wonka/lib/js/src/operators/wonka_operator_takeUntil.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 takeUntil(notifier) {
  return (function (source) {
      return (function (sink) {
          var state = /* record */[
            /* ended */false,
            /* sourceTalkback */Wonka_helpers.talkbackPlaceholder,
            /* notifierTalkback */Wonka_helpers.talkbackPlaceholder
          ];
          Curry._1(source, (function (signal) {
                  if (typeof signal === "number") {
                    if (state[/* ended */0]) {
                      return /* () */0;
                    } else {
                      state[/* notifierTalkback */2](/* Close */1);
                      state[/* ended */0] = true;
                      return sink(/* End */0);
                    }
                  } else if (signal.tag) {
                    if (state[/* ended */0]) {
                      return /* () */0;
                    } else {
                      return sink(signal);
                    }
                  } else {
                    state[/* sourceTalkback */1] = signal[0];
                    return Curry._1(notifier, (function (signal) {
                                  if (typeof signal === "number") {
                                    return /* () */0;
                                  } else if (signal.tag) {
                                    state[/* ended */0] = true;
                                    state[/* notifierTalkback */2](/* Close */1);
                                    state[/* sourceTalkback */1](/* Close */1);
                                    return sink(/* End */0);
                                  } else {
                                    var innerTb = signal[0];
                                    state[/* notifierTalkback */2] = innerTb;
                                    return innerTb(/* Pull */0);
                                  }
                                }));
                  }
                }));
          return sink(/* Start */Block.__(0, [(function (signal) {
                            if (state[/* ended */0]) {
                              return 0;
                            } else if (signal) {
                              state[/* sourceTalkback */1](/* Close */1);
                              return state[/* notifierTalkback */2](/* Close */1);
                            } else {
                              return state[/* sourceTalkback */1](/* Pull */0);
                            }
                          })]));
        });
    });
}

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