Improve handling of NamedSignalValue

Fixes #30

Signed-off-by: Erik Jaegervall <erik.jaegervall@se.bosch.com>

dbcfeederlib/dbc2vssmapper.py

@@ -27,6 +27,7 @@
 import json
 import logging
 import sys
+import cantools
 
 from dataclasses import dataclass
 from typing import Any, Dict, List, Set, Optional, KeysView
@@ -139,8 +140,25 @@ def transform_value(self, value: Any) -> Any:
         """
         vss_value = None
         if self.transform is None:
-            log.debug("No mapping to VSS %s, using raw value %s", self.vss_name, value)
-            vss_value = value
+            if isinstance(value, cantools.database.can.signal.NamedSignalValue):
+                # We try to be "smart" when doing implicit mapping for NamedSignalValues like
+                # VAL_ 599 DI_uiSpeedUnits 1 "DI_SPEED_KPH" 0 "DI_SPEED_MPH" ;
+                if self.datatype == "string":
+                    # Use string representation if VSS type is string
+                    log.debug("Using string value for %s", self.vss_name)
+                    vss_value = value.name
+                else:
+                    # In all other cases try with numeric value
+                    log.debug("Using numeric value for %s, value is %s of type %s",
+                              self.vss_name, value, type(value.value))
+                    vss_value = value.value
+            elif isinstance(value, (int, float)):
+                log.debug("Using implicit numeric mapping for %s", self.vss_name)
+                vss_value = value
+            else:
+                log.debug("No implicit mapping to VSS for signal %s of type %s with value %s, ignoring it!",
+                          self.vss_name, type(value), value)
+
         else:
             if "mapping" in self.transform:
                 tmp = self.transform["mapping"]