Add abstract function to gd2py

Author: TranquilMarmot

gdtoolkit/gd2py/__init__.py

@@ -64,6 +64,7 @@ def _convert_statement(statement: Tree, context: Context) -> List[str]:
             )
         ],
         "static_func_def": _convert_first_child_as_statement,
+        "abstract_func_def": _convert_abstract_func_def,
         "docstr_stmt": _pass,
         # func statements:
         "func_var_stmt": _convert_first_child_as_statement,
@@ -164,6 +165,16 @@ def _convert_func_def(statement: Tree, context: Context) -> List[str]:
     ] + _convert_block(statement.children[1:], context.create_child_context(-1))
 
 
+def _convert_abstract_func_def(statement: Tree, context: Context) -> List[str]:
+    # Abstract functions don't have a body, so we create a function that raises NotImplementedError
+    func_header = statement.children[0]
+    func_name = func_header.children[0].value
+    return [
+        f"{context.indent_string}def {func_name}():",
+        f"{context.indent_string}    raise NotImplementedError('Abstract method not implemented')",
+    ]
+
+
 def _convert_branch_with_expression(
     prefix: str, statement: Tree, context: Context
 ) -> List[str]: