481 lines
15 KiB
Rust
481 lines
15 KiB
Rust
use super::fold_map::{self, FoldEdit, FoldPoint, Snapshot as FoldSnapshot};
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use language::{rope, HighlightedChunk};
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use parking_lot::Mutex;
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use std::{mem, ops::Range};
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use sum_tree::Bias;
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pub struct TabMap(Mutex<Snapshot>);
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impl TabMap {
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pub fn new(input: FoldSnapshot, tab_size: usize) -> (Self, Snapshot) {
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let snapshot = Snapshot {
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fold_snapshot: input,
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tab_size,
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};
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(Self(Mutex::new(snapshot.clone())), snapshot)
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}
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pub fn sync(
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&self,
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fold_snapshot: FoldSnapshot,
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mut fold_edits: Vec<FoldEdit>,
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) -> (Snapshot, Vec<Edit>) {
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let mut old_snapshot = self.0.lock();
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let new_snapshot = Snapshot {
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fold_snapshot,
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tab_size: old_snapshot.tab_size,
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};
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let mut tab_edits = Vec::with_capacity(fold_edits.len());
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for fold_edit in &mut fold_edits {
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let mut delta = 0;
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for chunk in old_snapshot
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.fold_snapshot
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.chunks_at(fold_edit.old_bytes.end)
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{
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let patterns: &[_] = &['\t', '\n'];
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if let Some(ix) = chunk.find(patterns) {
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if &chunk[ix..ix + 1] == "\t" {
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fold_edit.old_bytes.end.0 += delta + ix + 1;
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fold_edit.new_bytes.end.0 += delta + ix + 1;
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}
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break;
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}
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delta += chunk.len();
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}
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}
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let mut ix = 1;
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while ix < fold_edits.len() {
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let (prev_edits, next_edits) = fold_edits.split_at_mut(ix);
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let prev_edit = prev_edits.last_mut().unwrap();
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let edit = &next_edits[0];
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if prev_edit.old_bytes.end >= edit.old_bytes.start {
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prev_edit.old_bytes.end = edit.old_bytes.end;
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prev_edit.new_bytes.end = edit.new_bytes.end;
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fold_edits.remove(ix);
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} else {
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ix += 1;
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}
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}
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for fold_edit in fold_edits {
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let old_start = fold_edit
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.old_bytes
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.start
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.to_point(&old_snapshot.fold_snapshot);
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let old_end = fold_edit
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.old_bytes
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.end
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.to_point(&old_snapshot.fold_snapshot);
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let new_start = fold_edit
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.new_bytes
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.start
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.to_point(&new_snapshot.fold_snapshot);
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let new_end = fold_edit
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.new_bytes
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.end
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.to_point(&new_snapshot.fold_snapshot);
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tab_edits.push(Edit {
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old_lines: old_snapshot.to_tab_point(old_start)..old_snapshot.to_tab_point(old_end),
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new_lines: new_snapshot.to_tab_point(new_start)..new_snapshot.to_tab_point(new_end),
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});
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}
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*old_snapshot = new_snapshot;
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(old_snapshot.clone(), tab_edits)
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}
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}
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#[derive(Clone)]
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pub struct Snapshot {
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pub fold_snapshot: FoldSnapshot,
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pub tab_size: usize,
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}
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impl Snapshot {
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pub fn text_summary(&self) -> TextSummary {
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self.text_summary_for_range(TabPoint::zero()..self.max_point())
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}
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pub fn text_summary_for_range(&self, range: Range<TabPoint>) -> TextSummary {
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let input_start = self.to_fold_point(range.start, Bias::Left).0;
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let input_end = self.to_fold_point(range.end, Bias::Right).0;
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let input_summary = self
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.fold_snapshot
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.text_summary_for_range(input_start..input_end);
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let mut first_line_chars = 0;
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let mut first_line_bytes = 0;
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for c in self.chunks_at(range.start).flat_map(|chunk| chunk.chars()) {
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if c == '\n'
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|| (range.start.row() == range.end.row() && first_line_bytes == range.end.column())
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{
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break;
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}
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first_line_chars += 1;
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first_line_bytes += c.len_utf8() as u32;
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}
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let mut last_line_chars = 0;
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let mut last_line_bytes = 0;
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for c in self
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.chunks_at(TabPoint::new(range.end.row(), 0).max(range.start))
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.flat_map(|chunk| chunk.chars())
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{
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if last_line_bytes == range.end.column() {
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break;
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}
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last_line_chars += 1;
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last_line_bytes += c.len_utf8() as u32;
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}
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TextSummary {
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lines: range.end.0 - range.start.0,
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first_line_chars,
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last_line_chars,
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longest_row: input_summary.longest_row,
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longest_row_chars: input_summary.longest_row_chars,
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}
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}
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pub fn version(&self) -> usize {
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self.fold_snapshot.version
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}
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pub fn chunks_at(&self, point: TabPoint) -> Chunks {
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let (point, expanded_char_column, to_next_stop) = self.to_fold_point(point, Bias::Left);
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let fold_chunks = self
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.fold_snapshot
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.chunks_at(point.to_offset(&self.fold_snapshot));
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Chunks {
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fold_chunks,
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column: expanded_char_column,
