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|
//! Representation of a `TextEdit`.
//!
//! `rust-analyzer` never mutates text itself and only sends diffs to clients,
//! so `TextEdit` is the ultimate representation of the work done by
//! rust-analyzer.
use std::{slice, vec};
pub use text_size::{TextRange, TextSize};
/// `InsertDelete` -- a single "atomic" change to text
///
/// Must not overlap with other `InDel`s
#[derive(Debug, Clone)]
pub struct Indel {
pub insert: String,
/// Refers to offsets in the original text
pub delete: TextRange,
}
#[derive(Default, Debug, Clone)]
pub struct TextEdit {
indels: Vec<Indel>,
}
#[derive(Debug, Default, Clone)]
pub struct TextEditBuilder {
indels: Vec<Indel>,
}
impl Indel {
pub fn insert(offset: TextSize, text: String) -> Indel {
Indel::replace(TextRange::empty(offset), text)
}
pub fn delete(range: TextRange) -> Indel {
Indel::replace(range, String::new())
}
pub fn replace(range: TextRange, replace_with: String) -> Indel {
Indel { delete: range, insert: replace_with }
}
pub fn apply(&self, text: &mut String) {
let start: usize = self.delete.start().into();
let end: usize = self.delete.end().into();
text.replace_range(start..end, &self.insert);
}
}
impl TextEdit {
pub fn insert(offset: TextSize, text: String) -> TextEdit {
let mut builder = TextEditBuilder::default();
builder.insert(offset, text);
builder.finish()
}
pub fn delete(range: TextRange) -> TextEdit {
let mut builder = TextEditBuilder::default();
builder.delete(range);
builder.finish()
}
pub fn replace(range: TextRange, replace_with: String) -> TextEdit {
let mut builder = TextEditBuilder::default();
builder.replace(range, replace_with);
builder.finish()
}
pub fn len(&self) -> usize {
self.indels.len()
}
pub fn is_empty(&self) -> bool {
self.indels.is_empty()
}
pub fn iter(&self) -> slice::Iter<'_, Indel> {
self.indels.iter()
}
pub fn into_iter(self) -> vec::IntoIter<Indel> {
self.indels.into_iter()
}
pub fn apply(&self, text: &mut String) {
match self.len() {
0 => return,
1 => {
self.indels[0].apply(text);
return;
}
_ => (),
}
let mut total_len = TextSize::of(&*text);
for indel in self.indels.iter() {
total_len += TextSize::of(&indel.insert);
total_len -= indel.delete.end() - indel.delete.start();
}
let mut buf = String::with_capacity(total_len.into());
let mut prev = 0;
for indel in self.indels.iter() {
let start: usize = indel.delete.start().into();
let end: usize = indel.delete.end().into();
if start > prev {
buf.push_str(&text[prev..start]);
}
buf.push_str(&indel.insert);
prev = end;
}
buf.push_str(&text[prev..text.len()]);
assert_eq!(TextSize::of(&buf), total_len);
// FIXME: figure out a way to mutate the text in-place or reuse the
// memory in some other way
*text = buf
}
pub fn union(&mut self, other: TextEdit) -> Result<(), TextEdit> {
// FIXME: can be done without allocating intermediate vector
let mut all = self.iter().chain(other.iter()).collect::<Vec<_>>();
if !check_disjoint(&mut all) {
return Err(other);
}
self.indels.extend(other.indels);
assert!(check_disjoint(&mut self.indels));
Ok(())
}
pub fn apply_to_offset(&self, offset: TextSize) -> Option<TextSize> {
let mut res = offset;
for indel in self.indels.iter() {
if indel.delete.start() >= offset {
break;
}
if offset < indel.delete.end() {
return None;
}
res += TextSize::of(&indel.insert);
res -= indel.delete.len();
}
Some(res)
}
}
impl TextEditBuilder {
pub fn replace(&mut self, range: TextRange, replace_with: String) {
self.indels.push(Indel::replace(range, replace_with))
}
pub fn delete(&mut self, range: TextRange) {
self.indels.push(Indel::delete(range))
}
pub fn insert(&mut self, offset: TextSize, text: String) {
self.indels.push(Indel::insert(offset, text))
}
pub fn finish(self) -> TextEdit {
let mut indels = self.indels;
assert!(check_disjoint(&mut indels));
TextEdit { indels }
}
pub fn invalidates_offset(&self, offset: TextSize) -> bool {
self.indels.iter().any(|indel| indel.delete.contains_inclusive(offset))
}
}
fn check_disjoint(indels: &mut [impl std::borrow::Borrow<Indel>]) -> bool {
indels.sort_by_key(|indel| (indel.borrow().delete.start(), indel.borrow().delete.end()));
indels
.iter()
.zip(indels.iter().skip(1))
.all(|(l, r)| l.borrow().delete.end() <= r.borrow().delete.start())
}
|
