1582 bullet_index: Option<u64>,
1583}
1584
1585impl MarkdownElementBuilder {
1586 fn new(
1587 container_style: &StyleRefinement,
1588 base_text_style: TextStyle,
1589 syntax_theme: Arc<SyntaxTheme>,
1590 ) -> Self {
1591 Self {
1592 div_stack: vec![{
1593 let mut base_div = div();
1594 base_div.style().refine(container_style);
1595 base_div.debug_selector(|| "inner".into()).into()
1596 }],
1597 rendered_lines: Vec::new(),
1598 pending_line: PendingLine::default(),
1599 rendered_links: Vec::new(),
1600 current_source_index: 0,
1601 html_comment: false,
1602 base_text_style,
1603 text_style_stack: Vec::new(),
1604 code_block_stack: Vec::new(),
1605 list_stack: Vec::new(),
1606 table: TableState::default(),
1607 syntax_theme,
1608 }
1609 }
1610
1611 fn push_text_style(&mut self, style: TextStyleRefinement) {
1612 self.text_style_stack.push(style);
1613 }
1614
1615 fn text_style(&self) -> TextStyle {
1616 let mut style = self.base_text_style.clone();
1617 for refinement in &self.text_style_stack {
1618 style.refine(refinement);
1619 }
1620 style
1621 }
1622
1623 fn pop_text_style(&mut self) {
1624 self.text_style_stack.pop();
1625 }
1626
1627 fn push_div(&mut self, div: impl Into<AnyDiv>, range: &Range<usize>, markdown_end: usize) {
1628 let mut div = div.into();
1629 self.flush_text();
1630
1631 if range.start == 0 {
1632 // Remove the top margin on the first element.
1633 div.style().refine(&StyleRefinement {
1634 margin: gpui::EdgesRefinement {
1635 top: Some(Length::Definite(px(0.).into())),
1636 left: None,
1637 right: None,
1638 bottom: None,
1639 },
1640 ..Default::default()
1641 });
1642 }
1643
1644 if range.end == markdown_end {
1645 div.style().refine(&StyleRefinement {
1646 margin: gpui::EdgesRefinement {
1647 top: None,
1648 left: None,
1649 right: None,
1650 bottom: Some(Length::Definite(rems(0.).into())),
1651 },
1652 ..Default::default()
1653 });
1654 }
1655
1656 self.div_stack.push(div);
1657 }
1658
1659 fn modify_current_div(&mut self, f: impl FnOnce(AnyDiv) -> AnyDiv) {
1660 self.flush_text();
1661 if let Some(div) = self.div_stack.pop() {
1662 self.div_stack.push(f(div));
1663 }
1664 }
1665
1666 fn pop_div(&mut self) {
1667 self.flush_text();
1668 let div = self.div_stack.pop().unwrap().into_any_element();
1669 self.div_stack.last_mut().unwrap().extend(iter::once(div));
1670 }
1671
1672 fn push_list(&mut self, bullet_index: Option<u64>) {
1673 self.list_stack.push(ListStackEntry { bullet_index });
1674 }
1675
1676 fn next_bullet_index(&mut self) -> Option<u64> {
1677 self.list_stack.last_mut().and_then(|entry| {
1678 let item_index = entry.bullet_index.as_mut()?;
1679 *item_index += 1;
1680 Some(*item_index - 1)
1681 })
1682 }
1683
1684 fn pop_list(&mut self) {
1685 self.list_stack.pop();
1686 }
1687
1688 fn push_code_block(&mut self, language: Option<Arc<Language>>) {
1689 self.code_block_stack.push(language);
1690 }
1691
1692 fn pop_code_block(&mut self) {
1693 self.code_block_stack.pop();
1694 }
1695
1696 fn push_link(&mut self, destination_url: SharedString, source_range: Range<usize>) {
1697 self.rendered_links.push(RenderedLink {
1698 source_range,
1699 destination_url,
1700 });
1701 }
1702
1703 fn push_text(&mut self, text: &str, source_range: Range<usize>) {
1704 self.pending_line.source_mappings.push(SourceMapping {
1705 rendered_index: self.pending_line.text.len(),
1706 source_index: source_range.start,
1707 });
1708 self.pending_line.text.push_str(text);
1709 self.current_source_index = source_range.end;
1710
1711 if let Some(Some(language)) = self.code_block_stack.last() {
1712 let mut offset = 0;
1713 for (range, highlight_id) in language.highlight_text(&Rope::from(text), 0..text.len()) {
1714 if range.start > offset {
1715 self.pending_line
1716 .runs
1717 .push(self.text_style().to_run(range.start - offset));
1718 }
1719
1720 let mut run_style = self.text_style();
