edu.stanford.nlp.trees.international.negra
Class NegraPennTreeNormalizer

java.lang.Object
  edu.stanford.nlp.trees.TreeNormalizer
      edu.stanford.nlp.trees.international.negra.NegraPennTreeNormalizer

All Implemented Interfaces:

Serializable

public class NegraPennTreeNormalizer
extends TreeNormalizer

Tree normalizer for Negra Penn Treebank format.

Author:

Roger Levy

See Also:

Serialized Form

Field Summary

protected TreebankLanguagePack

tlp

Constructor Summary

NegraPennTreeNormalizer()

NegraPennTreeNormalizer(TreebankLanguagePack tlp)

Method Summary

protected String	cleanUpLabel(String label) Remove things like hyphened functional tags and equals from the end of a node label.
boolean	getInsertNPinPP()
boolean	getLeaveGF()
String	nonUnaryRootSymbol()
String	normalizeNonterminal(String category) Normalizes a nonterminal contents.
String	normalizeTerminal(String leaf) Normalizes a leaf contents.
Tree	normalizeWholeTree(Tree tree, TreeFactory tf) Normalize a whole tree -- one can assume that this is the root.
String	rootSymbol()
void	setInsertNPinPP(boolean b)
void	setLeaveGF(boolean b)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

tlp

protected final TreebankLanguagePack tlp

Constructor Detail

NegraPennTreeNormalizer

public NegraPennTreeNormalizer()

NegraPennTreeNormalizer

public NegraPennTreeNormalizer(TreebankLanguagePack tlp)

Method Detail

rootSymbol

public String rootSymbol()

nonUnaryRootSymbol

public String nonUnaryRootSymbol()

setLeaveGF

public void setLeaveGF(boolean b)

getLeaveGF

public boolean getLeaveGF()

setInsertNPinPP

public void setInsertNPinPP(boolean b)

getInsertNPinPP

public boolean getInsertNPinPP()

normalizeTerminal

public String normalizeTerminal(String leaf)

Normalizes a leaf contents. This implementation interns the leaf.

Overrides:

normalizeTerminal in class TreeNormalizer

Parameters:

leaf - The String that decorates the leaf

Returns:

The normalized form of this leaf String

normalizeNonterminal

public String normalizeNonterminal(String category)

Normalizes a nonterminal contents. This implementation strips functional tags, etc. and interns the nonterminal.

Overrides:

normalizeNonterminal in class TreeNormalizer

Parameters:

category - The String that decorates this nonterminal node

Returns:

The normalized form of this nonterminal String

normalizeWholeTree

public Tree normalizeWholeTree(Tree tree,
                               TreeFactory tf)

Normalize a whole tree -- one can assume that this is the root. This implementation deletes empty elements (ones with nonterminal tag label starting with '*T') from the tree. It does work for a null tree.

The NegraPennTreeNormalizer also changes the Label to a NegraLabel and notes the functional marking as part of the NegraLabel.

Overrides:

normalizeWholeTree in class TreeNormalizer

Parameters:

tree - The tree to be normalized

tf - the TreeFactory to create new nodes (if needed)

Returns:

Tree the normalized tree

cleanUpLabel

protected String cleanUpLabel(String label)

Remove things like hyphened functional tags and equals from the end of a node label.