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

java.lang.Object
  edu.stanford.nlp.trees.AbstractTreebankLanguagePack
      edu.stanford.nlp.trees.international.negra.NegraPennLanguagePack

All Implemented Interfaces:

TreebankLanguagePack, java.io.Serializable

public class NegraPennLanguagePack
extends AbstractTreebankLanguagePack

Language pack for Negra and Tiger treebanks after conversion to PTB format.

Author:

Roger Levy, Spence Green

See Also:

Serialized Form

Field Summary

Fields inherited from class edu.stanford.nlp.trees.AbstractTreebankLanguagePack

DEFAULT_ENCODING, DEFAULT_GF_CHAR, gfCharacter

Constructor Summary

NegraPennLanguagePack()
Gives a handle to the TreebankLanguagePack

NegraPennLanguagePack(boolean leaveGF, char gfChar)
Make a new language pack with grammatical functions used based on the value of leaveGF and marked with the character gfChar.

Method Summary

java.lang.String	basicCategory(java.lang.String category) Returns the basic syntactic category of a String.
java.lang.String[]	evalBIgnoredPunctuationTags() Returns a String array of punctuation tags that EVALB-style evaluation should ignore for this treebank/language.
java.lang.String	getEncoding() Return the input Charset encoding for the Treebank.
TokenizerFactory<Word>	getTokenizerFactory() Return a tokenizer which might be suitable for tokenizing text that will be used with this Treebank/Language pair, without tokenizing carriage returns (i.e., treating them as white space).
HeadFinder	headFinder() The HeadFinder to use for your treebank.
boolean	isLeaveGF()
char[]	labelAnnotationIntroducingCharacters() Return an array of characters at which a String should be truncated to give the basic syntactic category of a label.
java.lang.String[]	punctuationTags() Returns a String array of punctuation tags for this treebank/language.
java.lang.String[]	punctuationWords() Returns a String array of punctuation words for this treebank/language.
java.lang.String[]	sentenceFinalPunctuationTags() Returns a String array of sentence final punctuation tags for this treebank/language.
java.lang.String[]	sentenceFinalPunctuationWords() Returns a String array of sentence final punctuation words for this treebank/language.
void	setLeaveGF(boolean leaveGF)
java.lang.String[]	startSymbols() Returns a String array of treebank start symbols.
java.lang.String	stripGF(java.lang.String category) Returns the category for a String with everything following the gf character (which may be language specific) stripped.
java.lang.String	treebankFileExtension() Returns the extension of treebank files for this treebank.
TreeReaderFactory	treeReaderFactory() Returns a TreeReaderFactory suitable for general purpose use with this language/treebank.
HeadFinder	typedDependencyHeadFinder() The HeadFinder to use when making typed dependencies.

Methods inherited from class edu.stanford.nlp.trees.AbstractTreebankLanguagePack

categoryAndFunction, evalBIgnoredPunctuationTagAcceptFilter, evalBIgnoredPunctuationTagRejectFilter, getBasicCategoryFunction, getCategoryAndFunctionFunction, getGfCharacter, grammaticalStructureFactory, grammaticalStructureFactory, grammaticalStructureFactory, isEvalBIgnoredPunctuationTag, isLabelAnnotationIntroducingCharacter, isPunctuationTag, isPunctuationWord, isSentenceFinalPunctuationTag, isStartSymbol, morphFeatureSpec, punctuationTagAcceptFilter, punctuationTagRejectFilter, punctuationWordAcceptFilter, punctuationWordRejectFilter, sentenceFinalPunctuationTagAcceptFilter, setGfCharacter, startSymbol, startSymbolAcceptFilter, treeTokenizerFactory

Methods inherited from class java.lang.Object

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

Constructor Detail

NegraPennLanguagePack

public NegraPennLanguagePack()

Gives a handle to the TreebankLanguagePack

NegraPennLanguagePack

public NegraPennLanguagePack(boolean leaveGF,
                             char gfChar)

Make a new language pack with grammatical functions used based on the value of leaveGF and marked with the character gfChar. gfChar should *not* be an annotation introducing character.

Method Detail

punctuationTags

public java.lang.String[] punctuationTags()

Returns a String array of punctuation tags for this treebank/language.

Specified by:

punctuationTags in interface TreebankLanguagePack

Specified by:

punctuationTags in class AbstractTreebankLanguagePack

Returns:

The punctuation tags

punctuationWords

public java.lang.String[] punctuationWords()

Returns a String array of punctuation words for this treebank/language.

Specified by:

punctuationWords in interface TreebankLanguagePack

Specified by:

punctuationWords in class AbstractTreebankLanguagePack

Returns:

The punctuation words

sentenceFinalPunctuationTags

public java.lang.String[] sentenceFinalPunctuationTags()

Returns a String array of sentence final punctuation tags for this treebank/language.

