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Bindings to Node.js and browser platform APIs
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src/plinth/browser/geolocation.gleam
import gleam/dynamic
import gleam/javascript/promise
import gleam/option.{type Option}
import gleam/string
pub type JSGeolocationPosition
pub type JSGeolocationPositionError
pub type GeolocationPosition {
GeolocationPosition(
latitude: Float,
longitude: Float,
altitude: Option(Float),
accuracy: Float,
altitude_accuracy: Option(Float),
heading: Option(Float),
speed: Option(Float),
// separate timestamp field in native object
timestamp: Float,
)
}
pub fn decode(raw) {
dynamic.decode8(
GeolocationPosition,
dynamic.field("coords", dynamic.field("latitude", dynamic.float)),
dynamic.field("coords", dynamic.field("longitude", dynamic.float)),
dynamic.field(
"coords",
dynamic.field("altitude", dynamic.optional(dynamic.float)),
),
dynamic.field("coords", dynamic.field("accuracy", dynamic.float)),
dynamic.field(
"coords",
dynamic.field("altitudeAccuracy", dynamic.optional(dynamic.float)),
),
dynamic.field(
"coords",
dynamic.field("heading", dynamic.optional(dynamic.float)),
),
dynamic.field(
"coords",
dynamic.field("speed", dynamic.optional(dynamic.float)),
),
dynamic.field("timestamp", dynamic.float),
)(raw)
}
@external(javascript, "../../geolocation_ffi.mjs", "getCurrentPosition")
pub fn get_current_position(
success: fn(JSGeolocationPosition) -> Nil,
error: fn(JSGeolocationPositionError) -> Nil,
) -> Nil
pub fn current_position() {
promise.new(fn(resolve) {
get_current_position(
fn(position) {
case decode(dynamic.from(position)) {
Ok(position) -> Ok(position)
Error(reason) -> Error(string.inspect(reason))
}
|> resolve()
},
fn(error) { resolve(Error(string.inspect(error))) },
)
})
}