v8/test/mjsunit/debug-liveedit-diff.js

// Copyright 2010 the V8 project authors. All rights reserved.
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// Flags: --expose-debug-as debug
// Get the Debug object exposed from the debug context global object.

Debug = debug.Debug

function CheckCompareOneWay(s1, s2) {
  var diff_array = Debug.LiveEdit.CompareStringsLinewise(s1, s2);

  var pos1 = 0;
  var pos2 = 0;
  print("Compare:");
  for (var i = 0; i < diff_array.length; i += 3) {
    var similar_length = diff_array[i] - pos1;
    assertEquals(s1.substring(pos1, pos1 + similar_length),
                 s2.substring(pos2, pos2 + similar_length));

    print(s1.substring(pos1, pos1 + similar_length));
    pos1 += similar_length;
    pos2 += similar_length;
    print("<<< " + pos1 + " " + diff_array[i + 1]);
    print(s1.substring(pos1, pos1 + diff_array[i + 1]));
    print("===");
    print(s2.substring(pos2, pos2 + diff_array[i + 2]));
    print(">>> " + pos2 + " " + diff_array[i + 2]);
    pos1 += diff_array[i + 1];
    pos2 += diff_array[i + 2];
  }
  {
    // After last change
    var similar_length = s1.length - pos1;
    assertEquals(similar_length, s2.length - pos2);
    assertEquals(s1.substring(pos1, pos1 + similar_length),
                 s2.substring(pos2, pos2 + similar_length));

    print(s1.substring(pos1, pos1 + similar_length));
  }
  print("");
}

function CheckCompare(s1, s2) {
  CheckCompareOneWay(s1, s2);
  CheckCompareOneWay(s2, s1);
}

CheckCompare("", "");

CheckCompare("a", "b");

CheckCompare(
    "yesterday\nall\nmy\ntroubles\nseemed\nso\nfar\naway",
    "yesterday\nall\nmy\ntroubles\nseem\nso\nfar\naway"
);

CheckCompare(
    "yesterday\nall\nmy\ntroubles\nseemed\nso\nfar\naway",
    "\nall\nmy\ntroubles\nseemed\nso\nfar\naway"
);

CheckCompare(
    "yesterday\nall\nmy\ntroubles\nseemed\nso\nfar\naway",
    "all\nmy\ntroubles\nseemed\nso\nfar\naway"
);

CheckCompare(
    "yesterday\nall\nmy\ntroubles\nseemed\nso\nfar\naway",
    "yesterday\nall\nmy\ntroubles\nseemed\nso\nfar\naway\n"
);

CheckCompare(
    "yesterday\nall\nmy\ntroubles\nseemed\nso\nfar\naway",
    "yesterday\nall\nmy\ntroubles\nseemed\nso\n"
);