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|
use ra_text_edit::AtomTextEdit;
use ra_syntax::{TextUnit, TextRange};
use crate::{LineIndex, LineCol, line_index::Utf16Char};
use superslice::Ext;
#[derive(Debug, Clone)]
enum Step {
Newline(TextUnit),
Utf16Char(TextRange),
}
struct LineIndexStepIter<'a> {
line_index: &'a LineIndex,
newlines: std::slice::Iter<'a, TextUnit>,
next_newline_idx: usize,
utf16_chars: Option<std::slice::Iter<'a, Utf16Char>>,
}
impl<'a> LineIndexStepIter<'a> {
fn from(line_index: &LineIndex) -> LineIndexStepIter {
let mut x = LineIndexStepIter {
line_index,
newlines: line_index.newlines().iter(),
next_newline_idx: 0,
utf16_chars: None,
};
// skip first newline since it's not real
x.next();
x
}
}
impl<'a> Iterator for LineIndexStepIter<'a> {
type Item = Step;
fn next(&mut self) -> Option<Step> {
self.utf16_chars
.as_mut()
.and_then(|x| {
None
// TODO Enable
// let x = x.next()?;
// Some(Step::Utf16Char(TextRange::from_to(x.start, x.end)))
})
.or_else(|| {
self.utf16_chars = self
.line_index
.utf16_chars(self.next_newline_idx)
.map(|x| x.iter());
self.next_newline_idx += 1;
let x = self.newlines.next()?;
Some(Step::Newline(*x))
})
}
}
#[derive(Debug)]
struct OffsetNewlineIter<'a> {
text: &'a str,
offset: TextUnit,
}
impl<'a> Iterator for OffsetNewlineIter<'a> {
type Item = Step;
fn next(&mut self) -> Option<Step> {
let (next, next_offset) = self
.text
.char_indices()
.filter_map(|(i, c)| {
if c == '\n' {
let next_offset = self.offset + TextUnit::from_usize(i + 1);
let next = Step::Newline(next_offset);
Some((next, next_offset))
} else {
None
// TODO enable
// let char_len = TextUnit::of_char(c);
// if char_len.to_usize() > 1 {
// let start = self.offset + TextUnit::from_usize(i);
// let end = start + char_len;
// let next = Step::Utf16Char(TextRange::from_to(start, end));
// let next_offset = end;
// Some((next, next_offset))
// } else {
// None
// }
}
})
.next()?;
let next_idx = (next_offset - self.offset).to_usize();
self.text = &self.text[next_idx..];
self.offset = next_offset;
Some(next)
}
}
#[derive(Debug)]
enum NextNewlines<'a> {
Use,
ReplaceMany(OffsetNewlineIter<'a>),
AddMany(OffsetNewlineIter<'a>),
}
#[derive(Debug)]
struct TranslatedEdit<'a> {
delete: TextRange,
insert: &'a str,
diff: i64,
}
struct Edits<'a, 'b> {
edits: &'b [&'a AtomTextEdit],
current: Option<TranslatedEdit<'a>>,
acc_diff: i64,
}
impl<'a, 'b> Edits<'a, 'b> {
fn new(sorted_edits: &'b [&'a AtomTextEdit]) -> Edits<'a, 'b> {
let mut x = Edits {
edits: sorted_edits,
current: None,
acc_diff: 0,
};
x.advance_edit();
x
}
fn advance_edit(&mut self) {
self.acc_diff += self.current.as_ref().map_or(0, |x| x.diff);
match self.edits.split_first() {
Some((next, rest)) => {
let delete = self.translate_range(next.delete);
let diff = next.insert.len() as i64 - next.delete.len().to_usize() as i64;
self.current = Some(TranslatedEdit {
delete,
insert: &next.insert,
diff,
});
self.edits = rest;
}
None => {
self.current = None;
}
}
}
fn next_inserted_newlines(&mut self) -> Option<OffsetNewlineIter<'a>> {
let cur = self.current.as_ref()?;
let res = Some(OffsetNewlineIter {
offset: cur.delete.start(),
text: &cur.insert,
});
self.advance_edit();
res
}
fn next_step(&mut self, step: &Step) -> NextNewlines {
let step_pos = match step {
&Step::Newline(n) => n,
&Step::Utf16Char(r) => unimplemented!(),
};
let res = match &mut self.current {
Some(edit) => {
if step_pos <= edit.delete.start() {
NextNewlines::Use
} else if step_pos <= edit.delete.end() {
let iter = OffsetNewlineIter {
offset: edit.delete.start(),
