/*
 * ParseTree.java
 * Copyright (C) 2004-2005, Bjorn Bringert (bringert@cs.chalmers.se)
 * 
 * This library 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 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package se.chalmers.cs.gf.parse;

import se.chalmers.cs.gf.GFException;
import se.chalmers.cs.gf.abssyn.*;
import se.chalmers.cs.gf.SyntaxTree.TreeParser;
import se.chalmers.cs.gf.SyntaxTree.Absyn.Tr;

import java.util.*;

/**
 *  Parse a the parenthesized pre-order representation of abstract syntax
 *  use in GF.
 */
public class ParseTree implements Parser {

        public Collection<Tree> parse(String s) {
                try {
                        Tr tr = TreeParser.parseTree(s);
                        if (tr == null)
                                return new LinkedList<Tree>();
                        Tree t = GFTreeToTree.toTree(tr);
                        return Arrays.asList(t);
                } catch (GFException ex) {
                        //System.err.println(ex);
                        return new LinkedList<Tree>();
                }
        }

        public Collection<Tree> parse(String s, String cat) {
                if (!cat.equals("Tree"))
                        throw new GFException("Unsupported category " + cat);

                return parse(s);
        }

        public String getName() {
                return "tree";
        }

        public boolean tryThisOne() {
                return false;
        }

}