using node.js Use NPM to download a free module called “colors”. Modify app.js f

Question

using node.js

Use NPM to download a free module called “colors”. Modify app.js file so that the customer’s feedback text will be shown as green in the black console.

I already installed colors.js but it still not change the text color.

app.js:

/**

app.js

This is a simple web site that hosts

a fake Wake Tech Credit Union web site.

It is used to demonstrate how easy it is to

create and deploy a web sever using Node.js.

*/

var express = require('express');

var colors = require('./node_modules/colors');

var fs = require('fs');

/**

* Define the sample application.

*/

var SampleApp = function() {

// Scope.

var self = this;

/* ================================================================ */

/* Helper functions. */

/* ================================================================ */

/**

* Set up server IP address and port # using env variables/defaults.

*/

self.setupVariables = function() {

// Set the environment variables we need.

//self.ipaddress = process.env.IP;

//self.port = process.env.PORT || 5000;

//if (typeof self.ipaddress === "undefined") {

// self.ipaddress = "127.0.0.1";

//};

};

/**

* Populate the cache.

*/

self.populateCache = function() {

if (typeof self.zcache === "undefined") {

self.zcache = { 'index.html': '' };

}

// Local cache for static content.

self.zcache['index.html'] = fs.readFileSync('./index.html');

};

/**

* Retrieve entry (content) from cache.

* @param {string} key Key identifying content to retrieve from cache.

*/

self.cache_get = function(key) { return self.zcache[key]; };

/**

* terminator === the termination handler

* Terminate server on receipt of the specified signal.

* @param {string} sig Signal to terminate on.

*/

self.terminator = function(sig){

if (typeof sig === "string") {

console.log('%s: Received %s - terminating sample app ...',

Date(Date.now()), sig);

process.exit(1);

}

console.log('%s: Node server stopped.', Date(Date.now()) );

};

/**

* Setup termination handlers (for exit and a list of signals).

*/

self.setupTerminationHandlers = function(){

// Process on exit and signals.

process.on('exit', function() { self.terminator(); });

// Removed 'SIGPIPE' from the list - bugz 852598.

['SIGHUP', 'SIGINT', 'SIGQUIT', 'SIGILL', 'SIGTRAP', 'SIGABRT',

'SIGBUS', 'SIGFPE', 'SIGUSR1', 'SIGSEGV', 'SIGUSR2', 'SIGTERM'

].forEach(function(element, index, array) {

process.on(element, function() { self.terminator(element); });

});

};

/* ================================================================ */

/* App server functions (main app logic here). */

/* ================================================================ */

/**

* Create the routing table entries + handlers for the application.

*/

self.createRoutes = function() {

self.routes = { };

self.routes['/feedback'] = function(req, res) {

console.log("-- Received a customer feedback: [" + req.body.feedback.colors.red + "]");

res.send("

WTCU Feedback

Thanks for your feedback!

");

};

self.routes['/'] = function(req, res) {

res.setHeader('Content-Type', 'text/html');

res.send(self.cache_get('index.html') );

};

};

/**

* Initialize the server (express) and create the routes and register

* the handlers.

*/

self.initializeServer = function() {

self.createRoutes();

//self.app = express.createServer();

self.app = express();

self.app.set('port', process.env.PORT || 3333);

self.app.set('ip', process.env.IP || "127.0.0.1");

self.app.use(express.static(__dirname));

//self.app.use(express.bodyParser());

self.app.use(express.json());

self.app.use(express.urlencoded());

// Add handlers for the app (from the routes).

for (var r in self.routes) {

self.app.get(r, self.routes[r]); // maps the HTTP GET request

self.app.post(r, self.routes[r]); // maps the HTTP POST request

}

};

/**

* Initializes the sample application.

*/

self.initialize = function() {

self.setupVariables();

self.populateCache();

self.setupTerminationHandlers();

// Create the express server and routes.

self.initializeServer();

};

/**

* Start the server (starts up the sample application).

*/

self.start = function() {

// Start the app on the specific interface (and port).

self.app.listen(self.app.get('port'), function() {

console.log('%s: Node server started on %s:%d ...',

Date(Date.now() ), self.app.get('ip'), self.app.get('port'));

});

};

}; /* Sample Application. */

/**

* main(): Main code.

*/

var zapp = new SampleApp();

zapp.initialize();

zapp.start();

nods_modules/colors.js:

var colors = {};
module['exports'] = colors;

colors.themes = {};

var ansiStyles = colors.styles = require('./styles');
var defineProps = Object.defineProperties;

colors.supportsColor = require('./system/supports-colors');

if (typeof colors.enabled === "undefined") {
colors.enabled = colors.supportsColor;
}

colors.stripColors = colors.strip = function(str){
return ("" + str).replace(/+m/g, '');
};

var stylize = colors.stylize = function stylize (str, style) {
if (!colors.enabled) {
return str+'';
}

return ansiStyles[style].open + str + ansiStyles[style].close;
}

var matchOperatorsRe = /[|\{}()[]^$+*?.]/g;
var escapeStringRegexp = function (str) {
if (typeof str !== 'string') {
throw new TypeError('Expected a string');
}
return str.replace(matchOperatorsRe, '\$&');
}

