matitaB/matita/html/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     var tlen = tags.length; // preserving the value from removeChild operations
 215     if (is_defined(classname)) {
 216         tags = filterByClass(tags,classname);
 217     }
 218     for (i = 0; i < tlen; i++) {
 219         var children = tags[i].childNodes;
 220         for (j = 0; j < children.length; j++) {
 221             tags[i].parentNode.insertBefore(children[j],tags[i]);
 222         }
 223     }
 224     for (var i = 0; i < tlen; i++) {
 225       tags[0].parentNode.removeChild(tags[0]);
 226     }
 227 }
 228
 229 function strip_interpr() {
 230         strip_tags("A");
 231         alert("strip_interpr ended");
 232 }
 233
 234 function keypress(e)
 235 {
 236    if (!e) e= event;
 237    pressmesg('keypress',e);
 238    var s = string_of_key(e.charCode);
 239    strip_tags("span","error");
 240    if (s == " ") {
 241         j = getCursorPos();
 242         i = unlocked.innerHTML.html_to_matita().lastIndexOf('\\',j);
 243         if (i >= 0) {
 244           match = unlocked.innerHTML.html_to_matita().substring(i,j);
 245           sym = unescape_html(lookup_tex(match));
 246           if (sym != "undefined") {
 247              if (window.getSelection) { // non IE
 248                 savedRange.setStart(savedsc,savedso - (j-i));
 249                 savedRange.deleteContents();
 250                 savedRange.insertNode(document.createTextNode(sym));
 251                 savedsc.parentNode.normalize();
 252                 if (savedRange.collapsed) { // Mozilla
 253                   savedRange.setEnd(savedsc,savedRange.endOffset + sym.length);
 254                 }
 255                 savedRange.collapse(false);
 256              } else {
 257                 savedRange.moveStart(i-j);
 258                 savedRange.text(sym);
 259                 savedRange.collapse(false);
 260              }
 261              restoreSelection(savedRange);
 262              return suppressdefault(e,true);
 263           }
 264           else {
 265              // restoreSelection(0);
 266              return suppressdefault(e,false);
 267           }
 268         }
 269         else return suppressdefault(e,false);
 270    } else {
 271         return suppressdefault(e,false);
 272    }
 273 }
 274
 275 var logtxt = "";
 276
 277 function debug(txt)
 278 {
 279         // internet explorer (v.9) doesn't work with innerHTML
 280         // but google chrome's innerText is, in a sense, "write only"
 281         // what should we do?
 282         // logarea.innerText = txt + "\n" + logarea.innerText;
 283         logtxt = /* logtxt + "\n" +*/ txt;
 284 }
 285
 286 function showLog() {
 287   logWin = window.open( "", "Matita Log",
 288      "width=600,height=450,status,scrollbars,resizable,screenX=20,screenY=40,left=20,top=40");
 289   logWin.document.write('<html><head><title>Matita Log' + '</title></head>');
 290   logWin.document.write('<body><textarea style="width:100%;height:100%;">' +
 291     logtxt + '</textarea></body></html>');
 292   logWin.document.close();
 293 }
 294
 295 function listhd(l)
 296 {
 297         ar = l.split("#");
 298         debug("hd of '" + l + "' = '" + ar[0] + "'");
 299         return (ar[0]);
 300 }
 301
 302 function listtl(l)
 303 {
 304         i = l.indexOf("#");
 305         tl = l.substr(i+1);
 306         debug("tl of '" + l + "' = '" + tl + "'");
 307         return (tl);
 308 }
 309
 310 function listcons(x,l)
 311 {
 312         debug("cons '" + x + "' on '" + l + "'");
 313         return (x + "#" + l);
 314 }
 315
 316 function listnil()
 317 {
 318         return ("");
 319 }
 320
 321 function list_append(l1,l2)
 322 { return (l1 + l2) }
 323
 324 function is_nil(l)
 325 {
 326         return (l == "");
 327 }
 328
 329 function fold_left (f,acc,l)
 330 {
 331         if (is_nil(l))
 332            { debug("'" + l + "' is fold end");
 333            return (acc); }
 334         else
 335            { debug("'" + l + "' is fold cons");
 336              return(fold_left (f,f(acc,(listhd(l))),listtl(l))); }
 337 }
 338
 339 function listiter (f,l)
 340 {
 341         if (is_nil(l))
 342         { debug("'" + l + "' is nil");
 343            return;
 344         }
 345         else
 346         {
 347            debug("'" + l + "' is not nil");
 348            f(listhd(l));
 349            listiter(f,listtl(l));
 350         }
 351 }
 352
 353 function listmap (f,l)
 354 {
 355         debug("listmap on " + l);
 356         if (is_nil(l))
 357            { debug("returning listnil");
 358              return(listnil());
 359            }
 360         else
 361            { debug("cons f(hd) map(f,tl)");
 362              return(f(listhd(l)) + "#" + listmap(f,listtl(l)));
 363            }
 364 }
 365
 366 var statements = listnil();
 367
 368 var goalarray;
 369 var metalist = listnil();
 370
 371 function pairmap (f,p)
 372 {
 373   debug("pairmap of '" + p + "'");
 374   ar = p.split("|");
 375   return (f(ar[0],ar[1]));
 376 }
 377
 378 function tripletmap (f,p)
 379 {
 380   debug("tripletmap of '" + p + "'");
 381   ar = p.split("|");
 382   return (f(ar[0],ar[1],ar[2]));
 383 }
 384
 385 function fst (p)
 386 {
 387   debug("fst");
 388   return (pairmap (function (a,b) { return (a); }, p));
 389 }
 390
 391 function p13 (p)
 392 {
 393   debug("p13");
 394   return (tripletmap (function (a,b,c) { return (a); }, p));
 395 }
 396
 397 function p23 (p)
 398 {
 399   debug("p23");
 400   return (tripletmap (function (a,b,c) { return (b); }, p));
 401 }
 402
 403 function p33 (p)
 404 {
 405   debug("f33");
 406   return (tripletmap (function (a,b,c) { return (c); }, p));
 407 }
 408
 409 function populate_goalarray(menv)
 410 {
 411   debug("metasenv.length = " + menv.length);
 412   if (menv.length == 0) {
 413       try {
 414           hideSequent();
 415       } catch (err) { };
 416   } else {
 417       showSequent();
 418       goalarray = new Array();
 419       metalist = listnil();
 420       var tmp_goallist = "";
 421       for (i = 0; i < menv.length; i++) {
 422         metano = menv[i].getAttribute("number");
 423         metaname = menv[i].childNodes[0].childNodes[0].data;
 424         goal = menv[i].childNodes[1].childNodes[0].data;
 425         debug ("found meta n. " + metano);
 426         debug ("found goal\nBEGIN" + goal + "\nEND");
 427         goalarray[metano] = goal;
 428         tmp_goallist = " <A href=\"javascript:switch_goal(" + metano + ")\">" + metaname + "</A>" + tmp_goallist;
