66 lines
1.9 KiB
Fennel
66 lines
1.9 KiB
Fennel
(fn merge [table1 table2]
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(collect [k v (pairs table2) &into table1]
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k v))
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(fn dup [table]
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(collect [k v (pairs table)] k v))
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(fn split [sep string]
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(icollect [v (string.gmatch string (.. "([^" sep "]+)"))]
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v))
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(fn file-exists? [name]
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(match (io.open name :r)
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f (do (f:close) true)
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_ false))
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(fn system [s]
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(match (os.execute s)
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res (do (print (.. "Executed \"" s "\", exit code " (tostring res))) res)
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(nil err) (error (.. "Error executing \"" s "\" (" err ")"))))
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(fn hash [str]
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(accumulate [h 5381
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c (str:gmatch ".")]
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(+ (* h 33) (string.byte c))))
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(local
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base64-indices
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(doto [
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"B" "C" "D" "E" "F" "G" "H" "I" "J" "K" "L" "M" "N" "O" "P"
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"Q" "R" "S" "T" "U" "V" "W" "X" "Y" "Z" "a" "b" "c" "d" "e" "f"
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"g" "h" "i" "j" "k" "l" "m" "n" "o" "p" "q" "r" "s" "t" "u" "v"
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"w" "x" "y" "z" "0" "1" "2" "3" "4" "5" "6" "7" "8" "9" "-" "_"
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]
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(tset 0 "A")))
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;; local function base64(s)
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;; local byte, rep = string.byte, string.rep
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;; local pad = 2 - ((#s-1) % 3)
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;; s = (s..rep('\0', pad)):gsub("...", function(cs)
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;; local a, b, c = byte(cs, 1, 3)
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;; return bs[a>>2] .. bs[(a&3)<<4|b>>4] .. bs[(b&15)<<2|c>>6] .. bs[c&63]
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;; end)
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;; return s:sub(1, #s-pad) .. rep('=', pad)
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;; end
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(fn base64url [s]
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"URL-safe Base64-encoded form of s (no trailing padding)"
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(let [pad (- 2 (% (- (# s) 1) 3))
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bs base64-indices
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blank (string.rep "\0" pad)
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s (-> (.. s blank)
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(: :gsub
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"..."
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(fn [cs]
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(let [(a b c) (string.byte cs 1 3)]
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(.. (. bs (rshift a 2))
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(. bs (bor (lshift (band a 3) 4) (rshift b 4)))
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(. bs (bor (lshift (band b 15) 2) (rshift c 6)))
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(. bs (band c 63)))))))]
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(s:sub 1 (- (# s) pad))))
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{ : merge : split : file-exists? : system : hash : base64url : dup }
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