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use {TextRange, TextUnit};
use libsyntax2::{
AtomEdit,
text_utils::contains_offset_nonstrict,
};
#[derive(Debug, Clone)]
pub struct Edit {
atoms: Vec<AtomEdit>,
}
#[derive(Debug)]
pub struct EditBuilder {
atoms: Vec<AtomEdit>
}
impl EditBuilder {
pub fn new() -> EditBuilder {
EditBuilder { atoms: Vec::new() }
}
pub fn replace(&mut self, range: TextRange, replace_with: String) {
self.atoms.push(AtomEdit::replace(range, replace_with))
}
pub fn delete(&mut self, range: TextRange) {
self.atoms.push(AtomEdit::delete(range))
}
pub fn insert(&mut self, offset: TextUnit, text: String) {
self.atoms.push(AtomEdit::insert(offset, text))
}
pub fn finish(self) -> Edit {
let mut atoms = self.atoms;
atoms.sort_by_key(|a| a.delete.start());
for (a1, a2) in atoms.iter().zip(atoms.iter().skip(1)) {
assert!(a1.delete.end() <= a2.delete.start())
}
Edit { atoms }
}
pub fn invalidates_offset(&self, offset: TextUnit) -> bool {
self.atoms.iter().any(|atom| contains_offset_nonstrict(atom.delete, offset))
}
}
impl Edit {
pub fn into_atoms(self) -> Vec<AtomEdit> {
self.atoms
}
pub fn apply(&self, text: &str) -> String {
let mut total_len = text.len();
for atom in self.atoms.iter() {
total_len += atom.insert.len();
total_len -= u32::from(atom.delete.end() - atom.delete.start()) as usize;
}
let mut buf = String::with_capacity(total_len);
let mut prev = 0;
for atom in self.atoms.iter() {
let start = u32::from(atom.delete.start()) as usize;
let end = u32::from(atom.delete.end()) as usize;
if start > prev {
buf.push_str(&text[prev..start]);
}
buf.push_str(&atom.insert);
prev = end;
}
buf.push_str(&text[prev..text.len()]);
assert_eq!(buf.len(), total_len);
buf
}
pub fn apply_to_offset(&self, offset: TextUnit) -> Option<TextUnit> {
let mut res = offset;
for atom in self.atoms.iter() {
if atom.delete.start() >= offset {
break;
}
if offset < atom.delete.end() {
return None
}
res += TextUnit::of_str(&atom.insert);
res -= atom.delete.len();
}
Some(res)
}
}
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