Package org.jfuncmachine.compiler.model.expr.bool

Class BooleanExpr

java.lang.Object

org.jfuncmachine.compiler.model.SourceElement

org.jfuncmachine.compiler.model.expr.bool.BooleanExpr

Direct Known Subclasses:

And, BinaryComparison, BoolFalse, BoolTrue, InstanceofComparison, Not, Or, Result, UnaryComparison

public abstract class BooleanExpr
extends SourceElement

An abstract class for different types of boolean expressions

Field Summary

Fields

Modifier and Type	Field	Description
Label	label	The label associated with this expression (may be null)

Fields inherited from class org.jfuncmachine.compiler.model.SourceElement

filename, lineNumber

Constructor Summary

Constructors

Constructor	Description
BooleanExpr(String filename, int lineNumber)	Create a new BooleanExpr associated with a particular source filename and line number

Method Summary

Modifier and Type	Method	Description
abstract BooleanExpr	computeSequence(BooleanExpr trueNext, BooleanExpr falseNext, List<BooleanExpr> tests)	Compute a sequence of tests to determine if this expression is true or false
abstract BooleanExpr	invert()	Invert this expression, which may involve reversing comparisons or changing and to or with inverted tests, etc.
abstract BooleanExpr	removeNot()	Remove any not expressions from a tree of boolean expressions by inverting the expression under the not
void	reset()	Resets any values modified during code generation

Methods inherited from class org.jfuncmachine.compiler.model.SourceElement

generateException

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

label

public Label label

The label associated with this expression (may be null)

Constructor Details

BooleanExpr

public BooleanExpr(String filename,
 int lineNumber)

Create a new BooleanExpr associated with a particular source filename and line number

Parameters:

filename - The source filename this expression is associated with

lineNumber - The source line number this expression is associated with

Method Details

invert

public abstract BooleanExpr invert()

Invert this expression, which may involve reversing comparisons or changing and to or with inverted tests, etc.

Returns:

An inverted boolean expression

reset

public void reset()

Resets any values modified during code generation

removeNot

public abstract BooleanExpr removeNot()

Remove any not expressions from a tree of boolean expressions by inverting the expression under the not

Returns:

a BooleanExpr with any nested Not constructions removed

computeSequence

public abstract BooleanExpr computeSequence(BooleanExpr trueNext,
 BooleanExpr falseNext,
 List<BooleanExpr> tests)

Compute a sequence of tests to determine if this expression is true or false

Parameters:

trueNext - The next expression to evaluate if this expression is true

falseNext - The next expression to evaluate if this expression is false

tests - An accumulator for the tests to be executed

Returns:

The beginning of the sequence