Subsecciones

Práctica: Palabras Repetidas

Se trata de producir una salida en las que las palabras repetidas consecutivas sean reducidas a una sola aparición. Rellena las partes que faltan.

Ejemplo de ejecución

**Figura:** Ejemplo de pantalla de La aplicación para el Análisis de Datos en Formato CSV

Estructura

[~/Dropbox/src/javascript/PLgrado/repeatedwords(master)]$  tree --charset utf-8 
.
├── README
├── global.css
├── index.html
├── input.txt
├── input2.txt
├── inputhtml1.txt
└── repeated_words.js

0 directories, 7 files

index.html

[~/Dropbox/src/javascript/PLgrado/repeatedwords(master)]$ cat index.html 
<html>
  <head>
     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
     <title>File Input</title>
     <link href="global.css" rel="stylesheet" type="text/css">

     <script type="text/javascript" src="../../underscore/underscore.js"></script>
     <script type="text/javascript" src="../../jquery/starterkit/jquery.js"></script>
     <script type="text/javascript" src="repeated_words.js"></script>
  </head>
  <body>
    <h1>File Input</h1>
    <input type="file" id="fileinput" />
    <div id="out" class="hidden">
    <table>
      <tr><th>Original</th><th>Transformed</th></tr>
      <tr>
        <td>
          <pre class="input" id="initialinput"></pre>
        </td>
        <td>
          <pre class="output" id="finaloutput"></pre>
        </td>
      </tr>
    </table>
    </div>
  </body>
</html>

Tag input

global.css

Rellena los estilos para hidden y unhidden:

[~/Dropbox/src/javascript/PLgrado/repeatedwords(master)]$ cat global.css 
html *
{
   font-size: large; 
   /* The !important ensures that nothing can override what you've set in this style (unless it is also important). */
   font-family: Arial;
}

.thumb {
    height: 75px;
    border: 1px solid #000;
    margin: 10px 5px 0 0;
  }

h1            { text-align: center; font-size: x-large; }
th, td        { vertical-align: top; text-align: right; }   
/* #finaltable  * { color: white; background-color: black; }   */

/* #finaltable table { border-collapse:collapse; } */
/* #finaltable table, td { border:1px solid white; } */
#finaltable:hover td { background-color: blue; } 
tr:nth-child(odd)    { background-color:#eee; }
tr:nth-child(even)    { background-color:#00FF66; }
input        { text-align: right;  border: none;       }     /* Align input to the right  */
textarea     { border: outset; border-color: white;       }                        
table        { border: inset; border-color: white; }
.hidden      { display: ____; }
.unhidden    { display: _____; }
table.center { margin-left:auto; margin-right:auto; }
#result      { border-color: red; }
tr.error       { background-color: red; }
pre.output   { background-color: white; }
span.repeated { background-color: red }

body
{
 background-color:#b0c4de;  /* blue */

repeated_words.js

Rellena las expresiones regulares que faltan:

[~/srcPLgrado/repeatedwords(master)]$ cat repeated_words.js 
"use strict"; // Use ECMAScript 5 strict mode in browsers that support it

$(document).ready(function() {
   $("#fileinput").change(calculate);
});

function generateOutput(contents) {
  return contents.replace(/____________________/__,'__________________________________');
}

function calculate(evt) {
  var f = evt.target.files[0]; 
  var contents = '';

  if (f) {
    var r = new FileReader();
    r.onload = function(e) { 
      contents = e.target.result;
      var escaped  = escapeHtml(contents);
      var outdiv = document.getElementById("out");
      outdiv.className = 'unhidden';
      finaloutput.innerHTML = generateOutput(escaped);
      initialinput.innerHTML = escaped;

    }
    r.readAsText(f);
  } else { 
    alert("Failed to load file");
  }
}

var entityMap = {
    "&": "&amp;",
    "<": "&lt;",
    ">": "&gt;",
    '"': '&quot;',
    "'": '&#39;',
    "/": '&#x2F;'
  };

function escapeHtml(string) {
  return String(string).replace(/_________/g, function (s) {
    return ____________;
  });

Ficheros de Entrada

[~/Dropbox/src/javascript/PLgrado/repeatedwords(master)]$ cat input2.txt 
habia una vez 
vez un viejo viejo
hidalgo que vivia 
vivia
[~/Dropbox/src/javascript/PLgrado/repeatedwords(master)]$ cat input.txt 
one one
nothing rep
is two three
three four
[~/Dropbox/src/javascript/PLgrado/repeatedwords(master)]$ cat inputhtml1.txt 
habia => una vez 
vez & un viejo viejo <puchum>
hidalgo  & <pacham> que vivia 
vivia </que se yo>

Casiano Rodríguez León
2013-04-23