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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 any.gleam
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src/gleam/any.gleam 

import gleam/list as list_mod

import gleam/atom

import gleam/result



// `Any` 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 Any;



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

//

pub external fn from(a) -> Any = "gleam__stdlib" "identity";



// Unsafely cast any type 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(Any) -> Result(String, String)

  = "gleam__stdlib" "decode_string"



pub external fn int(Any) -> Result(Int, String)

  = "gleam__stdlib" "decode_int"



pub external fn float(Any) -> Result(Float, String)

  = "gleam__stdlib" "decode_float"



pub external fn atom(Any) -> Result(atom:Atom, String)

  = "gleam__stdlib" "decode_atom"



pub external fn bool(Any) -> Result(Bool, String)

  = "gleam__stdlib" "decode_bool"



pub external fn thunk(Any) -> Result(fn() -> Any, String)

  = "gleam__stdlib" "decode_thunk"



external fn list_any(Any) -> Result(List(Any), String) =

  "gleam__stdlib" "decode_list"



pub fn list(any, decode) {

  any

  |> list_any

  |> result:then(_, list_mod:traverse(_, decode))

}



pub external fn tuple(Any) -> Result({Any, Any}, String)

  = "gleam__stdlib" "decode_tuple"



pub external fn field(Any, a) -> Result(Any, String)

  = "gleam__stdlib" "decode_field"