Fixed #18 : Parsing and evaluating Python

src/services/BaseService.py

@@ -0,0 +1,49 @@
+from common.global_symbols import NotFound
+from common.utils import sheerka_deepcopy
+from core.Sheerka import Sheerka
+
+
+class BaseService:
+    """
+    Base class for services
+    """
+
+    def __init__(self, sheerka: Sheerka, order=999):
+        self.sheerka = sheerka
+        self.order = order  # initialisation order. The lowest is initialized first
+
+    def initialize(self):
+        """
+        Adds cache or bind methods
+        :return:
+        """
+        pass
+
+    def state_properties(self):
+        pass
+
+    def push_state(self, context):
+        """
+        Use variable Manager to store the state of the service
+        """
+        args = self.state_properties()
+        if args:
+            for prop_name in args:
+                self.sheerka.record_var(context, self.NAME, prop_name, sheerka_deepcopy(getattr(self, prop_name)))
+
+    def pop_state(self):
+        """
+        Use Variable Manager to restore the state of a service
+        :return:
+        """
+        args = self.state_properties()
+        if args:
+            for prop_name in args:
+                if (value := self.sheerka.load_var(self.NAME, prop_name)) is not NotFound:
+                    setattr(self, prop_name, value)
+
+    def store_var(self, context, var_name):
+        """
+        Store/record the value of an attribute
+        """
+        self.sheerka.record_var(context, self.NAME, var_name, getattr(self, var_name))