matitaB/matita/matitaweb.js

   1 var locked;
   2 var unlocked;
   3 var workarea;
   4 var scriptcell;
   5 var goalcell;
   6 var goals;
   7 var goalview;
   8 var filename;
   9 var logarea;
  10 var advanceButton;
  11 var retractButton;
  12 var cursorButton;
  13 var bottomButton;
  14 var dialogBox;
  15 var dialogTitle;
  16 var dialogContent;
  17 var metasenv = "";
  18 var lockedbackup = "";
  19 var matita;
  20
  21 function text_of_html(h)
  22 {
  23   if(document.all) {
  24      return h.innerText;
  25   } else {
  26      return h.textContent;
  27   }
  28 }
  29
  30 function unescape_html(s)
  31 {
  32   u = document.getElementById("unescape");
  33   u.innerHTML = s;
  34   return text_of_html(u)
  35 }
  36
  37 function filterByClass (elements,cname){
  38   var itemsfound = new Array;
  39   for(var i=0;i<elements.length;i++){
  40     if(elements[i].className == cname){
  41       itemsfound.push(elements[i]);
  42     }
  43   }
  44   return itemsfound;
  45 }
  46
  47 function initialize()
  48 {
  49   if (readCookie("session") == null) {
  50     window.location = "/login.html"
  51   } else {
  52     body = document.body;
  53     titlebar = document.getElementById("titlebar");
  54     matitaTitle = document.getElementById("matitaTitle");
  55     apparea = document.getElementById("matitaapparea");
  56     locked = document.getElementById("locked");
  57     unlocked = document.getElementById("unlocked");
  58     toparea = document.getElementById("toparea");
  59     workarea = document.getElementById("workarea");
  60     scriptcell = document.getElementById("scriptcell");
  61     sidearea = document.getElementById("sidearea");
  62     disambcell = document.getElementById("disambcell");
  63     goalcell = document.getElementById("goalcell");
  64     goals = document.getElementById("goals");
  65     goalview = document.getElementById("goalview");
  66     filename = document.getElementById("filename");
  67     logarea = document.getElementById("logarea");
  68     advanceButton = document.getElementById("advance");
  69     retractButton = document.getElementById("retract");
  70     cursorButton = document.getElementById("cursor");
  71     bottomButton = document.getElementById("bottom");
  72     dialogBox = document.getElementById("dialogBox");
  73     uploadBox = document.getElementById("uploadBox");
  74     dialogTitle = document.getElementById("dialogTitle");
  75     dialogContent = document.getElementById("dialogContent");
  76
  77     matita = new Object();
  78     matita.disambMode = matita.proofMode = false;
  79
  80     // hide sequent view at start
  81     initializeLayout();
  82     updateSide();
  83
  84     changeFile("test.ma");
  85
  86     // initialize keyboard events in the unlocked script
  87     init_keyboard(unlocked);
  88
  89     init_autotraces();
  90
  91   }
  92 }
  93
  94 function init_autotraces() {
  95     $("#unlocked .autotactic").tooltip({
  96       delay: 0,
  97       showURL: false,
  98       bodyHandler: function() {
  99         return (trace_of($(this)[0]));
 100       }
 101     });
 102     $("#locked .autotactic").tooltip({
 103       delay: 0,
 104       showURL: false,
 105       bodyHandler: function() {
 106         return (trace_of($(this)[0]));
 107       }
 108     });
 109 }
 110
 111 function trace_of(node) {
 112   return text_of_html(filterByClass(node.childNodes,"autotrace")[0]);
 113 }
 114
 115 function changeFile(name) {
 116     current_fname = name;
 117     matitaTitle.innerHTML = "Matita - cic:/matita/" + name;
 118 }
 119
 120 function init_keyboard(target)
 121 {
 122     if (target.addEventListener)
 123     {
 124 //       target.addEventListener("keydown",keydown,false);
 125        target.addEventListener("keypress",keypress,false);
 126 //       target.addEventListener("keyup",keyup,false);
 127 //       target.addEventListener("textInput",textinput,false);
 128     }
 129     else if (target.attachEvent)
 130     {
 131 //       target.attachEvent("onkeydown", keydown);
 132        target.attachEvent("onkeypress", keypress);
 133 //       target.attachEvent("onkeyup", keyup);
 134 //       target.attachEvent("ontextInput", textinput);
 135     }
 136     else
 137     {
 138 //       target.onkeydown= keydown;
 139        target.onkeypress= keypress;
 140 //       target.onkeyup= keyup;
 141 //       target.ontextinput= textinput;   // probably doesn't work
 142     }
 143
 144 }
 145
 146 function keyval(n)
 147 {
 148     if (n == null) return 'undefined';
 149     var s= '' + n;
 150     if (n >= 32 && n < 127) s+= ' (' + String.fromCharCode(n) + ')';
 151     while (s.length < 9) s+= ' ';
 152     return s;
 153 }
 154
 155 function string_of_key(n)
 156 {
 157     if (n == null) return 'undefined';
 158     return String.fromCharCode(n);
 159 }
 160
 161 function pressmesg(w,e)
 162 {
 163    debug(w + '  keyCode=' + keyval(e.keyCode) +
 164                  ' which=' + keyval(e.which) +
 165                  ' charCode=' + keyval(e.charCode) +
 166                  '\n          shiftKey='+e.shiftKey
 167               + ' ctrlKey='+e.ctrlKey
 168               + ' altKey='+e.altKey
 169               + ' metaKey='+e.metaKey);
 170 }
 171
 172 function suppressdefault(e,flag)
 173 {
 174    if (flag)
 175    {
 176        if (e.preventDefault) e.preventDefault();
 177        if (e.stopPropagation) e.stopPropagation();
 178    }
 179    return !flag;
 180 }
 181
 182 function restoreSelection(r) {
 183     unlocked.focus();
 184     if (r != null) {
 185         if (window.getSelection)//non IE and there is already a selection
 186         {
 187             var s = window.getSelection();
 188             if (s.rangeCount > 0)
 189                 s.removeAllRanges();
 190             s.addRange(r);
 191         }
 192         else
 193             if (document.createRange)//non IE and no selection
 194             {
 195                 window.getSelection().addRange(r);
 196             }
 197             else
 198                 if (document.selection)//IE
 199                 {
 200                     r.select();
 201                 }
 202     }
 203 }
 204
 205 function lookup_tex(texmacro)
 206 {
 207   texmacro = texmacro.substring(1);
 208   return unescape(macro2utf8[texmacro]);
 209 }
 210
 211 function strip_tags(tagname,classname)
 212 {
 213     var tags = unlocked.getElementsByTagName(tagname);
 214     if (is_defined(classname)) {
 215         tags = filterByClass(tags,classname);
 216     }
 217     for (i = 0; i < tags.length; i++) {
 218         var children = tags[i].childNodes;
 219         for (j = 0; j < children.length; j++) {
 220             tags[i].parentNode.insertBefore(children[j],tags[i]);
 221         }
 222     }
 223     while (tags.length > 0) {
 224       tags[0].parentNode.removeChild(tags[0]);
 225     }
 226 }
 227
 228 function strip_interpr() {
 229         strip_tags("A");
 230         alert("strip_interpr ended");
 231 }
 232
 233 function keypress(e)
 234 {
 235    if (!e) e= event;
 236    pressmesg('keypress',e);
 237    var s = string_of_key(e.charCode);
 238    strip_tags("span","error");
 239    if (s == " ") {
 240         j = getCursorPos();
 241         i = unlocked.innerHTML.html_to_matita().lastIndexOf('\\',j);
 242         if (i >= 0) {
 243           match = unlocked.innerHTML.html_to_matita().substring(i,j);
 244           sym = unescape_html(lookup_tex(match));
