content: // This file is part of AceWiki.
  // Copyright 2008-2013, AceWiki developers.
  // 
  // AceWiki is free software: you can redistribute it and/or modify it under the terms of the GNU
  // Lesser General Public License as published by the Free Software Foundation, either version 3 of
  // the License, or (at your option) any later version.
  // 
  // AceWiki is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
  // even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  // Lesser General Public License for more details.
  // 
  // You should have received a copy of the GNU Lesser General Public License along with AceWiki. If
  // not, see http://www.gnu.org/licenses/.
  
  package ch.uzh.ifi.attempto.acewiki.aceowl;
  
  import java.util.ArrayList;
  import java.util.Collection;
  
  import ch.uzh.ifi.attempto.acewiki.core.Ontology;
  import ch.uzh.ifi.attempto.acewiki.core.OntologyElement;
  import ch.uzh.ifi.attempto.base.AbstractOption;
  import ch.uzh.ifi.attempto.chartparser.DynamicLexicon;
  import ch.uzh.ifi.attempto.chartparser.LexicalRule;
  
  /**
   * This class manages the lexical entries for AceWiki.
   * 
   * @author Tobias Kuhn
   */
  public class ACEOWLLexicon implements DynamicLexicon {
  	
  	private Ontology ontology;
  	
  	/**
  	 * Creates a new lexicon manager.
  	 */
  	public ACEOWLLexicon() {
  	}
  
  	/**
  	 * This is the first method to be called and provides the ontology object.
  	 * 
  	 * @param ontology The ontology object.
  	 */
  	public void init(Ontology ontology) {
  		this.ontology = ontology;
  	}
  
  	public Collection<LexicalRule> getLexRules(AbstractOption option) {
  		String catName = option.getCategoryName();
  		Collection<LexicalRule> lexRules = new ArrayList<LexicalRule>();
  		if (catName.equals("variable")) {
  			addVariableEntries(lexRules, "variable");
  		} else if (catName.equals("reference")) {
  			addVariableEntries(lexRules, "reference");
  		} else if (catName.equals("number")) {
  			for (int i = 2 ; i < 100 ; i++) {
  				lexRules.add(new LexicalRule("number", i + ""));
  			}
  		} else {
  			for (OntologyElement el : ontology.getOntologyElements()) {
  				if (el instanceof ACEOWLOntoElement) {
  					((ACEOWLOntoElement) el).collectLexicalRules(catName, lexRules);
  				}
  			}
  		}
  		for (LexicalRule r : lexRules) {
  			r.getCategory().setFeature("text", r.getWord().getName());
  		}
  		return lexRules;
  	}
  
  	public Collection<LexicalRule> getLexRules(String word) {
  		Collection<LexicalRule> lexRules = new ArrayList<LexicalRule>();
  		if (word.matches("[XYZ][0-9]*")) {
  			lexRules.add(new LexicalRule("variable", word));
  			lexRules.add(new LexicalRule("reference", word));
  		} else if (word.matches("[1-9][0-9]+|[2-9]")) {
  			lexRules.add(new LexicalRule("number", word));
  		} else {
  			OntologyElement oe = ontology.getElement(word);
  			if (word.startsWith("the ")) {
  				oe = ontology.getElement(word.substring(4));
  			}
  			if (oe != null && oe instanceof ACEOWLOntoElement) {
  				((ACEOWLOntoElement) oe).collectLexicalRules(null, lexRules);
  			}
  		}
  		for (LexicalRule r : lexRules) {
  			r.getCategory().setFeature("text", r.getWord().getName());
  		}
  		return lexRules;
  	}
  	
  	private static void addVariableEntries(Collection<LexicalRule> entries, String cat) {
  		for (String s : new String[] {"X", "Y", "Z"}) {
  			String t = s;
  			entries.add(new LexicalRule(cat, t));
  		}
  	}
  	
  	/**
  	 * Returns true if the string represents a valid word form.
  	 * 
  	 * @param s The string.
  	 * @return true if the string represents a valid word form.
  	 */
  	public static boolean isValidWordOrEmpty(String s) {
  		return s.matches("([a-zA-Z][a-zA-Z0-9_-]*)?");
  	}
  	
  	/**
  	 * Normalizes the string. White space characters are replaced by underscores.
  	 * 
  	 * @param s The input string.
  	 * @return The normalized string.
  	 */
  	public static String normalize(String s) {
  		return s.replaceAll("(\\s|_)+", "_").replaceAll("(^_|_$)", "");
  	}
  
  }
  