305 lines
12 KiB
Java
305 lines
12 KiB
Java
package carpet.script.annotation;
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import java.lang.annotation.Documented;
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import java.lang.annotation.Retention;
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import java.lang.annotation.Target;
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import java.lang.reflect.AnnotatedType;
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import java.util.Iterator;
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import net.minecraft.core.BlockPos;
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import net.minecraft.world.level.block.state.BlockState;
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import com.google.common.collect.Lists;
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import carpet.script.CarpetContext;
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import carpet.script.Context;
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import carpet.script.argument.Argument;
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import carpet.script.argument.BlockArgument;
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import carpet.script.argument.FunctionArgument;
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import carpet.script.argument.Vector3Argument;
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import carpet.script.Module;
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import carpet.script.value.BlockValue;
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import carpet.script.value.FunctionValue;
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import carpet.script.value.Value;
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import javax.annotation.Nullable;
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import static java.lang.annotation.ElementType.PARAMETER;
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import static java.lang.annotation.ElementType.TYPE_USE;
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import static java.lang.annotation.RetentionPolicy.RUNTIME;
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/**
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* <p>Class that holds the annotations for {@link Argument} locators, in order for them to be used in Scarpet functions.</p>
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*/
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public interface Locator
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{
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/**
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* <p>Represents that the annotated argument must be gotten by passing the arguments in there into a {@link BlockArgument} locator.</p>
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*
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* <p>Must be used in either {@link BlockArgument}, {@link BlockValue}, {@link BlockPos} or {@link BlockState} parameters</p>
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*/
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@Documented
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@Retention(RUNTIME)
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@Target({ PARAMETER, TYPE_USE })
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@interface Block
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{
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/**
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* <p>Whether or not should the locator accept a single {@link String} as the parameter and let parsing to {@link BlockValue}.</p>
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*/
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boolean acceptString() default false;
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/**
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* <p>Whether or not should the {@link BlockValue} argument be optional.</p> <p>Requires the annotation to be present in a
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* {@link BlockArgument} type, since it may return that the {@link BlockValue} is {@code null}, which would be considered as an incorrect
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* type.</p>
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*/
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boolean optional() default false;
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/**
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* <p>Whether or not should the {@link BlockArgument} locator accept any string as the argument.</p> <p>Requires the annotation to be present
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* in a {@link BlockArgument} type, since it may just return a {@link String}</p>
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*/
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boolean anyString() default false;
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}
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/**
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* <p>Represents that the annotated argument must be gotten by passing the arguments in there into a {@link Vector3Argument} locator.</p>
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*
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* <p>Must be used in either a {@link Vector3Argument} or a {@link net.minecraft.world.phys.Vec3 Vec3d} parameter.</p>
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*/
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@Documented
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@Retention(RUNTIME)
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@Target({ PARAMETER, TYPE_USE })
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@interface Vec3d
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{
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/**
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* <p>Whether or not should the {@link Vector3Argument} locator accept an optional direction aside from the
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* {@link net.minecraft.world.phys.Vec3}</p> <p>This parameter can only be used in a {@link Vector3Argument} type, since else there is no way
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* to get the direction too.</p>
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*/
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boolean optionalDirection() default false;
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/**
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* <p>Whether or not should the {@link Vector3Argument} locator accept an entity aside to get the {@link Vec3d} from and return that entity
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* too</p> <p>Note that you will only be able to get that entity if the annotation is present in a {@link Vector3Argument}</p>
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*/
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boolean optionalEntity() default false;
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}
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/**
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* <p>Represents that the annotated argument must be gotten by passing the arguments in this annotation into a {@link FunctionArgument}
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* locator</p>
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*
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* <p>Can be used in both {@link FunctionArgument} and {@link FunctionValue} types, but the last won't have access to arguments provided to the
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* function, even though they will still be consumed from the arguments the function was called with.</p>
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*
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* <p><b>This will consume any remaining parameters passed to the function, therefore any other parameter after this will throw.</b></p>
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*/
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@Documented
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@Retention(RUNTIME)
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@Target({ PARAMETER, TYPE_USE })
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@interface Function
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{
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/**
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* <p>Whether this Locator should allow no function to be passed.</p> <p>This is not compatible with {@link FunctionValue} type, since a
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* converter returning {@code null} will throw as if the passed argument was incorrect. You can still use it when targeting
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* {@link FunctionArgument}</p>
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*/
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boolean allowNone() default false;
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/**
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* <p>Whether the locator should check that the number of arguments passed along with the function matches the number of arguments that the
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* located function requires. Note that FunctionLocators consume all remaining arguments even if this is set to {@code false}.</p>
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*/
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boolean checkArgs();
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}
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/**
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* <p>Class that holds locators and methods to get them</p>
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*
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* <p>Not part of the public API, just that interfaces must have all members public</p>
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*/
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final class Locators
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{
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private Locators()
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{
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super();
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}
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static <R> ValueConverter<R> fromAnnotatedType(AnnotatedType annoType, Class<R> type)
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{
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if (annoType.isAnnotationPresent(Block.class))
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{
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return new BlockLocator<>(annoType.getAnnotation(Block.class), type);
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}
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if (annoType.isAnnotationPresent(Function.class))
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{
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return new FunctionLocator<>(annoType.getAnnotation(Function.class), type);
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}
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if (annoType.isAnnotationPresent(Vec3d.class))
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{
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return new Vec3dLocator<>(annoType.getAnnotation(Vec3d.class), type);
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}
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throw new IllegalStateException("Locator#fromAnnotatedType got called with an incompatible AnnotatedType");
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}
