Implement AST Observer and AST printer

src/codegen/PrintObserver.cpp

@@ -0,0 +1,23 @@
+//
+// Created by christoph on 21.03.23.
+//
+
+#include <iostream>
+#include "PrintObserver.h"
+
+PrintObserver::PrintObserver(const Node &node) : PrefixObserver(node) {}
+
+void PrintObserver::action(const Node &node) {
+    // Print a simple indent guide
+    std::string depth_padding(depth * 2, '|');
+    if (depth > 0) {
+        for (uint32_t i = 0; i < depth_padding.length(); ++i) {
+            if (i % 2 == 1) {
+                depth_padding[i] = ' ';
+            }
+        }
+        depth_padding[(depth * 2) - 1] = '-';
+    }
+
+    std::cout << depth_padding << typeid(node).name() << std::endl;
+}

src/codegen/PrintObserver.h

@@ -0,0 +1,20 @@
+//
+// Created by christoph on 21.03.23.
+//
+
+#ifndef LOGISIMASSEMBLER_PRINTOBSERVER_H
+#define LOGISIMASSEMBLER_PRINTOBSERVER_H
+
+#include "../ast/PrefixObserver.h"
+
+class PrintObserver : public PrefixObserver {
+public:
+    PrintObserver(const Node &node);
+
+    ~PrintObserver() override = default;
+
+protected:
+    void action(const Node &node) override;
+};
+
+#endif //LOGISIMASSEMBLER_PRINTOBSERVER_H