/// <summary>
/// Ends the lookahead.
/// </summary>
/// <param name="context">The context.</param>
private void EndLookahead(BacktrackContext context)
{
if (_backtrackStack.Count > 0 && ReferenceEquals(_backtrackStack.Peek(), context))
{
_backtrackStack.Pop();
_currentBufferPosition = context.BufferIndex;
_tracker.CurrentLocation = context.Location;
UpdateCurrentCharacter();
}
}
/// <inheritdoc />
public override IDisposable BeginLookahead()
{
if (Buffer == null)
{
Buffer = new StringBuilder();
}
if (!Buffering)
{
ExpandBuffer();
Buffering = true;
}
var context = new BacktrackContext
{
BufferIndex = _currentBufferPosition,
Location = CurrentLocation
};
_backtrackStack.Push(context);
return new DisposableAction(() => EndLookahead(context));
}
/// <inheritdoc />
public override IDisposable BeginLookahead()
{
if (Buffer == null)
{
Buffer = new StringBuilder();
}
if (!Buffering)
{
ExpandBuffer();
Buffering = true;
}
var context = new BacktrackContext
{
BufferIndex = _currentBufferPosition,
Location = CurrentLocation
};
_backtrackStack.Push(context);
return(new DisposableAction(() => EndLookahead(context)));
}
/// <summary>
/// Ends the lookahead.
/// </summary>
/// <param name="context">The context.</param>
private void EndLookahead(BacktrackContext context)
{
if (_backtrackStack.Count > 0 && ReferenceEquals(_backtrackStack.Peek(), context))
{
_backtrackStack.Pop();
_currentBufferPosition = context.BufferIndex;
_tracker.CurrentLocation = context.Location;
UpdateCurrentCharacter();
}
}