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Sigma knowledge engineering system is an system for developing, viewing and debugging theories in first order logic. It works with Knowledge Interchange Format (KIF) and is optimized for the Suggested Upper Merged Ontology (SUMO) www.ontologyportal.org.

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/*
 * Copyright 2014-2015 IPsoft
 *
 * Author: Andrei Holub [email protected]
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program ; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA  02111-1307 USA
 */

package com.articulate.sigma.semRewrite.substitutor;

import com.google.common.collect.Lists;

import java.util.Iterator;
import java.util.List;
import java.util.Objects;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class SubstitutionUtil {

    // predicate(word-1, word-2)
    // predicate(word, word-1)
    // predicate(word, word)
    // predicate(word-1, word)
    public static final Pattern CLAUSE_SPLITTER = Pattern.compile("([^\\(]+)\\((.+?(-\\d+)?),\\s*(.+?(-\\d+)?)\\)");
    public static final Pattern CLAUSE_PARAM = Pattern.compile("(.+)-(\\d+)");

    /** **************************************************************
     * Takes the list of clauses and substitutes them using provided substitutor.
     * If both arguments are substituted to the same group, this entry will be
     * removed from the original input.
     */
    public static void groupClauses(ClauseSubstitutor substitutor, List clauses) {

        Iterator clauseIterator = clauses.iterator();
        List modifiedClauses = Lists.newArrayList();
        while (clauseIterator.hasNext()) {
            String clause = clauseIterator.next();
            Matcher m = CLAUSE_SPLITTER.matcher(clause);
            if (m.matches()) {
                // FIXME LOW: Still waiting for optimization
                String attr1 = m.group(2);
                String attr2 = m.group(4);
                if ((m.group(3) != null && substitutor.containsKey(attr1))
                        || (m.group(5) != null && substitutor.containsKey(attr2))) {
                    CoreLabelSequence attr1Grouped = substitutor.getGrouped(attr1);
                    CoreLabelSequence attr2Grouped = substitutor.getGrouped(attr2);
                    clauseIterator.remove();
                    if (!Objects.equals(attr1Grouped, attr2Grouped)) {
                        String label = m.group(1);
                        String arg1 = attr1Grouped.toLabelString().orElse(attr1);
                        String arg2 = attr2Grouped.toLabelString().orElse(attr2);
                        modifiedClauses.add(label + "(" + arg1  + "," + arg2 + ")");
                    }
                }
            }
        }

        clauses.addAll(modifiedClauses);
    }
}