Beispiel #1
0
  // get signs with additional args for a known special token const, target pred and target rel
  private SignHash getSignsFromWord(
      Word w, String specialTokenConst, String targetPred, String targetRel) throws LexException {

    Collection<MorphItem> morphItems =
        (specialTokenConst == null) ? (Collection<MorphItem>) _words.get(w) : null;

    if (morphItems == null) {
      // check for special tokens
      if (specialTokenConst == null) {
        specialTokenConst =
            tokenizer.getSpecialTokenConstant(tokenizer.isSpecialToken(w.getForm()));
        targetPred = w.getForm();
      }
      if (specialTokenConst != null) {
        Word key = Word.createSurfaceWord(w, specialTokenConst);
        morphItems = (Collection<MorphItem>) _words.get(key);
      }
      // otherwise throw lex exception
      if (morphItems == null) throw new LexException(w + " not in lexicon");
    }

    SignHash result = new SignHash();

    for (Iterator<MorphItem> MI = morphItems.iterator(); MI.hasNext(); ) {
      getWithMorphItem(w, MI.next(), targetPred, targetRel, result);
    }

    return result;
  }
Beispiel #2
0
 // look up and apply coarts for w to each sign in result
 @SuppressWarnings("unchecked")
 private void applyCoarts(Word w, SignHash result) throws LexException {
   List<Sign> inputSigns = new ArrayList<Sign>(result.asSignSet());
   result.clear();
   List<Sign> outputSigns = new ArrayList<Sign>(inputSigns.size());
   // for each surface attr, lookup coarts and apply to input signs, storing results in output
   // signs
   for (Iterator<Pair<String, String>> it = w.getSurfaceAttrValPairs(); it.hasNext(); ) {
     Pair<String, String> p = it.next();
     String attr = (String) p.a;
     if (!_indexedCoartAttrs.contains(attr)) continue;
     String val = (String) p.b;
     Word coartWord = Word.createWord(attr, val);
     SignHash coartResult = getSignsFromWord(coartWord, null, null, null);
     for (Iterator<Sign> it2 = coartResult.iterator(); it2.hasNext(); ) {
       Sign coartSign = it2.next();
       // apply to each input
       for (int j = 0; j < inputSigns.size(); j++) {
         Sign sign = inputSigns.get(j);
         grammar.rules.applyCoart(sign, coartSign, outputSigns);
       }
     }
     // switch output to input for next iteration
     inputSigns.clear();
     inputSigns.addAll(outputSigns);
     outputSigns.clear();
   }
   // add results back
   result.addAll(inputSigns);
 }
Beispiel #3
0
 /**
  * For a given word, return all of its surface word's lexical entries. If the word is not listed
  * in the lexicon, the tokenizer is consulted to see if it is a special token (date, time, etc.);
  * otherwise an exception is thrown. If the word has coarticulations, all applicable
  * coarticulation entries are applied to the base word, in an arbitrary order.
  *
  * @param w the word
  * @return a sign hash
  * @exception LexException thrown if word not found
  */
 public SignHash getSignsFromWord(Word w) throws LexException {
   // reduce word to its core, removing coart attrs if any
   Word surfaceWord = Word.createSurfaceWord(w);
   Word coreWord =
       (surfaceWord.attrsIntersect(_coartAttrs))
           ? Word.createCoreSurfaceWord(surfaceWord, _coartAttrs)
           : surfaceWord;
   // lookup core word
   SignHash result = getSignsFromWord(coreWord, null, null, null);
   if (result.size() == 0) {
     throw new LexException(coreWord + " not found in lexicon");
   }
   // return signs if no coart attrs
   if (coreWord == surfaceWord) return result;
   // otherwise apply coarts for word
   applyCoarts(surfaceWord, result);
   return result;
 }
Beispiel #4
0
  // get signs using an additional arg for a target rel
  private Collection<Sign> getSignsFromPredAndTargetRel(String pred, String targetRel) {

