wonka/lib/js/src/operators/wonka_operator_share.js

A fast push & pull stream library for Reason, loosely following the [callbag spec](https://github.com/callbag/callbag)

'use strict';

var Block = require("bs-platform/lib/js/block.js");
var Curry = require("bs-platform/lib/js/curry.js");
var Wonka_helpers = require("../wonka_helpers.js");

function share(source) {
  var state = /* record */[
    /* sinks */new Array(),
    /* talkback */Wonka_helpers.talkbackPlaceholder,
    /* gotSignal */false
  ];
  return (function (sink) {
      state[/* sinks */0] = state[/* sinks */0].concat(sink);
      if (state[/* sinks */0].length === 1) {
        Curry._1(source, (function (signal) {
                if (typeof signal === "number") {
                  state[/* sinks */0].forEach((function (sink) {
                          return sink(/* End */0);
                        }));
                  state[/* sinks */0] = new Array();
                  return /* () */0;
                } else if (signal.tag) {
                  state[/* gotSignal */2] = false;
                  state[/* sinks */0].forEach((function (sink) {
                          return sink(signal);
                        }));
                  return /* () */0;
                } else {
                  state[/* talkback */1] = signal[0];
                  return /* () */0;
                }
              }));
      }
      return sink(/* Start */Block.__(0, [(function (signal) {
                        if (signal) {
                          state[/* sinks */0] = state[/* sinks */0].filter((function (x) {
                                  return x !== sink;
                                }));
                          if (state[/* sinks */0].length === 0) {
                            return state[/* talkback */1](/* Close */1);
                          } else {
                            return 0;
                          }
                        } else if (state[/* gotSignal */2]) {
                          return /* () */0;
                        } else {
                          state[/* gotSignal */2] = true;
                          return state[/* talkback */1](signal);
                        }
                      })]));
    });
}

exports.share = share;
/* No side effect */