 429         metalist = listcons(metano,metalist);
 430         debug ("goalarray[\"" + metano + "\"] = " + goalarray[metano]);
 431       }
 432       goals.innerHTML = tmp_goallist;
 433       debug("new metalist is '" + metalist + "'");
 434       if (is_nil(metalist)) {
 435         switch_goal();
 436       }
 437       else {
 438         switch_goal(listhd(metalist));
 439       }
 440   }
 441 }
 442
 443 function switch_goal(meta)
 444 {
 445   if (typeof meta == "undefined") {
 446     goalview.innerHTML = "";
 447   }
 448   else {
 449     debug("switch_goal " + meta + "\n" + goalarray[meta]);
 450     goalview.innerHTML = "<B>Goal ?" + meta + ":</B>\n\n" + goalarray[meta];
 451   }
 452 }
 453
 454 // the following is used to avoid escaping unicode, which results in
 455 // the server being unable to unescape the string
 456 String.prototype.sescape = function() {
 457         var patt1 = /%/gi;
 458         var patt2 = /=/gi;
 459         var patt3 = /&/gi;
 460         var patt4 = /\+/gi;
 461         var result = this;
 462         result = result.replace(patt1,"%25");
 463         result = result.replace(patt2,"%3D");
 464         result = result.replace(patt3,"%26");
 465         result = result.replace(patt4,"%2B");
 466         return (result);
 467 }
 468
 469 String.prototype.html_to_matita = function()
 470 {
 471         var patt1 = /<br(\/|)>/gi;
 472         var patt2 = /</gi
 473         var patt3 = />/gi
 474         var patt4 = /&lt;/gi;
 475         var patt5 = /&gt;/gi;
 476         var patt6 = /&nbsp;/gi;
 477         var result = this;
 478         result = result.replace(patt1,"\n");
 479         result = result.replace(patt2,"\005");
 480         result = result.replace(patt3,"\006");
 481         result = result.replace(patt4,"<");
 482         result = result.replace(patt5,">");
 483         result = result.replace(patt6," ");
 484         return (unescape(result));
 485 }
 486
 487 String.prototype.matita_to_html = function()
 488 {
 489         var patt1 = /</gi
 490         var patt2 = />/gi
 491         var patt3 = /\005/gi;
 492         var patt4 = /\006/gi;
 493         var result = this;
 494         result = result.replace(patt1,"&lt;");
 495         result = result.replace(patt2,"&gt;");
 496         result = result.replace(patt3,"<");
 497         result = result.replace(patt4,">");
 498         return (unescape(result));
 499 }
 500
 501 function is_defined(x)
 502 {
 503         return (typeof x != "undefined");
 504 }
 505
 506 /* servicename: name of the service being called
 507  * reqbody: text of the request
 508  * processResponse: processes the server response
 509  *     (takes the response text in input, undefined in case of error)
 510  */
 511 function callServer(servicename,processResponse,reqbody)
 512 {
 513         var req = null;
 514         // pause();
 515         if (window.XMLHttpRequest)
 516         {
 517                 req = new XMLHttpRequest();
 518         }
 519         else if (window.ActiveXObject)
 520         {
 521                 try {
 522                                 req = new ActiveXObject("Msxml2.XMLHTTP");
 523                 } catch (e)
 524                 {
 525                         try {
 526                                 req = new ActiveXObject("Microsoft.XMLHTTP");
 527                                 } catch (e) {}
 528                 }
 529         }
 530         req.onreadystatechange = function()
 531         {
 532
 533                 rs = req.readyState;
 534
 535                 if(rs == 4)
 536                 {
 537                         stat = req.status;
 538                         stxt = req.statusText;
 539                         if(stat == 200)
 540                         {
 541                           debug(req.responseText);
 542                           if (window.DOMParser) {
 543                             parser=new DOMParser();
 544                             xmlDoc=parser.parseFromString(req.responseText,"text/xml");
 545                           }
 546                           else // Internet Explorer
 547                           {
 548                             xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
 549                             xmlDoc.async="false";
 550                             xmlDoc.loadXML(req.responseText);
 551                           }
 552                           processResponse(xmlDoc);
 553                         } else {
 554                           processResponse();
 555                         }
 556                 }
 557         };
 558         req.open("POST", servicename); // + escape(unlocked.innerHTML), true);
 559         req.setRequestHeader("Content-type","application/x-www-form-urlencoded");
 560         if (reqbody) {
 561                 req.send(reqbody);
 562         } else {
 563                 req.send();
 564         }
 565
 566 }
 567
 568 function advOneStep(xml) {
 569         var parsed = xml.getElementsByTagName("parsed")[0];
 570         var ambiguity = xml.getElementsByTagName("ambiguity")[0];
 571         var disamberr = xml.getElementsByTagName("disamberror")[0];
 572         if (is_defined(parsed)) {
 573         // debug("advance: received response\nBEGIN\n" + req.responseText + "\nEND");
 574             var len = parseInt(parsed.getAttribute("length"));
 575             // len0 = unlocked.innerHTML.length;
 576             var unescaped = unlocked.innerHTML.html_to_matita();
 577             var parsedtxt = parsed.childNodes[0].wholeText;
 578             //parsedtxt = unescaped.substr(0,len);
 579             var unparsedtxt = unescaped.substr(len);
 580             lockedbackup += parsedtxt;
 581             locked.innerHTML = lockedbackup;
 582             unlocked.innerHTML = unparsedtxt.matita_to_html();
 583             // len1 = unlocked.innerHTML.length;
 584             // len2 = len0 - len1;
 585             var len2 = parsedtxt.length;
 586             metasenv = xml.getElementsByTagName("meta");
 587             statements = listcons(len2,statements);
 588             unlocked.scrollIntoView(true);
 589             return len;
 590         }
 591         else if (is_defined(ambiguity)) {
 592             var start = parseInt(ambiguity.getAttribute("start"));
 593             var stop = parseInt(ambiguity.getAttribute("stop"));
 594             var choices = xml.getElementsByTagName("choice");
 595
 596             matita.ambiguityStart = start;
