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/*
* esodata - data structures and other things, of varying utility
* Copyright 2022, Ben Culkin
*
* 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 3 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, see <https://www.gnu.org/licenses/>.
*/
package bjc.funcdata;
import java.util.function.UnaryOperator;
import bjc.data.Either;
import bjc.data.Pair;
import bjc.functypes.Unit;
public class CList<T> implements CListLike<T> {
private Either<Unit, Pair<T, CList<T>>> data;
private CList() {
data = Either.left(Unit.UNIT);
}
private CList(T data, CList<T> rest) {
this.data = Either.right(Pair.pair(data, rest));
}
@Override
public boolean isEmpty() {
return data.isLeft();
}
@Override
public T head() {
return data.forceRight().getLeft();
}
@Override
public CList<T> tail() {
return data.forceRight().getRight();
}
@Override
public CList<T> prefix(T val) {
return new CList<>(val, this);
}
public static <T> UnaryOperator<CList<T>> prefixing(T val) {
return (lst) -> lst.prefix(val);
}
public static <T> CList<T> empty() {
return new CList<>();
}
@SafeVarargs
public static <T> CList<T> of(T... vals) {
CList<T> ret = empty();
for (int i = vals.length - 1; i >= 0; i-- ) {
ret = ret.prefix(vals[i]);
}
return ret;
}
}
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