public bool CanTraverse(Matcher.MatchMode mode,
string input, int position, bool ignoreCase,
out Label output, out bool consumedInput)
{
consumedInput = false;
output = null;
Label matchLabel;
Label outputLabel;
switch (mode)
{
case Matcher.MatchMode.Analyse:
matchLabel = _Input;
outputLabel = _Output;
break;
case Matcher.MatchMode.Generate:
matchLabel = _Output;
outputLabel = _Input;
break;
default:
throw new Exception("Illegal case constant");
}
if (matchLabel.Matches(input, position, ignoreCase))
{
consumedInput = matchLabel.IsConsuming;
output = outputLabel;
return true;
}
else
return false;
}
/// <summary>
/// Attempts to traverse the specified transition, given the current match state.
/// </summary>
/// <param name="input">The string input</param>
/// <param name="t">The transition to probe</param>
/// <param name="mode">The match mode</param>
/// <returns>The new match state or null if the transition cannot be traversed</returns>
public MatchState Traverse(string input, FSTTransition t, Matcher.MatchMode mode, bool ignoreCase)
{
#if false
bool consumed;
Label output;
if (t.CanTraverse(mode, input, _InputPosition, ignoreCase, out output, out consumed))
{
MatchState result = new MatchState(this);
result._State = t.Target;
result.AppendOutput(output);
if (consumed)
{
++result._ConsumedSymbols;
++result._InputPosition;
}
return(result);
}
else
{
return(null);
}
#else
Label matchLabel;
Label outputLabel;
switch (mode)
{
case Matcher.MatchMode.Analyse:
matchLabel = t.Input;
outputLabel = t.Output;
break;
case Matcher.MatchMode.Generate:
matchLabel = t.Output;
outputLabel = t.Input;
break;
default:
throw new Exception("Illegal case constant");
}
if (matchLabel.Matches(input, _InputPosition, ignoreCase))
{
MatchState result = new MatchState(this);
result._State = t.Target;
if (outputLabel.IsConsuming)
{
result._Output.Add(outputLabel);
}
if (matchLabel.IsConsuming)
{
++result._ConsumedSymbols;
++result._InputPosition;
}
return(result);
}
return(null);
#endif
}
