glance-dom/javascript/lib/extensions/filters/indexing.js

Glance DOM library

'use strict';

Object.defineProperty(exports, "__esModule", {
	value: true
});
exports.negativeIndex = exports.index = undefined;

var _log = require('../../utils/log');

var _log2 = _interopRequireDefault(_log);

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

var index = {
	filter: {
		check: function check(_ref) {
			var option = _ref.option;

			return option !== null && !isNaN(option) && parseInt(option) > 0;
		},
		filter: function filter(_ref2) {
			var elements = _ref2.elements,
			    option = _ref2.option;

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

			if (option !== null && !isNaN(option)) {
				var position = parseInt(option);
				_log2.default.debug('Selecting the', position, 'element out of', elements.length);

				if (position === 0) {
					throw new Error('Position 0 not supported, must be 1 or greater');
				}

				if (elements.length < position) {
					throw new Error('Position ' + position + ' out of range');
				}

				var i = position - 1;

				return [elements[i]];
			}

			return elements;
		}
	}
};

var negativeIndex = {
	filter: {
		check: function check(_ref3) {
			var option = _ref3.option;

			return option !== null && !isNaN(option) && parseInt(option) < 0;
		},
		filter: function filter(_ref4) {
			var elements = _ref4.elements,
			    option = _ref4.option;

			_log2.default.debug('Filtering by negative index');

			if (option !== null && !isNaN(option)) {
				var position = parseInt(option);
				_log2.default.debug('Selecting the', position, 'element out of', elements.length);

				if (position === 0) {
					throw new Error('Position 0 not supported, must be -1 or lower');
				}

				if (elements.length < Math.abs(position)) {
					throw new Error('Position ' + position + ' out of range');
				}

				var i = position;

				return [elements[elements.length + position]];
			}

			return elements;
		}
	}
};

exports.index = index;
exports.negativeIndex = negativeIndex;