glance-selector/lib/extensions/index.js

Glance selector library

"use strict";

Object.defineProperty(exports, "__esModule", {
    value: true
});

var _arrayUtils = require("../utils/array-utils");

var _log = require("../log");

var _log2 = _interopRequireDefault(_log);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

exports.default = {
    filter: {
        useDefaultFiltersIfFirst: true,
        apply: function apply(_ref) {
            var elements = _ref.elements,
                target = _ref.target;
            var resultHandler = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : function (err, result) {
                return result;
            };

            _log2.default.debug("Filtering by index");

            var attributes = target.properties.filter(function (p) {
                return !isNaN(p);
            });

            if (attributes.length > 0) {
                return (0, _arrayUtils.reduce)(attributes, [], function (result, attribute, callback) {
                    var position = attribute;
                    _log2.default.debug("Selecting the", position, "element out of", elements.length);

                    if (position == null) {
                        return callback(null, result.concat(elements));
                    }

                    if (position <= 0) {
                        console.log("Positions start at 1");
                        return callback("Positions start at 1", result.concat([]));
                    }

                    if (elements.length < position) {
                        console.log("Position " + position + " out of range");
                        return callback("Position " + position + " out of range", result.concat([]));
                    }

                    var i = position - 1;
                    return callback(null, result.concat(elements[i]));
                }, resultHandler);
            }

            return resultHandler(null, elements);
        }
    }
};