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https://github.com/zed-industries/zed.git
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Overhaul MultiBuffer::chunks
Co-Authored-By: Nathan Sobo <nathan@zed.dev>
This commit is contained in:
Antonio Scandurra
parent
bcdb4ffd88
commit
5118f27a90
@ -451,11 +451,15 @@ mod tests {
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}
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#[gpui::test(iterations = 100)]
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fn test_random(cx: &mut gpui::MutableAppContext, mut rng: StdRng) {
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fn test_random_tabs(cx: &mut gpui::MutableAppContext, mut rng: StdRng) {
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let tab_size = rng.gen_range(1..=4);
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let len = rng.gen_range(0..30);
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let text = RandomCharIter::new(&mut rng).take(len).collect::<String>();
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let buffer = MultiBuffer::build_simple(&text, cx);
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let buffer = if rng.gen() {
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let text = RandomCharIter::new(&mut rng).take(len).collect::<String>();
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MultiBuffer::build_simple(&text, cx)
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} else {
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MultiBuffer::build_random(rng.gen_range(1..=5), &mut rng, cx)
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};
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let buffer_snapshot = buffer.read(cx).snapshot(cx);
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log::info!("Buffer text: {:?}", buffer_snapshot.text());
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@ -488,13 +492,15 @@ mod tests {
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.chunks_in_range(text.point_to_offset(start.0)..text.point_to_offset(end.0))
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.collect::<String>();
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let expected_summary = TextSummary::from(expected_text.as_str());
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log::info!("slicing {:?}..{:?} (text: {:?})", start, end, text);
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assert_eq!(
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expected_text,
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tabs_snapshot
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.chunks(start..end, None)
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.map(|c| c.text)
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.collect::<String>()
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.collect::<String>(),
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"chunks({:?}..{:?})",
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start,
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end
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);
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let mut actual_summary = tabs_snapshot.text_summary_for_range(start..end);
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@ -113,10 +113,8 @@ struct ExcerptSummary {
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pub struct MultiBufferChunks<'a> {
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range: Range<usize>,
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cursor: Cursor<'a, Excerpt, usize>,
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header_height: u8,
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has_trailing_newline: bool,
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excerpt_chunks: Option<BufferChunks<'a>>,
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excerpts: Cursor<'a, Excerpt, usize>,
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excerpt_chunks: Option<ExcerptChunks<'a>>,
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theme: Option<&'a SyntaxTheme>,
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}
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@ -127,6 +125,12 @@ pub struct MultiBufferBytes<'a> {
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chunk: &'a [u8],
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}
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struct ExcerptChunks<'a> {
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header_height: usize,
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content_chunks: BufferChunks<'a>,
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footer_height: usize,
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}
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struct ExcerptBytes<'a> {
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header_height: usize,
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content_bytes: language::rope::Bytes<'a>,
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@ -1039,16 +1043,15 @@ impl MultiBufferSnapshot {
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range: Range<T>,
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theme: Option<&'a SyntaxTheme>,
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) -> MultiBufferChunks<'a> {
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let mut result = MultiBufferChunks {
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range: 0..range.end.to_offset(self),
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cursor: self.excerpts.cursor::<usize>(),
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header_height: 0,
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let range = range.start.to_offset(self)..range.end.to_offset(self);
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let mut chunks = MultiBufferChunks {
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range: range.clone(),
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excerpts: self.excerpts.cursor(),
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excerpt_chunks: None,
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has_trailing_newline: false,
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theme,
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};
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result.seek(range.start.to_offset(self));
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result
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chunks.seek(range.start);
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chunks
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}
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pub fn offset_to_point(&self, offset: usize) -> Point {
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@ -1626,6 +1629,38 @@ impl Excerpt {
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}
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}
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fn chunks_in_range<'a>(
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&'a self,
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range: Range<usize>,
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theme: Option<&'a SyntaxTheme>,
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) -> ExcerptChunks<'a> {
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let content_start = self.range.start.to_offset(&self.buffer);
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let chunks_start = content_start + range.start.saturating_sub(self.header_height as usize);
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let mut chunks_end = content_start
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+ cmp::min(range.end, self.text_summary.bytes)
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.saturating_sub(self.header_height as usize);
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let header_height = cmp::min(
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(self.header_height as usize).saturating_sub(range.start),
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range.len(),
