Implement the new ro.onrc identifier

stdnum/ro/onrc.py

@@ -1,7 +1,7 @@
 # onrc.py - functions for handling Romanian ONRC numbers
 # coding: utf-8
 #
-# Copyright (C) 2020 Dimitrios Josef Moustos
+# Copyright (C) 2024 Dimitrios Josef Moustos
 # Copyright (C) 2020 Arthur de Jong
 #
 # This library is free software; you can redistribute it and/or
@@ -19,20 +19,23 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 # 02110-1301 USA
 
-"""ONRC (Ordine din Registrul Comerţului, Romanian Trade Register identifier).
+"""ONRC (Ordine din Registrul Comer\xc5\xa3ului, Romanian Trade Register identifier).
 
 All businesses in Romania have the to register with the National Trade
 Register Office to receive a registration number. The number contains
-information about the type of company, county, a sequence number and
-registration year. This number can change when registration information
-changes.
+information about the type of company, registration year, a sequence number,
+county and a control sum.
+On 2024-07-26 a new format was introduced and for a while both old and new
+formats need to be valid.
 
 >>> validate('J52/750/2012')
 'J52/750/2012'
 >>> validate('X52/750/2012')
 Traceback (most recent call last):
     ...
 InvalidComponent: ...
+>>> validate('J2012000750528')
+'J2012000750528'
 """
 
 import datetime
@@ -46,16 +49,29 @@
 _cleanup_re = re.compile(r'[ /\\-]+')
 
 # This pattern should match numbers that for some reason have a full date
-# as last field
-_onrc_fulldate_re = re.compile(r'^([A-Z][0-9]+/[0-9]+/)\d{2}[.]\d{2}[.](\d{4})$')
+# as last field for the old format
+_old_onrc_fulldate_re = re.compile(r'^([A-Z][0-9]+/[0-9]+/)\d{2}[.]\d{2}[.](\d{4})$')
+
+# This pattern should match all valid old format numbers
+_old_onrc_re = re.compile(r'^[A-Z][0-9]+/[0-9]+/[0-9]+$')
+
+# This pattern should match all valid new format numbers
+_onrc_re = re.compile(r'^[A-Z]\d{4}\d{6}\d{2}\d$')
 
-# This pattern should match all valid numbers
-_onrc_re = re.compile(r'^[A-Z][0-9]+/[0-9]+/[0-9]+$')
 
 # List of valid counties
 _counties = set(list(range(1, 41)) + [51, 52])
 
+# Calculate the control digit which is used in the last position of the new format
+def _calculate_control_digit(number):
+    """Calculate the control digit for the new ONRC format."""
+    values = {'J': 10, 'F': 6, 'C': 3}
+    num = number[:-1]  # Exclude control digit
+    total = values.get(num[0], 0)  # Map letter to value
+    total += sum(int(d) for d in num[1:] if d.isdigit())
+    return (total + 4) % 10
 
+# This function is only necessary for the old format
 def compact(number):
     """Convert the number to the minimal representation. This strips the
     number of any valid separators and removes surrounding whitespace."""
@@ -67,29 +83,60 @@ def compact(number):
     if number[2:3] == '/':
         number = number[:1] + '0' + number[1:]
     # convert trailing full date to year only
-    m = _onrc_fulldate_re.match(number)
+    m = _old_onrc_fulldate_re.match(number)
     if m:
         number = ''.join(m.groups())
     return number
 
 
 def validate(number):
     """Check if the number is a valid ONRC."""
-    number = compact(number)
-    if not _onrc_re.match(number):
+    if _onrc_re.match(number):
+        if number[0] not in 'JFC':
+            raise InvalidComponent("Invalid register type. Must be J, F, or C.")
+        year = int(number[1:5])
+        sequence = number[5:11]
+        county = int(number[11:13])
+        control_digit = int(number[13])
+
+        # Validate year
+        if year < 1990 or year > datetime.date.today().year:
+            raise InvalidComponent("Year out of valid range.")
+
+        # Validate sequence number (6 digits)
+        if len(sequence) != 6 or not sequence.isdigit():
+            raise InvalidLength("Sequence number must be exactly 6 digits.")
+
+        # Companies registered before 2024-07-26 have the county code
+        if (year <= 2024) and (county not in _counties):
+            raise InvalidComponent("Invalid county code.")
+        # Companies registered after 2024-07-26 have 00 as county code.
+        if (year >= 2024) and (county == 0):
+            raise InvalidComponent("Invalid county code.")
+
+        # Validate control digit
+        expected_control = _calculate_control_digit(number)
+        if control_digit != expected_control:
+            raise InvalidChecksum(f"Control digit {control_digit} does not match expected {expected_control}.")
+
+        return number
+
+    elif _old_onrc_re.match(number):
+        number = compact(number)
+        if number[:1] not in 'JFC':
+            raise InvalidComponent()
+        county, serial, year = number[1:].split('/')
+        if len(serial) > 5:
+            raise InvalidLength()
+        if len(county) not in (1, 2) or int(county) not in _counties:
+            raise InvalidComponent()
+        if len(year) != 4:
+            raise InvalidLength()
+        if int(year) < 1990 or int(year) > 2024:
+            raise InvalidComponent()
+        return number
+    else:
         raise InvalidFormat()
-    if number[:1] not in 'JFC':
-        raise InvalidComponent()
-    county, serial, year = number[1:].split('/')
-    if len(serial) > 5:
-        raise InvalidLength()
-    if len(county) not in (1, 2) or int(county) not in _counties:
-        raise InvalidComponent()
-    if len(year) != 4:
-        raise InvalidLength()
-    if int(year) < 1990 or int(year) > datetime.date.today().year:
-        raise InvalidComponent()
-    return number
 
 
 def is_valid(number):