use collections::BTreeMap;use gpui::HighlightStyle;use language::Chunk;use multi_buffer::{MultiBufferChunks, MultiBufferSnapshot, ToOffset as _};use std::{    cmp,    iter::{self, Peekable},    ops::Range,    vec,}; use crate::display_map::{HighlightKey, TextHighlights}; pub struct CustomHighlightsChunks<'a> {    buffer_chunks: MultiBufferChunks<'a>,    buffer_chunk: Option<Chunk<'a>>,    offset: usize,    multibuffer_snapshot: &'a MultiBufferSnapshot,     highlight_endpoints: Peekable<vec::IntoIter<HighlightEndpoint>>,    active_highlights: BTreeMap<HighlightKey, HighlightStyle>,    text_highlights: Option<&'a TextHighlights>,} #[derive(Debug, Copy, Clone, Eq, PartialEq)]struct HighlightEndpoint {    offset: usize,    is_start: bool,    tag: HighlightKey,    style: HighlightStyle,} impl<'a> CustomHighlightsChunks<'a> {    pub fn new(        range: Range<usize>,        language_aware: bool,        text_highlights: Option<&'a TextHighlights>,        multibuffer_snapshot: &'a MultiBufferSnapshot,    ) -> Self {        Self {            buffer_chunks: multibuffer_snapshot.chunks(range.clone(), language_aware),            buffer_chunk: None,            offset: range.start,             text_highlights,            highlight_endpoints: create_highlight_endpoints(                &range,                text_highlights,                multibuffer_snapshot,            ),            active_highlights: Default::default(),            multibuffer_snapshot,        }    }     pub fn seek(&mut self, new_range: Range<usize>) {        self.highlight_endpoints =            create_highlight_endpoints(&new_range, self.text_highlights, self.multibuffer_snapshot);        self.offset = new_range.start;        self.buffer_chunks.seek(new_range);        self.buffer_chunk.take();        self.active_highlights.clear()    }} fn create_highlight_endpoints(    range: &Range<usize>,    text_highlights: Option<&TextHighlights>,    buffer: &MultiBufferSnapshot,) -> iter::Peekable<vec::IntoIter<HighlightEndpoint>> {    let mut highlight_endpoints = Vec::new();    if let Some(text_highlights) = text_highlights {        let start = buffer.anchor_after(range.start);        let end = buffer.anchor_after(range.end);        for (&tag, text_highlights) in text_highlights.iter() {            let style = text_highlights.0;            let ranges = &text_highlights.1;             let start_ix = match ranges.binary_search_by(|probe| {                let cmp = probe.end.cmp(&start, &buffer);                if cmp.is_gt() {                    cmp::Ordering::Greater                } else {                    cmp::Ordering::Less                }            }) {                Ok(i) | Err(i) => i,            };             for range in &ranges[start_ix..] {                if range.start.cmp(&end, &buffer).is_ge() {                    break;                }                 highlight_endpoints.push(HighlightEndpoint {                    offset: range.start.to_offset(&buffer),                    is_start: true,                    tag,                    style,                });                highlight_endpoints.push(HighlightEndpoint {                    offset: range.end.to_offset(&buffer),                    is_start: false,                    tag,                    style,                });            }        }        highlight_endpoints.sort();    }    highlight_endpoints.into_iter().peekable()} impl<'a> Iterator for CustomHighlightsChunks<'a> {    type Item = Chunk<'a>;     fn next(&mut self) -> Option<Self::Item> {        let mut next_highlight_endpoint = usize::MAX;        while let Some(endpoint) = self.highlight_endpoints.peek().copied() {            if endpoint.offset <= self.offset {                if endpoint.is_start {                    self.active_highlights.insert(endpoint.tag, endpoint.style);                } else {                    self.active_highlights.remove(&endpoint.tag);                }                self.highlight_endpoints.next();            } else {                next_highlight_endpoint = endpoint.offset;                break;            }        }         let chunk = self            .buffer_chunk            .get_or_insert_with(|| self.buffer_chunks.next().unwrap());        if chunk.text.is_empty() {            *chunk = self.buffer_chunks.next().unwrap();        }         let (prefix, suffix) = chunk            .text            .split_at(chunk.text.len().min(next_highlight_endpoint - self.offset));         chunk.text = suffix;        self.offset += prefix.len();        let mut prefix = Chunk {            text: prefix,            ..chunk.clone()        };        if !self.active_highlights.is_empty() {            let mut highlight_style = HighlightStyle::default();            for active_highlight in self.active_highlights.values() {                highlight_style.highlight(*active_highlight);            }            prefix.highlight_style = Some(highlight_style);        }        Some(prefix)    }} impl PartialOrd for HighlightEndpoint {    fn partial_cmp(&self, other: &Self) -> Option<cmp::Ordering> {        Some(self.cmp(other))    }} impl Ord for HighlightEndpoint {    fn cmp(&self, other: &Self) -> cmp::Ordering {        self.offset            .cmp(&other.offset)            .then_with(|| other.is_start.cmp(&self.is_start))    }}