public RqlToken Next()
{
if (stopToken != null)
{
return(stopToken);
}
if (nextToken != null)
{
RqlToken token = nextToken;
nextToken = null;
return(token);
}
char c = ReadChar();
while (c != '\0' && Char.IsWhiteSpace(c))
{
c = ReadChar();
}
int tokenOffset = this.offset - 1;
if (c == '\0')
{
return(stopToken = RqlToken.End(offset));
}
if (Char.IsLetter(c))
{
sb.Clear();
sb.Append(c);
c = ReadChar();
bool lastCharWasDot = false;
while (c != 0 && (Char.IsLetterOrDigit(c)) || c == '.')
{
sb.Append(c);
if (c == '.')
{
if (lastCharWasDot)
{
goto Error;
}
lastCharWasDot = true;
}
else
{
lastCharWasDot = false;
}
c = ReadChar();
}
UnreadChar();
string s = sb.ToString();
if (s == "true")
{
return(RqlToken.Constant(tokenOffset, (object)true));
}
else if (s == "false")
{
return(RqlToken.Constant(tokenOffset, (object)false));
}
else if (s == "null")
{
return(RqlToken.Constant(tokenOffset, null));
}
else
{
return(RqlToken.Identifier(tokenOffset, s));
}
}
else if (Char.IsDigit(c) || c == '-')
{
sb.Clear();
sb.Append(c);
c = ReadChar();
if (sb[0] == '-' && !Char.IsDigit(c))
{
goto Error;
}
while (Char.IsDigit(c))
{
sb.Append(c);
c = ReadChar();
}
if (c == '.')
{
sb.Append(c);
c = ReadChar();
while (Char.IsDigit(c))
{
sb.Append(c);
c = ReadChar();
}
UnreadChar();
Double n;
if (Double.TryParse(sb.ToString(), out n))
{
return(RqlToken.Constant(tokenOffset, n));
}
}
else
{
UnreadChar();
Int32 n;
if (Int32.TryParse(sb.ToString(), out n))
{
return(RqlToken.Constant(tokenOffset, n));
}
}
}
else if (c == '$')
{
sb.Clear();
sb.Append(c);
c = ReadChar();
while (Char.IsLetterOrDigit(c))
{
sb.Append(c);
c = ReadChar();
}
UnreadChar();
if (sb.Length > 0)
{
return(RqlToken.Constant(tokenOffset, new RqlId(sb.ToString())));
}
}
else if (c == '@')
{
sb.Clear();
sb.Append(c);
c = ReadChar();
while (c != 'Z')
{
sb.Append(c);
c = ReadChar();
}
sb.Append(c);
RqlDateTime dateTime;
if (RqlDateTime.TryParse(sb.ToString(), out dateTime))
{
return(RqlToken.Constant(tokenOffset, dateTime));
}
}
else if (c == '~')
{
sb.Clear();
sb.Append(c);
c = ReadChar();
while (c != 'S')
{
sb.Append(c);
c = ReadChar();
}
sb.Append(c);
RqlTimeSpan timeSpan;
if (RqlTimeSpan.TryParse(sb.ToString(), out timeSpan))
{
return(RqlToken.Constant(tokenOffset, timeSpan));
}
}
else if (c == '\'')
{
sb.Clear();
c = ReadChar();
while (c != '\0' && c != '\'')
{
sb.Append(c);
c = ReadChar();
}
if (c == '\'')
{
return(RqlToken.Constant(tokenOffset, sb.ToString()));
}
}
else
{
switch ((char)c)
{
case ',':
return(RqlToken.Comma(tokenOffset));
case '(':
return(RqlToken.LeftParen(tokenOffset));
case ')':
return(RqlToken.RightParen(tokenOffset));
}
}
Error:
return(stopToken = RqlToken.Error(tokenOffset));
}
