Enhanced.

rpn/src/main/java/com/soebes/rpn/grammar/ExpressionVisitor.java

@@ -49,16 +49,16 @@ public Programm visitGRPUNARY(ExprParser.GRPUNARYContext ctx) {
 
   @Override
   public Programm visitComplexVector(ExprParser.ComplexVectorContext ctx) {
-    ctx.complex().stream().forEach(s -> System.out.println(
+    ctx.complex().forEach(s -> System.out.println(
         "s.realPart() = {" + s.realPart().getText() + " " + s.imagPart().getText() + "}"));
     super.visitComplexVector(ctx);
     return null;
   }
 
   @Override
   public Programm visitRealVector(ExprParser.RealVectorContext ctx) {
-    ctx.REAL().stream().forEach(s -> System.out.println("s.() = {" + s.getText() + "}"));
-    ctx.REAL().stream().forEach(s -> System.out.println("s.getText() = " + s.getSymbol()));
+    ctx.REAL().forEach(s -> System.out.println("s.() = {" + s.getText() + "}"));
+    ctx.REAL().forEach(s -> System.out.println("s.getText() = " + s.getSymbol()));
     System.out.println("ctx = " + ctx.REAL());
     super.visitRealVector(ctx);
     return null;

rpn/src/test/java/com/soebes/rpn/grammar/ExpressionVisitorTest.java

@@ -37,7 +37,7 @@ class ExpressionVisitorTest {
   static Stream<Arguments> createExpressionToParse() {
     return Stream.of(
 //        arguments("Real", "3.13", 3.13)
-//        arguments("Complex", "(3.13,1.0)", 3.13)
+        arguments("Complex", "(3.13,1.0)", 3.13),
         arguments("Real Vector", "[1 2 3 4]", 3.13)
 //        arguments("Complex Vector", "[(1,0) (2,0) (3,0) (4,0)]", 3.13)
     );

simple-expression/ast/src/main/java/com/soebes/expression/ast/BinaryExpression.java

@@ -1,21 +1,5 @@
 package com.soebes.expression.ast;
 
 public record BinaryExpression(Operator operator, Expression left, Expression right) implements Expression {
-  public enum Operator {
-    ADD("+"),
-    SUB("-"),
-    MUL("*"),
-    DIV("/");
-    private final String value;
-
-    Operator(String value) {
-      this.value = value;
-    }
-
-    @Override
-    public String toString() {
-      return value;
-    }
-  }
 
 }

simple-expression/ast/src/main/java/com/soebes/expression/ast/Operator.java

@@ -0,0 +1,18 @@
+package com.soebes.expression.ast;
+
+public enum Operator {
+  ADD("+"),
+  SUB("-"),
+  MUL("*"),
+  DIV("/");
+  private final String value;
+
+  Operator(String value) {
+    this.value = value;
+  }
+
+  @Override
+  public String toString() {
+    return value;
+  }
+}

simple-expression/expression/src/main/java/com/soebes/expression/grammar/ExpressionVisitor.java

@@ -24,10 +24,10 @@
 import com.soebes.expression.ast.Expression;
 import org.antlr.v4.runtime.Token;
 
-import static com.soebes.expression.ast.BinaryExpression.Operator.ADD;
-import static com.soebes.expression.ast.BinaryExpression.Operator.DIV;
-import static com.soebes.expression.ast.BinaryExpression.Operator.MUL;
-import static com.soebes.expression.ast.BinaryExpression.Operator.SUB;
+import static com.soebes.expression.ast.Operator.ADD;
+import static com.soebes.expression.ast.Operator.DIV;
+import static com.soebes.expression.ast.Operator.MUL;
+import static com.soebes.expression.ast.Operator.SUB;
 
 public class ExpressionVisitor extends SimpleExpressionBaseVisitor<Expression> {
 

simple-expression/expression/src/test/java/com/soebes/expression/grammar/ExpressionVisitorTest.java

@@ -30,10 +30,10 @@
 
 import java.util.stream.Stream;
 
-import static com.soebes.expression.ast.BinaryExpression.Operator.ADD;
-import static com.soebes.expression.ast.BinaryExpression.Operator.DIV;
-import static com.soebes.expression.ast.BinaryExpression.Operator.MUL;
-import static com.soebes.expression.ast.BinaryExpression.Operator.SUB;
+import static com.soebes.expression.ast.Operator.ADD;
+import static com.soebes.expression.ast.Operator.DIV;
+import static com.soebes.expression.ast.Operator.MUL;
+import static com.soebes.expression.ast.Operator.SUB;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.params.provider.Arguments.arguments;
 

simple-expression/runtime/src/test/java/com/soebes/expression/runtime/RuntimeTest.java

@@ -29,10 +29,10 @@
 
 import java.util.stream.Stream;
 
-import static com.soebes.expression.ast.BinaryExpression.Operator.ADD;
-import static com.soebes.expression.ast.BinaryExpression.Operator.DIV;
-import static com.soebes.expression.ast.BinaryExpression.Operator.MUL;
-import static com.soebes.expression.ast.BinaryExpression.Operator.SUB;
+import static com.soebes.expression.ast.Operator.ADD;
+import static com.soebes.expression.ast.Operator.DIV;
+import static com.soebes.expression.ast.Operator.MUL;
+import static com.soebes.expression.ast.Operator.SUB;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.params.provider.Arguments.arguments;