/* $Id: util.js 1.1 2008/10/04 13:59:07 sassano Exp $ */

function tfidf_remove_hyphen(s)
{
  var n = s.length;
  var t = '';
  for (var i = 0; i < n; i++) {
    var c = s.charAt(i);
    if (c == '-' || c == ' ') {
      // Do nothing.
    } else {
      t += c;
    }
  }
  return t;
}

function tfidf_randomize_index(i)
{
   return (i * 4096 + 150889) % 714025;
}

function tfidf_find_image(i)
{
  if (i.width == "1" && i.src.match(/\.09\./)) {
    i.src = i.src.replace('.09.', '.01.');
  } else if (i.width == "1" && i.src.match(/\.01\./)) {
    i.src = 'images/book01.gif';
  }
}

function tfidf_hashpjw(s)
{
  var h = 0;
  var g = 0;
  for (var i = 0; i < s.length; i++) {
    h = (h << 4) + s.charCodeAt(i);
    if (g = h & 0xf0000000) {
      h = h ^ (g >> 24);
      h = h ^ g;
    }
  }
  return h % 1001;
}

function tfidf_hb(u)
{
  var b = ' <a href="http://b.hatena.ne.jp/entry/' + u;
  b = b + '">';
  b = b + '<img src="http://b.hatena.ne.jp/entry/image/' + u;
  b = b + '" border=0 /></a>';

  return b;
}

function tfidf_hb_amzn(a)
{
  var u = 'http://www.amazon.co.jp/gp/product/' + a;
  return tfidf_hb(u);
}

/* this file ends here. */