source: branches/0.22.x/abcl/src/org/armedbear/lisp/AbstractString.java

/*
 * AbstractString.java
 *
 * Copyright (C) 2004 Peter Graves
 * $Id: AbstractString.java 12431 2010-02-08 08:05:15Z mevenson $
 *
 * 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.
 *
 * As a special exception, the copyright holders of this library give you
 * permission to link this library with independent modules to produce an
 * executable, regardless of the license terms of these independent
 * modules, and to copy and distribute the resulting executable under
 * terms of your choice, provided that you also meet, for each linked
 * independent module, the terms and conditions of the license of that
 * module.  An independent module is a module which is not derived from
 * or based on this library.  If you modify this library, you may extend
 * this exception to your version of the library, but you are not
 * obligated to do so.  If you do not wish to do so, delete this
 * exception statement from your version.
 */

package org.armedbear.lisp;

import static org.armedbear.lisp.Lisp.*;

public abstract class AbstractString extends AbstractVector
{
    @Override
    public LispObject typep(LispObject type)
    {
        if (type instanceof Symbol) {
            if (type == Symbol.STRING)
                return T;
            if (type == Symbol.BASE_STRING)
                return T;
        }
        if (type == BuiltInClass.STRING)
            return T;
        if (type == BuiltInClass.BASE_STRING)
            return T;
        return super.typep(type);
    }

    @Override
    public final boolean stringp()
    {
        return true;
    }

    @Override
    public LispObject getElementType()
    {
        return Symbol.CHARACTER;
    }

    @Override
    public final boolean isSimpleVector()
    {
        return false;
    }

    @Override
    public final LispObject STRING()
    {
        return this;
    }

    public abstract void fill(char c);

    public abstract char charAt(int index);

    public abstract void setCharAt(int index, char c);

    public final String writeToString(int beginIndex, int endIndex)

    {
        if (beginIndex < 0)
            beginIndex = 0;
        final int limit;
        limit = length();
        if (endIndex > limit)
            endIndex = limit;
        final LispThread thread = LispThread.currentThread();
        if (Symbol.PRINT_ESCAPE.symbolValue(thread) != NIL ||
            Symbol.PRINT_READABLY.symbolValue(thread) != NIL)
        {
            StringBuilder sb = new StringBuilder("\"");
            for (int i = beginIndex; i < endIndex; i++) {
                char c = charAt(i);
                if (c == '\"' || c == '\\')
                    sb.append('\\');
                sb.append(c);
            }
            sb.append('"');
            return sb.toString();
        } else
            return getStringValue().substring(beginIndex, endIndex);
    }

    @Override
    public String writeToString()
    {
        return writeToString(0, length());
    }

    public String toString() {
      int length = length();
      StringBuilder sb = new StringBuilder(length);
      for(int i = 0; i < length; ++i) {
      sb.append(charAt(i));
      }
      return sb.toString();
    }

}