    Collection<Word> words = (Collection<Word>) _predToWords.get(pred);
    String specialTokenConst = null;

    // for robustness, when using supertagger, add words for pred sans sense index
    int dotIndex = -1;
    if (_supertagger != null
        && !Character.isDigit(pred.charAt(0))
        && // skip numbers
        (dotIndex = pred.lastIndexOf('.')) > 0
        && pred.length() > dotIndex + 1
        && pred.charAt(dotIndex + 1) != '_') // skip titles, eg Mr._Smith
    {
      String barePred = pred.substring(0, dotIndex);
      Collection<Word> barePredWords = (Collection<Word>) _predToWords.get(barePred);
      if (words == null) words = barePredWords;
      else if (barePredWords != null) {
        Set<Word> unionWords = new HashSet<Word>(words);
        unionWords.addAll(barePredWords);
        words = unionWords;
      }
    }

    if (words == null) {
      specialTokenConst = tokenizer.getSpecialTokenConstant(tokenizer.isSpecialToken(pred));
      if (specialTokenConst == null) return null;
      // lookup words with pred = special token const
      Collection<Word> specialTokenWords = (Collection<Word>) _predToWords.get(specialTokenConst);
      // replace special token const with pred
      if (specialTokenWords == null) return null;
      words = new ArrayList<Word>(specialTokenWords.size());
      for (Iterator<Word> it = specialTokenWords.iterator(); it.hasNext(); ) {
        Word stw = it.next();
        Word w = Word.createSurfaceWord(stw, pred);
        words.add(w);
      }
    }

    List<Sign> retval = new ArrayList<Sign>();
    for (Iterator<Word> it = words.iterator(); it.hasNext(); ) {
      Word w = it.next();
      try {
        SignHash signs = getSignsFromWord(w, specialTokenConst, pred, targetRel);
        retval.addAll(signs.asSignSet());
      }
      // shouldn't happen
      catch (LexException exc) {
        System.err.println("Unexpected lex exception for word " + w + ": " + exc);
      }
    }
    return retval;
  }
Beispiel #5
0
  // given EntriesItem
  private void getWithEntriesItem(
      Word w,
      MorphItem mi,
      String stem,
      String pred,
      String targetPred,
      String targetRel,
      EntriesItem item,
      MacroAdder macAdder,
      Map<String, Double> supertags,
      Set<String> supertagsFound,
      SignHash result) {
    // ensure apropos
    if (targetPred != null && !targetPred.equals(pred)) return;
    if (targetRel != null
        && !targetRel.equals(item.getIndexRel())
        && !targetRel.equals(item.getCoartRel())) return;
    if (!item.getActive().booleanValue()) return;
    if (mi.excluded(item)) return;

    try {
      // copy and add macros
      Category cat = item.getCat().copy();
      macAdder.addMacros(cat);

      // replace DEFAULT_VAL with pred, after first
      // unifying type of associated nom var(s) with sem class
      unifySemClass(cat, mi.getWord().getSemClass());
      REPLACEMENT = pred;
      cat.deepMap(defaultReplacer);

      // check supertag
      // TODO: think about earlier checks for efficiency, for grammars where macros and preds don't
      // matter
      // Double lexprob = null; // nb: skipping lex log probs, don't seem to be helpful
      if (supertags != null) {
        // skip if not found
        String stag = cat.getSupertag();
        if (!supertags.containsKey(stag)) return;
        // otherwise update found supertags
        supertagsFound.add(stag);
        // get lex prob
        // lexprob = supertags.get(stag);
      }

      // propagate types of nom vars
      propagateTypes(cat);

      // handle distrib attrs and inherits-from
      propagateDistributiveAttrs(cat);
      expandInheritsFrom(cat);

      // merge stem, pos, sem class from morph item, plus supertag from cat
      Word word = Word.createFullWord(w, mi.getWord(), cat.getSupertag());

