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(;module:
lux
(lux (control [monad #+ do Monad]
["p" parser "p/" Monad<Parser>]
[eq #+ Eq]
[order #+ Order]
[enum #+ Enum])
(data text/format
(number ["r" ratio]))
[meta]
(meta [code]
["s" syntax #+ syntax:]
(syntax ["cs" common]
(common ["csr" reader]
["csw" writer])))))
(type: #export (Qty unit)
[Int unit])
(sig: #export (Scale s)
(: (All [u] (-> (Qty u) (Qty (s u))))
scale)
(: (All [u] (-> (Qty (s u)) (Qty u)))
de-scale)
(: r;Ratio
ratio))
(type: #export Pure
(Qty []))
(type: #export (Per d n)
(-> d n))
(type: #export (Inverse u)
(|> Pure (Per u)))
(type: #export (Product p s)
(|> s (Per (Inverse p))))
(def: #export (in carrier magnitude)
(All [unit] (-> unit Int (Qty unit)))
[magnitude carrier])
(def: #export (pure magnitude)
(-> Int Pure)
(in [] magnitude))
(def: #export (out quantity)
(All [unit] (-> (Qty unit) Int))
(let [[magnitude carrier] quantity]
magnitude))
(def: (carrier quantity)
(All [unit] (-> (Qty unit) unit))
(let [[magnitude carrier] quantity]
carrier))
(do-template [<name> <tag>]
[(def: <name>
(-> Text Text)
(|>. (format "{" kind "@" module "}")
(let [[module kind] (ident-for <tag>)])))]
[unit-name #;;Unit]
[scale-name #;;Scale]
)
(syntax: #export (unit: [export csr;export]
[name s;local-symbol]
[annotations (p;default cs;empty-annotations csr;annotations)])
(wrap (list (` (type: (~@ (csw;export export)) (~ (code;local-symbol name))
(~ (csw;annotations annotations))
(primitive (~ (code;local-symbol (unit-name name))))))
(` (def: (~@ (csw;export export)) (~ (code;local-symbol (format "@" name)))
(~ (code;local-symbol name))
(:!! [])))
)))
(def: ratio^
(s;Syntax r;Ratio)
(s;tuple (do p;Monad<Parser>
[numerator s;int
_ (p;assert (format "Numerator must be positive: " (%i numerator))
(i.> 0 numerator))
denominator s;int
_ (p;assert (format "Denominator must be positive: " (%i denominator))
(i.> 0 denominator))]
(wrap [(int-to-nat numerator) (int-to-nat denominator)]))))
(syntax: #export (scale: [export csr;export]
[name s;local-symbol]
[(^slots [#r;numerator #r;denominator]) ratio^]
[annotations (p;default cs;empty-annotations csr;annotations)])
(let [g!scale (code;local-symbol name)]
(wrap (list (` (type: (~@ (csw;export export)) ((~ g!scale) (~' u))
(~ (csw;annotations annotations))
(primitive (~ (code;local-symbol (scale-name name))) [(~' u)])))
(` (struct: (~@ (csw;export export)) (~ (code;local-symbol (format "@" name)))
(;;Scale (~ g!scale))
(def: (~' scale)
(|>. ;;out
(i.* (~ (code;int (nat-to-int numerator))))
(i./ (~ (code;int (nat-to-int denominator))))
(;;in (:! ((~ g!scale) ($ +0)) []))))
(def: (~' de-scale)
(|>. ;;out
(i.* (~ (code;int (nat-to-int denominator))))
(i./ (~ (code;int (nat-to-int numerator))))
(;;in (:! ($ +0) []))))
(def: (~' ratio)
[(~ (code;nat numerator)) (~ (code;nat denominator))])))
))))
(do-template [<name> <op>]
[(def: #export (<name> param subject)
(All [unit] (-> (Qty unit) (Qty unit) (Qty unit)))
(|> (out subject) (<op> (out param)) (in (carrier subject))))]
[++ i.+]
[-- i.-]
)
(def: #export (// param subject)
(All [p s] (-> (Qty p) (Qty s) (|> (Qty s) (Per (Qty p)))))
(function [input]
(|> (out subject)
(i.* (out input))
(i./ (out param))
(in (carrier subject)))))
(def: #export (** param subject)
(All [p s] (-> (Qty p) (Qty s) (Product (Qty p) (Qty s))))
(function [input]
(|> (out subject)
(i.* (out (input param)))
(in (carrier subject)))))
(def: #export (re-scale from to quantity)
(All [si so u] (-> (Scale si) (Scale so) (Qty (si u)) (Qty (so u))))
(let [[numerator denominator] (|> (:: to ratio) (r;q./ (:: from ratio)))]
(|> quantity out
(i.* (nat-to-int numerator))
(i./ (nat-to-int denominator))
(in (:! (($ +1) ($ +2)) [])))))
(scale: #export Kilo [1 1_000])
(scale: #export Mega [1 1_000_000])
(scale: #export Giga [1 1_000_000_000])
(scale: #export Milli [ 1_000 1])
(scale: #export Micro [ 1_000_000 1])
(scale: #export Nano [1_000_000_000 1])
(def: #export (as scale unit magnitude)
(All [s u] (-> (Scale s) u Int (Qty (s u))))
(let [[_ carrier] (|> 0 (in unit) (:: scale scale))]
[magnitude carrier]))
(unit: #export Gram)
(unit: #export Meter)
(unit: #export Litre)
(unit: #export Second)
(struct: #export Eq<Unit> (All [unit] (Eq (Qty unit)))
(def: (= reference sample)
(i.= (out reference) (out sample))))
(struct: #export Order<Unit> (All [unit] (Order (Qty unit)))
(def: eq Eq<Unit>)
(do-template [<name> <func>]
[(def: (<name> reference sample)
(<func> (out reference) (out sample)))]
[< i.<]
[<= i.<=]
[> i.>]
[>= i.>=]))
(struct: #export Enum<Unit> (All [unit] (Enum (Qty unit)))
(def: order Order<Unit>)
(def: (succ qty) (|> (out qty) i.inc (in (carrier qty))))
(def: (pred qty) (|> (out qty) i.dec (in (carrier qty)))))
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