Objects: fix bug, add custom directions mapping

- Update player character rep according to its direction.
- Fix init with empty string
- Handle attribute error, so a non fully fetched variable do not
raise an exception.

lib/level/objects.py

@@ -3,12 +3,15 @@
 from typing import Any, Union
 
 
+# Default direction
+_DIRECTION_DICT = {"up": 0, "down": 1, "left": 2, "right": 3}
+
 # pylint: disable=eval-used
 def _value(var: str, env: dict[str, Any]) -> Any:
     """Gets expression value."""
     try:
         return eval(var, {}, env)
-    except KeyError:
+    except (KeyError, AttributeError):
         return None
 
 
@@ -25,6 +28,7 @@ class Object:
         var_dir: str,
         char_rep: str = "o",
         visibility_condition: str = "True",
+        direction_dict: dict[str, Union[int, str]] = _DIRECTION_DICT  # type: ignore
     ):
         """
         Object initialization.
@@ -40,8 +44,9 @@ class Object:
         self.var_x = var_x
         self.var_y = var_y
         self.var_dir = var_dir
-        self.char_rep = char_rep
+        self._char_rep = char_rep
         self.visibility_condition = visibility_condition
+        self.dir_mapping = direction_dict
         # dynamic properties
         self.coord_x: Union[int, None] = None
         self.coord_y: Union[int, None] = None
@@ -61,13 +66,13 @@ class Object:
 
         updated = False
         if self.var_x.startswith(var):
-            self.coord_x = _value(var, self.env)
+            self.coord_x = _value(self.var_x, self.env)
             updated = True
         if self.var_y.startswith(var):
-            self.coord_y = _value(var, self.env)
+            self.coord_y = _value(self.var_y, self.env)
             updated = True
         if self.var_dir.startswith(var):
-            self.direction = _value(var, self.env)
+            self.direction = _value(self.var_dir, self.env)
             updated = True
         if not updated:
             raise Exception(f"Update error: nothing to do with the variable {var}")
@@ -82,8 +87,28 @@ class Object:
             and self.direction >= 0
         )
 
+    @property
+    def char_rep(self) -> str:
+        """Get the character representation of the player."""
+        return self._char_rep
 
 class Player(Object):
     """Player class."""
 
-    # TODO
+    @property
+    def char_rep(self) -> str:
+        """Get the character representation of the player."""
+        up_value = int(self.dir_mapping["up"])
+        down_value = int(self.dir_mapping["down"])
+        left_value = int(self.dir_mapping["left"])
+        right_value = int(self.dir_mapping["right"])
+
+        if self.direction == up_value:
+            return "^"
+        if self.direction == down_value:
+            return "v"
+        if self.direction == left_value:
+            return "<"
+        if self.direction == right_value:
+            return ">"
+        return "?"  # Unknown direction