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 is_defined(x)
 501 {
 502         return (typeof x != "undefined");
 503 }
 504
 505 /* servicename: name of the service being called
 506  * reqbody: text of the request
 507  * processResponse: processes the server response
 508  *     (takes the response text in input, undefined in case of error)
 509  */
 510 function callServer(servicename,processResponse,reqbody)
 511 {
 512         var req = null;
 513         // pause();
 514         if (window.XMLHttpRequest)
 515         {
 516                 req = new XMLHttpRequest();
 517         }
 518         else if (window.ActiveXObject)
 519         {
 520                 try {
 521                                 req = new ActiveXObject("Msxml2.XMLHTTP");
 522                 } catch (e)
 523                 {
 524                         try {
 525                                 req = new ActiveXObject("Microsoft.XMLHTTP");
 526                                 } catch (e) {}
 527                 }
 528         }
 529         req.onreadystatechange = function()
 530         {
 531
 532                 rs = req.readyState;
 533
 534                 if(rs == 4)
 535                 {
 536                         stat = req.status;
 537                         stxt = req.statusText;
 538                         if(stat == 200)
 539                         {
 540                           debug(req.responseText);
 541                           if (window.DOMParser) {
 542                             parser=new DOMParser();
 543                             xmlDoc=parser.parseFromString(req.responseText,"text/xml");
 544                           }
 545                           else // Internet Explorer
 546                           {
 547                             xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
 548                             xmlDoc.async="false";
 549                             xmlDoc.loadXML(req.responseText);
 550                           }
 551                           processResponse(xmlDoc);
 552                         } else {
 553                           processResponse();
 554                         }
 555                 }
 556         };
 557         req.open("POST", servicename); // + escape(unlocked.innerHTML), true);
 558         req.setRequestHeader("Content-type","application/x-www-form-urlencoded");
 559         if (reqbody) {
 560                 req.send(reqbody);
 561         } else {
 562                 req.send();
 563         }
 564
 565 }
 566
 567 function advOneStep(xml) {
 568         var parsed = xml.getElementsByTagName("parsed")[0];
 569         var ambiguity = xml.getElementsByTagName("ambiguity")[0];
 570         var disamberr = xml.getElementsByTagName("disamberror")[0];
 571         if (is_defined(parsed)) {
 572         // debug("advance: received response\nBEGIN\n" + req.responseText + "\nEND");
 573             var len = parseInt(parsed.getAttribute("length"));
 574             // len0 = unlocked.innerHTML.length;
 575             var unescaped = unlocked.innerHTML.html_to_matita();
 576             var parsedtxt = parsed.childNodes[0].wholeText;
 577             //parsedtxt = unescaped.substr(0,len);
 578             var unparsedtxt = unescaped.substr(len);
 579             lockedbackup += parsedtxt;
 580             locked.innerHTML = lockedbackup;
 581             unlocked.innerHTML = unparsedtxt.matita_to_html();
 582             // len1 = unlocked.innerHTML.length;
 583             // len2 = len0 - len1;
 584             var len2 = parsedtxt.length;
 585             var metasenv = xml.getElementsByTagName("meta");
 586             statements = listcons(len2,statements);
 587             unlocked.scrollIntoView(true);
 588             return len;
 589         }
 590         else if (is_defined(ambiguity)) {
 591             var start = parseInt(ambiguity.getAttribute("start"));
 592             var stop = parseInt(ambiguity.getAttribute("stop"));
 593             var choices = xml.getElementsByTagName("choice");
 594
 595             matita.ambiguityStart = start;
 596             matita.ambiguityStop = stop;
 597             matita.unlockedbackup = unlocked.innerHTML.html_to_matita();
 598             matita.interpretations = [];
 599
 600             var unlockedtxt = unlocked.innerHTML.html_to_matita();
 601             var pre = unlockedtxt.substring(0,start).matita_to_html();
 602             var mid = unlockedtxt.substring(start,stop).matita_to_html();
 603             var post = unlockedtxt.substring(stop).matita_to_html();
 604             unlocked.innerHTML = pre +
 605                     "<span class=\"error\" title=\"disambiguation error\">" +
 606                     mid + "</span>" + post;
 607
 608             var title = "<H3>Ambiguous input</H3>";
 609             disambcell.innerHTML = title;
 610             for (i = 0;i < choices.length;i++) {
 611                 matita.interpretations[i] = new Object();
 612
 613                 var href = choices[i].getAttribute("href");
 614                 var title = choices[i].getAttribute("title");
 615                 var desc = choices[i].childNodes[0].nodeValue;
 616
 617                 matita.interpretations[i].href = href;
 618                 matita.interpretations[i].title = title;
 619                 matita.interpretations[i].desc = desc;
 620
 621                 var choice = document.createElement("input");
 622                 choice.setAttribute("type","radio");