function build(_styles) {
var builder = function builder() {
return applyStyle.apply(builder, arguments);
};
builder._styles = _styles;
// __proto__ is used because we must return a function, but there is
// no way to create a function with a different prototype.
builder.__proto__ = proto;
return builder;
}

var styles = (function () {
var ret = {};
ansiStyles.grey = ansiStyles.gray;
Object.keys(ansiStyles).forEach(function (key) {
ansiStyles[key].closeRe = new RegExp(escapeStringRegexp(ansiStyles[key].close), 'g');
ret[key] = {
get: function () {
return build(this._styles.concat(key));
}
};
});
return ret;
})();

var proto = defineProps(function colors() {}, styles);

function applyStyle() {
var args = arguments;
var argsLen = args.length;
var str = argsLen !== 0 && String(arguments[0]);
if (argsLen > 1) {
for (var a = 1; a < argsLen; a++) {
str += ' ' + args[a];
}
}

if (!colors.enabled || !str) {
return str;
}

var nestedStyles = this._styles;

var i = nestedStyles.length;
while (i--) {
var code = ansiStyles[nestedStyles[i]];
str = code.open + str.replace(code.closeRe, code.open) + code.close;
}

return str;
}

function applyTheme (theme) {
for (var style in theme) {
(function(style){
colors[style] = function(str){
if (typeof theme[style] === 'object'){
var out = str;
for (var i in theme[style]){
out = colors[theme[style][i]](out);
}
return out;
}
return colors[theme[style]](str);
};
})(style)
}
}

colors.setTheme = function (theme) {
if (typeof theme === 'string') {
try {
colors.themes[theme] = require(theme);
applyTheme(colors.themes[theme]);
return colors.themes[theme];
} catch (err) {
console.log(err);
return err;
}
} else {
applyTheme(theme);
}
};

function init() {
var ret = {};
Object.keys(styles).forEach(function (name) {
ret[name] = {
get: function () {
return build([name]);
}
};
});
return ret;
}

var sequencer = function sequencer (map, str) {
var exploded = str.split(""), i = 0;
exploded = exploded.map(map);
return exploded.join("");
};

// custom formatter methods
colors.trap = require('./custom/trap');
colors.zalgo = require('./custom/zalgo');

// maps
colors.maps = {};
colors.maps.america = require('./maps/america');
colors.maps.zebra = require('./maps/zebra');
colors.maps.rainbow = require('./maps/rainbow');
colors.maps.random = require('./maps/random')

for (var map in colors.maps) {
(function(map){
colors[map] = function (str) {
return sequencer(colors.maps[map], str);
}
})(map)
}

defineProps(colors, init());

Explanation / Answer

THE CODE HAS MODIFIED

create and deploy a web sever using Node.js.
*/
var express = require('express');
var colors = require('./node_modules/colors');
var fs = require('fs');
/**
* Define the sample application.
*/
var SampleApp = function() {
// Scope.
var self = this;
/* ================================================================ */
/* Helper functions. */
/* ================================================================ */
/**
* Set up server IP address and port # using env variables/defaults.
*/
self.setupVariables = function() {
// Set the environment variables we need.
//self.ipaddress = process.env.IP;
//self.port = process.env.PORT || 5000;
//if (typeof self.ipaddress === "undefined") {
// self.ipaddress = "127.0.0.1";
//};
};
/**
* Populate the cache.
*/
self.populateCache = function() {
if (typeof self.zcache === "undefined") {
self.zcache = { 'index.html': '' };
}
// Local cache for static content.
self.zcache['index.html'] = fs.readFileSync('./index.html');
};
/**
* Retrieve entry (content) from cache.
* @param {string} key Key identifying content to retrieve from cache.
*/
self.cache_get = function(key) { return self.zcache[key]; };
/**
* terminator === the termination handler
* Terminate server on receipt of the specified signal.
* @param {string} sig Signal to terminate on.
*/
self.terminator = function(sig){
if (typeof sig === "string") {
console.log('%s: Received %s - terminating sample app ...',
Date(Date.now()), sig);
process.exit(1);
}
console.log('%s: Node server stopped.', Date(Date.now()) );
};
/**
* Setup termination handlers (for exit and a list of signals).
*/
self.setupTerminationHandlers = function(){
// Process on exit and signals.
process.on('exit', function() { self.terminator(); });
// Removed 'SIGPIPE' from the list - bugz 852598.
['SIGHUP', 'SIGINT', 'SIGQUIT', 'SIGILL', 'SIGTRAP', 'SIGABRT',
'SIGBUS', 'SIGFPE', 'SIGUSR1', 'SIGSEGV', 'SIGUSR2', 'SIGTERM'
].forEach(function(element, index, array) {
process.on(element, function() { self.terminator(element); });
});
};
/* ================================================================ */
/* App server functions (main app logic here). */
/* ================================================================ */
/**
* Create the routing table entries + handlers for the application.
*/
self.createRoutes = function() {
self.routes = { };
self.routes['/feedback'] = function(req, res) {
console.log("-- Received a customer feedback: [" + req.body.feedback.colors.red + "]");
res.send("
WTCU Feedback
Thanks for your feedback!
");
};
self.routes['/'] = function(req, res) {
res.setHeader('Content-Type', 'text/html');
res.send(self.cache_get('index.html') );
};
};
/**
* Initialize the server (express) and create the routes and register
* the handlers.
*/
self.initializeServer = function() {
self.createRoutes();
//self.app = express.createServer();
self.app = express();
self.app.set('port', process.env.PORT || 3333);
self.app.set('ip', process.env.IP || "127.0.0.1");
self.app.use(express.static(__dirname));
//self.app.use(express.bodyParser());
self.app.use(express.json());
self.app.use(express.urlencoded());
// Add handlers for the app (from the routes).
for (var r in self.routes) {
self.app.get(r, self.routes[r]); // maps the HTTP GET request
self.app.post(r, self.routes[r]); // maps the HTTP POST request
}
};
/**
* Initializes the sample application.
*/
self.initialize = function() {
self.setupVariables();
self.populateCache();
self.setupTerminationHandlers();
// Create the express server and routes.
self.initializeServer();
};
/**
* Start the server (starts up the sample application).
*/
self.start = function() {
// Start the app on the specific interface (and port).
self.app.listen(self.app.get('port'), function() {
console.log('%s: Node server started on %s:%d ...',
Date(Date.now() ), self.app.get('ip'), self.app.get('port'));
});
};
}; /* Sample Application. */
/**
* main(): Main code.
*/
var zapp = new SampleApp();
zapp.initialize();
zapp.start();



