From 24504949fc0936fab8df418b8d7e4b9134a55707 Mon Sep 17 00:00:00 2001
From: RemiZOffAlex <remizoffalex@gmail.com>
Date: Sat, 21 Mar 2026 00:50:02 +0300
Subject: [PATCH] =?UTF-8?q?=D0=94=D0=BE=D0=B1=D0=B0=D0=B2=D0=B8=D1=82?=
 =?UTF-8?q?=D1=8C=20executor/visitor.py?=
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---
 executor/visitor.py | 46 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 executor/visitor.py

diff --git a/executor/visitor.py b/executor/visitor.py
new file mode 100644
index 0000000..c7c22ed
--- /dev/null
+++ b/executor/visitor.py
@@ -0,0 +1,46 @@
+__author__ = 'RemiZOffAlex'
+__email__ = 'remizoffalex@mail.ru'
+
+
+class Visitor:
+    def __init__(self, methods: dict = {}):
+        self.__methods = methods
+
+    def register(self, name, handler):
+        self.__methods[name] = handler
+
+    def visit(self, node, *args, **kwargs):
+        if 'kind' in node:
+            name = node['kind']
+        else:
+            raise ValueError('Node is empty')
+        method = self.__methods.get(name, self.__class__.generic_visit)
+        result = method(self, node, *args, **kwargs)
+        return result
+
+    def generic_visit(self, node, *args, **kwargs):
+        """Called if no explicit visitor function exists for a node."""
+        method = node['kind']
+        raise NotImplementedError('No visitor method {method} was defined for this expression: {node}'.format(
+            method=method,
+            node=node
+        ))
+
+    def __getattr__(self, name):
+        raise AttributeError('Вызван несуществующий метод {name}'.format(name=name))
+
+    def __getitem__(self, key):
+        method = self.__methods[key]
+        return method
+
+    def __iter__(self):
+        return iter(self.__methods)
+
+    def __len__(self):
+        return len(self.__methods)
+
+    def __delitem__(self, key):
+        del self.__methods[key]
+
+    def __repr__(self):
+        return repr(self.__methods)