ccc_utils/index.js

A Library with useful Methods for the Coding Contest

const fs = require("fs");
const readline = require("readline");

'use strict';

/**
 * Read in File Synchronously
 * @param {string} file
 * @return {array}
 */
module.exports.readFileSync = function (file) {
    return fs.readFileSync(file);
}

/**
 * Read in Lines from File Asynchronously and return a Array with the Lines as String
 * @param {string} file
 * @param {function} callback
 * @return {array}
 */
module.exports.readFileLines = function (file, callback) {

    let lines = [];

    const rl = readline.createInterface({
        input: fs.createReadStream(file)
    })

    rl.on("line", function (line) {
        lines.push(line);
    });

    rl.on("close", function (line) {
        callback(lines);
    })
}

/**
 * Read in Lines from File Asynchronously and return a Array with the Lines as Numbers
 * @param {string} file
 * @param {function} callback
 * @return {array}
 */
module.exports.readFileLinesAsNumber = function (file, cb) {

    let lines = [];

    const rl = readline.createInterface({
        input: fs.createReadStream(file)
    })

    rl.on("line", function (line) {
        lines.push(+line);
    });

    rl.on("close", function (line) {
        cb(lines);
    })
}

/**
 * Read in Numbers seperated by whitespaces from File Asynchronously and return a Array with the Lines as Numbers
 * @param {string} file
 * @param {function} callback
 * @return {array}
 */
module.exports.readFileNumbersWhitespaced = function (file, lineC, callback) {

    let numbers = [];
    let lineCount = 0;

    const rl = readline.createInterface({
        input: fs.createReadStream(file)
    })

    rl.on("line", function (line) {
        if(lineCount == lineC){
            numbers = line.split(" ");
            for(i = 0; i < numbers.length; i++){
                numbers[i] = +numbers[i];
            }
        }
        lineCount++;
    });

    rl.on("close", function (line) {
        callback(numbers);
    })
}

/**
 * Read in String from Console and return the Input
 * @return {string}
 */
module.exports.readInFromConsole = function () {
    const stdin = process.openStdin();


    stdin.addListener("data", function (d) {
        return d.toString().trim();
    });
}

/**
 * Read a Number from Console and return the Input
 * @return {number}
 */
module.exports.readInNumberFromConsole = function () {
    const stdin = process.openStdin();


    stdin.addListener("data", function (d) {
        return +d.toString().trim();
    });
}

/**
 * Read in Numbers from Console and return the Input as Array
 * @return {array}
 */
module.exports.readInNumbersFromConsole = function (callback) {
    const stdin = process.openStdin();
    let numbers = [];

    stdin.addListener("data", function (d) {
        let input = d.toString().trim();
        if (!isNaN(input)) {
            numbers.push(+input);
        }else{
            callback(numbers);
            process.exit(0);
        }
    });
}