Replace WorldUtil methods with builtin alternatives

- Replace most 0 <= y < world.getHeight() checks with
  world.isBlockValid.
 - Remove several "in bounds" checks, as they'll be handled by later
   calls.

src/main/java/dan200/computercraft/ComputerCraft.java

@@ -61,7 +61,6 @@ import dan200.computercraft.shared.turtle.upgrades.*;
 import dan200.computercraft.shared.util.CreativeTabMain;
 import dan200.computercraft.shared.util.IDAssigner;
 import dan200.computercraft.shared.util.InventoryUtil;
-import dan200.computercraft.shared.util.WorldUtil;
 import dan200.computercraft.shared.wired.CapabilityWiredElement;
 import dan200.computercraft.shared.wired.WiredNode;
 import io.netty.buffer.Unpooled;
@@ -778,20 +777,12 @@ public class ComputerCraft
 
     public static int getDefaultBundledRedstoneOutput( World world, BlockPos pos, EnumFacing side )
     {
-        if( WorldUtil.isBlockInWorld( world, pos ) )
-        {
-            return DefaultBundledRedstoneProvider.getDefaultBundledRedstoneOutput( world, pos, side );
-        }
-        return -1;
+        return world.isValid( pos ) ? DefaultBundledRedstoneProvider.getDefaultBundledRedstoneOutput( world, pos, side ) : -1;
     }
 
     public static int getBundledRedstoneOutput( World world, BlockPos pos, EnumFacing side )
     {
-        int y = pos.getY();
-        if( y < 0 || y >= world.getHeight() )
-        {
-            return -1;
-        }
+        if( !world.isValid( pos ) ) return -1;
 
         // Try the handlers in order:
         int combinedSignal = -1;

src/main/java/dan200/computercraft/shared/computer/apis/CommandAPI.java

@@ -12,7 +12,6 @@ import dan200.computercraft.api.lua.ILuaAPI;
 import dan200.computercraft.api.lua.ILuaContext;
 import dan200.computercraft.api.lua.LuaException;
 import dan200.computercraft.shared.computer.blocks.TileCommandComputer;
-import dan200.computercraft.shared.util.WorldUtil;
 import net.minecraft.block.Block;
 import net.minecraft.block.properties.IProperty;
 import net.minecraft.block.state.IBlockState;
@@ -215,7 +214,7 @@ public class CommandAPI implements ILuaAPI
                         Math.max( miny, maxy ),
                         Math.max( minz, maxz )
                     );
-                    if( !WorldUtil.isBlockInWorld( world, min ) || !WorldUtil.isBlockInWorld( world, max ) )
+                    if( !world.isValid( min ) || !world.isValid( max ) )
                     {
                         throw new LuaException( "Co-ordinates out or range" );
                     }
@@ -250,7 +249,7 @@ public class CommandAPI implements ILuaAPI
                     // Get the details of the block
                     World world = m_computer.getWorld();
                     BlockPos position = new BlockPos( x, y, z );
-                    if( WorldUtil.isBlockInWorld( world, position ) )
+                    if( world.isValid( position ) )
                     {
                         return new Object[] { getBlockInfo( world, position ) };
                     }

src/main/java/dan200/computercraft/shared/computer/blocks/TileComputerBase.java

@@ -326,7 +326,7 @@ public abstract class TileComputerBase extends TileGeneric
         int localDir = remapLocalSide( DirectionUtil.toLocal( this, dir ) );
         if( !isRedstoneBlockedOnSide( localDir ) )
         {
-            computer.setRedstoneInput( localDir, RedstoneUtil.getRedstoneOutput( getWorld(), offset, offsetSide ) );
+            computer.setRedstoneInput( localDir, getWorld().getRedstonePower( offset, offsetSide ) );
             computer.setBundledRedstoneInput( localDir, RedstoneUtil.getBundledRedstoneOutput( getWorld(), offset, offsetSide ) );
         }
         if( !isPeripheralBlockedOnSide( localDir ) )

src/main/java/dan200/computercraft/shared/peripheral/monitor/TileMonitor.java

@@ -420,16 +420,10 @@ public class TileMonitor extends TilePeripheralBase
 
     private TileMonitor getSimilarMonitorAt( BlockPos pos )
     {
-        if( pos.equals( getPos() ) )
-        {
-            return this;
-        }
+        if( pos.equals( getPos() ) ) return this;
 