      // set origin and lexprob
      Sign sign = new Sign(word, cat);
      sign.setOrigin();
      // if (lexprob != null) {
      //	sign.addData(new SupertaggerAdapter.LexLogProb((float) Math.log10(lexprob)));
      // }
      // return sign
      result.insert(sign);
    } catch (RuntimeException exc) {
      System.err.println(
          "Warning: ignoring entry: "
              + item.getName()
              + " of family: "
              + item.getFamilyName()
              + " for stem: "
              + stem
              + " b/c: "
              + exc.toString());
    }
  }
Beispiel #6
0
  /** Loads the lexicon and morph files. */
  public void init(URL lexiconUrl, URL morphUrl) throws IOException {

    List<Family> lexicon = null;
    List<MorphItem> morph = null;
    List<MacroItem> macroModel = null;

    // load category families (lexicon), morph forms and macros
    lexicon = getLexicon(lexiconUrl);
    Pair<List<MorphItem>, List<MacroItem>> morphInfo = getMorph(morphUrl);
    morph = morphInfo.a;
    macroModel = morphInfo.b;

    // index words; also index stems to words, as default preds
    // store indexed coarticulation attrs too
    _words = new GroupMap<Word, MorphItem>();
    _predToWords = new GroupMap<String, Word>();
    _coartAttrs = new HashSet<String>();
    _indexedCoartAttrs = new HashSet<String>();
    for (MorphItem morphItem : morph) {
      Word surfaceWord = morphItem.getSurfaceWord();
      _words.put(surfaceWord, morphItem);
      _predToWords.put(morphItem.getWord().getStem(), surfaceWord);
      if (morphItem.isCoart()) {
        Word indexingWord = morphItem.getCoartIndexingWord();
        _words.put(indexingWord, morphItem);
        Pair<String, String> first = indexingWord.getSurfaceAttrValPairs().next();
        _indexedCoartAttrs.add(first.a);
        for (Iterator<Pair<String, String>> it = surfaceWord.getSurfaceAttrValPairs();
            it.hasNext(); ) {
          Pair<String, String> p = it.next();
          _coartAttrs.add(p.a);
        }
      }
    }

    // index entries based on stem+pos
    _stems = new GroupMap<String, Object>();
    _posToEntries = new GroupMap<String, EntriesItem[]>();
    // index entries by supertag+pos, for supertagging
    _stagToEntries = new GroupMap<String, EntriesItem>();
    // also index rels and coart rels to preds
    _relsToPreds = new GroupMap<String, String>();
    _coartRelsToPreds = new GroupMap<String, String>();
    // and gather list of attributes used per atomic category type
    _catsToAttrs = new GroupMap<String, String>();
    _lfAttrs = new HashSet<String>();
    // and remember family and ent, names, for checking excluded list on morph items
    HashSet<String> familyAndEntryNames = new HashSet<String>();

    // index each family
    for (Family family : lexicon) {

      familyAndEntryNames.add(family.getName());
      EntriesItem[] entries = family.getEntries();
      DataItem[] data = family.getData();

      // for generic use when we get an unknown stem
      // from the morphological analyzer
      if (!family.isClosed()) {
        _posToEntries.put(family.getPOS(), entries);
      }

      // scan through entries
      for (int j = 0; j < entries.length; j++) {
        // index
        EntriesItem eItem = entries[j];
        _stagToEntries.put(eItem.getSupertag() + family.getPOS(), eItem);
        if (eItem.getStem().length() > 0) {
          _stems.put(eItem.getStem() + family.getPOS(), eItem);
        }
        try {
          // gather features
          eItem.getCat().forall(gatherAttrs);
          // record names
          familyAndEntryNames.add(eItem.getName());
          familyAndEntryNames.add(eItem.getQualifiedName());
        } catch (RuntimeException exc) {
          System.err.println("exception for: " + family.getName() + ": " + exc);
        }
      }