 245           if (sym != "undefined") {
 246              if (window.getSelection) { // non IE
 247                 savedRange.setStart(savedsc,savedso - (j-i));
 248                 savedRange.deleteContents();
 249                 savedRange.insertNode(document.createTextNode(sym));
 250                 savedsc.parentNode.normalize();
 251                 if (savedRange.collapsed) { // Mozilla
 252                   savedRange.setEnd(savedsc,savedRange.endOffset + sym.length);
 253                 }
 254                 savedRange.collapse(false);
 255              } else {
 256                 savedRange.moveStart(i-j);
 257                 savedRange.text(sym);
 258                 savedRange.collapse(false);
 259              }
 260              restoreSelection(savedRange);
 261              return suppressdefault(e,true);
 262           }
 263           else {
 264              // restoreSelection(0);
 265              return suppressdefault(e,false);
 266           }
 267         }
 268         else return suppressdefault(e,false);
 269    } else {
 270         return suppressdefault(e,false);
 271    }
 272 }
 273
 274 var logtxt = "";
 275
 276 function debug(txt)
 277 {
 278         // internet explorer (v.9) doesn't work with innerHTML
 279         // but google chrome's innerText is, in a sense, "write only"
 280         // what should we do?
 281         // logarea.innerText = txt + "\n" + logarea.innerText;
 282         logtxt = /* logtxt + "\n" +*/ txt;
 283 }
 284
 285 function showLog() {
 286   logWin = window.open( "", "Matita Log",
 287      "width=600,height=450,status,scrollbars,resizable,screenX=20,screenY=40,left=20,top=40");
 288   logWin.document.write('<html><head><title>Matita Log' + '</title></head>');
 289   logWin.document.write('<body><textarea style="width:100%;height:100%;">' +
 290     logtxt + '</textarea></body></html>');
 291   logWin.document.close();
 292 }
 293
 294 function listhd(l)
 295 {
 296         ar = l.split("#");
 297         debug("hd of '" + l + "' = '" + ar[0] + "'");
 298         return (ar[0]);
 299 }
 300
 301 function listtl(l)
 302 {
 303         i = l.indexOf("#");
 304         tl = l.substr(i+1);
 305         debug("tl of '" + l + "' = '" + tl + "'");
 306         return (tl);
 307 }
 308
 309 function listcons(x,l)
 310 {
 311         debug("cons '" + x + "' on '" + l + "'");
 312         return (x + "#" + l);
 313 }
 314
 315 function listnil()
 316 {
 317         return ("");
 318 }
 319
 320 function list_append(l1,l2)
 321 { return (l1 + l2) }
 322
 323 function is_nil(l)
 324 {
 325         return (l == "");
 326 }
 327
 328 function fold_left (f,acc,l)
 329 {
 330         if (is_nil(l))
 331            { debug("'" + l + "' is fold end");
 332            return (acc); }
 333         else
 334            { debug("'" + l + "' is fold cons");
 335              return(fold_left (f,f(acc,(listhd(l))),listtl(l))); }
 336 }
 337
 338 function listiter (f,l)
 339 {
 340         if (is_nil(l))
 341         { debug("'" + l + "' is nil");
 342            return;
 343         }
 344         else
 345         {
 346            debug("'" + l + "' is not nil");
 347            f(listhd(l));
 348            listiter(f,listtl(l));
 349         }
 350 }
 351
 352 function listmap (f,l)
 353 {
 354         debug("listmap on " + l);
 355         if (is_nil(l))
 356            { debug("returning listnil");
 357              return(listnil());
 358            }
 359         else
 360            { debug("cons f(hd) map(f,tl)");
 361              return(f(listhd(l)) + "#" + listmap(f,listtl(l)));
 362            }
 363 }
 364
 365 var statements = listnil();
 366
 367 var goalarray;
 368 var metalist = listnil();
 369
 370 function pairmap (f,p)
 371 {
 372   debug("pairmap of '" + p + "'");
 373   ar = p.split("|");
 374   return (f(ar[0],ar[1]));
 375 }
 376
 377 function tripletmap (f,p)
 378 {
 379   debug("tripletmap of '" + p + "'");
 380   ar = p.split("|");
 381   return (f(ar[0],ar[1],ar[2]));
 382 }
 383
 384 function fst (p)
 385 {
 386   debug("fst");
 387   return (pairmap (function (a,b) { return (a); }, p));
 388 }
 389
 390 function p13 (p)
 391 {
 392   debug("p13");
 393   return (tripletmap (function (a,b,c) { return (a); }, p));
 394 }
 395
 396 function p23 (p)
 397 {
 398   debug("p23");
 399   return (tripletmap (function (a,b,c) { return (b); }, p));
 400 }
 401
 402 function p33 (p)
 403 {
 404   debug("f33");
 405   return (tripletmap (function (a,b,c) { return (c); }, p));
 406 }
 407
 408 function populate_goalarray(menv)
 409 {
 410   debug("metasenv.length = " + menv.length);
 411   if (menv.length == 0) {
 412       try {
 413           hideSequent();
 414       } catch (err) { };
 415   } else {
 416       showSequent();
 417       goalarray = new Array();
 418       metalist = listnil();
 419       var tmp_goallist = "";
 420       for (i = 0; i < menv.length; i++) {
 421         metano = menv[i].getAttribute("number");
 422         metaname = menv[i].childNodes[0].childNodes[0].data;
 423         goal = menv[i].childNodes[1].childNodes[0].data;
 424         debug ("found meta n. " + metano);
 425         debug ("found goal\nBEGIN" + goal + "\nEND");
 426         goalarray[metano] = goal;
 427         tmp_goallist = " <A href=\"javascript:switch_goal(" + metano + ")\">" + metaname + "</A>" + tmp_goallist;
 428         metalist = listcons(metano,metalist);
 429         debug ("goalarray[\"" + metano + "\"] = " + goalarray[metano]);
 430       }
 431       goals.innerHTML = tmp_goallist;
 432       debug("new metalist is '" + metalist + "'");
 433       if (is_nil(metalist)) {
 434         switch_goal();
 435       }
 436       else {
 437         switch_goal(listhd(metalist));
 438       }
 439   }
 440 }
 441
 442 function switch_goal(meta)
 443 {
 444   if (typeof meta == "undefined") {
 445     goalview.innerHTML = "";
 446   }
 447   else {
 448     debug("switch_goal " + meta + "\n" + goalarray[meta]);
 449     goalview.innerHTML = "<B>Goal ?" + meta + ":</B>\n\n" + goalarray[meta];
 450   }
 451 }
 452
 453 // the following is used to avoid escaping unicode, which results in
 454 // the server being unable to unescape the string
 455 String.prototype.sescape = function() {
 456         var patt1 = /%/gi;
 457         var patt2 = /=/gi;
 458         var patt3 = /&/gi;
 459         var patt4 = /\+/gi;
 460         var result = this;
 461         result = result.replace(patt1,"%25");
 462         result = result.replace(patt2,"%3D");
 463         result = result.replace(patt3,"%26");
 464         result = result.replace(patt4,"%2B");
 465         return (result);
 466 }
 467
 468 String.prototype.html_to_matita = function()
 469 {
 470         var patt1 = /<br(\/|)>/gi;
 471         var patt2 = /</gi
 472         var patt3 = />/gi
 473         var patt4 = /&lt;/gi;
 474         var patt5 = /&gt;/gi;
 475         var patt6 = /&nbsp;/gi;
 476         var result = this;
 477         result = result.replace(patt1,"\n");
 478         result = result.replace(patt2,"\005");
 479         result = result.replace(patt3,"\006");
 480         result = result.replace(patt4,"<");
 481         result = result.replace(patt5,">");
 482         result = result.replace(patt6," ");
 483         return (unescape(result));
 484 }
 485
 486 String.prototype.matita_to_html = function()
 487 {
 488         var patt1 = /</gi
 489         var patt2 = />/gi
 490         var patt3 = /\005/gi;
 491         var patt4 = /\006/gi;
 492         var result = this;
 493         result = result.replace(patt1,"&lt;");
 494         result = result.replace(patt2,"&gt;");
 495         result = result.replace(patt3,"<");
 496         result = result.replace(patt4,">");
 497         return (unescape(result));
 498 }
 499
 500 function pause()
 501 {
 502         advanceButton.disabled = true;
 503         retractButton.disabled = true;
 504         cursorButton.disabled = true;
 505         bottomButton.disabled = true;
 506 }
 507
 508 function resume()
 509 {
 510         advanceButton.disabled = false;
 511         retractButton.disabled = false;
 512         cursorButton.disabled = false;
 513         bottomButton.disabled = false;
 514 }
 515
 516 function is_defined(x)
 517 {
 518         return (typeof x != "undefined");
 519 }
 520
 521 /* servicename: name of the service being called
 522  * reqbody: text of the request
 523  * processResponse: processes the server response
 524  *     (takes the response text in input, undefined in case of error)
 525  */
 526 function callServer(servicename,processResponse,reqbody)
 527 {
 528         var req = null;
 529         // pause();
 530         if (window.XMLHttpRequest)
 531         {
 532                 req = new XMLHttpRequest();
 533         }
 534         else if (window.ActiveXObject)
 535         {
 536                 try {
 537                                 req = new ActiveXObject("Msxml2.XMLHTTP");
 538                 } catch (e)
 539                 {
 540                         try {
 541                                 req = new ActiveXObject("Microsoft.XMLHTTP");
 542                                 } catch (e) {}
 543                 }
 544         }
 545         req.onreadystatechange = function()
 546         {
 547
 548                 rs = req.readyState;
 549
 550                 if(rs == 4)
 551                 {
 552                         stat = req.status;
 553                         stxt = req.statusText;
 554                         if(stat == 200)
 555                         {
 556                           debug(req.responseText);
 557                           if (window.DOMParser) {
 558                             parser=new DOMParser();
 559                             xmlDoc=parser.parseFromString(req.responseText,"text/xml");
 560                           }
 561                           else // Internet Explorer
 562                           {
 563                             xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
 564                             xmlDoc.async="false";
 565                             xmlDoc.loadXML(req.responseText);
 566                           }
 567                           processResponse(xmlDoc);
 568                         } else {
 569                           processResponse();
 570                         }
 571                 }
 572         };
 573         req.open("POST", servicename); // + escape(unlocked.innerHTML), true);
 574         req.setRequestHeader("Content-type","application/x-www-form-urlencoded");
 575         if (reqbody) {
 576                 req.send(reqbody);
 577         } else {
 578                 req.send();
 579         }
 580
 581 }
 582
 583 function advanceForm1()
 584 {
 585         processor = function(xml) {
 586                 if (is_defined(xml)) {
 587                         var parsed = xml.getElementsByTagName("parsed")[0];
 588                         var ambiguity = xml.getElementsByTagName("ambiguity")[0];
 589                         var disamberr = xml.getElementsByTagName("disamberror")[0];
 590                         if (is_defined(parsed)) {
 591                         // debug("advance: received response\nBEGIN\n" + req.responseText + "\nEND");
 592                             var len = parseInt(parsed.getAttribute("length"));
 593                             // len0 = unlocked.innerHTML.length;
 594                             var unescaped = unlocked.innerHTML.html_to_matita();
 595                             var parsedtxt = parsed.childNodes[0].wholeText;
 596                             //parsedtxt = unescaped.substr(0,len);
 597                             var unparsedtxt = unescaped.substr(len);
 598                             lockedbackup += parsedtxt;
 599                             locked.innerHTML = lockedbackup;
 600                             unlocked.innerHTML = unparsedtxt.matita_to_html();
 601                             // len1 = unlocked.innerHTML.length;
 602                             // len2 = len0 - len1;
 603                             var len2 = parsedtxt.length;
 604                             var metasenv = xml.getElementsByTagName("meta");
 605                             populate_goalarray(metasenv);
 606                             init_autotraces();
 607                             statements = listcons(len2,statements);
 608                             unlocked.scrollIntoView(true);
 609                         }
 610                         else if (is_defined(ambiguity)) {
 611                             var start = parseInt(ambiguity.getAttribute("start"));
 612                             var stop = parseInt(ambiguity.getAttribute("stop"));
 613                             var choices = xml.getElementsByTagName("choice");
 614
 615                             matita.ambiguityStart = start;
 616                             matita.ambiguityStop = stop;
 617                             matita.unlockedbackup = unlocked.innerHTML.html_to_matita();
 618                             matita.interpretations = [];
 619
 620                             var unlockedtxt = unlocked.innerHTML.html_to_matita();
 621                             var pre = unlockedtxt.substring(0,start).matita_to_html();
 622                             var mid = unlockedtxt.substring(start,stop).matita_to_html();
 623                             var post = unlockedtxt.substring(stop).matita_to_html();
 624                             unlocked.innerHTML = pre +
 625                                     "<span class=\"error\" title=\"disambiguation error\">" +
 626                                     mid + "</span>" + post;
 627
 628                             var title = "<H3>Ambiguous input</H3>";
 629                             disambcell.innerHTML = title;
 630                             for (i = 0;i < choices.length;i++) {
 631                                 matita.interpretations[i] = new Object();
 632
 633                                 var href = choices[i].getAttribute("href");
 634                                 var title = choices[i].getAttribute("title");
 635                                 var desc = choices[i].childNodes[0].nodeValue;
 636
 637                                 matita.interpretations[i].href = href;
 638                                 matita.interpretations[i].title = title;
 639                                 matita.interpretations[i].desc = desc;
 640
 641                                 var choice = document.createElement("input");
 642                                 choice.setAttribute("type","radio");
 643                                 choice.setAttribute("name","interpr");
 644                                 choice.setAttribute("href",href);
 645                                 choice.setAttribute("title",title);
 646                                 if (i == 0) choice.setAttribute("checked","");
 647
 648                                 disambcell.appendChild(choice);
 649                                 disambcell.appendChild(document.createTextNode(desc));
 650                                 disambcell.appendChild(document.createElement("br"));
 651                             }
 652
 653                             var okbutton = document.createElement("input");
 654                             okbutton.setAttribute("type","button");
 655                             okbutton.setAttribute("value","OK");
 656                             okbutton.setAttribute("onclick","do_disambiguate()");
 657                             var cancelbutton = document.createElement("input");
 658                             cancelbutton.setAttribute("type","button");
 659                             cancelbutton.setAttribute("value","Cancel");
 660                             cancelbutton.setAttribute("onclick","cancel_disambiguate()");
 661
 662                             disambcell.appendChild(okbutton);
 663                             disambcell.appendChild(cancelbutton);
 664
 665                             disable_toparea();
 666
 667                             matita.disambMode = true;
 668                             updateSide();
 669                         }
 670                         else if (is_defined(disamberr)) {
 671                             set_cps(disamberr.childNodes);
 672                             matita.unlockedbackup = unlocked.innerHTML.html_to_matita();
 673                             matita.disambMode = true;
 674                             disable_toparea();
 675                             next_cp(0);
 676                         }
 677                         else {
 678                             var error = xml.getElementsByTagName("error")[0];
 679                             unlocked.innerHTML = error.childNodes[0].wholeText;
 680                             // debug(xml.childNodes[0].nodeValue);
 681                         }
 682                 } else {
 683                         debug("advance failed");
 684                 }
 685                 resume();
 686         };
 687         pause();
 688         callServer("advance",processor,"body=" + (unlocked.innerHTML.html_to_matita()).sescape());
 689
 690 }
 691
 692 // get or set <choicepoint>'s (in case of disamb error)
 693 function get_cps() {
 694         return matita.choicepoints
 695 }
 696
 697 function set_cps(cps) {
 698         matita.choicepoints = cps;
 699 }
 700
 701 // get radio buttons for <choice>'s in a given cp
 702 function get_choice_opts(i) {
 703    var res = [];
 704    var choices = get_cps()[i].childNodes;
 705    for (var j = 0;j < choices.length;j++) {
 706       var href = choices[j].getAttribute("href");
 707       var title = choices[j].getAttribute("title");
 708       var desc;
 709       if (is_defined(title)) {
 710            desc = title;
 711       } else if (is_defined(href)) {
 712            desc = href;
 713       } else {
 714            desc = "Preliminary error";
 715       }
 716
 717       res[j] = document.createElement("input");
 718       res[j].setAttribute("type","radio");
 719       res[j].setAttribute("name","choice");
 720       res[j].setAttribute("choicepointno",i);
 721       res[j].setAttribute("choiceno",j);
 722       res[j].setAttribute("href",href);
 723       res[j].setAttribute("title",title);
 724       res[j].setAttribute("desc",desc);
 725
 726       if (j == 0) res[j].setAttribute("checked","");
 727   }
 728   return res;
 729 }
 730
 731 // get radio buttons for <failure>'s in a given choice
 732 function get_failure_opts(i,j) {
 733    var res = [];
 734    var failures = get_cps()[i].childNodes[j].childNodes;
 735    for (var k = 0;k < failures.length;k++) {
 736       var start = failures[k].getAttribute("start");
 737       var stop = failures[k].getAttribute("stop");
 738       var title = failures[k].getAttribute("title");
 739
 740       res[k] = document.createElement("input");
 741       res[k].setAttribute("type","radio");
 742       res[k].setAttribute("name","failure");
 743       res[k].setAttribute("choicepointno",i);
 744       res[k].setAttribute("choiceno",j);
 745       res[k].setAttribute("failureno",k);
 746       res[k].setAttribute("start",start);
 747       res[k].setAttribute("stop",stop);
 748       res[k].setAttribute("title",title);
 749
 750       if (k == 0) res[k].setAttribute("checked","");
 751   }
 752   return res;
 753 }
 754
 755 function next_cp(curcp) {
 756         var cp = get_cps()[curcp];
 757         var start = parseInt(cp.getAttribute("start"));
 758         var stop = parseInt(cp.getAttribute("stop"));
 759
 760         matita.errorStart = start;
 761         matita.errorStop = stop;
 762         // matita.unlockedbackup = unlocked.innerHTML.html_to_matita();
 763
 764         var unlockedtxt = matita.unlockedbackup;
 765         var pre = unlockedtxt.substring(0,start).matita_to_html();
 766         var mid = unlockedtxt.substring(start,stop).matita_to_html();
 767         var post = unlockedtxt.substring(stop).matita_to_html();
 768         unlocked.innerHTML = pre +
 769                 "<span class=\"error\" title=\"disambiguation failed\">" +
 770                 mid + "</span>" + post;
 771
 772         var title = "<H3>Disambiguation failed</H3>";
 773         disambcell.innerHTML = title;
 774         var choices = get_choice_opts(curcp);
 775         for (var i = 0;i < choices.length;i++) {
 776             disambcell.appendChild(choices[i]);
 777             disambcell.appendChild(document.createTextNode(choices[i].getAttribute("desc")));
 778             disambcell.appendChild(document.createElement("br"));
 779         }
 780
 781         // update index of the next choicepoint
 782         new_curcp = (curcp + 1) % get_cps().length;
 783
 784         var okbutton = document.createElement("input");
 785         okbutton.setAttribute("type","button");
 786         okbutton.setAttribute("value","OK");
 787         okbutton.setAttribute("onclick","show_failures()");
 788         var cancelbutton = document.createElement("input");
 789         cancelbutton.setAttribute("type","button");
 790         cancelbutton.setAttribute("value","Close");
 791         cancelbutton.setAttribute("onclick","cancel_disambiguate()");
 792         var tryagainbutton = document.createElement("input");
 793         tryagainbutton.setAttribute("type","button");
 794         if (new_curcp > 0) {
 795             tryagainbutton.setAttribute("value","Try something else");
 796         } else {
 797             tryagainbutton.setAttribute("value","Restart");
 798         }
 799         tryagainbutton.setAttribute("onclick","next_cp(" + new_curcp + ")");
 800
 801         disambcell.appendChild(okbutton);
 802         disambcell.appendChild(tryagainbutton);
 803         disambcell.appendChild(cancelbutton);
 804
 805         //disable_toparea();
 806
 807         //matita.disambMode = true;
 808         updateSide();
 809
 810 }
 811
 812 function show_failures() {
 813
 814         var choice = document.getElementsByName("choice")[get_checked_index("choice")];
 815         var cpno = parseInt(choice.getAttribute("choicepointno"));
 816         var choiceno = parseInt(choice.getAttribute("choiceno"));
 817         var choicedesc = choice.getAttribute("desc");
 818
 819         var title = "<H3>Disambiguation failed</H3>";
