Created IAC reverse generator

src/iac_reverse/generator/sanitize.py

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+"""Identifier sanitization for Terraform resource names.
+
+Converts arbitrary resource names into valid Terraform identifiers
+matching the pattern: ^[a-zA-Z_][a-zA-Z0-9_]*$
+"""
+
+import re
+
+
+def sanitize_identifier(name: str) -> str:
+    """Convert a resource name to a valid Terraform identifier.
+
+    Terraform identifiers must match: ^[a-zA-Z_][a-zA-Z0-9_]*$
+
+    Rules applied:
+    - Replace any character not in [a-zA-Z0-9_] with underscore
+    - Collapse multiple consecutive underscores into one
+    - If result starts with a digit, prepend an underscore
+    - If result is empty or only underscores, return "_resource"
+
+    Args:
+        name: Any string resource name.
+
+    Returns:
+        A valid Terraform identifier derived from the input.
+    """
+    # Replace any non-alphanumeric/underscore character with underscore
+    result = re.sub(r"[^a-zA-Z0-9_]", "_", name)
+
+    # Collapse multiple consecutive underscores into one
+    result = re.sub(r"_+", "_", result)
+
+    # If result is only underscores or empty, return fallback
+    if not result or result.strip("_") == "":
+        return "_resource"
+
+    # If starts with a digit, prepend underscore
+    if result[0].isdigit():
+        result = "_" + result
+
+    return result