aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorEduardo Julian2017-07-25 21:55:13 -0400
committerEduardo Julian2017-07-25 21:55:13 -0400
commitb10a51698878ea6cfff011b6b3c07d443ce8f62f (patch)
tree05b66dfd6c41862ecb351f0ccdf5c5f3c5c18215
parentcbe57e2eb5ae4c8050c003662cad40e69ac63e01 (diff)
- Improved re-scaling logic and added some SI units.
Diffstat (limited to '')
-rw-r--r--stdlib/source/lux/type/unit.lux40
1 files changed, 26 insertions, 14 deletions
diff --git a/stdlib/source/lux/type/unit.lux b/stdlib/source/lux/type/unit.lux
index e3736cf76..14c1edbce 100644
--- a/stdlib/source/lux/type/unit.lux
+++ b/stdlib/source/lux/type/unit.lux
@@ -2,7 +2,8 @@
lux
(lux (control [monad #+ do Monad]
["p" parser "p/" Monad<Parser>])
- (data text/format)
+ (data text/format
+ (number ["r" ratio]))
[macro]
(macro [code]
["s" syntax #+ syntax:]
@@ -17,7 +18,9 @@
(: (All [u] (-> (Qty u) (Qty (s u))))
scale)
(: (All [u] (-> (Qty (s u)) (Qty u)))
- de-scale))
+ de-scale)
+ (: r;Ratio
+ ratio))
(type: #export Pure
(Qty []))
@@ -44,7 +47,7 @@
(let [[magnitude carrier] quantity]
magnitude))
-(def: #hidden (carrier quantity)
+(def: (carrier quantity)
(All [unit] (-> (Qty unit) unit))
(let [[magnitude carrier] quantity]
carrier))
@@ -69,7 +72,7 @@
)))
(def: ratio^
- (s;Syntax [Int Int])
+ (s;Syntax r;Ratio)
(s;tuple (do p;Monad<Parser>
[numerator s;int
_ (p;assert (format "Numerator must be positive: " (%i numerator))
@@ -77,11 +80,11 @@
denominator s;int
_ (p;assert (format "Denominator must be positive: " (%i denominator))
(i.> 0 denominator))]
- (wrap [numerator denominator]))))
+ (wrap [(int-to-nat numerator) (int-to-nat denominator)]))))
(syntax: #export (scale: [export csr;export]
[name s;local-symbol]
- [[numerator denominator] ratio^])
+ [(^slots [#r;numerator #r;denominator]) ratio^])
(let [g!scale (code;local-symbol name)]
(wrap (list (` (type: (~@ (csw;export export)) ((~ g!scale) (~' u))
(host (~ (code;local-symbol (scale-name name))) [(~' u)])))
@@ -89,14 +92,16 @@
(;;Scale (~ g!scale))
(def: (~' scale)
(|>. ;;out
- (i.* (~ (code;int numerator)))
- (i./ (~ (code;int denominator)))
+ (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 denominator)))
- (i./ (~ (code;int numerator)))
- (;;in (:! ($ +0) []))))))
+ (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>]
@@ -125,9 +130,11 @@
(def: #export (re-scale from to quantity)
(All [si so u] (-> (Scale si) (Scale so) (Qty (si u)) (Qty (so u))))
- (|> quantity
- (:: from de-scale)
- (:: to scale)))
+ (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])
@@ -141,3 +148,8 @@
(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)