public void NestedBacktracking()
{
var program = "x = '4' | '5'";
var enumerator = new ProgramEnumerator(program);
Assert.AreEqual(true, enumerator.Matches("x"));
enumerator.Advance(1);
Assert.AreEqual(true, enumerator.Matches(" = "));
enumerator.Advance(3);
enumerator.SetBacktrackPoint();
Assert.AreEqual(true, enumerator.Matches("'4'"));
enumerator.Advance(3);
enumerator.SetBacktrackPoint();
Assert.AreEqual(false, enumerator.Matches(" / "));
enumerator.Advance(3);
enumerator.Backtrack();
Assert.AreEqual(true, enumerator.Matches(" | "));
enumerator.Advance(3);
Assert.AreEqual(false, enumerator.Matches(")"));
enumerator.Advance(1);
enumerator.Backtrack();
Assert.AreEqual(true, enumerator.Matches("'4' | '5'"));
enumerator.Advance(9);
Assert.AreEqual(true, enumerator.IsFinished);
}
public void Backtracking()
{
var program = "func FuncName = 3 * 4";
var enumerator = new ProgramEnumerator(program);
Assert.AreEqual(true, enumerator.Matches("func"));
enumerator.Advance(4);
Assert.AreEqual(true, enumerator.Matches(" "));
enumerator.Advance(1);
Assert.AreEqual(true, enumerator.Matches("FuncName"));
enumerator.Advance(8);
Assert.AreEqual(true, enumerator.Matches(" "));
enumerator.Advance(1);
enumerator.SetBacktrackPoint();
Assert.AreEqual(false, enumerator.Matches("'"));
enumerator.Advance(1);
enumerator.Backtrack();
Assert.AreEqual(true, enumerator.Matches("="));
enumerator.Advance(1);
Assert.AreEqual(true, enumerator.Matches(" "));
enumerator.Advance(1);
Assert.AreEqual(true, enumerator.Matches("3"));
enumerator.Advance(1);
Assert.AreEqual(true, enumerator.Matches(" "));
enumerator.Advance(1);
Assert.AreEqual(true, enumerator.Matches("*"));
enumerator.Advance(1);
Assert.AreEqual(true, enumerator.Matches(" "));
enumerator.Advance(1);
Assert.AreEqual(true, enumerator.Matches("4"));
enumerator.Advance(1);
Assert.AreEqual(true, enumerator.IsFinished);
}