699 lines
23 KiB
Rust
699 lines
23 KiB
Rust
use super::{
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buffer, Anchor, AnchorRangeExt, Buffer, DisplayPoint, Edit, Point, TextSummary, ToOffset,
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};
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use crate::{
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sum_tree::{self, Cursor, SumTree},
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util::find_insertion_index,
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};
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use anyhow::{anyhow, Result};
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use gpui::{AppContext, ModelHandle};
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use std::{
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cmp::{self, Ordering},
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iter::Take,
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ops::Range,
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};
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use sum_tree::{Dimension, SeekBias};
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pub struct FoldMap {
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buffer: ModelHandle<Buffer>,
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transforms: SumTree<Transform>,
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folds: Vec<Range<Anchor>>,
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}
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impl FoldMap {
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pub fn new(buffer: ModelHandle<Buffer>, app: &AppContext) -> Self {
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let text_summary = buffer.as_ref(app).text_summary();
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Self {
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buffer,
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folds: Vec::new(),
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transforms: SumTree::from_item(Transform {
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summary: TransformSummary {
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buffer: text_summary.clone(),
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display: text_summary,
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},
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display_text: None,
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}),
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}
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}
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pub fn buffer_rows(&self, start_row: u32) -> Result<BufferRows> {
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if start_row > self.transforms.summary().display.lines.row {
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return Err(anyhow!("invalid display row {}", start_row));
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}
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let display_point = Point::new(start_row, 0);
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let mut cursor = self.transforms.cursor();
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cursor.seek(&DisplayPoint(display_point), SeekBias::Left);
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Ok(BufferRows {
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display_point,
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cursor,
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})
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}
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pub fn len(&self) -> usize {
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self.transforms.summary().display.chars
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}
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pub fn line_len(&self, row: u32, ctx: &AppContext) -> Result<u32> {
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let line_start = self.to_display_offset(DisplayPoint::new(row, 0), ctx)?.0;
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let line_end = if row >= self.max_point().row() {
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self.len()
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} else {
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self.to_display_offset(DisplayPoint::new(row + 1, 0), ctx)?
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.0
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- 1
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};
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Ok((line_end - line_start) as u32)
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}
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pub fn chars_at<'a>(&'a self, point: DisplayPoint, app: &'a AppContext) -> Result<Chars<'a>> {
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let offset = self.to_display_offset(point, app)?;
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let mut cursor = self.transforms.cursor();
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cursor.seek(&offset, SeekBias::Right);
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let buffer = self.buffer.as_ref(app);
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Ok(Chars {
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cursor,
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offset: offset.0,
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buffer,
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buffer_chars: None,
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})
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}
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pub fn max_point(&self) -> DisplayPoint {
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DisplayPoint(self.transforms.summary().display.lines)
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}
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pub fn rightmost_point(&self) -> DisplayPoint {
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DisplayPoint(self.transforms.summary().display.rightmost_point)
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}
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pub fn fold<T: ToOffset>(
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&mut self,
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ranges: impl IntoIterator<Item = Range<T>>,
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app: &AppContext,
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) -> Result<()> {
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let mut edits = Vec::new();
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let buffer = self.buffer.as_ref(app);
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for range in ranges.into_iter() {
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let start = range.start.to_offset(buffer)?;
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let end = range.end.to_offset(buffer)?;
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edits.push(Edit {
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old_range: start..end,
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new_range: start..end,
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});
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let fold = buffer.anchor_after(start)?..buffer.anchor_before(end)?;
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let ix = find_insertion_index(&self.folds, |probe| probe.cmp(&fold, buffer))?;
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self.folds.insert(ix, fold);
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}
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edits.sort_unstable_by(|a, b| {
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a.old_range
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.start
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.cmp(&b.old_range.start)
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.then_with(|| b.old_range.end.cmp(&a.old_range.end))
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});
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self.apply_edits(&edits, app)?;
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Ok(())
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}
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pub fn unfold<T: ToOffset>(
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&mut self,
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ranges: impl IntoIterator<Item = Range<T>>,
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app: &AppContext,
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) -> Result<()> {
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let buffer = self.buffer.as_ref(app);
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let mut edits = Vec::new();
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for range in ranges.into_iter() {
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let start = buffer.anchor_before(range.start.to_offset(buffer)?)?;
