edu.northwestern.at.utils.corpuslinguistics.postagger.regexp
Class RegexpTagger

java.lang.Object
  edu.northwestern.at.utils.IsCloseableObject
      edu.northwestern.at.utils.corpuslinguistics.postagger.AbstractPartOfSpeechTagger
          edu.northwestern.at.utils.corpuslinguistics.postagger.unigram.UnigramTagger
              edu.northwestern.at.utils.corpuslinguistics.postagger.regexp.RegexpTagger

All Implemented Interfaces:

UsesLexicon, CanTagOneWord, PartOfSpeechTagger, IsCloseable, UsesLogger

public class RegexpTagger
extends UnigramTagger
implements PartOfSpeechTagger, CanTagOneWord

Regular Expression Part of Speech tagger.

The regular expression part of speech tagger uses a regular expressions to assign a part of speech tag to a spelling.

Field Summary

protected java.util.regex.Matcher[]	regexpMatchers
protected java.util.regex.Pattern[]	regexpPatterns Parts of speech for each lexical rule.
protected java.lang.String[]	regexpTags

Fields inherited from class edu.northwestern.at.utils.corpuslinguistics.postagger.AbstractPartOfSpeechTagger

contextRules, contextualSmoother, dynamicLexicon, lexicalRules, lexicalSmoother, lexicon, logger, partOfSpeechGuesser, postTokenizer, retagger, ruleCorrections, transitionMatrix

Constructor Summary

RegexpTagger()
Create a suffix tagger.

Method Summary

void	setLexicalRules(java.lang.String[] lexicalRules) Set lexical rules for tagging.
java.lang.String	tagWord(java.lang.String word) Tag a single word.
java.lang.String	toString() Return tagger description.
boolean	usesLexicalRules() See if tagger uses lexical rules.

Methods inherited from class edu.northwestern.at.utils.corpuslinguistics.postagger.unigram.UnigramTagger

tagAdornedWordList, tagWord

Methods inherited from class edu.northwestern.at.utils.corpuslinguistics.postagger.AbstractPartOfSpeechTagger

clearRuleCorrections, createPartOfSpeechGuesser, getDynamicLexicon, getLexicon, getLexicon, getLogger, getMostCommonTag, getPartOfSpeechGuesser, getRetagger, getRuleCorrections, getTagCount, getTagsForWord, getTransitionMatrix, incrementRuleCorrections, retagWords, setContextRules, setLexicon, setLogger, setPartOfSpeechGuesser, setRetagger, setTransitionMatrix, tagAdornedWordSentence, tagAdornedWordSentences, tagSentence, tagSentences, usesContextRules, usesTransitionProbabilities

Methods inherited from class edu.northwestern.at.utils.IsCloseableObject

close

Methods inherited from class java.lang.Object

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

Methods inherited from interface edu.northwestern.at.utils.corpuslinguistics.postagger.PartOfSpeechTagger

clearRuleCorrections, getLexicon, getLexicon, getPartOfSpeechGuesser, getRetagger, getRuleCorrections, getTagCount, getTagsForWord, getTransitionMatrix, incrementRuleCorrections, retagWords, setContextRules, setLexicon, setPartOfSpeechGuesser, setRetagger, setTransitionMatrix, tagAdornedWordList, tagAdornedWordSentence, tagAdornedWordSentences, tagSentence, tagSentences, usesContextRules, usesTransitionProbabilities

Methods inherited from interface edu.northwestern.at.utils.corpuslinguistics.postagger.CanTagOneWord

tagWord

Methods inherited from interface edu.northwestern.at.utils.IsCloseable

close

Field Detail

regexpPatterns

protected java.util.regex.Pattern[] regexpPatterns

Parts of speech for each lexical rule.

regexpMatchers

protected java.util.regex.Matcher[] regexpMatchers

regexpTags

protected java.lang.String[] regexpTags

Constructor Detail

RegexpTagger

public RegexpTagger()

Create a suffix tagger.

Method Detail

usesLexicalRules

public boolean usesLexicalRules()

See if tagger uses lexical rules.

Specified by:

usesLexicalRules in interface PartOfSpeechTagger

Overrides:

usesLexicalRules in class AbstractPartOfSpeechTagger

Returns:

True since this tagger uses regular expression based lexical rules.

setLexicalRules

public void setLexicalRules(java.lang.String[] lexicalRules)
                     throws InvalidRuleException

Set lexical rules for tagging.

Specified by:

setLexicalRules in interface PartOfSpeechTagger

Overrides:

setLexicalRules in class AbstractPartOfSpeechTagger

Parameters:

lexicalRules - String array of lexical rules.

Throws:

InvalidRuleException - if a rule is bad.

For the regular expression tagger, each rule takes the form:

regular-expression \t part-of-speech-tag

where "regular expression" is the regular expression and "part-of-speech-tag" is the part of speech tag to assign to a spelling matched by the regular expression. An ascii tab character (\t) separates the pattern from the tag.

tagWord

public java.lang.String tagWord(java.lang.String word)

Tag a single word.

Specified by:

tagWord in interface CanTagOneWord

Overrides:

tagWord in class UnigramTagger

Parameters:

word - The word.

Returns:

The part of speech for the word.

Applies each of the regular expressions stored in the lexical rules lexicon and returns the tag of associated with the first matching regular expression.

toString

public java.lang.String toString()

Return tagger description.

Overrides:

toString in class UnigramTagger

Returns:

Tagger description.