org.armedbear.lisp.SlimeInputStream 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
/*
 * SlimeInputStream.java
 *
 * Copyright (C) 2004 Andras Simon, 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., 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 class SlimeInputStream extends Stream
{
    String s;
    int length;
    final Function f;
    final Stream ostream;

    public SlimeInputStream(Function f, Stream ostream)
    {
        super(Symbol.SLIME_INPUT_STREAM);
        elementType = Symbol.CHARACTER;
        isInputStream = true;
        isOutputStream = false;
        isCharacterStream = true;
        isBinaryStream = false;
        eolStyle = EolStyle.LF;
        this.f = f;
        this.ostream = ostream;
    }

    @Override
    public LispObject typeOf()
    {
        return Symbol.SLIME_INPUT_STREAM;
    }

    @Override
    public LispObject classOf()
    {
        return BuiltInClass.SLIME_INPUT_STREAM;
    }

    @Override
    public LispObject typep(LispObject type)
    {
        if (type == Symbol.SLIME_INPUT_STREAM)
            return T;
        if (type == Symbol.STRING_STREAM)
            return T;
        if (type == BuiltInClass.SLIME_INPUT_STREAM)
            return T;
        if (type == BuiltInClass.STRING_STREAM)
            return T;
        return super.typep(type);
    }

    @Override
    public LispObject close(LispObject abort)
    {
        setOpen(false);
        return T;
    }

    @Override
    public LispObject listen()
    {
        return offset < length ? T : NIL;
    }

    @Override
    protected int _readChar()
    {
        if (offset >= length) {
            ostream.finishOutput();
            s = LispThread.currentThread().execute(f).getStringValue();
            if (s.length() == 0)
                return -1;
            offset = 0;
            length = s.length();
        }
        int n = s.charAt(offset);
        ++offset;
        if (n == '\n')
            ++lineNumber;
        return n;
    }

    @Override
    protected void _unreadChar(int n)
    {
        if (offset > 0) {
            --offset;
            if (n == '\n')
                --lineNumber;
        }
    }

    @Override
    protected boolean _charReady()
    {
        return offset < length;
    }


    @Override
    public void _clearInput()
    {
        super._clearInput();
        s = "";
        offset = 0;
        length = 0;
        lineNumber = 0;
    }

    // ### make-slime-input-stream
    // make-slime-input-stream function output-stream => slime-input-stream
    private static final Primitive MAKE_SLIME_INPUT_STREAM =
        new Primitive("make-slime-input-stream", PACKAGE_EXT, true,
                      "function output-stream")
    {
        @Override
        public LispObject execute(LispObject first, LispObject second)

        {
            final Function fun;
            final Stream os;
            if (first instanceof Symbol)
                fun = (Function)first.getSymbolFunction();
            else
                fun = (Function)first;
            os = checkCharacterOutputStream(second);
            return new SlimeInputStream(fun, os);
        }
    };
}