avrora.syntax
Class Expr.BinOp

java.lang.Object
  avrora.syntax.ASTNode
      avrora.syntax.Expr
          avrora.syntax.Expr.BinOp

Enclosing class:

Expr

public static class Expr.BinOp

extends Expr

The BinOp class represents a simple binary arithmetic operator such as addition, multiplication, etc. It contains two internal expressions, the left and right.

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

Expr	left The left field records an expression that represents the operand on the left side of the operator.
AbstractToken	op The op field records the token that corresponds to the actual arithmetic operator.
Expr	right The right field records an expression that represents the operand on the right side of the operator.

Constructor Summary

Expr.BinOp(AbstractToken tok, Expr l, Expr r)

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

The op field records the token that corresponds to the actual arithmetic operator.

left

public final Expr left

The left field records an expression that represents the operand on the left side of the operator.

right

public final Expr right

The right field records an expression that represents the operand on the right side of the operator.

Constructor Detail

Expr.BinOp

public Expr.BinOp(AbstractToken tok,
                  Expr l,
                  Expr r)

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 left operand, then the right, 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()