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let end = buffer.anchor_after(range.end.to_offset(buffer)?)?;
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// Remove intersecting folds and add their ranges to edits that are passed to apply_edits
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self.folds.retain(|fold| {
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if fold.start.cmp(&end, buffer).unwrap() > Ordering::Equal
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|| fold.end.cmp(&start, buffer).unwrap() < Ordering::Equal
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{
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true
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} else {
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let offset_range =
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fold.start.to_offset(buffer).unwrap()..fold.end.to_offset(buffer).unwrap();
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edits.push(Edit {
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old_range: offset_range.clone(),
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new_range: offset_range,
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});
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false
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}
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});
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}
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self.apply_edits(&edits, app)?;
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Ok(())
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}
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pub fn is_line_folded(&self, display_row: u32) -> bool {
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let mut cursor = self.transforms.cursor::<DisplayPoint, DisplayPoint>();
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cursor.seek(&DisplayPoint::new(display_row, 0), SeekBias::Right);
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while let Some(transform) = cursor.item() {
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if transform.display_text.is_some() {
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return true;
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}
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if cursor.end().row() == display_row {
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cursor.next()
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} else {
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break;
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}
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}
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false
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}
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pub fn to_display_offset(
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&self,
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point: DisplayPoint,
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app: &AppContext,
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) -> Result<DisplayOffset> {
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let mut cursor = self.transforms.cursor::<DisplayPoint, TransformSummary>();
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cursor.seek(&point, SeekBias::Right);
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let overshoot = point.0 - cursor.start().display.lines;
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let mut offset = cursor.start().display.chars;
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if !overshoot.is_zero() {
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let transform = cursor
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.item()
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.ok_or_else(|| anyhow!("display point {:?} is out of range", point))?;
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assert!(transform.display_text.is_none());
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let end_buffer_offset =
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(cursor.start().buffer.lines + overshoot).to_offset(self.buffer.as_ref(app))?;
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offset += end_buffer_offset - cursor.start().buffer.chars;
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}
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Ok(DisplayOffset(offset))
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}
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pub fn to_buffer_point(&self, display_point: DisplayPoint) -> Point {
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let mut cursor = self.transforms.cursor::<DisplayPoint, TransformSummary>();
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cursor.seek(&display_point, SeekBias::Right);
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let overshoot = display_point.0 - cursor.start().display.lines;
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cursor.start().buffer.lines + overshoot
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}
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pub fn to_display_point(&self, point: Point) -> DisplayPoint {
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let mut cursor = self.transforms.cursor::<Point, TransformSummary>();
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cursor.seek(&point, SeekBias::Right);
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let overshoot = point - cursor.start().buffer.lines;
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DisplayPoint(cmp::min(
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cursor.start().display.lines + overshoot,
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cursor.end().display.lines,
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))
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}
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pub fn apply_edits(&mut self, edits: &[Edit], app: &AppContext) -> Result<()> {
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let buffer = self.buffer.as_ref(app);
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let mut edits = edits.iter().cloned().peekable();
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let mut new_transforms = SumTree::new();
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let mut cursor = self.transforms.cursor::<usize, usize>();
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cursor.seek(&0, SeekBias::Right);
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while let Some(mut edit) = edits.next() {
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new_transforms.push_tree(cursor.slice(&edit.old_range.start, SeekBias::Left));
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edit.new_range.start -= edit.old_range.start - cursor.start();
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edit.old_range.start = *cursor.start();
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cursor.seek(&edit.old_range.end, SeekBias::Right);
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cursor.next();
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let mut delta = edit.delta();
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loop {
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edit.old_range.end = *cursor.start();
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if let Some(next_edit) = edits.peek() {
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if next_edit.old_range.start > edit.old_range.end {
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break;
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}
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let next_edit = edits.next().unwrap();
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delta += next_edit.delta();
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if next_edit.old_range.end > edit.old_range.end {
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edit.old_range.end = next_edit.old_range.end;
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cursor.seek(&edit.old_range.end, SeekBias::Right);
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cursor.next();
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}
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} else {
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break;
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}
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}
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edit.new_range.end =
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((edit.new_range.start + edit.old_extent()) as isize + delta) as usize;
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let anchor = buffer.anchor_before(edit.new_range.start)?;
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let folds_start =
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find_insertion_index(&self.folds, |probe| probe.start.cmp(&anchor, buffer))?;
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let mut folds = self.folds[folds_start..]
