Language: Dart

Each language port of Diff Match Patch uses the same API. These are the language-specific notes regarding Dart.

Dart can either be run in the Dart VM, or it may be compiled to JavaScript. Note that in the latter case, there's already a version of this library natively written in JavaScript.

Hello World

Here's a minimal example of a diff in Dart:

import 'DiffMatchPatch.dart';

void main() {
  DiffMatchPatch dmp = new DiffMatchPatch();
  List<Diff> d = dmp.diff_main('Hello World.', 'Goodbye World.');
  // Result: [(-1, "Hell"), (1, "G"), (0, "o"), (1, "odbye"), (0, " World.")]
  dmp.diff_cleanupSemantic(d);
  // Result: [(-1, "Hello"), (1, "Goodbye"), (0, " World.")]
  print(d);
}

Go to the dart directory and save the above program as hello.dart. Then execute dart hello.dart.

Tests

Unit tests can be performed from the dart/tests directory by executing dart DiffMatchPatchTest.dart. All tests should pass.

Speed test for diff can be performed from the dart/tests directory by executing dart SpeedtestVM.dart.

Alternatively, the speed test can be compiled to JavaScript. Go to the dart/tests directory and execute dart2js -O4 --out=Speedtest.dart.js Speedtest.dart, then open dart/tests/Speedtest.html in a browser.