feat(low-code): camel_case_to_snake_case macros (#617)

Co-authored-by: octavia-squidington-iii <contact@airbyte.com>

Author: darynaishchenko

airbyte_cdk/sources/declarative/interpolation/macros.py

@@ -4,6 +4,7 @@
 
 import builtins
 import datetime
+import re
 import typing
 from typing import Optional, Union
 from urllib.parse import quote_plus
@@ -194,6 +195,18 @@ def sanitize_url(value: str) -> str:
     return sanitization_strategy(value)
 
 
+def camel_case_to_snake_case(value: str) -> str:
+    """
+     Converts CamelCase strings to snake_case format
+
+     Usage:
+    `"{{ camel_case_to_snake_case('CamelCase') }}"`
+     :param value: string to convert from CamelCase to snake_case
+     :return: snake_case formatted string
+    """
+    return re.sub(r"(?<!^)(?=[A-Z])", "_", value).lower()
+
+
 _macros_list = [
     now_utc,
     today_utc,
@@ -206,5 +219,6 @@ def sanitize_url(value: str) -> str:
     today_with_timezone,
     str_to_datetime,
     sanitize_url,
+    camel_case_to_snake_case,
 ]
 macros = {f.__name__: f for f in _macros_list}

unit_tests/sources/declarative/interpolation/test_macros.py

@@ -19,6 +19,7 @@
         ("test_day_delta", "day_delta", True),
         ("test_format_datetime", "format_datetime", True),
         ("test_duration", "duration", True),
+        ("test_camel_case_to_snake_case", "camel_case_to_snake_case", True),
         ("test_not_a_macro", "thisisnotavalidmacro", False),
     ],
 )
@@ -249,3 +250,28 @@ def test_sanitize_url(test_name, input_value, expected_output):
     sanitize_url = macros["sanitize_url"]
     actual_output = sanitize_url(input_value)
     assert actual_output == expected_output
+
+
+@pytest.mark.parametrize(
+    "value, expected_value",
+    [
+        (
+            "CamelCase",
+            "camel_case",
+        ),
+        (
+            "snake_case",
+            "snake_case",
+        ),
+        (
+            "CamelCasesnake_case",
+            "camel_casesnake_case",
+        ),
+        (
+            "CamelCase_snake_case",
+            "camel_case_snake_case",
+        ),
+    ],
+)
+def test_camel_case_to_snake_case(value, expected_value):
+    assert macros["camel_case_to_snake_case"](value) == expected_value