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use difference::{Changeset, Difference};
use serde::{Deserialize, Serialize};
#[derive(Serialize, Deserialize, Debug)]
pub enum TextChange {
Inserted { at: usize, new_content: String },
Deleted { at: usize, upto: usize },
}
impl TextChange {
pub fn diff(old: &str, new: &str) -> Vec<Self> {
let change_set = Changeset::new(old, new, "");
let mut changes = Vec::new();
let mut at: usize = 0;
for diff in change_set.diffs.iter() {
match diff {
Difference::Add(new_content) => {
let change = TextChange::Inserted {
at,
new_content: new_content.to_owned(),
};
at += new_content.len();
changes.push(change);
}
Difference::Rem(removed_content) => {
changes.push(TextChange::Deleted {
at,
upto: removed_content.len(),
});
}
Difference::Same(same_content) => {
at += same_content.len();
}
}
}
changes
}
pub fn apply(&self, buffer: &mut String) {
match self {
TextChange::Deleted { at, upto } => {
buffer.replace_range(at..upto, "");
}
TextChange::Inserted { at, new_content } => {
buffer.insert_str(*at, new_content);
}
}
}
}
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