Pull my onlyIf from GT++

src/main/java/com/gtnewhorizon/structurelib/alignment/IAlignment.java

@@ -14,6 +14,10 @@ public interface IAlignment extends IAlignmentLimits,IAlignmentProvider {
 
     ExtendedFacing getExtendedFacing();
 
+    /**
+     * Set the facing without additional checks.
+     * Tools altering facing should use {@link #toolSetExtendedFacing(ExtendedFacing)} instead.
+     */
     void setExtendedFacing(ExtendedFacing alignment);
 
     IAlignmentLimits getAlignmentLimits();

src/main/java/com/gtnewhorizon/structurelib/alignment/enumerable/ExtendedFacing.java

@@ -4,6 +4,7 @@ import com.google.common.collect.ImmutableSet;
 import com.gtnewhorizon.structurelib.alignment.IAlignment;
 import com.gtnewhorizon.structurelib.alignment.IntegerAxisSwap;
 import com.gtnewhorizon.structurelib.util.Vec3Impl;
+import net.minecraft.util.StatCollector;
 import net.minecraft.util.Vec3;
 import net.minecraftforge.common.util.ForgeDirection;
 
@@ -276,6 +277,10 @@ public enum ExtendedFacing {
         return this.name;
     }
 
+    public String getLocalizedName() {
+        return StatCollector.translateToLocal("structurelib.facing." + getIndex());
+    }
+
     public static ExtendedFacing byName(String name) {
         return name == null ? null : NAME_LOOKUP.get(name.toLowerCase(Locale.ROOT));
     }

src/main/java/com/gtnewhorizon/structurelib/structure/StructureUtility.java

@@ -27,13 +27,7 @@ import java.util.Objects;
 import java.util.Set;
 import java.util.TreeMap;
 import java.util.TreeSet;
-import java.util.function.BiConsumer;
-import java.util.function.BiFunction;
-import java.util.function.BiPredicate;
-import java.util.function.Consumer;
-import java.util.function.Function;
-import java.util.function.IntBinaryOperator;
-import java.util.function.Supplier;
+import java.util.function.*;
 
 import static java.lang.Integer.MIN_VALUE;
 
@@ -816,6 +810,28 @@ public class StructureUtility {
 
 	//endregion
 
+	/**
+	 * Enable this structure element only if given predicate returns true.
+	 */
+	public static <T> IStructureElement<T> onlyIf(Predicate<? super T> predicate, IStructureElement<? super T> downstream) {
+		return new IStructureElement<T>() {
+			@Override
+			public boolean check(T t, World world, int x, int y, int z) {
+				return predicate.test(t) && downstream.check(t, world, x, y, z);
+			}
+
+			@Override
+			public boolean spawnHint(T t, World world, int x, int y, int z, ItemStack trigger) {
+				return predicate.test(t) && downstream.spawnHint(t, world, x, y, z, trigger);
+			}
+
+			@Override
+			public boolean placeBlock(T t, World world, int x, int y, int z, ItemStack trigger) {
+				return predicate.test(t) && downstream.placeBlock(t, world, x, y, z, trigger);
+			}
+		};
+	}
+
 	/**
 	 * Take care while chaining, as it will try to call every structure element until it returns true.
 	 * If none does it will finally return false.

src/main/resources/assets/structurelib/lang/en_US.lang

@@ -51,6 +51,103 @@ structurelib.blockhint.15.name=Hint error
 structurelib.blockhint.desc.5=ERROR, what did u expect?
 itemGroup.structurelib=StructureLib
 