 597             matita.ambiguityStop = stop;
 598             matita.unlockedbackup = unlocked.innerHTML.html_to_matita();
 599             matita.interpretations = [];
 600
 601             var unlockedtxt = unlocked.innerHTML.html_to_matita();
 602             var pre = unlockedtxt.substring(0,start).matita_to_html();
 603             var mid = unlockedtxt.substring(start,stop).matita_to_html();
 604             var post = unlockedtxt.substring(stop).matita_to_html();
 605             unlocked.innerHTML = pre +
 606                     "<span class=\"error\" title=\"disambiguation error\">" +
 607                     mid + "</span>" + post;
 608
 609             var title = "<H3>Ambiguous input</H3>";
 610             disambcell.innerHTML = title;
 611             for (i = 0;i < choices.length;i++) {
 612                 matita.interpretations[i] = new Object();
 613
 614                 var href = choices[i].getAttribute("href");
 615                 var title = choices[i].getAttribute("title");
 616                 var desc = choices[i].childNodes[0].nodeValue;
 617
 618                 matita.interpretations[i].href = href;
 619                 matita.interpretations[i].title = title;
 620                 matita.interpretations[i].desc = desc;
 621
 622                 var choice = document.createElement("input");
 623                 choice.setAttribute("type","radio");
 624                 choice.setAttribute("name","interpr");
 625                 choice.setAttribute("href",href);
 626                 choice.setAttribute("title",title);
 627                 if (i == 0) choice.setAttribute("checked","");
 628
 629                 disambcell.appendChild(choice);
 630                 disambcell.appendChild(document.createTextNode(desc));
 631                 disambcell.appendChild(document.createElement("br"));
 632             }
 633
 634             var okbutton = document.createElement("input");
 635             okbutton.setAttribute("type","button");
 636             okbutton.setAttribute("value","OK");
 637             okbutton.setAttribute("onclick","do_disambiguate()");
 638             var cancelbutton = document.createElement("input");
 639             cancelbutton.setAttribute("type","button");
 640             cancelbutton.setAttribute("value","Cancel");
 641             cancelbutton.setAttribute("onclick","cancel_disambiguate()");
 642
 643             disambcell.appendChild(okbutton);
 644             disambcell.appendChild(cancelbutton);
 645
 646             matita.disambMode = true;
 647             updateSide();
 648             throw "Stop";
 649         }
 650         else if (is_defined(disamberr)) {
 651             // must be fixed in a daemon: it makes sense to return a
 652             // disambiguation error with no choices
 653             if (disamberr.childNodes.length > 0) {
 654               set_cps(disamberr.childNodes);
 655               matita.unlockedbackup = unlocked.innerHTML.html_to_matita();
 656               matita.disambMode = true;
 657               next_cp(0);
 658             }
 659             throw "Stop";
 660         }
 661         else {
 662             var error = xml.getElementsByTagName("error")[0];
 663             unlocked.innerHTML = error.childNodes[0].wholeText;
 664             // debug(xml.childNodes[0].nodeValue);
 665             throw "Stop";
 666         }
 667
 668 }
 669
 670 function advanceForm1()
 671 {
 672         processor = function(xml) {
 673            try {
 674                 if (is_defined(xml)) {
 675                     advOneStep(xml);
 676                     populate_goalarray(metasenv);
 677                     init_autotraces();
 678                 } else {
 679                         debug("advance failed");
 680                 }
 681             } catch (e) {
 682                     // nothing to do
 683             };
 684             resume();
 685         };
 686         pause();
 687         callServer("advance",processor,"body=" + (unlocked.innerHTML.html_to_matita()).sescape());
 688
 689 }
 690
 691 // get or set <choicepoint>'s (in case of disamb error)
 692 function get_cps() {
 693         return matita.choicepoints
 694 }
 695
 696 function set_cps(cps) {
 697         matita.choicepoints = cps;
 698 }
 699
 700 // get radio buttons for <choice>'s in a given cp
 701 function get_choice_opts(i) {
 702    var res = [];
 703    var choices = get_cps()[i].childNodes;
 704    for (var j = 0;j < choices.length;j++) {
 705       var href = choices[j].getAttribute("href");
 706       var title = choices[j].getAttribute("title");
 707       var desc;
 708       if (is_defined(title) && title != null) {
 709            desc = title;
 710       } else if (is_defined(href) && href != null) {
 711            desc = href;
 712       } else {
 713            desc = null;
 714       }
 715
 716       res[j] = document.createElement("input");
 717       res[j].setAttribute("type","radio");
 718       res[j].setAttribute("name","choice");
 719       res[j].setAttribute("choicepointno",i);
 720       res[j].setAttribute("choiceno",j);
 721       res[j].setAttribute("href",href);
 722       res[j].setAttribute("title",title);
 723       if (desc != null) res[j].setAttribute("desc",desc);
 724
 725       if (j == 0) res[j].setAttribute("checked","");
 726   }
 727   return res;
 728 }
 729
 730 // get radio buttons for <failure>'s in a given choice
 731 function get_failure_opts(i,j) {
 732    var res = [];
 733    var failures = get_cps()[i].childNodes[j].childNodes;
 734    for (var k = 0;k < failures.length;k++) {
 735       var start = failures[k].getAttribute("start");
 736       var stop = failures[k].getAttribute("stop");
 737       var title = failures[k].getAttribute("title");
 738
 739       res[k] = document.createElement("input");
 740       res[k].setAttribute("type","radio");
 741       res[k].setAttribute("name","failure");
 742       res[k].setAttribute("choicepointno",i);
 743       res[k].setAttribute("choiceno",j);
 744       res[k].setAttribute("failureno",k);
 745       res[k].setAttribute("start",start);
 746       res[k].setAttribute("stop",stop);
 747       res[k].setAttribute("title",title);
 748
 749       if (k == 0) res[k].setAttribute("checked","");
 750   }
 751   return res;
 752 }
 753
 754 function next_cp(curcp) {
 755         var cp = get_cps()[curcp];
 756         var start = parseInt(cp.getAttribute("start"));
 757         var stop = parseInt(cp.getAttribute("stop"));