-        int y = pos.getY();
         World world = getWorld();
-        if( world != null && y >= 0 && y < world.getHeight() )
-        {
-            if( world.isBlockLoaded( pos ) )
+        if( world != null && world.isBlockLoaded( pos ) )
         {
             TileEntity tile = world.getTileEntity( pos );
             if( tile != null && tile instanceof TileMonitor )
@@ -442,8 +436,6 @@ public class TileMonitor extends TilePeripheralBase
                 }
             }
         }
-
-        }
         return null;
     }
 

src/main/java/dan200/computercraft/shared/turtle/core/TurtleCompareCommand.java

@@ -9,7 +9,6 @@ package dan200.computercraft.shared.turtle.core;
 import dan200.computercraft.api.turtle.ITurtleAccess;
 import dan200.computercraft.api.turtle.ITurtleCommand;
 import dan200.computercraft.api.turtle.TurtleCommandResult;
-import dan200.computercraft.shared.util.WorldUtil;
 import net.minecraft.block.Block;
 import net.minecraft.block.state.IBlockState;
 import net.minecraft.item.Item;
@@ -48,8 +47,6 @@ public class TurtleCompareCommand implements ITurtleCommand
         BlockPos newPosition = oldPosition.offset( direction );
 
         ItemStack lookAtStack = ItemStack.EMPTY;
-        if( WorldUtil.isBlockInWorld( world, newPosition ) )
-        {
         if( !world.isAirBlock( newPosition ) )
         {
             IBlockState lookAtState = world.getBlockState( newPosition );
@@ -107,7 +104,6 @@ public class TurtleCompareCommand implements ITurtleCommand
                 }
             }
         }
-        }
 
         // Compare them
         if( selectedStack.isEmpty() && lookAtStack.isEmpty() )

src/main/java/dan200/computercraft/shared/turtle/core/TurtleDetectCommand.java

@@ -37,14 +37,10 @@ public class TurtleDetectCommand implements ITurtleCommand
         BlockPos oldPosition = turtle.getPosition();
         BlockPos newPosition = oldPosition.offset( direction );
 
-        if( WorldUtil.isBlockInWorld( world, newPosition ) )
-        {
-            if( !WorldUtil.isLiquidBlock( world, newPosition ) &&
-                !world.isAirBlock( newPosition ) )
+        if( !WorldUtil.isLiquidBlock( world, newPosition ) && !world.isAirBlock( newPosition ) )
         {
             return TurtleCommandResult.success();
         }
-        }
 
         return TurtleCommandResult.failure();
     }

src/main/java/dan200/computercraft/shared/turtle/core/TurtleInspectCommand.java

@@ -11,7 +11,6 @@ import dan200.computercraft.api.turtle.ITurtleAccess;
 import dan200.computercraft.api.turtle.ITurtleCommand;
 import dan200.computercraft.api.turtle.TurtleCommandResult;
 import dan200.computercraft.api.turtle.event.TurtleBlockEvent;
-import dan200.computercraft.shared.util.WorldUtil;
 import net.minecraft.block.Block;
 import net.minecraft.block.properties.IProperty;
 import net.minecraft.block.state.IBlockState;
@@ -26,7 +25,6 @@ import java.util.Map;
 
 public class TurtleInspectCommand implements ITurtleCommand
 {
-    private static final boolean FAIL_ON_AIR = true;
     private final InteractDirection m_direction;
 
     public TurtleInspectCommand( InteractDirection direction )
@@ -44,13 +42,14 @@ public class TurtleInspectCommand implements ITurtleCommand
         // Check if thing in front is air or not
         World world = turtle.getWorld();
         BlockPos oldPosition = turtle.getPosition();
-        BlockPos newPosition = WorldUtil.moveCoords( oldPosition, direction );
+        BlockPos newPosition = oldPosition.offset( direction );
 
