@dillonkearns/elm-graphql/examples/src/subscription/node_modules/flow-static-land/lib/Yoneda.js

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'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.inj = inj;
exports.prj = prj;
exports.runYoneda = runYoneda;
exports.liftYoneda = liftYoneda;
exports.lowerYoneda = lowerYoneda;
exports.map = map;

var _HKT = require('./HKT');

var _Fun = require('./Fun');

var _Identity = require('./Identity');

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

/*

  The Yoneda `Functor`

  `Yoneda f` is a `Functor` for any type constructor `f`.

  Implementation based on the purescript-free package (https://github.com/purescript/purescript-free)

*/

var IsYoneda = function IsYoneda() {
  _classCallCheck(this, IsYoneda);
};

function inj(a) {
  return a;
}

function prj(fa) {
  return fa;
}

/* Run a computation of type `Yoneda f a`. */
function runYoneda(y, f) {
  return prj(y)(f);
}

/* Lift a value described by the `Functor` `f` to the `Functor` `Yoneda f`. */
function liftYoneda(functor, fa) {
  return inj(function (k) {
    return functor.map(k, fa);
  });
}

/* Lower a value of type `Yoneda f a` to the type constructor `f`. */
function lowerYoneda(y) {
  return runYoneda(y, _Identity.id);
}

function map(f, y) {
  return inj(function (k) {
    return runYoneda(y, (0, _Fun.compose)(k, f));
  });
}

if (false) {
  // eslint-disable-line
  ({
    map: map
  });
}