org.apache.sling.scripting.sightly.impl.compiler.optimization

Class DeadCodeRemoval

java.lang.Object

org.apache.sling.scripting.sightly.impl.compiler.visitor.UniformVisitor

org.apache.sling.scripting.sightly.impl.compiler.visitor.TrackingVisitor<Boolean>

org.apache.sling.scripting.sightly.impl.compiler.optimization.DeadCodeRemoval

All Implemented Interfaces:

CommandVisitor, EmitterVisitor

public class DeadCodeRemoval
extends TrackingVisitor<Boolean>
implements EmitterVisitor

Removes code under conditionals which are proven to fail. It is probably a good idea to run this optimization after running ConstantFolding

Field Summary

Fields inherited from class org.apache.sling.scripting.sightly.impl.compiler.visitor.TrackingVisitor

tracker

Constructor Summary

Constructors

Constructor and Description
DeadCodeRemoval(StatefulVisitor.StateControl stateControl)

Method Summary

Modifier and Type	Method and Description
protected Boolean	assignDefault(Command command)
PushStream	getOutputStream() Get the output stream
protected void	onCommand(Command command)
static StreamTransformer	transformer()
void	visit(Conditional.End conditionalEnd) Process a Conditional.End command.
void	visit(Conditional.Start conditionalStart) Process a Conditional.Start command.
void	visit(VariableBinding.Start variableBindingStart) Process a VariableBinding.Start command.

Methods inherited from class org.apache.sling.scripting.sightly.impl.compiler.visitor.TrackingVisitor

visit, visit, visit

Methods inherited from class org.apache.sling.scripting.sightly.impl.compiler.visitor.UniformVisitor

visit, visit, visit, visit, visit, visit

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.sling.scripting.sightly.compiler.commands.CommandVisitor

visit, visit, visit, visit, visit, visit, visit, visit, visit

Constructor Detail

DeadCodeRemoval

public DeadCodeRemoval(StatefulVisitor.StateControl stateControl)

Method Detail

transformer

public static StreamTransformer transformer()

visit

public void visit(VariableBinding.Start variableBindingStart)

Description copied from interface: CommandVisitor

Process a VariableBinding.Start command.

Specified by:

visit in interface CommandVisitor

Overrides:

visit in class TrackingVisitor<Boolean>

Parameters:

variableBindingStart - the command

visit

public void visit(Conditional.Start conditionalStart)

Description copied from interface: CommandVisitor

Process a Conditional.Start command.

Specified by:

visit in interface CommandVisitor

Overrides:

visit in class UniformVisitor

Parameters:

conditionalStart - the command

visit

public void visit(Conditional.End conditionalEnd)

Description copied from interface: CommandVisitor

Process a Conditional.End command.

Specified by:

visit in interface CommandVisitor

Overrides:

visit in class UniformVisitor

Parameters:

conditionalEnd - the command

getOutputStream

public PushStream getOutputStream()

Description copied from interface: EmitterVisitor

Get the output stream

Specified by:

getOutputStream in interface EmitterVisitor

Returns:

the output stream of this visitor

assignDefault

protected Boolean assignDefault(Command command)

Specified by:

assignDefault in class TrackingVisitor<Boolean>

onCommand

protected void onCommand(Command command)

Specified by:

onCommand in class UniformVisitor