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(.module:
[lux (#- not and or)
[abstract
[equivalence (#+ Equivalence)]]
[control
pipe]
[data
["." maybe]
[number
["." i64]
["n" nat]]
[collection
["." array (#+ Array) ("#@." fold)]]]])
(type: #export Chunk
I64)
(def: #export chunk-size
i64.width)
(type: #export Bits
(Array Chunk))
(def: empty-chunk
Chunk
(.i64 0))
(def: #export empty
Bits
(array.new 0))
(def: #export (size bits)
(-> Bits Nat)
(array@fold (function (_ chunk total)
(|> chunk i64.count (n.+ total)))
0
bits))
(def: #export (capacity bits)
(-> Bits Nat)
(|> bits array.size (n.* chunk-size)))
(def: #export empty?
(-> Bits Bit)
(|>> size (n.= 0)))
(def: #export (get index bits)
(-> Nat Bits Bit)
(let [[chunk-index bit-index] (n./% chunk-size index)]
(.and (n.< (array.size bits) chunk-index)
(|> (array.read chunk-index bits)
(maybe.default empty-chunk)
(i64.set? bit-index)))))
(def: (chunk idx bits)
(-> Nat Bits Chunk)
(if (n.< (array.size bits) idx)
(|> bits (array.read idx) (maybe.default empty-chunk))
empty-chunk))
(template [<name> <op>]
[(def: #export (<name> index input)
(-> Nat Bits Bits)
(let [[chunk-index bit-index] (n./% chunk-size index)]
(loop [size|output (n.max (inc chunk-index)
(array.size input))
output ..empty]
(let [idx|output (dec size|output)]
(if (n.> 0 size|output)
(case (|> (..chunk idx|output input)
(cond> [(new> (n.= chunk-index idx|output) [])]
[(<op> bit-index)]
## else
[])
.nat)
0
## TODO: Remove 'no-op' once new-luxc is the official compiler.
(let [no-op (recur (dec size|output) output)]
no-op)
chunk
(|> (if (is? ..empty output)
(: Bits (array.new size|output))
output)
(array.write! idx|output (.i64 chunk))
(recur (dec size|output))))
output)))))]
[set i64.set]
[clear i64.clear]
[flip i64.flip]
)
(def: #export (intersects? reference sample)
(-> Bits Bits Bit)
(let [chunks (n.min (array.size reference)
(array.size sample))]
(loop [idx 0]
(if (n.< chunks idx)
(.or (|> (..chunk idx sample)
(i64.and (..chunk idx reference))
("lux i64 =" empty-chunk)
.not)
(recur (inc idx)))
#0))))
(def: #export (not input)
(-> Bits Bits)
(case (array.size input)
0
..empty
size|output
(loop [size|output size|output
output ..empty]
(let [idx (dec size|output)]
(case (|> input (..chunk idx) i64.not .nat)
0
(recur (dec size|output) output)
chunk
(if (n.> 0 size|output)
(|> (if (is? ..empty output)
(: Bits (array.new size|output))
output)
(array.write! idx (.i64 chunk))
(recur (dec size|output)))
output))))))
(template [<name> <op>]
[(def: #export (<name> param subject)
(-> Bits Bits Bits)
(case (n.max (array.size param)
(array.size subject))
0
..empty
size|output
(loop [size|output size|output
output ..empty]
(let [idx (dec size|output)]
(if (n.> 0 size|output)
(case (|> (..chunk idx subject)
(<op> (..chunk idx param))
.nat)
0
(recur (dec size|output) output)
chunk
(|> (if (is? ..empty output)
(: Bits (array.new size|output))
output)
(array.write! idx (.i64 chunk))
(recur (dec size|output))))
output)))))]
[and i64.and]
[or i64.or]
[xor i64.xor]
)
(structure: #export equivalence
(Equivalence Bits)
(def: (= reference sample)
(let [size (n.max (array.size reference)
(array.size sample))]
(loop [idx 0]
(if (n.< size idx)
(.and ("lux i64 ="
(..chunk idx reference)
(..chunk idx sample))
(recur (inc idx)))
#1)))))
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