 820         var subtitle = "<p>Errors at node " + cpno + " = " + choicedesc + "</p>";
 821
 822         disambcell.innerHTML = title + subtitle;
 823         var failures = get_failure_opts(cpno,choiceno);
 824         for (var i = 0;i < failures.length;i++) {
 825             disambcell.appendChild(failures[i]);
 826             disambcell.appendChild(document.createTextNode(failures[i].getAttribute("title")));
 827             disambcell.appendChild(document.createElement("br"));
 828         }
 829
 830         var okbutton = document.createElement("input");
 831         okbutton.setAttribute("type","button");
 832         okbutton.setAttribute("value","Show error loc");
 833         okbutton.setAttribute("onclick","show_err()");
 834         var cancelbutton = document.createElement("input");
 835         cancelbutton.setAttribute("type","button");
 836         cancelbutton.setAttribute("value","Close");
 837         cancelbutton.setAttribute("onclick","cancel_disambiguate()");
 838         var backbutton = document.createElement("input");
 839         backbutton.setAttribute("type","button");
 840         backbutton.setAttribute("value","<< Back");
 841         backbutton.setAttribute("onclick","next_cp(" + cpno + ")");
 842
 843         disambcell.appendChild(backbutton);
 844         disambcell.appendChild(okbutton);
 845         disambcell.appendChild(cancelbutton);
 846
 847 }
 848
 849 function show_err() {
 850         var radios = document.getElementsByName("failure");
 851         for (i = 0; i < radios.length; i++) {
 852             if (radios[i].checked) {
 853                 var start = radios[i].getAttribute("start");
 854                 var stop = radios[i].getAttribute("stop");
 855                 var title = radios[i].getAttribute("title");
 856                 var unlockedtxt = matita.unlockedbackup;
 857                 var pre = unlockedtxt.substring(0,start).matita_to_html();
 858                 var mid = unlockedtxt.substring(start,stop).matita_to_html();
 859                 var post = unlockedtxt.substring(stop).matita_to_html();
 860                 unlocked.innerHTML = pre +
 861                         "<span class=\"error\" title=\"Disambiguation failure\">" +
 862                         mid + "</span>" + post;
 863                 break;
 864             }
 865         }
 866 }
 867
 868 function gotoBottom()
 869 {
 870         processor = function(xml) {
 871                 if (is_defined(xml)) {
 872                         // debug("goto bottom: received response\nBEGIN\n" + req.responseText + "\nEND");
 873                         var parsed = xml.getElementsByTagName("parsed");
 874                         var localized = xml.getElementsByTagName("localized")[0];
 875                         var ambiguity = xml.getElementsByTagName("ambiguity")[0];
 876                         var generic_err = xml.getElementsByTagName("error")[0];
 877                         for (var i = 0;i < parsed.length; i++) {
 878                           var len = parsed[i].getAttribute("length");
 879                           // len0 = unlocked.innerHTML.length;
 880                           var unescaped = unlocked.innerHTML.html_to_matita();
 881                           // the browser may decide to split textnodes: use wholeText!
 882                           var parsedtxt = parsed[i].childNodes[0].wholeText;
 883                           //parsedtxt = unescaped.substr(0,len);
 884                           var unparsedtxt = unescaped.substr(len);
 885                           lockedbackup += parsedtxt;
 886                           locked.innerHTML = lockedbackup; //.matita_to_html();
 887                           unlocked.innerHTML = unparsedtxt.matita_to_html();
 888                           // len1 = unlocked.innerHTML.length;
 889                           var len2 = parsedtxt.length;
 890                           statements = listcons(len2,statements);
 891                         }
 892                         unlocked.scrollIntoView(true);
 893                         metasenv = xml.getElementsByTagName("meta");
 894                         init_autotraces();
 895                         populate_goalarray(metasenv);
 896
 897                         if (is_defined(ambiguity)) {
 898                             var start = parseInt(ambiguity.getAttribute("start"));
 899                             var stop = parseInt(ambiguity.getAttribute("stop"));
 900                             var choices = xml.getElementsByTagName("choice");
 901
 902                             matita.ambiguityStart = start;
 903                             matita.ambiguityStop = stop;
 904                             matita.unlockedbackup = unlocked.innerHTML.html_to_matita();
 905                             matita.interpretations = [];
 906
 907                             var unlockedtxt = unlocked.innerHTML.html_to_matita();
 908                             var pre = unlockedtxt.substring(0,start).matita_to_html();
 909                             var mid = unlockedtxt.substring(start,stop).matita_to_html();
 910                             var post = unlockedtxt.substring(stop).matita_to_html();
 911                             unlocked.innerHTML = pre +
 912                                     "<span class=\"error\" title=\"disambiguation error\">" +
 913                                     mid + "</span>" + post;
 914
 915                             var title = "<H3>Ambiguous input</H3>";
 916                             disambcell.innerHTML = title;
 917                             for (i = 0;i < choices.length;i++) {
 918                                 matita.interpretations[i] = new Object();
 919
 920                                 var href = choices[i].getAttribute("href");
 921                                 var title = choices[i].getAttribute("title");
 922                                 var desc = choices[i].childNodes[0].nodeValue;
 923
 924                                 matita.interpretations[i].href = href;
 925                                 matita.interpretations[i].title = title;
 926                                 matita.interpretations[i].desc = desc;
 927
 928                                 var choice = document.createElement("input");
 929                                 choice.setAttribute("type","radio");
 930                                 choice.setAttribute("name","interpr");
 931                                 choice.setAttribute("href",href);
 932                                 choice.setAttribute("title",title);
 933                                 if (i == 0) choice.setAttribute("checked","");
 934
 935                                 disambcell.appendChild(choice);
 936                                 disambcell.appendChild(document.createTextNode(desc));
 937                                 disambcell.appendChild(document.createElement("br"));
 938                             }
 939
 940                             var okbutton = document.createElement("input");
 941                             okbutton.setAttribute("type","button");
 942                             okbutton.setAttribute("value","OK");
 943                             okbutton.setAttribute("onclick","do_disambiguate()");
 944                             var cancelbutton = document.createElement("input");
 945                             cancelbutton.setAttribute("type","button");
