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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     for (var i = 0;tags.length > i;i++) {
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             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             matita.disambMode = true;
646             updateSide();
647             throw "Wait";
648         }
649         else if (is_defined(disamberr)) {
650             // must be fixed in a daemon: it makes sense to return a 
651             // disambiguation error with no choices
652             if (disamberr.childNodes.length > 0) {
653               set_cps(disamberr.childNodes);
654               matita.unlockedbackup = unlocked.innerHTML.html_to_matita();
655               matita.disambMode = true;
656               next_cp(0);
657             }
658             throw "Wait";
659         }
660         else {
661             var error = xml.getElementsByTagName("error")[0]; 
662             unlocked.innerHTML = error.childNodes[0].wholeText;
663             // debug(xml.childNodes[0].nodeValue);
664             throw "Stop";
665         }
666
667 }
668
669 function advanceForm1()
670 {
671         processor = function(xml) {
672            try {
673                 if (is_defined(xml)) {
674                     advOneStep(xml);
675                     populate_goalarray(metasenv);
676                     init_autotraces();
677                 } else {
678                         debug("advance failed");
679                 }
680             } catch (e) { 
681                     if (e == "Stop") 
682                             resume();
683                     else 
684                             pause();
685             };
686         };
687         pause();
688         callServer("advance",processor,"body=" + (unlocked.innerHTML.html_to_matita()).sescape());
689   
690 }
691
692 // get or set <choicepoint>'s (in case of disamb error)
693 function get_cps() {
694         return matita.choicepoints
695 }
696
697 function set_cps(cps) {
698         matita.choicepoints = cps;
699 }
700
701 // get radio buttons for <choice>'s in a given cp
702 function get_choice_opts(i) {
703    var res = [];
704    var choices = get_cps()[i].childNodes;
705    for (var j = 0;j < choices.length;j++) {
706       var href = choices[j].getAttribute("href");
707       var title = choices[j].getAttribute("title");
708       var desc;
709       if (is_defined(title) && title != null) {
710            desc = title;
711       } else if (is_defined(href) && href != null) {
712            desc = href;
713       } else {
714            desc = null;
715       }
716   
717       res[j] = document.createElement("input");
718       res[j].setAttribute("type","radio");
719       res[j].setAttribute("name","choice");
720       res[j].setAttribute("choicepointno",i);
721       res[j].setAttribute("choiceno",j);
722       res[j].setAttribute("href",href);
723       res[j].setAttribute("title",title);
724       if (desc != null) res[j].setAttribute("desc",desc);
725       
726       if (j == 0) res[j].setAttribute("checked","");
727   }
728   return res;
729 }
730
731 // get radio buttons for <failure>'s in a given choice
732 function get_failure_opts(i,j) {
733    var res = [];
734    var failures = get_cps()[i].childNodes[j].childNodes;
735    for (var k = 0;k < failures.length;k++) {
736       var start = failures[k].getAttribute("start");
737       var stop = failures[k].getAttribute("stop");
738       var title = failures[k].getAttribute("title");
739   
740       res[k] = document.createElement("input");
741       res[k].setAttribute("type","radio");
742       res[k].setAttribute("name","failure");
743       res[k].setAttribute("choicepointno",i);
744       res[k].setAttribute("choiceno",j);
745       res[k].setAttribute("failureno",k);
746       res[k].setAttribute("start",start);
747       res[k].setAttribute("stop",stop);
748       res[k].setAttribute("title",title);
749       
750       if (k == 0) res[k].setAttribute("checked","");
751   }
752   return res;
753 }
754
755 function next_cp(curcp) {
756         var cp = get_cps()[curcp];
757         var start = parseInt(cp.getAttribute("start"));
758         var stop = parseInt(cp.getAttribute("stop"));
759
760         matita.errorStart = start;
761         matita.errorStop = stop;
762         // matita.unlockedbackup = unlocked.innerHTML.html_to_matita();
763         
764         var unlockedtxt = matita.unlockedbackup;
765         var pre = unlockedtxt.substring(0,start).matita_to_html();
766         var mid = unlockedtxt.substring(start,stop).matita_to_html();
767         var post = unlockedtxt.substring(stop).matita_to_html();
768         unlocked.innerHTML = pre + 
