mauss/src/csv/index.js

lightweight, modular, type-safe utilities

/**
 * Parse a CSV content into a 2D array.
 *
 * @example
 * ```javascript
 * import { readFileSync } from 'fs';
 * import { read } from 'mauss/csv';
 * const csv = read(readFileSync('./data.csv', 'utf-8'));
 * ```
 *
 * @returns a 2D array of the CSV content
 */
export function read(content) {
    let current = [''];
    let parsing = true;
    let col = 0;
    let memo = '';
    const accumulator = [current];
    for (let char of content) {
        if (char === '"') {
            if (parsing && char === memo)
                current[col] += char;
            parsing = !parsing;
        }
        else if (parsing && char === ',') {
            current[++col] = char = '';
        }
        else if (parsing && char === '\n') {
            if (memo === '\r')
                current[col] = current[col].slice(0, -1);
            accumulator[accumulator.length] = current = [(char = '')];
            col = 0;
        }
        else {
            current[col] += char;
        }
        memo = char;
    }
    return accumulator;
}