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.

Nested Class Summary

Nested classes inherited from class avrora.syntax.Expr

Expr.BinOp, Expr.CharLiteral, Expr.Constant, Expr.Func, Expr.RelativeAddress, Expr.StringLiteral, Expr.Term, Expr.UnOp, Expr.Variable

Field Summary

AbstractToken	op
Expr	operand

Constructor Summary

Expr.UnOp(AbstractToken tok, Expr oper)

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

Field Detail

op

public final AbstractToken op

operand

public final Expr operand

Constructor Detail

Expr.UnOp

public Expr.UnOp(AbstractToken tok,
                 Expr oper)

Method Detail

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 program

c - 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()