 623                 choice.setAttribute("name","interpr");
 624                 choice.setAttribute("href",href);
 625                 choice.setAttribute("title",title);
 626                 if (i == 0) choice.setAttribute("checked","");
 627
 628                 disambcell.appendChild(choice);
 629                 disambcell.appendChild(document.createTextNode(desc));
 630                 disambcell.appendChild(document.createElement("br"));
 631             }
 632
 633             var okbutton = document.createElement("input");
 634             okbutton.setAttribute("type","button");
 635             okbutton.setAttribute("value","OK");
 636             okbutton.setAttribute("onclick","do_disambiguate()");
 637             var cancelbutton = document.createElement("input");
 638             cancelbutton.setAttribute("type","button");
 639             cancelbutton.setAttribute("value","Cancel");
 640             cancelbutton.setAttribute("onclick","cancel_disambiguate()");
 641
 642             disambcell.appendChild(okbutton);
 643             disambcell.appendChild(cancelbutton);
 644
 645             disable_toparea();
 646
 647             matita.disambMode = true;
 648             updateSide();
 649             throw "Stop";
 650         }
 651         else if (is_defined(disamberr)) {
 652             set_cps(disamberr.childNodes);
 653             matita.unlockedbackup = unlocked.innerHTML.html_to_matita();
 654             matita.disambMode = true;
 655             disable_toparea();
 656             next_cp(0);
 657             throw "Stop";
 658         }
 659         else {
 660             var error = xml.getElementsByTagName("error")[0];
 661             unlocked.innerHTML = error.childNodes[0].wholeText;
 662             // debug(xml.childNodes[0].nodeValue);
 663             throw "Stop";
 664         }
 665
 666 }
 667
 668 function advanceForm1()
 669 {
 670         processor = function(xml) {
 671            try {
 672                 if (is_defined(xml)) {
 673                     advOneStep(xml);
 674                     populate_goalarray(metasenv);
 675                     init_autotraces();
 676                 } else {
 677                         debug("advance failed");
 678                 }
 679             } catch (e) {
 680                     // nothing to do
 681             };
 682             resume();
 683         };
 684         pause();
 685         callServer("advance",processor,"body=" + (unlocked.innerHTML.html_to_matita()).sescape());
 686
 687 }
 688
 689 // get or set <choicepoint>'s (in case of disamb error)
 690 function get_cps() {
 691         return matita.choicepoints
 692 }
 693
 694 function set_cps(cps) {
 695         matita.choicepoints = cps;
 696 }
 697
 698 // get radio buttons for <choice>'s in a given cp
 699 function get_choice_opts(i) {
 700    var res = [];
 701    var choices = get_cps()[i].childNodes;
 702    for (var j = 0;j < choices.length;j++) {
 703       var href = choices[j].getAttribute("href");
 704       var title = choices[j].getAttribute("title");
 705       var desc;
 706       if (is_defined(title)) {
 707            desc = title;
 708       } else if (is_defined(href)) {
 709            desc = href;
 710       } else {
 711            desc = "Preliminary error";
 712       }
 713
 714       res[j] = document.createElement("input");
 715       res[j].setAttribute("type","radio");
 716       res[j].setAttribute("name","choice");
 717       res[j].setAttribute("choicepointno",i);
 718       res[j].setAttribute("choiceno",j);
 719       res[j].setAttribute("href",href);
 720       res[j].setAttribute("title",title);
 721       res[j].setAttribute("desc",desc);
 722
 723       if (j == 0) res[j].setAttribute("checked","");
 724   }
 725   return res;
 726 }
 727
 728 // get radio buttons for <failure>'s in a given choice
 729 function get_failure_opts(i,j) {
 730    var res = [];
 731    var failures = get_cps()[i].childNodes[j].childNodes;
 732    for (var k = 0;k < failures.length;k++) {
 733       var start = failures[k].getAttribute("start");
 734       var stop = failures[k].getAttribute("stop");
 735       var title = failures[k].getAttribute("title");
 736
 737       res[k] = document.createElement("input");
 738       res[k].setAttribute("type","radio");
 739       res[k].setAttribute("name","failure");
 740       res[k].setAttribute("choicepointno",i);
 741       res[k].setAttribute("choiceno",j);
 742       res[k].setAttribute("failureno",k);
 743       res[k].setAttribute("start",start);
 744       res[k].setAttribute("stop",stop);
 745       res[k].setAttribute("title",title);
 746
 747       if (k == 0) res[k].setAttribute("checked","");
 748   }
 749   return res;
 750 }
 751
 752 function next_cp(curcp) {
 753         var cp = get_cps()[curcp];
 754         var start = parseInt(cp.getAttribute("start"));
 755         var stop = parseInt(cp.getAttribute("stop"));
 756
 757         matita.errorStart = start;
 758         matita.errorStop = stop;
 759         // matita.unlockedbackup = unlocked.innerHTML.html_to_matita();
 760
 761         var unlockedtxt = matita.unlockedbackup;
 762         var pre = unlockedtxt.substring(0,start).matita_to_html();
 763         var mid = unlockedtxt.substring(start,stop).matita_to_html();
 764         var post = unlockedtxt.substring(stop).matita_to_html();
 765         unlocked.innerHTML = pre +
 766                 "<span class=\"error\" title=\"disambiguation failed\">" +