 758
 759         matita.errorStart = start;
 760         matita.errorStop = stop;
 761         // matita.unlockedbackup = unlocked.innerHTML.html_to_matita();
 762
 763         var unlockedtxt = matita.unlockedbackup;
 764         var pre = unlockedtxt.substring(0,start).matita_to_html();
 765         var mid = unlockedtxt.substring(start,stop).matita_to_html();
 766         var post = unlockedtxt.substring(stop).matita_to_html();
 767         unlocked.innerHTML = pre +
 768                 "<span class=\"error\" title=\"error location\">" +
 769                 mid + "</span>" + post;
 770
 771         var title = "<H3>Error diagnostics</H3>";
 772         disambcell.innerHTML = title;
 773         var choices = get_choice_opts(curcp);
 774         for (var i = 0;i < choices.length;i++) {
 775             disambcell.appendChild(choices[i]);
 776             var desc = choices[i].getAttribute("desc");
 777             if (!is_defined(desc) || desc == null) {
 778                     desc = "Interpretation " + i;
 779             }
 780             disambcell.appendChild(document.createTextNode(desc));
 781             disambcell.appendChild(document.createElement("br"));
 782         }
 783
 784         // update index of the next choicepoint
 785         new_curcp = (curcp + 1) % get_cps().length;
 786
 787         var okbutton = document.createElement("input");
 788         okbutton.setAttribute("type","button");
 789         okbutton.setAttribute("value","OK");
 790         okbutton.setAttribute("onclick","show_failures()");
 791         var cancelbutton = document.createElement("input");
 792         cancelbutton.setAttribute("type","button");
 793         cancelbutton.setAttribute("value","Close");
 794         cancelbutton.setAttribute("onclick","cancel_disambiguate()");
 795         var tryagainbutton = document.createElement("input");
 796         tryagainbutton.setAttribute("type","button");
 797         if (new_curcp > 0) {
 798             tryagainbutton.setAttribute("value","Try something else");
 799         } else {
 800             tryagainbutton.setAttribute("value","Restart");
 801         }
 802         tryagainbutton.setAttribute("onclick","next_cp(" + new_curcp + ")");
 803
 804         disambcell.appendChild(okbutton);
 805         disambcell.appendChild(tryagainbutton);
 806         disambcell.appendChild(cancelbutton);
 807
 808         //disable_toparea();
 809
 810         //matita.disambMode = true;
 811         updateSide();
 812
 813 }
 814
 815 function show_failures() {
 816
 817         var choice = document.getElementsByName("choice")[get_checked_index("choice")];
 818         var cpno = parseInt(choice.getAttribute("choicepointno"));
 819         var choiceno = parseInt(choice.getAttribute("choiceno"));
 820         var choicedesc = choice.getAttribute("desc");
 821
 822         var title = "<H3>Error diagnostics</H3>";
 823         var subtitle;
 824         if (is_defined(choicedesc) && choicedesc != null) {
 825                 subtitle  = "<p>Errors at node " + cpno + " = " + choicedesc + "</p>";
 826         } else {
 827                 subtitle = "<p>Global errors:</p>";
 828         }
 829
 830         disambcell.innerHTML = title + subtitle;
 831         var failures = get_failure_opts(cpno,choiceno);
 832         for (var i = 0;i < failures.length;i++) {
 833             disambcell.appendChild(failures[i]);
 834             disambcell.appendChild(document.createTextNode(failures[i].getAttribute("title")));
 835             disambcell.appendChild(document.createElement("br"));
 836         }
 837
 838         var okbutton = document.createElement("input");
 839         okbutton.setAttribute("type","button");
 840         okbutton.setAttribute("value","Show error loc");
 841         okbutton.setAttribute("onclick","show_err()");
 842         var cancelbutton = document.createElement("input");
 843         cancelbutton.setAttribute("type","button");
 844         cancelbutton.setAttribute("value","Close");
 845         cancelbutton.setAttribute("onclick","cancel_disambiguate()");
 846         var backbutton = document.createElement("input");
 847         backbutton.setAttribute("type","button");
 848         backbutton.setAttribute("value","<< Back");
 849         backbutton.setAttribute("onclick","next_cp(" + cpno + ")");
 850
 851         disambcell.appendChild(backbutton);
 852         disambcell.appendChild(okbutton);
 853         disambcell.appendChild(cancelbutton);
 854
 855 }
 856
 857 function show_err() {
 858         var radios = document.getElementsByName("failure");
 859         for (i = 0; i < radios.length; i++) {
 860             if (radios[i].checked) {
 861                 var start = radios[i].getAttribute("start");
 862                 var stop = radios[i].getAttribute("stop");
 863                 var title = radios[i].getAttribute("title");
 864                 var unlockedtxt = matita.unlockedbackup;
 865                 var pre = unlockedtxt.substring(0,start).matita_to_html();
 866                 var mid = unlockedtxt.substring(start,stop).matita_to_html();
 867                 var post = unlockedtxt.substring(stop).matita_to_html();
 868                 unlocked.innerHTML = pre +
 869                         "<span class=\"error\" title=\"Disambiguation failure\">" +
 870                         mid + "</span>" + post;
 871                 break;
 872             }
 873         }
 874 }
 875
 876 function gotoBottom()
 877 {
 878         processor = function(xml) {
 879                 if (is_defined(xml)) {
 880                         // debug("goto bottom: received response\nBEGIN\n" + req.responseText + "\nEND");
 881                         var parsed = xml.getElementsByTagName("parsed");
 882                         var localized = xml.getElementsByTagName("localized")[0];
 883                         var ambiguity = xml.getElementsByTagName("ambiguity")[0];
 884                         var generic_err = xml.getElementsByTagName("error")[0];
 885                         var disamberr = xml.getElementsByTagName("disamberror")[0];
 886                         for (var i = 0;i < parsed.length; i++) {
 887                           var len = parsed[i].getAttribute("length");
 888                           // len0 = unlocked.innerHTML.length;
 889                           var unescaped = unlocked.innerHTML.html_to_matita();
 890                           // the browser may decide to split textnodes: use wholeText!
 891                           var parsedtxt = parsed[i].childNodes[0].wholeText;
 892                           //parsedtxt = unescaped.substr(0,len);
 893                           var unparsedtxt = unescaped.substr(len);
 894                           lockedbackup += parsedtxt;
 895                           locked.innerHTML = lockedbackup; //.matita_to_html();
 896                           unlocked.innerHTML = unparsedtxt.matita_to_html();
 897                           // len1 = unlocked.innerHTML.length;
 898                           var len2 = parsedtxt.length;
 899                           statements = listcons(len2,statements);
 900                         }
 901                         unlocked.scrollIntoView(true);
 902                         metasenv = xml.getElementsByTagName("meta");
 903                         init_autotraces();
 904                         populate_goalarray(metasenv);
 905
 906                         if (is_defined(ambiguity)) {
 907                             var start = parseInt(ambiguity.getAttribute("start"));
 908                             var stop = parseInt(ambiguity.getAttribute("stop"));
 909                             var choices = xml.getElementsByTagName("choice");
 910
 911                             matita.ambiguityStart = start;
 912                             matita.ambiguityStop = stop;
 913                             matita.unlockedbackup = unlocked.innerHTML.html_to_matita();
 914                             matita.interpretations = [];
 915
 916                             var unlockedtxt = unlocked.innerHTML.html_to_matita();
 917                             var pre = unlockedtxt.substring(0,start).matita_to_html();
 918                             var mid = unlockedtxt.substring(start,stop).matita_to_html();
 919                             var post = unlockedtxt.substring(stop).matita_to_html();
 920                             unlocked.innerHTML = pre +
 921                                     "<span class=\"error\" title=\"disambiguation error\">" +
 922                                     mid + "</span>" + post;
 923
 924                             var title = "<H3>Ambiguous input</H3>";
 925                             disambcell.innerHTML = title;
 926                             for (i = 0;i < choices.length;i++) {
 927                                 matita.interpretations[i] = new Object();
 928
 929                                 var href = choices[i].getAttribute("href");
 930                                 var title = choices[i].getAttribute("title");
 931                                 var desc = choices[i].childNodes[0].nodeValue;
 932
 933                                 matita.interpretations[i].href = href;
 934                                 matita.interpretations[i].title = title;
 935                                 matita.interpretations[i].desc = desc;
 936
 937                                 var choice = document.createElement("input");
 938                                 choice.setAttribute("type","radio");
 939                                 choice.setAttribute("name","interpr");
 940                                 choice.setAttribute("href",href);
 941                                 choice.setAttribute("title",title);
 942                                 if (i == 0) choice.setAttribute("checked","");
 943
 944                                 disambcell.appendChild(choice);
 945                                 disambcell.appendChild(document.createTextNode(desc));
 946                                 disambcell.appendChild(document.createElement("br"));
 947                             }
 948
 949                             var okbutton = document.createElement("input");
 950                             okbutton.setAttribute("type","button");
 951                             okbutton.setAttribute("value","OK");
 952                             okbutton.setAttribute("onclick","do_disambiguate()");
 953                             var cancelbutton = document.createElement("input");
 954                             cancelbutton.setAttribute("type","button");
 955                             cancelbutton.setAttribute("value","Cancel");
 956                             cancelbutton.setAttribute("onclick","cancel_disambiguate()");
 957
 958                             disambcell.appendChild(okbutton);
 959                             disambcell.appendChild(cancelbutton);
 960
 961                             matita.disambMode = true;
 962                             updateSide();
 963                         }
 964                         else if (is_defined(disamberr)) {
 965                             // must be fixed in a daemon: it makes sense to return a
 966                             // disambiguation error with no choices
 967                             if (disamberr.childNodes.length > 0) {
 968                               set_cps(disamberr.childNodes);
 969                               matita.unlockedbackup = unlocked.innerHTML.html_to_matita();
 970                               matita.disambMode = true;
 971                               next_cp(0);
 972                             }
 973                             throw "Stop";
 974                         }
 975                         else if (is_defined(localized)) {
 976                             unlocked.innerHTML = localized.childNodes[0].wholeText;
 977                         }
 978                         else if (is_defined(generic_err)) {
 979                             debug("Unmanaged error:\n" ^ generic_err.childNodes[0].wholeText);
 980                         }
 981                 } else {
 982                         debug("goto bottom failed");
 983                 }
 984                 resume();
 985         };
 986         pause();
 987         callServer("bottom",processor,"body=" + (unlocked.innerHTML.html_to_matita()).sescape());
 988 }
 989
 990
 991 function gotoTop()
 992 {
 993         processor = function(xml) {
 994                 if (is_defined(xml)) {
 995                   if (xml.childNodes[0].textContent != "ok") {
 996                      debug("goto top failed");
 997                   }
 998                   else
 999                         statements = listnil();
1000                         /*
1001                         lockedlen = locked.innerHTML.length - statementlen;
1002                         statement = locked.innerHTML.substr(lockedlen, statementlen);
1003                         locked.innerHTML = locked.innerHTML.substr(0,lockedlen);
1004                         unlocked.innerHTML = statement + unlocked.innerHTML;
1005                         */
1006                         unlocked.innerHTML = lockedbackup + unlocked.innerHTML;
1007                         lockedbackup = "";
1008                         locked.innerHTML = lockedbackup;
1009                         init_autotraces();
1010                         hideSequent();
1011                         unlocked.scrollIntoView(true);
1012                 } else {
1013                         debug("goto top failed");
1014                 }
1015                 resume();
1016         };
1017         pause();
