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feat: full memtrie logic for range retain #12130
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,34 @@ | ||
pub(crate) fn hex_to_nibbles(hex: &str) -> Vec<u8> { | ||
if hex == "_" { | ||
return vec![]; | ||
} | ||
assert!(hex.len() % 2 == 0); | ||
hex::decode(hex).unwrap() | ||
} | ||
|
||
pub(crate) fn all_nibbles(hexes: &str) -> Vec<Vec<u8>> { | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. nit: how about something like |
||
hexes.split_whitespace().map(|x| hex_to_nibbles(x)).collect() | ||
} | ||
|
||
pub(crate) fn full_16ary_tree_keys() -> Vec<Vec<u8>> { | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. nit: How about |
||
all_nibbles( | ||
" | ||
00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f | ||
10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f | ||
20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f | ||
30 31 32 33 34 35 36 37 38 39 3a 3b 3c 3d 3e 3f | ||
40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f | ||
50 51 52 53 54 55 56 57 58 59 5a 5b 5c 5d 5e 5f | ||
60 61 62 63 64 65 66 67 68 69 6a 6b 6c 6d 6e 6f | ||
70 71 72 73 74 75 76 77 78 79 7a 7b 7c 7d 7e 7f | ||
80 81 82 83 84 85 86 87 88 89 8a 8b 8c 8d 8e 8f | ||
90 91 92 93 94 95 96 97 98 99 9a 9b 9c 9d 9e 9f | ||
a0 a1 a2 a3 a4 a5 a6 a7 a8 a9 aa ab ac ad ae af | ||
b0 b1 b2 b3 b4 b5 b6 b7 b8 b9 ba bb bc bd be bf | ||
c0 c1 c2 c3 c4 c5 c6 c7 c8 c9 ca cb cc cd ce cf | ||
d0 d1 d2 d3 d4 d5 d6 d7 d8 d9 da db dc dd de df | ||
e0 e1 e2 e3 e4 e5 e6 e7 e8 e9 ea eb ec ed ee ef | ||
f0 f1 f2 f3 f4 f5 f6 f7 f8 f9 fa fb fc fd fe ff | ||
", | ||
) | ||
} |
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Is that right? Hex decodes to bytes but nibbles are half-bytes. I do realize you only moved it and it's probably ok so I'm mostly curious where is the gap in my understanding.
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I think the Robin's assumption was that we can only write actual bytes and we can't write key with odd number of nibbles. Maybe trie internals shouldn't be aware of that; on the other hand, vectors of even lengths cover all cases well.
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I was expecting the bytes to be further split down into nibbles, so something like this:
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No, each string symbol represents a readable nibble (0..9, a..f). I'll add comment