nods_modules/colors.js:
var colors = {};
module['exports'] = colors;
colors.themes = {};
var ansiStyles = colors.styles = require('./styles');
var defineProps = Object.defineProperties;
colors.supportsColor = require('./system/supports-colors');
if (typeof colors.enabled === "undefined") {
colors.enabled = colors.supportsColor;
}
colors.stripColors = colors.strip = function(str){
return ("" + str).replace(/+m/g, '');
};

var stylize = colors.stylize = function stylize (str, style) {
if (!colors.enabled) {
return str+'';
}
return ansiStyles[style].open + str + ansiStyles[style].close;
}
var matchOperatorsRe = /[|\{}()[]^$+*?.]/g;
var escapeStringRegexp = function (str) {
if (typeof str !== 'string') {
throw new TypeError('Expected a string');
}
return str.replace(matchOperatorsRe, '\$&');
}
function build(_styles) {
var builder = function builder() {
return applyStyle.apply(builder, arguments);
};
builder._styles = _styles;
// __proto__ is used because we must return a function, but there is
// no way to create a function with a different prototype.
builder.__proto__ = proto;
return builder;
}
var styles = (function () {
var ret = {};
ansiStyles.grey = ansiStyles.gray;
Object.keys(ansiStyles).forEach(function (key) {
ansiStyles[key].closeRe = new RegExp(escapeStringRegexp(ansiStyles[key].close), 'g');
ret[key] = {
get: function () {
return build(this._styles.concat(key));
}
};
});
return ret;
})();
var proto = defineProps(function colors() {}, styles);
function applyStyle() {
var args = arguments;
var argsLen = args.length;
var str = argsLen !== 0 && String(arguments[0]);
if (argsLen > 1) {
for (var a = 1; a < argsLen; a++) {
str += ' ' + args[a];
}
}
if (!colors.enabled || !str) {
return str;
}
var nestedStyles = this._styles;
var i = nestedStyles.length;
while (i--) {
var code = ansiStyles[nestedStyles[i]];
str = code.open + str.replace(code.closeRe, code.open) + code.close;
}
return str;
}
function applyTheme (theme) {
for (var style in theme) {
(function(style){
colors[style] = function(str){
if (typeof theme[style] === 'object'){
var out = str;
for (var i in theme[style]){
out = colors[theme[style][i]](out);
}
return out;
}
return colors[theme[style]](str);
};
})(style)
}
}
colors.setTheme = function (theme) {
if (typeof theme === 'string') {
try {
colors.themes[theme] = require(theme);
applyTheme(colors.themes[theme]);
return colors.themes[theme];
} catch (err) {
console.log(err);
return err;
}
} else {
applyTheme(theme);
}
};
function init() {
var ret = {};
Object.keys(styles).forEach(function (name) {
ret[name] = {
get: function () {
return build([name]);
}
};
});
return ret;
}
var sequencer = function sequencer (map, str) {
var exploded = str.split(""), i = 0;
exploded = exploded.map(map);
return exploded.join("");
};
// custom formatter methods
colors.trap = require('./custom/trap');
colors.zalgo = require('./custom/zalgo');
// maps
colors.maps = {};
colors.maps.america = require('./maps/america');
colors.maps.zebra = require('./maps/zebra');
colors.maps.rainbow = require('./maps/rainbow');
colors.maps.random = require('./maps/random')
for (var map in colors.maps) {
(function(map){
colors[map] = function (str) {
return sequencer(colors.maps[map], str);
}
})(map)
}
defineProps(colors, init());

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