2013-06-27 11:15:29 +02:00
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#!/usr/bin/env python
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# Generate youtube signature algorithm from test cases
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import sys
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tests = [
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("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!@#$%^&*()_-+={[]}|:;?/>.<",
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"J:|}][{=+-_)(*&;%$#@>MNBVCXZASDFGH^KLPOIUYTREWQ0987654321mnbvcxzasdfghrklpoiuytej"),
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("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!@#$^&*()_-+={[]}|:;?/>.<",
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"!?;:|}][{=+-_)(*&^$#@/MNBVCXZASqFGHJKLPOIUYTREWQ0987654321mnbvcxzasdfghjklpoiuytr"),
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("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!@#$%^&*()_-+={[|};?/>.<",
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2013-06-27 12:24:46 +02:00
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"ertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!/#$%^&*()_-+={[|};?@"),
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2013-06-27 11:15:29 +02:00
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("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!@#$%^&*()_-+={[};?/>.<",
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"{>/?;}[.=+-_)(*&^%$#@!MqBVCXZASDFwHJKLPOIUYTREWQ0987654321mnbvcxzasdfghjklpoiuytr"),
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("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!@#$%^&*()_-+={[};?>.<",
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"<.>?;}[{=+-_)(*&^%$#@!MNBVCXZASDFGHJKLPOIUYTREWe098765432rmnbvcxzasdfghjklpoiuyt1"),
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("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKJHGFDSAZXCVBNM!#$%^&*()_+={[};?/>.<",
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"D.>/?;}[{=+_)(*&^%$#!MNBVCXeAS<FGHJKLPOIUYTREWZ0987654321mnbvcxzasdfghjklpoiuytrQ"),
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("qwertyuioplkjhgfdsazxcvbnm1234567890QWERTYUIOPLKHGFDSAZXCVBNM!@#$%^&*(-+={[};?/>.<",
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"Q>/?;}[{=+-(*<^%$#@!MNBVCXZASDFGHKLPOIUY8REWT0q&7654321mnbvcxzasdfghjklpoiuytrew9"),
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]
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def find_matching(wrong, right):
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idxs = [wrong.index(c) for c in right]
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return compress(idxs)
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return ('s[%d]' % i for i in idxs)
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def compress(idxs):
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def _genslice(start, end, step):
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starts = '' if start == 0 else str(start)
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ends = ':%d' % (end+step)
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steps = '' if step == 1 else (':%d' % step)
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return 's[%s%s%s]' % (starts, ends, steps)
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step = None
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for i, prev in zip(idxs[1:], idxs[:-1]):
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if step is not None:
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if i - prev == step:
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continue
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yield _genslice(start, prev, step)
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step = None
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continue
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if i - prev in [-1, 1]:
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step = i - prev
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start = prev
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continue
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else:
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yield 's[%d]' % prev
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if step is None:
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yield 's[%d]' % i
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else:
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yield _genslice(start, i, step)
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def _assert_compress(inp, exp):
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res = list(compress(inp))
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if res != exp:
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print('Got %r, expected %r' % (res, exp))
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assert res == exp
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_assert_compress([0,2,4,6], ['s[0]', 's[2]', 's[4]', 's[6]'])
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_assert_compress([0,1,2,4,6,7], ['s[:3]', 's[4]', 's[6:8]'])
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_assert_compress([8,0,1,2,4,7,6,9], ['s[8]', 's[:3]', 's[4]', 's[7:5:-1]', 's[9]'])
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def gen(wrong, right, indent):
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code = ' + '.join(find_matching(wrong, right))
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return 'if len(s) == %d:\n%s return %s\n' % (len(wrong), indent, code)
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def genall(tests):
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indent = ' ' * 8
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return indent + (indent + 'el').join(gen(wrong, right, indent) for wrong,right in tests)
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def main():
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print(genall(tests))
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if __name__ == '__main__':
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main()
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