feat: add support for local expressions in ADExpressionContext and update smart condition handling

adexpressioncontext.py

@@ -1,5 +1,5 @@
 import pyparsing as pp
-from expressionparser import BaseExpressionContext
+from expressionparser import BaseExpressionContext, ExpressionParser
 
 class ADExpressionContext(BaseExpressionContext):
     def __init__(self,appdaemon_api, sensor_existence_validation = True):
@@ -13,6 +13,7 @@ class ADExpressionContext(BaseExpressionContext):
         self.sensors_default_value = dict()
         self.sensor_states = dict()
         self.sensor_existence_validation = sensor_existence_validation
+        self.local_expressions = {}
 
         self.declare_default_constants()
 
@@ -131,7 +132,22 @@ class ADExpressionContext(BaseExpressionContext):
     def get_entities_to_listen(self):
         return self.entities_to_listen
 
-    def get_constant_value(self,name): return self.variables[name]
+    def get_constant_value(self, name):
+        if name in self.local_expressions:
+            return self.local_expressions[name].eval()
+        return self.variables[name]
+
+    def declare_local_expression(self, name: str, expression_string: str):
+        assert name not in self.variables, f"'{name}' is already declared"
+        assert name.replace('_', '').isalnum() and name.isascii(), f"Invalid local expression name: {name}"
+        # Register as a constant placeholder so the variable parser recognises it
+        self.variables[name] = None
+        self.constants.append(name)
+        self.parser = None  # reset variable parser cache
+        # Parse the expression; set_context registers its sensor dependencies
+        # Store only the parsed tree so evaluation skips the top-level reset()
+        full_parser = ExpressionParser(expression_string, self)
+        self.local_expressions[name] = full_parser.parsed_data
 
     def declare_constant(self,name : str,value):
         def is_a_sensor(string):

smartcondition.py

@@ -31,6 +31,7 @@ class Evaluator():
     __LOG_INIT                          = "log_init"
     __EXTRA_ENTITIES_TO_LISTEN          = "extra_entities_to_listen"
     __CONSTANTS                         = "constants"
+    __LOCAL_EXPRESSIONS_STRING          = "local_expressions"
     __UNAVAIBILITY_RESULT               = "unavaibility_result"
     
     def __init__(self, appdaemon_api, conditions_block,**kwargs):
@@ -313,6 +314,12 @@ class Evaluator():
                                     if disable_conditions_args:
                                         add_conditions_to_conditions_block(conditions_block,self.__DISABLE_CONDITIONS_STRING,disable_conditions_args)
 
+                                    local_expressions_args = param_parser.parse_args(self.__LOCAL_EXPRESSIONS_STRING, None)
+                                    if local_expressions_args:
+                                        if self.__LOCAL_EXPRESSIONS_STRING not in conditions_block:
+                                            conditions_block[self.__LOCAL_EXPRESSIONS_STRING] = {}
+                                        conditions_block[self.__LOCAL_EXPRESSIONS_STRING].update(local_expressions_args)
+
                                     if param_parser.parse_args(self.__TEMPLATE_CONDITIONS_STRING, None):
                                         self.__log(f"Template '{template}' contain recursive template",level = "ERROR")                                                            
                                     
@@ -377,7 +384,19 @@ class Evaluator():
                     if self.__log_init:
                         self.__log(f"{constant_name} = {value}")
                     self.expression_context.declare_constant(constant_name,value)
-        
+
+            local_expressions = param_parser.parse_args(self.__LOCAL_EXPRESSIONS_STRING, None)
+            if local_expressions:
+                if self.__log_init:
+                    self.__log(f"declaring local expressions:")
+                for expr_name, expr_string in local_expressions.items():
+                    if self.__log_init:
+                        self.__log(f"{expr_name} = {expr_string}")
+                    self.expression_context.declare_local_expression(expr_name, str(expr_string))
+                # Ensure sensors referenced only in local_expressions are registered as
+                # listeners even if no condition string references them directly.
+                self.__add_to_entities_to_listen(self.expression_context.get_entities_to_listen())
+
 
             trigger_conditions_args = param_parser.parse_args(self.__TRIGGER_CONDITIONS_STRING,None)
             if trigger_conditions_args:

unit_tests/test_template.yaml

@@ -23,6 +23,10 @@ templates_library:
     trigger_conditions: binary_sensor.off == False
     blocking_conditions:
       - binary_sensor.on
+  T4:
+    local_expressions:
+      local_threshold: "binary_sensor.true ? 170 : 200"
+    trigger_conditions: sensor.int170 == local_threshold
 
 tests:
   test_1: 
@@ -44,3 +48,25 @@ tests:
     conditions: 
       template_conditions: <T2>,<T3>
       trigger_conditions: binary_sensor.true and binary_sensor.false
+
+  # local_expressions in a template
+  test_5_local_expr_in_template_true:
+    expected_result: Succeeded
+    conditions:
+      template_conditions: <T4>
+
+  # local_expressions declared directly in conditions block
+  test_6_local_expr_inline_true:
+    expected_result: Succeeded
+    conditions:
+      local_expressions:
+        my_threshold: "binary_sensor.true ? 17 : 200"
+      trigger_conditions: sensor.int17 == my_threshold
+
+  # local_expressions inline, condition not met
+  test_7_local_expr_inline_false:
+    expected_result: Failed
+    conditions:
+      local_expressions:
+        my_threshold: "binary_sensor.false ? 17 : 200"
+      trigger_conditions: sensor.int17 == my_threshold