refactor: Extract Duplicate Code into Helper Function in `ivy\func_…

…wrapper.py` (ivy-llc#26572)

Co-authored-by: vedpatwardhan <[email protected]>

ivy/func_wrapper.py

@@ -91,91 +91,41 @@ def caster(dtype, intersect):
                 return ret_dtype
 
 
+def cast_helper(arg, dtype, intersect, is_upcast=True):
+    step = 1 if is_upcast else -1
+    index = casting_modes_dict[arg]().index(dtype) + step
+    result = ""
+    while 0 <= index < len(casting_modes_dict[arg]()):
+        if casting_modes_dict[arg]()[index] not in intersect:
+            result = casting_modes_dict[arg]()[index]
+            break
+        index += step
+
+    return result
+
+
 def upcaster(dtype, intersect):
     # upcasting is enabled, we upcast to the highest
     if "uint" in str(dtype):
-        index = casting_modes_dict["uint"]().index(dtype) + 1
-        result = ""
-        while index < len(casting_modes_dict["uint"]()):
-            if casting_modes_dict["uint"]()[index] not in intersect:
-                result = casting_modes_dict["uint"]()[index]
-                break
-            index += 1
-        return result
-
+        return cast_helper("uint", dtype, intersect, is_upcast=True)
     if "int" in dtype:
-        index = casting_modes_dict["int"]().index(dtype) + 1
-        result = ""
-        while index < len(casting_modes_dict["int"]()):
-            if casting_modes_dict["int"]()[index] not in intersect:
-                result = casting_modes_dict["int"]()[index]
-                break
-            index += 1
-        return result
-
+        return cast_helper("int", dtype, intersect, is_upcast=True)
     if "float" in dtype:
-        index = casting_modes_dict["float"]().index(dtype) + 1
-        result = ""
-        while index < len(casting_modes_dict["float"]()):
-            if casting_modes_dict["float"]()[index] not in intersect:
-                result = casting_modes_dict["float"]()[index]
-                break
-            index += 1
-        return result
-
+        return cast_helper("float", dtype, intersect, is_upcast=True)
     if "complex" in dtype:
-        index = casting_modes_dict["complex"]().index(dtype) + 1
-        result = ""
-        while index < len(casting_modes_dict["complex"]()):
-            if casting_modes_dict["complex"]()[index] not in intersect:
-                result = casting_modes_dict["complex"]()[index]
-                break
-            index += 1
-        return result
+        return cast_helper("complex", dtype, intersect, is_upcast=True)
 
 
 def downcaster(dtype, intersect):
     # downcasting is enabled, we upcast to the highest
     if "uint" in str(dtype):
-        index = casting_modes_dict["uint"]().index(dtype) - 1
-        result = ""
-        while index >= 0:
-            if casting_modes_dict["int"]()[index] not in intersect:
-                result = casting_modes_dict["uint"]()[index]
-                break
-            index -= 1
-        return result
-
+        return cast_helper("uint", dtype, intersect, is_upcast=False)
     if "int" in dtype:
-        index = casting_modes_dict["int"]().index(dtype) - 1
-        result = ""
-        while index >= 0:
-            if casting_modes_dict["int"]()[index] not in intersect:
-                result = casting_modes_dict["int"]()[index]
-                break
-            index -= 1
-        return result
-
+        return cast_helper("int", dtype, intersect, is_upcast=False)
     if "float" in dtype:
-        index = casting_modes_dict["float"]().index(dtype) - 1
-
-        result = ""
-        while index >= 0:
-            if casting_modes_dict["float"]()[index] not in intersect:
-                result = casting_modes_dict["float"]()[index]
-                break
-            index -= 1
-        return result
-
+        return cast_helper("float", dtype, intersect, is_upcast=False)
     if "complex" in dtype:
-        index = casting_modes_dict["complex"]().index(dtype) - 1
-        result = ""
-        while index >= 0:
-            if casting_modes_dict["complex"]()[index] not in intersect:
-                result = casting_modes_dict["complex"]()[index]
-                break
-            index -= 1
-        return result
+        return cast_helper("complex", dtype, intersect, is_upcast=False)
 
 
 def cross_caster(intersect):