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# Copyright (c) Meta Platforms, Inc. and affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
def expand_tabs(line: str) -> str:
"""
Tabs are treated as 1-8 spaces according to
https://docs.python.org/3/reference/lexical_analysis.html#indentation
Given a string with tabs, this removes all tab characters and replaces them with the
appropriate number of spaces.
"""
result_list = []
total = 0
for ch in line:
if ch == "\t":
prev_total = total
total = ((total + 8) // 8) * 8
result_list.append(" " * (total - prev_total))
else:
total += 1
result_list.append(ch)
return "".join(result_list)
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