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|
import any
import result
import expect
pub external type Map(key, value);
pub external fn size(Map(k, v)) -> Int
= "maps" "size"
pub external fn to_list(Map(key, value)) -> List({key, value})
= "maps" "to_list"
pub external fn from_list(List({key, value})) -> Map(key, value)
= "maps" "from_list"
test from_list {
let proplist = [
{4, 0},
{1, 0},
]
let map = from_list(proplist)
map
|> size
|> expect:equal(_, 2)
}
external fn is_key(key, Map(key, v)) -> Bool
= "maps" "is_key"
pub fn has_key(map, key) {
is_key(key, map)
}
test has_key {
let _ = []
|> from_list
|> has_key(_, 1)
|> expect:false
let _ = [
{1, 0},
]
|> from_list
|> has_key(_, 1)
|> expect:true
let _ = [
{4, 0},
{1, 0},
]
|> from_list
|> has_key(_, 1)
|> expect:true
[
{4, 0},
{1, 0},
]
|> from_list
|> has_key(_, 0)
|> expect:false
}
pub external fn new() -> Map(key, value)
= "maps" "new"
test new {
let _ = new()
|> size
|> expect:equal(_, 0)
new()
|> to_list
|> expect:equal(_, [])
}
// pub fn from_record(record: {r | }) -> Map(Atom, any:Any) {
// any:unsafeCoerce(record)
// }
// test from_record {
// let map = from_record({ name = "Jane" })
// let _ = map
// |> size
// |> expect:equal(_, 1)
// map
// |> expect:equal(_, from_list([{"name", "Jane"}]))
// }
pub external fn fetch(Map(key, value), key) -> Result(a, value)
= "gleam__stdlib" "map_fetch";
test fetch {
let proplist = [
{4, 0},
{1, 1},
]
let map = from_list(proplist)
let _ = map
|> fetch(_, 4)
|> expect:equal(_, Ok(0))
map
|> fetch(_, 1)
|> expect:equal(_, Ok(1))
// map
// |> fetch(_, 2)
// |> expect:equal(_, Error(())
}
external fn erl_put(key, value, Map(key, value)) -> Map(key, value)
= "maps" "put";
pub fn put(map, key, value) {
erl_put(key, value, map)
}
test put {
new()
|> put(_, "a", 0)
|> put(_, "b", 1)
|> put(_, "c", 2)
|> expect:equal(_, from_list([{"a", 0}, {"b", 1}, {"c", 2}]))
}
external fn erl_map_values(fn(key, value) -> value, Map(key, value)) -> Map(key, value)
= "maps" "map";
pub fn map_values(map, fun) {
erl_map_values(fun, map)
}
test map_values {
[
{1, 0},
{2, 1},
{3, 2},
]
|> from_list
|> map_values(_, fn(k, v) { k + v })
|> expect:equal(_, from_list([{1, 1}, {2, 3}, {3, 5}]))
}
pub external fn keys(Map(keys, v)) -> List(keys)
= "maps" "keys"
test keys {
[
{"a", 0},
{"b", 1},
{"c", 2},
]
|> from_list
|> keys
|> expect:equal(_, ["a", "b", "c"])
}
pub external fn values(Map(k, values)) -> List(values)
= "maps" "values"
test values {
[
{"a", 0},
{"b", 1},
{"c", 2},
]
|> from_list
|> values
|> expect:equal(_, [0, 1, 2])
}
external fn erl_filter(fn(key, value) -> Bool, Map(key, value)) -> Map(key, value)
= "maps" "filter";
pub fn filter(map, fun) {
erl_filter(fun, map)
}
|
