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166 changes: 166 additions & 0 deletions
166
src/main/java/io/wispforest/affinity/endec/CodecUtils.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,166 @@ | ||
| package io.wispforest.affinity.endec; | ||
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| import com.mojang.datafixers.util.Pair; | ||
| import com.mojang.serialization.*; | ||
| import io.wispforest.affinity.endec.edm.EdmOps; | ||
| import io.wispforest.affinity.mixin.endec.ForwardingDynamicOpsAccessor; | ||
| import io.wispforest.endec.*; | ||
| import io.wispforest.endec.format.edm.*; | ||
| import net.minecraft.util.Util; | ||
| import net.minecraft.util.dynamic.ForwardingDynamicOps; | ||
|
|
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| import java.util.HashMap; | ||
| import java.util.Map; | ||
| import java.util.function.Supplier; | ||
| import java.util.stream.Stream; | ||
|
|
||
| public class CodecUtils { | ||
|
|
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| /** | ||
| * Create a new endec serializing the same data as {@code codec} | ||
| * <p> | ||
| * This method is implemented by converting all data to be (de-)serialized | ||
| * to the Endec Data Model data format (hereto-forth to be referred to as EDM) | ||
| * which has both an endec ({@link EdmEndec}) and DynamicOps implementation ({@link EdmOps}). | ||
| * Since EDM encodes structure using a self-described format's native structural types, | ||
| * <b>this means that for JSON and NBT, the created endec's serialized representation is identical | ||
| * to that of {@code codec}</b>. In general, for non-self-described formats, the serialized | ||
| * representation is a byte array | ||
| * <p> | ||
| * When decoding, an EDM element is read from the deserializer and then parsed using {@code codec} | ||
| * <p> | ||
| * When encoding, the value is encoded using {@code codec} to an EDM element which is then | ||
| * written into the serializer | ||
| */ | ||
| public static <T> Endec<T> toEndec(Codec<T> codec) { | ||
| return Endec.of( | ||
| (ctx, serializer, value) -> { | ||
| var ops = createEdmOps(ctx); | ||
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| EdmEndec.INSTANCE.encode(ctx, serializer, Util.getResult(codec.encodeStart(ops, value), IllegalStateException::new)); | ||
| }, | ||
| (ctx, deserializer) -> { | ||
| var ops = createEdmOps(ctx); | ||
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| return Util.getResult(codec.parse(ops, EdmEndec.INSTANCE.decode(ctx, deserializer)), IllegalStateException::new); | ||
| } | ||
| ); | ||
| } | ||
|
|
||
| //-- | ||
|
|
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| /** | ||
| * Create a codec serializing the same data as this endec, assuming | ||
| * that the serialized format posses the {@code assumedAttributes} | ||
| * <p> | ||
| * This method is implemented by converting between a given DynamicOps' | ||
| * datatype and EDM (see {@link #toEndec(Codec)}) and then encoding/decoding | ||
| * from/to an EDM element using the {@link EdmSerializer} and {@link EdmDeserializer} | ||
| * <p> | ||
| * The serialized representation of a codec created through this method is generally | ||
| * identical to that of a codec manually created to describe the same data | ||
| */ | ||
| public static <T> Codec<T> toCodec(Endec<T> endec, SerializationContext assumedContext) { | ||
| return new Codec<>() { | ||
| @Override | ||
| public <D> DataResult<Pair<T, D>> decode(DynamicOps<D> ops, D input) { | ||
| return captureThrows(() -> { | ||
| return new Pair<>(endec.decode(createContext(ops, assumedContext), LenientEdmDeserializer.of(ops.convertTo(EdmOps.withoutContext(), input))), input); | ||
| }); | ||
| } | ||
|
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| @Override | ||
| @SuppressWarnings("unchecked") | ||
| public <D> DataResult<D> encode(T input, DynamicOps<D> ops, D prefix) { | ||
| return captureThrows(() -> { | ||
| return EdmOps.withoutContext().convertTo(ops, endec.encodeFully(createContext(ops, assumedContext), EdmSerializer::of, input)); | ||
| }); | ||
| } | ||
| }; | ||
| } | ||
|