 767                 mid + "</span>" + post;
 768
 769         var title = "<H3>Disambiguation failed</H3>";
 770         disambcell.innerHTML = title;
 771         var choices = get_choice_opts(curcp);
 772         for (var i = 0;i < choices.length;i++) {
 773             disambcell.appendChild(choices[i]);
 774             disambcell.appendChild(document.createTextNode(choices[i].getAttribute("desc")));
 775             disambcell.appendChild(document.createElement("br"));
 776         }
 777
 778         // update index of the next choicepoint
 779         new_curcp = (curcp + 1) % get_cps().length;
 780
 781         var okbutton = document.createElement("input");
 782         okbutton.setAttribute("type","button");
 783         okbutton.setAttribute("value","OK");
 784         okbutton.setAttribute("onclick","show_failures()");
 785         var cancelbutton = document.createElement("input");
 786         cancelbutton.setAttribute("type","button");
 787         cancelbutton.setAttribute("value","Close");
 788         cancelbutton.setAttribute("onclick","cancel_disambiguate()");
 789         var tryagainbutton = document.createElement("input");
 790         tryagainbutton.setAttribute("type","button");
 791         if (new_curcp > 0) {
 792             tryagainbutton.setAttribute("value","Try something else");
 793         } else {
 794             tryagainbutton.setAttribute("value","Restart");
 795         }
 796         tryagainbutton.setAttribute("onclick","next_cp(" + new_curcp + ")");
 797
 798         disambcell.appendChild(okbutton);
 799         disambcell.appendChild(tryagainbutton);
 800         disambcell.appendChild(cancelbutton);
 801
 802         //disable_toparea();
 803
 804         //matita.disambMode = true;
 805         updateSide();
 806
 807 }
 808
 809 function show_failures() {
 810
 811         var choice = document.getElementsByName("choice")[get_checked_index("choice")];
 812         var cpno = parseInt(choice.getAttribute("choicepointno"));
 813         var choiceno = parseInt(choice.getAttribute("choiceno"));
 814         var choicedesc = choice.getAttribute("desc");
 815
 816         var title = "<H3>Disambiguation failed</H3>";
 817         var subtitle = "<p>Errors at node " + cpno + " = " + choicedesc + "</p>";
 818
 819         disambcell.innerHTML = title + subtitle;
 820         var failures = get_failure_opts(cpno,choiceno);
 821         for (var i = 0;i < failures.length;i++) {
 822             disambcell.appendChild(failures[i]);
 823             disambcell.appendChild(document.createTextNode(failures[i].getAttribute("title")));
 824             disambcell.appendChild(document.createElement("br"));
 825         }
 826
 827         var okbutton = document.createElement("input");
 828         okbutton.setAttribute("type","button");
 829         okbutton.setAttribute("value","Show error loc");
 830         okbutton.setAttribute("onclick","show_err()");
 831         var cancelbutton = document.createElement("input");
 832         cancelbutton.setAttribute("type","button");
 833         cancelbutton.setAttribute("value","Close");
 834         cancelbutton.setAttribute("onclick","cancel_disambiguate()");
 835         var backbutton = document.createElement("input");
 836         backbutton.setAttribute("type","button");
 837         backbutton.setAttribute("value","<< Back");
 838         backbutton.setAttribute("onclick","next_cp(" + cpno + ")");
 839
 840         disambcell.appendChild(backbutton);
 841         disambcell.appendChild(okbutton);
 842         disambcell.appendChild(cancelbutton);
 843
 844 }
 845
 846 function show_err() {
 847         var radios = document.getElementsByName("failure");
 848         for (i = 0; i < radios.length; i++) {
 849             if (radios[i].checked) {
 850                 var start = radios[i].getAttribute("start");
 851                 var stop = radios[i].getAttribute("stop");
 852                 var title = radios[i].getAttribute("title");
 853                 var unlockedtxt = matita.unlockedbackup;
 854                 var pre = unlockedtxt.substring(0,start).matita_to_html();
 855                 var mid = unlockedtxt.substring(start,stop).matita_to_html();
 856                 var post = unlockedtxt.substring(stop).matita_to_html();
 857                 unlocked.innerHTML = pre +
 858                         "<span class=\"error\" title=\"Disambiguation failure\">" +
 859                         mid + "</span>" + post;
 860                 break;
 861             }
 862         }
 863 }
 864
 865 function gotoBottom()
 866 {
 867         processor = function(xml) {
 868                 if (is_defined(xml)) {
 869                         // debug("goto bottom: received response\nBEGIN\n" + req.responseText + "\nEND");
 870                         var parsed = xml.getElementsByTagName("parsed");
 871                         var localized = xml.getElementsByTagName("localized")[0];
 872                         var ambiguity = xml.getElementsByTagName("ambiguity")[0];
 873                         var generic_err = xml.getElementsByTagName("error")[0];
 874                         for (var i = 0;i < parsed.length; i++) {
 875                           var len = parsed[i].getAttribute("length");
 876                           // len0 = unlocked.innerHTML.length;
 877                           var unescaped = unlocked.innerHTML.html_to_matita();
 878                           // the browser may decide to split textnodes: use wholeText!
