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module Order
export Order(..), reverse/1, to_int/1, compare/2, max/2, min/2
type Order
= LT
| EQ
| GT
fn reverse(order) =
case order
| LT => GT
| EQ => EQ
| GT => LT
test reverse =
reverse(LT) |> Assert.equal(_, GT)
reverse(EQ) |> Assert.equal(_, EQ)
reverse(GT) |> Assert.equal(_, LT)
fn to_int(order) =
case order
| LT => -1
| EQ => 0
| GT => 1
test to_int =
to_int(LT) |> Assert.equal(_, -1)
to_int(EQ) |> Assert.equal(_, 0)
to_int(GT) |> Assert.equal(_, 1)
fn compare(a, b) =
case (a, b)
| (LT, LT) => EQ
| (LT, _) => LT
| (EQ, EQ) => EQ
| (GT, GT) => EQ
| (EQ, GT) => LT
| _ => GT
test compare =
compare(LT, LT) |> Assert.equal(_, EQ)
compare(LT, EQ) |> Assert.equal(_, LT)
compare(LT, GT) |> Assert.equal(_, LT)
compare(EQ, LT) |> Assert.equal(_, GT)
compare(EQ, EQ) |> Assert.equal(_, EQ)
compare(EQ, GT) |> Assert.equal(_, LT)
compare(GT, LT) |> Assert.equal(_, GT)
compare(GT, EQ) |> Assert.equal(_, GT)
compare(GT, GT) |> Assert.equal(_, EQ)
fn max(a, b) =
case (a, b)
| (GT, _) => GT
| (EQ, LT) => EQ
| _ => b
test max =
max(LT, LT) |> Assert.equal(_, LT)
max(LT, EQ) |> Assert.equal(_, EQ)
max(LT, GT) |> Assert.equal(_, GT)
max(EQ, LT) |> Assert.equal(_, EQ)
max(EQ, EQ) |> Assert.equal(_, EQ)
max(EQ, GT) |> Assert.equal(_, GT)
max(GT, LT) |> Assert.equal(_, GT)
max(GT, EQ) |> Assert.equal(_, GT)
max(GT, GT) |> Assert.equal(_, GT)
fn min(a, b) =
case (a, b)
| (LT, _) => LT
| (EQ, GT) => EQ
| _ => b
test min =
min(LT, LT) |> Assert.equal(_, LT)
min(LT, EQ) |> Assert.equal(_, LT)
min(LT, GT) |> Assert.equal(_, LT)
min(EQ, LT) |> Assert.equal(_, LT)
min(EQ, EQ) |> Assert.equal(_, EQ)
min(EQ, GT) |> Assert.equal(_, EQ)
min(GT, LT) |> Assert.equal(_, LT)
min(GT, EQ) |> Assert.equal(_, EQ)
min(GT, GT) |> Assert.equal(_, GT)
|
