refactored decide functions

kabuki/actor.py

@@ -10,41 +10,41 @@ def get_src(pvname, cls):
         src = src_cache[pvname]
         assert isinstance(src, cls)
     except KeyError:
-        src = cls(pvname)
-        src_cache[pvname] = src
+        src = src_cache[pvname] = cls(pvname)
     return src
 
 
 def decide_src_plt(pvname):
-    pvname = pvname.upper()
+    Src = decide_src_type(pvname)
+    src = get_src(pvname, Src)
+    if not src.is_connected:
+        raise RuntimeError(f"{pvname} is not connected")
 
-    if pvname.endswith(":FPICTURE"):
-        print("Camera", pvname)
-        src = get_src(pvname, Camera)
-        plt = Plot2D
-        if not src.is_connected:
-            raise RuntimeError(f"{pvname} is not connected")
+    Plt = decide_plt_type(src)
+    plt = Plt(name=pvname)
 
-    else:
-        print("Source", pvname)
-        src = get_src(pvname, Source)
-        if not src.is_connected:
-            raise RuntimeError(f"{pvname} is not connected")
-        print(src.nelm)
-        if src.nelm == 0:
-            raise RuntimeError(f"{src}: {src.value}")
-
-        if src.nelm == 1:
-            print("Scalar")
-            plt = Plot0D
-        else:
-            print("Curve")
-            plt = Plot1D
-
-    plt = plt(name=pvname)
     return src, plt
 
 
+def decide_src_type(pvname):
+    if pvname.endswith(":FPICTURE"):
+        return Camera
+    return Source
+
+
+def decide_plt_type(src):
+    if isinstance(src, Camera):
+        return Plot2D
+
+    nelm = src.nelm
+    if nelm == 1:
+        return Plot0D
+    elif nelm > 1:
+        return Plot1D
+
+    raise RuntimeError(f"Cannot decide plot type for {src}: {src.value}")
+
+
 
 class Actor: