revert part of [ModelicaSystem] use packaging.version.Version to replace parse_om_version()

* the OM version does not match to the one expected by packaging.version.Version
* keep it simple ...

Author: syntron

OMPython/ModelicaSystem.py

@@ -11,14 +11,14 @@
 import os
 import pathlib
 import queue
+import re
 import textwrap
 import threading
 from typing import Any, cast, Optional
 import warnings
 import xml.etree.ElementTree as ET
 
 import numpy as np
-from packaging.version import Version
 
 from OMPython.OMCSession import (
     OMCSessionException,
@@ -351,9 +351,7 @@ def __init__(
 
         # get OpenModelica version
         version_str = self.sendExpression(expr="getVersion()")
-        # remove 'OpenModelica ' at the start of the string and possible development ids (i.e. '~dev-26-g10bb273')
-        version_str = version_str[13:version_str.find('~')]
-        self._version = Version(version_str)
+        self._version = self._parse_om_version(version=version_str)
         # set commandLineOptions using default values or the user defined list
         if command_line_options is None:
             # set default command line options to improve the performance of linearization and to avoid recompilation if
@@ -1023,6 +1021,14 @@ def getOptimizationOptions(
 
         raise ModelicaSystemError("Unhandled input for getOptimizationOptions()")
 
+    def _parse_om_version(self, version: str) -> tuple[int, int, int]:
+        match = re.search(r"v?(\d+)\.(\d+)\.(\d+)", version)
+        if not match:
+            raise ValueError(f"Version not found in: {version}")
+        major, minor, patch = map(int, match.groups())
+
+        return major, minor, patch
+
     def _process_override_data(
             self,
             om_cmd: ModelicaSystemCmd,
@@ -1041,7 +1047,7 @@ def _process_override_data(
         # pass them to simulation executable directly as individual arguments
         # see https://github.com/OpenModelica/OpenModelica/pull/14813
         if override_sim:
-            if self._version >= Version("1.26.0"):
+            if self._version >= (1, 26, 0):
                 for key, opt_value in override_sim.items():
                     om_cmd.arg_set(key=key, val=str(opt_value))
             else:

pyproject.toml

@@ -17,7 +17,6 @@ license = { file = "LICENSE" }
 requires-python = ">=3.10"
 dependencies = [
     "numpy",
-    "packaging",
     "psutil",
     "pyparsing",
     "pyzmq",