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de.dante.extex.interpreter.primitives.math.fraction
Class Atop

java.lang.Object
  extended byde.dante.extex.interpreter.type.AbstractCode
      extended byde.dante.extex.interpreter.primitives.math.AbstractMathCode
          extended byde.dante.extex.interpreter.primitives.math.fraction.Atop
All Implemented Interfaces:
Code, Localizable, java.io.Serializable
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: 1.11 $
Author:
Gerd Neugebauer
See Also:
Serialized Form

Field Summary
protected static long serialVersionUID
          The constant serialVersionUID contains the id for serialization.
 
Constructor Summary
Atop(java.lang.String name)
          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 de.dante.extex.interpreter.primitives.math.AbstractMathCode
getListMaker
 
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

Atop

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

Parameters:
name - the name for tracing and debugging
Method Detail

execute

public void execute(Flags prefix,
                    Context context,
                    TokenSource source,
                    Typesetter typesetter)
             throws InterpreterException
Description copied from interface: Code
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
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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