Specified by:

sentenceFinalPunctuationTags in interface TreebankLanguagePack

Specified by:

sentenceFinalPunctuationTags in class AbstractTreebankLanguagePack

Returns:

The sentence final punctuation tags

sentenceFinalPunctuationWords

public java.lang.String[] sentenceFinalPunctuationWords()

Returns a String array of sentence final punctuation words for this treebank/language.

Returns:

The sentence final punctuation tags

basicCategory

public java.lang.String basicCategory(java.lang.String category)

Description copied from class: AbstractTreebankLanguagePack

Returns the basic syntactic category of a String. This implementation basically truncates stuff after an occurrence of one of the labelAnnotationIntroducingCharacters(). However, there is also special case stuff to deal with labelAnnotationIntroducingCharacters in category labels: (i) if the first char is in this set, it's never truncated (e.g., '-' or '=' as a token), and (ii) if it starts with one of this set, a second instance of the same item from this set is also excluded (to deal with '-LLB-', '-RCB-', etc.).

Specified by:

basicCategory in interface TreebankLanguagePack

Overrides:

basicCategory in class AbstractTreebankLanguagePack

Parameters:

category - The whole String name of the label

Returns:

The basic category of the String

stripGF

public java.lang.String stripGF(java.lang.String category)

Description copied from interface: TreebankLanguagePack

Returns the category for a String with everything following the gf character (which may be language specific) stripped.

Specified by:

stripGF in interface TreebankLanguagePack

Overrides:

stripGF in class AbstractTreebankLanguagePack

Parameters:

category - The String name of the label (may previously have had basic category called on it)

Returns:

The String stripped of grammatical functions

evalBIgnoredPunctuationTags

public java.lang.String[] evalBIgnoredPunctuationTags()

Returns a String array of punctuation tags that EVALB-style evaluation should ignore for this treebank/language. Traditionally, EVALB has ignored a subset of the total set of punctuation tags in the English Penn Treebank (quotes and period, comma, colon, etc., but not brackets)

Specified by:

evalBIgnoredPunctuationTags in interface TreebankLanguagePack

Overrides:

evalBIgnoredPunctuationTags in class AbstractTreebankLanguagePack

Returns:

Whether this is a EVALB-ignored punctuation tag

labelAnnotationIntroducingCharacters

public char[] labelAnnotationIntroducingCharacters()

Return an array of characters at which a String should be truncated to give the basic syntactic category of a label. The idea here is that Penn treebank style labels follow a syntactic category with various functional and crossreferencing information introduced by special characters (such as "NP-SBJ=1"). This would be truncated to "NP" by the array containing '-' and "=".

Specified by:

labelAnnotationIntroducingCharacters in interface TreebankLanguagePack

Overrides:

labelAnnotationIntroducingCharacters in class AbstractTreebankLanguagePack

Returns:

An array of characters that set off label name suffixes

startSymbols

public java.lang.String[] startSymbols()

Returns a String array of treebank start symbols.

Specified by:

startSymbols in interface TreebankLanguagePack

Specified by:

startSymbols in class AbstractTreebankLanguagePack

Returns:

The start symbols

getEncoding

public java.lang.String getEncoding()

Return the input Charset encoding for the Treebank. See documentation for the Charset class.

Specified by:

getEncoding in interface TreebankLanguagePack

Overrides:

getEncoding in class AbstractTreebankLanguagePack

Returns:

Name of Charset

treebankFileExtension

public java.lang.String treebankFileExtension()

Returns the extension of treebank files for this treebank. This is "mrg".

Returns:

the extension on files for this treebank

isLeaveGF

public boolean isLeaveGF()

setLeaveGF

public void setLeaveGF(boolean leaveGF)

treeReaderFactory

public TreeReaderFactory treeReaderFactory()

Description copied from class: AbstractTreebankLanguagePack

Returns a TreeReaderFactory suitable for general purpose use with this language/treebank.

Specified by:

treeReaderFactory in interface TreebankLanguagePack

Overrides:

treeReaderFactory in class AbstractTreebankLanguagePack

Returns:

A TreeReaderFactory suitable for general purpose use with this language/treebank.

headFinder

public HeadFinder headFinder()

The HeadFinder to use for your treebank.

Returns:

A suitable HeadFinder

typedDependencyHeadFinder

public HeadFinder typedDependencyHeadFinder()

The HeadFinder to use when making typed dependencies.

Returns:

A suitable HeadFinder

getTokenizerFactory

public TokenizerFactory<Word> getTokenizerFactory()

Return a tokenizer which might be suitable for tokenizing text that will be used with this Treebank/Language pair, without tokenizing carriage returns (i.e., treating them as white space). For German (Negra) we used to only provide a WhitespaceTokenizer, but people didn't much like that. So now we provide PTBTokenizer. It's not customized to German, but will nevertheless do better than WhitespaceTokenizer at tokenizing German!

Specified by:

getTokenizerFactory in interface TreebankLanguagePack

Overrides:

getTokenizerFactory in class AbstractTreebankLanguagePack

Returns:

A tokenizer