1721 if let Some(highlight) = highlight_id.style(&self.syntax_theme) {
1722 run_style = run_style.highlight(highlight);
1723 }
1724 self.pending_line.runs.push(run_style.to_run(range.len()));
1725 offset = range.end;
1726 }
1727
1728 if offset < text.len() {
1729 self.pending_line
1730 .runs
1731 .push(self.text_style().to_run(text.len() - offset));
1732 }
1733 } else {
1734 self.pending_line
1735 .runs
1736 .push(self.text_style().to_run(text.len()));
1737 }
1738 }
1739
1740 fn trim_trailing_newline(&mut self) {
1741 if self.pending_line.text.ends_with('\n') {
1742 self.pending_line
1743 .text
1744 .truncate(self.pending_line.text.len() - 1);
1745 self.pending_line.runs.last_mut().unwrap().len -= 1;
1746 self.current_source_index -= 1;
1747 }
1748 }
1749
1750 fn flush_text(&mut self) {
1751 let line = mem::take(&mut self.pending_line);
1752 if line.text.is_empty() {
1753 return;
1754 }
1755
1756 let text = StyledText::new(line.text).with_runs(line.runs);
1757 self.rendered_lines.push(RenderedLine {
1758 layout: text.layout().clone(),
1759 source_mappings: line.source_mappings,
1760 source_end: self.current_source_index,
1761 });
1762 self.div_stack.last_mut().unwrap().extend([text.into_any()]);
1763 }
1764
1765 fn build(mut self) -> RenderedMarkdown {
1766 debug_assert_eq!(self.div_stack.len(), 1);
1767 self.flush_text();
1768 RenderedMarkdown {
1769 element: self.div_stack.pop().unwrap().into_any_element(),
1770 text: RenderedText {
1771 lines: self.rendered_lines.into(),
1772 links: self.rendered_links.into(),
1773 },
1774 }
1775 }
1776}
1777
1778struct RenderedLine {
1779 layout: TextLayout,
1780 source_mappings: Vec<SourceMapping>,
1781 source_end: usize,
1782}
1783
1784impl RenderedLine {
1785 fn rendered_index_for_source_index(&self, source_index: usize) -> usize {
1786 if source_index >= self.source_end {
1787 return self.layout.len();
1788 }
1789
1790 let mapping = match self
1791 .source_mappings
1792 .binary_search_by_key(&source_index, |probe| probe.source_index)
1793 {
1794 Ok(ix) => &self.source_mappings[ix],
1795 Err(ix) => &self.source_mappings[ix - 1],
1796 };
1797 mapping.rendered_index + (source_index - mapping.source_index)
1798 }
1799
1800 fn source_index_for_rendered_index(&self, rendered_index: usize) -> usize {
1801 if rendered_index >= self.layout.len() {
1802 return self.source_end;
1803 }
1804
1805 let mapping = match self
1806 .source_mappings
1807 .binary_search_by_key(&rendered_index, |probe| probe.rendered_index)
1808 {
1809 Ok(ix) => &self.source_mappings[ix],
1810 Err(ix) => &self.source_mappings[ix - 1],
1811 };
1812 mapping.source_index + (rendered_index - mapping.rendered_index)
1813 }
1814
1815 fn source_index_for_position(&self, position: Point<Pixels>) -> Result<usize, usize> {
1816 let line_rendered_index;
1817 let out_of_bounds;
1818 match self.layout.index_for_position(position) {
1819 Ok(ix) => {
1820 line_rendered_index = ix;
1821 out_of_bounds = false;
1822 }
1823 Err(ix) => {
1824 line_rendered_index = ix;
1825 out_of_bounds = true;
1826 }
1827 };
1828 let source_index = self.source_index_for_rendered_index(line_rendered_index);
1829 if out_of_bounds {
1830 Err(source_index)
1831 } else {
1832 Ok(source_index)
1833 }
1834 }
1835}
1836
1837#[derive(Copy, Clone, Debug, Default)]
1838struct SourceMapping {
1839 rendered_index: usize,
1840 source_index: usize,
1841}
1842
1843pub struct RenderedMarkdown {
1844 element: AnyElement,
1845 text: RenderedText,
1846}
1847
1848#[derive(Clone)]
1849struct RenderedText {
1850 lines: Rc<[RenderedLine]>,
1851 links: Rc<[RenderedLink]>,
1852}
1853
1854#[derive(Debug, Clone, Eq, PartialEq)]
1855struct RenderedLink {
1856 source_range: Range<usize>,
1857 destination_url: SharedString,
1858}
1859
1860impl RenderedText {
1861 fn source_index_for_position(&self, position: Point<Pixels>) -> Result<usize, usize> {
