org.serversass.ast

Class Operation

java.lang.Object

org.serversass.ast.Operation

All Implemented Interfaces:

Expression

public class Operation
extends Object
implements Expression

Represents a binary operation.

Constructor Summary

Constructors

Constructor and Description
Operation(String operation, Expression left, Expression right) Creates a new operation, with the given operator and the left and right expression.

Method Summary

Modifier and Type	Method and Description
Expression	eval(Scope scope, Generator gen) If possible the expression is evaluated and a simplified expression is returned.
protected double	evalOperation(Generator gen, double lVal, double rVal)
Expression	getLeft() Returns the left side of the operation.
String	getOperation() Returns the operator of this operation.
Expression	getRight() Returns the right side of the operation.
boolean	isConstant() Determines if this expression is constant or if it depends on variables.
boolean	isProtect() Determines if the operation is guarded by braces and most not be re-ordered by operator precedence.
void	protect() Marks that this expression is guarded by braces so that operator precedence does not matter.
void	setRight(Expression right) Sets the right side of the operation.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Operation

public Operation(String operation,
                 Expression left,
                 Expression right)

Creates a new operation, with the given operator and the left and right expression.

Parameters:

operation - the operation to use

left - the expression on the left side

right - the expression on the right side

Method Detail

protect

public void protect()

Marks that this expression is guarded by braces so that operator precedence does not matter.

getOperation

public String getOperation()

Returns the operator of this operation.

Returns:

the operator as string

isProtect

public boolean isProtect()

Determines if the operation is guarded by braces and most not be re-ordered by operator precedence.

Returns:

true if the operation is surrounded by braces, false otherwise

getLeft

public Expression getLeft()

Returns the left side of the operation.

Returns:

the left side of the operation

getRight

public Expression getRight()

Returns the right side of the operation.

Returns:

the right side of the operation

setRight

public void setRight(Expression right)

Sets the right side of the operation.

Parameters:

right - the new right side of the operation

toString

public String toString()

Overrides:

toString in class Object

isConstant

public boolean isConstant()

Description copied from interface: Expression

Determines if this expression is constant or if it depends on variables.

Specified by:

isConstant in interface Expression

Returns:

true if the expression is constant, false otherwise

eval

public Expression eval(Scope scope,
                       Generator gen)

Description copied from interface: Expression

If possible the expression is evaluated and a simplified expression is returned.

Specified by:

eval in interface Expression

Parameters:

scope - the scope used to resolve variables.

gen - the generator used to evaluate functions

Returns:

a possibly simplified version of the expression

evalOperation

protected double evalOperation(Generator gen,
                               double lVal,
                               double rVal)