iterama/native/skip-async.js

Composable functional (async) iterable helpers

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.skipAsync = void 0;

var _defineProperty2 = _interopRequireDefault(require("@babel/runtime/helpers/defineProperty"));

var _regenerator = _interopRequireDefault(require("@babel/runtime/regenerator"));

var _circularr = _interopRequireDefault(require("circularr"));

var _iterateAsync = require("./iterate-async");

function _createForOfIteratorHelperLoose(o, allowArrayLike) { var it; if (typeof Symbol === "undefined" || o[Symbol.iterator] == null) { if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") { if (it) o = it; var i = 0; return function () { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } it = o[Symbol.iterator](); return it.next.bind(it); }

function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }

function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }

var skipFirstAsync = function skipFirstAsync(n) {
  return function (iterable) {
    return (0, _defineProperty2.default)({}, Symbol.asyncIterator, _regenerator.default.mark(function _callee() {
      var asyncGenerator, i, result, _iterator, _step, value;

      return _regenerator.default.async(function _callee$(_context) {
        while (1) {
          switch (_context.prev = _context.next) {
            case 0:
              asyncGenerator = (0, _iterateAsync.iterateAsync)(iterable);
              i = 0;

            case 2:
              if (!(i < n)) {
                _context.next = 11;
                break;
              }

              _context.next = 5;
              return _regenerator.default.awrap(asyncGenerator.next());

            case 5:
              result = _context.sent;

              if (!result.done) {
                _context.next = 8;
                break;
              }

              return _context.abrupt("break", 11);

            case 8:
              i++;
              _context.next = 2;
              break;

            case 11:
              _iterator = _createForOfIteratorHelperLoose(asyncGenerator);

            case 12:
              if ((_step = _iterator()).done) {
                _context.next = 18;
                break;
              }

              value = _step.value;
              _context.next = 16;
              return value;

            case 16:
              _context.next = 12;
              break;

            case 18:
            case "end":
              return _context.stop();
          }
        }
      }, _callee, null, null, Promise);
    }));
  };
};

var skipLastAsync = function skipLastAsync(n) {
  return function (iterable) {
    return (0, _defineProperty2.default)({}, Symbol.asyncIterator, _regenerator.default.mark(function _callee2() {
      var asyncGenerator, last, i, result, _iterator2, _step2, value;

      return _regenerator.default.async(function _callee2$(_context2) {
        while (1) {
          switch (_context2.prev = _context2.next) {
            case 0:
              asyncGenerator = (0, _iterateAsync.iterateAsync)(iterable);
              last = new _circularr.default(n);
              i = 0;

            case 3:
              if (!(i < n)) {
                _context2.next = 13;
                break;
              }

              _context2.next = 6;
              return _regenerator.default.awrap(asyncGenerator.next());

            case 6:
              result = _context2.sent;

              if (!result.done) {
                _context2.next = 9;
                break;
              }

              return _context2.abrupt("break", 13);

            case 9:
              last.shift(result.value);

            case 10:
              i++;
              _context2.next = 3;
              break;

            case 13:
              _iterator2 = _createForOfIteratorHelperLoose(asyncGenerator);

            case 14:
              if ((_step2 = _iterator2()).done) {
                _context2.next = 20;
                break;
              }

              value = _step2.value;
              _context2.next = 18;
              return last.shift(value);

            case 18:
              _context2.next = 14;
              break;

            case 20:
            case "end":
              return _context2.stop();
          }
        }
      }, _callee2, null, null, Promise);
    }));
  };
};

var skipAsync = function skipAsync(n) {
  return n < 0 ? skipLastAsync(-n) : skipFirstAsync(n);
};

exports.skipAsync = skipAsync;
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