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More sophisticated makeFromYear function, that accepts floats

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This commit is contained in:
Ozzie Gooen 2022-05-22 21:57:13 -04:00
parent f1d2a1a12f
commit fff2f5da59
2 changed files with 19 additions and 13 deletions
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2
packages/squiggle-lang/src/rescript/ReducerInterface/ReducerInterface_DateTime.res
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@ -7,7 +7,7 @@ let dateDispatch = (call: ExpressionValue.functionCall, env: DistributionOperati
switch call {
| ("toString", [EvDate(t)]) => EvString(E.Date.toString(t))->Ok->Some
| ("makeDateFromYear", [EvNumber(year)]) =>
switch E.Date.makeWithYear(Belt.Float.toInt(year)) {
switch E.Date.makeFromYear(year) {
| Ok(t) => EvDate(t)->Ok->Some
| Error(e) => RETodo(e)->Error->Some
}

30
packages/squiggle-lang/src/rescript/Utility/E.res
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@ -873,18 +873,6 @@ module Date = {
type t = Js.Date.t
let toFloat = Js.Date.getTime
let getFullYear = Js.Date.getFullYear
//The Js.Date.makeWithYM function accepts a float, but only treats it as a whole number.
//Our version takes an integer to make this distinction clearer.
let makeWithYear = (y: int): result<t, string> => {
if y < 100 {
Error("Year must be over 100")
} else if y > 200000 {
Error("Year must be less than 200000")
} else {
Ok(Js.Date.makeWithYM(~year=Belt.Float.fromInt(y), ~month=0.0, ()))
}
}
let toString = Js.Date.toDateString
let fromFloat = Js.Date.fromFloat
let fmap = (t: t, fn: float => float) => t->toFloat->fn->fromFloat
@ -899,4 +887,22 @@ module Date = {
}
let addDuration = (t: t, duration: Duration.t) => fmap(t, t => t +. duration)
let subtractDuration = (t: t, duration: Duration.t) => fmap(t, t => t -. duration)
//The Js.Date.makeWithYM function accepts a float, but only treats it as a whole number.
//Our version takes an integer to make this distinction clearer.
let makeWithYearInt = (y: int): result<t, string> => {
if y < 100 {
Error("Year must be over 100")
} else if y > 200000 {
Error("Year must be less than 200000")
} else {
Ok(Js.Date.makeWithYM(~year=Belt.Float.fromInt(y), ~month=0.0, ()))
}
}
let makeFromYear = (year: float): result<t, string> => {
let floor = year -> Js.Math.floor_float
makeWithYearInt(Belt.Float.toInt(floor))->R2.fmap(earlyDate => {
let diff = year -. floor
earlyDate->addDuration(diff *. Duration.year)
})
}
}