Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/idna/intranges.py @ 3:758bc20232e8 draft

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"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:20:52 -0400
parents 26e78fe6e8c4
children
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1 """
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2 Given a list of integers, made up of (hopefully) a small number of long runs
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3 of consecutive integers, compute a representation of the form
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4 ((start1, end1), (start2, end2) ...). Then answer the question "was x present
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5 in the original list?" in time O(log(# runs)).
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6 """
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7
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8 import bisect
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9
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10 def intranges_from_list(list_):
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11 """Represent a list of integers as a sequence of ranges:
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12 ((start_0, end_0), (start_1, end_1), ...), such that the original
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13 integers are exactly those x such that start_i <= x < end_i for some i.
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14
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15 Ranges are encoded as single integers (start << 32 | end), not as tuples.
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16 """
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17
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18 sorted_list = sorted(list_)
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19 ranges = []
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20 last_write = -1
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21 for i in range(len(sorted_list)):
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22 if i+1 < len(sorted_list):
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23 if sorted_list[i] == sorted_list[i+1]-1:
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24 continue
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25 current_range = sorted_list[last_write+1:i+1]
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26 ranges.append(_encode_range(current_range[0], current_range[-1] + 1))
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27 last_write = i
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28
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29 return tuple(ranges)
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30
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31 def _encode_range(start, end):
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32 return (start << 32) | end
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33
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34 def _decode_range(r):
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35 return (r >> 32), (r & ((1 << 32) - 1))
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36
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37
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38 def intranges_contain(int_, ranges):
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39 """Determine if `int_` falls into one of the ranges in `ranges`."""
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40 tuple_ = _encode_range(int_, 0)
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41 pos = bisect.bisect_left(ranges, tuple_)
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42 # we could be immediately ahead of a tuple (start, end)
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43 # with start < int_ <= end
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44 if pos > 0:
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45 left, right = _decode_range(ranges[pos-1])
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46 if left <= int_ < right:
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47 return True
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48 # or we could be immediately behind a tuple (int_, end)
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49 if pos < len(ranges):
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50 left, _ = _decode_range(ranges[pos])
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51 if left == int_:
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52 return True
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53 return False