-        if( WorldUtil.isBlockInWorld( world, newPosition ) )
-        {
         IBlockState state = world.getBlockState( newPosition );
-            if( !FAIL_ON_AIR || !state.getBlock().isAir( state, world, newPosition ) )
+        if( state.getBlock().isAir( state, world, newPosition ) )
         {
+            return TurtleCommandResult.failure( "No block to inspect" );
+        }
+
         Block block = state.getBlock();
         String name = Block.REGISTRY.getNameForObject( block ).toString();
         int metadata = block.getMetaFromState( state );
@@ -78,23 +77,9 @@ public class TurtleInspectCommand implements ITurtleCommand
         // Fire the event, exiting if it is cancelled
         TurtlePlayer turtlePlayer = TurtlePlaceCommand.createPlayer( turtle, oldPosition, direction );
         TurtleBlockEvent.Inspect event = new TurtleBlockEvent.Inspect( turtle, turtlePlayer, world, newPosition, state, table );
-                if( MinecraftForge.EVENT_BUS.post( event ) )
-                {
-                    return TurtleCommandResult.failure( event.getFailureMessage() );
-                }
+        if( MinecraftForge.EVENT_BUS.post( event ) ) return TurtleCommandResult.failure( event.getFailureMessage() );
 
         return TurtleCommandResult.success( new Object[] { table } );
-            }
-        }
 
-        if( !FAIL_ON_AIR )
-        {
-            Map<Object, Object> table = new HashMap<>();
-            table.put( "name", "minecraft:air" );
-            table.put( "metadata", 0 );
-            table.put( "state", new HashMap<>() );
-            return TurtleCommandResult.success( new Object[] { table } );
-        }
-        return TurtleCommandResult.failure( "No block to inspect" );
     }
 }

src/main/java/dan200/computercraft/shared/turtle/core/TurtleMoveCommand.java

@@ -43,7 +43,7 @@ public class TurtleMoveCommand implements ITurtleCommand
         // Check if we can move
         World oldWorld = turtle.getWorld();
         BlockPos oldPosition = turtle.getPosition();
-        BlockPos newPosition = WorldUtil.moveCoords( oldPosition, direction );
+        BlockPos newPosition = oldPosition.offset( direction );
 
         TurtlePlayer turtlePlayer = TurtlePlaceCommand.createPlayer( turtle, oldPosition, direction );
         TurtleCommandResult canEnterResult = canEnter( turtlePlayer, oldWorld, newPosition );
@@ -158,14 +158,15 @@ public class TurtleMoveCommand implements ITurtleCommand
 
     private TurtleCommandResult canEnter( TurtlePlayer turtlePlayer, World world, BlockPos position )
     {
-        if( position.getY() < 0 )
+        if( world.isOutsideBuildHeight( position ) )
         {
-            return TurtleCommandResult.failure( "Too low to move" );
+            return TurtleCommandResult.failure( position.getY() < 0 ? "Too low to move" : "Too high to move" );
         }
-        else if( position.getY() > world.getHeight() - 1 )
+        else if( !world.isValid( position ) )
         {
-            return TurtleCommandResult.failure( "Too high to move" );
+            return TurtleCommandResult.failure( "Cannot leave the world" );
         }
+
         if( ComputerCraft.turtlesObeyBlockProtection )
         {
             // Check spawn protection

src/main/java/dan200/computercraft/shared/turtle/core/TurtlePlaceCommand.java

@@ -64,10 +64,10 @@ public class TurtlePlaceCommand implements ITurtleCommand
         // Remember old block
         EnumFacing direction = m_direction.toWorldDir( turtle );
         World world = turtle.getWorld();
-        BlockPos coordinates = WorldUtil.moveCoords( turtle.getPosition(), direction );
+        BlockPos coordinates = turtle.getPosition().offset( direction );
 
         // Create a fake player, and orient it appropriately
-        BlockPos playerPosition = WorldUtil.moveCoords( turtle.getPosition(), direction );
+        BlockPos playerPosition = turtle.getPosition().offset( direction );
         TurtlePlayer turtlePlayer = createPlayer( turtle, playerPosition, direction );
 
         TurtleBlockEvent.Place place = new TurtleBlockEvent.Place( turtle, turtlePlayer, turtle.getWorld(), coordinates, stack );
@@ -76,16 +76,6 @@ public class TurtlePlaceCommand implements ITurtleCommand
             return TurtleCommandResult.failure( place.getFailureMessage() );
         }
 
