kepler.gl/src/common-utils/dist/data.js

kepler.gl is a webgl based application to visualize large scale location data in the browser

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.containValidTime = containValidTime;
exports.isHexWkb = isHexWkb;
exports.notNullorUndefined = notNullorUndefined;
exports.toArray = toArray;
var _typeAnalyzer = require("type-analyzer");
// SPDX-License-Identifier: MIT
// Copyright contributors to the kepler.gl project

function notNullorUndefined(d) {
  return d !== undefined && d !== null;
}

/**
 * Check if string is a valid Well-known binary (WKB) in HEX format
 * https://en.wikipedia.org/wiki/Well-known_text_representation_of_geometry
 *
 * @param str input string
 * @returns true if string is a valid WKB in HEX format
 */
function isHexWkb(str) {
  if (!str) return false;
  // check if the length of the string is even and is at least 10 characters long
  if (str.length < 10 || str.length % 2 !== 0) {
    return false;
  }
  // check if first two characters are 00 or 01
  if (!str.startsWith('00') && !str.startsWith('01')) {
    return false;
  }
  // check if the rest of the string is a valid hex
  return /^[0-9a-fA-F]+$/.test(str.slice(2));
}

/**
 * Converts non-arrays to arrays.  Leaves arrays alone.  Converts
 * undefined values to empty arrays ([] instead of [undefined]).
 * Otherwise, just returns [item] for non-array items.
 *
 * @param {*} item
 * @returns {array} boom! much array. very indexed. so useful.
 */
function toArray(item) {
  if (Array.isArray(item)) {
    return item;
  }
  if (typeof item === 'undefined' || item === null) {
    return [];
  }
  return [item];
}

/**
 * Check whether geojson linestring's 4th coordinate is 1) not timestamp 2) unix time stamp 3) real date time
 * @param timestamps array to be tested if its elements are timestamp
 * @returns the type of timestamp: unix/datetime/invalid(not timestamp)
 */
function containValidTime(timestamps) {
  var formattedTimeStamps = timestamps.map(function (ts) {
    return {
      ts: ts
    };
  });
  var ignoredDataTypes = Object.keys(_typeAnalyzer.DATA_TYPES).filter(function (type) {
    return ![_typeAnalyzer.DATA_TYPES.TIME, _typeAnalyzer.DATA_TYPES.DATETIME, _typeAnalyzer.DATA_TYPES.DATE].includes(type);
  });

  // ignore all types but TIME to improve performance
  var analyzedType = _typeAnalyzer.Analyzer.computeColMeta(formattedTimeStamps, [], {
    ignoredDataTypes: ignoredDataTypes
  })[0];
  if (!analyzedType || analyzedType.category !== 'TIME') {
    return null;
  }
  return analyzedType;
}
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