 946                             cancelbutton.setAttribute("value","Cancel");
 947                             cancelbutton.setAttribute("onclick","cancel_disambiguate()");
 948
 949                             disambcell.appendChild(okbutton);
 950                             disambcell.appendChild(cancelbutton);
 951
 952                             disable_toparea();
 953
 954                             matita.disambMode = true;
 955                             updateSide();
 956                         }
 957                         if (is_defined(localized)) {
 958                             unlocked.innerHTML = localized.wholeText;
 959                         }
 960                         if (is_defined(generic_err)) {
 961                             debug("Unmanaged error:\n" ^ generic_err.wholeText);
 962                         }
 963                 } else {
 964                         debug("goto bottom failed");
 965                 }
 966                 resume();
 967         };
 968         pause();
 969         callServer("bottom",processor,"body=" + (unlocked.innerHTML.html_to_matita()).sescape());
 970 }
 971
 972
 973 function gotoTop()
 974 {
 975         processor = function(xml) {
 976                 if (is_defined(xml)) {
 977                   if (xml.childNodes[0].textContent != "ok") {
 978                      debug("goto top failed");
 979                   }
 980                   else
 981                         statements = listnil();
 982                         /*
 983                         lockedlen = locked.innerHTML.length - statementlen;
 984                         statement = locked.innerHTML.substr(lockedlen, statementlen);
 985                         locked.innerHTML = locked.innerHTML.substr(0,lockedlen);
 986                         unlocked.innerHTML = statement + unlocked.innerHTML;
 987                         */
 988                         unlocked.innerHTML = lockedbackup + unlocked.innerHTML;
 989                         lockedbackup = "";
 990                         locked.innerHTML = lockedbackup;
 991                         init_autotraces();
 992                         hideSequent();
 993                         unlocked.scrollIntoView(true);
 994                 } else {
 995                         debug("goto top failed");
 996                 }
 997                 resume();
 998         };
 999         pause();
1000         callServer("top",processor,"body=" + (unlocked.innerHTML.html_to_matita()).sescape());
1001
1002 }
1003 function gotoPos(offset)
1004 {
1005         if (!is_defined(offset)) {
1006                 offset = getCursorPos();
1007         }
1008         processor = function(xml) {
1009                 if (is_defined(xml)) {
1010                         parsed = xml.getElementsByTagName("parsed")[0];
1011                         len = parseInt(parsed.getAttribute("length"));
1012                         // len0 = unlocked.innerHTML.length;
1013                         unescaped = unlocked.innerHTML.html_to_matita();
1014                         parsedtxt = parsed.childNodes[0].wholeText;
1015                         //parsedtxt = unescaped.substr(0,len);
1016                         unparsedtxt = unescaped.substr(len);
1017                         lockedbackup += parsedtxt;
1018                         locked.innerHTML = lockedbackup; //.matita_to_html();
1019                         unlocked.innerHTML = unparsedtxt.matita_to_html();
1020                         // len1 = unlocked.innerHTML.length;
1021                         len2 = parsedtxt.length;
1022                         metasenv = xml.getElementsByTagName("meta");
1023                         // populate_goalarray(metasenv);
1024                         statements = listcons(len2,statements);
1025                         unlocked.scrollIntoView(true);
1026                         // la populate non andrebbe fatta a ogni passo
1027                         if (offset <= len) {
1028                                 init_autotraces();
1029                                 populate_goalarray(metasenv);
1030                                 resume();
1031                         } else {
1032                                 gotoPos(offset - len);
1033                         }
1034                 } else {
1035                         init_autotraces();
1036                         unlocked.scrollIntoView(true);
1037                         populate_goalarray(metasenv);
1038                         resume();
1039                 }
1040         }
1041         pause();
1042         callServer("advance",processor,"body=" + (unlocked.innerHTML.html_to_matita()).sescape());
1043 }
1044
1045 function retract()
1046 {
1047         processor = function(xml) {
1048                 if (typeof xml != "undefined") {
1049                         // debug("advance: received response\nBEGIN\n" + req.responseText + "\nEND");
1050                         statementlen = parseInt(listhd(statements));
1051                         statements = listtl(statements);
1052                         /*
1053                         lockedlen = locked.innerHTML.length - statementlen;
1054                         statement = locked.innerHTML.substr(lockedlen, statementlen);
1055                         locked.innerHTML = locked.innerHTML.substr(0,lockedlen);
1056                         unlocked.innerHTML = statement + unlocked.innerHTML;
1057                         */
1058                         lockedlen = lockedbackup.length - statementlen;
1059                         statement = lockedbackup.substr(lockedlen, statementlen);
1060                         lockedbackup = lockedbackup.substr(0,lockedlen);
1061                         locked.innerHTML = lockedbackup;
1062                         unlocked.innerHTML = statement + unlocked.innerHTML;
1063                         metasenv = xml.getElementsByTagName("meta");
1064                         init_autotraces();
1065                         populate_goalarray(metasenv);
1066                         unlocked.scrollIntoView(true);
1067                 } else {
1068                         debug("retract failed");
1069                 }
1070                 resume();
1071         };
1072         debug("retract 1");
1073         pause();
1074         callServer("retract",processor);
1075         debug("retract 2");
1076 }
1077
1078 function openFile()
1079 {
1080         processor = function(xml)
1081         {
1082                 if (is_defined(xml)) {
1083                         lockedbackup = "";
1084                         locked.innerHTML = lockedbackup;
1085                         unlocked.innerHTML = xml.documentElement.wholeText;
1086                 } else {
1087                         debug("file open failed");
1088                 }
1089         };
1090         callServer("open",processor,"file=" + escape(filename.value));
1091 }
1092
1093 function retrieveFile(thefile)
1094 {
1095         processor = function(xml)
1096         {
1097                 if (is_defined(xml)) {
1098                         changeFile(thefile);
1099                         lockedbackup = ""
1100                         locked.innerHTML = lockedbackup;
1101                         // code originally used in google chrome (problems with mozilla)
1102                         // debug(xml.getElementsByTagName("file")[0].childNodes[0].nodeValue);