1862 let mut lines = self.lines.iter().peekable();
1863
1864 while let Some(line) = lines.next() {
1865 let line_bounds = line.layout.bounds();
1866 if position.y > line_bounds.bottom() {
1867 if let Some(next_line) = lines.peek()
1868 && position.y < next_line.layout.bounds().top()
1869 {
1870 return Err(line.source_end);
1871 }
1872
1873 continue;
1874 }
1875
1876 return line.source_index_for_position(position);
1877 }
1878
1879 Err(self.lines.last().map_or(0, |line| line.source_end))
1880 }
1881
1882 fn position_for_source_index(&self, source_index: usize) -> Option<(Point<Pixels>, Pixels)> {
1883 for line in self.lines.iter() {
1884 let line_source_start = line.source_mappings.first().unwrap().source_index;
1885 if source_index < line_source_start {
1886 break;
1887 } else if source_index > line.source_end {
1888 continue;
1889 } else {
1890 let line_height = line.layout.line_height();
1891 let rendered_index_within_line = line.rendered_index_for_source_index(source_index);
1892 let position = line.layout.position_for_index(rendered_index_within_line)?;
1893 return Some((position, line_height));
1894 }
1895 }
1896 None
1897 }
1898
1899 fn surrounding_word_range(&self, source_index: usize) -> Range<usize> {
1900 for line in self.lines.iter() {
1901 if source_index > line.source_end {
1902 continue;
1903 }
1904
1905 let line_rendered_start = line.source_mappings.first().unwrap().rendered_index;
1906 let rendered_index_in_line =
1907 line.rendered_index_for_source_index(source_index) - line_rendered_start;
1908 let text = line.layout.text();
1909 let previous_space = if let Some(idx) = text[0..rendered_index_in_line].rfind(' ') {
1910 idx + ' '.len_utf8()
1911 } else {
1912 0
1913 };
1914 let next_space = if let Some(idx) = text[rendered_index_in_line..].find(' ') {
1915 rendered_index_in_line + idx
1916 } else {
1917 text.len()
1918 };
1919
1920 return line.source_index_for_rendered_index(line_rendered_start + previous_space)
1921 ..line.source_index_for_rendered_index(line_rendered_start + next_space);
1922 }
1923
1924 source_index..source_index
1925 }
1926
1927 fn surrounding_line_range(&self, source_index: usize) -> Range<usize> {
1928 for line in self.lines.iter() {
1929 if source_index > line.source_end {
1930 continue;
1931 }
1932 let line_source_start = line.source_mappings.first().unwrap().source_index;
1933 return line_source_start..line.source_end;
1934 }
1935
1936 source_index..source_index
1937 }
1938
1939 fn text_for_range(&self, range: Range<usize>) -> String {
1940 let mut accumulator = String::new();
1941
1942 for line in self.lines.iter() {
1943 if range.start > line.source_end {
1944 continue;
1945 }
1946 let line_source_start = line.source_mappings.first().unwrap().source_index;
1947 if range.end < line_source_start {
1948 break;
1949 }
1950
1951 let text = line.layout.text();
1952
1953 let start = if range.start < line_source_start {
1954 0
1955 } else {
1956 line.rendered_index_for_source_index(range.start)
1957 };
1958 let end = if range.end > line.source_end {
1959 line.rendered_index_for_source_index(line.source_end)
1960 } else {
1961 line.rendered_index_for_source_index(range.end)
1962 }
1963 .min(text.len());
1964
1965 accumulator.push_str(&text[start..end]);
1966 accumulator.push('\n');
1967 }
1968 // Remove trailing newline
1969 accumulator.pop();
1970 accumulator
1971 }
1972
1973 fn link_for_position(&self, position: Point<Pixels>) -> Option<&RenderedLink> {
1974 let source_index = self.source_index_for_position(position).ok()?;
1975 self.links
1976 .iter()
1977 .find(|link| link.source_range.contains(&source_index))
1978 }
1979}
1980
1981#[cfg(test)]
1982mod tests {
1983 use super::*;
1984 use gpui::{TestAppContext, size};
1985
1986 #[gpui::test]
1987 fn test_mappings(cx: &mut TestAppContext) {
1988 // Formatting.
