package edu.stanford.nlp.trees;
import edu.stanford.nlp.process.TokenizerFactory;
import java.util.function.Function;
import java.util.function.Predicate;
import edu.stanford.nlp.international.morph.MorphoFeatureSpecification;
import edu.stanford.nlp.ling.HasWord;
import java.io.Serializable;
/**
* This interface specifies language/treebank specific information for a
* Treebank, which a parser or other treebank user might need to know.
*
* Some of this is fixed for a (treebank,language) pair, but some of it
* reflects feature extraction decisions, so it can be sensible to have
* multiple implementations of this interface for the same
* (treebank,language) pair.
*
* So far this covers punctuation, character encodings, and characters
* reserved for label annotations. It should probably be expanded to
* cover other stuff (unknown words?).
*
* Various methods in this class return arrays. You should treat them
* as read-only, even though one cannot enforce that in Java.
*
* Implementations in this class do not call basicCategory() on arguments
* before testing them, so if needed, you should explicitly call
* basicCategory() yourself before passing arguments to these routines for
* testing.
*
* This class should be able to be an immutable singleton. It contains
* data on various things, but no state. At some point we should make it
* a real immutable singleton.
*
* @author Christopher Manning
* @version 1.1, Mar 2003
*/
public interface TreebankLanguagePack extends Serializable {
/**
* Use this as the default encoding for Readers and Writers of
* Treebank data.
*/
String DEFAULT_ENCODING = "UTF-8";
/**
* Accepts a String that is a punctuation
* tag name, and rejects everything else.
*
* @param str The string to check
* @return Whether this is a punctuation tag
*/
boolean isPunctuationTag(String str);
/**
* Accepts a String that is a punctuation
* word, and rejects everything else.
* If one can't tell for sure (as for ' in the Penn Treebank), it
* maks the best guess that it can.
*
* @param str The string to check
* @return Whether this is a punctuation word
*/
boolean isPunctuationWord(String str);
/**
* Accepts a String that is a sentence end
* punctuation tag, and rejects everything else.
*
* @param str The string to check
* @return Whether this is a sentence final punctuation tag
*/
boolean isSentenceFinalPunctuationTag(String str);
/**
* Accepts a String that is a punctuation
* tag that should be ignored by EVALB-style evaluation,
* and rejects everything else.
* 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)
*
* @param str The string to check
* @return Whether this is a EVALB-ignored punctuation tag
*/
boolean isEvalBIgnoredPunctuationTag(String str);
/**
* Return a filter that accepts a String that is a punctuation
* tag name, and rejects everything else.
*
* @return The filter
*/
Predicate<String> punctuationTagAcceptFilter();
/**
* Return a filter that rejects a String that is a punctuation
* tag name, and accepts everything else.
*
* @return The filter
*/
Predicate<String> punctuationTagRejectFilter();
/**
* Returns a filter that accepts a String that is a punctuation
* word, and rejects everything else.
* If one can't tell for sure (as for ' in the Penn Treebank), it
* maks the best guess that it can.
*
* @return The Filter
*/
Predicate<String> punctuationWordAcceptFilter();
/**
* Returns a filter that accepts a String that is not a punctuation
* word, and rejects punctuation.
* If one can't tell for sure (as for ' in the Penn Treebank), it
* makes the best guess that it can.
*
* @return The Filter
*/
Predicate<String> punctuationWordRejectFilter();
/**
* Returns a filter that accepts a String that is a sentence end
* punctuation tag, and rejects everything else.
*
* @return The Filter
*/
Predicate<String> sentenceFinalPunctuationTagAcceptFilter();
/**
* Returns a filter that accepts a String that is a punctuation
* tag that should be ignored by EVALB-style evaluation,
* and rejects everything else.
* 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)
*
* @return The Filter
*/
Predicate<String> evalBIgnoredPunctuationTagAcceptFilter();
/**
* Returns a filter that accepts everything except a String that is a
* punctuation tag that should be ignored by EVALB-style evaluation.
* 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)
*
* @return The Filter
*/
Predicate<String> evalBIgnoredPunctuationTagRejectFilter();
/**
* Returns a String array of punctuation tags for this treebank/language.
*
* @return The punctuation tags
*/
String[] punctuationTags();
/**
* Returns a String array of punctuation words for this treebank/language.
*
* @return The punctuation words
*/
String[] punctuationWords();
/**
* Returns a String array of sentence final punctuation tags for this
* treebank/language. The first in the list is assumed to be the most
* basic one.
*
* @return The sentence final punctuation tags
*/
String[] sentenceFinalPunctuationTags();
/**
* Returns a String array of sentence final punctuation words for
* this treebank/language.
*
* @return The punctuation words
*/
String[] sentenceFinalPunctuationWords();
/**
* 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)
*
* @return Whether this is a EVALB-ignored punctuation tag
*/
String[] evalBIgnoredPunctuationTags();
/**
* Return a GrammaticalStructureFactory suitable for this language/treebank.
*
* @return A GrammaticalStructureFactory suitable for this language/treebank
*/
GrammaticalStructureFactory grammaticalStructureFactory();
/**
* Return a GrammaticalStructureFactory suitable for this language/treebank.
*
* @param puncFilter A filter which should reject punctuation words (as Strings)
* @return A GrammaticalStructureFactory suitable for this language/treebank
*/
GrammaticalStructureFactory grammaticalStructureFactory(Predicate<String> puncFilter);
/**
* Return a GrammaticalStructureFactory suitable for this language/treebank.
*
* @param puncFilter A filter which should reject punctuation words (as Strings)
* @param typedDependencyHF A HeadFinder which finds heads for typed dependencies
* @return A GrammaticalStructureFactory suitable for this language/treebank
*/
GrammaticalStructureFactory grammaticalStructureFactory(Predicate<String> puncFilter, HeadFinder typedDependencyHF);
/**
* Whether or not we have typed dependencies for this language. If
* this method returns false, a call to grammaticalStructureFactory
* will cause an exception.
*/
boolean supportsGrammaticalStructures();
/**
* Return the charset encoding of the Treebank. See
* documentation for the <code>Charset</code> class.
*
* @return Name of Charset
*/
String getEncoding();
/**
* Return a tokenizer factory which might be suitable for tokenizing text
* that will be used with this Treebank/Language pair. This is for
* real text of this language pair, not for reading stuff inside the
* treebank files.
*
* @return A tokenizer
*/
TokenizerFactory<? extends HasWord> getTokenizerFactory();
/**
* 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 "=". <br>
* Note that these are never deleted as the first character as a label
* (so they are okay as one character tags, etc.), but only when
* subsequent characters.
*
* @return An array of characters that set off label name suffixes
*/
char[] labelAnnotationIntroducingCharacters();
/**
* Say whether this character is an annotation introducing
* character.
*
* @param ch A char
* @return Whether this char introduces functional annotations
*/
boolean isLabelAnnotationIntroducingCharacter(char ch);
/**
* Returns the basic syntactic category of a String by truncating
* stuff after a (non-word-initial) occurrence of one of the
* <code>labelAnnotationIntroducingCharacters()</code>. This
* function should work on phrasal category and POS tag labels,
* but needn't (and couldn't be expected to) work on arbitrary
* Word strings.
*
* @param category The whole String name of the label
* @return The basic category of the String
*/
String basicCategory(String category);
/**
* Returns the category for a String with everything following
* the gf character (which may be language specific) stripped.
*
* @param category The String name of the label (may previously have had basic category called on it)
* @return The String stripped of grammatical functions
*/
String stripGF(String category);
/**
* Returns a {@link Function Function} object that maps Strings to Strings according
* to this TreebankLanguagePack's basicCategory method.
*
* @return the String->String Function object
*/
Function<String,String> getBasicCategoryFunction();
/**
* Returns the syntactic category and 'function' of a String.
* This normally involves truncating numerical coindexation
* showing coreference, etc. By 'function', this means
* keeping, say, Penn Treebank functional tags or ICE phrasal functions,
* perhaps returning them as <code>category-function</code>.
*
* @param category The whole String name of the label
* @return A String giving the category and function
*/
String categoryAndFunction(String category);
/**
* Returns a {@link Function Function} object that maps Strings to Strings according
* to this TreebankLanguagePack's categoryAndFunction method.
*
* @return the String->String Function object
*/
Function<String,String> getCategoryAndFunctionFunction();
/**
* Accepts a String that is a start symbol of the treebank.
*
* @param str The str to test
* @return Whether this is a start symbol
*/
boolean isStartSymbol(String str);
/**
* Return a filter that accepts a String that is a start symbol
* of the treebank, and rejects everything else.
*
* @return The filter
*/
Predicate<String> startSymbolAcceptFilter();
/**
* Returns a String array of treebank start symbols.
*
* @return The start symbols
*/
String[] startSymbols();
/**
* Returns a String which is the first (perhaps unique) start symbol
* of the treebank, or null if none is defined.
*
* @return The start symbol
*/
String startSymbol();
/**
* Returns the extension of treebank files for this treebank.
* This should be passed as an argument to Treebank loading classes.
* It might be "mrg" or "fid" or whatever. Don't include the period.
*
* @return the extension on files for this treebank
*/
String treebankFileExtension();
/**
* Sets the grammatical function indicating character to gfCharacter.
*
* @param gfCharacter Sets the character in label names that sets of
* grammatical function marking (from the phrase label).
*/
void setGfCharacter(char gfCharacter);
/** Returns a TreeReaderFactory suitable for general purpose use
* with this language/treebank.
*
* @return A TreeReaderFactory suitable for general purpose use
* with this language/treebank.
*/
TreeReaderFactory treeReaderFactory();
/** Return a TokenizerFactory for Trees of this language/treebank.
*
* @return A TokenizerFactory for Trees of this language/treebank.
*/
TokenizerFactory<Tree> treeTokenizerFactory();
/**
* The HeadFinder to use for your treebank.
*
* @return A suitable HeadFinder
*/
HeadFinder headFinder();
/**
* The HeadFinder to use when making typed dependencies.
*
* @return A suitable HeadFinder
*/
HeadFinder typedDependencyHeadFinder();
/**
* The morphological feature specification for the language.
*
* @return A language-specific MorphoFeatureSpecification
*/
MorphoFeatureSpecification morphFeatureSpec();
/**
* Used for languages where an original Stanford Dependency
* converter and a Universal Dependency converter exists.
*/
void setGenerateOriginalDependencies(boolean generateOriginalDependencies);
/**
* Used for languages where an original Stanford Dependency
* converter and a Universal Dependency converter exists.
*/
boolean generateOriginalDependencies();
}