1103                         // unlocked.innerHTML = xml.getElementsByTagName("file")[0].childNodes[0].nodeValue;
1104                         debug(xml.childNodes[0].textContent);
1105                         if (document.all) { // IE
1106                           unlocked.innerHTML = xml.childNodes[0].text;
1107                         } else {
1108                           unlocked.innerHTML = xml.childNodes[0].textContent;
1109                         }
1110                         init_autotraces();
1111
1112                 } else {
1113                         debug("file open failed");
1114                 }
1115         };
1116         abortDialog();
1117         callServer("open",processor,"file=" + escape(thefile));
1118 }
1119
1120 function showLibrary(title,callback,reloadDialog)
1121 {
1122         var req = null;
1123         dialogBox.reload = reloadDialog;
1124         // pause();
1125         if (window.XMLHttpRequest)
1126         {
1127                 req = new XMLHttpRequest();
1128         }
1129         else if (window.ActiveXObject)
1130         {
1131                 try {
1132                                 req = new ActiveXObject("Msxml2.XMLHTTP");
1133                 } catch (e)
1134                 {
1135                         try {
1136                                 req = new ActiveXObject("Microsoft.XMLHTTP");
1137                                 } catch (e) {}
1138                 }
1139         }
1140         req.onreadystatechange = function()
1141         {
1142
1143                 rs = req.readyState;
1144
1145                 if(rs == 4)
1146                 {
1147                         stat = req.status;
1148                         stxt = req.statusText;
1149                         if(stat == 200)
1150                         {
1151                           debug(req.responseText);
1152                           showDialog("<H2>" + title + "</H2>",req.responseText, callback);
1153                         }
1154                 }
1155         };
1156         req.open("POST", "viewlib"); // + escape(unlocked.innerHTML), true);
1157         req.setRequestHeader("Content-type","application/x-www-form-urlencoded");
1158         req.send();
1159
1160 }
1161
1162 function uploadDialog()
1163 {
1164         uploadBox.style.display = "block";
1165 }
1166
1167 function uploadOK()
1168 {
1169    var file = document.getElementById("uploadFilename").files[0];
1170    if (file) {
1171        var filecontent = file.getAsText("UTF-8");
1172        locked.innerHTML = lockedbackup;
1173        unlocked.innerHTML = filecontent;
1174        uploadBox.style.display = "none";
1175    }
1176 //   if (file) {
1177 //      var reader = new FileReader();
1178 //      reader.readAsText(file, "UTF-8");
1179 //       reader.onloadend = function (evt) {
1180 //         lockedbackup = "";
1181 //           locked.innerHTML = lockedbackup
1182 //           unlocked.innerHTML = evt.target.result;
1183 //           uploadBox.style.display = "none";
1184 //       }
1185 //       reader.onerror = function (evt) {
1186 //         debug("file open failed");
1187 //           uploadBox.style.display = "none";
1188 //      }
1189 //   }
1190 }
1191
1192 function openDialog()
1193 {
1194         callback = function (fname) { retrieveFile(fname); };
1195         showLibrary("Open file", callback, openDialog);
1196 }
1197
1198 function saveDialog()
1199 {
1200         callback = function (fname) {
1201           abortDialog();
1202           saveFile(fname,
1203                    (locked.innerHTML.html_to_matita()).sescape(),
1204                    (unlocked.innerHTML.html_to_matita()).sescape(),
1205                    false,saveDialog);
1206         };
1207         showLibrary("Save file as", callback, saveDialog);
1208 }
1209
1210 function newDialog()
1211 {
1212         callback = function (fname) {
1213           abortDialog();
1214           saveFile(fname,"","",false,newDialog,true);
1215         };
1216         showLibrary("Create new file", callback, newDialog);
1217 }
1218
1219
1220 function saveFile(fname,lockedtxt,unlockedtxt,force,reloadDialog,reloadFile)
1221 {
1222         if (!is_defined(reloadFile)) { reloadFile = true };
1223         if (!is_defined(fname)) {
1224             fname = current_fname;
1225             lockedtxt = (locked.innerHTML.html_to_matita()).sescape();
1226             unlockedtxt = (unlocked.innerHTML.html_to_matita()).sescape();
1227             force = true;
1228             // when force is true, reloadDialog is not needed
1229         }
1230         processor = function(xml) {
1231                 if (is_defined(xml)) {
1232                   if (xml.childNodes[0].textContent != "ok") {
1233                     if (confirm("File already exists. All existing data will be lost.\nDo you want to proceed anyway?")) {
1234                        saveFile(fname,lockedtxt,unlockedtxt,true,reloadDialog,reloadFile);
1235                     } else {
1236                       reloadDialog();
1237                     }
1238                   } else {
1239                     changeFile(fname);
1240                     debug("file saved!");
1241                     if (reloadFile) { retrieveFile(fname); }
1242                   }
1243                 } else {
1244                         debug("save file failed");
1245                 }
1246                 resume();
1247         };
1248         if (is_defined(fname)) {
1249           pause();
1250           callServer("save",processor,"file=" + escape(fname) +
1251                                     "&locked=" + lockedtxt +
1252                                     "&unlocked=" + unlockedtxt +
1253                                     "&force=" + force);
1254         }
1255         else { debug("no file selected"); }
1256 }
1257
1258 function createDir() {
1259    abortDialog();
1260    dirname = prompt("New directory name:\ncic:/matita/","newdir");
1261    if (dirname != null) {
1262         processor = function(xml) {
1263                 if (is_defined(xml)) {
1264                   if (xml.childNodes[0].textContent != "ok") {
1265                       alert("An error occurred :-(");
1266                   }
1267                 } else {
1268                       alert("An error occurred :-(");
1269                 }
1270                 dialogBox.reload();
1271         };
1272         pause();
1273         callServer("save",processor,"file=" + escape(dirname) +
1274                                     "&locked=&unlocked=&force=false&dir=true");
1275    } else {
1276       dialogBox.reload();
1277    }
1278 }
1279
1280 function commitAll()
1281 {
1282         processor = function(xml) {
1283                 if (is_defined(xml)) {
1284                         debug(xml.getElementsByTagName("details")[0].textContent);
1285                         alert("Commit executed: see details in the log.\n\n" +
1286                               "NOTICE: this message does NOT imply (yet) that the commit was successful.");
1287                 } else {
1288                         alert("Commit failed!");
1289                 }
1290                 resume();
1291         };
1292         pause();
1293         callServer("commit",processor);
1294 }
1295
1296 function updateAll()
1297 {
1298         processor = function(xml) {
1299                 if (is_defined(xml)) {
1300                         alert("Update executed.\n\n" +
1301                               "Details:\n" +