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.iter()
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.map(|fold| {
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fold.start.to_offset(buffer).unwrap()..fold.end.to_offset(buffer).unwrap()
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})
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.peekable();
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while folds
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.peek()
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.map_or(false, |fold| fold.start < edit.new_range.end)
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{
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let mut fold = folds.next().unwrap();
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let sum = new_transforms.summary();
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assert!(fold.start >= sum.buffer.chars);
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while folds
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.peek()
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.map_or(false, |next_fold| next_fold.start <= fold.end)
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{
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let next_fold = folds.next().unwrap();
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if next_fold.end > fold.end {
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fold.end = next_fold.end;
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}
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}
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if fold.start > sum.buffer.chars {
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let text_summary = buffer.text_summary_for_range(sum.buffer.chars..fold.start);
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new_transforms.push(Transform {
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summary: TransformSummary {
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display: text_summary.clone(),
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buffer: text_summary,
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},
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display_text: None,
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});
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}
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if fold.end > fold.start {
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new_transforms.push(Transform {
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summary: TransformSummary {
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display: TextSummary {
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chars: 1,
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bytes: '…'.len_utf8(),
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lines: Point::new(0, 1),
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first_line_len: 1,
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rightmost_point: Point::new(0, 1),
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},
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buffer: buffer.text_summary_for_range(fold.start..fold.end),
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},
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display_text: Some('…'),
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});
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}
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}
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let sum = new_transforms.summary();
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if sum.buffer.chars < edit.new_range.end {
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let text_summary =
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buffer.text_summary_for_range(sum.buffer.chars..edit.new_range.end);
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new_transforms.push(Transform {
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summary: TransformSummary {
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display: text_summary.clone(),
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buffer: text_summary,
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},
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display_text: None,
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});
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}
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}
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new_transforms.push_tree(cursor.suffix());
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drop(cursor);
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self.transforms = new_transforms;
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Ok(())
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}
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}
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#[derive(Clone, Debug, Default, Eq, PartialEq)]
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struct Transform {
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summary: TransformSummary,
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display_text: Option<char>,
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}
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#[derive(Clone, Debug, Default, Eq, PartialEq)]
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struct TransformSummary {
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display: TextSummary,
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buffer: TextSummary,
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}
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impl sum_tree::Item for Transform {
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type Summary = TransformSummary;
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fn summary(&self) -> Self::Summary {
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self.summary.clone()
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}
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}
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impl<'a> std::ops::AddAssign<&'a Self> for TransformSummary {
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fn add_assign(&mut self, other: &'a Self) {
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self.buffer += &other.buffer;
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self.display += &other.display;
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}
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}
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impl<'a> Dimension<'a, TransformSummary> for TransformSummary {
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fn add_summary(&mut self, summary: &'a TransformSummary) {
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*self += summary;
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}
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}
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pub struct BufferRows<'a> {
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cursor: Cursor<'a, Transform, DisplayPoint, TransformSummary>,
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display_point: Point,
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}
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impl<'a> Iterator for BufferRows<'a> {
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type Item = u32;
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fn next(&mut self) -> Option<Self::Item> {
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while self.display_point > self.cursor.end().display.lines {
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self.cursor.next();
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if self.cursor.item().is_none() {
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// TODO: Return a bool from next?
