@geoapify/un-locode/dist/unlocode.js

A Node.js library for querying United Nations Location Code (UN/LOCODE) data

import * as path from 'path';
import csvToJson from 'convert-csv-to-json';
const loadedFiles = new Map();
const fileExpiryTime = 1000 * 60 * 60 * 24; // 24 hours
export function query(countryCode, locationCode) {
    clearOldFiles();
    let file = loadDataFile(countryCode);
    if (!file) {
        return null;
    }
    let item = findItemInFile(file, locationCode);
    if (item) {
        const codeData = {
            country: item.country,
            location: item.location,
            locationName: item.nameWoDiacritics,
            subdivision: item.subdivision,
            status: item.status,
            functionCodes: convertToFunctionArray(item.function)
        };
        if (item.lat && item.lon) {
            codeData.coordinates = {
                lat: parseFloat(item.lat),
                lon: parseFloat(item.lon)
            };
        }
        if (!codeData.subdivision) {
            delete codeData.subdivision;
        }
        return codeData;
    }
    else {
        return null;
    }
}
function loadDataFile(countryName) {
    if (loadedFiles.has(countryName)) {
        return loadedFiles.get(countryName).data;
    }
    const fileName = countryName + '.csv';
    const filePath = path.join(__dirname, 'data', fileName);
    try {
        //const fileContents = await fs.readFile(filePath, 'utf-8');
        const data = csvToJson.fieldDelimiter(',').supportQuotedField(true).getJsonFromCsv(filePath);
        data.forEach(item => {
            if (item['geocoded'] === 'true') {
                item['geocoded'] = true;
            }
            else {
                delete item['geocoded'];
            }
        });
        addFile(countryName, data);
        return data;
    }
    catch (error) {
        return null;
    }
}
function findItemInFile(file, locationCode) {
    return file.find(item => item.location === locationCode);
}
function clearOldFiles() {
    loadedFiles.forEach((value, key) => {
        if (value.loadDate.getTime() + fileExpiryTime < Date.now()) {
            loadedFiles.delete(key);
        }
    });
}
function addFile(countryName, data) {
    loadedFiles.set(countryName, {
        loadDate: new Date(),
        data: data
    });
}
function convertToFunctionArray(functionCode) {
    if (!functionCode) {
        return [];
    }
    let result = [];
    for (let i = 0; i < functionCode.length; i++) {
        if (functionCode.charAt(i) !== '-') {
            result.push(functionCode.charAt(i));
        }
    }
    return result;
}