Multi-module arrangement and the start of AST generation.

README.md

@@ -23,5 +23,5 @@ fn main() {
 ## Usage
 
 ```
-./gradlew -q run --args 'run examples/fib.pork'
+./gradlew -q core:run --args 'run ../examples/fib.pork'
 ```

ast/build.gradle.kts

@@ -0,0 +1,5 @@
+plugins {
+  pork_module
+
+  id("gay.pizza.pork.ast")
+}

ast/src/main/ast/pork.yml

@@ -0,0 +1,38 @@
+root: Node
+types:
+  Expression:
+    parent: Node
+  Symbol:
+    parent: Node
+  Declaration:
+    parent: Node
+  Definition:
+    parent: Node
+    values:
+    - name: symbol
+      type: Symbol
+    - name: modifiers
+      type: DefinitionModifiers
+  DefinitionModifiers:
+    values:
+    - name: export
+      type: Boolean
+  Block:
+    parent: Node
+    values:
+    - name: expressions
+      type: List<Expression>
+  CompilationUnit:
+    parent: Node
+    values:
+    - name: declarations
+      type: List<Declaration>
+    - name: definitions
+      type: List<Declaration>
+  Assignment:
+    parent: Expression
+    values:
+    - name: symbol
+      type: Symbol
+    - name: value
+      type: Expression

ast/src/main/kotlin/gay/pizza/pork/ast/Assignment.kt

@@ -1,7 +1,5 @@
-package gay.pizza.pork.ast.nodes
+package gay.pizza.pork.ast
 
-import gay.pizza.pork.ast.NodeType
-import gay.pizza.pork.ast.NodeVisitor
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 

ast/src/main/kotlin/gay/pizza/pork/ast/Block.kt

@@ -1,7 +1,5 @@
-package gay.pizza.pork.ast.nodes
+package gay.pizza.pork.ast
 
-import gay.pizza.pork.ast.NodeType
-import gay.pizza.pork.ast.NodeVisitor
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 

ast/src/main/kotlin/gay/pizza/pork/ast/BooleanLiteral.kt

@@ -1,6 +1,5 @@
-package gay.pizza.pork.ast.nodes
+package gay.pizza.pork.ast
 
-import gay.pizza.pork.ast.NodeType
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 

ast/src/main/kotlin/gay/pizza/pork/ast/CompilationUnit.kt

@@ -1,7 +1,5 @@
-package gay.pizza.pork.ast.nodes
+package gay.pizza.pork.ast
 
-import gay.pizza.pork.ast.NodeType
-import gay.pizza.pork.ast.NodeVisitor
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 

ast/src/main/kotlin/gay/pizza/pork/ast/Declaration.kt

@@ -1,4 +1,4 @@
-package gay.pizza.pork.ast.nodes
+package gay.pizza.pork.ast
 
 import kotlinx.serialization.Serializable
 

ast/src/main/kotlin/gay/pizza/pork/ast/Definition.kt

@@ -1,4 +1,4 @@
-package gay.pizza.pork.ast.nodes
+package gay.pizza.pork.ast
 
 import kotlinx.serialization.Serializable
 

ast/src/main/kotlin/gay/pizza/pork/ast/DefinitionModifiers.kt

@@ -1,4 +1,4 @@
-package gay.pizza.pork.ast.nodes
+package gay.pizza.pork.ast
 
 import kotlinx.serialization.Serializable
 

ast/src/main/kotlin/gay/pizza/pork/ast/Expression.kt

@@ -1,4 +1,4 @@
-package gay.pizza.pork.ast.nodes
+package gay.pizza.pork.ast
 
 import kotlinx.serialization.Serializable
 

ast/src/main/kotlin/gay/pizza/pork/ast/FunctionCall.kt

@@ -1,7 +1,5 @@
-package gay.pizza.pork.ast.nodes
+package gay.pizza.pork.ast
 
-import gay.pizza.pork.ast.NodeType
-import gay.pizza.pork.ast.NodeVisitor
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 