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);
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let mut footer_height = 0;
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if self.has_trailing_newline && range.end == self.text_summary.bytes {
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chunks_end -= 1;
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if !range.is_empty() {
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footer_height = 1;
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}
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}
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let content_chunks = self.buffer.chunks(chunks_start..chunks_end, theme);
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ExcerptChunks {
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header_height,
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content_chunks,
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footer_height,
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}
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}
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fn bytes_in_range(&self, range: Range<usize>) -> ExcerptBytes {
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let content_start = self.range.start.to_offset(&self.buffer);
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let bytes_start = content_start + range.start.saturating_sub(self.header_height as usize);
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@ -1738,38 +1773,18 @@ impl<'a> MultiBufferChunks<'a> {
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pub fn seek(&mut self, offset: usize) {
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self.range.start = offset;
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self.cursor.seek_forward(&offset, Bias::Right, &());
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self.header_height = 0;
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self.excerpt_chunks = None;
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if let Some(excerpt) = self.cursor.item() {
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let buffer_range = excerpt.range.to_offset(&excerpt.buffer);
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self.header_height = excerpt.header_height;
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self.has_trailing_newline = excerpt.has_trailing_newline;
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let buffer_start;
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let start_overshoot = self.range.start - self.cursor.start();
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if start_overshoot < excerpt.header_height as usize {
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self.header_height -= start_overshoot as u8;
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buffer_start = buffer_range.start;
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} else {
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buffer_start =
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buffer_range.start + start_overshoot - excerpt.header_height as usize;
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self.header_height = 0;
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}
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let buffer_end;
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let end_overshoot = self.range.end - self.cursor.start();
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if end_overshoot < excerpt.header_height as usize {
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self.header_height -= excerpt.header_height - end_overshoot as u8;
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buffer_end = buffer_start;
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} else {
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buffer_end = cmp::min(
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buffer_range.end,
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buffer_range.start + end_overshoot - excerpt.header_height as usize,
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);
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}
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self.excerpt_chunks = Some(excerpt.buffer.chunks(buffer_start..buffer_end, self.theme));
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self.excerpts.seek(&offset, Bias::Right, &());
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if let Some(excerpt) = self.excerpts.item() {
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self.excerpt_chunks = Some(excerpt.chunks_in_range(
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self.range.start - self.excerpts.start()
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..cmp::min(
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self.range.end - self.excerpts.start(),
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excerpt.text_summary.bytes,
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),
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self.theme,
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));
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} else {
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self.excerpt_chunks = None;
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}
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}
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}
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@ -1778,56 +1793,22 @@ impl<'a> Iterator for MultiBufferChunks<'a> {
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type Item = Chunk<'a>;
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fn next(&mut self) -> Option<Self::Item> {
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loop {
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if self.header_height > 0 {
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let chunk = Chunk {
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text: unsafe {
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str::from_utf8_unchecked(&NEWLINES[..self.header_height as usize])
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},
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..Default::default()
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};
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self.range.start += self.header_height as usize;
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self.header_height = 0;
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return Some(chunk);
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}
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if let Some(excerpt_chunks) = self.excerpt_chunks.as_mut() {
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if let Some(chunk) = excerpt_chunks.next() {
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self.range.start += chunk.text.len();
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return Some(chunk);
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}
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self.excerpt_chunks.take();
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if self.has_trailing_newline && self.cursor.end(&()) <= self.range.end {
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self.range.start += 1;
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return Some(Chunk {
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text: "\n",
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..Default::default()
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});
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}
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}
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self.cursor.next(&());
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if *self.cursor.start() >= self.range.end {
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return None;
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}
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let excerpt = self.cursor.item()?;
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let buffer_range = excerpt.range.to_offset(&excerpt.buffer);
