Class ParenExpr

java.lang.Object
  extended by Expr
      extended by ParenExpr

public class ParenExpr
extends Expr

Our internal representation of a ParenExpr in the Q0 language. See http://www.radford.edu/itec380/2009fall-ibarland/Hw06/hw06.html

Version:
2015.Nov.15
Author:
Ian Barland

Field Summary
(package private)  Expr e
           
 
Fields inherited from class Expr
PUNCTUATION
 
Constructor Summary
ParenExpr(Expr _e)
           
 
Method Summary
 boolean equals(Object that)
           
 Value eval()
          Evaluate a given Expr.
 int hashCode()
           
 String toString()
          Return a String representation of this Expr.
 
Methods inherited from class Expr
parse, parse
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Field Detail

e

Expr e
Constructor Detail

ParenExpr

ParenExpr(Expr _e)
Method Detail

equals

public boolean equals(Object that)
Overrides:
equals in class Object

eval

public Value eval()
Description copied from class: Expr
Evaluate a given Expr.

Specified by:
eval in class Expr
Returns:
the Value this Expr evaluates to. (In O0, all values are numbers (doubles), but in O3 that will change, which is why we have pre-emptively made the return type 'Value'.)

hashCode

public int hashCode()
Overrides:
hashCode in class Expr

toString

public String toString()
Description copied from class: Expr
Return a String representation of this Expr. The result will be something which can be passed into 'parse(String)' to get the same Expr back. That is, toString and parse are inverses of each other.

Specified by:
toString in class Expr
Returns:
a String representation of this Expr.