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tab_size: self.tab_size,
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chunk: &SPACES[0..to_next_stop],
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skip_leading_tab: to_next_stop > 0,
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}
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}
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pub fn highlighted_chunks(&mut self, range: Range<TabPoint>) -> HighlightedChunks {
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let (input_start, expanded_char_column, to_next_stop) =
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self.to_fold_point(range.start, Bias::Left);
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let input_start = input_start.to_offset(&self.fold_snapshot);
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let input_end = self
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.to_fold_point(range.end, Bias::Right)
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.0
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.to_offset(&self.fold_snapshot);
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HighlightedChunks {
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fold_chunks: self
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.fold_snapshot
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.highlighted_chunks(input_start..input_end),
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column: expanded_char_column,
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tab_size: self.tab_size,
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chunk: HighlightedChunk {
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text: &SPACES[0..to_next_stop],
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..Default::default()
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},
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skip_leading_tab: to_next_stop > 0,
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}
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}
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pub fn buffer_rows(&self, row: u32) -> fold_map::BufferRows {
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self.fold_snapshot.buffer_rows(row)
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}
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#[cfg(test)]
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pub fn text(&self) -> String {
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self.chunks_at(Default::default()).collect()
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}
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pub fn max_point(&self) -> TabPoint {
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self.to_tab_point(self.fold_snapshot.max_point())
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}
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pub fn clip_point(&self, point: TabPoint, bias: Bias) -> TabPoint {
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self.to_tab_point(
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self.fold_snapshot
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.clip_point(self.to_fold_point(point, bias).0, bias),
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)
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}
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pub fn to_tab_point(&self, input: FoldPoint) -> TabPoint {
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let chars = self.fold_snapshot.chars_at(FoldPoint::new(input.row(), 0));
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let expanded = Self::expand_tabs(chars, input.column() as usize, self.tab_size);
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TabPoint::new(input.row(), expanded as u32)
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}
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pub fn to_fold_point(&self, output: TabPoint, bias: Bias) -> (FoldPoint, usize, usize) {
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let chars = self.fold_snapshot.chars_at(FoldPoint::new(output.row(), 0));
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let expanded = output.column() as usize;
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let (collapsed, expanded_char_column, to_next_stop) =
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Self::collapse_tabs(chars, expanded, bias, self.tab_size);
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(
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FoldPoint::new(output.row(), collapsed as u32),
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expanded_char_column,
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to_next_stop,
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)
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}
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fn expand_tabs(chars: impl Iterator<Item = char>, column: usize, tab_size: usize) -> usize {
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let mut expanded_chars = 0;
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let mut expanded_bytes = 0;
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let mut collapsed_bytes = 0;
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for c in chars {
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if collapsed_bytes == column {
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break;
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}
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if c == '\t' {
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let tab_len = tab_size - expanded_chars % tab_size;
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expanded_bytes += tab_len;
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expanded_chars += tab_len;
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} else {
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expanded_bytes += c.len_utf8();
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expanded_chars += 1;
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}
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collapsed_bytes += c.len_utf8();
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}
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expanded_bytes
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}
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fn collapse_tabs(
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mut chars: impl Iterator<Item = char>,
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column: usize,
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bias: Bias,
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tab_size: usize,
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) -> (usize, usize, usize) {
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let mut expanded_bytes = 0;
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let mut expanded_chars = 0;
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let mut collapsed_bytes = 0;
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while let Some(c) = chars.next() {
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if expanded_bytes >= column {
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break;
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}
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if c == '\t' {
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let tab_len = tab_size - (expanded_chars % tab_size);
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expanded_chars += tab_len;
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expanded_bytes += tab_len;
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if expanded_bytes > column {
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expanded_chars -= expanded_bytes - column;
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return match bias {
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Bias::Left => (collapsed_bytes, expanded_chars, expanded_bytes - column),
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Bias::Right => (collapsed_bytes + 1, expanded_chars, 0),
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};
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}
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} else {
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expanded_chars += 1;
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expanded_bytes += c.len_utf8();
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}
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if expanded_bytes > column && matches!(bias, Bias::Left) {
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expanded_chars -= 1;
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break;
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}
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collapsed_bytes += c.len_utf8();
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}
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(collapsed_bytes, expanded_chars, 0)
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}
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}
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#[derive(Copy, Clone, Debug, Default, Eq, Ord, PartialOrd, PartialEq)]
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pub struct TabPoint(pub super::Point);
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impl TabPoint {
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pub fn new(row: u32, column: u32) -> Self {
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Self(super::Point::new(row, column))
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}
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pub fn zero() -> Self {
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Self::new(0, 0)
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}
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pub fn row(self) -> u32 {
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self.0.row
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}
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pub fn column(self) -> u32 {
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self.0.column
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}
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}
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impl From<super::Point> for TabPoint {
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fn from(point: super::Point) -> Self {
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Self(point)
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}
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}
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#[derive(Clone, Debug, PartialEq, Eq)]
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pub struct Edit {
