public void diff_deltaTest()
{
diff_match_patchTest dmp = new diff_match_patchTest();
// Convert a diff into delta string.
List<Diff> diffs = new List<Diff> {
new Diff(Operation.EQUAL, "jump"),
new Diff(Operation.DELETE, "s"),
new Diff(Operation.INSERT, "ed"),
new Diff(Operation.EQUAL, " over "),
new Diff(Operation.DELETE, "the"),
new Diff(Operation.INSERT, "a"),
new Diff(Operation.EQUAL, " lazy"),
new Diff(Operation.INSERT, "old dog")};
string text1 = dmp.DiffText1(diffs);
Assert.AreEqual("jumps over the lazy", text1);
string delta = dmp.DiffToDelta(diffs);
Assert.AreEqual("=4\t-1\t+ed\t=6\t-3\t+a\t=5\t+old dog", delta);
// Convert delta string into a diff.
CollectionAssert.AreEqual(diffs, dmp.DiffFromDelta(text1, delta));
// Generates error (19 < 20).
try {
dmp.DiffFromDelta(text1 + "x", delta);
Assert.Fail("DiffFromDelta: Too long.");
} catch (ArgumentException) {
// Exception expected.
}
// Generates error (19 > 18).
try {
dmp.DiffFromDelta(text1.Substring(1), delta);
Assert.Fail("DiffFromDelta: Too short.");
} catch (ArgumentException) {
// Exception expected.
}
// Generates error (%c3%xy invalid Unicode).
try {
dmp.DiffFromDelta("", "+%c3%xy");
Assert.Fail("DiffFromDelta: Invalid character.");
} catch (ArgumentException) {
// Exception expected.
}
// Test deltas with special characters.
char zero = (char)0;
char one = (char)1;
char two = (char)2;
diffs = new List<Diff> {
new Diff(Operation.EQUAL, "\u0680 " + zero + " \t %"),
new Diff(Operation.DELETE, "\u0681 " + one + " \n ^"),
new Diff(Operation.INSERT, "\u0682 " + two + " \\ |")};
text1 = dmp.DiffText1(diffs);
Assert.AreEqual("\u0680 " + zero + " \t %\u0681 " + one + " \n ^", text1);
delta = dmp.DiffToDelta(diffs);
// Lowercase, due to UrlEncode uses lower.
Assert.AreEqual("=7\t-7\t+%da%82 %02 %5c %7c", delta, "DiffToDelta: Unicode.");
CollectionAssert.AreEqual(diffs, dmp.DiffFromDelta(text1, delta), "DiffFromDelta: Unicode.");
// Verify pool of unchanged characters.
diffs = new List<Diff> {
new Diff(Operation.INSERT, "A-Z a-z 0-9 - _ . ! ~ * ' ( ) ; / ? : @ & = + $ , # ")};
string text2 = dmp.DiffText2(diffs);
Assert.AreEqual("A-Z a-z 0-9 - _ . ! ~ * \' ( ) ; / ? : @ & = + $ , # ", text2, "DiffText2: Unchanged characters.");
delta = dmp.DiffToDelta(diffs);
Assert.AreEqual("+A-Z a-z 0-9 - _ . ! ~ * \' ( ) ; / ? : @ & = + $ , # ", delta, "DiffToDelta: Unchanged characters.");
// Convert delta string into a diff.
CollectionAssert.AreEqual(diffs, dmp.DiffFromDelta("", delta), "DiffFromDelta: Unchanged characters.");
}