ExpressionPrinter

The ExpressionPrinter is used for string serialization of a given Expression.

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package printer;

import expression.*;
import interpreter.Visitor;

The ExpressionPrinter implements the string serialization with the help of the Visitor.

public class ExpressionPrinter extends Visitor<String> {
    public String visitAddition(Addition addition) {
        return visit(addition.leftHandSide) + " + " + visit(addition.rightHandSide);
    }

    public String visitIdentifier(Identifier identifier) {
        return identifier.name;
    }

    public String visitInt(Int integer) {
        return Integer.toString(integer.value);
    }

    public String visitSubtraction(Subtraction subtraction) {
        return visit(subtraction.leftHandSide) + " - " + visit(subtraction.rightHandSide);
    }

The print function takes an Expression instance as an argument and returns the string serialization of the given expression.

    public String print(Expression expression) {
        return visit(expression);
    }
}