54 lines
1.6 KiB
Rust
54 lines
1.6 KiB
Rust
//! Generate minimal `TextEdit`s from different text versions
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use dissimilar::Chunk;
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use ide::{TextEdit, TextRange, TextSize};
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pub(crate) fn diff(left: &str, right: &str) -> TextEdit {
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let chunks = dissimilar::diff(left, right);
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textedit_from_chunks(chunks)
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}
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fn textedit_from_chunks(chunks: Vec<dissimilar::Chunk>) -> TextEdit {
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let mut builder = TextEdit::builder();
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let mut pos = TextSize::default();
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let mut chunks = chunks.into_iter().peekable();
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while let Some(chunk) = chunks.next() {
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if let (Chunk::Delete(deleted), Some(&Chunk::Insert(inserted))) = (chunk, chunks.peek()) {
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chunks.next().unwrap();
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let deleted_len = TextSize::of(deleted);
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builder.replace(TextRange::at(pos, deleted_len), inserted.into());
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pos += deleted_len;
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continue;
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}
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match chunk {
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Chunk::Equal(text) => {
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pos += TextSize::of(text);
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}
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Chunk::Delete(deleted) => {
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let deleted_len = TextSize::of(deleted);
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builder.delete(TextRange::at(pos, deleted_len));
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pos += deleted_len;
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}
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Chunk::Insert(inserted) => {
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builder.insert(pos, inserted.into());
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}
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}
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}
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builder.finish()
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn diff_applies() {
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let mut original = String::from("fn foo(a:u32){\n}");
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let result = "fn foo(a: u32) {}";
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let edit = diff(&original, result);
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edit.apply(&mut original);
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assert_eq!(original, result);
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}
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}
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