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private static class BlockLocator<R> extends AbstractLocator<R>
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{
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private final java.util.function.Function<BlockArgument, R> returnFunction;
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private final boolean acceptString;
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private final boolean anyString;
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private final boolean optional;
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public BlockLocator(Block annotation, Class<R> type)
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{
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super();
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this.acceptString = annotation.acceptString();
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this.anyString = annotation.anyString();
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this.optional = annotation.optional();
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if (type != BlockArgument.class && (anyString || optional))
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{
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throw new IllegalArgumentException("Can only use anyString or optional parameters of Locator.Block if targeting a BlockArgument");
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}
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this.returnFunction = getReturnFunction(type);
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if (returnFunction == null)
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{
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throw new IllegalArgumentException("Locator.Block can only be used against BlockArgument, BlockValue, BlockPos or BlockState types!");
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}
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}
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@Nullable
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@SuppressWarnings("unchecked")
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private static <R> java.util.function.Function<BlockArgument, R> getReturnFunction(Class<R> type)
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{
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if (type == BlockArgument.class)
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{
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return r -> (R) r;
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}
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if (type == BlockValue.class)
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{
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return r -> (R) r.block;
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}
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if (type == BlockPos.class)
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{
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return r -> (R) r.block.getPos();
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}
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if (type == BlockState.class)
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{
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return r -> (R) r.block.getBlockState();
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}
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return null;
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}
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@Override
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public String getTypeName()
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{
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return "block";
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}
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@Override
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public R checkAndConvert(Iterator<Value> valueIterator, Context context, Context.Type theLazyT)
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{
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BlockArgument locator = BlockArgument.findIn((CarpetContext) context, valueIterator, 0, acceptString, optional, anyString);
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return returnFunction.apply(locator);
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}
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}
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private static class Vec3dLocator<R> extends AbstractLocator<R>
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{
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private final boolean optionalDirection;
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private final boolean optionalEntity;
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private final boolean returnVec3d;
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public Vec3dLocator(Vec3d annotation, Class<R> type)
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{
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this.optionalDirection = annotation.optionalDirection();
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this.optionalEntity = annotation.optionalEntity();
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this.returnVec3d = type == net.minecraft.world.phys.Vec3.class; // Because of the locator
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if (returnVec3d && optionalDirection)
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{
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throw new IllegalArgumentException("optionalDirection Locator.Vec3d cannot be used for Vec3d type, use Vector3Argument instead");
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}
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if (!returnVec3d && type != Vector3Argument.class)
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{
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throw new IllegalArgumentException("Locator.Vec3d can only be used in Vector3Argument or Vec3d types");
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}
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}
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@Override
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public String getTypeName()
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{
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return "position";
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}
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@Override
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public R checkAndConvert(Iterator<Value> valueIterator, Context context, Context.Type theLazyT)
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{
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Vector3Argument locator = Vector3Argument.findIn(valueIterator, 0, optionalDirection, optionalEntity);
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@SuppressWarnings("unchecked") R ret = (R) (returnVec3d ? locator.vec : locator);
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return ret;
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}
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}
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private static class FunctionLocator<R> extends AbstractLocator<R>
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{
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private final boolean returnFunctionValue;
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private final boolean allowNone;
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private final boolean checkArgs;
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FunctionLocator(Function annotation, Class<R> type)
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{
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super();
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this.returnFunctionValue = type == FunctionValue.class;
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if (!returnFunctionValue && type != FunctionArgument.class)
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{
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throw new IllegalArgumentException("Params annotated with Locator.Function must be of either FunctionArgument or FunctionValue type");
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}
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this.allowNone = annotation.allowNone();
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this.checkArgs = annotation.checkArgs();
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if (returnFunctionValue && allowNone)
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{
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throw new IllegalArgumentException("Cannot use allowNone of Locator.Function in FunctionValue types, use FunctionArgument");
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}
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}
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@Override
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public R checkAndConvert(Iterator<Value> valueIterator, Context context, Context.Type theLazyT)
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{
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Module module = context.host.main;
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FunctionArgument locator = FunctionArgument.findIn(context, module, Lists.newArrayList(valueIterator), 0, allowNone, checkArgs);
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@SuppressWarnings("unchecked") R ret = (R) (returnFunctionValue ? locator.function : locator);
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return ret;
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}
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@Override
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public String getTypeName()
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{
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return "function";
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}
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}
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private abstract static class AbstractLocator<R> implements ValueConverter<R>, Locator
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{
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@Override
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public R convert(Value value, @Nullable Context context)
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{
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throw new UnsupportedOperationException("Cannot call a locator in a parameter that doesn't contain a context!");
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}
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@Override
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public boolean consumesVariableArgs()
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{
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return true;
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}
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@Override
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public int valueConsumption()
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{
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return 1;
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}
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@Override
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public abstract R checkAndConvert(Iterator<Value> valueIterator, Context context, Context.Type theLazyT);
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}
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}
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}
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