ast/src/main/kotlin/gay/pizza/pork/ast/FunctionDefinition.kt

@@ -1,7 +1,5 @@
-package gay.pizza.pork.ast.nodes
+package gay.pizza.pork.ast
 
-import gay.pizza.pork.ast.NodeType
-import gay.pizza.pork.ast.NodeVisitor
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 

ast/src/main/kotlin/gay/pizza/pork/ast/If.kt

@@ -1,7 +1,5 @@
-package gay.pizza.pork.ast.nodes
+package gay.pizza.pork.ast
 
-import gay.pizza.pork.ast.NodeType
-import gay.pizza.pork.ast.NodeVisitor
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 

ast/src/main/kotlin/gay/pizza/pork/ast/ImportDeclaration.kt

@@ -1,7 +1,5 @@
-package gay.pizza.pork.ast.nodes
+package gay.pizza.pork.ast
 
-import gay.pizza.pork.ast.NodeType
-import gay.pizza.pork.ast.NodeVisitor
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 

ast/src/main/kotlin/gay/pizza/pork/ast/InfixOperation.kt

@@ -1,7 +1,5 @@
-package gay.pizza.pork.ast.nodes
+package gay.pizza.pork.ast
 
-import gay.pizza.pork.ast.NodeType
-import gay.pizza.pork.ast.NodeVisitor
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 

ast/src/main/kotlin/gay/pizza/pork/ast/InfixOperator.kt

@@ -1,4 +1,4 @@
-package gay.pizza.pork.ast.nodes
+package gay.pizza.pork.ast
 
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable

ast/src/main/kotlin/gay/pizza/pork/ast/IntLiteral.kt

@@ -1,6 +1,5 @@
-package gay.pizza.pork.ast.nodes
+package gay.pizza.pork.ast
 
-import gay.pizza.pork.ast.NodeType
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 

ast/src/main/kotlin/gay/pizza/pork/ast/Lambda.kt

@@ -1,7 +1,5 @@
-package gay.pizza.pork.ast.nodes
+package gay.pizza.pork.ast
 
-import gay.pizza.pork.ast.NodeType
-import gay.pizza.pork.ast.NodeVisitor
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 

ast/src/main/kotlin/gay/pizza/pork/ast/ListLiteral.kt

@@ -1,7 +1,5 @@
-package gay.pizza.pork.ast.nodes
+package gay.pizza.pork.ast
 
-import gay.pizza.pork.ast.NodeType
-import gay.pizza.pork.ast.NodeVisitor
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 

ast/src/main/kotlin/gay/pizza/pork/ast/Node.kt

@@ -0,0 +1,9 @@
+package gay.pizza.pork.ast
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+sealed class Node {
+  abstract val type: NodeType
+  open fun <T> visitChildren(visitor: NodeVisitor<T>): List<T> = emptyList()
+}

ast/src/main/kotlin/gay/pizza/pork/ast/NodeCoalescer.kt

@@ -1,7 +1,5 @@
 package gay.pizza.pork.ast
 
-import gay.pizza.pork.ast.nodes.*
-
 class NodeCoalescer(val handler: (Node) -> Unit) : NodeVisitor<Unit> {
   override fun visitIntLiteral(node: IntLiteral): Unit = handle(node)
   override fun visitStringLiteral(node: StringLiteral): Unit = handle(node)

ast/src/main/kotlin/gay/pizza/pork/ast/NodeVisitor.kt

@@ -1,7 +1,5 @@
 package gay.pizza.pork.ast
 
-import gay.pizza.pork.ast.nodes.*
-
 interface NodeVisitor<T> {
   fun visitIntLiteral(node: IntLiteral): T
   fun visitStringLiteral(node: StringLiteral): T

