avrora.syntax
Class Expr.UnOp
java.lang.Object
avrora.syntax.ASTNode
avrora.syntax.Expr
avrora.syntax.Expr.UnOp
- Enclosing class:
- Expr
- public static class Expr.UnOp
- extends Expr
The UnOp
class represents an expression that is a single operand with a unary operation
applied to it. For example, "!" takes the logical complement of an operand, "~" takes the bitwise
complement, etc.
Method Summary |
int |
evaluate(int currentByteAddress,
Context c)
The evaluate() method computes the value of the expression in this context and returns
its value. |
AbstractToken |
getLeftMostToken()
The getLeftMostToken() method gets the first token associated with the abstract syntax
tree node. |
AbstractToken |
getRightMostToken()
The getRightMostToken() method gets the last token associated with the abstract syntax
tree node. |
java.lang.String |
toString()
|
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
op
public final AbstractToken op
operand
public final Expr operand
Expr.UnOp
public Expr.UnOp(AbstractToken tok,
Expr oper)
evaluate
public int evaluate(int currentByteAddress,
Context c)
- The
evaluate()
method computes the value of the expression in this context and returns
its value. This implementation works straightforwardly by first evaluating the operand and then
computing the result of the arithmetic operation.
- Specified by:
evaluate
in class Expr
- Parameters:
currentByteAddress
- the current byte address within the programc
- the context in which to evaluate this expression
- Returns:
- the value of the expression as a 32-bit integer
getLeftMostToken
public AbstractToken getLeftMostToken()
- Description copied from class:
ASTNode
- The
getLeftMostToken()
method gets the first token associated with the abstract syntax
tree node.
- Specified by:
getLeftMostToken
in class ASTNode
- Returns:
- an
AbstractToken
instance representing the first token that is a part of this
syntactic item.
getRightMostToken
public AbstractToken getRightMostToken()
- Description copied from class:
ASTNode
- The
getRightMostToken()
method gets the last token associated with the abstract syntax
tree node.
- Specified by:
getRightMostToken
in class ASTNode
- Returns:
- an
AbstractToken
instance representing the last token that is a part of this
syntactic item.
toString
public java.lang.String toString()