private InferResult InferMatch(int inputIndex, Token elementType, HashSet <char> invalidChars)
{
InferResult result = new InferResult();
char currentInputChar = InputString[inputIndex];
result.Ch = currentInputChar;
switch (elementType)
{
case Token.Digit:
TryFixupDigit(inputIndex, currentInputChar, elementType, result, invalidChars);
break;
case Token.Alpha:
if (char.IsLetter(currentInputChar) == false && DetectAlphabetFixup(InputString, inputIndex) == FixupType.None)
{
result.IsNoMatch = true;
}
else
{
int newOffset = 1;
result.IsFixedUp = true;
char ch = AlphabetFixup(inputIndex, ref newOffset);
if (invalidChars.Contains(ch))
{
result.IsFixedUp = false;
result.IsNoMatch = true;
return(result);
}
result.Ch = ch;
result.NewOffset = newOffset;
}
break;
case Token.Both:
AmbiguousResult ambiguousResult = CheckAmbiguous(ref inputIndex);
result.Ch = ambiguousResult.Ch;
if (ambiguousResult.IsAmbiguous)
{
result.IsAmbiguous = true;
}
else
{
TryFixupDigit(inputIndex, currentInputChar, elementType, result, invalidChars);
}
break;
default:
break;
}
return(result);
}
private void TryFixupDigit(int inputIndex, char currentInputChar, Token elementType, InferResult result, HashSet <char> invalidChars)
{
int newOffset = 1;
result.IsFixedUp = DetectDigitFixup(InputString, inputIndex);
if (char.IsDigit(currentInputChar) == false && !result.IsFixedUp)
{
if (elementType == Token.Digit)
{
result.IsNoMatch = true;
}
}
else if (result.IsFixedUp)
{
char ch = DigitFixup(inputIndex, ref newOffset);
if (invalidChars.Contains(ch))
{
result.IsNoMatch = true;
}
else
{
result.Ch = ch;
result.NewOffset = newOffset;
}
}
}
