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Add zomListMap method for creating zero/one/many element List MapCodec 添加零一多元素列表 MapCodec #81

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Merged
Gu-ZT merged 2 commits into from
Jul 12, 2026
+22 −0
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Add zomListMap method for creating zero/one/many element List MapCodec 添加零一多元素列表 MapCodec #81

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ce694a0
feat(codec): add zomListMap method for creating zero/one/many element…
QiuShui1012 Jul 12, 2026
e503052
chore(codec): remove unused inport and revert irrelevant codec style …
QiuShui1012 Jul 12, 2026
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22 changes: 22 additions & 0 deletions module.codec/src/main/java/dev/anvilcraft/lib/v2/codec/CodecUtil.java
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,7 @@
import net.minecraft.world.level.storage.loot.providers.number.NumberProvider;
import net.minecraft.world.level.storage.loot.providers.number.NumberProviders;

import java.util.Collections;
import java.util.Deque;
import java.util.LinkedList;
import java.util.List;
Expand Down Expand Up @@ -359,6 +360,27 @@ public static <T extends Comparable<T>> MapCodec<BlockState> appendBlockStatePro
).xmap(pair -> pair.getFirst().setValue(property, pair.getSecond().value()), state -> Pair.of(state, property.value(state)));
}

/// 构建一个 `ZOM列表`（零/一/多元素列表）MapCodec
///
/// @param codec 元素编解码器
/// @param name 名称
/// @return `ZOM列表`（零/一/多元素列表）MapCodec
public static <T> MapCodec<List<T>> zomListMap(Codec<T> codec, String name) {
return Codec.mapEither(codec.optionalFieldOf(name), codec.listOf().fieldOf(name)).xmap(
either -> either.map(
op -> op
.map(Collections::singletonList)
.orElse(List.of()),
Function.identity()
),
list -> list.size() <= 1
? list.isEmpty()
? Either.left(Optional.empty())
: Either.left(Optional.of(list.getFirst()))
: Either.right(list)
);
}

/// 创建 {@link Codec} 的便携方法，对 {@link RecordCodecBuilder#create(Function)} 的代理
///
/// <p>参考了 {@link net.minecraft.network.codec.StreamCodec#composite(StreamCodec, Function, Function)} 的设计</p>
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