1018         callServer("top",processor,"body=" + (unlocked.innerHTML.html_to_matita()).sescape());
1019
1020 }
1021
1022 function gotoPos(offset)
1023 {
1024         if (!is_defined(offset)) {
1025                 offset = getCursorPos();
1026         }
1027         processor = function(xml) {
1028                 if (is_defined(xml)) {
1029                     try {
1030                         /*
1031                         parsed = xml.getElementsByTagName("parsed")[0];
1032                         len = parseInt(parsed.getAttribute("length"));
1033                         // len0 = unlocked.innerHTML.length;
1034                         unescaped = unlocked.innerHTML.html_to_matita();
1035                         parsedtxt = parsed.childNodes[0].wholeText;
1036                         //parsedtxt = unescaped.substr(0,len);
1037                         unparsedtxt = unescaped.substr(len);
1038                         lockedbackup += parsedtxt;
1039                         locked.innerHTML = lockedbackup; //.matita_to_html();
1040                         unlocked.innerHTML = unparsedtxt.matita_to_html();
1041                         // len1 = unlocked.innerHTML.length;
1042                         len2 = parsedtxt.length;
1043                         metasenv = xml.getElementsByTagName("meta");
1044                         // populate_goalarray(metasenv);
1045                         statements = listcons(len2,statements);
1046                         unlocked.scrollIntoView(true);
1047                         // la populate non andrebbe fatta a ogni passo
1048                         */
1049                         var len = advOneStep(xml);
1050                         if (offset <= len) {
1051                                 init_autotraces();
1052                                 populate_goalarray(metasenv);
1053                                 resume();
1054                         } else {
1055                                 gotoPos(offset - len);
1056                         }
1057                     } catch (er) {
1058                         init_autotraces();
1059                         populate_goalarray(metasenv);
1060                         resume();
1061                     }
1062                 } else {
1063                         init_autotraces();
1064                         unlocked.scrollIntoView(true);
1065                         populate_goalarray(metasenv);
1066                         resume();
1067                 }
1068         }
1069         pause();
1070         callServer("advance",processor,"body=" + (unlocked.innerHTML.html_to_matita()).sescape());
1071 }
1072
1073 function retract()
1074 {
1075         processor = function(xml) {
1076                 if (typeof xml != "undefined") {
1077                         // debug("advance: received response\nBEGIN\n" + req.responseText + "\nEND");
1078                         statementlen = parseInt(listhd(statements));
1079                         statements = listtl(statements);
1080                         /*
1081                         lockedlen = locked.innerHTML.length - statementlen;
1082                         statement = locked.innerHTML.substr(lockedlen, statementlen);
1083                         locked.innerHTML = locked.innerHTML.substr(0,lockedlen);
1084                         unlocked.innerHTML = statement + unlocked.innerHTML;
1085                         */
1086                         lockedlen = lockedbackup.length - statementlen;
1087                         statement = lockedbackup.substr(lockedlen, statementlen);
1088                         lockedbackup = lockedbackup.substr(0,lockedlen);
1089                         locked.innerHTML = lockedbackup;
1090                         unlocked.innerHTML = statement + unlocked.innerHTML;
1091                         metasenv = xml.getElementsByTagName("meta");
1092                         init_autotraces();
1093                         populate_goalarray(metasenv);
1094                         unlocked.scrollIntoView(true);
1095                 } else {
1096                         debug("retract failed");
1097                 }
1098                 resume();
1099         };
1100         pause();
1101         callServer("retract",processor);
1102 }
1103
1104 function openFile()
1105 {
1106         processor = function(xml)
1107         {
1108                 if (is_defined(xml)) {
1109                         lockedbackup = "";
1110                         locked.innerHTML = lockedbackup;
1111                         unlocked.innerHTML = xml.documentElement.wholeText;
1112                 } else {
1113                         debug("file open failed");
1114                 }
1115         };
1116         callServer("open",processor,"file=" + escape(filename.value));
1117 }
1118
1119 function retrieveFile(thefile)
1120 {
1121         processor = function(xml)
1122         {
1123                 if (is_defined(xml)) {
1124                         changeFile(thefile);
1125                         matita.disambMode = false;
1126                         matita.proofMode = false;
1127                         updateSide();
1128                         lockedbackup = ""
1129                         locked.innerHTML = lockedbackup;
1130                         // code originally used in google chrome (problems with mozilla)
1131                         // debug(xml.getElementsByTagName("file")[0].childNodes[0].nodeValue);
1132                         // unlocked.innerHTML = xml.getElementsByTagName("file")[0].childNodes[0].nodeValue;
1133                         debug(xml.childNodes[0].textContent);
1134                         if (document.all) { // IE
1135                           unlocked.innerHTML = xml.childNodes[0].text;
1136                         } else {
1137                           unlocked.innerHTML = xml.childNodes[0].textContent;
1138                         }
1139                         init_autotraces();
1140
1141                 } else {
1142                         debug("file open failed");
1143                 }
1144         };
1145         abortDialog("dialogBox");
1146         callServer("open",processor,"file=" + escape(thefile));
1147 }
1148
1149 function showLibrary(title,callback,reloadDialog)
1150 {
1151         var req = null;
1152         dialogBox.reload = reloadDialog;
1153         // pause();
1154         if (window.XMLHttpRequest)
1155         {
1156                 req = new XMLHttpRequest();
1157         }
1158         else if (window.ActiveXObject)
1159         {
1160                 try {
1161                                 req = new ActiveXObject("Msxml2.XMLHTTP");
1162                 } catch (e)
1163                 {
1164                         try {
1165                                 req = new ActiveXObject("Microsoft.XMLHTTP");
1166                                 } catch (e) {}
1167                 }
1168         }
1169         req.onreadystatechange = function()
1170         {
1171
1172                 rs = req.readyState;
1173
1174                 if(rs == 4)
1175                 {
1176                         stat = req.status;
1177                         stxt = req.statusText;