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break;
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}
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}
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if self.cursor.item().is_some() {
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let overshoot = self.display_point - self.cursor.start().display.lines;
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let buffer_point = self.cursor.start().buffer.lines + overshoot;
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self.display_point.row += 1;
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Some(buffer_point.row)
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} else {
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None
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}
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}
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}
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pub struct Chars<'a> {
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cursor: Cursor<'a, Transform, DisplayOffset, TransformSummary>,
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offset: usize,
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buffer: &'a Buffer,
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buffer_chars: Option<Take<buffer::Chars<'a>>>,
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}
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impl<'a> Iterator for Chars<'a> {
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type Item = char;
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fn next(&mut self) -> Option<Self::Item> {
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if let Some(c) = self.buffer_chars.as_mut().and_then(|chars| chars.next()) {
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self.offset += 1;
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return Some(c);
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}
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if self.offset == self.cursor.end().display.chars {
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self.cursor.next();
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}
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self.cursor.item().and_then(|transform| {
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if let Some(c) = transform.display_text {
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self.offset += 1;
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Some(c)
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} else {
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let overshoot = self.offset - self.cursor.start().display.chars;
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let buffer_start = self.cursor.start().buffer.chars + overshoot;
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let char_count = self.cursor.end().buffer.chars - buffer_start;
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self.buffer_chars =
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Some(self.buffer.chars_at(buffer_start).unwrap().take(char_count));
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self.next()
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}
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})
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}
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}
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impl<'a> Dimension<'a, TransformSummary> for DisplayPoint {
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fn add_summary(&mut self, summary: &'a TransformSummary) {
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self.0 += &summary.display.lines;
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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 DisplayOffset(usize);
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impl<'a> Dimension<'a, TransformSummary> for DisplayOffset {
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fn add_summary(&mut self, summary: &'a TransformSummary) {
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self.0 += &summary.display.chars;
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}
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}
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impl<'a> Dimension<'a, TransformSummary> for Point {
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fn add_summary(&mut self, summary: &'a TransformSummary) {
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*self += &summary.buffer.lines;
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}
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}
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impl<'a> Dimension<'a, TransformSummary> for usize {
