aprs-parser/lib/StatusReport/StatusReportParser.js

JavaScript library for parsing APRS packets

'use strict';

const AbstractParser = require('../AbstractParser.js');
const Models = require('../MessageModels');
const PositionParserUtils = require('../Position/PositionParserUtils');

function StatusReportParser() {

}

StatusReportParser.constructor = StatusReportParser;
StatusReportParser.prototype = Object.create(AbstractParser.prototype);

StatusReportParser.prototype.isMatching = function (bodyContent) {
    return bodyContent[0] == '>';
};

StatusReportParser.prototype.tryParse = function (bodyContent, aprsMessageHeader) {
    const report = new Models.StatusReport();

    const maidenheadLocator = bodyContent.match('^>([A-Z]{2}[0-9]{2}[A-Z]{0,2})([/|\\\\].) (.+)'); //regex capturing locator, then symbol and status text
    if(maidenheadLocator) { //status report with locator
        const locator = maidenheadLocator[1];
        const symbol = maidenheadLocator[2];
        bodyContent = maidenheadLocator[3]; //only status

        report.setLocator(locator);
        report.setSymbol(symbol);
    } else { //no locator so might contain timestamp
        try {
            const timestamp = PositionParserUtils.parseTimestamp(bodyContent.substr(1,7));
            if(timestamp) {
                report.setTimestamp(timestamp);
                bodyContent = bodyContent.substr(8); //remove > with timestamp
            }
        }
        catch(ex) {
            //not a timestamp, remove only >
            bodyContent = bodyContent.substr(1);
        }
    }

    //check if ERP and heading set
    if(bodyContent.match('\\^(..)$')) {
        report.setBeamHeading(bodyContent[bodyContent.length - 2]);
        report.setERP(bodyContent[bodyContent.length - 1]); //last character

        bodyContent = bodyContent.substr(0, bodyContent.length - 3); //remove erp and heading information from status
    }

    report.setStatusText(bodyContent);

    return report;
};

StatusReportParser.prototype.getParserName = function () {
    return 'StatusReportParser';
};

module.exports = StatusReportParser;