1989 assert_mappings(
1990 &render_markdown("He*l*lo", cx),
1991 vec![vec![(0, 0), (1, 1), (2, 3), (3, 5), (4, 6), (5, 7)]],
1992 );
1993
1994 // Multiple lines.
1995 assert_mappings(
1996 &render_markdown("Hello\n\nWorld", cx),
1997 vec![
1998 vec![(0, 0), (1, 1), (2, 2), (3, 3), (4, 4), (5, 5)],
1999 vec![(0, 7), (1, 8), (2, 9), (3, 10), (4, 11), (5, 12)],
2000 ],
2001 );
2002
2003 // Multi-byte characters.
2004 assert_mappings(
2005 &render_markdown("αβγ\n\nδεζ", cx),
2006 vec![
2007 vec![(0, 0), (2, 2), (4, 4), (6, 6)],
2008 vec![(0, 8), (2, 10), (4, 12), (6, 14)],
2009 ],
2010 );
2011
2012 // Smart quotes.
2013 assert_mappings(&render_markdown("\"", cx), vec![vec![(0, 0), (3, 1)]]);
2014 assert_mappings(
2015 &render_markdown("\"hey\"", cx),
2016 vec![vec![(0, 0), (3, 1), (4, 2), (5, 3), (6, 4), (9, 5)]],
2017 );
2018
2019 // HTML Comments are ignored
2020 assert_mappings(
2021 &render_markdown(
2022 "<!--\nrdoc-file=string.c\n- str.intern -> symbol\n- str.to_sym -> symbol\n-->\nReturns",
2023 cx,
2024 ),
2025 vec![vec![
2026 (0, 78),
2027 (1, 79),
2028 (2, 80),
2029 (3, 81),
2030 (4, 82),
2031 (5, 83),
2032 (6, 84),
2033 ]],
2034 );
2035 }
2036
2037 fn render_markdown(markdown: &str, cx: &mut TestAppContext) -> RenderedText {
2038 struct TestWindow;
2039
2040 impl Render for TestWindow {
2041 fn render(&mut self, _: &mut Window, _: &mut Context<Self>) -> impl IntoElement {
2042 div()
2043 }
2044 }
2045
2046 let (_, cx) = cx.add_window_view(|_, _| TestWindow);
2047 let markdown = cx.new(|cx| Markdown::new(markdown.to_string().into(), None, None, cx));
2048 cx.run_until_parked();
2049 let (rendered, _) = cx.draw(
2050 Default::default(),
2051 size(px(600.0), px(600.0)),
2052 |_window, _cx| MarkdownElement::new(markdown, MarkdownStyle::default()),
2053 );
2054 rendered.text
2055 }
2056
2057 #[gpui::test]
2058 fn test_surrounding_word_range(cx: &mut TestAppContext) {
2059 let rendered = render_markdown("Hello world tesεζ", cx);
2060
2061 // Test word selection for "Hello"
2062 let word_range = rendered.surrounding_word_range(2); // Simulate click on 'l' in "Hello"
2063 let selected_text = rendered.text_for_range(word_range);
2064 assert_eq!(selected_text, "Hello");
2065
2066 // Test word selection for "world"
2067 let word_range = rendered.surrounding_word_range(7); // Simulate click on 'o' in "world"
2068 let selected_text = rendered.text_for_range(word_range);
2069 assert_eq!(selected_text, "world");
2070
2071 // Test word selection for "tesεζ"
2072 let word_range = rendered.surrounding_word_range(14); // Simulate click on 's' in "tesεζ"
2073 let selected_text = rendered.text_for_range(word_range);
2074 assert_eq!(selected_text, "tesεζ");
2075
2076 // Test word selection at word boundary (space)
2077 let word_range = rendered.surrounding_word_range(5); // Simulate click on space between "Hello" and "world", expect highlighting word to the left
2078 let selected_text = rendered.text_for_range(word_range);
2079 assert_eq!(selected_text, "Hello");
2080 }
2081
2082 #[gpui::test]
2083 fn test_surrounding_line_range(cx: &mut TestAppContext) {
2084 let rendered = render_markdown("First line\n\nSecond line\n\nThird lineεζ", cx);
2085
2086 // Test getting line range for first line