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fn add_summary(&mut self, summary: &'a TransformSummary) {
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*self += &summary.buffer.chars;
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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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use crate::test::sample_text;
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use gpui::App;
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#[test]
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fn test_basic_folds() -> Result<()> {
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let mut app = App::new()?;
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let buffer = app.add_model(|_| Buffer::new(0, sample_text(5, 6)));
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let mut map = app.read(|app| FoldMap::new(buffer.clone(), app));
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app.read(|app| {
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map.fold(
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vec![
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Point::new(0, 2)..Point::new(2, 2),
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Point::new(2, 4)..Point::new(4, 1),
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],
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app,
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)?;
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assert_eq!(map.text(app), "aa…cc…eeeee");
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Ok::<(), anyhow::Error>(())
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})?;
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let edits = buffer.update(&mut app, |buffer, ctx| {
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let start_version = buffer.version.clone();
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buffer.edit(
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vec![
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Point::new(0, 0)..Point::new(0, 1),
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Point::new(2, 3)..Point::new(2, 3),
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],
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"123",
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Some(ctx),
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)?;
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Ok::<_, anyhow::Error>(buffer.edits_since(start_version).collect::<Vec<_>>())
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})?;
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app.read(|app| {
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map.apply_edits(&edits, app)?;
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assert_eq!(map.text(app), "123a…c123c…eeeee");
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Ok::<(), anyhow::Error>(())
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})?;
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let edits = buffer.update(&mut app, |buffer, ctx| {
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let start_version = buffer.version.clone();
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buffer.edit(Some(Point::new(2, 6)..Point::new(4, 3)), "456", Some(ctx))?;
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Ok::<_, anyhow::Error>(buffer.edits_since(start_version).collect::<Vec<_>>())
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})?;
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app.read(|app| {
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map.apply_edits(&edits, app)?;
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assert_eq!(map.text(app), "123a…c123456eee");
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map.unfold(Some(Point::new(0, 4)..Point::new(0, 4)), app)?;
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assert_eq!(map.text(app), "123aaaaa\nbbbbbb\nccc123456eee");
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Ok(())
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})
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}
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#[test]
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|
fn test_overlapping_folds() -> Result<()> {
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let mut app = App::new()?;
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let buffer = app.add_model(|_| Buffer::new(0, sample_text(5, 6)));
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|
app.read(|app| {
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let mut map = FoldMap::new(buffer.clone(), app);
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map.fold(
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vec![