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pub old_lines: Range<TabPoint>,
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pub new_lines: Range<TabPoint>,
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}
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#[derive(Clone, Debug, Default, Eq, PartialEq)]
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pub struct TextSummary {
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pub lines: super::Point,
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pub first_line_chars: u32,
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pub last_line_chars: u32,
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pub longest_row: u32,
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pub longest_row_chars: u32,
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}
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impl<'a> From<&'a str> for TextSummary {
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fn from(text: &'a str) -> Self {
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let sum = rope::TextSummary::from(text);
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TextSummary {
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lines: sum.lines,
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first_line_chars: sum.first_line_chars,
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last_line_chars: sum.last_line_chars,
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longest_row: sum.longest_row,
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longest_row_chars: sum.longest_row_chars,
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}
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}
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}
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impl<'a> std::ops::AddAssign<&'a Self> for TextSummary {
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fn add_assign(&mut self, other: &'a Self) {
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let joined_chars = self.last_line_chars + other.first_line_chars;
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if joined_chars > self.longest_row_chars {
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self.longest_row = self.lines.row;
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self.longest_row_chars = joined_chars;
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}
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if other.longest_row_chars > self.longest_row_chars {
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self.longest_row = self.lines.row + other.longest_row;
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self.longest_row_chars = other.longest_row_chars;
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}
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if self.lines.row == 0 {
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self.first_line_chars += other.first_line_chars;
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}
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if other.lines.row == 0 {
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self.last_line_chars += other.first_line_chars;
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} else {
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self.last_line_chars = other.last_line_chars;
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}
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self.lines += &other.lines;
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}
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}
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// Handles a tab width <= 16
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const SPACES: &'static str = " ";
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pub struct Chunks<'a> {
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fold_chunks: fold_map::Chunks<'a>,
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chunk: &'a str,
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column: usize,
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tab_size: usize,
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skip_leading_tab: bool,
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}
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impl<'a> Iterator for Chunks<'a> {
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type Item = &'a str;
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fn next(&mut self) -> Option<Self::Item> {
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if self.chunk.is_empty() {
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if let Some(chunk) = self.fold_chunks.next() {
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self.chunk = chunk;
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if self.skip_leading_tab {
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self.chunk = &self.chunk[1..];
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self.skip_leading_tab = false;
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}
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} else {
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return None;
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}
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}
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for (ix, c) in self.chunk.char_indices() {
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match c {
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'\t' => {
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if ix > 0 {
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let (prefix, suffix) = self.chunk.split_at(ix);
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self.chunk = suffix;
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return Some(prefix);
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} else {
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self.chunk = &self.chunk[1..];
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let len = self.tab_size - self.column % self.tab_size;
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self.column += len;
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return Some(&SPACES[0..len]);
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}
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}
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'\n' => self.column = 0,
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_ => self.column += 1,
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}
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}
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let result = Some(self.chunk);
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self.chunk = "";
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result
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}
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}
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pub struct HighlightedChunks<'a> {
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fold_chunks: fold_map::HighlightedChunks<'a>,
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chunk: HighlightedChunk<'a>,
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column: usize,
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tab_size: usize,
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skip_leading_tab: bool,
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}
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impl<'a> Iterator for HighlightedChunks<'a> {
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type Item = HighlightedChunk<'a>;
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fn next(&mut self) -> Option<Self::Item> {
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if self.chunk.text.is_empty() {
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if let Some(chunk) = self.fold_chunks.next() {
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self.chunk = chunk;
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if self.skip_leading_tab {
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self.chunk.text = &self.chunk.text[1..];
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self.skip_leading_tab = false;
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}
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} else {
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return None;
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}
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}
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for (ix, c) in self.chunk.text.char_indices() {
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match c {
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'\t' => {
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if ix > 0 {
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let (prefix, suffix) = self.chunk.text.split_at(ix);
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self.chunk.text = suffix;
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return Some(HighlightedChunk {
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text: prefix,
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..self.chunk
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});
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} else {
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self.chunk.text = &self.chunk.text[1..];
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let len = self.tab_size - self.column % self.tab_size;
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self.column += len;
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return Some(HighlightedChunk {
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text: &SPACES[0..len],
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..self.chunk
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});
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}
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}
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'\n' => self.column = 0,
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_ => self.column += 1,
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}
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}
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Some(mem::take(&mut self.chunk))
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_expand_tabs() {
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assert_eq!(Snapshot::expand_tabs("\t".chars(), 0, 4), 0);
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assert_eq!(Snapshot::expand_tabs("\t".chars(), 1, 4), 4);
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assert_eq!(Snapshot::expand_tabs("\ta".chars(), 2, 4), 5);
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}
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}
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