process twitter text, find mentioned users, hashtags and links

twitterWordsProcessor.js

//twitterWordsProcessor.js
/*
  referente javascript regex
  http://james.padolsey.com/javascript/regular-expressions-in-javascript-part-2/

  Callback Functions in JavaScript
  http://www.impressivewebs.com/callback-functions-javascript/


  ** twitter text processor **

  white spaces 
  [ \t\r\n] = \s

  end with punctuation
  /(:|\.|,|!|\?)$/

  @ {user}
  /^@([a-z0-9-]+((\.|_[a-z0-9-]+)+)?)/i

  # {hashtag}
  /^#([a-z0-9-]+((\.|_[a-z0-9-]+)+)?)/i
  
  (http|https) {link}

  valid URL
  /(http|https):\/\/([a-z0-9-]+((\.[a-z0-9-]+)+)?)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?/

  valid URL shorted
  /(http|https):\/\/([a-z0-9-]+((\.[a-z0-9-]+)+)?)(:[0-9]+)?(\/([a-zA-Z0-9]{1,4}))?(\/([a-zA-Z0-9]{5,32}))$/

*/
//--------------------------------------------------------

var TwtTextProcessor = (function() {

  var patterns = {
    end_with: /(:|\.|,|!|\?)$/,
    user: /^@([a-z0-9-]+((\.|_[a-z0-9-]+)+)?)/i,
    hashtag: /^#([a-z0-9-]+((\.|_[a-z0-9-]+)+)?)/i,
    url: /(http|https):\/\/([a-z0-9-]+((\.[a-z0-9-]+)+)?)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?/
  };

  var resultObj;

  function initResultObj() {
    resultObj = {
      text: null,
      length: 0,
      words: 0,
      mentions: [],
      hashtags: [],
      links: []
    };
  };

  var TwtTextProcessor = function() {};

  TwtTextProcessor.prototype.process = function(text, callback) {
    initResultObj();
    processText(text);
    
    if(callback && typeof(callback) === 'function') {
      callback(resultObj);
    } else {
      console.log(resultObj);
    }
  };

  function processText(text) {
    resultObj.text = text;
    resultObj.length = text.length;

    text = text.replace(/\r\n/g, ' ');
    arr = text.split(' ');
    resultObj.words = arr.length;

    var i = resultObj.words;
    while(i--) {
      processWord(arr[i]);
    }
  }

  function processWord(word) {
    // check end with punctuation
    if(patterns.end_with.test(word)) {
      word = word.replace(patterns.end_with, '');
    }

    // user
    if(patterns.user.test(word)) {
      word = word.replace(/^@/, '');
      resultObj.mentions.push(word);
    }
    // hashtag
    else if(patterns.hashtag.test(word)) {
      word = word.replace(/^#/, '');
      resultObj.hashtags.push(word);
    }
    // url
    else if(patterns.url.test(word)) {
      resultObj.links.push(word);
    }
  }

  return TwtTextProcessor;
})();

//--------------------------------------------------------

function returned(obj) {
  console.log(obj);
  console.log('');
}

var processor = new TwtTextProcessor();

function checkText(text) {
  processor.process(text, returned);  
}

//--------------------------------------------------------

var textArr = [
  'RT @devsexperts: Últimas vagas para o curso de #Java da @SuperaTI! Não perca esta oportunidade! http://j.mp/immGNC #soudev',
  '#soudev Google anuncia o Google+, seu projeto de rede social http://goo.gl/fb/CUjKZ',
  'RT @jaksestren Senti Firmeza!! RT @gusverner Como a gurizada de #ti aqui do Sul afia uma faca http://t.co/fNpkPs1 #FISL #soudev',
  '#soudev Um guia de recursos da plataforma Windows Azure http://goo.gl/fb/yDOKY',
  'RT @soudW: Conhecendo o #Hadoop - post do @ctaurion no #developerWorks http://ibm.co/lTvlrQ #SouDev',
  'RT @Pv_Fusion: Enviar e-mails com zend framework de forma simples http://t.co/vY1SFD3  #soudev #zend #zendframework #php'
];

var i = textArr.length;

while(i--) {
  checkText(textArr[i]);  
}

/* result

{ text: 'RT @Pv_Fusion: Enviar e-mails com zend framework de forma simples http://t.co/vY1SFD3  #soudev #zend #zendframework #php',
  length: 120,
  words: 16,
  mentions: [ 'Pv_Fusion' ],
  hashtags: [ 'php', 'zendframework', 'zend', 'soudev' ],
  links: [ 'http://t.co/vY1SFD3' ] }

{ text: 'RT @soudW: Conhecendo o #Hadoop - post do @ctaurion no #developerWorks http://ibm.co/lTvlrQ #SouDev',
  length: 99,
  words: 13,
  mentions: [ 'ctaurion', 'soudW' ],
  hashtags: [ 'SouDev', 'developerWorks', 'Hadoop' ],
  links: [ 'http://ibm.co/lTvlrQ' ] }

{ text: '#soudev Um guia de recursos da plataforma Windows Azure http://goo.gl/fb/yDOKY',
  length: 78,
  words: 10,
  mentions: [],
  hashtags: [ 'soudev' ],
  links: [ 'http://goo.gl/fb/yDOKY' ] }

{ text: 'RT @jaksestren Senti Firmeza!! RT @gusverner Como a gurizada de #ti aqui do Sul afia uma faca http://t.co/fNpkPs1 #FISL #soudev',
  length: 127,
  words: 20,
  mentions: [ 'gusverner', 'jaksestren' ],
  hashtags: [ 'soudev', 'FISL', 'ti' ],
  links: [ 'http://t.co/fNpkPs1' ] }

{ text: '#soudev Google anuncia o Google+, seu projeto de rede social http://goo.gl/fb/CUjKZ',
  length: 83,
  words: 11,
  mentions: [],
  hashtags: [ 'soudev' ],
  links: [ 'http://goo.gl/fb/CUjKZ' ] }

{ text: 'RT @devsexperts: Últimas vagas para o curso de #Java da @SuperaTI! Não perca esta oportunidade! http://j.mp/immGNC #soudev',
  length: 122,
  words: 17,
  mentions: [ 'SuperaTI', 'devsexperts' ],
  hashtags: [ 'soudev', 'Java' ],
  links: [ 'http://j.mp/immGNC' ] }

*/