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(;module: [lux #- and or not])
(def: #export width Nat +64)
## [Values]
(do-template [<short-name> <op> <doc> <type>]
[(def: #export (<short-name> param subject)
{#;doc <doc>}
(-> Nat <type> <type>)
(_lux_proc ["bit" <op>] [subject param]))]
[and "and" "Bitwise and." Nat]
[or "or" "Bitwise or." Nat]
[xor "xor" "Bitwise xor." Nat]
[shift-left "shift-left" "Bitwise shift-left." Nat]
[shift-right "shift-right" "Bitwise shift-right." Int]
[unsigned-shift-right "unsigned-shift-right" "Bitwise unsigned-shift-right." Nat]
)
(def: #export (count subject)
{#;doc "Count the number of 1s in a bit-map."}
(-> Nat Nat)
(_lux_proc ["bit" "count"] [subject]))
(def: #export not
{#;doc "Bitwise negation."}
(-> Nat Nat)
(let [mask (int-to-nat -1)]
(xor mask)))
(def: #export (clear idx input)
{#;doc "Clear bit at given index."}
(-> Nat Nat Nat)
(;;and (;;not (shift-left idx +1))
input))
(do-template [<name> <op> <doc>]
[(def: #export (<name> idx input)
{#;doc <doc>}
(-> Nat Nat Nat)
(<op> (shift-left idx +1) input))]
[set ;;or "Set bit at given index."]
[flip ;;xor "Flip bit at given index."]
)
(def: #export (set? idx input)
(-> Nat Nat Bool)
(|> input (;;and (shift-left idx +1)) (n.= +0) ;not))
(do-template [<name> <main> <comp>]
[(def: #export (<name> distance input)
(-> Nat Nat Nat)
(;;or (<main> distance input)
(<comp> (n.- (n.% width distance)
width)
input)))]
[rotate-left shift-left unsigned-shift-right]
[rotate-right unsigned-shift-right shift-left]
)
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