1302                               xml.getElementsByTagName("details")[0].textContent);
1303                 } else {
1304                         alert("Update failed!");
1305                 }
1306                 resume();
1307         };
1308         pause();
1309         callServer("update",processor);
1310 }
1311
1312 var goalcell;
1313
1314 function hideSequent() {
1315         matita.proofMode = false;
1316         updateSide();
1317 }
1318
1319 function showSequent() {
1320         matita.proofMode = true;
1321         updateSide();
1322 }
1323
1324 function showDialog(title,content,callback) {
1325   dialogTitle.innerHTML = title;
1326   dialogContent.innerHTML = content;
1327   dialogBox.callback = callback;
1328
1329   //Get the screen height and width
1330   var maskHeight = $(document).height();
1331   var maskWidth = $(window).width();
1332
1333   //Set heigth and width to mask to fill up the whole screen
1334   $('#mask').css({'width':maskWidth,'height':maskHeight});
1335
1336   //transition effect
1337   $('#mask').fadeIn(100);
1338   $('#mask').fadeTo(200,0.8);
1339
1340   //Get the window height and width
1341   var winH = $(window).height();
1342   var winW = $(window).width();
1343
1344   //Set the popup window to center
1345   $('#dialogBox').css('top',  winH/2-$('#dialogBox').height()/2);
1346   $('#dialogBox').css('left', winW/2-$('#dialogBox').width()/2);
1347
1348   //transition effect
1349   $('#dialogBox').fadeIn(200);
1350
1351   dialogBox.style.display = "block";
1352 }
1353
1354 function abortDialog(dialog) {
1355   $('#mask').hide();
1356   dialogBox.style.display = "none";
1357 }
1358
1359 function removeElement(id) {
1360   var element = document.getElementById(id);
1361   element.parentNode.removeChild(element);
1362 }
1363
1364 var savedsc;
1365 var savedso;
1366
1367 function getCursorPos() {
1368   var cursorPos;
1369   if (window.getSelection) {
1370     var selObj = window.getSelection();
1371     savedRange = selObj.getRangeAt(0);
1372     savedsc = savedRange.startContainer;
1373     savedso = savedRange.startOffset;
1374     //cursorPos =  findNode(selObj.anchorNode.parentNode.childNodes, selObj.anchorNode) + selObj.anchorOffset;
1375     cursorPos =  findNode(unlocked.childNodes, selObj.anchorNode,0) + selObj.anchorOffset;
1376     /* FIXME the following works wrong in Opera when the document is longer than 32767 chars */
1377     return(cursorPos);
1378   }
1379   else if (document.selection) {
1380     savedRange = document.selection.createRange();
1381     var bookmark = savedRange.getBookmark();
1382     /* FIXME the following works wrong when the document is longer than 65535 chars */
1383     cursorPos = bookmark.charCodeAt(2) - 11; /* Undocumented function [3] */
1384     return(cursorPos);
1385   }
1386 }
1387
1388 function findNode(list, node, acc) {
1389   for (var i = 0; i < list.length; i++) {
1390     if (list[i] == node) {
1391    //   debug("success " + i);
1392       return acc;
1393     }
1394     if (list[i].hasChildNodes()) {
1395        try {
1396    //      debug("recursion on node " + i);
1397          return (findNode(list[i].childNodes,node,acc))
1398        }
1399        catch (e) { /* debug("recursion failed"); */ }
1400     }
1401     sandbox = document.getElementById("sandbox");
1402     dup = list[i].cloneNode(true);
1403     sandbox.appendChild(dup);
1404 //    debug("fail " + i + ": " + sandbox.innerHTML);
1405     acc += sandbox.innerHTML.html_to_matita().length;
1406     sandbox.removeChild(dup);
1407   }
1408   throw "not found";
1409 }
1410
1411 function test () {
1412   debug("cursor test: " + unlocked.innerHTML.substr(0,getCursorPos()));
1413 }
1414
1415 function get_checked_index(name) {
1416         var radios = document.getElementsByName(name);
1417         for (i = 0; i < radios.length; i++) {
1418             if (radios[i].checked) {
1419                     return i;
1420             }
1421         }
1422         return null;
1423 }
1424
1425 function cancel_disambiguate() {
1426         matita.disambMode = false;
1427         $('#whitemask').hide();
1428         updateSide();
1429 }
1430
1431 function do_disambiguate() {
1432         var i = get_checked_index("interpr");
1433         if (i != null) {
1434             var pre = matita.unlockedbackup
1435                       .substring(0,matita.ambiguityStart).matita_to_html();
1436             var mid = matita.unlockedbackup
1437                       .substring(matita.ambiguityStart,matita.ambiguityStop)
1438                       .matita_to_html();
1439             var post = matita.unlockedbackup
1440                        .substring(matita.ambiguityStop).matita_to_html();
1441
1442             var href = matita.interpretations[i].href;
1443             var title = matita.interpretations[i].title;
1444
1445             if (is_defined(title)) {
1446                 mid = "<A href=\"" + href + "\" title=\"" + title + "\">" + mid + "</A>";
1447             } else {
1448                 mid = "<A href=\"" + href + "\">" + mid + "</A>";
1449             }
1450
1451             unlocked.innerHTML = pre + mid + post;
1452
1453             matita.disambMode = false;
1454             $('#whitemask').hide();
1455             updateSide();
1456         }
1457 }
1458
1459 function do_showerror() {
1460         var i = get_checked_index("choice");
1461         if (i != null) {
1462             var pre = matita.unlockedbackup
1463                       .substring(0,matita.ambiguityStart).matita_to_html();
1464             var mid = matita.unlockedbackup
1465                       .substring(matita.ambiguityStart,matita.ambiguityStop)
1466                       .matita_to_html();
1467             var post = matita.unlockedbackup
1468                        .substring(matita.ambiguityStop).matita_to_html();
1469
1470             var href = matita.interpretations[i].href;
1471             var title = matita.interpretations[i].title;
1472
1473             if (is_defined(title)) {
1474                 mid = "<A href=\"" + href + "\" title=\"" + title + "\">" + mid + "</A>";
1475             } else {
1476                 mid = "<A href=\"" + href + "\">" + mid + "</A>";
1477             }
1478
1479             unlocked.innerHTML = pre + mid + post;
1480
1481         }
1482 }
1483
1484 function readCookie(name) {
1485         var nameEQ = name + "=";
1486         var ca = document.cookie.split(';');
1487         for(var i=0;i < ca.length;i++) {
1488                 var c = ca[i];
1489                 while (c.charAt(0)==' ') c = c.substring(1,c.length);
1490                 if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
1491         }
1492         return null;
1493 }
1494
1495 function delete_cookie ( cookie_name )
1496 {
1497   var cookie_date = new Date();  // current date & time
1498   cookie_date.setTime ( cookie_date.getTime() - 1 );
1499   document.cookie = cookie_name += "=; expires=" + cookie_date.toGMTString();
1500 }
1501
1502 function delete_session()
1503 {
1504         delete_cookie("session");
1505 }
1506
1507 function disable_toparea() {
1508         var offset = $('#toparea').offset();
1509         $('#whitemask').css('top',offset.top);
1510         $('#whitemask').css('left',offset.left);
1511         $('#whitemask').css('width',$('#toparea').outerWidth() + "px");
1512         $('#whitemask').css('height',$('#toparea').outerHeight() + "px");
1513         $('#whitemask').fadeTo('fast',0.7);
1514 }