public exprAST parseExpr()
{
listAddopTermAST temp = null;
listAddopTermAST result = null;
termAST term = null;
addopAST addop = null;
termAST term2 = null;
//Expr = [ "-" ] Term { Addop Term }
Boolean ind = false;
Boolean ind2 = false;
if (currentToken.sym == sym.RES)
{
acceptIt();
ind = true;
}
term = parseTerm();
while (currentToken.sym == sym.SUM || currentToken.sym == sym.RES)
{
if (ind2 == false)
{
addop = parseAddop();
term2 = parseTerm();
result = new unAddopTermAST(addop, term2);
ind2 = true;
}
else
{
addop = parseAddop();
term2 = parseTerm();
temp = new unAddopTermAST(addop, term2);
result = new varAddopTermAST(result, temp);
}
}
if (ind == false && result == null)
{
return(new expreSoloTermAST(term));
}
else if (ind == true && result == null)
{
return(new exprNegativaTermAST(term));
}
else if (ind == false && result != null)
{
return(new exprAddopTermAST(term, result));
}
else if (ind == true && result != null)
{
return(new exprNegativaAddopTermAST(result, term));
}
return(null);
}
Object VisitUnAddopTermAST(unAddopTermAST var, object arg)
{
int numaux = ((Integer)arg).intValue(); printtab(numaux); System.out.println(c.getClass().getName()); if(c.- !=null) c.-.visit(this,new Integer(numaux+1)); else{printtab(numaux+1); Console.WriteLine(“NULL”);} return null;
}
public exprAST parseExpr()
{
listAddopTermAST temp=null;
listAddopTermAST result=null;
termAST term = null;
addopAST addop = null;
termAST term2 = null;
//Expr = [ "-" ] Term { Addop Term }
Boolean ind = false;
Boolean ind2 = false;
if (currentToken.sym == sym.RES)
{
acceptIt();
ind = true;
}
term = parseTerm();
while (currentToken.sym == sym.SUM || currentToken.sym == sym.RES)
{
if (ind2 == false)
{
addop = parseAddop();
term2 = parseTerm();
result = new unAddopTermAST(addop, term2);
ind2 = true;
}
else
{
addop = parseAddop();
term2 = parseTerm();
temp = new unAddopTermAST(addop, term2);
result = new varAddopTermAST(result, temp);
}
}
if (ind == false && result == null) {
return new expreSoloTermAST(term);
}
else if (ind == true && result == null)
{
return new exprNegativaTermAST(term);
}
else if (ind == false && result !=null)
{
return new exprAddopTermAST(term,result);
}
else if (ind == true && result != null)
{
return new exprNegativaAddopTermAST(result,term);
}
return null;
}
