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

java.lang.Object
  de.dante.extex.interpreter.type.AbstractCode
      de.dante.extex.interpreter.primitives.conditional.AbstractIf
          de.dante.extex.interpreter.primitives.conditional.Ifvbox

All Implemented Interfaces:

Code, ExpandableCode, Localizable, java.io.Serializable

public class Ifvbox

extends AbstractIf

This class provides an implementation for the primitive \ifvbox.

The Primitive \ifvbox

The primitive takes one expanded integer argument. The conditional is true iff the box denoted by the argument is a vertical box.

Syntax

    ⟨ifvbox⟩
      → \ifvbox ⟨number⟩ ⟨true text⟩ \fi
      | \ifvbox ⟨number⟩ ⟨true text⟩ \else ⟨false text⟩ \fi 

Examples

    \ifvbox255 abc \fi  

    \ifvbox\count120 abc \fi  

Version:

$Revision: 1.20 $

Author:

Gerd Neugebauer

See Also:

Serialized Form

serialVersionUID

protected static final long serialVersionUID

The constant serialVersionUID contains the id for serialization.

See Also:

Constant Field Values

Ifvbox

public Ifvbox(java.lang.String name)

Creates a new object.

Parameters:

name - the name for debugging

conditional

protected boolean conditional(Context context,
                              TokenSource source,
                              Typesetter typesetter)
                       throws InterpreterException

Description copied from class: AbstractIf

This method computes the boolean value of the conditional. If the result is true then the then branch is expanded and the else branch is skipped. Otherwise the then branch is skipped and the else branch is expanded.

Specified by:

conditional in class AbstractIf

Parameters:

context - the interpreter context

source - the source for new tokens

typesetter - the typesetter

Returns:

the boolean value

Throws:

InterpreterException - in case of en error

See Also:

AbstractIf.conditional( de.dante.extex.interpreter.context.Context, de.dante.extex.interpreter.TokenSource, de.dante.extex.typesetter.Typesetter)