ast/src/main/kotlin/gay/pizza/pork/ast/Parentheses.kt

@@ -1,7 +1,5 @@
-package gay.pizza.pork.ast.nodes
+package gay.pizza.pork.ast
 
-import gay.pizza.pork.ast.NodeType
-import gay.pizza.pork.ast.NodeVisitor
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 

ast/src/main/kotlin/gay/pizza/pork/ast/PrefixOperation.kt

@@ -1,7 +1,5 @@
-package gay.pizza.pork.ast.nodes
+package gay.pizza.pork.ast
 
-import gay.pizza.pork.ast.NodeType
-import gay.pizza.pork.ast.NodeVisitor
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 

ast/src/main/kotlin/gay/pizza/pork/ast/PrefixOperator.kt

@@ -1,4 +1,4 @@
-package gay.pizza.pork.ast.nodes
+package gay.pizza.pork.ast
 
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable

ast/src/main/kotlin/gay/pizza/pork/ast/StringLiteral.kt

@@ -1,6 +1,5 @@
-package gay.pizza.pork.ast.nodes
+package gay.pizza.pork.ast
 
-import gay.pizza.pork.ast.NodeType
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 

ast/src/main/kotlin/gay/pizza/pork/ast/Symbol.kt

@@ -1,6 +1,5 @@
-package gay.pizza.pork.ast.nodes
+package gay.pizza.pork.ast
 
-import gay.pizza.pork.ast.NodeType
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 

ast/src/main/kotlin/gay/pizza/pork/ast/SymbolReference.kt

@@ -1,7 +1,5 @@
-package gay.pizza.pork.ast.nodes
+package gay.pizza.pork.ast
 
-import gay.pizza.pork.ast.NodeType
-import gay.pizza.pork.ast.NodeVisitor
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 

build.gradle.kts

@@ -1,51 +1,3 @@
-import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
-
-plugins {
-  application
-
-  kotlin("jvm") version "1.9.10"
-  kotlin("plugin.serialization") version "1.9.10"
-
-  id("com.github.johnrengelman.shadow") version "8.1.1"
-  id("org.graalvm.buildtools.native") version "0.9.25"
-}
-
-repositories {
-  mavenCentral()
-}
-
-java {
-  val javaVersion = JavaVersion.toVersion(17)
-  sourceCompatibility = javaVersion
-  targetCompatibility = javaVersion
-}
-
-dependencies {
-  implementation("org.jetbrains.kotlin:kotlin-bom")
-  implementation("com.github.ajalt.clikt:clikt:4.2.0")
-  implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.6.0")
-}
-
-tasks.withType<KotlinCompile> {
-  kotlinOptions.jvmTarget = "17"
-}
-
 tasks.withType<Wrapper> {
   gradleVersion = "8.3"
 }
-
-application {
-  mainClass.set("gay.pizza.pork.cli.MainKt")
-}
-
-graalvmNative {
-  binaries {
-    named("main") {
-      imageName.set("pork")
-      mainClass.set("gay.pizza.pork.cli.MainKt")
-      sharedLibrary.set(false)
-    }
-  }
-}
-
-tasks.run.get().outputs.upToDateWhen { false }

buildSrc/build.gradle.kts

@@ -0,0 +1,29 @@
+plugins {
+  `kotlin-dsl`
+}
+
+repositories {
+  mavenCentral()
+  gradlePluginPortal()
+}
+
+dependencies {
+  implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.10")
+  implementation("org.jetbrains.kotlin:kotlin-serialization:1.9.10")
+
+  implementation("com.fasterxml.jackson.core:jackson-databind:2.15.2")
+  implementation("com.fasterxml.jackson.module:jackson-module-kotlin:2.15.2")
+  implementation("com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:2.15.2")
+}
+
+gradlePlugin {
+  plugins {
+    create("pork_ast") {
+      id = "gay.pizza.pork.ast"
+      implementationClass = "gay.pizza.pork.gradle.PorkAstPlugin"
+
+      displayName = "Pork AST"
+      description = "AST generation code for pork"
+    }
+  }
+}