769                 "<span class=\"error\" title=\"error location\">" +
770                 mid + "</span>" + post;
771
772         var title = "<H3>Error diagnostics</H3>";
773         disambcell.innerHTML = title;
774         var choices = get_choice_opts(curcp);
775         for (var i = 0;i < choices.length;i++) {
776             disambcell.appendChild(choices[i]);
777             var desc = choices[i].getAttribute("desc");
778             if (!is_defined(desc) || desc == null) {
779                     desc = "Interpretation " + i;
780             }
781             disambcell.appendChild(document.createTextNode(desc));
782             disambcell.appendChild(document.createElement("br"));
783         }
784         
785         // update index of the next choicepoint
786         new_curcp = (curcp + 1) % get_cps().length;
787
788         var okbutton = document.createElement("input");
789         okbutton.setAttribute("type","button");
790         okbutton.setAttribute("value","OK");
791         okbutton.setAttribute("onclick","show_failures()");
792         var cancelbutton = document.createElement("input");
793         cancelbutton.setAttribute("type","button");
794         cancelbutton.setAttribute("value","Close");
795         cancelbutton.setAttribute("onclick","cancel_disambiguate()");
796         var tryagainbutton = document.createElement("input");
797         tryagainbutton.setAttribute("type","button");
798         if (new_curcp > 0) {
799             tryagainbutton.setAttribute("value","None of the above");
800         } else {
801             tryagainbutton.setAttribute("value","Restart");
802         }
803         tryagainbutton.setAttribute("onclick","next_cp(" + new_curcp + ")");
804
805         disambcell.appendChild(okbutton);
806         disambcell.appendChild(tryagainbutton);
807         disambcell.appendChild(cancelbutton);
808
809         //disable_toparea();
810
811         //matita.disambMode = true;
812         updateSide();
813         
814 }
815
816 function show_failures() {
817
818         var choice = document.getElementsByName("choice")[get_checked_index("choice")];
819         var cpno = parseInt(choice.getAttribute("choicepointno"));
820         var choiceno = parseInt(choice.getAttribute("choiceno"));
821         var choicedesc = choice.getAttribute("desc");
822
823         var title = "<H3>Error diagnostics</H3>";
824         var subtitle;
825         if (is_defined(choicedesc) && choicedesc != null) {
826                 subtitle  = "<p>Errors at node " + cpno + " = " + choicedesc + "</p>";
827         } else {
828                 subtitle = "<p>Global errors:</p>";
829         }
830
831         disambcell.innerHTML = title + subtitle;
832         var failures = get_failure_opts(cpno,choiceno);
833         for (var i = 0;i < failures.length;i++) {
834             disambcell.appendChild(failures[i]);
835             disambcell.appendChild(document.createTextNode(failures[i].getAttribute("title")));
836             disambcell.appendChild(document.createElement("br"));
837         }
838         
839         var okbutton = document.createElement("input");
840         okbutton.setAttribute("type","button");
841         okbutton.setAttribute("value","Show error loc");
842         okbutton.setAttribute("onclick","show_err()");
843         var cancelbutton = document.createElement("input");
844         cancelbutton.setAttribute("type","button");
845         cancelbutton.setAttribute("value","Close");
846         cancelbutton.setAttribute("onclick","cancel_disambiguate()");
847         var backbutton = document.createElement("input");
848         backbutton.setAttribute("type","button");
849         backbutton.setAttribute("value","<< Go back");
850         backbutton.setAttribute("onclick","next_cp(" + cpno + ")");
851
852         disambcell.appendChild(backbutton);
853         disambcell.appendChild(okbutton);
854         disambcell.appendChild(cancelbutton);
855         
856 }
857
858 function show_err() {
859         var radios = document.getElementsByName("failure");
860         for (i = 0; i < radios.length; i++) {
861             if (radios[i].checked) {
862                 var start = radios[i].getAttribute("start");
863                 var stop = radios[i].getAttribute("stop");
864                 var title = radios[i].getAttribute("title");
865                 var unlockedtxt = matita.unlockedbackup;
866                 var pre = unlockedtxt.substring(0,start).matita_to_html();
867                 var mid = unlockedtxt.substring(start,stop).matita_to_html();
868                 var post = unlockedtxt.substring(stop).matita_to_html();
869                 unlocked.innerHTML = pre + 