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Point::new(0, 2)..Point::new(2, 2),
|
|
Point::new(0, 4)..Point::new(1, 0),
|
|
Point::new(1, 2)..Point::new(3, 2),
|
|
Point::new(3, 1)..Point::new(4, 1),
|
|
],
|
|
app,
|
|
)?;
|
|
assert_eq!(map.text(app), "aa…eeeee");
|
|
Ok(())
|
|
})
|
|
}
|
|
|
|
#[test]
|
|
fn test_merging_folds_via_edit() -> Result<()> {
|
|
let mut app = App::new()?;
|
|
let buffer = app.add_model(|_| Buffer::new(0, sample_text(5, 6)));
|
|
let mut map = app.read(|app| FoldMap::new(buffer.clone(), app));
|
|
|
|
app.read(|app| {
|
|
map.fold(
|
|
vec![
|
|
Point::new(0, 2)..Point::new(2, 2),
|
|
Point::new(3, 1)..Point::new(4, 1),
|
|
],
|
|
app,
|
|
)?;
|
|
assert_eq!(map.text(app), "aa…cccc\nd…eeeee");
|
|
Ok::<(), anyhow::Error>(())
|
|
})?;
|
|
|
|
let edits = buffer.update(&mut app, |buffer, ctx| {
|
|
let start_version = buffer.version.clone();
|
|
buffer.edit(Some(Point::new(2, 2)..Point::new(3, 1)), "", Some(ctx))?;
|
|
Ok::<_, anyhow::Error>(buffer.edits_since(start_version).collect::<Vec<_>>())
|
|
})?;
|
|
|
|
app.read(|app| {
|
|
map.apply_edits(&edits, app)?;
|
|
assert_eq!(map.text(app), "aa…eeeee");
|
|
Ok(())
|
|
})
|
|
}
|
|
|
|
#[test]
|
|
fn test_random_folds() -> Result<()> {
|
|
use crate::editor::ToPoint;
|
|
use crate::util::RandomCharIter;
|
|
use rand::prelude::*;
|
|
|
|
for seed in 0..100 {
|
|
println!("{:?}", seed);
|
|
let mut rng = StdRng::seed_from_u64(seed);
|
|
|
|
let mut app = App::new()?;
|
|
let buffer = app.add_model(|_| {
|
|
let len = rng.gen_range(0..10);
|
|
let text = RandomCharIter::new(&mut rng).take(len).collect::<String>();
|
|
Buffer::new(0, text)
|
|
});
|
|
let mut map = app.read(|app| FoldMap::new(buffer.clone(), app));
|
|
|
|
app.read(|app| {
|
|
let buffer = buffer.as_ref(app);
|
|
|
|
let fold_count = rng.gen_range(0..10);
|
|
let mut fold_ranges: Vec<Range<usize>> = Vec::new();
|
|
for _ in 0..fold_count {
|
|
let end = rng.gen_range(0..buffer.len() + 1);
|
|
let start = rng.gen_range(0..end + 1);
|
|
fold_ranges.push(start..end);
|
|
}
|
|
|
|
map.fold(fold_ranges, app)?;
|
|
|
|
let mut expected_text = buffer.text();
|
|
for fold_range in map.merged_fold_ranges(app).into_iter().rev() {
|
|
expected_text.replace_range(fold_range.start..fold_range.end, "…");
|
|
}
|
|
|
|
assert_eq!(map.text(app), expected_text);
|
|
|
|
for fold_range in map.merged_fold_ranges(app) {
|
|
let display_point =
|
|
map.to_display_point(fold_range.start.to_point(buffer).unwrap());
|
|
assert!(map.is_line_folded(display_point.row()));
|
|
}
|
|
|
|
Ok::<(), anyhow::Error>(())
|
|
})?;
|
|
|
|
let edits = buffer.update(&mut app, |buffer, ctx| {
|
|
let start_version = buffer.version.clone();
|
|
let edit_count = rng.gen_range(1..10);
|
|
buffer.randomly_edit(&mut rng, edit_count, Some(ctx));
|
|
Ok::<_, anyhow::Error>(buffer.edits_since(start_version).collect::<Vec<_>>())
|
|
})?;
|
|
|
|
app.read(|app| {
|
|
map.apply_edits(&edits, app)?;
|
|
|
|
let buffer = map.buffer.as_ref(app);
|
|
let mut expected_text = buffer.text();
|
|
for fold_range in map.merged_fold_ranges(app).into_iter().rev() {
|
|
expected_text.replace_range(fold_range.start..fold_range.end, "…");
|
|
}
|
|
assert_eq!(map.text(app), expected_text);
|
|
|
|
Ok::<(), anyhow::Error>(())
|
|
})?;
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
#[test]
|
|
fn test_buffer_rows() -> Result<()> {
|
|
let mut app = App::new()?;
|
|
let text = sample_text(6, 6) + "\n";
|
|
let buffer = app.add_model(|_| Buffer::new(0, text));
|
|
|
|
app.read(|app| {
|
|
let mut map = FoldMap::new(buffer.clone(), app);
|
|
|
|
map.fold(
|
|
vec![
|
|
Point::new(0, 2)..Point::new(2, 2),
|
|
Point::new(3, 1)..Point::new(4, 1),
|
|
],
|
|
app,
|
|
)?;
|
|
|
|
assert_eq!(map.text(app), "aa…cccc\nd…eeeee\nffffff\n");
|
|
assert_eq!(map.buffer_rows(0)?.collect::<Vec<_>>(), vec![0, 3, 5, 6]);
|
|
assert_eq!(map.buffer_rows(3)?.collect::<Vec<_>>(), vec![6]);
|
|
|
|
Ok(())
|
|
})
|
|
}
|
|
|
|
impl FoldMap {
|
|
fn text(&self, app: &AppContext) -> String {
|
|
self.chars_at(DisplayPoint(Point::zero()), app)
|
|
.unwrap()
|
|
.collect()
|
|
}
|
|
|
|
fn merged_fold_ranges(&self, app: &AppContext) -> Vec<Range<usize>> {
|
|
let buffer = self.buffer.as_ref(app);
|
|
let mut fold_ranges = self
|
|
.folds
|
|
.iter()
|
|
.map(|fold| {
|
|
fold.start.to_offset(buffer).unwrap()..fold.end.to_offset(buffer).unwrap()
|
|
})
|
|
.peekable();
|
|
|
|
let mut merged_ranges = Vec::new();
|
|
while let Some(mut fold_range) = fold_ranges.next() {
|
|
while let Some(next_range) = fold_ranges.peek() {
|
|
if fold_range.end >= next_range.start {
|
|
if next_range.end > fold_range.end {
|
|
fold_range.end = next_range.end;
|
|
}
|
|
fold_ranges.next();
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
if fold_range.end > fold_range.start {
|
|
merged_ranges.push(fold_range);
|
|
}
|
|
}
|
|
merged_ranges
|
|
}
|
|
}
|
|
}
|