prueba.js

const readline = require("readline");
fs = require("fs");
FILE_NAME = "ledger-sample-files/Income.ledger";

let lector = readline.createInterface({
    input: fs.createReadStream(FILE_NAME)
});

const RGX_DATE = /\d{4}\/\d{1,2}\/\d{1,2}/;
const RGX_DESCRIPTION = /[^\d{4}\/\d{1,2}\/\d{1,2}]+/;
const RGX_ACCOUNT_NAME = /[^\-?\$?\d+\.?\d+$]+/;
const RGX_MOVEMENT = /\-?\$?\d+\.?\d?.+/;
const RGX_AMOUNT = /[\-.|\d]/;
const RGX_AMOUNTTEST = /(\s\-?\$\-*\d+.*)|(\s\-*\d+ \w{2,3})/g;

var contador = 0;
var negcurrency;

var movement = {};
var transaccion = {}
var array_transactions = []

function lectura () {



lector.on("line", line => {

    if  (line.startsWith(";")) {
        return;
    }


    //FECHA
    if (line.match(RGX_DATE)){
        if (JSON.stringify(transaccion)!='{}') {
            array_transactions.push(transaccion);
        } 
        transaccion = { movements: []}
        
        var date= (line.match(RGX_DATE).toString());
        transaccion['date'] = date;
    
        //Decripcion de transaccion
        var description = (line.match(RGX_DESCRIPTION).toString().trim());
        transaccion['description'] = description; 

        

        return;
        
    } else if (line.match(RGX_ACCOUNT_NAME)) {
        movement['description'] = line.match(RGX_ACCOUNT_NAME).toString().trim();
        if (line.match(RGX_AMOUNTTEST)) {
            var cantidad = line.match(RGX_AMOUNTTEST).toString().trim();
            if (cantidad.startsWith('$')|| cantidad.startsWith('-$')) {
                cantidad = cantidad.replace('$','');
                var monto = parseFloat(cantidad);
                var currency = 'USD';
            } else {
                cantidad = cantidad.split(' ');
                var monto = parseFloat(cantidad[0]);
                var currency = cantidad[1];
            }
            contador += monto;
            negcurrency = currency;
            
            movement['amount'] = monto;
            movement['currency'] = currency;
            account = {}
        } else {
            movement['amount'] = -contador;
            movement['currency'] = negcurrency;
            account = {}
            contador = 0;
        }
        transaccion['movements'].push(movement);
        movement = {}
    }    
    
});

}
lectura()