org.extex.unit.tex.typesetter.spacing
Class Hskip

java.lang.Object
  extended by org.extex.interpreter.type.AbstractCode
      extended by org.extex.unit.tex.typesetter.AbstractHorizontalCode
          extended by org.extex.unit.tex.typesetter.spacing.Hskip
All Implemented Interfaces:
java.io.Serializable, Code, HorizontalSkip

public class Hskip
extends AbstractHorizontalCode
implements HorizontalSkip

This class provides an implementation for the primitive \hskip.

The Primitive \hskip

The primitive \hskip inserts the given amount of glue into the typesetter. If the typesetter is not in a horizontal mode then it is switched to horizontal mode first.

Syntax

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

Examples

    \hskip 1em plus 1pt minus 1pt  

Version:
$Revision:4431 $
Author:
Gerd Neugebauer
See Also:
Serialized Form

Field Summary
protected static long serialVersionUID
          The constant serialVersionUID contains the id for serialization.
 
Constructor Summary
Hskip(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.
 FixedGlue getGlue(Context context, TokenSource source, Typesetter typesetter)
          This method acquires a vertical glue.
 
Methods inherited from class org.extex.unit.tex.typesetter.AbstractHorizontalCode
ensureHorizontalMode, switchToHorizontalMode
 
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

Hskip

public Hskip(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,
                    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
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)

getGlue

public FixedGlue getGlue(Context context,
                         TokenSource source,
                         Typesetter typesetter)
                  throws HelpingException,
                         TypesetterException
This method acquires a vertical glue.

Specified by:
getGlue in interface HorizontalSkip
Parameters:
context - the interpreter context
source - the source for new tokens
typesetter - the typesetter
Returns:
the amount of vertical skip
Throws:
HelpingException - in case of an error
TypesetterException - in case of an error in the typesetter
See Also:
HorizontalSkip.getGlue( org.extex.interpreter.context.Context, org.extex.interpreter.TokenSource, org.extex.typesetter.Typesetter)