1178                         if(stat == 200)
1179                         {
1180                           debug(req.responseText);
1181                           showDialog("<H2>" + title + "</H2>",req.responseText, callback);
1182                         }
1183                 }
1184         };
1185         req.open("POST", "viewlib"); // + escape(unlocked.innerHTML), true);
1186         req.setRequestHeader("Content-type","application/x-www-form-urlencoded");
1187         req.send();
1188
1189 }
1190
1191 function uploadDialog()
1192 {
1193         uploadBox.style.display = "block";
1194 }
1195
1196 function uploadOK()
1197 {
1198    var file = document.getElementById("uploadFilename").files[0];
1199 //   if (file) {
1200 //       var filecontent = file.getAsText("UTF-8");
1201 //       locked.innerHTML = lockedbackup;
1202 //       unlocked.innerHTML = filecontent;
1203 //       uploadBox.style.display = "none";
1204 //   }
1205    if (file) {
1206       var reader = new FileReader();
1207       reader.onerror = function (evt) {
1208            debug("file open failed");
1209       }
1210       reader.onload = function (evt) {
1211            lockedbackup = "";
1212            locked.innerHTML = lockedbackup
1213            unlocked.innerHTML = "";
1214            unlocked.appendChild(document.createTextNode(evt.target.result));
1215            uploadBox.style.display = "none";
1216       }
1217       try { reader.readAsText(file, "UTF-8"); }
1218       catch (err) { /* nothing to do */ };
1219       uploadBox.style.display = "none";
1220    }
1221 }
1222
1223 function openDialog()
1224 {
1225         callback = function (fname) { retrieveFile(fname); };
1226         showLibrary("Open file", callback, openDialog);
1227 }
1228
1229 function saveDialog()
1230 {
1231         callback = function (fname) {
1232           abortDialog("dialogBox");
1233           saveFile(fname,
1234                    (locked.innerHTML.html_to_matita()).sescape(),
1235                    (unlocked.innerHTML.html_to_matita()).sescape(),
1236                    false,saveDialog);
1237         };
1238         showLibrary("Save file as", callback, saveDialog);
1239 }
1240
1241 function newDialog()
1242 {
1243         callback = function (fname) {
1244           abortDialog("dialogBox");
1245           saveFile(fname,"","",false,newDialog,true);
1246         };
1247         showLibrary("Create new file", callback, newDialog);
1248 }
1249
1250
1251 function saveFile(fname,lockedtxt,unlockedtxt,force,reloadDialog,reloadFile)
1252 {
1253         if (!is_defined(reloadFile)) { reloadFile = true };
1254         if (!is_defined(fname)) {
1255             fname = current_fname;
1256             lockedtxt = (locked.innerHTML.html_to_matita()).sescape();
1257             unlockedtxt = (unlocked.innerHTML.html_to_matita()).sescape();
1258             force = true;
1259             // when force is true, reloadDialog is not needed
1260         }
1261         processor = function(xml) {
1262                 if (is_defined(xml)) {
1263                   if (xml.childNodes[0].textContent != "ok") {
1264                     if (confirm("File already exists. All existing data will be lost.\nDo you want to proceed anyway?")) {
1265                        saveFile(fname,lockedtxt,unlockedtxt,true,reloadDialog,reloadFile);
1266                     } else {
1267                       reloadDialog();
1268                     }
1269                   } else {
1270                     changeFile(fname);
1271                     debug("file saved!");
1272                     if (reloadFile) { retrieveFile(fname); }
1273                   }
1274                 } else {
1275                         debug("save file failed");
1276                 }
1277                 resume();
1278         };
1279         if (is_defined(fname)) {
1280           pause();
1281           callServer("save",processor,"file=" + escape(fname) +
1282                                     "&locked=" + lockedtxt +
1283                                     "&unlocked=" + unlockedtxt +
1284                                     "&force=" + force);
1285         }
1286         else { debug("no file selected"); }
1287 }
1288
1289 function createDir() {
1290    abortDialog("dialogBox");
1291    dirname = prompt("New directory name:\ncic:/matita/","newdir");
1292    if (dirname != null) {
1293         processor = function(xml) {
1294                 if (is_defined(xml)) {
1295                   if (xml.childNodes[0].textContent != "ok") {
1296                       alert("An error occurred :-(");
1297                   }
1298                 } else {
1299                       alert("An error occurred :-(");
1300                 }
1301                 dialogBox.reload();
1302         };
1303         pause();
1304         callServer("save",processor,"file=" + escape(dirname) +
1305                                     "&locked=&unlocked=&force=false&dir=true");
1306    } else {
1307       dialogBox.reload();
1308    }
1309 }
1310
1311 function commitAll()
1312 {
1313         processor = function(xml) {
1314                 if (is_defined(xml)) {
1315                         debug(xml.getElementsByTagName("details")[0].textContent);
1316                         alert("Commit executed: see details in the log.\n\n" +
1317                               "NOTICE: this message does NOT imply (yet) that the commit was successful.");
1318                 } else {
1319                         alert("Commit failed!");
1320                 }
1321                 resume();
1322         };
1323         pause();
1324         callServer("commit",processor);
1325 }
1326
1327 function updateAll()
1328 {
1329         processor = function(xml) {
1330                 if (is_defined(xml)) {
1331                         alert("Update executed.\n\n" +
1332                               "Details:\n" +
1333                               xml.getElementsByTagName("details")[0].textContent);
1334                 } else {
1335                         alert("Update failed!");
1336                 }
1337                 resume();
1338         };
1339         pause();
1340         callServer("update",processor);
1341 }
1342
1343 var goalcell;
1344
1345 function hideSequent() {
1346         matita.proofMode = false;
1347         updateSide();
1348 }
1349
1350 function showSequent() {
1351         matita.proofMode = true;
1352         updateSide();
1353 }
1354
1355 function showDialog(title,content,callback) {
1356   dialogTitle.innerHTML = title;
1357   dialogContent.innerHTML = content;
1358   dialogBox.callback = callback;
1359
1360   //Get the screen height and width
1361   var maskHeight = $(document).height();
1362   var maskWidth = $(window).width();
1363
1364   //Set heigth and width to mask to fill up the whole screen
1365   $('#mask').css({'width':maskWidth,'height':maskHeight});
1366
1367   //transition effect
1368   $('#mask').fadeIn(100);
1369   $('#mask').fadeTo(200,0.8);
1370
1371   //Get the window height and width
1372   var winH = $(window).height();
1373   var winW = $(window).width();
1374
1375   //Set the popup window to center
1376   $('#dialogBox').css('top',  winH/2-$('#dialogBox').height()/2);
1377   $('#dialogBox').css('left', winW/2-$('#dialogBox').width()/2);
1378
1379   //transition effect
1380   $('#dialogBox').fadeIn(200);
1381
1382   dialogBox.style.display = "block";
1383 }
1384
1385 function abortDialog(dialog) {
1386   document.getElementById(dialog).style.display = "none";
1387   $('#mask').hide();
1388 }
1389
1390 function removeElement(id) {
1391   var element = document.getElementById(id);
1392   element.parentNode.removeChild(element);
1393 }
1394
1395 var savedsc;
1396 var savedso;
1397
1398 function getCursorPos() {
1399   var cursorPos;
1400   if (window.getSelection) {
1401     var selObj = window.getSelection();
1402     savedRange = selObj.getRangeAt(0);
1403     savedsc = savedRange.startContainer;
1404     savedso = savedRange.startOffset;
1405     //cursorPos =  findNode(selObj.anchorNode.parentNode.childNodes, selObj.anchorNode) + selObj.anchorOffset;
1406     cursorPos =  findNode(unlocked.childNodes, selObj.anchorNode,0) + selObj.anchorOffset;
1407     /* FIXME the following works wrong in Opera when the document is longer than 32767 chars */
1408     return(cursorPos);
1409   }
1410   else if (document.selection) {
1411     savedRange = document.selection.createRange();
1412     var bookmark = savedRange.getBookmark();
1413     /* FIXME the following works wrong when the document is longer than 65535 chars */
1414     cursorPos = bookmark.charCodeAt(2) - 11; /* Undocumented function [3] */
1415     return(cursorPos);
1416   }
1417 }
1418
1419 function findNode(list, node, acc) {
1420   for (var i = 0; i < list.length; i++) {
1421     if (list[i] == node) {
1422    //   debug("success " + i);
1423       return acc;
1424     }
1425     if (list[i].hasChildNodes()) {
1426        try {
1427    //      debug("recursion on node " + i);
1428          return (findNode(list[i].childNodes,node,acc))
1429        }
1430        catch (e) { /* debug("recursion failed"); */ }
1431     }
1432     sandbox = document.getElementById("sandbox");
1433     dup = list[i].cloneNode(true);
1434     sandbox.appendChild(dup);
1435 //    debug("fail " + i + ": " + sandbox.innerHTML);
1436     acc += sandbox.innerHTML.html_to_matita().length;
1437     sandbox.removeChild(dup);
1438   }
1439   throw "not found";
1440 }
1441
1442 function test () {
1443   debug("cursor test: " + unlocked.innerHTML.substr(0,getCursorPos()));
1444 }
1445
1446 function get_checked_index(name) {
1447         var radios = document.getElementsByName(name);
1448         for (i = 0; i < radios.length; i++) {
1449             if (radios[i].checked) {
1450                     return i;
1451             }
1452         }
1453         return null;
1454 }
1455
1456 function cancel_disambiguate() {
1457         matita.disambMode = false;
1458         resume();
1459         // enable_toparea();
1460         // enable_editing();
1461         strip_tags("span","error");
1462         updateSide();
1463 }
1464
1465 function do_disambiguate() {
1466         var i = get_checked_index("interpr");
1467         if (i != null) {
1468             var pre = matita.unlockedbackup
1469                       .substring(0,matita.ambiguityStart).matita_to_html();
1470             var mid = matita.unlockedbackup
1471                       .substring(matita.ambiguityStart,matita.ambiguityStop)
1472                       .matita_to_html();
1473             var post = matita.unlockedbackup
1474                        .substring(matita.ambiguityStop).matita_to_html();
1475
1476             var href = matita.interpretations[i].href;
1477             var title = matita.interpretations[i].title;
1478
1479             if (is_defined(title)) {
1480                 mid = "<A href=\"" + href + "\" title=\"" + title + "\">" + mid + "</A>";
1481             } else {
1482                 mid = "<A href=\"" + href + "\">" + mid + "</A>";
1483             }
1484
1485             unlocked.innerHTML = pre + mid + post;
1486
1487             matita.disambMode = false;
1488             enable_toparea();
1489             enable_editing();
1490             updateSide();
1491         }
1492 }
1493
1494 function do_showerror() {
1495         var i = get_checked_index("choice");
1496         if (i != null) {
1497             var pre = matita.unlockedbackup
1498                       .substring(0,matita.ambiguityStart).matita_to_html();
1499             var mid = matita.unlockedbackup
1500                       .substring(matita.ambiguityStart,matita.ambiguityStop)
1501                       .matita_to_html();
1502             var post = matita.unlockedbackup
1503                        .substring(matita.ambiguityStop).matita_to_html();
1504
1505             var href = matita.interpretations[i].href;
1506             var title = matita.interpretations[i].title;
1507
1508             if (is_defined(title)) {
1509                 mid = "<A href=\"" + href + "\" title=\"" + title + "\">" + mid + "</A>";
1510             } else {
1511                 mid = "<A href=\"" + href + "\">" + mid + "</A>";
1512             }
1513
1514             unlocked.innerHTML = pre + mid + post;
1515
1516         }
1517 }
1518
1519 function readCookie(name) {
1520         var nameEQ = name + "=";
1521         var ca = document.cookie.split(';');
1522         for(var i=0;i < ca.length;i++) {
1523                 var c = ca[i];
1524                 while (c.charAt(0)==' ') c = c.substring(1,c.length);
1525                 if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
1526         }
1527         return null;
1528 }
1529
1530 function delete_cookie ( cookie_name )
1531 {
1532   var cookie_date = new Date();  // current date & time
1533   cookie_date.setTime ( cookie_date.getTime() - 1 );
1534   document.cookie = cookie_name += "=; expires=" + cookie_date.toGMTString();
1535 }
1536
1537 function delete_session()
1538 {
1539         delete_cookie("session");
1540 }
1541
1542 function disable_toparea() {
1543         var offset = $('#toparea').offset();
1544         $('#whitemask').css('top',offset.top);
1545         $('#whitemask').css('left',offset.left);
1546         $('#whitemask').css('width',$('#toparea').outerWidth() + "px");
1547         $('#whitemask').css('height',$('#toparea').outerHeight() + "px");
1548         $('#whitemask').fadeTo('fast',0.7);
1549 }
1550
1551 function enable_toparea() {
1552         $('#whitemask').hide();
1553 }
1554
1555 function disable_editing() {
1556         unlocked.contentEditable = false;
1557 }
1558
1559 function enable_editing() {
1560         unlocked.contentEditable = true;
1561 }
1562
1563 function pause()
1564 {
1565         // advanceButton.disabled = true;
1566         // retractButton.disabled = true;
1567         // cursorButton.disabled = true;
1568         // bottomButton.disabled = true;
1569         disable_toparea();
1570         disable_editing();
1571 }
1572
1573 function resume()
1574 {
1575         // advanceButton.disabled = false;
1576         // retractButton.disabled = false;
1577         // cursorButton.disabled = false;
1578         // bottomButton.disabled = false;
1579         if (!matita.disambMode) {
1580                 enable_toparea();
1581                 enable_editing();
1582         }
1583 }
1584