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| public static <T> Codec<T> toCodec(Endec<T> endec) { | ||
| return toCodec(endec, SerializationContext.empty()); | ||
| } | ||
|
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| public static <T> MapCodec<T> toMapCodec(StructEndec<T> structEndec, SerializationContext assumedContext) { | ||
| return new MapCodec<>() { | ||
| @Override | ||
| public <T1> Stream<T1> keys(DynamicOps<T1> ops) { | ||
| throw new UnsupportedOperationException("MapCodec generated from StructEndec cannot report keys"); | ||
| } | ||
|
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| @Override | ||
| public <T1> DataResult<T> decode(DynamicOps<T1> ops, MapLike<T1> input) { | ||
| return captureThrows(() -> { | ||
| var map = new HashMap<String, EdmElement<?>>(); | ||
| input.entries().forEach(pair -> { | ||
| map.put( | ||
| Util.getResult(ops.getStringValue(pair.getFirst()), s -> new IllegalStateException("Unable to parse key: " + s)), | ||
| ops.convertTo(EdmOps.withoutContext(), pair.getSecond()) | ||
| ); | ||
| }); | ||
|
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| return structEndec.decode(createContext(ops, assumedContext), LenientEdmDeserializer.of(EdmElement.wrapMap(map))); | ||
| }); | ||
| } | ||
|
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| @Override | ||
| public <T1> RecordBuilder<T1> encode(T input, DynamicOps<T1> ops, RecordBuilder<T1> prefix) { | ||
| try { | ||
| var context = createContext(ops, assumedContext); | ||
|
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| var element = structEndec.encodeFully(context, EdmSerializer::of, input).<Map<String, EdmElement<?>>>cast(); | ||
|
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| var result = prefix; | ||
| for (var entry : element.entrySet()) { | ||
| result = result.add(entry.getKey(), EdmOps.withoutContext().convertTo(ops, entry.getValue())); | ||
| } | ||
|
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| return result; | ||
| } catch (Exception e) { | ||
| return prefix.withErrorsFrom(DataResult.error(e::getMessage, input)); | ||
| } | ||
| } | ||
| }; | ||
| } | ||
|
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| public static <T> MapCodec<T> toMapCodec(StructEndec<T> structEndec) { | ||
| return toMapCodec(structEndec, SerializationContext.empty()); | ||
| } | ||
|
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| //-- | ||
|
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| public static SerializationContext createContext(DynamicOps<?> ops, SerializationContext assumedContext) { | ||
| var rootOps = ops; | ||
| while (rootOps instanceof ForwardingDynamicOps<?>) rootOps = ((ForwardingDynamicOpsAccessor<?>) rootOps).owo$delegate(); | ||
|
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| var context = rootOps instanceof EdmOps edmOps | ||
| ? edmOps.capturedContext().and(assumedContext) | ||
| : assumedContext; | ||
|
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| // if (ops instanceof RegistryOps<?> registryOps) { | ||
| // context = context.withAttributes(RegistriesAttribute.tryFromCachedInfoGetter(((RegistryOpsAccessor) registryOps).owo$infoGetter())); | ||
| // } | ||
|
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| return context; | ||
| } | ||
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| public static DynamicOps<EdmElement<?>> createEdmOps(SerializationContext ctx) { | ||
| DynamicOps<EdmElement<?>> ops = EdmOps.withContext(ctx); | ||
|
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| // if (ctx.hasAttribute(RegistriesAttribute.REGISTRIES)) { | ||
| // ops = RegistryOps.of(ops, ctx.getAttributeValue(RegistriesAttribute.REGISTRIES).infoGetter()); | ||
| // } | ||
|
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| return ops; | ||
| } | ||
|
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| private static <T> DataResult<T> captureThrows(Supplier<T> action) { | ||
| try { | ||
| return DataResult.success(action.get()); | ||
| } catch (Exception e) { | ||
| return DataResult.error(e::getMessage); | ||
| } | ||
| } | ||
| } |
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