Update loyola.py

loyola.py

@@ -26,6 +26,7 @@ i.e. the task of adding spaces between the words on a identifier.
 """
 _URL = "https://raw.githubusercontent.com/ruanchaves/hashformers/master/datasets/loyola-udelaware-identifier-splitting-oracle.txt"
 
+
 class Loyola(datasets.GeneratorBasedBuilder):
 
     VERSION = datasets.Version("1.0.0")
@@ -71,10 +72,24 @@ class Loyola(datasets.GeneratorBasedBuilder):
                             break
                     except StopIteration:
                         break
+
             output = haystack
+            
+            while pos:
+                next_pos = pos.popleft()
+                output = output[:next_pos] + " " + output[next_pos:]
+           
+            pos = deque()
+            previous = output[0]
+            for index, char in enumerate(output[1:]):
+                if (not previous.isalnum() and not previous.isspace()) and char.isalnum():
+                    pos.appendleft(index + 1)
+                previous = char
+
             while pos:
                 next_pos = pos.popleft()
                 output = output[:next_pos] + " " + output[next_pos:]
+
             return output
 
         with open(filepath, 'r') as f: