Добавить executor/engine.py

executor/engine.py

@@ -0,0 +1,99 @@
+__author__ = 'RemiZOffAlex'
+__email__ = 'remizoffalex@mail.ru'
+
+
+class Engine:
+    def __init__(self):
+        self.__methods = {}
+        self.debug = False
+        self.stack = []
+        self.scopes = {'root': {}}
+        self.scope = 'root'
+
+    def register(self, name, handler):
+        self.__methods[name] = handler
+
+    def visit(self, node):
+        method = node['kind']
+        visitor = self.__methods.get(method, self.__class__.generic_visit)
+        result = visitor(self, node)
+        return result
+
+    def generic_visit(self, node):
+        """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 variable_addition(self, name, value = None):
+        current = self.scopes[self.scope]
+        if name in current:
+            raise Exception('Double declaration of the variable %s' % name)
+        current[name] = value
+
+
+    def variable_delete(self, name, value):
+        current = self.scopes[self.scope]
+        if name in current:
+            del current[name]
+        raise Exception('Переменная {} не найдена'.format(name))
+
+
+    def variable_exist(self, name):
+        current = self.scopes[self.scope]
+        return name in current
+
+
+    def variable_get(self, name):
+        scope = self.scopes[self.scope]
+        if name in scope:
+            result = scope[name]
+            return result
+        stack = []
+        if self.scope != 'root':
+            stack.append(self.scope)
+        while len(stack) > 0:
+            scope_name = stack.pop()
+            closures = list(
+                filter(
+                    closure_include(scope_name),
+                    self.closures
+                )
+            )
+            for closure in closures:
+                stack.append(closure['parent'])
+            scope = self.scopes[scope_name]
+            if name in scope:
+                result = scope[name]
+                return result
+
+        raise Exception('Переменная {} не найдена'.format(name))
+
+
+    def variable_set(self, name, value):
+        current = self.scopes[self.scope]
+        if name in current:
+            current[name] = value
+            return
+        raise Exception('Переменная {} не найдена'.format(name))
+
+    def __getattr__(self, name):
+        raise AttributeError('Вызван несуществующий метод {name}'.format(name=name))
+
+    def __getitem__(self, key):
+        method = self.__methods[key]
+        return method.function
+
+    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)