protected void Reset(ref ResetPoint point)
{
var offset = point.Position - _firstToken;
RoslynDebug.Assert(offset >= 0);
if (offset >= _tokenCount)
{
// Re-fetch tokens to the position in the reset point
PeekToken(offset - _tokenOffset);
// Re-calculate new offset in case tokens got shifted to the left while we were peeking.
offset = point.Position - _firstToken;
}
RoslynDebug.Assert(offset >= 0 && offset < _tokenCount);
_tokenOffset = offset;
_currentToken = null;
_currentNode = default(BlendedNode);
_prevTokenTrailingTrivia = point.PrevTokenTrailingTrivia;
if (_blendedTokens != null)
{
// look forward for slots not holding a token
for (var i = _tokenOffset; i < _tokenCount; i++)
{
if (_blendedTokens[i].Token == null)
{
// forget anything after and including any slot not holding a token
_tokenCount = i;
if (_tokenCount == _tokenOffset)
{
FetchCurrentToken();
}
break;
}
}
}
}
protected GreenNode EatNode()
{
// we will fail anyways. Assert is just to catch that earlier.
RoslynDebug.Assert(_blendedTokens != null);
// remember result
var result = CurrentNode.Green;
// store possible non-token in token sequence
if (_tokenOffset >= _blendedTokens.Length)
{
AddTokenSlot();
}
_blendedTokens[_tokenOffset++] = _currentNode;
_tokenCount = _tokenOffset; // forget anything after this slot
// erase current state
_currentNode = default(BlendedNode);
_currentToken = null;
return(result);
}
