Fixed #131 : Implement ExprToConditions

Fixed #130 : ArithmeticOperatorParser
Fixed #129 : python_wrapper : create_namespace
Fixed #128 : ExpressionParser: Cannot parse func(x) infixed concept 'xxx'

tests/BaseTest.py

@@ -2,6 +2,7 @@ import ast
 from dataclasses import dataclass, field
 
 from core.builtin_concepts import BuiltinConcepts, ParserResultConcept, ReturnValueConcept
+from core.builtin_helpers import evaluate_from_source, expect_one
 from core.concept import Concept, DEFINITION_TYPE_BNF, DEFINITION_TYPE_DEF, freeze_concept_attrs
 from core.rule import ACTION_TYPE_EXEC, ACTION_TYPE_PRINT, Rule
 from core.sheerka.ExecutionContext import ExecutionContext
@@ -306,3 +307,17 @@ class BaseTest:
 
         # the see the logs, do not forget to add
         # logs = sheerka.get_debugger_logs()
+
+    @staticmethod
+    def evaluate_from_source(context, source, is_question=False):
+        res = evaluate_from_source(context,
+                                   source,
+                                   desc=None,
+                                   eval_body=not is_question,
+                                   eval_where=False,
+                                   is_question=is_question,
+                                   expect_success=False,
+                                   stm=None)
+        res = expect_one(context, res)
+        assert res.status
+        return res.body