dartdiff

Pure Dart text differencing and unified patching inspired by jsdiff.

Implemented APIs

• diffChars
• diffWords
• diffWordsWithSpace
• diffLines
• diffTrimmedLines
• diffSentences
• diffCss
• diffJson
• diffArrays
• structuredPatch
• createPatch
• createTwoFilesPatch
• formatPatch
• parsePatch
• applyPatch
• applyPatches
• reversePatch
• unixToWin / winToUnix / isUnix / isWin
• convertChangesToDMP / convertChangesToXML

Usage

import 'package:dartdiff/dartdiff.dart';

void main() {
  final changes = diffChars('Old Value.', 'New ValueMoreData.');
  if (changes != null) {
    print(convertChangesToXML(changes));
  }

  final patch = createPatch('file.txt', 'a\nb\n', 'a\nc\n');
  if (patch != null) {
    final patched = applyPatch('a\nb\n', patch);
    print(patched); // a\nc\n
  }
}

Notes

• Diff functions return null when maxEditLength or timeout aborts computation.
• applyPatch returns null when a patch cannot be applied.
• A custom wordTokenizer hook is available on diffWords to customize tokenization.

Upstream jsdiff Test Corpus

dartdiff includes a converted fixture derived from the upstream jsdiff test corpus:

• Fixture: test/data/upstream_cases.json
• Dart replay test: test/upstream_converted_cases_test.dart
• Fixture integrity test: test/upstream_parity_test.dart

Fixture regeneration utilities are still available under tool/parity/ (Node + jsdiff harness) when you want to refresh against upstream.