Accept a more specific variable rule in Dictionary.add_variable_from_spec instead of a verbatim string

Author: Thierry RAMORASOAVINA

doc/samples/samples.rst

@@ -93,6 +93,12 @@ Samples
     third_dictionary.add_variable_from_spec(name="StreetNumber", type="Numerical")
     third_dictionary.add_variable_from_spec(name="StreetName", type="Categorical")
     third_dictionary.add_variable_from_spec(name="id_city", type="Categorical")
+    # Add a variable with a rule
+    third_dictionary.add_variable_from_spec(
+        name="computed",
+        type="Numerical",
+        rule=kh.Rule("Ceil", kh.Rule("Product", 3, kh.Rule("Random()"))),
+    )
 
     # Add the variables used in a multi-table context in the first dictionary.
     # They link the root dictionary to the additional ones

khiops/core/dictionary.py

@@ -845,8 +845,8 @@ def add_variable_from_spec(
             Object type. Ignored if variable type not in ["Entity", "Table"]
         structure_type : str, optional
             Structure type. Ignored if variable type is not "Structure"
-        rule : str, optional
-            Variable rule (in verbatim).
+        rule : `Rule`, optional
+            Variable rule.
         meta_data : dict, optional
             A Python dictionary which holds the metadata specification.
             The dictionary keys are str.
@@ -901,8 +901,8 @@ def add_variable_from_spec(
                     type_error_message("structure_type", structure_type, "string-like")
                 )
         if rule is not None:
-            if not is_string_like(rule):
-                raise TypeError(type_error_message("rule", rule, "string-like"))
+            if not isinstance(rule, Rule):
+                raise TypeError(type_error_message("rule", rule, Rule))
 
         # Variable initialization
         variable = Variable()
@@ -919,7 +919,7 @@ def add_variable_from_spec(
         if structure_type is not None:
             variable.structure_type = structure_type
         if rule is not None:
-            variable.rule = Rule(verbatim=rule)
+            variable.rule = repr(rule)
         self.add_variable(variable)
 
     def remove_variable(self, variable_name):

khiops/samples/samples.ipynb

@@ -105,6 +105,12 @@
     "third_dictionary.add_variable_from_spec(name=\"StreetNumber\", type=\"Numerical\")\n",
     "third_dictionary.add_variable_from_spec(name=\"StreetName\", type=\"Categorical\")\n",
     "third_dictionary.add_variable_from_spec(name=\"id_city\", type=\"Categorical\")\n",
+    "# Add a variable with a rule\n",
+    "third_dictionary.add_variable_from_spec(\n",
+    "    name=\"computed\",\n",
+    "    type=\"Numerical\",\n",
+    "    rule=kh.Rule(\"Ceil\", kh.Rule(\"Product\", 3, kh.Rule(\"Random()\"))),\n",
+    ")\n",
     "\n",
     "# Add the variables used in a multi-table context in the first dictionary.\n",
     "# They link the root dictionary to the additional ones\n",

khiops/samples/samples.py

@@ -107,6 +107,12 @@ def create_dictionary_domain():
     third_dictionary.add_variable_from_spec(name="StreetNumber", type="Numerical")
     third_dictionary.add_variable_from_spec(name="StreetName", type="Categorical")
     third_dictionary.add_variable_from_spec(name="id_city", type="Categorical")
+    # Add a variable with a rule
+    third_dictionary.add_variable_from_spec(
+        name="computed",
+        type="Numerical",
+        rule=kh.Rule("Ceil", kh.Rule("Product", 3, kh.Rule("Random()"))),
+    )
 
     # Add the variables used in a multi-table context in the first dictionary.
     # They link the root dictionary to the additional ones

tests/test_core.py

@@ -1882,8 +1882,8 @@ def test_dictionary_accessors(self):
                     dictionary.add_variable_from_spec(
                         name="fresh_one", type="Entity", object_type={}
                     )
-                # rule must be a str
-                with self.assertRaisesRegex(TypeError, "'rule'.*string-like"):
+                # rule must be Rule object
+                with self.assertRaisesRegex(TypeError, "'rule'.*Rule"):
                     dictionary.add_variable_from_spec(
                         name="fresh_one", type="Categorical", rule={}
                     )
@@ -1892,17 +1892,23 @@ def test_dictionary_accessors(self):
                     dictionary.add_variable_from_spec(
                         name="fresh_one", type="Categorical", meta_data="str"
                     )
-                # successful adding (with meta-data)
+                # successful adding (with meta-data and rule)
                 dictionary.add_variable_from_spec(
                     name="fresh_one",
                     type="Categorical",
                     meta_data={"a": 1, "b": 2},
+                    rule=kh.Rule("Ceil", kh.Rule("Product", 3, kh.Rule("Random()"))),
                 )
                 self.assertEqual(
                     2,
                     dictionary.get_variable("fresh_one").get_value("b"),
                     "Variable meta-data must be set correctly",
                 )
+                self.assertEqual(
+                    "Ceil(Product(3, Random()))",
+                    repr(dictionary.get_variable("fresh_one").get_rule()),
+                    "Variable rule must be set correctly",
+                )
 
                 # Test Dictionary variable block accessors
                 # Create a simple block