fix: defaulting carla_map to map .xodr path in scenic files (#237)

* fix: defaulting carla_map to map .xodr path in scenic files

---------

Co-authored-by: Armando Banuelos <abanuelo@Armandos-MacBook-Pro.local>
Co-authored-by: Armando Banuelos <abanuelo@Armandos-MBP.lan>

src/scenic/simulators/carla/model.scenic

@@ -39,7 +39,7 @@ Global Parameters:
 .. _carla.WeatherParameters: https://carla.readthedocs.io/en/latest/python_api/#carlaweatherparameters
 
 """
-
+import pathlib
 from scenic.domains.driving.model import *
 
 import scenic.simulators.carla.blueprints as blueprints
@@ -70,7 +70,8 @@ except ModuleNotFoundError:
     class _CarlaVehicle: pass
     class _CarlaPedestrian: pass
 
-param carla_map = None
+map_town = pathlib.Path(globalParameters.map).stem
+param carla_map = map_town
 param address = '127.0.0.1'
 param port = 2000
 param timeout = 10

tests/simulators/carla/test_carla.py

@@ -8,6 +8,17 @@
 )
 
 
+def test_map_param_parse(getAssetPath):
+    mapPath = getAssetPath("maps/CARLA/Town01.xodr")
+    code = f"""
+        param map = r'{mapPath}'
+        model scenic.simulators.carla.model
+        ego = new Car
+    """
+    scenario = compileScenic(code, mode2D=True)
+    assert scenario.params["carla_map"] == "Town01"
+
+
 def test_basic(loadLocalScenario):
     scenario = loadLocalScenario("basic.scenic", mode2D=True)
     scenario.generate(maxIterations=1000)