// Peek one char ahead
private char32 PeekChar()
{
if (_preview1 == null)
{
var saved = _current;
NextChar();
_preview1 = _current;
_current = saved;
}
return(_preview1.Value.CurrentChar);
}
private void Reset()
{
// Initialize the position at -1 when starting
_preview1 = null;
_current = new LexerInternalState {
Position = new TextPosition(_reader.Start, 0, 0)
};
// It is important to initialize this separately from the previous line
_current.CurrentChar = NextCharFromReader();
_token = new SyntaxTokenValue();
_errors = null;
}
private void NextChar()
{
// If we have a character in preview
if (_preview1 != null)
{
_current = _preview1.Value;
_preview1 = null;
return;
}
// Else move to the next position
_current.Position = _current.NextPosition;
_current.PreviousChar = _current.CurrentChar; // save the previous character
_current.CurrentChar = NextCharFromReader();
}