Code/net/minecraft/world/level/block/GrassBlock.java

package net.minecraft.world.level.block;

import com.mojang.serialization.MapCodec;
import java.util.List;
import java.util.Optional;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Holder;
import net.minecraft.core.registries.Registries;
import net.minecraft.data.worldgen.placement.VegetationPlacements;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.util.RandomSource;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.LevelReader;
import net.minecraft.world.level.block.state.BlockBehaviour;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.levelgen.feature.ConfiguredFeature;
import net.minecraft.world.level.levelgen.feature.configurations.RandomPatchConfiguration;
import net.minecraft.world.level.levelgen.placement.PlacedFeature;

public class GrassBlock extends SpreadingSnowyDirtBlock implements BonemealableBlock {
    public static final MapCodec<GrassBlock> CODEC = simpleCodec(GrassBlock::new);

    @Override
    public MapCodec<GrassBlock> codec() {
        return CODEC;
    }

    public GrassBlock(BlockBehaviour.Properties p_53685_) {
        super(p_53685_);
    }

    @Override
    public boolean isValidBonemealTarget(LevelReader p_256229_, BlockPos p_256432_, BlockState p_255677_) {
        return p_256229_.getBlockState(p_256432_.above()).isAir();
    }

    @Override
    public boolean isBonemealSuccess(Level p_221275_, RandomSource p_221276_, BlockPos p_221277_, BlockState p_221278_) {
        return true;
    }

    @Override
    public void performBonemeal(ServerLevel p_221270_, RandomSource p_221271_, BlockPos p_221272_, BlockState p_221273_) {
        BlockPos blockpos = p_221272_.above();
        BlockState blockstate = Blocks.SHORT_GRASS.defaultBlockState();
        Optional<Holder.Reference<PlacedFeature>> optional = p_221270_.registryAccess().lookupOrThrow(Registries.PLACED_FEATURE).get(VegetationPlacements.GRASS_BONEMEAL);

        label51:
        for (int i = 0; i < 128; i++) {
            BlockPos blockpos1 = blockpos;

            for (int j = 0; j < i / 16; j++) {
                blockpos1 = blockpos1.offset(p_221271_.nextInt(3) - 1, (p_221271_.nextInt(3) - 1) * p_221271_.nextInt(3) / 2, p_221271_.nextInt(3) - 1);
                if (!p_221270_.getBlockState(blockpos1.below()).is(this) || p_221270_.getBlockState(blockpos1).isCollisionShapeFullBlock(p_221270_, blockpos1)) {
                    continue label51;
                }
            }

            BlockState blockstate1 = p_221270_.getBlockState(blockpos1);
            if (blockstate1.is(blockstate.getBlock()) && p_221271_.nextInt(10) == 0) {
                BonemealableBlock bonemealableblock = (BonemealableBlock)blockstate.getBlock();
                if (bonemealableblock.isValidBonemealTarget(p_221270_, blockpos1, blockstate1)) {
                    bonemealableblock.performBonemeal(p_221270_, p_221271_, blockpos1, blockstate1);
                }
            }

            if (blockstate1.isAir()) {
                Holder<PlacedFeature> holder;
                if (p_221271_.nextInt(8) == 0) {
                    List<ConfiguredFeature<?, ?>> list = p_221270_.getBiome(blockpos1).value().getGenerationSettings().getFlowerFeatures();
                    if (list.isEmpty()) {
                        continue;
                    }

                    int k = p_221271_.nextInt(list.size());
                    holder = ((RandomPatchConfiguration)list.get(k).config()).feature();
                } else {
                    if (!optional.isPresent()) {
                        continue;
                    }

                    holder = optional.get();
                }

                holder.value().place(p_221270_, p_221270_.getChunkSource().getGenerator(), p_221271_, blockpos1);
            }
        }
    }

    @Override
    public BonemealableBlock.Type getType() {
        return BonemealableBlock.Type.NEIGHBOR_SPREADER;
    }
}