public void TestSeekOnANTLRInputStream()
{
Encoding encoding = Encoding.Unicode;
byte[] buffer = encoding.GetBytes("One\r\nTwo\r\nThree");
MemoryStream grammarStream = new MemoryStream(buffer);
ANTLRInputStream stream = new ANTLRInputStream(grammarStream, encoding);
Assert.AreEqual('O', stream.LA(1));
Assert.AreEqual(0, stream.Index);
Assert.AreEqual(0, stream.CharPositionInLine);
Assert.AreEqual(1, stream.Line);
stream.Seek(6);
Assert.AreEqual('w', stream.LA(1));
Assert.AreEqual(6, stream.Index);
Assert.AreEqual(1, stream.CharPositionInLine);
Assert.AreEqual(2, stream.Line);
stream.Seek(11);
Assert.AreEqual('h', stream.LA(1));
Assert.AreEqual(11, stream.Index);
Assert.AreEqual(1, stream.CharPositionInLine);
Assert.AreEqual(3, stream.Line);
// seeking backwards leaves state info (other than index in stream) unchanged
stream.Seek(1);
Assert.AreEqual('n', stream.LA(1));
Assert.AreEqual(1, stream.Index);
Assert.AreEqual(1, stream.CharPositionInLine);
Assert.AreEqual(3, stream.Line);
}
public void TestSeekOnANTLRInputStream()
{
Encoding encoding = Encoding.Unicode;
byte[] buffer = encoding.GetBytes("One\r\nTwo\r\nThree");
MemoryStream grammarStream = new MemoryStream(buffer);
ANTLRInputStream stream = new ANTLRInputStream(grammarStream, encoding);
Assert.AreEqual('O', stream.LA(1));
Assert.AreEqual(0, stream.Index());
Assert.AreEqual(0, stream.CharPositionInLine);
Assert.AreEqual(1, stream.Line);
stream.Seek(6);
Assert.AreEqual('w', stream.LA(1));
Assert.AreEqual(6, stream.Index());
Assert.AreEqual(1, stream.CharPositionInLine);
Assert.AreEqual(2, stream.Line);
stream.Seek(11);
Assert.AreEqual('h', stream.LA(1));
Assert.AreEqual(11, stream.Index());
Assert.AreEqual(1, stream.CharPositionInLine);
Assert.AreEqual(3, stream.Line);
// seeking backwards leaves state info (other than index in stream) unchanged
stream.Seek(1);
Assert.AreEqual('n', stream.LA(1));
Assert.AreEqual(1, stream.Index());
Assert.AreEqual(1, stream.CharPositionInLine);
Assert.AreEqual(3, stream.Line);
}