870                         "<span class=\"error\" title=\"Disambiguation failure\">" +
871                         mid + "</span>" + post;
872                 break;
873             }
874         }
875 }
876
877 function gotoBottom()
878 {
879         processor = function(xml) {
880                 if (is_defined(xml)) {
881                         // debug("goto bottom: received response\nBEGIN\n" + req.responseText + "\nEND");
882                         var parsed = xml.getElementsByTagName("parsed");
883                         var localized = xml.getElementsByTagName("localized")[0];
884                         var ambiguity = xml.getElementsByTagName("ambiguity")[0];
885                         var generic_err = xml.getElementsByTagName("error")[0];
886                         var disamberr = xml.getElementsByTagName("disamberror")[0];
887                         for (var i = 0;i < parsed.length; i++) {
888                           var len = parsed[i].getAttribute("length");
889                           // len0 = unlocked.innerHTML.length;
890                           var unescaped = unlocked.innerHTML.html_to_matita();
891                           // the browser may decide to split textnodes: use wholeText!
892                           var parsedtxt = parsed[i].childNodes[0].wholeText;
893                           //parsedtxt = unescaped.substr(0,len); 
894                           var unparsedtxt = unescaped.substr(len);
895                           lockedbackup += parsedtxt;
896                           locked.innerHTML = lockedbackup; //.matita_to_html();
897                           unlocked.innerHTML = unparsedtxt.matita_to_html();
898                           // len1 = unlocked.innerHTML.length;
899                           var len2 = parsedtxt.length;
900                           statements = listcons(len2,statements);
901                         }
902                         unlocked.scrollIntoView(true);
903                         metasenv = xml.getElementsByTagName("meta");
904                         init_autotraces();
905                         populate_goalarray(metasenv);
906
907                         if (is_defined(ambiguity)) {
908                             var start = parseInt(ambiguity.getAttribute("start"));
909                             var stop = parseInt(ambiguity.getAttribute("stop"));
910                             var choices = xml.getElementsByTagName("choice");
911
912                             matita.ambiguityStart = start;
913                             matita.ambiguityStop = stop;
914                             matita.unlockedbackup = unlocked.innerHTML.html_to_matita();
915                             matita.interpretations = [];
916                         
917                             var unlockedtxt = unlocked.innerHTML.html_to_matita();
918                             var pre = unlockedtxt.substring(0,start).matita_to_html();
919                             var mid = unlockedtxt.substring(start,stop).matita_to_html();
920                             var post = unlockedtxt.substring(stop).matita_to_html();
921                             unlocked.innerHTML = pre + 
922                                     "<span class=\"error\" title=\"disambiguation error\">" +
923                                     mid + "</span>" + post;
924
925                             var title = "<H3>Ambiguous input</H3>";
926                             disambcell.innerHTML = title;
927                             for (i = 0;i < choices.length;i++) {
928                                 matita.interpretations[i] = new Object();
929
930                                 var href = choices[i].getAttribute("href");
931                                 var title = choices[i].getAttribute("title");
932                                 var desc = choices[i].childNodes[0].nodeValue;
933
934                                 matita.interpretations[i].href = href;
935                                 matita.interpretations[i].title = title;
936                                 matita.interpretations[i].desc = desc;
937                                 
938                                 var choice = document.createElement("input");
939                                 choice.setAttribute("type","radio");
940                                 choice.setAttribute("name","interpr");
941                                 choice.setAttribute("href",href);
942                                 choice.setAttribute("title",title);
943                                 if (i == 0) choice.setAttribute("checked","");
944                                 
945                                 disambcell.appendChild(choice);
