All JS and Python tests passing.

packages/python/test/index.py

@@ -6,12 +6,17 @@ sys.path.insert(1, os.path.join(sys.path[0], '..'))
 from parser import createLineData, parseLine
 
 def next():
-  return sys.stdin.readline().rstrip('\n')
+  # For blank lines, readline will return a newline.
+  # For no result, readline will return a string of length 0.
+  line = sys.stdin.readline()
+  # Since we strip trailing newlines resulting in an empty string for empty lines,
+  # return None if there actually is no result.
+  return line.rstrip('\n') if len(line) > 0 else None
 
 def linedata_basic ():
   lineData = createLineData('')
 
-  while l := next():
+  while (l := next()) != None:
     lineData['line'] = l
     parseLine(lineData)
     print("| level {level} | indent {indent} | offsetHead {offsetHead} | offsetTail {offsetTail} | line {line} |".format(
@@ -21,7 +26,7 @@ def linedata_basic ():
 def linedata_tabs ():
   lineData = createLineData('', '\t')
 
-  while l := next():
+  while (l := next()) != None:
     lineData['line'] = l
     parseLine(lineData)
     print("| level {level} | indent {indent} | offsetHead {offsetHead} | offsetTail {offsetTail} | line {line} |".format(
@@ -31,10 +36,10 @@ def linedata_tabs ():
 def linedata_head_tail ():
   lineData = createLineData('')
 
-  while l := next():
+  while (l := next()) != None:
     lineData['line'] = l
     parseLine(lineData)
-    head = lineData['line'][lineData['offsetHead']:lineData['offsetTail']] if len(lineData['line']) > lineData['offsetTail'] else ''
+    head = lineData['line'][lineData['offsetHead']:lineData['offsetTail']] if len(lineData['line']) > lineData['offsetHead'] else ''
     tail = lineData['line'][lineData['offsetTail'] + 1:] if len(lineData['line']) > lineData['offsetTail'] + 1 else ''
 
     print("| head {head} | tail {tail} |".format(