[PoC] Generate IR definitions with annotation processor

engine/runtime-parser-processor/src/main/java/org/enso/runtime/parser/processor/MapExpressionsMethodGenerator.java

@@ -1,7 +1,9 @@
 package org.enso.runtime.parser.processor;
 
 import java.util.Objects;
+import javax.lang.model.element.Element;
 import javax.lang.model.element.ExecutableElement;
+import javax.lang.model.element.TypeElement;
 
 final class MapExpressionsMethodGenerator {
   private final ExecutableElement mapExpressionsMethod;
@@ -58,7 +60,7 @@ String generateMapExpressionsMethodCode() {
 
               var newChildName = child.getName() + "Mapped";
               sb.append("  ")
-                  .append(childsMapExprMethodRetType.getSimpleName())
+                  .append(typeName(childsMapExprMethodRetType))
                   .append(" ")
                   .append(newChildName);
               if (child.isNullable()) {
@@ -128,5 +130,12 @@ String generateMapExpressionsMethodCode() {
     return sb.toString();
   }
 
+  private String typeName(Element element) {
+    if (element instanceof TypeElement typeElement) {
+      return typeElement.getQualifiedName().toString();
+    }
+    return element.getSimpleName().toString();
+  }
+
   private record MappedChild(String newChildName, Field child, boolean shouldCast) {}
 }

engine/runtime-parser/src/main/java/org/enso/compiler/core/ir/JExpression.java

@@ -1,12 +1,27 @@
 package org.enso.compiler.core.ir;
 
+import java.util.function.Function;
 import org.enso.compiler.core.IR;
+import org.enso.compiler.core.ir.JExpressionGen.IfThenElseGen;
 import org.enso.runtime.parser.dsl.IRChild;
+import org.enso.runtime.parser.dsl.IRCopyMethod;
 import org.enso.runtime.parser.dsl.IRNode;
+import scala.Option;
 import scala.collection.immutable.List;
 
 @IRNode
 public interface JExpression extends IR {
+
+  @Override
+  JExpression mapExpressions(Function<Expression, Expression> fn);
+
+  @Override
+  JExpression duplicate(
+      boolean keepLocations,
+      boolean keepMetadata,
+      boolean keepDiagnostics,
+      boolean keepIdentifiers);
+
   interface JBlock extends JExpression {
     @IRChild
     List<JExpression> expressions();

engine/runtime-parser/src/main/java/org/enso/compiler/core/ir/JName.java

@@ -1,5 +1,6 @@
 package org.enso.compiler.core.ir;
 
+import org.enso.compiler.core.ir.JNameGen.JBlankGen;
 import org.enso.compiler.core.ir.module.scope.JDefinition;
 import org.enso.runtime.parser.dsl.IRChild;
 import org.enso.runtime.parser.dsl.IRNode;
@@ -18,7 +19,11 @@ JName duplicate(
       boolean keepDiagnostics,
       boolean keepIdentifiers);
 
-  interface JBlank extends JName {}
+  interface JBlank extends JName {
+    static JBlank create() {
+      return JBlankGen.builder().build();
+    }
+  }
 
   interface JLiteral extends JName {
     @IRChild(required = false)