Crate diff_match_patch 

Functions for diff, match and patch.

Computes the difference between two texts to create a patch. Applies the patch onto another text, allowing for errors.

All lengths in the delta and patch text wire formats count Unicode scalars, and the outputs are byte-compatible with Neil Fraser’s reference diff-match-patch for text where scalar and UTF-16 counts agree (the reference counts UTF-16 code units).

use diff_match_patch::Dmp;

let mut dmp = Dmp::new();
let mut diffs = dmp.diff_main("The quick brown fox.", "The quick red fox.", true);
assert_eq!(dmp.diff_text1(&mut diffs), "The quick brown fox.");
assert_eq!(dmp.diff_text2(&mut diffs), "The quick red fox.");

let mut patches = dmp.patch_make1("The quick brown fox.", "The quick red fox.");
let (patched, applied) = dmp.patch_apply(&mut patches, "The quick brown fox.");
assert_eq!(patched.into_iter().collect::<String>(), "The quick red fox.");
assert_eq!(applied, vec![true]);

With the grapheme feature enabled, Segmentation::Grapheme makes diffs treat extended grapheme clusters (emoji ZWJ sequences, flags, combining marks) as atomic:

use diff_match_patch::{Dmp, Segmentation};

let mut dmp = Dmp::new();
dmp.segmentation = Segmentation::Grapheme;
let diffs = dmp.diff_main("🇷🇺", "🇺🇸", false);
// The flags share a scalar but not a cluster: no boundary lands inside one.
assert_eq!(diffs.len(), 2);

Structs

Diff

Dmp

Patch

Enums

Segmentation

Which unit of text the diff engine treats as atomic.