EOseq.java

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2016-2024 Objectionary.com
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
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 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
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 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

/*
 * @checkstyle PackageNameCheck (4 lines)
 */
package EOorg.EOeolang;

import org.eolang.AtFree;
import org.eolang.Atom;
import org.eolang.Data;
import org.eolang.Dataized;
import org.eolang.PhConst;
import org.eolang.PhDefault;
import org.eolang.PhWith;
import org.eolang.Phi;
import org.eolang.Versionized;
import org.eolang.XmirObject;

/**
 * SEQ.
 * @since 1.0
 * @checkstyle TypeNameCheck (5 lines)
 */
@Versionized
@XmirObject(oname = "seq")
public final class EOseq extends PhDefault implements Atom {

    /**
     * Ctor.
     * @param sigma Sigma
     */
    public EOseq(final Phi sigma) {
        super(sigma);
        this.add("steps", new AtFree());
    }

    @Override
    public Phi lambda() {
        final Phi args = new PhConst(this.attr("steps").get());
        final Long length = new Dataized(
            args.attr("length").get()
        ).take(Long.class);
        for (long idx = 0; idx < length - 1; ++idx) {
            new Dataized(
                new PhWith(
                    args.attr("at").get().copy(),
                    0, new Data.ToPhi(idx)
                )
            ).take();
        }
        final Phi ret;
        if (length > 0) {
            final Phi last = args.attr("at").get().copy();
            last.attr(0).put(new Data.ToPhi(length - 1));
            ret = last;
        } else {
            ret = new Data.ToPhi(false);
        }
        return ret;
    }
}