public void ScannerAccumulatesPartialLines()
{
var ls = new ByteArrayLineScanner(10); // deliberately small
AddBytes(ref ls, "012345");
Assert.False(ls.ScanToEndOfLine(out _));
Assert.Equal(6, ls.Count);
Assert.Equal(4, ls.Available);
AddBytes(ref ls, "6789");
Assert.False(ls.ScanToEndOfLine(out _));
Assert.Equal(0, ls.Count); // it moved the data elsewhere and cleared the buffer to make room for more
Assert.Equal(10, ls.Available);
AddBytes(ref ls, "abcd");
Assert.False(ls.ScanToEndOfLine(out _));
AddBytes(ref ls, "ef\ngh");
Assert.True(ls.ScanToEndOfLine(out var line1));
Assert.Equal("0123456789abcdef", line1.GetString());
Assert.Equal(2, ls.Count);
Assert.Equal(8, ls.Available);
AddBytes(ref ls, "\n");
Assert.True(ls.ScanToEndOfLine(out var line2));
Assert.Equal("gh", line2.GetString());
}
public void ScannerParsesLinesWithCR()
{
var ls = new ByteArrayLineScanner(100);
AddBytes(ref ls, "first line");
Assert.False(ls.ScanToEndOfLine(out _));
AddBytes(ref ls, " is good\rsecond");
Assert.True(ls.ScanToEndOfLine(out var line1));
Assert.Equal("first line is good", line1.GetString());
AddBytes(ref ls, " line is better\rthird line's the charm\r");
Assert.True(ls.ScanToEndOfLine(out var line2));
Assert.Equal("second line is better", line2.GetString());
// The last character in the buffer was a CR, so it can't say the line is done till it sees another byte.
Assert.False(ls.ScanToEndOfLine(out var _));
AddBytes(ref ls, "x");
Assert.True(ls.ScanToEndOfLine(out var line3));
Assert.Equal("third line's the charm", line3.GetString());
// The last character in the buffer was not a line ending, so it should not have reset the buffer
Assert.NotEqual(0, ls.Count);
Assert.NotEqual(ls.Capacity, ls.Available);
}
private static void AddBytes(ref ByteArrayLineScanner ls, string s)
{
var bytes = Encoding.UTF8.GetBytes(s);
Buffer.BlockCopy(bytes, 0, ls.Buffer, ls.Count, bytes.Length);
ls.AddedBytes(bytes.Length);
}
public void ScannerParsesLinesWithCRLF()
{
var ls = new ByteArrayLineScanner(100);
AddBytes(ref ls, "first line");
Assert.False(ls.ScanToEndOfLine(out _));
AddBytes(ref ls, " is good\r\nsecond");
Assert.True(ls.ScanToEndOfLine(out var line1));
Assert.Equal("first line is good", line1.GetString());
AddBytes(ref ls, " line is better\r\nthird line's the charm\r\n");
Assert.True(ls.ScanToEndOfLine(out var line2));
Assert.Equal("second line is better", line2.GetString());
Assert.True(ls.ScanToEndOfLine(out var line3));
Assert.Equal("third line's the charm", line3.GetString());
// The last character in the buffer was a line ending, so it should have reset the buffer
Assert.Equal(0, ls.Count);
Assert.Equal(ls.Capacity, ls.Available);
}
public void EmptyBufferReturnsFalse()
{
var ls = new ByteArrayLineScanner(100);
Assert.False(ls.ScanToEndOfLine(out _));
}
