| Lang. | Library | Diff Avg. | Patch Avg. | Bencher | Mode | Correct |

|:-------:|:----------------------------------------------------------------------------------------:|:---------:|:----------:|:----------:|:-----------:|:-------:|

[^1]: [diff-match-patch](https://www.npmjs.com/package/diff-match-patch) generated `patch text` and `delta` breaks on `unicode surrogates`.

Insert,

}

/// A structure representing a diff

/// (Ops::Delete, String::new("Hello")) means delete `Hello`

/// (Ops::Insert, String::new("Goodbye")) means add `Goodbye`

};

// pointless - two small for this algo

return None;

}

// First check if the second quarter is the seed for a half-match.

// let hm1 = Self::diff_half_match_i(long, short, (long.len() as f32 / 4.).ceil() as usize);

// Check again based on the third quarter.

// let hm2 = Self::diff_half_match_i(long, short, (long.len() as f32 / 2.).ceil() as usize);

if hm1.is_none() && hm2.is_none() {

return None;

let v_offset = (old_len + new_len + 1) >> 1; // same as `max_d`, (/ 2)

let v_len = v_offset << 1; // (* 2)

let mut v = vec![-1_isize; (v_len << 1) as usize];

let (v1, v2) = v.split_at_mut(v_len as usize);

{

let v_trg = v_offset as usize + 1;

while k1 < edit_dist + 1 - k1end {

let (x1, y1) = {

let k1_offset = v_offset + k1;

let v1_prev = if (1..v1.len() as isize).contains(&k1_offset) {

v1[k1_offset as usize - 1]

} else {

};

let mut y1 = x1 - k1;

let (xi, yi) = Self::bisect_fwd_path_i(old, new, x1 as usize, y1 as usize);

y1 = yi as isize;

x1 = xi as isize;

(x1, y1)

};

k1start += 2;

} else if front {

let k2_offset = v_offset + delta - k1;

// Mirror x2 onto top-left coordinate system.

let x2 = old_len - v2[k2_offset as usize];

if x1 >= x2 {

while k2 < edit_dist + 1 - k2end {

let (mut x2, y2) = {

let k2_offset = v_offset + k2;

let v2_prev = if (0..v2.len() as isize).contains(&(k2_offset - 1)) {

v2[k2_offset as usize - 1]

} else {

};

let mut y2 = x2 - k2;

let (xi, yi) = Self::bisect_rev_path_i(old, new, x2 as usize, y2 as usize);

y2 = yi as isize;

x2 = xi as isize;

k2start += 2;

} else if !front {

let k1_offset = v_offset + delta - k2;

let x1 = v1[k1_offset as usize];

let y1 = v_offset + x1 - k1_offset;

// Mirror x2 onto top-left coordinate system.

Ok(vec![Diff::delete(old), Diff::insert(new)])

}

fn bisect_fwd_path_i<'a, T: DType>(

old: &'a [T],

new: &'a [T],

) -> (usize, usize) {

let mut x1 = x1;

let mut y1 = y1;

while x1 < old.len() && y1 < new.len() {

if old[x1] != new[y1] {

}

(x1, y1)

}

fn bisect_rev_path_i<'a, T: DType>(

old: &'a [T],

new: &'a [T],

j += 1;

}

Some(HalfMatch {

prefix_long: best_long_a,

suffix_long: best_long_b,

pointmax = pointmid;

}

}

pointmid

}

fn common_overlap<T: DType>(lhs: &[T], rhs: &[T]) -> usize {

if lhs.is_empty() || rhs.is_empty() {

return 0;

}

// A working set with longer string truncated

let (l, r) = if lhs.len() > rhs.len() {

(&lhs[lhs.len() - rhs.len()..], rhs)

let mut len = 1;

let mut best = 0;

while let Some(found) = r

.windows(len)

.step_by(1)

let delete = diffs[pointer - 1].data().to_vec();

let insert = diffs[pointer].data().to_vec();

let overlap_1 = Self::common_overlap(&delete[..], &insert[..]);

let overlap_2 = Self::common_overlap(&insert[..], &delete[..]);

if let Some(le) = &mut last_eq {

if (pre_ins && pre_del && post_ins && post_del)

&& pre_ins as u8 + pre_del as u8 + post_ins as u8 + post_del as u8 == 3)

{

// Duplicate record.

.rev()

.position(|p| p == pattern)

.map(|p| text.len() - p - pattern.len())

{

padding += patch_margin;

//!

//! | Lang. | Library | Diff Avg. | Patch Avg. | Bencher | Mode | Correct |

//! |:-------:|:----------------------------------------------------------------------------------------:|:---------:|:----------:|:----------:|:-----------:|:-------:|

//! | `go` | [go-diff](https://github.com/sergi/go-diff) | 50.31 ms | 135.2 ms | go test | - | ✅ |

//! | `node` | [diff-match-patch](https://www.npmjs.com/package/diff-match-patch)[^1] | 246.90 ms | 1.07 ms | tinybench | - | ❌ |

//! | `python`| [diff-match-patch](https://pypi.org/project/diff-match-patch/) | 1.01 s | 0.25 ms | timeit | - | ✅ |