      // scan through data
      for (int j = 0; j < data.length; j++) {
        DataItem dItem = data[j];
        _stems.put(
            dItem.getStem() + family.getPOS(), new Pair<DataItem, EntriesItem[]>(dItem, entries));
        // index non-default preds to words
        if (!dItem.getStem().equals(dItem.getPred())) {
          Collection<Word> words = (Collection<Word>) _predToWords.get(dItem.getStem());
          if (words == null) {
            if (!openlex) {
              System.out.print("Warning: couldn't find words for pred '");
              System.out.println(dItem.getPred() + "' with stem '" + dItem.getStem() + "'");
            }
          } else {
            for (Iterator<Word> it = words.iterator(); it.hasNext(); ) {
              _predToWords.put(dItem.getPred(), it.next());
            }
          }
        }
      }

      // index rels to preds
      // nb: this covers relational (eg @x<GenRel>e) and featural (eg @e<tense>past)
      //     elementary predications
      List<String> indexRels = new ArrayList<String>(3);
      String familyIndexRel = family.getIndexRel();
      if (familyIndexRel.length() > 0) {
        indexRels.add(familyIndexRel);
      }
      for (int j = 0; j < entries.length; j++) {
        EntriesItem eItem = entries[j];
        String indexRel = eItem.getIndexRel();
        if (indexRel.length() > 0 && !indexRel.equals(familyIndexRel)) {
          indexRels.add(indexRel);
        }
      }
      for (Iterator<String> it = indexRels.iterator(); it.hasNext(); ) {
        String indexRel = it.next();
        // nb: not indexing on entries items, b/c some stems are still defaults
        for (int j = 0; j < data.length; j++) {
          DataItem dItem = data[j];
          _relsToPreds.put(indexRel, dItem.getPred());
        }
      }

      // index coart rels (features, really) to preds
      String coartRel = family.getCoartRel();
      if (coartRel.length() > 0) {
        for (int j = 0; j < data.length; j++) {
          _coartRelsToPreds.put(coartRel, data[j].getPred());
        }
      }
    }

    // index the macros
    _macros = new GroupMap<String, FeatureStructure>();
    // nb: could just index MacroItem objects for feature structures too;
    //     this might be a bit cleaner, but life is short
    _macroItems = new HashMap<String, MacroItem>();
    for (MacroItem mi : macroModel) {
      String macName = mi.getName();
      FeatureStructure[] specs = mi.getFeatureStructures();
      for (int j = 0; j < specs.length; j++) {
        _macros.put(macName, specs[j]);
      }
      // this is for handling LF part of macros
      _macroItems.put(macName, mi);
    }

    // with morph items, check POS, macro names, excluded list for xref
    for (MorphItem morphItem : morph) {
      Word w = morphItem.getWord();
      if (!openlex
          && !_stems.containsKey(w.getStem() + w.getPOS())
          && !_posToEntries.containsKey(w.getPOS())) {
        System.err.println(
            "Warning: no entries for stem '"
                + w.getStem()
                + "' and POS '"
                + w.getPOS()
                + "' found for word '"
                + w
                + "'");
      }
      String[] macroNames = morphItem.getMacros();
      for (int j = 0; j < macroNames.length; j++) {
        if (!_macroItems.containsKey(macroNames[j])) {
          System.err.println(
              "Warning: macro "
                  + macroNames[j]
                  + " not found for word '"
                  + morphItem.getWord()
                  + "'");
        }
      }
      String[] excludedNames = morphItem.getExcluded();
      for (int j = 0; j < excludedNames.length; j++) {
        if (!familyAndEntryNames.contains(excludedNames[j])) {
          System.err.println(
              "Warning: excluded family or entry '"
                  + excludedNames[j]
                  + "' not found for word '"
                  + morphItem.getWord()
                  + "'");
        }
      }
    }
  }