Add API to create a Transaction from potentially overlapping changes
This commit adds new functions to `Transaction` that allow creating edits that might potentially overlap. Any change that overlaps previous changes is ignored. Furthermore, a utility method is added that also drops selections associated with dropped changes (for transactions that are created from a selection). This is needed to avoid crashes when applying multicursor autocompletions, as the edit from a previous cursor may overlap with the next cursor/edit.
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@ -1,3 +1,5 @@
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use smallvec::SmallVec;
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use crate::{Range, Rope, Selection, Tendril};
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use std::borrow::Cow;
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@ -466,6 +468,33 @@ impl Transaction {
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self
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}
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/// Generate a transaction from a set of potentially overlapping changes. The `change_ranges`
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/// iterator yield the range (of removed text) in the old document for each edit. If any change
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/// overlaps with a range overlaps with a previous range then that range is ignored.
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///
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/// The `process_change` callback is called for each edit that is not ignored (in the order
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/// yielded by `changes`) and should return the new text that the associated range will be
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/// replaced with.
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///
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/// To make this function more flexible the iterator can yield additional data for each change
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/// that is passed to `process_change`
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pub fn change_ignore_overlapping<T>(
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doc: &Rope,
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change_ranges: impl Iterator<Item = (usize, usize, T)>,
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mut process_change: impl FnMut(usize, usize, T) -> Option<Tendril>,
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) -> Self {
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let mut last = 0;
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let changes = change_ranges.filter_map(|(from, to, data)| {
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if from < last {
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return None;
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}
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let tendril = process_change(from, to, data);
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last = to;
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Some((from, to, tendril))
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});
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Self::change(doc, changes)
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}
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/// Generate a transaction from a set of changes.
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pub fn change<I>(doc: &Rope, changes: I) -> Self
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where
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@ -513,6 +542,44 @@ impl Transaction {
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Self::change(doc, selection.iter().map(f))
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}
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pub fn change_by_selection_ignore_overlapping(
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doc: &Rope,
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selection: &Selection,
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mut change_range: impl FnMut(&Range) -> (usize, usize),
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mut create_tendril: impl FnMut(usize, usize) -> Option<Tendril>,
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) -> (Transaction, Selection) {
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let mut last_selection_idx = None;
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let mut new_primary_idx = None;
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let mut ranges: SmallVec<[Range; 1]> = SmallVec::new();
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let process_change = |change_start, change_end, (idx, range): (usize, &Range)| {
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// update the primary idx
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if idx == selection.primary_index() {
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new_primary_idx = Some(idx);
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} else if new_primary_idx.is_none() {
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if idx > selection.primary_index() {
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new_primary_idx = last_selection_idx;
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} else {
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last_selection_idx = Some(idx);
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}
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}
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ranges.push(*range);
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create_tendril(change_start, change_end)
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};
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let transaction = Self::change_ignore_overlapping(
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doc,
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selection.iter().enumerate().map(|range| {
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let (change_start, change_end) = change_range(range.1);
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(change_start, change_end, range)
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}),
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process_change,
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);
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(
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transaction,
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Selection::new(ranges, new_primary_idx.unwrap_or(0)),
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)
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}
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/// Insert text at each selection head.
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pub fn insert(doc: &Rope, selection: &Selection, text: Tendril) -> Self {
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Self::change_by_selection(doc, selection, |range| {
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