org.extex.unit.tex.math.fraction
Class Atop

java.lang.Object
  org.extex.interpreter.type.AbstractCode
      org.extex.unit.tex.math.AbstractMathCode
          org.extex.unit.tex.math.fraction.Atop

All Implemented Interfaces:

java.io.Serializable, Code

public class Atop
extends AbstractMathCode

This class provides an implementation for the primitive \atop.

The Math Primitive \atop

The math primitive \atop arranges that the material in the math group before it is typeset above the material after the primitive. The two parts are not separated by a line.

If several primitives of type \above, \abovewithdelims, \atop, \atopwithdelims, \over, or \overwithdelims are encountered in the same math group then the result is ambiguous and an error is raised.

If the primitive is used outside of math mode then an error is raised.

Syntax

The formal description of this primitive is the following:

    ⟨atop⟩
       → ⟨math material⟩ \atop ⟨math material⟩  

Examples

    { a \atop b}  

Version:

$Revision: 4732 $

Author:

Gerd Neugebauer

See Also:

Serialized Form

Field Summary

protected static long

serialVersionUID The constant serialVersionUID contains the id for serialization.

Constructor Summary

Atop(CodeToken token)
Creates a new object.

Method Summary

void	execute(Flags prefix, Context context, TokenSource source, Typesetter typesetter) This method takes the first token and executes it.

Methods inherited from class org.extex.unit.tex.math.AbstractMathCode

getListMaker

Methods inherited from class org.extex.interpreter.type.AbstractCode

getLocalizer, getName, getToken, isIf, isOuter, readResolve, toString, toText, toText

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

Atop

public Atop(CodeToken token)

Creates a new object.

Parameters:

token - the initial token for the primitive

Method Detail

execute

public void execute(Flags prefix,
                    Context context,
                    TokenSource source,
                    Typesetter typesetter)
             throws HelpingException,
                    ConfigurationException,
                    TypesetterException

This method takes the first token and executes it. The result is placed on the stack. This operation might have side effects. To execute a token it might be necessary to consume further tokens.

Specified by:

execute in interface Code

Overrides:

execute in class AbstractCode

Parameters:

prefix - the prefix controlling the execution

context - the interpreter context

source - the token source

typesetter - the typesetter

Throws:

HelpingException - in case of an error

ConfigurationException - in case of an configuration error

TypesetterException - in case of an error in the typesetter

See Also:

AbstractCode.execute( org.extex.interpreter.Flags, org.extex.interpreter.context.Context, org.extex.interpreter.TokenSource, org.extex.typesetter.Typesetter)