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 v2

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SymPrinting.java

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package symjava.symbolic;

public class SymPrinting {

public static int getPrecedence(Expr expr) {

if(expr instanceof Sum)

return 5;

else if(expr instanceof Add || expr instanceof Subtract)

return 10;

if(expr instanceof Multiply || expr instanceof Divide || expr instanceof Negate)

return 20;

if( expr instanceof Reciprocal )

return 25;

if(expr instanceof Pow)

return 30;

if(expr instanceof Func) {

Func f = (Func)expr;

if(f.isAbstract())

return 90;

else

return getPrecedence(f.getExpr());

}

if(expr instanceof Symbol || expr instanceof Symbols || expr instanceof SymReal<?>)

return 100;

return 1000; //default to atomic

}

public static String addParenthsesIfNeeded(Expr toMe, Expr forOperation) {

if(getPrecedence(toMe) < getPrecedence(forOperation))

return "(" + toMe.toString() + ")";

return toMe.toString();

}

public static String addParenthsesIfNeeded2(Expr toMe, Expr forOperation) {

if(getPrecedence(toMe) <= getPrecedence(forOperation))

return "(" + toMe.toString() + ")";

return toMe.toString();

}

public static String join(Expr[] exprs,String deliminator) {

StringBuilder sb = new StringBuilder();

for(Expr e : exprs) {

sb.append(e.toString());

sb.append(deliminator);

}

return sb.substring(0, sb.length()-deliminator.length());

}

}