Provide an input validation module.

1 files changed, 27 insertions, 0 deletions

diff --git a/qc_app/input_validation.py b/qc_app/input_validation.py
new file mode 100644
index 0000000..96c2f05
--- /dev/null
+++ b/qc_app/input_validation.py
@@ -0,0 +1,27 @@
+"""Input validation utilities"""
+from typing import Any
+
+def is_empty_string(value: str) -> bool:
+    """Check whether as string is empty"""
+    return (isinstance(value, str) and value.strip() == "")
+
+def is_empty_input(value: Any) -> bool:
+    """Check whether user provided an empty value."""
+    return (value is None or is_empty_string(value))
+
+def is_integer_input(value: Any) -> bool:
+    """
+    Check whether user provided a value that can be parsed into an integer.
+    """
+    def __is_int__(val, base):
+        try:
+            int(val, base=10)
+        except ValueError as verr:
+            return False
+        return True
+    return isinstance(value, int) or (
+        (not is_empty_input(value)) and (
+            isinstance(str) and (
+                __is_int__(value, 10)
+                or __is_int__(value, 8)
+                or __is_int__(value, 16))))