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Store needle length #52

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Store needle length #52

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3fddc81
Store needle length
snoyes Nov 26, 2019
c77359e
Merge branch 'master' into optimize-kmp
snoyes Aug 21, 2024
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9 changes: 5 additions & 4 deletions pyscreeze/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -495,10 +495,11 @@ def _kmp(needle, haystack, _dummy): # Knuth-Morris-Pratt search algorithm implem
"""
TODO
"""
needleLen = len(needle)
# build table of shift amounts
shifts = [1] * (len(needle) + 1)
shifts = [1] * (needleLen + 1)
shift = 1
for pos in range(len(needle)):
for pos in range(needleLen):
while shift <= pos and needle[pos] != needle[pos-shift]:
shift += shifts[pos-shift]
shifts[pos+1] = shift
Expand All @@ -507,12 +508,12 @@ def _kmp(needle, haystack, _dummy): # Knuth-Morris-Pratt search algorithm implem
startPos = 0
matchLen = 0
for c in haystack:
while matchLen == len(needle) or \
while matchLen == needleLen or \
matchLen >= 0 and needle[matchLen] != c:
startPos += shifts[matchLen]
matchLen -= shifts[matchLen]
matchLen += 1
if matchLen == len(needle):
if matchLen == needleLen:
yield startPos


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