text: &edit.insert,
};
// empty slice
edit.insert = &edit.insert[edit.insert.len()..];
NextNewlines::ReplaceMany(iter)
} else {
let iter = OffsetNewlineIter {
offset: edit.delete.start(),
text: &edit.insert,
};
// empty slice
edit.insert = &edit.insert[edit.insert.len()..];
self.advance_edit();
NextNewlines::AddMany(iter)
}
}
None => NextNewlines::Use,
};
res
}
fn translate_range(&self, range: TextRange) -> TextRange {
if self.acc_diff == 0 {
range
} else {
let start = self.translate(range.start());
let end = self.translate(range.end());
TextRange::from_to(start, end)
}
}
fn translate(&self, x: TextUnit) -> TextUnit {
if self.acc_diff == 0 {
x
} else {
TextUnit::from((x.to_usize() as i64 + self.acc_diff) as u32)
}
}
fn translate_step(&self, x: &Step) -> Step {
if self.acc_diff == 0 {
x.clone()
} else {
match x {
&Step::Newline(n) => Step::Newline(self.translate(n)),
&Step::Utf16Char(r) => Step::Utf16Char(self.translate_range(r)),
}
}
}
}
pub fn count_newlines(offset: TextUnit, line_index: &LineIndex, edits: &[AtomTextEdit]) -> u32 {
let mut sorted_edits: Vec<&AtomTextEdit> = Vec::with_capacity(edits.len());
for edit in edits {
let insert_index =
sorted_edits.upper_bound_by_key(&edit.delete.start(), |x| x.delete.start());
sorted_edits.insert(insert_index, &edit);
}
let mut state = Edits::new(&sorted_edits);
let mut lines: u32 = 0;
macro_rules! test_step {
($x:ident) => {
match &$x {
Step::Newline(n) => {
if offset < *n {
return lines;
} else {
lines += 1;
}
}
Step::Utf16Char(x) => unimplemented!(),
}
};
}
for orig_step in LineIndexStepIter::from(line_index) {
loop {
let translated_newline = state.translate_step(&orig_step);
match state.next_step(&translated_newline) {
NextNewlines::Use => {
test_step!(translated_newline);
break;
}
NextNewlines::ReplaceMany(ns) => {
for n in ns {
test_step!(n);
}
break;
}
NextNewlines::AddMany(ns) => {
for n in ns {
test_step!(n);
}
}
}
}
}
loop {
match state.next_inserted_newlines() {
None => break,
Some(ns) => {
for n in ns {
test_step!(n);
}
}
}
}
lines
}
// for bench
pub fn translate_after_edit(
pre_edit_text: &str,
offset: TextUnit,
edits: Vec<AtomTextEdit>,
) -> LineCol {
let text = edit_text(pre_edit_text, edits);
let line_index = LineIndex::new(&text);
line_index.line_col(offset)
}
fn edit_text(pre_edit_text: &str, mut edits: Vec<AtomTextEdit>) -> String {
// apply edits ordered from last to first
// since they should not overlap we can just use start()
edits.sort_by_key(|x| -(x.delete.start().to_usize() as isize));
let mut text = pre_edit_text.to_owned();
for edit in &edits {
let range = edit.delete.start().to_usize()..edit.delete.end().to_usize();
text.replace_range(range, &edit.insert);
}
text
}
#[cfg(test)]
mod test {
use proptest::{prelude::*, proptest, proptest_helper};
use super::*;
use ra_text_edit::test_utils::{arb_text, arb_offset, arb_edits};
#[derive(Debug)]
struct ArbTextWithOffsetAndEdits {
text: String,
offset: TextUnit,
edits: Vec<AtomTextEdit>,
}
fn arb_text_with_offset_and_edits() -> BoxedStrategy<ArbTextWithOffsetAndEdits> {
arb_text()
.prop_flat_map(|text| {
(arb_offset(&text), arb_edits(&text), Just(text)).prop_map(
|(offset, edits, text)| ArbTextWithOffsetAndEdits {
text,
offset,
edits,
},
)
})
.boxed()
}
proptest! {
#[test]
fn test_translate_offset_with_edit(x in arb_text_with_offset_and_edits()) {
let line_index = LineIndex::new(&x.text);
let expected = translate_after_edit(&x.text, x.offset, x.edits.clone());
let actual_lines = count_newlines(x.offset, &line_index, &x.edits);
assert_eq!(actual_lines, expected.line);
}
}
}
|