wonka/lib/js/src/operators/wonka_operator_takeLast.js

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

'use strict';

var Wonka_helpers = require("../wonka_helpers.js");

function takeLast(max) {
  return (function (source) {
      return (function (sink) {
          var queue = new Array();
          return Wonka_helpers.captureTalkback(source, (function (signal, talkback) {
                        if (typeof signal === "number") {
                          return Wonka_helpers.makeTrampoline(sink, (function () {
                                        return queue.shift();
                                      }));
                        } else if (signal.tag) {
                          var size = queue.length;
                          if (size >= max && max > 0) {
                            queue.shift();
                          }
                          queue.push(signal[0]);
                          return talkback(/* Pull */0);
                        } else {
                          return talkback(/* Pull */0);
                        }
                      }));
        });
    });
}

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