private bool CanTokenBeFollowedByToken(ObjectPlacementPathHeightPatternToken token, ObjectPlacementPathHeightPatternToken nextToken)
{
if (nextToken.IsWhitespace())
{
return(true);
}
if (token.IsClosingParanthesis())
{
return(nextToken.IsComma());
}
if (token.IsOpeningParenthesis())
{
return(nextToken.IsDigit() || nextToken.IsMinusSign());
}
if (token.IsComma())
{
return(nextToken.IsDigit() || nextToken.IsLetter() || nextToken.IsMinusSign());
}
if (token.IsDigit())
{
return(nextToken.IsDigit() || nextToken.IsComma() || nextToken.IsClosingParanthesis());
}
if (token.IsLetter())
{
return(nextToken.IsOpeningParenthesis());
}
return(true);
}
private bool ValidateNoDigitsSeparatedByWhitespace(List <ObjectPlacementPathHeightPatternToken> patternTokens)
{
if (patternTokens.Count < 3)
{
return(true);
}
int currentTokenIndex = 0;
while (currentTokenIndex < patternTokens.Count)
{
// Find the first whitespace token which follows a digit
while (currentTokenIndex < patternTokens.Count)
{
ObjectPlacementPathHeightPatternToken token = patternTokens[currentTokenIndex];
if (token.IsWhitespace())
{
bool previousTokenIsDigit = currentTokenIndex != 0 && patternTokens[currentTokenIndex - 1].IsDigit();
if (previousTokenIsDigit)
{
break;
}
}
++currentTokenIndex;
}
// Find the first non-whitespace token. If the token following it is a digit, we have an invalid token sequence.
++currentTokenIndex;
while (currentTokenIndex < patternTokens.Count)
{
ObjectPlacementPathHeightPatternToken token = patternTokens[currentTokenIndex];
if (!token.IsWhitespace())
{
if (token.IsDigit())
{
LogInvalidSyntaxMessage("2 digits can not be separated by whitespace.");
return(false);
}
else
{
++currentTokenIndex;
break;
}
}
++currentTokenIndex;
}
}
return(true);
}