org.armedbear.lisp.adjust_array Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of abcl Show documentation
Common Lisp implementation running on the JVM
There is a newer version: 1.9.2
/*
 * adjust_array.java
 *
 * Copyright (C) 2004-2007 Peter Graves
 * $Id$
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 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.*;

// ### %adjust-array array new-dimensions element-type initial-element
// initial-element-p initial-contents initial-contents-p fill-pointer
// displaced-to displaced-index-offset => new-array
public final class adjust_array extends Primitive
{
    public adjust_array()
    {
        super("%adjust-array", PACKAGE_SYS, false);
    }

    @Override
    public LispObject execute(LispObject[] args)
    {
        if (args.length != 10)
            return error(new WrongNumberOfArgumentsException(this, 10));
        AbstractArray array = checkArray(args[0]);
        LispObject dimensions = args[1];
        LispObject elementType = args[2];
        boolean initialElementProvided = args[4] != NIL;
        boolean initialContentsProvided = args[6] != NIL;
        LispObject initialElement = initialElementProvided ? args[3] : null;
        LispObject initialContents = initialContentsProvided ? args[5] : null;
        LispObject fillPointer = args[7];
        LispObject displacedTo = args[8];
        LispObject displacedIndexOffset = args[9];
        if (initialElementProvided && initialContentsProvided) {
            return error(new LispError("ADJUST-ARRAY: cannot specify both initial element and initial contents."));
        }
        if (elementType != array.getElementType() &&
            getUpgradedArrayElementType(elementType) != array.getElementType())
        {
            return error(new LispError("ADJUST-ARRAY: incompatible element type."));
        }
        if (array.getRank() == 0) {
            return array.adjustArray(new int[0], initialElement, initialContents);
        }
        if (!initialElementProvided && array.getElementType() == T)
            initialElement = Fixnum.ZERO;
        if (array.getRank() == 1) {
            final int newSize;
            if (dimensions instanceof Cons && dimensions.length() == 1)
                newSize = Fixnum.getValue(dimensions.car());
            else
                newSize = Fixnum.getValue(dimensions);
            if (array instanceof AbstractVector) {
                AbstractVector v = (AbstractVector) array;
                AbstractArray v2;
                if (displacedTo != NIL) {
                    final int displacement;
                    if (displacedIndexOffset == NIL)
                        displacement = 0;
                    else
                        displacement = Fixnum.getValue(displacedIndexOffset);
                    v2 = v.adjustArray(newSize,
                                        checkArray(displacedTo),
                                        displacement);
                } else {
                    v2 = v.adjustArray(newSize,
                                        initialElement,
                                        initialContents);
                }
                if (fillPointer != NIL)
                    v2.setFillPointer(fillPointer);
                return v2;
            }
        }
        // rank > 1
        final int rank = dimensions.listp() ? dimensions.length() : 1;
        int[] dimv = new int[rank];
        if (dimensions.listp()) {
            for (int i = 0; i < rank; i++) {
                LispObject dim = dimensions.car();
                dimv[i] = Fixnum.getValue(dim);
                dimensions = dimensions.cdr();
            }
        } else
            dimv[0] = Fixnum.getValue(dimensions);

        if (displacedTo != NIL) {
            final int displacement;
            if (displacedIndexOffset == NIL)
                displacement = 0;
            else
                displacement = Fixnum.getValue(displacedIndexOffset);
            return array.adjustArray(dimv,
                                     checkArray(displacedTo),
                                     displacement);
        } else {
            return array.adjustArray(dimv,
                                     initialElement,
                                     initialContents);
        }
    }

    private static final Primitive _ADJUST_ARRAY = new adjust_array();
}