JavaScript Programming assignment

import parse from './expr-parser.mjs'; import AppError from './app-error.mjs'; import Spreadsheet from './spreadsheet.mjs'; import readline from 'readline'; /************************* Top level routine ***************************/ export default async function go() { const spreadsheet = await Spreadsheet.make(); await repl(spreadsheet); } const PROMPT = '>> '; async function repl(spreadsheet) { const rl = readline.createInterface({ input: process.stdin, output: process.stdout, terminal: false, //no ANSI terminal escapes prompt: PROMPT, }); rl.on('line', async (line) => await doLine(spreadsheet, line, rl)); rl.prompt(); } async function doLine(spreadsheet, line, rl) { try { line = line.trim(); if (line.length > 0) { const splits = line.split('='); if (splits.length !== 2) { console.error('input must be of type "cellId = expr"'); } else if (splits[0].indexOf('$') >= 0) { console.error('cellId being assigned to cannot contain absolute refs'); } else { const [baseCellId, expr] = [splits[0].trim(), splits[1]]; const verifyBaseCellId = parse(baseCellId); const results = await spreadsheet.eval(baseCellId.trim(), expr); const sortedResultPairs = Object.keys(results).sort().map(k => [k, results[k]]); console.log(Object.fromEntries(sortedResultPairs)); } } } catch (err) { if (err instanceof AppError) { console.error(err.toString()); } else { throw err; } } rl.prompt(); }