8000 bpo-41972: Use the "Two-Way" algorithm when searching for long substrings by sweeneyde · Pull Request #22679 · python/cpython · GitHub
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bpo-41972: Use the "Two-Way" algorithm when searching for long substrings #22679

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bpo-41972: Use the "Two-Way" algorithm when searching for long substrings #22679

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899f289
initial implementation
sweeneyde Oct 11, 2020
743a382
refactoring
sweeneyde Oct 12, 2020
fdb6800
formatting fixes
sweeneyde Oct 12, 2020
737ac8a
add shift and bloom
sweeneyde Oct 12, 2020
658038d
📜🤖 Added by blurb_it.
blurb-it[bot] Oct 12, 2020
b62e4c6
add alternating find_char calls
sweeneyde Oct 14, 2020
25a61fb
USe a shift table
sweeneyde Oct 14, 2020
64b9a0a
compute a shift for the last character
sweeneyde Oct 14, 2020
5568ca2
Remove unnecessary special case
sweeneyde Oct 14, 2020
f2054e0
Merge branch 'two-way' of https://github.com/sweeneyde/cpython into t…
sweeneyde Oct 14, 2020
415f492
removed unneeded shift computation
sweeneyde Oct 15, 2020
06c3678
restore original code with special case for long needles
sweeneyde Oct 17, 2020
89bdc34
Minor code cleanups
sweeneyde Oct 17, 2020
9d7bbc3
Restore comment and fix typo
sweeneyde Oct 17, 2020
c331307
Update 2020-10-12-23-46-49.bpo-41972.0pHodE.rst
sweeneyde Oct 17, 2020
66377ce
Add test cases catered to the new algorithm
sweeneyde Oct 17, 2020
e718e5a
Merge branch 'two-way' of https://github.com/sweeneyde/cpython into t…
sweeneyde Oct 17, 2020
cf4e398
Fix typo
sweeneyde Oct 17, 2020
3933992
add a cutoff for haystack length
sweeneyde Oct 19, 2020
c8e54c6
simplify a couple of lines
sweeneyde Oct 19, 2020
8208853
Add better threshholds
sweeneyde Oct 19, 2020
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Update 2020-10-12-23-46-49.bpo-41972.0pHodE.rst
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@sweeneyde
sweeneyde authored Oct 17, 2020
commit c3313075db46012570f2e754414ae8942b03a41e
2 changes: 1 addition & 1 deletion Misc/NEWS.d/next/Core and Builtins/2020-10-12-23-46-49.bpo-41972.0pHodE.rst
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Substring search functions such as ``str1 in str2`` and ``str2.find(str1)`` now use the "Two-Way" string comparison algorithm to avoid quadratic behavior in the worst cases.
Substring search functions such as ``str1 in str2`` and ``str2.find(str1)`` now use the "Two-Way" string comparison algorithm whenever ``str1`` is long enough, to avoid quadratic behavior in the worst cases.
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