private Expression matchSTROPERATOR(Expression litr1)
{
int operator_indx = match((int)TokenTags.STROPERATOR);
Expression litr2 = expression();
if (litr2.Type == ExpressionTypes.Number)
{
litr2 = new StrExpr(Convert.ToString(litr2.Value()));
}
Expression oprtr;
switch (((Word)TokenList[operator_indx]).lexeme)
{
case "$+":
oprtr = new Pluss(ExpressionTypes.String, litr1, litr2);
break;
case "$==":
oprtr = new Equal(ExpressionTypes.String, litr1, litr2);
break;
case "$!=":
oprtr = new NotEqual(ExpressionTypes.String, litr1, litr2);
break;
default: throw new Exception("Fatal error: wrong operator");
}
return(oprtr);
}
private Expression matchBOPERATOR(Expression eNumb1)
{
int operator_indx = match((int)TokenTags.BOPERATOR);
Expression eNumb2 = expression();
if (eNumb2.Type == ExpressionTypes.String)
{
string err1 = "Syntax Error : must be Number";
throw new Exception(err1);
}
Expression oprtr;
switch (((Word)TokenList[operator_indx]).lexeme)
{
case "+":
oprtr = new Pluss(ExpressionTypes.Number, eNumb1, eNumb2);
break;
case "-":
oprtr = new Minus(eNumb1, eNumb2);
break;
case "*":
oprtr = new Mult(eNumb1, eNumb2);
break;
case "/":
oprtr = new Div(eNumb1, eNumb2);
break;
case ">":
oprtr = new Bigger(eNumb1, eNumb2);
break;
case "<":
oprtr = new Less(eNumb1, eNumb2);
break;
case ">=":
oprtr = new BiggerEqual(eNumb1, eNumb2);
break;
case "<=":
oprtr = new LessEqual(eNumb1, eNumb2);
break;
case "==":
oprtr = new Equal(ExpressionTypes.Number, eNumb1, eNumb2);
break;
case "!=":
oprtr = new NotEqual(ExpressionTypes.Number, eNumb1, eNumb2);
break;
default: throw new Exception("Fatal error: wrong operator");
}
return(oprtr);
}