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let buffer_end = cmp::min(
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buffer_range.end,
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buffer_range.start + self.range.end
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- excerpt.header_height as usize
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- self.cursor.start(),
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);
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self.header_height = excerpt.header_height;
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self.has_trailing_newline = excerpt.has_trailing_newline;
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self.excerpt_chunks = Some(
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excerpt
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.buffer
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.chunks(buffer_range.start..buffer_end, self.theme),
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);
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if self.range.is_empty() {
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None
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} else if let Some(chunk) = self.excerpt_chunks.as_mut()?.next() {
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self.range.start += chunk.text.len();
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Some(chunk)
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} else {
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self.excerpts.next(&());
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let excerpt = self.excerpts.item()?;
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self.excerpt_chunks = Some(excerpt.chunks_in_range(
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0..cmp::min(
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self.range.end - self.excerpts.start(),
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excerpt.text_summary.bytes,
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),
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self.theme,
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));
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self.next()
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}
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}
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}
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@ -1908,6 +1889,38 @@ impl<'a> Iterator for ExcerptBytes<'a> {
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}
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}
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impl<'a> Iterator for ExcerptChunks<'a> {
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type Item = Chunk<'a>;
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fn next(&mut self) -> Option<Self::Item> {
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if self.header_height > 0 {
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let text = unsafe { str::from_utf8_unchecked(&NEWLINES[..self.header_height]) };
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self.header_height = 0;
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return Some(Chunk {
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text,
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..Default::default()
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});
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}
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if let Some(chunk) = self.content_chunks.next() {
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if !chunk.text.is_empty() {
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return Some(chunk);
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}
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}
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if self.footer_height > 0 {
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let text = unsafe { str::from_utf8_unchecked(&NEWLINES[..self.footer_height]) };
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self.footer_height = 0;
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return Some(Chunk {
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text,
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..Default::default()
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});
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}
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None
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}
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}
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impl ToOffset for Point {
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fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
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snapshot.point_to_offset(*self)
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@ -1943,7 +1956,7 @@ impl ToPoint for Point {
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mod tests {
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use super::*;
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use gpui::{elements::Empty, Element, MutableAppContext};
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use language::Buffer;
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use language::{Buffer, Rope};
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use rand::prelude::*;
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use std::env;
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use text::{Point, RandomCharIter};
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@ -2386,9 +2399,10 @@ mod tests {
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);
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}
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let text_rope = Rope::from(expected_text.as_str());
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for _ in 0..10 {
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let end_ix = snapshot.clip_offset(rng.gen_range(0..=snapshot.len()), Bias::Right);
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let start_ix = snapshot.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
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let end_ix = text_rope.clip_offset(rng.gen_range(0..=text_rope.len()), Bias::Right);
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let start_ix = text_rope.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
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assert_eq!(
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snapshot
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@ -2409,7 +2423,7 @@ mod tests {
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}
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for _ in 0..10 {
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let end_ix = snapshot.clip_offset(rng.gen_range(0..=snapshot.len()), Bias::Right);
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let end_ix = text_rope.clip_offset(rng.gen_range(0..=text_rope.len()), Bias::Right);
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assert_eq!(
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snapshot.reversed_chars_at(end_ix).collect::<String>(),
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expected_text[..end_ix].chars().rev().collect::<String>(),
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@ -2417,7 +2431,7 @@ mod tests {
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}
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for _ in 0..10 {
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let end_ix = rng.gen_range(0..=snapshot.len());
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let end_ix = rng.gen_range(0..=text_rope.len());
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let start_ix = rng.gen_range(0..=end_ix);
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assert_eq!(
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snapshot
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