buildSrc/src/main/kotlin/gay/pizza/pork/gradle/GenerateAstCode.kt

@@ -0,0 +1,30 @@
+package gay.pizza.pork.gradle
+
+import com.fasterxml.jackson.databind.ObjectMapper
+import com.fasterxml.jackson.dataformat.yaml.YAMLFactory
+import com.fasterxml.jackson.module.kotlin.KotlinModule
+import gay.pizza.pork.gradle.ast.AstDescription
+import org.gradle.api.DefaultTask
+import org.gradle.api.tasks.InputFile
+import org.gradle.api.tasks.TaskAction
+import gay.pizza.pork.gradle.ast.AstWorld
+import java.io.File
+
+open class GenerateAstCode : DefaultTask() {
+  init {
+    outputs.upToDateWhen { false }
+  }
+
+  @get:InputFile
+  val astDescriptionFile: File = project.file("src/main/ast/pork.yml")
+
+  @TaskAction
+  fun generate() {
+    val astYamlText = astDescriptionFile.readText()
+    val mapper = ObjectMapper(YAMLFactory())
+    mapper.registerModules(KotlinModule.Builder().build())
+    val astDescription = mapper.readValue(astYamlText, AstDescription::class.java)
+    val world = AstWorld()
+    world.build(astDescription)
+  }
+}

buildSrc/src/main/kotlin/gay/pizza/pork/gradle/PorkAstPlugin.kt

@@ -0,0 +1,10 @@
+package gay.pizza.pork.gradle
+
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+
+class PorkAstPlugin : Plugin<Project> {
+  override fun apply(target: Project) {
+    target.tasks.create("generateAstCode", GenerateAstCode::class.java)
+  }
+}

buildSrc/src/main/kotlin/gay/pizza/pork/gradle/ast/AstDescription.kt

@@ -0,0 +1,6 @@
+package gay.pizza.pork.gradle.ast
+
+data class AstDescription(
+  val root: String,
+  val types: Map<String, AstTypeDescription>
+)

buildSrc/src/main/kotlin/gay/pizza/pork/gradle/ast/AstPrimitive.kt

@@ -0,0 +1,6 @@
+package gay.pizza.pork.gradle.ast
+
+enum class AstPrimitive(val id: kotlin.String) {
+  Boolean("Boolean"),
+  String("String")
+}

buildSrc/src/main/kotlin/gay/pizza/pork/gradle/ast/AstType.kt

@@ -0,0 +1,12 @@
+package gay.pizza.pork.gradle.ast
+
+class AstType(val name: String, var parent: AstType? = null) {
+  private val internalValues = mutableListOf<AstValue>()
+
+  val values: List<AstValue>
+    get() = internalValues
+
+  internal fun addValue(value: AstValue) {
+    internalValues.add(value)
+  }
+}

buildSrc/src/main/kotlin/gay/pizza/pork/gradle/ast/AstTypeDescription.kt

@@ -0,0 +1,6 @@
+package gay.pizza.pork.gradle.ast
+
+data class AstTypeDescription(
+  val parent: String? = null,
+  val values: List<AstValueDescription> = emptyList()
+)

buildSrc/src/main/kotlin/gay/pizza/pork/gradle/ast/AstTypeRef.kt

@@ -0,0 +1,31 @@
+package gay.pizza.pork.gradle.ast
+
+class AstTypeRef(
+  val type: AstType? = null,
+  val primitive: AstPrimitive? = null,
+  val form: AstTypeRefForm
+) {
+  companion object {
+    fun parse(input: String, registry: AstTypeRegistry): AstTypeRef {
+      if (input.startsWith("List<")) {
+        val underlyingType = input.substring(5, input.length - 1)
+        val underlyingRef = parse(underlyingType, registry)
+        return AstTypeRef(
+          type = underlyingRef.type,
+          primitive = underlyingRef.primitive,
+          form = AstTypeRefForm.List
+        )
+      }
+
+      val primitive = AstPrimitive.values().firstOrNull { it.name == input }
+      if (primitive != null) {
+        return AstTypeRef(
+          primitive = primitive,
+          form = AstTypeRefForm.Single
+        )
+      }
+
+      return AstTypeRef(type = registry.lookup(input), form = AstTypeRefForm.Single)
+    }
+  }
+}

buildSrc/src/main/kotlin/gay/pizza/pork/gradle/ast/AstTypeRefForm.kt

@@ -0,0 +1,6 @@
+package gay.pizza.pork.gradle.ast
+
+enum class AstTypeRefForm {
+  Single,
+  List
+}

buildSrc/src/main/kotlin/gay/pizza/pork/gradle/ast/AstTypeRegistry.kt

@@ -0,0 +1,32 @@
+package gay.pizza.pork.gradle.ast
+
+class AstTypeRegistry {
+  private val internalTypes = mutableSetOf<AstType>()
+
+  val types: Set<AstType>
+    get() = internalTypes
+
+  fun add(type: AstType): AstType {
+    internalTypes.add(type)
+    return type
+  }
+
+  fun lookupOrNull(name: String): AstType? =
+    internalTypes.singleOrNull { it.name == name }
+
+  fun lookup(name: String): AstType = lookupOrNull(name)
+    ?: throw RuntimeException("Unknown AstType: $name")
+
+  fun roleOfType(type: AstType): AstTypeRole =
+    when {
+      type.parent == null && type.values.isNotEmpty() ->
+        AstTypeRole.RootNode
+      type.parent != null && type.values.all { it.abstract } ->
+        AstTypeRole.HierarchyNode
+      type.parent != null && type.values.none { it.abstract } ->
+        AstTypeRole.AstNode
+      type.parent == null && type.values.isNotEmpty() ->
+        AstTypeRole.ValueHolder
+      else -> throw RuntimeException("Unable to determine role of type ${type.name}")
+  }
+}

buildSrc/src/main/kotlin/gay/pizza/pork/gradle/ast/AstTypeRole.kt

@@ -0,0 +1,8 @@
+package gay.pizza.pork.gradle.ast
+
+enum class AstTypeRole {
+  RootNode,
+  HierarchyNode,
+  AstNode,
+  ValueHolder
+}

buildSrc/src/main/kotlin/gay/pizza/pork/gradle/ast/AstValue.kt

@@ -0,0 +1,7 @@
+package gay.pizza.pork.gradle.ast
+
+class AstValue(
+  val name: String,
+  val typeRef: AstTypeRef,
+  val abstract: Boolean = false
+)

buildSrc/src/main/kotlin/gay/pizza/pork/gradle/ast/AstValueDescription.kt

@@ -0,0 +1,6 @@
+package gay.pizza.pork.gradle.ast
+
+data class AstValueDescription(
+  val name: String,
+  val type: String
+)

buildSrc/src/main/kotlin/gay/pizza/pork/gradle/ast/AstWorld.kt

@@ -0,0 +1,28 @@
+package gay.pizza.pork.gradle.ast
+
+class AstWorld {
+  val typeRegistry: AstTypeRegistry = AstTypeRegistry()
+
+  fun build(description: AstDescription) {
+    val rootType = typeRegistry.add(AstType(description.root))
+    for (typeName in description.types.keys) {
+      if (typeName == rootType.name) {
+        throw RuntimeException("Cannot have type with the same name as the root type.")
+      }
+
+      typeRegistry.add(AstType(typeName))
+    }
+
+    for ((typeName, typeDescription) in description.types) {
+      val type = typeRegistry.lookup(typeName)
+      if (typeDescription.parent != null) {
+        type.parent = typeRegistry.lookup(typeDescription.parent)
+      }
+      for (value in typeDescription.values) {
+        val typeRef = AstTypeRef.parse(value.type, typeRegistry)
+        val typeValue = AstValue(value.name, typeRef)
+        type.addValue(typeValue)
+      }
+    }
+  }
+}