 879                           var parsedtxt = parsed[i].childNodes[0].wholeText;
 880                           //parsedtxt = unescaped.substr(0,len);
 881                           var unparsedtxt = unescaped.substr(len);
 882                           lockedbackup += parsedtxt;
 883                           locked.innerHTML = lockedbackup; //.matita_to_html();
 884                           unlocked.innerHTML = unparsedtxt.matita_to_html();
 885                           // len1 = unlocked.innerHTML.length;
 886                           var len2 = parsedtxt.length;
 887                           statements = listcons(len2,statements);
 888                         }
 889                         unlocked.scrollIntoView(true);
 890                         metasenv = xml.getElementsByTagName("meta");
 891                         init_autotraces();
 892                         populate_goalarray(metasenv);
 893
 894                         if (is_defined(ambiguity)) {
 895                             var start = parseInt(ambiguity.getAttribute("start"));
 896                             var stop = parseInt(ambiguity.getAttribute("stop"));
 897                             var choices = xml.getElementsByTagName("choice");
 898
 899                             matita.ambiguityStart = start;
 900                             matita.ambiguityStop = stop;
 901                             matita.unlockedbackup = unlocked.innerHTML.html_to_matita();
 902                             matita.interpretations = [];
 903
 904                             var unlockedtxt = unlocked.innerHTML.html_to_matita();
 905                             var pre = unlockedtxt.substring(0,start).matita_to_html();
 906                             var mid = unlockedtxt.substring(start,stop).matita_to_html();
 907                             var post = unlockedtxt.substring(stop).matita_to_html();
 908                             unlocked.innerHTML = pre +
 909                                     "<span class=\"error\" title=\"disambiguation error\">" +
 910                                     mid + "</span>" + post;
 911
 912                             var title = "<H3>Ambiguous input</H3>";
 913                             disambcell.innerHTML = title;
 914                             for (i = 0;i < choices.length;i++) {
 915                                 matita.interpretations[i] = new Object();
 916
 917                                 var href = choices[i].getAttribute("href");
 918                                 var title = choices[i].getAttribute("title");
 919                                 var desc = choices[i].childNodes[0].nodeValue;
 920
 921                                 matita.interpretations[i].href = href;
 922                                 matita.interpretations[i].title = title;
 923                                 matita.interpretations[i].desc = desc;
 924
 925                                 var choice = document.createElement("input");
 926                                 choice.setAttribute("type","radio");
 927                                 choice.setAttribute("name","interpr");
 928                                 choice.setAttribute("href",href);
 929                                 choice.setAttribute("title",title);
 930                                 if (i == 0) choice.setAttribute("checked","");
 931
 932                                 disambcell.appendChild(choice);
 933                                 disambcell.appendChild(document.createTextNode(desc));
 934                                 disambcell.appendChild(document.createElement("br"));
 935                             }
 936
 937                             var okbutton = document.createElement("input");
 938                             okbutton.setAttribute("type","button");
 939                             okbutton.setAttribute("value","OK");
 940                             okbutton.setAttribute("onclick","do_disambiguate()");
 941                             var cancelbutton = document.createElement("input");
 942                             cancelbutton.setAttribute("type","button");
 943                             cancelbutton.setAttribute("value","Cancel");
 944                             cancelbutton.setAttribute("onclick","cancel_disambiguate()");
 945
 946                             disambcell.appendChild(okbutton);
 947                             disambcell.appendChild(cancelbutton);
 948
 949                             disable_toparea();
 950
 951                             matita.disambMode = true;
 952                             updateSide();
 953                         }
 954                         if (is_defined(localized)) {
 955                             unlocked.innerHTML = localized.wholeText;
 956                         }
 957                         if (is_defined(generic_err)) {
 958                             debug("Unmanaged error:\n" ^ generic_err.wholeText);
 959                         }
 960                 } else {
 961                         debug("goto bottom failed");
 962                 }
 963                 resume();
 964         };
 965         pause();
 966         callServer("bottom",processor,"body=" + (unlocked.innerHTML.html_to_matita()).sescape());
 967 }
 968
 969
 970 function gotoTop()
 971 {
 972         processor = function(xml) {
 973                 if (is_defined(xml)) {
 974                   if (xml.childNodes[0].textContent != "ok") {
 975                      debug("goto top failed");
 976                   }
 977                   else
 978                         statements = listnil();
 979                         /*
 980                         lockedlen = locked.innerHTML.length - statementlen;
 981                         statement = locked.innerHTML.substr(lockedlen, statementlen);
 982                         locked.innerHTML = locked.innerHTML.substr(0,lockedlen);
 983                         unlocked.innerHTML = statement + unlocked.innerHTML;
 984                         */
 985                         unlocked.innerHTML = lockedbackup + unlocked.innerHTML;
 986                         lockedbackup = "";
 987                         locked.innerHTML = lockedbackup;
 988                         init_autotraces();
 989                         hideSequent();
 990                         unlocked.scrollIntoView(true);
 991                 } else {
 992                         debug("goto top failed");
 993                 }
 994                 resume();
 995         };
 996         pause();
 997         callServer("top",processor,"body=" + (unlocked.innerHTML.html_to_matita()).sescape());
 998
 999 }
1000
1001 function gotoPos(offset)
1002 {
1003         if (!is_defined(offset)) {
1004                 offset = getCursorPos();
1005         }
1006         processor = function(xml) {
1007                 if (is_defined(xml)) {
1008                     try {
1009                         /*
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                         */
1028                         var len = advOneStep(xml);
1029                         if (offset <= len) {
1030                                 init_autotraces();
1031                                 populate_goalarray(metasenv);
1032                                 resume();
1033                         } else {
1034                                 gotoPos(offset - len);
1035                         }
1036                     } catch (er) {
1037                         init_autotraces();
1038                         populate_goalarray(metasenv);
1039                         resume();
1040                     }
1041                 } else {
1042                         init_autotraces();
1043                         unlocked.scrollIntoView(true);
1044                         populate_goalarray(metasenv);
1045                         resume();
1046                 }
1047         }
1048         pause();
1049         callServer("advance",processor,"body=" + (unlocked.innerHTML.html_to_matita()).sescape());
1050 }
1051
1052 function retract()
1053 {
1054         processor = function(xml) {
1055                 if (typeof xml != "undefined") {
1056                         // debug("advance: received response\nBEGIN\n" + req.responseText + "\nEND");
1057                         statementlen = parseInt(listhd(statements));
1058                         statements = listtl(statements);
1059                         /*
1060                         lockedlen = locked.innerHTML.length - statementlen;
1061                         statement = locked.innerHTML.substr(lockedlen, statementlen);
1062                         locked.innerHTML = locked.innerHTML.substr(0,lockedlen);
1063                         unlocked.innerHTML = statement + unlocked.innerHTML;
1064                         */
1065                         lockedlen = lockedbackup.length - statementlen;
1066                         statement = lockedbackup.substr(lockedlen, statementlen);
1067                         lockedbackup = lockedbackup.substr(0,lockedlen);
1068                         locked.innerHTML = lockedbackup;
1069                         unlocked.innerHTML = statement + unlocked.innerHTML;
1070                         metasenv = xml.getElementsByTagName("meta");
1071                         init_autotraces();
1072                         populate_goalarray(metasenv);
1073                         unlocked.scrollIntoView(true);
1074                 } else {
1075                         debug("retract failed");
1076                 }
1077                 resume();
1078         };
1079         debug("retract 1");
1080         pause();
1081         callServer("retract",processor);
1082         debug("retract 2");
1083 }
1084
1085 function openFile()
1086 {
1087         processor = function(xml)
1088         {
1089                 if (is_defined(xml)) {
1090                         lockedbackup = "";
1091                         locked.innerHTML = lockedbackup;
1092                         unlocked.innerHTML = xml.documentElement.wholeText;
1093                 } else {
1094                         debug("file open failed");
1095                 }
1096         };
1097         callServer("open",processor,"file=" + escape(filename.value));
1098 }
1099
1100 function retrieveFile(thefile)
1101 {
1102         processor = function(xml)
1103         {
1104                 if (is_defined(xml)) {
1105                         changeFile(thefile);
1106                         lockedbackup = ""
1107                         locked.innerHTML = lockedbackup;
1108                         // code originally used in google chrome (problems with mozilla)
1109                         // debug(xml.getElementsByTagName("file")[0].childNodes[0].nodeValue);
1110                         // unlocked.innerHTML = xml.getElementsByTagName("file")[0].childNodes[0].nodeValue;
1111                         debug(xml.childNodes[0].textContent);
1112                         if (document.all) { // IE
1113                           unlocked.innerHTML = xml.childNodes[0].text;
1114                         } else {
1115                           unlocked.innerHTML = xml.childNodes[0].textContent;
1116                         }
1117                         init_autotraces();
1118
1119                 } else {
1120                         debug("file open failed");
1121                 }
1122         };
1123         abortDialog();
1124         callServer("open",processor,"file=" + escape(thefile));
1125 }
1126
1127 function showLibrary(title,callback,reloadDialog)
1128 {
1129         var req = null;
1130         dialogBox.reload = reloadDialog;
1131         // pause();
1132         if (window.XMLHttpRequest)
1133         {
1134                 req = new XMLHttpRequest();
1135         }
1136         else if (window.ActiveXObject)
1137         {
1138                 try {
1139                                 req = new ActiveXObject("Msxml2.XMLHTTP");
1140                 } catch (e)
1141                 {
1142                         try {
1143                                 req = new ActiveXObject("Microsoft.XMLHTTP");
1144                                 } catch (e) {}
1145                 }
1146         }
1147         req.onreadystatechange = function()
1148         {
1149
1150                 rs = req.readyState;
1151
1152                 if(rs == 4)
1153                 {
1154                         stat = req.status;
1155                         stxt = req.statusText;
1156                         if(stat == 200)
1157                         {
1158                           debug(req.responseText);
1159                           showDialog("<H2>" + title + "</H2>",req.responseText, callback);
1160                         }
1161                 }
1162         };
1163         req.open("POST", "viewlib"); // + escape(unlocked.innerHTML), true);
1164         req.setRequestHeader("Content-type","application/x-www-form-urlencoded");
1165         req.send();
1166
1167 }
1168
1169 function uploadDialog()
1170 {
1171         uploadBox.style.display = "block";
1172 }
1173
1174 function uploadOK()
1175 {
1176    var file = document.getElementById("uploadFilename").files[0];
1177    if (file) {
1178        var filecontent = file.getAsText("UTF-8");
1179        locked.innerHTML = lockedbackup;
1180        unlocked.innerHTML = filecontent;
1181        uploadBox.style.display = "none";
1182    }
1183 //   if (file) {
1184 //      var reader = new FileReader();
1185 //      reader.readAsText(file, "UTF-8");
1186 //       reader.onloadend = function (evt) {
1187 //         lockedbackup = "";
1188 //           locked.innerHTML = lockedbackup
1189 //           unlocked.innerHTML = evt.target.result;
1190 //           uploadBox.style.display = "none";
1191 //       }
1192 //       reader.onerror = function (evt) {
1193 //         debug("file open failed");
1194 //           uploadBox.style.display = "none";
1195 //      }
1196 //   }
1197 }
1198
1199 function openDialog()
1200 {
1201         callback = function (fname) { retrieveFile(fname); };
1202         showLibrary("Open file", callback, openDialog);
1203 }
1204
1205 function saveDialog()
1206 {
1207         callback = function (fname) {
1208           abortDialog();
1209           saveFile(fname,
1210                    (locked.innerHTML.html_to_matita()).sescape(),
1211                    (unlocked.innerHTML.html_to_matita()).sescape(),
1212                    false,saveDialog);
1213         };
1214         showLibrary("Save file as", callback, saveDialog);
1215 }
1216
1217 function newDialog()
1218 {
1219         callback = function (fname) {
1220           abortDialog();
1221           saveFile(fname,"","",false,newDialog,true);
1222         };
1223         showLibrary("Create new file", callback, newDialog);
1224 }
1225
1226
1227 function saveFile(fname,lockedtxt,unlockedtxt,force,reloadDialog,reloadFile)
1228 {
1229         if (!is_defined(reloadFile)) { reloadFile = true };
1230         if (!is_defined(fname)) {
1231             fname = current_fname;
1232             lockedtxt = (locked.innerHTML.html_to_matita()).sescape();
1233             unlockedtxt = (unlocked.innerHTML.html_to_matita()).sescape();
1234             force = true;
1235             // when force is true, reloadDialog is not needed
1236         }
1237         processor = function(xml) {
1238                 if (is_defined(xml)) {
1239                   if (xml.childNodes[0].textContent != "ok") {
1240                     if (confirm("File already exists. All existing data will be lost.\nDo you want to proceed anyway?")) {
1241                        saveFile(fname,lockedtxt,unlockedtxt,true,reloadDialog,reloadFile);
1242                     } else {
1243                       reloadDialog();
1244                     }
1245                   } else {
1246                     changeFile(fname);
1247                     debug("file saved!");
1248                     if (reloadFile) { retrieveFile(fname); }
1249                   }
1250                 } else {
1251                         debug("save file failed");
1252                 }
1253                 resume();
1254         };
1255         if (is_defined(fname)) {
1256           pause();
1257           callServer("save",processor,"file=" + escape(fname) +
1258                                     "&locked=" + lockedtxt +
1259                                     "&unlocked=" + unlockedtxt +
1260                                     "&force=" + force);
1261         }
1262         else { debug("no file selected"); }
1263 }
1264
1265 function createDir() {
1266    abortDialog();
1267    dirname = prompt("New directory name:\ncic:/matita/","newdir");
1268    if (dirname != null) {
1269         processor = function(xml) {
1270                 if (is_defined(xml)) {
1271                   if (xml.childNodes[0].textContent != "ok") {
1272                       alert("An error occurred :-(");
1273                   }
1274                 } else {
1275                       alert("An error occurred :-(");
1276                 }
1277                 dialogBox.reload();
1278         };
1279         pause();
1280         callServer("save",processor,"file=" + escape(dirname) +
1281                                     "&locked=&unlocked=&force=false&dir=true");
1282    } else {
1283       dialogBox.reload();
1284    }
1285 }
1286
1287 function commitAll()
1288 {
1289         processor = function(xml) {
1290                 if (is_defined(xml)) {
1291                         debug(xml.getElementsByTagName("details")[0].textContent);
1292                         alert("Commit executed: see details in the log.\n\n" +
1293                               "NOTICE: this message does NOT imply (yet) that the commit was successful.");
1294                 } else {
1295                         alert("Commit failed!");
1296                 }
1297                 resume();
1298         };
1299         pause();
1300         callServer("commit",processor);
1301 }
1302
1303 function updateAll()
1304 {
1305         processor = function(xml) {
1306                 if (is_defined(xml)) {
1307                         alert("Update executed.\n\n" +
1308                               "Details:\n" +
1309                               xml.getElementsByTagName("details")[0].textContent);
1310                 } else {
1311                         alert("Update failed!");
1312                 }
1313                 resume();
1314         };
1315         pause();
1316         callServer("update",processor);
1317 }
1318
1319 var goalcell;
1320
1321 function hideSequent() {
1322         matita.proofMode = false;
1323         updateSide();
1324 }
1325
1326 function showSequent() {
1327         matita.proofMode = true;
1328         updateSide();
1329 }
1330
1331 function showDialog(title,content,callback) {
1332   dialogTitle.innerHTML = title;
1333   dialogContent.innerHTML = content;
1334   dialogBox.callback = callback;
1335
1336   //Get the screen height and width
1337   var maskHeight = $(document).height();
1338   var maskWidth = $(window).width();
1339
1340   //Set heigth and width to mask to fill up the whole screen
1341   $('#mask').css({'width':maskWidth,'height':maskHeight});
1342
1343   //transition effect
1344   $('#mask').fadeIn(100);
1345   $('#mask').fadeTo(200,0.8);
1346
1347   //Get the window height and width
1348   var winH = $(window).height();
1349   var winW = $(window).width();
1350
1351   //Set the popup window to center
1352   $('#dialogBox').css('top',  winH/2-$('#dialogBox').height()/2);
1353   $('#dialogBox').css('left', winW/2-$('#dialogBox').width()/2);
1354
1355   //transition effect
1356   $('#dialogBox').fadeIn(200);
1357
1358   dialogBox.style.display = "block";
1359 }
1360
1361 function abortDialog(dialog) {
1362   $('#mask').hide();
1363   dialogBox.style.display = "none";
1364 }
1365
1366 function removeElement(id) {
1367   var element = document.getElementById(id);
1368   element.parentNode.removeChild(element);
1369 }
1370
1371 var savedsc;
1372 var savedso;
1373
1374 function getCursorPos() {
1375   var cursorPos;
1376   if (window.getSelection) {
1377     var selObj = window.getSelection();
1378     savedRange = selObj.getRangeAt(0);
1379     savedsc = savedRange.startContainer;
1380     savedso = savedRange.startOffset;
1381     //cursorPos =  findNode(selObj.anchorNode.parentNode.childNodes, selObj.anchorNode) + selObj.anchorOffset;
1382     cursorPos =  findNode(unlocked.childNodes, selObj.anchorNode,0) + selObj.anchorOffset;
1383     /* FIXME the following works wrong in Opera when the document is longer than 32767 chars */
1384     return(cursorPos);
1385   }
1386   else if (document.selection) {
1387     savedRange = document.selection.createRange();
1388     var bookmark = savedRange.getBookmark();
1389     /* FIXME the following works wrong when the document is longer than 65535 chars */
1390     cursorPos = bookmark.charCodeAt(2) - 11; /* Undocumented function [3] */
1391     return(cursorPos);
1392   }
1393 }
1394
1395 function findNode(list, node, acc) {
1396   for (var i = 0; i < list.length; i++) {
1397     if (list[i] == node) {
1398    //   debug("success " + i);
1399       return acc;
1400     }
1401     if (list[i].hasChildNodes()) {
1402        try {
1403    //      debug("recursion on node " + i);
1404          return (findNode(list[i].childNodes,node,acc))
1405        }
1406        catch (e) { /* debug("recursion failed"); */ }
1407     }
1408     sandbox = document.getElementById("sandbox");
1409     dup = list[i].cloneNode(true);
1410     sandbox.appendChild(dup);
1411 //    debug("fail " + i + ": " + sandbox.innerHTML);
1412     acc += sandbox.innerHTML.html_to_matita().length;
1413     sandbox.removeChild(dup);
1414   }
1415   throw "not found";
1416 }
1417
1418 function test () {
1419   debug("cursor test: " + unlocked.innerHTML.substr(0,getCursorPos()));
1420 }
1421
1422 function get_checked_index(name) {
1423         var radios = document.getElementsByName(name);
1424         for (i = 0; i < radios.length; i++) {
1425             if (radios[i].checked) {
1426                     return i;
1427             }
1428         }
1429         return null;
1430 }
1431
1432 function cancel_disambiguate() {
1433         matita.disambMode = false;
1434         enable_toparea();
1435         enable_editing();
1436         updateSide();
1437 }
1438
1439 function do_disambiguate() {
1440         var i = get_checked_index("interpr");
1441         if (i != null) {
1442             var pre = matita.unlockedbackup
1443                       .substring(0,matita.ambiguityStart).matita_to_html();
1444             var mid = matita.unlockedbackup
1445                       .substring(matita.ambiguityStart,matita.ambiguityStop)
1446                       .matita_to_html();
1447             var post = matita.unlockedbackup
1448                        .substring(matita.ambiguityStop).matita_to_html();
1449
1450             var href = matita.interpretations[i].href;
1451             var title = matita.interpretations[i].title;
1452
1453             if (is_defined(title)) {
1454                 mid = "<A href=\"" + href + "\" title=\"" + title + "\">" + mid + "</A>";
1455             } else {
1456                 mid = "<A href=\"" + href + "\">" + mid + "</A>";
1457             }
1458
1459             unlocked.innerHTML = pre + mid + post;
1460
1461             matita.disambMode = false;
1462             enable_toparea();
1463             enable_editing();
1464             updateSide();
1465         }
1466 }
1467
1468 function do_showerror() {
1469         var i = get_checked_index("choice");
1470         if (i != null) {
1471             var pre = matita.unlockedbackup
1472                       .substring(0,matita.ambiguityStart).matita_to_html();
1473             var mid = matita.unlockedbackup
1474                       .substring(matita.ambiguityStart,matita.ambiguityStop)
1475                       .matita_to_html();
1476             var post = matita.unlockedbackup
1477                        .substring(matita.ambiguityStop).matita_to_html();
1478
1479             var href = matita.interpretations[i].href;
1480             var title = matita.interpretations[i].title;
1481
1482             if (is_defined(title)) {
1483                 mid = "<A href=\"" + href + "\" title=\"" + title + "\">" + mid + "</A>";
1484             } else {
1485                 mid = "<A href=\"" + href + "\">" + mid + "</A>";
1486             }
1487
1488             unlocked.innerHTML = pre + mid + post;
1489
1490         }
1491 }
1492
1493 function readCookie(name) {
1494         var nameEQ = name + "=";
1495         var ca = document.cookie.split(';');
1496         for(var i=0;i < ca.length;i++) {
1497                 var c = ca[i];
1498                 while (c.charAt(0)==' ') c = c.substring(1,c.length);
1499                 if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
1500         }
1501         return null;
1502 }
1503
1504 function delete_cookie ( cookie_name )
1505 {
1506   var cookie_date = new Date();  // current date & time
1507   cookie_date.setTime ( cookie_date.getTime() - 1 );
1508   document.cookie = cookie_name += "=; expires=" + cookie_date.toGMTString();
1509 }
1510
1511 function delete_session()
1512 {
1513         delete_cookie("session");
1514 }
1515
1516 function disable_toparea() {
1517         var offset = $('#toparea').offset();
1518         $('#whitemask').css('top',offset.top);
1519         $('#whitemask').css('left',offset.left);
1520         $('#whitemask').css('width',$('#toparea').outerWidth() + "px");
1521         $('#whitemask').css('height',$('#toparea').outerHeight() + "px");
1522         $('#whitemask').fadeTo('fast',0.7);
1523 }
1524
1525 function enable_toparea() {
1526         $('#whitemask').hide();
1527 }
1528
1529 function disable_editing() {
1530         unlocked.contentEditable = false;
1531 }
1532
1533 function enable_editing() {
1534         unlocked.contentEditable = true;
1535 }
1536
1537 function pause()
1538 {
1539         // advanceButton.disabled = true;
1540         // retractButton.disabled = true;
1541         // cursorButton.disabled = true;
1542         // bottomButton.disabled = true;
1543         disable_toparea();
1544         disable_editing();
1545 }
1546
1547 function resume()
1548 {
1549         // advanceButton.disabled = false;
1550         // retractButton.disabled = false;
1551         // cursorButton.disabled = false;
1552         // bottomButton.disabled = false;
1553         enable_toparea();
1554         enable_editing();
1555 }
1556