Set up visitor (#3)

Co-authored-by: geno <gabriele.genovese2@studio.unibo.it>

1 files changed, 36 insertions, 0 deletions

diff --git a/src/ast/nodes/Node.java b/src/ast/nodes/Node.java
new file mode 100644
index 0000000..f807745
--- /dev/null
+++ b/src/ast/nodes/Node.java
@@ -0,0 +1,36 @@
+package com.clp.project.ast.nodes;
+
+import java.util.ArrayList;
+
+import com.clp.project.semanticanalysis.SemanticError;
+import com.clp.project.semanticanalysis.SymbolTable;
+import com.clp.project.ast.types.*;
+
+/**
+ * Base interface for a Node.
+ */
+public interface Node {
+    /**
+     * Checks semantics for a given node for a SymbolTable ST and a level of
+     * nesting.
+     * Returns a list of `SemanticError`.
+     */
+    ArrayList<SemanticError> checkSemantics(SymbolTable ST, int _nesting);
+
+    /**
+     * Checks the type for a given node. If there's any error, returns an
+     * `ErrorType`.
+     */
+    Type typeCheck();
+
+    /**
+     * Returns a string for the Python Virtual Machine.
+     */
+    String codeGeneration();
+
+    /**
+     * Returns a string for a given node with a prefix.
+     * It used when an AST wants to be visualized on screen.
+     */
+    String toPrint(String prefix);
+}