946                                 disambcell.appendChild(document.createTextNode(desc));
947                                 disambcell.appendChild(document.createElement("br"));
948                             }
949
950                             var okbutton = document.createElement("input");
951                             okbutton.setAttribute("type","button");
952                             okbutton.setAttribute("value","OK");
953                             okbutton.setAttribute("onclick","do_disambiguate()");
954                             var cancelbutton = document.createElement("input");
955                             cancelbutton.setAttribute("type","button");
956                             cancelbutton.setAttribute("value","Cancel");
957                             cancelbutton.setAttribute("onclick","cancel_disambiguate()");
958
959                             disambcell.appendChild(okbutton);
960                             disambcell.appendChild(cancelbutton);
961
962                             matita.disambMode = true;
963                             updateSide();
964                         }
965                         else if (is_defined(disamberr)) {
966                             // must be fixed in a daemon: it makes sense to return a 
967                             // disambiguation error with no choices
968                             if (disamberr.childNodes.length > 0) {
969                               set_cps(disamberr.childNodes);
970                               matita.unlockedbackup = unlocked.innerHTML.html_to_matita();
971                               matita.disambMode = true;
972                               next_cp(0);
973                             }
974                             throw "Stop";
975                         }
976                         else if (is_defined(localized)) {
977                             unlocked.innerHTML = localized.childNodes[0].wholeText;
978                         }
979                         else if (is_defined(generic_err)) {
980                             debug("Unmanaged error:\n" ^ generic_err.childNodes[0].wholeText);
981                         }
982                 } else {
983                         debug("goto bottom failed");
984                 } 
985                 resume();
986         };
987         pause();
988         callServer("bottom",processor,"body=" + (unlocked.innerHTML.html_to_matita()).sescape());
989 }
990
991
992 function gotoTop()
993 {
994         processor = function(xml) {
995                 if (is_defined(xml)) {
996                   if (xml.childNodes[0].textContent != "ok") {
997                      debug("goto top failed");
998                   }
999                   else
1000                         statements = listnil();
1001                         /*
1002                         lockedlen = locked.innerHTML.length - statementlen;
1003                         statement = locked.innerHTML.substr(lockedlen, statementlen);
1004                         locked.innerHTML = locked.innerHTML.substr(0,lockedlen);
1005                         unlocked.innerHTML = statement + unlocked.innerHTML;
1006                         */
1007                         unlocked.innerHTML = lockedbackup + unlocked.innerHTML;
1008                         lockedbackup = "";
1009                         locked.innerHTML = lockedbackup;
1010                         init_autotraces();
1011                         hideSequent();
1012                         unlocked.scrollIntoView(true);
1013                 } else {
1014                         debug("goto top failed");
1015                 } 
1016                 resume();
1017         };
1018         pause();
1019         callServer("top",processor,"body=" + (unlocked.innerHTML.html_to_matita()).sescape());
1020   
1021 }
1022
1023 function gotoPos(offset)
1024 {
1025         if (!is_defined(offset)) {
1026                 offset = getCursorPos();
1027         }
1028         processor = function(xml) {
1029                 if (is_defined(xml)) {
1030                     try {
1031                         /*
1032                         parsed = xml.getElementsByTagName("parsed")[0];
1033                         len = parseInt(parsed.getAttribute("length"));
1034                         // len0 = unlocked.innerHTML.length;
1035                         unescaped = unlocked.innerHTML.html_to_matita();
1036                         parsedtxt = parsed.childNodes[0].wholeText;
1037                         //parsedtxt = unescaped.substr(0,len); 
1038                         unparsedtxt = unescaped.substr(len);
1039                         lockedbackup += parsedtxt;
1040                         locked.innerHTML = lockedbackup; //.matita_to_html();
