Refactor processor API and add Axis/BlockFace processors

Refactored `findProcessorForState` to an extension function on `TargetState` for improved readability and consistency. Introduced `AxisPreprocessor` and `BlockFaceProcessor` to handle preprocessing based on block axis and block face properties, enhancing placement flexibility and processing logic.

Author: Avanatiker

common/src/main/kotlin/com/lambda/interaction/construction/processing/ProcessorRegistry.kt

@@ -28,8 +28,8 @@ object ProcessorRegistry : Loadable {
     private val processors = getInstances<PlacementProcessor> { forPackages(PROCESSOR_PACKAGE) }
     private val processorCache = mutableMapOf<BlockState, PreprocessingStep>()
 
-    fun findProcessorForState(target: TargetState): PreprocessingStep =
-        (target as? TargetState.State)?.let { state ->
+    fun TargetState.findProcessorForState(): PreprocessingStep =
+        (this as? TargetState.State)?.let { state ->
             processorCache.getOrPut(state.blockState) {
                 (processors.find { it.acceptState(state.blockState) } ?: DefaultProcessor).preProcess(state.blockState)
             }

common/src/main/kotlin/com/lambda/interaction/construction/processing/processors/AxisPreprocessor.kt

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2024 Lambda
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.lambda.interaction.construction.processing.processors
+
+import com.lambda.interaction.construction.processing.PlacementProcessor
+import com.lambda.interaction.construction.processing.PreprocessingStep
+import net.minecraft.block.BlockState
+import net.minecraft.state.property.Properties
+import net.minecraft.util.math.Direction
+
+object AxisPreprocessor : PlacementProcessor() {
+    override fun acceptState(state: BlockState) =
+        state.getOrEmpty(Properties.AXIS).isPresent
+
+    override fun preProcess(state: BlockState): PreprocessingStep {
+        val axis = state.getOrEmpty(Properties.AXIS).get()
+        return PreprocessingStep(
+            sides = Direction.entries.filter { it.axis == axis }.toSet()
+        )
+    }
+}

common/src/main/kotlin/com/lambda/interaction/construction/processing/processors/BlockFaceProcessor.kt

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2024 Lambda
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.lambda.interaction.construction.processing.processors
+
+import com.lambda.interaction.construction.processing.PlacementProcessor
+import com.lambda.interaction.construction.processing.PreprocessingStep
+import net.minecraft.block.BlockState
+import net.minecraft.block.enums.BlockFace
+import net.minecraft.state.property.Properties
+import net.minecraft.util.math.Direction
+import kotlin.jvm.optionals.getOrNull
+
+object BlockFaceProcessor : PlacementProcessor() {
+    override fun acceptState(state: BlockState) =
+        state.getOrEmpty(Properties.BLOCK_FACE).isPresent
+
+    override fun preProcess(state: BlockState): PreprocessingStep {
+        val property = state.getOrEmpty(Properties.BLOCK_FACE).getOrNull() ?: return PreprocessingStep()
+        val sides = when (property) {
+            BlockFace.FLOOR -> setOf(Direction.DOWN)
+            BlockFace.CEILING -> setOf(Direction.UP)
+            BlockFace.WALL -> Direction.Type.HORIZONTAL.stream().toList().toSet()
+        }
+        return PreprocessingStep(sides = sides)
+    }
+}