diversion: Remove RuleComponent class to avoid coupling of classes

Replace tight coupling of Action and Condition classes by removing their
common base class and converting it into a function.

The RuleComponent was a base class solely holding a compile function and
passing it to its children. There is no need for tight coupling with
inheritance for that purpose.

Related pwr-Solaar#2659

lib/logitech_receiver/diversion.py

@@ -511,19 +511,19 @@ def charging(f, r, d, _a):
     "mouse-noop": [],
 }
 
-# COMPONENTS = {}
 
-
-class RuleComponent:
-    def compile(self, c):
-        if isinstance(c, RuleComponent):
-            return c
-        elif isinstance(c, dict) and len(c) == 1:
-            k, v = next(iter(c.items()))
-            if k in COMPONENTS:
-                return COMPONENTS[k](v)
-        logger.warning("illegal component in rule: %s", c)
-        return Condition()
+def compile_component(c):
+    if isinstance(c, Rule) or isinstance(c, Condition) or isinstance(c, Action):
+        return c
+    elif isinstance(c, dict) and len(c) == 1:
+        k, v = next(iter(c.items()))
+        try:
+            cls = COMPONENTS[k]
+            return cls(v)
+        except KeyError:
+            pass
+    logger.warning("illegal component in rule: %s", c)
+    return FalllbackCondition()
 
 
 def _evaluate(components, feature, notification: HIDPPNotification, device, result) -> Any:
@@ -537,9 +537,9 @@ def _evaluate(components, feature, notification: HIDPPNotification, device, resu
     return res
 
 
-class Rule(RuleComponent):
+class Rule:
     def __init__(self, args, source=None, warn=True):
-        self.components = [self.compile(a) for a in args]
+        self.components = [compile_component(a) for a in args]
         self.source = source
 
     def __str__(self):
@@ -559,7 +559,7 @@ def data(self):
         return {"Rule": [c.data() for c in self.components]}
 
 
-class Condition(RuleComponent):
+class Condition:
     def __init__(self, *args):
         pass
 
@@ -577,7 +577,7 @@ def __init__(self, op, warn=True):
         if isinstance(op, list) and len(op) == 1:
             op = op[0]
         self.op = op
-        self.component = self.compile(op)
+        self.component = compile_component(op)
 
     def __str__(self):
         return "Not: " + str(self.component)
@@ -594,7 +594,7 @@ def data(self):
 
 class Or(Condition):
     def __init__(self, args, warn=True):
-        self.components = [self.compile(a) for a in args]
+        self.components = [compile_component(a) for a in args]
 
     def __str__(self):
         return "Or: [" + ", ".join(str(c) for c in self.components) + "]"
@@ -617,7 +617,7 @@ def data(self):
 
 class And(Condition):
     def __init__(self, args, warn=True):
-        self.components = [self.compile(a) for a in args]
+        self.components = [compile_component(a) for a in args]
 
     def __str__(self):
         return "And: [" + ", ".join(str(c) for c in self.components) + "]"
@@ -1145,7 +1145,7 @@ def data(self):
         return {"Host": self.host}
 
 
-class Action(RuleComponent):
+class Action:
     def __init__(self, *args):
         pass
 

lib/solaar/ui/diversion_rules.py

@@ -524,7 +524,7 @@ def menu_do_copy(self, _mitem: Gtk.MenuItem, m: Gtk.TreeStore, it: Gtk.TreeIter)
 
         wrapped = m[it][0]
         c = wrapped.component
-        _rule_component_clipboard = diversion.RuleComponent().compile(c.data())
+        _rule_component_clipboard = diversion.compile_component(c.data())
 
     def menu_do_cut(self, _mitem, m, it):
         global _rule_component_clipboard
@@ -545,7 +545,7 @@ def menu_do_paste(self, _mitem, m, it, below=False):
         c = _rule_component_clipboard
         _rule_component_clipboard = None
         if c:
-            _rule_component_clipboard = diversion.RuleComponent().compile(c.data())
+            _rule_component_clipboard = diversion.compile_component(c.data())
             self._menu_do_insert(_mitem, m, it, new_c=c, below=below)
             self._on_update()
 

lib/solaar/ui/rule_base.py

@@ -20,7 +20,6 @@
 from typing import Callable
 
 from gi.repository import Gtk
-from logitech_receiver import diversion
 
 
 def norm(s):
@@ -50,8 +49,6 @@ def add_completion_to_entry(cls, entry, values):
 
 
 class RuleComponentUI(abc.ABC):
-    CLASS = diversion.RuleComponent
-
     def __init__(self, panel, on_update: Callable = None):
         self.panel = panel
         self.widgets = {}  # widget -> coord. in grid
@@ -109,5 +106,5 @@ def _remove_panel_items(self):
         for c in self.panel.get_children():
             self.panel.remove(c)
 
-    def update_devices(self):  # noqa: B027
-        pass
+    def update_devices(self) -> None:
+        return None