-        IBlockState previousState;
-        if( WorldUtil.isBlockInWorld( world, coordinates ) )
-        {
-            previousState = world.getBlockState( coordinates );
-        }
-        else
-        {
-            previousState = null;
-        }
-
         // Do the deploying
         String[] errorMessage = new String[1];
         ItemStack remainder = deploy( stack, turtle, turtlePlayer, direction, m_extraArguments, errorMessage );
@@ -119,7 +109,7 @@ public class TurtlePlaceCommand implements ITurtleCommand
     public static ItemStack deploy( @Nonnull ItemStack stack, ITurtleAccess turtle, EnumFacing direction, Object[] extraArguments, String[] o_errorMessage )
     {
         // Create a fake player, and orient it appropriately
-        BlockPos playerPosition = WorldUtil.moveCoords( turtle.getPosition(), direction );
+        BlockPos playerPosition = turtle.getPosition().offset( direction );
         TurtlePlayer turtlePlayer = createPlayer( turtle, playerPosition, direction );
 
         return deploy( stack, turtle, turtlePlayer, direction, extraArguments, o_errorMessage );
@@ -136,7 +126,7 @@ public class TurtlePlaceCommand implements ITurtleCommand
 
         // Deploy on the block immediately in front
         BlockPos position = turtle.getPosition();
-        BlockPos newPosition = WorldUtil.moveCoords( position, direction );
+        BlockPos newPosition = position.offset( direction );
         remainder = deployOnBlock( stack, turtle, turtlePlayer, newPosition, direction.getOpposite(), extraArguments, true, o_errorMessage );
         if( remainder != stack )
         {
@@ -144,7 +134,7 @@ public class TurtlePlaceCommand implements ITurtleCommand
         }
 
         // Deploy on the block one block away
-        remainder = deployOnBlock( stack, turtle, turtlePlayer, WorldUtil.moveCoords( newPosition, direction ), direction.getOpposite(), extraArguments, false, o_errorMessage );
+        remainder = deployOnBlock( stack, turtle, turtlePlayer, newPosition.offset( direction ), direction.getOpposite(), extraArguments, false, o_errorMessage );
         if( remainder != stack )
         {
             return remainder;
@@ -299,7 +289,7 @@ public class TurtlePlaceCommand implements ITurtleCommand
     private static boolean canDeployOnBlock( @Nonnull ItemStack stack, ITurtleAccess turtle, TurtlePlayer player, BlockPos position, EnumFacing side, boolean allowReplaceable, String[] o_errorMessage )
     {
         World world = turtle.getWorld();
-        if( WorldUtil.isBlockInWorld( world, position ) &&
+        if( world.isValid( position ) &&
             !world.isAirBlock( position ) &&
             !(stack.getItem() instanceof ItemBlock && WorldUtil.isLiquidBlock( world, position )) )
         {
@@ -312,19 +302,9 @@ public class TurtlePlaceCommand implements ITurtleCommand
                 if( ComputerCraft.turtlesObeyBlockProtection )
                 {
                     // Check spawn protection
-                    boolean editable = true;
-                    if( replaceable )
-                    {
-                        editable = ComputerCraft.isBlockEditable( world, position, player );
-                    }
-                    else
-                    {
-                        BlockPos shiftedPos = WorldUtil.moveCoords( position, side );
-                        if( WorldUtil.isBlockInWorld( world, shiftedPos ) )
-                        {
-                            editable = ComputerCraft.isBlockEditable( world, shiftedPos, player );
-                        }
-                    }
+                    boolean editable = replaceable
+                        ? ComputerCraft.isBlockEditable( world, position, player )
+                        : ComputerCraft.isBlockEditable( world, position.offset( side ), player );
                     if( !editable )
                     {
                         if( o_errorMessage != null )
@@ -356,7 +336,7 @@ public class TurtlePlaceCommand implements ITurtleCommand
 
         // Re-orient the fake player
         EnumFacing playerDir = side.getOpposite();
-        BlockPos playerPosition = WorldUtil.moveCoords( position, side );
+        BlockPos playerPosition = position.offset( side );
         orientPlayer( turtle, turtlePlayer, playerPosition, playerDir );
 
