135 lines
3.4 KiB
JavaScript
135 lines
3.4 KiB
JavaScript
'use strict';
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Object.defineProperty(exports, '__esModule', { value: true });
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var fs = require('fs');
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var path = require('path');
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function _interopDefaultLegacy (e) { return e && typeof e === 'object' && 'default' in e ? e : { 'default': e }; }
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var fs__default = /*#__PURE__*/_interopDefaultLegacy(fs);
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var path__default = /*#__PURE__*/_interopDefaultLegacy(path);
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/**
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* @copyright 2016 commenthol
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* @license MIT
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* @module vsop87
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*/
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const REGVSOP = /^\sVSOP87.*VARIABLE (\d) \((LBR|XYZ)\).{1,20}\*T\*\*(\d)\s{1,20}(\d{1,20}) TERMS/;
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// planet names in VSOP87 files
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const planets = [
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'mercury',
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'venus',
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'earth',
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'mars',
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'jupiter',
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'saturn',
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'uranus',
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'neptune'
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];
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// VSOP planet extension names
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const exts = ['mer', 'ven', 'ear', 'mar', 'jup', 'sat', 'ura', 'nep'];
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const toFloat = function (f) {
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return parseFloat(f, 10)
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};
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class VSOP {
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/**
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* load VSOP87 planet data from VSOP87 files
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* Data can be obtained from ftp://cdsarc.u-strasbg.fr/pub/cats/VI%2F81/
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* @throws {Error}
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* @param {String} planet - MERCURY VENUS EARTH MARS JUPITER SATURN URANUS NEPTUNE
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* @param {String} dirname - folder containing VSOP87 files
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* @param {Object} [opts]
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* @param {String} [opts.type] - file type A, B, C, D - See vsop87.txt
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*/
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constructor (planet, dirname, opts) {
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planet = planet.toLowerCase();
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if (~planets.indexOf(planet)) {
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opts = opts || {};
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this.planet = planet;
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this.dirname = dirname;
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this.type = opts.type || 'B'; // HELIOCENTRIC DYNAMICAL ECLIPTIC AND EQUINOX J2000
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} else {
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throw (new Error('Invalid planet ' + planet))
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}
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}
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/** get file extension for planet */
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_getExt () {
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return exts[planets.indexOf(this.planet)]
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}
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/** load data from file */
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load (cb) {
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const ext = this._getExt();
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const filename = path__default["default"].resolve(this.dirname, 'VSOP87' + this.type + '.' + ext);
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fs__default["default"].readFile(filename, 'utf8', (err, data) => {
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if (!err) {
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this.parse(data);
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}
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cb(err);
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});
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}
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/** sync loading */
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loadSync () {
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const ext = this._getExt();
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const filename = path__default["default"].resolve(this.dirname, 'VSOP87' + this.type + '.' + ext);
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const data = fs__default["default"].readFileSync(filename, 'utf8');
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this.parse(data);
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}
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/**
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* parse data
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* @param {String} data - content of VSOP file
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*/
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parse (data) {
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this.data = {};
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const lines = data.split(/\n/);
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let varName;
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let ref;
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lines.forEach((line) => {
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if (REGVSOP.test(line)) {
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const [, varCnt, type, pos] = line.match(REGVSOP);
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varName = type.split('')[varCnt - 1];
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if (!this.data[varName]) this.data[varName] = {};
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ref = this.data[varName][pos] = [];
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} else {
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if (line.length > 79) {
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ref.push([
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toFloat(line.substr(79, 97).trim()),
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toFloat(line.substr(98, 111).trim()),
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toFloat(line.substr(111, 131).trim())
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]);
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}
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}
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});
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}
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/**
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* get parsed data
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* @return {Object}
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* ```js
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* { L: { '0': [[<A>, <B>, <C>], ...], '1': [], '2': [], '3': [], '4': [], '5': [] },
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* B: { '0': [], '1': [], '2': [], '3': [], '4': [], '5': [] },
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* R: { '0': [], '1': [], '2': [], '3': [], '4': [], '5': [] } }
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* ```
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*/
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getData () {
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return this.data
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}
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}
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var vsop87 = {
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VSOP
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};
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exports.VSOP = VSOP;
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exports["default"] = vsop87;
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