@naturalcycles/nodejs-lib/dist/csv/csvReader.js

Standard library for Node.js

// Inspired by: https://gist.github.com/Jezternz/c8e9fafc2c114e079829974e3764db75
import { _assert } from '@naturalcycles/js-lib/error/assert.js';
// export class CSVReader {
//   constructor (cfg: CSVReaderConfig) {
//     this.cfg = {
//       delimiter: ',',
//       includeHeader: true,
//       ...cfg,
//     }
//   }
//
//   public cfg: Required<CSVReaderConfig>
// }
export function csvStringParse(str, cfg = {}) {
    const { firstRowIsHeader = true, columns } = cfg;
    const arr = csvStringToArray(str);
    let header = columns;
    if (firstRowIsHeader) {
        const firstRow = arr.shift();
        header ||= firstRow;
    }
    _assert(header, `firstRowIsHeader or columns is required`);
    return arr.map(row => {
        // oxlint-disable-next-line unicorn/no-array-reduce
        return header.reduce((obj, col, i) => {
            ;
            obj[col] = row[i];
            return obj;
        }, {});
    });
}
export function csvStringToArray(str) {
    const objPattern = /(,|\r?\n|\r|^)(?:"([^"]*(?:""[^"]*)*)"|([^,\r\n]*))/gi;
    let matches;
    const arr = [[]];
    while ((matches = objPattern.exec(str))) {
        if (matches[1].length && matches[1] !== ',') {
            arr.push([]);
        }
        arr[arr.length - 1].push(matches[2] ? matches[2].replaceAll('""', '"') : matches[3]);
    }
    return arr;
}