1041                         unlocked.innerHTML = unparsedtxt.matita_to_html();
1042                         // len1 = unlocked.innerHTML.length;
1043                         len2 = parsedtxt.length;
1044                         metasenv = xml.getElementsByTagName("meta");
1045                         // populate_goalarray(metasenv);
1046                         statements = listcons(len2,statements);
1047                         unlocked.scrollIntoView(true);
1048                         // la populate non andrebbe fatta a ogni passo
1049                         */
1050                         var len = advOneStep(xml);
1051                         if (offset <= len) {
1052                                 init_autotraces();
1053                                 populate_goalarray(metasenv);
1054                                 resume();
1055                         } else {
1056                                 gotoPos(offset - len);
1057                         }
1058                     } catch (er) {
1059                         init_autotraces();
1060                         populate_goalarray(metasenv);
1061                         if (er == "Stop") 
1062                                 resume();
1063                         else
1064                                 pause();
1065
1066                     }
1067                 } else {
1068                         init_autotraces();
1069                         unlocked.scrollIntoView(true);
1070                         populate_goalarray(metasenv);
1071                         resume();
1072                 }
1073         }
1074         pause();
1075         callServer("advance",processor,"body=" + (unlocked.innerHTML.html_to_matita()).sescape());
1076 }
1077
1078 function retract()
1079 {
1080         processor = function(xml) {
1081                 if (typeof xml != "undefined") {
1082                         // debug("advance: received response\nBEGIN\n" + req.responseText + "\nEND");
1083                         statementlen = parseInt(listhd(statements));
1084                         statements = listtl(statements);
1085                         /*
1086                         lockedlen = locked.innerHTML.length - statementlen;
1087                         statement = locked.innerHTML.substr(lockedlen, statementlen);
1088                         locked.innerHTML = locked.innerHTML.substr(0,lockedlen);
1089                         unlocked.innerHTML = statement + unlocked.innerHTML;
1090                         */
1091                         lockedlen = lockedbackup.length - statementlen;
1092                         statement = lockedbackup.substr(lockedlen, statementlen);
1093                         lockedbackup = lockedbackup.substr(0,lockedlen);
1094                         locked.innerHTML = lockedbackup;
1095                         unlocked.innerHTML = statement + unlocked.innerHTML;
1096                         metasenv = xml.getElementsByTagName("meta");
1097                         init_autotraces();
1098                         populate_goalarray(metasenv);
1099                         unlocked.scrollIntoView(true);
1100                 } else {
1101                         debug("retract failed");
1102                 }
1103                 resume();
1104         };
1105         pause();
1106         callServer("retract",processor);
1107 }
1108
1109 function openFile()
1110
1111         processor = function(xml)
1112         {
1113                 if (is_defined(xml)) {  
1114                         lockedbackup = "";
1115                         locked.innerHTML = lockedbackup;
1116                         unlocked.innerHTML = xml.documentElement.wholeText;
1117                 } else {
1118                         debug("file open failed");
1119                 }
1120         };
1121         callServer("open",processor,"file=" + escape(filename.value)); 
1122 }
1123
1124 function retrieveFile(thefile)
1125
1126         processor = function(xml)
1127         {
1128                 if (is_defined(xml)) {  
1129                         changeFile(thefile);
1130                         matita.disambMode = false;
1131                         matita.proofMode = false;
1132                         updateSide();
1133                         lockedbackup = ""
1134                         locked.innerHTML = lockedbackup;
1135                         // code originally used in google chrome (problems with mozilla)
1136                         // debug(xml.getElementsByTagName("file")[0].childNodes[0].nodeValue);
1137                         // unlocked.innerHTML = xml.getElementsByTagName("file")[0].childNodes[0].nodeValue;
1138                         debug(xml.childNodes[0].textContent);
