public CodeSetShift(INode predecessor, CodeSetType codeSet, HighModeChange highModeChange) : base(predecessor)
{
_codeSet = codeSet;
_highModeChange = highModeChange;
FinalCodeSet = predecessor.FinalCodeSet;
Length = 1;
_highMode = highModeChange.Instantiate();
}
private void Apply(Symbol symbol, CodeSetType type)
{
_current = symbol;
_activeType = type;
_tempSet = null;
_activeCodeSet = _mapping.GetCodeSet(_activeType);
Consume();
}
public CodeSetStart(CodeSetType codeSet, int length, bool isTerminal, HighModeChange highModeChange)
{
_codeSet = codeSet;
_highModeChange = highModeChange;
_highMode = _highModeChange.Instantiate();
Length = length;
IsTerminal = isTerminal;
}
public CodeSetRun(INode predecessor, CodeSetType codeSet, int length, bool isTerminal,
HighModeChange highModeChange) : base(predecessor)
{
_highModeChange = highModeChange;
_needsChangeOfSet = predecessor.FinalCodeSet != codeSet;
FinalCodeSet = codeSet;
Length = length;
IsTerminal = isTerminal;
_highMode = highModeChange.Instantiate();
}
private void HandleShift(CodeSetType expectedCurrentSet, CodeSetType targetSet)
{
if (_tempSet.HasValue)
{
throw new CodeError("Already in a shifting state.");
}
if (_activeType != expectedCurrentSet)
{
throw new CodeError($"Cannot shift to {targetSet} from current code set {_activeType}");
}
_tempSet = targetSet;
_activeCodeSet = _mapping.GetCodeSet(_tempSet.Value);
Consume();
}
private void HandleCodeSetSwitch(CodeSetType target)
{
if (_tempSet.HasValue)
{
throw new CodeError("Cannot switch code set after shift.");
}
if (_activeType == target)
{
throw new CodeError("Redundant code set switch.");
}
_activeType = target;
_activeCodeSet = _mapping.GetCodeSet(_activeType);
Consume();
}
public ICodeSet GetCodeSet(CodeSetType type)
{
switch (type)
{
case CodeSetType.CodeA:
return(CodeA);
case CodeSetType.CodeB:
return(CodeB);
case CodeSetType.CodeC:
return(CodeC);
default:
throw new ArgumentOutOfRangeException(nameof(type), type, null);
}
}
