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de.dante.extex.interpreter.primitives.conditional
Class Else

java.lang.Object
  extended byde.dante.extex.interpreter.type.AbstractCode
      extended byde.dante.extex.interpreter.primitives.conditional.Else
All Implemented Interfaces:
Code, Localizable, java.io.Serializable
public class Else
extends AbstractCode

This class provides an implementation for the primitive \else.

The Primitive \else

The primitive \else can appear in the context of a conditional. It terminates the preceding branch and starts the next one.

The primitive \else can not be used alone. It always comes in conjunction with a conditional. A isolated \else leads immediately to an error.

Syntax

The formal description of this primitive is the following: 
    ⟨else⟩
      → \else

Examples

    \ifnum 1<2\else no\fi
Note:
This primitive is not expandable!

Version:
$Revision: 1.26 $
Author:
Gerd Neugebauer
See Also:
Serialized Form

Field Summary
protected static long serialVersionUID
          The constant serialVersionUID contains the id for serialization.
 
Constructor Summary
Else(java.lang.String name)
          Creates a new object.
 
Method Summary
 void execute(Flags prefix, Context context, TokenSource source, Typesetter typesetter)
          Executes the primitive.
 
Methods inherited from class de.dante.extex.interpreter.type.AbstractCode
enableLocalization, getLocalizer, getName, isIf, isOuter, printable, printableControlSequence, readResolve, setName, toString
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

serialVersionUID

protected static final long serialVersionUID
The constant serialVersionUID contains the id for serialization.

See Also:
Constant Field Values
Constructor Detail

Else

public Else(java.lang.String name)
Creates a new object.

Parameters:
name - the name for debugging
Method Detail

execute

public void execute(Flags prefix,
                    Context context,
                    TokenSource source,
                    Typesetter typesetter)
             throws InterpreterException
Executes the primitive.

This primitive can only be seen when a conditional has been opened before for which the then branch is expanded. Thus the else branch has to be skipped. Additionally the conditional stack has to be updated. If the conditional stack is already empty then an exception is raised.

Specified by:
execute in interface Code
Overrides:
execute in class AbstractCode
Throws:
InterpreterException
See Also:
Code.execute( de.dante.extex.interpreter.Flags, de.dante.extex.interpreter.context.Context, de.dante.extex.interpreter.TokenSource, de.dante.extex.typesetter.Typesetter)
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