1139                         if (document.all) { // IE
1140                           unlocked.innerHTML = xml.childNodes[0].text;
1141                         } else {
1142                           unlocked.innerHTML = xml.childNodes[0].textContent;
1143                         }
1144                         init_autotraces();
1145
1146                 } else {
1147                         debug("file open failed");
1148                 }
1149         };
1150         abortDialog("dialogBox");
1151         callServer("open",processor,"file=" + escape(thefile)); 
1152 }
1153
1154 function showLibrary(title,callback,reloadDialog)
1155
1156         var req = null;
1157         dialogBox.reload = reloadDialog; 
1158         // pause();
1159         if (window.XMLHttpRequest)
1160         {
1161                 req = new XMLHttpRequest();
1162         } 
1163         else if (window.ActiveXObject) 
1164         {
1165                 try {
1166                                 req = new ActiveXObject("Msxml2.XMLHTTP");
1167                 } catch (e)
1168                 {
1169                         try {
1170                                 req = new ActiveXObject("Microsoft.XMLHTTP");
1171                                 } catch (e) {}
1172                 }
1173         }
1174         req.onreadystatechange = function()
1175         { 
1176
1177                 rs = req.readyState;
1178
1179                 if(rs == 4)
1180                 {
1181                         stat = req.status;
1182                         stxt = req.statusText;
1183                         if(stat == 200)
1184                         {
1185                           debug(req.responseText);
1186                           showDialog("<H2>" + title + "</H2>",req.responseText, callback);
1187                         } 
1188                 } 
1189         };
1190         req.open("POST", "viewlib"); // + escape(unlocked.innerHTML), true);
1191         req.setRequestHeader("Content-type","application/x-www-form-urlencoded");       
1192         req.send();
1193   
1194 }
1195
1196 function uploadDialog()
1197 {  
1198         uploadBox.style.display = "block";
1199 }
1200
1201 function uploadOK()
1202 {   
1203    var file = document.getElementById("uploadFilename").files[0];
1204 //   if (file) { 
1205 //       var filecontent = file.getAsText("UTF-8");
1206 //       locked.innerHTML = lockedbackup;
1207 //       unlocked.innerHTML = filecontent;
1208 //       uploadBox.style.display = "none";
1209 //   }
1210    if (file) { 
1211       var reader = new FileReader();
1212       reader.onerror = function (evt) {
1213            debug("file open failed");
1214       }
1215       reader.onload = function (evt) {
1216            lockedbackup = "";
1217            locked.innerHTML = lockedbackup;
1218            unlocked.innerHTML = "";
1219            unlocked.appendChild(document.createTextNode(evt.target.result));
1220            uploadBox.style.display = "none";
1221       }
1222       try { reader.readAsText(file, "UTF-8"); }
1223       catch (err) { /* nothing to do */ };
1224       uploadBox.style.display = "none";
1225    }
1226 }
1227
1228 function openDialog()
1229 {  
1230         callback = function (fname) { retrieveFile(fname); };
1231         showLibrary("Open file", callback, openDialog);
1232 }
1233
1234 function saveDialog()
1235 {  
1236         callback = function (fname) { 
1237           abortDialog("dialogBox");
1238           saveFile(fname,
1239                    (locked.innerHTML.html_to_matita()).sescape(),
1240                    (unlocked.innerHTML.html_to_matita()).sescape(),
1241                    false,saveDialog); 
1242         };
1243         showLibrary("Save file as", callback, saveDialog);
1244 }
1245
1246 function newDialog()
1247 {
1248         callback = function (fname) { 
1249           abortDialog("dialogBox");
1250           saveFile(fname,"","",false,newDialog,true);
1251         };
1252         showLibrary("Create new file", callback, newDialog);
1253 }
1254
1255
1256 function saveFile(fname,lockedtxt,unlockedtxt,force,reloadDialog,reloadFile)
1257 {
1258         if (!is_defined(reloadFile)) { reloadFile = true };
1259         if (!is_defined(fname)) {
1260             fname = current_fname;
1261             lockedtxt = (locked.innerHTML.html_to_matita()).sescape();
1262             unlockedtxt = (unlocked.innerHTML.html_to_matita()).sescape();
1263             force = true;
1264             // when force is true, reloadDialog is not needed 
1265         }
1266         processor = function(xml) {
1267                 if (is_defined(xml)) {
1268                   if (xml.childNodes[0].textContent != "ok") {
