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gleam_stdlib

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A standard library for the Gleam programming language

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gleam_stdlib src gleam dynamic.gleam
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src/gleam/dynamic.gleam 

import gleam/list as list_mod

import gleam/atom

import gleam/result



// `Dynamic` data is data that we don"t know the type of yet.

// We likely get data like this from interop with Erlang, or from

// IO with the outside world.

//

pub external type Dynamic;



// Convert any Gleam data into `Dynamic` data.

//

pub external fn from(a) -> Dynamic = "gleam_stdlib" "identity";



// Unsafely cast a Dynamic value into any other type.

//

// This is an escape hatch for the type system that may be useful when wrapping

// native Erlang APIs. It is to be used as a last measure only.

//

pub external fn unsafe_coerce(a) -> b = "gleam_stdlib" "identity";



pub external fn string(from: Dynamic) -> Result(String, String)

  = "gleam_stdlib" "decode_string"



pub external fn int(from: Dynamic) -> Result(Int, String)

  = "gleam_stdlib" "decode_int"



pub external fn float(from: Dynamic) -> Result(Float, String)

  = "gleam_stdlib" "decode_float"



pub external fn atom(from: Dynamic) -> Result(atom.Atom, String)

  = "gleam_stdlib" "decode_atom"



pub external fn bool(from: Dynamic) -> Result(Bool, String)

  = "gleam_stdlib" "decode_bool"



pub external fn thunk(from: Dynamic) -> Result(fn() -> Dynamic, String)

  = "gleam_stdlib" "decode_thunk"



external fn list_dynamic(from: Dynamic) -> Result(List(Dynamic), String)

  = "gleam_stdlib" "decode_list"



pub fn list(from dynamic, containing decoder_type) {

  dynamic

  |> list_dynamic

  |> result.then(_, list_mod.traverse(_, decoder_type))

}



pub external fn field(from: Dynamic, named: a) -> Result(Dynamic, String)

  = "gleam_stdlib" "decode_field"