         // Calculate where the turtle would hit the block
@@ -421,7 +401,7 @@ public class TurtlePlaceCommand implements ITurtleCommand
                 TileEntity tile = world.getTileEntity( position );
                 if( tile == null || tile == existingTile )
                 {
-                    tile = world.getTileEntity( WorldUtil.moveCoords( position, side ) );
+                    tile = world.getTileEntity( position.offset( side ) );
                 }
                 if( tile instanceof TileEntitySign )
                 {

src/main/java/dan200/computercraft/shared/turtle/core/TurtleSuckCommand.java

@@ -12,7 +12,6 @@ import dan200.computercraft.api.turtle.TurtleAnimation;
 import dan200.computercraft.api.turtle.TurtleCommandResult;
 import dan200.computercraft.api.turtle.event.TurtleInventoryEvent;
 import dan200.computercraft.shared.util.InventoryUtil;
-import dan200.computercraft.shared.util.WorldUtil;
 import net.minecraft.entity.Entity;
 import net.minecraft.entity.item.EntityItem;
 import net.minecraft.item.ItemStack;
@@ -54,7 +53,7 @@ public class TurtleSuckCommand implements ITurtleCommand
         // Get inventory for thing in front
         World world = turtle.getWorld();
         BlockPos oldPosition = turtle.getPosition();
-        BlockPos newPosition = WorldUtil.moveCoords( oldPosition, direction );
+        BlockPos newPosition = oldPosition.offset( direction );
         EnumFacing side = direction.getOpposite();
 
         IItemHandler inventory = InventoryUtil.getInventory( world, newPosition, side );

src/main/java/dan200/computercraft/shared/util/InventoryUtil.java

@@ -49,9 +49,6 @@ public class InventoryUtil
     public static IItemHandler getInventory( World world, BlockPos pos, EnumFacing side )
     {
         // Look for tile with inventory
-        int y = pos.getY();
-        if( y >= 0 && y < world.getHeight() )
-        {
         TileEntity tileEntity = world.getTileEntity( pos );
         if( tileEntity != null )
         {
@@ -69,7 +66,6 @@ public class InventoryUtil
                 return new InvWrapper( (IInventory) tileEntity );
             }
         }
-        }
 
         // Look for entity with inventory
         Vec3d vecStart = new Vec3d(

src/main/java/dan200/computercraft/shared/util/PeripheralUtil.java

@@ -10,11 +10,6 @@ public class PeripheralUtil
 {
     public static IPeripheral getPeripheral( World world, BlockPos pos, EnumFacing side )
     {
-        int y = pos.getY();
-        if( y >= 0 && y < world.getHeight() && !world.isRemote )
-        {
-            return ComputerCraft.getPeripheralAt( world, pos, side );
-        }
-        return null;
+        return world.isValid( pos ) && !world.isRemote ? ComputerCraft.getPeripheralAt( world, pos, side ) : null;
     }
 }

src/main/java/dan200/computercraft/shared/util/RedstoneUtil.java

@@ -15,11 +15,6 @@ import net.minecraft.world.World;
 
 public class RedstoneUtil
 {
-    public static int getRedstoneOutput( World world, BlockPos pos, EnumFacing side )
-    {
-        return world.getRedstonePower( pos, side );
-    }
-
     public static int getBundledRedstoneOutput( World world, BlockPos pos, EnumFacing side )
     {
         int signal = ComputerCraft.getBundledRedstoneOutput( world, pos, side );

src/main/java/dan200/computercraft/shared/util/WorldUtil.java

@@ -24,19 +24,9 @@ import java.util.List;
 
 public class WorldUtil
 {
-    public static boolean isBlockInWorld( World world, BlockPos pos )
-    {
-        return pos.getY() >= 0 && pos.getY() < world.getHeight();
-    }
-
     public static boolean isLiquidBlock( World world, BlockPos pos )
     {
-        return isBlockInWorld( world, pos ) && world.getBlockState( pos ).getMaterial().isLiquid();
-    }
-
-    public static BlockPos moveCoords( BlockPos pos, EnumFacing dir )
-    {
-        return pos.offset( dir );
+        return world.getBlockState( pos ).getMaterial().isLiquid();
     }
 
     public static Pair<Entity, Vec3d> rayTraceEntities( World world, Vec3d vecStart, Vec3d vecDir, double distance )