buildSrc/src/main/kotlin/pork_module.gradle.kts

@@ -0,0 +1,25 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+plugins {
+  kotlin("jvm")
+  kotlin("plugin.serialization")
+}
+
+repositories {
+  mavenCentral()
+}
+
+java {
+  val javaVersion = JavaVersion.toVersion(17)
+  sourceCompatibility = javaVersion
+  targetCompatibility = javaVersion
+}
+
+tasks.withType<KotlinCompile> {
+  kotlinOptions.jvmTarget = "17"
+}
+
+dependencies {
+  implementation("org.jetbrains.kotlin:kotlin-bom")
+  implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.6.0")
+}

core/build.gradle.kts

@@ -0,0 +1,27 @@
+plugins {
+  application
+  pork_module
+  id("com.github.johnrengelman.shadow") version "8.1.1"
+  id("org.graalvm.buildtools.native") version "0.9.25"
+}
+
+dependencies {
+  api(project(":ast"))
+  implementation(libs.clikt)
+}
+
+application {
+  mainClass.set("gay.pizza.pork.cli.MainKt")
+}
+
+graalvmNative {
+  binaries {
+    named("main") {
+      imageName.set("pork")
+      mainClass.set("gay.pizza.pork.cli.MainKt")
+      sharedLibrary.set(false)
+    }
+  }
+}
+
+tasks.run.get().outputs.upToDateWhen { false }

core/src/main/kotlin/gay/pizza/pork/cli/AstCommand.kt

@@ -3,7 +3,7 @@ package gay.pizza.pork.cli
 import com.github.ajalt.clikt.core.CliktCommand
 import com.github.ajalt.clikt.parameters.arguments.argument
 import com.github.ajalt.clikt.parameters.types.path
-import gay.pizza.pork.ast.nodes.Node
+import gay.pizza.pork.ast.Node
 import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.json.Json
 

core/src/main/kotlin/gay/pizza/pork/cli/Tool.kt

@@ -1,8 +1,8 @@
 package gay.pizza.pork.cli
 
 import gay.pizza.pork.ast.NodeVisitor
-import gay.pizza.pork.ast.Printer
-import gay.pizza.pork.ast.nodes.CompilationUnit
+import gay.pizza.pork.parse.Printer
+import gay.pizza.pork.ast.CompilationUnit
 import gay.pizza.pork.eval.*
 import gay.pizza.pork.frontend.ContentSource
 import gay.pizza.pork.frontend.World

core/src/main/kotlin/gay/pizza/pork/eval/EvaluationContext.kt

@@ -1,7 +1,7 @@
 package gay.pizza.pork.eval
 
-import gay.pizza.pork.ast.nodes.CompilationUnit
-import gay.pizza.pork.ast.nodes.ImportDeclaration
+import gay.pizza.pork.ast.CompilationUnit
+import gay.pizza.pork.ast.ImportDeclaration
 
 class EvaluationContext(
   val compilationUnit: CompilationUnit,

core/src/main/kotlin/gay/pizza/pork/eval/EvaluationVisitor.kt

@@ -1,7 +1,6 @@
 package gay.pizza.pork.eval
 
-import gay.pizza.pork.ast.NodeVisitor
-import gay.pizza.pork.ast.nodes.*
+import gay.pizza.pork.ast.*
 
 class EvaluationVisitor(root: Scope) : NodeVisitor<Any> {
   private var currentScope: Scope = root
@@ -65,7 +64,7 @@ class EvaluationVisitor(root: Scope) : NodeVisitor<Any> {
       visit(node.thenExpression)
     } else {
       if (node.elseExpression != null) {
-        visit(node.elseExpression)
+        visit(node.elseExpression!!)
       } else {
         None
       }

