@@ -254,19 +254,37 @@ def _should_auto_indent(buffer: list[str], pos: int) -> bool:
254254# check if last character before "pos" is a colon, ignoring
255255# whitespaces and comments.
256256last_char = None
257- while pos > 0 :
258- pos -= 1
259- if last_char is None :
260- if buffer [pos ]not in "\t \n #" :# ignore whitespaces and comments
261- last_char = buffer [pos ]
262- else :
263- # even if we found a non-whitespace character before
264- # original pos, we keep going back until newline is reached
265- # to make sure we ignore comments
266- if buffer [pos ]== "\n " :
267- break
268- if buffer [pos ]== "#" :
269- last_char = None
257+ # A stack to keep track of string delimiters (quotes). Push a quote when
258+ # entering a string, and pop it when the string ends. When the stack is
259+ # empty, we're not inside a string. If encounter a '#' while not inside a
260+ # string, it's a comment start; otherwise, it's just a '#' character within
261+ # a string.
262+ in_string :list [str ]= []
263+ in_comment = False
264+ i = - 1
265+ while i < pos - 1 :
266+ i += 1
267+ char = buffer [i ]
268+
269+ # update last_char
270+ if char == "#" :
271+ if in_string :
272+ last_char = char # '#' inside a string is just a character
273+ else :
274+ in_comment = True
275+ elif char == "\n " :
276+ # newline ends a comment
277+ in_comment = False
278+ elif char not in "\t " and not in_comment and not in_string :
279+ # update last_char with non-whitespace chars outside comments and strings
280+ last_char = char
281+
282+ # update stack
283+ if char in "\" '" and (i == 0 or buffer [i - 1 ]!= "\\ " ):
284+ if in_string and in_string [- 1 ]== char :
285+ in_string .pop ()
286+ else :
287+ in_string .append (char )
270288return last_char == ":"
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