var DEBUG = false;

function str_tab()
{
  this.response = null;

  this.tab_to_str = function(TAB)
  { return this._tab_to_str("", TAB);
  }

  this._tab_to_str = function(pre, TAB)
  { var content = "";
    var HAS_VALUES = false;
    for(var key in TAB)
    { HAS_VALUES = true;
      if(typeof(TAB[key]) == "object") content += this._tab_to_str(pre + key.length + ":"  + key, TAB[key]);
      else content += pre + key.length + ":" + key + ("" + TAB[key]).length + ":" + TAB[key] + "\n";
    }
    if(HAS_VALUES) return content;
    return pre + "a:\n";
  }

  this.str_to_tab = function(content)
  { var TAB = {};
    var n = 0;
    while(n < content.length)
    { var LINE_FOUND = false;
      var words = new Array();
      while(n < content.length && !LINE_FOUND)
      { var length = "";
        var word = "";
        var ENDS_WITH_EMPTY_TAB = false;
        while(n < content.length && content.charAt(n) != ':') { length += content.charAt(n); n++; } n++;
        if(length == "a") ENDS_WITH_EMPTY_TAB = true;
        else
        { for(var k = 0; k < parseInt(length); k++) { word += content.charAt(n); n++; }
          words.push(word);
        }
        LINE_FOUND = ENDS_WITH_EMPTY_TAB || n == content.length || content.charAt(n) == '\n';
      }
      n++;
      if(words.length > 0) TAB = this.affect(TAB, words, ENDS_WITH_EMPTY_TAB);
    }
    return TAB;
  }

  this.affect = function(TAB, words, ENDS_WITH_EMPTY_TAB)
  { if(words.length > (ENDS_WITH_EMPTY_TAB ? 1 : 2))
      { if(typeof(TAB[words[0]]) != "object") TAB[words[0]] = {};
      var _words = new Array();
      var FIRST = true;
      for(var k = 0; k < words.length; k++)
      { if(FIRST) FIRST = false;
        else _words.push(words[k]);
      }
      TAB[words[0]] = this.affect(TAB[words[0]], _words, ENDS_WITH_EMPTY_TAB);
    }
    else TAB[words[0]] = (ENDS_WITH_EMPTY_TAB ? {} : words[1]);
    return TAB;
  }

  this.str_to_hex = function(str)
  { var hex = "";
    for(var n = 0; n < str.length; n++)
    { var hex_char = str.charCodeAt(n).toString(16);
      if(hex_char.length == 1) hex_char = "0" + hex_char;
      hex += hex_char;
    }
    return hex;
  }

  this.hex_to_str = function(hex)
  { var n = 0;
    var str = "";
    while(n + 2 <= hex.length) { str += unescape("%" + hex.substr(n, 2)); n += 2; }
    return str;
  }

  this.request = function(file, req_tab, callback, str_tab_inst)
  { if(window.XMLHttpRequest && !(window.ActiveXObject))
    { try { req = new XMLHttpRequest(); }
      catch(e) { req = false; }
    }
    else if(window.ActiveXObject)
    { try { req = new ActiveXObject("Msxml2.XMLHTTP"); }
      catch(e)
      { try { req = new ActiveXObject("Microsoft.XMLHTTP");    }
        catch(e) { req = false; }
      }
    }
    if(req)
    { req.open("POST", file, true);
      req.onreadystatechange = function()
      { if(req.readyState == 4)
        { if(DEBUG) alert(str_tab_inst.hex_to_str(req.responseText));
		  str_tab_inst.response = str_tab_inst.str_to_tab(str_tab_inst.hex_to_str(req.responseText));
          if(typeof(str_tab_inst.response["erreur"]) != "undefined") alert(str_tab_inst.response["erreur"]);
          eval(callback);
        }
      }
      req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
      req.send("post_request=" + this.str_to_hex(this.tab_to_str(req_tab)));
    }
  }

}

var str_tab = new str_tab();