core/src/main/kotlin/gay/pizza/pork/frontend/World.kt

@@ -1,7 +1,7 @@
 package gay.pizza.pork.frontend
 
-import gay.pizza.pork.ast.nodes.CompilationUnit
-import gay.pizza.pork.ast.nodes.ImportDeclaration
+import gay.pizza.pork.ast.CompilationUnit
+import gay.pizza.pork.ast.ImportDeclaration
 import gay.pizza.pork.parse.DiscardNodeAttribution
 import gay.pizza.pork.parse.Parser
 import gay.pizza.pork.parse.TokenStreamSource

core/src/main/kotlin/gay/pizza/pork/parse/DiscardNodeAttribution.kt

@@ -1,6 +1,6 @@
 package gay.pizza.pork.parse
 
-import gay.pizza.pork.ast.nodes.Node
+import gay.pizza.pork.ast.Node
 
 object DiscardNodeAttribution : NodeAttribution {
   override fun enter() {}

core/src/main/kotlin/gay/pizza/pork/parse/NodeAttribution.kt

@@ -1,6 +1,6 @@
 package gay.pizza.pork.parse
 
-import gay.pizza.pork.ast.nodes.Node
+import gay.pizza.pork.ast.Node
 
 interface NodeAttribution {
   fun enter()

core/src/main/kotlin/gay/pizza/pork/parse/Parser.kt

@@ -1,6 +1,6 @@
 package gay.pizza.pork.parse
 
-import gay.pizza.pork.ast.nodes.*
+import gay.pizza.pork.ast.*
 import gay.pizza.pork.util.StringEscape
 
 class Parser(source: PeekableSource<Token>, val attribution: NodeAttribution) {

core/src/main/kotlin/gay/pizza/pork/parse/Printer.kt

@@ -1,6 +1,6 @@
-package gay.pizza.pork.ast
+package gay.pizza.pork.parse
 
-import gay.pizza.pork.ast.nodes.*
+import gay.pizza.pork.ast.*
 import gay.pizza.pork.util.IndentPrinter
 import gay.pizza.pork.util.StringEscape
 
@@ -134,7 +134,7 @@ class Printer(buffer: StringBuilder) : NodeVisitor<Unit> {
       append("else")
       out.increaseIndent()
       appendLine()
-      visit(node.elseExpression)
+      visit(node.elseExpression!!)
       out.decreaseIndent()
     }
   }

core/src/main/kotlin/gay/pizza/pork/parse/TokenNodeAttribution.kt

@@ -1,7 +1,7 @@
 package gay.pizza.pork.parse
 
 import gay.pizza.pork.ast.NodeCoalescer
-import gay.pizza.pork.ast.nodes.Node
+import gay.pizza.pork.ast.Node
 import java.util.IdentityHashMap
 
 class TokenNodeAttribution : NodeAttribution {

settings.gradle.kts

@@ -1 +1,17 @@
 rootProject.name = "pork"
+
+include(
+  ":ast",
+  ":core"
+)
+
+dependencyResolutionManagement {
+  versionCatalogs {
+    create("libs") {
+      version("clikt", "4.2.0")
+
+      library("clikt", "com.github.ajalt.clikt", "clikt")
+        .versionRef("clikt")
+    }
+  }
+}

src/main/kotlin/gay/pizza/pork/ast/nodes/Node.kt

@@ -1,15 +0,0 @@
-package gay.pizza.pork.ast.nodes
-
-import gay.pizza.pork.ast.NodeType
-import gay.pizza.pork.ast.Printer
-import gay.pizza.pork.ast.NodeVisitor
-import kotlinx.serialization.Serializable
-
-@Serializable
-sealed class Node {
-  abstract val type: NodeType
-  open fun <T> visitChildren(visitor: NodeVisitor<T>): List<T> = emptyList()
-
-  override fun toString(): String =
-    let { node -> buildString { Printer(this).visit(node) } }
-}