fix: evaluate expression from root (#67)

* fix: evaluate expressions from root to support branches
* chore: vscode-pytest only use tests folder

.vscode/settings.json

@@ -3,7 +3,8 @@
 // for contributors.
 {
     "python.testing.pytestArgs": [
-        "."
+        "tests",
+        "examples",
         "-vv"
     ],
     "python.testing.cwd": "${workspaceFolder}",

src/data_factory_testing_framework/functions/__init__.py

@@ -1,5 +1,7 @@
+from data_factory_testing_framework.functions.evaluator import ExpressionEvaluator
 from data_factory_testing_framework.functions.functions_repository import FunctionsRepository
 
 __all__ = [
     "FunctionsRepository",
+    "ExpressionEvaluator",
 ]

src/data_factory_testing_framework/functions/evaluator/__init__.py

@@ -0,0 +1,5 @@
+from .expression_evaluator import ExpressionEvaluator
+
+__all__ = [
+    "ExpressionEvaluator",
+]

src/data_factory_testing_framework/functions/evaluator/exceptions.py

@@ -0,0 +1,21 @@
+from typing import Union
+
+from data_factory_testing_framework.exceptions.expression_evaluation_error import ExpressionEvaluationError
+
+
+class ExpressionEvaluationInvalidNumberOfChildrenError(ExpressionEvaluationError):
+    """Expression evaluation invalid number of children error."""
+
+    def __init__(self, required: int, actual: int) -> None:
+        """Initialize expression evaluation invalid number of children error."""
+        super().__init__(f"Invalid number of children. Required: {required}, Actual: {actual}")
+
+
+class ExpressionEvaluationInvalidChildTypeError(ExpressionEvaluationError):
+    """Expression evaluation invalid child type error."""
+
+    def __init__(self, child_index: int, expected_types: Union[tuple[type], type], actual_type: type) -> None:
+        """Initialize expression evaluation invalid child type error."""
+        super().__init__(
+            f"Invalid child type at index {child_index}. Expected: {expected_types}, Actual: {actual_type}"
+        )