+structurelib.facing.0=down normal none
+structurelib.facing.1=down normal horizontal
+structurelib.facing.2=down normal vertical
+structurelib.facing.3=down normal both
+structurelib.facing.4=down clockwise none
+structurelib.facing.5=down clockwise horizontal
+structurelib.facing.6=down clockwise vertical
+structurelib.facing.7=down clockwise both
+structurelib.facing.8=down upside down
+structurelib.facing.9=down upside down
+structurelib.facing.10=down upside down
+structurelib.facing.11=down upside down
+structurelib.facing.12=down counter clockwise
+structurelib.facing.13=down counter clockwise
+structurelib.facing.14=down counter clockwise
+structurelib.facing.15=down counter clockwise
+structurelib.facing.16=up normal none
+structurelib.facing.17=up normal horizontal
+structurelib.facing.18=up normal vertical
+structurelib.facing.19=up normal both
+structurelib.facing.20=up clockwise none
+structurelib.facing.21=up clockwise horizontal
+structurelib.facing.22=up clockwise vertical
+structurelib.facing.23=up clockwise both
+structurelib.facing.24=up upside down
+structurelib.facing.25=up upside down
+structurelib.facing.26=up upside down
+structurelib.facing.27=up upside down
+structurelib.facing.28=up counter clockwise
+structurelib.facing.29=up counter clockwise
+structurelib.facing.30=up counter clockwise
+structurelib.facing.31=up counter clockwise
+structurelib.facing.32=north normal none
+structurelib.facing.33=north normal horizontal
+structurelib.facing.34=north normal vertical
+structurelib.facing.35=north normal both
+structurelib.facing.36=north clockwise none
+structurelib.facing.37=north clockwise horizontal
+structurelib.facing.38=north clockwise vertical
+structurelib.facing.39=north clockwise both
+structurelib.facing.40=north upside down
+structurelib.facing.41=north upside down
+structurelib.facing.42=north upside down
+structurelib.facing.43=north upside down
+structurelib.facing.44=north counter clockwise
+structurelib.facing.45=north counter clockwise
+structurelib.facing.46=north counter clockwise
+structurelib.facing.47=north counter clockwise
+structurelib.facing.48=south normal none
+structurelib.facing.49=south normal horizontal
+structurelib.facing.50=south normal vertical
+structurelib.facing.51=south normal both
+structurelib.facing.52=south clockwise none
+structurelib.facing.53=south clockwise horizontal
+structurelib.facing.54=south clockwise vertical
+structurelib.facing.55=south clockwise both
+structurelib.facing.56=south upside down
+structurelib.facing.57=south upside down
+structurelib.facing.58=south upside down
+structurelib.facing.59=south upside down
+structurelib.facing.60=south counter clockwise
+structurelib.facing.61=south counter clockwise
+structurelib.facing.62=south counter clockwise
+structurelib.facing.63=south counter clockwise
+structurelib.facing.64=west normal none
+structurelib.facing.65=west normal horizontal
+structurelib.facing.66=west normal vertical
+structurelib.facing.67=west normal both
+structurelib.facing.68=west clockwise none
+structurelib.facing.69=west clockwise horizontal
+structurelib.facing.70=west clockwise vertical
+structurelib.facing.71=west clockwise both
+structurelib.facing.72=west upside down
+structurelib.facing.73=west upside down
+structurelib.facing.74=west upside down
+structurelib.facing.75=west upside down
+structurelib.facing.76=west counter clockwise
+structurelib.facing.77=west counter clockwise
+structurelib.facing.78=west counter clockwise
+structurelib.facing.79=west counter clockwise
+structurelib.facing.80=east normal none
+structurelib.facing.81=east normal horizontal
+structurelib.facing.82=east normal vertical
+structurelib.facing.83=east normal both
+structurelib.facing.84=east clockwise none
+structurelib.facing.85=east clockwise horizontal
+structurelib.facing.86=east clockwise vertical
+structurelib.facing.87=east clockwise both
+structurelib.facing.88=east upside down
+structurelib.facing.89=east upside down
+structurelib.facing.90=east upside down
+structurelib.facing.91=east upside down
+structurelib.facing.92=east counter clockwise
+structurelib.facing.93=east counter clockwise
+structurelib.facing.94=east counter clockwise
+structurelib.facing.95=east counter clockwise
+
 structurelib.config.client=Client Side Configurations
 structurelib.config.client.tooltip=Configurations that only changes how the game looks like, but not how it functions.
 structurelib.config.client.hologram=Hologram Configurations