// consume text up to the next directive
private SyntaxNode LexDisabledText(out bool followedByDirective)
{
_start = _charReader.Position;
int lastLineStart = _charReader.Position;
bool allWhitespace = true;
while (true)
{
char ch = _charReader.Current;
switch (ch)
{
case '\0':
followedByDirective = false;
return(_charReader.Position - _start > 0 ? CreateDisabledText() : null);
case '#':
followedByDirective = true;
if (lastLineStart < _charReader.Position && !allWhitespace)
{
goto default;
}
_charReader.Reset(lastLineStart); // reset so directive parser can consume the starting whitespace on this line
return(_charReader.Position - _start > 0 ? CreateDisabledText() : null);
case '\r':
case '\n':
ReadEndOfLine();
lastLineStart = _charReader.Position;
allWhitespace = true;
break;
default:
allWhitespace = allWhitespace && char.IsWhiteSpace(ch);
NextChar();
break;
}
}
}
public void ResetShouldResetStreamPosition()
{
var stream = CharReaderTest.Sentinel.ToStream();
var reader = new CharReader(stream);
stream.Position.Should().Be(0);
reader.Take(3).Should().ContainInOrder('0', '1', '2');
stream.Position.Should().NotBe(0);
reader.Reset();
stream.Position.Should().Be(0);
reader.Take(3).Should().ContainInOrder('0', '1', '2');
}
