chs-console-emulation/chs-console-emulation.js

Emulate CodeHS console I/O functions for use in NodeJS environment.

//=========================================================
// chs-console-emulation.js
//
//  ▄         ▄  ▄         ▄  ▄▄▄▄▄▄▄▄▄▄▄ 
// ▐░▌       ▐░▌▐░▌       ▐░▌▐░░░░░░░░░░░▌
// ▐░▌       ▐░▌▐░▌       ▐░▌▐░█▀▀▀▀▀▀▀▀▀ 
// ▐░▌       ▐░▌▐░▌       ▐░▌▐░▌          
// ▐░▌       ▐░▌▐░█▄▄▄▄▄▄▄█░▌▐░█▄▄▄▄▄▄▄▄▄ 
// ▐░▌       ▐░▌▐░░░░░░░░░░░▌▐░░░░░░░░░░░▌
// ▐░▌       ▐░▌▐░█▀▀▀▀▀▀▀█░▌ ▀▀▀▀▀▀▀▀▀█░▌
// ▐░▌       ▐░▌▐░▌       ▐░▌          ▐░▌
// ▐░█▄▄▄▄▄▄▄█░▌▐░▌       ▐░▌ ▄▄▄▄▄▄▄▄▄█░▌
// ▐░░░░░░░░░░░▌▐░▌       ▐░▌▐░░░░░░░░░░░▌
//  ▀▀▀▀▀▀▀▀▀▀▀  ▀         ▀  ▀▀▀▀▀▀▀▀▀▀▀ 
//
// ASCII Art Generated at: http://patorjk.com/software/taag/
// 
// Description: Emulates console functions available in 
//  CodeHS but for use with a NodeJS terminal environment.
//
// Author: Mr. Piltin
//
// Version: 0.1.2
// History: 
//  0.1.0: Initial version
//  0.1.1: Remove exports to test global repl.it compatability
//  0.1.2: Restore module.exports to original configuration
//=========================================================

//=========================================================
// Includes
//=========================================================

var read = require("readline-sync");  // Used to process input from terminal

//=========================================================
// Functions
//=========================================================

global.readLine = console.readLine = function (prompt) {
  return read.question(prompt);
}

global.readInt = console.readInt = function (prompt) {
  while (true) {
    var str = read.question(prompt);
    var num = parseInt(str);
    if (isNaN(num)) {
      println("Invalid response, please enter an integer value.");
    } else {
      return num;
    }
  }
}

global.readFloat = console.readFloat = function (prompt) {
  while (true) {
    var str = read.question(prompt);
    var num = parseFloat(str);
    if (isNaN(num)) {
      println("Invalid response, please enter a decimal value.");
    } else {
      return num;
    }
  }
}

global.readBoolean = console.readBoolean = function (prompt) {
  while (true) {
    var str = read.question(prompt);
    str = str.toLowerCase();
    if (str == "t" || str == "y" || str == "true" || str == "yes") {
      return true;
    } else if (str == "f" || str == "n" || str == "false" || str == "no") {
      return false;
    }
    println("Invalid response, please enter yes/no or true/false.");
  }
}

global.print = console.print = function (text) {
  process.stdout.write(text);
}

global.println = console.println = function (text) {
  process.stdout.write(text + "\n");
}

global.clearScreen = console.clearScreen = function () {
  console.clear();
}

module.exports = {
  readLine, readInt, readFloat, readBoolean, print, println, clearScreen
}