Make chunk_by_word isomorphic

cognee/tasks/chunks/chunk_by_word.py

@@ -4,20 +4,29 @@ SENTENCE_ENDINGS = r"[.;!?…]"
 PARAGRAPH_ENDINGS = r"[\n\r]"
 
 def chunk_by_word(data: str):
+    """
+    Chunks text into words and endings while preserving whitespace.
+    Whitespace is included with the preceding word.
+    Outputs can be joined with "" to recreate the original input.
+    """
     last_processed_character = ""
-    word = ""
+    current_chunk = ""
     i = 0
+    
+    # Handle leading whitespace if any
+    while i < len(data) and (re.match(PARAGRAPH_ENDINGS, data[i]) or data[i] == " "):
+        current_chunk += data[i]
+        i += 1
+    if current_chunk:
+        yield (current_chunk, "word")
+        current_chunk = ""
+    
     while i < len(data):
         character = data[i]
-
-        if word == "" and (re.match(PARAGRAPH_ENDINGS, character) or character == " "):
-            i = i + 1
-            continue
-
+            
         def is_real_paragraph_end():
             if re.match(SENTENCE_ENDINGS, last_processed_character):
                 return True
-
             j = i + 1
             next_character = data[j] if j < len(data) else None
             while next_character is not None and (re.match(PARAGRAPH_ENDINGS, next_character) or next_character == " "):
@@ -25,35 +34,44 @@ def chunk_by_word(data: str):
                 next_character = data[j] if j < len(data) else None
             if next_character and next_character.isupper():
                 return True
-
             return False
-
+            
         if re.match(PARAGRAPH_ENDINGS, character):
-            yield (word, "paragraph_end" if is_real_paragraph_end() else "word")
-            word = ""
-            i = i + 1
+            if current_chunk:
+                yield (current_chunk, "word")
+                current_chunk = ""
+            yield (character, "paragraph_end" if is_real_paragraph_end() else "word")
+            i += 1
             continue
-
-        if character == " ":
-            yield [word, "word"]
-            word = ""
-            i = i + 1
-            continue
-
-        word += character
+            
+        current_chunk += character
         last_processed_character = character
-
+        
+        if character == " ":
+            yield (current_chunk, "word")
+            current_chunk = ""
+            i += 1
+            continue
+        
         if re.match(SENTENCE_ENDINGS, character):
-            # Check for ellipses.
-            if i + 2 <= len(data) and data[i] == "." and data[i + 1] == "." and data[i + 2] == ".":
-                word += ".."
-                i = i + 2
-
-            is_paragraph_end = i + 1 < len(data) and re.match(PARAGRAPH_ENDINGS, data[i + 1])
-            yield (word, "paragraph_end" if is_paragraph_end else "sentence_end")
-            word = ""
-
+            # Check for ellipses
+            if i + 2 < len(data) and data[i:i+3] == "...":
+                current_chunk += ".."
+                i += 2
+                
+            # Look ahead for whitespace
+            next_i = i + 1
+            while next_i < len(data) and data[next_i] == " ":
+                current_chunk += data[next_i]
+                next_i += 1
+                
+            is_paragraph_end = next_i < len(data) and re.match(PARAGRAPH_ENDINGS, data[next_i])
+            yield (current_chunk, "paragraph_end" if is_paragraph_end else "sentence_end")
+            current_chunk = ""
+            i = next_i
+            continue
+            
         i += 1
-
-    if len(word) > 0:
-        yield (word, "word")
+        
+    if current_chunk:
+        yield (current_chunk, "word")