2087 let line_range = rendered.surrounding_line_range(5); // Simulate click somewhere in first line
2088 let selected_text = rendered.text_for_range(line_range);
2089 assert_eq!(selected_text, "First line");
2090
2091 // Test getting line range for second line
2092 let line_range = rendered.surrounding_line_range(13); // Simulate click at beginning in second line
2093 let selected_text = rendered.text_for_range(line_range);
2094 assert_eq!(selected_text, "Second line");
2095
2096 // Test getting line range for third line
2097 let line_range = rendered.surrounding_line_range(37); // Simulate click at end of third line with multi-byte chars
2098 let selected_text = rendered.text_for_range(line_range);
2099 assert_eq!(selected_text, "Third lineεζ");
2100 }
2101
2102 #[gpui::test]
2103 fn test_selection_head_movement(cx: &mut TestAppContext) {
2104 let rendered = render_markdown("Hello world test", cx);
2105
2106 let mut selection = Selection {
2107 start: 5,
2108 end: 5,
2109 reversed: false,
2110 pending: false,
2111 mode: SelectMode::Character,
2112 };
2113
2114 // Test forward selection
2115 selection.set_head(10, &rendered);
2116 assert_eq!(selection.start, 5);
2117 assert_eq!(selection.end, 10);
2118 assert!(!selection.reversed);
2119 assert_eq!(selection.tail(), 5);
2120
2121 // Test backward selection
2122 selection.set_head(2, &rendered);
2123 assert_eq!(selection.start, 2);
2124 assert_eq!(selection.end, 5);
2125 assert!(selection.reversed);
2126 assert_eq!(selection.tail(), 5);
2127
2128 // Test forward selection again from reversed state
2129 selection.set_head(15, &rendered);
2130 assert_eq!(selection.start, 5);
2131 assert_eq!(selection.end, 15);
2132 assert!(!selection.reversed);
2133 assert_eq!(selection.tail(), 5);
2134 }
2135
2136 #[gpui::test]
2137 fn test_word_selection_drag(cx: &mut TestAppContext) {
2138 let rendered = render_markdown("Hello world test", cx);
2139
2140 // Start with a simulated double-click on "world" (index 6-10)
2141 let word_range = rendered.surrounding_word_range(7); // Click on 'o' in "world"
2142 let mut selection = Selection {
2143 start: word_range.start,
2144 end: word_range.end,
2145 reversed: false,
2146 pending: true,
2147 mode: SelectMode::Word(word_range),
2148 };
2149
2150 // Drag forward to "test" - should expand selection to include "test"
2151 selection.set_head(13, &rendered); // Index in "test"
2152 assert_eq!(selection.start, 6); // Start of "world"
2153 assert_eq!(selection.end, 16); // End of "test"
2154 assert!(!selection.reversed);
2155 let selected_text = rendered.text_for_range(selection.start..selection.end);
2156 assert_eq!(selected_text, "world test");
2157
2158 // Drag backward to "Hello" - should expand selection to include "Hello"
2159 selection.set_head(2, &rendered); // Index in "Hello"
2160 assert_eq!(selection.start, 0); // Start of "Hello"
2161 assert_eq!(selection.end, 11); // End of "world" (original selection)
2162 assert!(selection.reversed);
2163 let selected_text = rendered.text_for_range(selection.start..selection.end);
2164 assert_eq!(selected_text, "Hello world");
2165
2166 // Drag back within original word - should revert to original selection
2167 selection.set_head(8, &rendered); // Back within "world"
2168 assert_eq!(selection.start, 6); // Start of "world"
2169 assert_eq!(selection.end, 11); // End of "world"
2170 assert!(!selection.reversed);
2171 let selected_text = rendered.text_for_range(selection.start..selection.end);
2172 assert_eq!(selected_text, "world");
2173 }
2174
2175 #[gpui::test]
2176 fn test_selection_with_markdown_formatting(cx: &mut TestAppContext) {
2177 let rendered = render_markdown(
2178 "This is **bold** text, this is *italic* text, use `code` here",
2179 cx,
2180 );
2181 let word_range = rendered.surrounding_word_range(10); // Inside "bold"
2182 let selected_text = rendered.text_for_range(word_range);
2183 assert_eq!(selected_text, "bold");
2184
2185 let word_range = rendered.surrounding_word_range(32); // Inside "italic"
2186 let selected_text = rendered.text_for_range(word_range);
2187 assert_eq!(selected_text, "italic");
2188
2189 let word_range = rendered.surrounding_word_range(51); // Inside "code"
2190 let selected_text = rendered.text_for_range(word_range);
2191 assert_eq!(selected_text, "code");
2192 }
2193
2194 #[gpui::test]
2195 fn test_all_selection(cx: &mut TestAppContext) {
2196 let rendered = render_markdown("Hello world\n\nThis is a test\n\nwith multiple lines", cx);
2197
2198 let total_length = rendered
2199 .lines
2200 .last()
2201 .map(|line| line.source_end)
2202 .unwrap_or(0);
2203
2204 let mut selection = Selection {
2205 start: 0,
2206 end: total_length,
2207 reversed: false,
2208 pending: true,
2209 mode: SelectMode::All,
2210 };
2211
2212 selection.set_head(5, &rendered); // Try to set head in middle
2213 assert_eq!(selection.start, 0);
2214 assert_eq!(selection.end, total_length);
2215 assert!(!selection.reversed);
2216
2217 selection.set_head(25, &rendered); // Try to set head near end
2218 assert_eq!(selection.start, 0);
2219 assert_eq!(selection.end, total_length);
2220 assert!(!selection.reversed);
2221
2222 let selected_text = rendered.text_for_range(selection.start..selection.end);
2223 assert_eq!(
2224 selected_text,
2225 "Hello world\nThis is a test\nwith multiple lines"
2226 );
2227 }
2228
2229 #[test]
2230 fn test_escape() {
2231 assert_eq!(Markdown::escape("hello `world`"), "hello \\`world\\`");
2232 assert_eq!(
2233 Markdown::escape("hello\n cool world"),
2234 "hello\n\ncool world"
2235 );
2236 }
2237
2238 #[track_caller]
2239 fn assert_mappings(rendered: &RenderedText, expected: Vec<Vec<(usize, usize)>>) {
2240 assert_eq!(rendered.lines.len(), expected.len(), "line count mismatch");
2241 for (line_ix, line_mappings) in expected.into_iter().enumerate() {
2242 let line = &rendered.lines[line_ix];
2243
2244 assert!(
2245 line.source_mappings.windows(2).all(|mappings| {
2246 mappings[0].source_index < mappings[1].source_index
2247 && mappings[0].rendered_index < mappings[1].rendered_index
2248 }),
2249 "line {} has duplicate mappings: {:?}",
2250 line_ix,
2251 line.source_mappings
2252 );
2253
2254 for (rendered_ix, source_ix) in line_mappings {
2255 assert_eq!(
2256 line.source_index_for_rendered_index(rendered_ix),
2257 source_ix,
2258 "line {}, rendered_ix {}",
2259 line_ix,
2260 rendered_ix
2261 );
2262
2263 assert_eq!(
2264 line.rendered_index_for_source_index(source_ix),
2265 rendered_ix,
2266 "line {}, source_ix {}",
2267 line_ix,
2268 source_ix
2269 );
2270 }
2271 }
2272 }
2273}