private static bool TryReadNumberToken(PositionedChar[] chars, ref int index, out NumberToken token)
{
int startIndex = index;
List <PositionedChar> tokenChars = new List <PositionedChar>();
bool read;
char c;
do
{
c = chars[index].Value;
read = char.IsDigit(c) || c == '.';
if (read)
{
tokenChars.Add(chars[index]);
index++;
}
}while (read && index < chars.Length);
if (!tokenChars.Any() || (tokenChars.Count == 1 && tokenChars[0].Value == '.'))
{
index = startIndex;
token = null;
return(false);
}
string readString = PositionedChar.CreateString(tokenChars);
if (double.TryParse(readString, NumberToken.AllowedStyle, CultureInfo.InvariantCulture, out double d))
{
token = new NumberToken(chars[startIndex].Index, chars[index - 1].Index, d);
return(true);
}
index = startIndex;
token = null;
return(false);
}
private static bool TryReadPropertyToken(PositionedChar[] chars, ref int index, out PropertyToken token)
{
int startIndex = index;
bool read;
char c;
List <PositionedChar> currentValue = new List <PositionedChar>();
do
{
c = chars[index].Value;
read = char.IsLetter(c) || c == '$' || c == '_';
if (!read && currentValue.Any() && char.IsDigit(c))
{
read = true;
}
if (read)
{
currentValue.Add(chars[index]);
index++;
}
}while (read && index < chars.Length);
if (currentValue.Any())
{
token = new PropertyToken(chars[startIndex].Index, chars[index - 1].Index, PositionedChar.CreateString(currentValue), false);
return(true);
}
token = null;
index = startIndex;
return(false);
}