private TokenOperator ParseOperator()
{
int start = d_pos;
char c = d_text[d_pos];
TokenOperator.OperatorType type = TokenOperator.OperatorType.None;
if (d_pos + 1 < d_text.Length)
{
char n = d_text[d_pos + 1];
if (c == '*' && n == '*')
{
type = TokenOperator.OperatorType.Power;
}
else if (c == '=' && n == '=')
{
type = TokenOperator.OperatorType.Equal;
}
else if (c == '>' && n == '=')
{
type = TokenOperator.OperatorType.GreaterOrEqual;
}
else if (c == '<' && n == '=')
{
type = TokenOperator.OperatorType.LessOrEqual;
}
else if (c == '|' && n == '|')
{
type = TokenOperator.OperatorType.Or;
}
else if (c == '&' && n == '&')
{
type = TokenOperator.OperatorType.And;
}
else if (c == '.' && n == '.')
{
type = TokenOperator.OperatorType.Range;
}
if (type != TokenOperator.OperatorType.None)
{
d_pos += 2;
return(new TokenOperator(type, d_text.Substring(start, 2)));
}
}
++d_pos;
switch (c)
{
case '*':
type = TokenOperator.OperatorType.Multiply;
break;
case '/':
type = TokenOperator.OperatorType.Divide;
break;
case '%':
type = TokenOperator.OperatorType.Modulo;
break;
case '-':
type = TokenOperator.OperatorType.Minus;
break;
case '+':
type = TokenOperator.OperatorType.Plus;
break;
case '!':
type = TokenOperator.OperatorType.Negate;
break;
case '>':
type = TokenOperator.OperatorType.Greater;
break;
case '<':
type = TokenOperator.OperatorType.Less;
break;
case '^':
type = TokenOperator.OperatorType.Power;
break;
case '~':
type = TokenOperator.OperatorType.Complement;
break;
case '?':
type = TokenOperator.OperatorType.TernaryTrue;
break;
case ':':
type = TokenOperator.OperatorType.TernaryFalse;
break;
case '(':
type = TokenOperator.OperatorType.GroupStart;
break;
case ')':
type = TokenOperator.OperatorType.GroupEnd;
break;
case '[':
type = TokenOperator.OperatorType.VectorStart;
break;
case ']':
type = TokenOperator.OperatorType.VectorEnd;
break;
case ',':
type = TokenOperator.OperatorType.Comma;
break;
}
if (type == TokenOperator.OperatorType.None)
{
return(null);
}
return(new TokenOperator(type, d_text.Substring(start, 1)));
}
public static Function LookupOperator(TokenOperator.OperatorType type, int arity)
{
switch (type)
{
case TokenOperator.OperatorType.Plus:
return(LookupFunction("plus", arity));
case TokenOperator.OperatorType.Minus:
return(LookupFunction("minus", arity));
case TokenOperator.OperatorType.Multiply:
return(LookupFunction("multiply", arity));
case TokenOperator.OperatorType.Divide:
return(LookupFunction("divide", arity));
case TokenOperator.OperatorType.Modulo:
return(LookupFunction("modulo", arity));
case TokenOperator.OperatorType.Less:
return(LookupFunction("less", arity));
case TokenOperator.OperatorType.Greater:
return(LookupFunction("greater", arity));
case TokenOperator.OperatorType.LessOrEqual:
return(LookupFunction("lessorequal", arity));
case TokenOperator.OperatorType.GreaterOrEqual:
return(LookupFunction("greaterorequal", arity));
case TokenOperator.OperatorType.Equal:
return(LookupFunction("equal", arity));
case TokenOperator.OperatorType.Negate:
return(LookupFunction("negate", arity));
case TokenOperator.OperatorType.And:
return(LookupFunction("and", arity));
case TokenOperator.OperatorType.Or:
return(LookupFunction("or", arity));
case TokenOperator.OperatorType.Power:
return(LookupFunction("pow", arity));
case TokenOperator.OperatorType.Range:
return(LookupFunction("range", arity));
case TokenOperator.OperatorType.UnaryPlus:
return(LookupFunction("unaryplus", arity));
case TokenOperator.OperatorType.UnaryMinus:
return(LookupFunction("unaryminus", arity));
case TokenOperator.OperatorType.Ternary:
return(LookupFunction("ternary", arity));
case TokenOperator.OperatorType.Complement:
return(LookupFunction("complement", arity));
}
return(null);
}