1269                     if (confirm("File already exists. All existing data will be lost.\nDo you want to proceed anyway?")) {
1270                        saveFile(fname,lockedtxt,unlockedtxt,true,reloadDialog,reloadFile);
1271                     } else {
1272                       reloadDialog();
1273                     }
1274                   } else {
1275                     changeFile(fname);
1276                     debug("file saved!");
1277                     if (reloadFile) { retrieveFile(fname); }
1278                   }
1279                 } else {
1280                         debug("save file failed");
1281                 }
1282                 resume();
1283         };
1284         if (is_defined(fname)) {
1285           pause();
1286           callServer("save",processor,"file=" + escape(fname) + 
1287                                     "&locked=" + lockedtxt +
1288                                     "&unlocked=" + unlockedtxt +
1289                                     "&force=" + force);
1290         }
1291         else { debug("no file selected"); }
1292 }
1293
1294 function createDir() {
1295    abortDialog("dialogBox");
1296    dirname = prompt("New directory name:\ncic:/matita/","newdir");
1297    if (dirname != null) {
1298         processor = function(xml) {
1299                 if (is_defined(xml)) {
1300                   if (xml.childNodes[0].textContent != "ok") {
1301                       alert("An error occurred :-(");
1302                   }
1303                 } else {
1304                       alert("An error occurred :-(");
1305                 }
1306                 dialogBox.reload();
1307         };
1308         pause();
1309         callServer("save",processor,"file=" + escape(dirname) + 
1310                                     "&locked=&unlocked=&force=false&dir=true");
1311    } else {
1312       dialogBox.reload();
1313    }
1314 }
1315
1316 function commitAll()
1317 {
1318         processor = function(xml) {
1319                 if (is_defined(xml)) {
1320                         debug(xml.getElementsByTagName("details")[0].textContent);
1321                         alert("Commit executed: see details in the log.\n\n" +
1322                               "NOTICE: this message does NOT imply (yet) that the commit was successful.");
1323                 } else {
1324                         alert("Commit failed!\n(maybe you don't have permissionis to commit?)");
1325                 }
1326                 resume();
1327         };
1328         pause();
1329         callServer("commit",processor);
1330 }
1331
1332 function updateAll()
1333 {
1334         processor = function(xml) {
1335                 if (is_defined(xml)) {
1336                         alert("Update executed.\n\n" +
1337                               "Details:\n" +
1338                               xml.getElementsByTagName("details")[0].textContent);
1339                 } else {
1340                         alert("Update failed!\n(maybe you don't have permissions to update?)");
1341                 }
1342                 resume();
1343         };
1344         pause();
1345         callServer("update",processor);
1346 }
1347
1348 var goalcell;
1349
1350 function hideSequent() {
1351         matita.proofMode = false;
1352         updateSide();
1353 }
1354
1355 function showSequent() {
1356         matita.proofMode = true;
1357         updateSide();
1358 }
1359
1360 function showDialog(title,content,callback) {
1361   dialogTitle.innerHTML = title;
1362   dialogContent.innerHTML = content;
1363   dialogBox.callback = callback;
1364
1365   //Get the screen height and width
1366   var maskHeight = $(document).height();
1367   var maskWidth = $(window).width();
1368   
1369   //Set heigth and width to mask to fill up the whole screen
1370   $('#mask').css({'width':maskWidth,'height':maskHeight});
1371   
1372   //transition effect           
1373   $('#mask').fadeIn(100);       
1374   $('#mask').fadeTo(200,0.8);   
1375   
1376   //Get the window height and width
1377   var winH = $(window).height();
1378   var winW = $(window).width();
1379   
1380   //Set the popup window to center
1381   $('#dialogBox').css('top',  winH/2-$('#dialogBox').height()/2);
1382   $('#dialogBox').css('left', winW/2-$('#dialogBox').width()/2);
1383   
1384   //transition effect
1385   $('#dialogBox').fadeIn(200); 
1386
1387   dialogBox.style.display = "block";
1388 }
1389
1390 function abortDialog(dialog) {
1391   document.getElementById(dialog).style.display = "none";
1392   $('#mask').hide();
1393 }
1394
1395 function removeElement(id) {
1396   var element = document.getElementById(id);
1397   element.parentNode.removeChild(element);
1398
1399
1400 var savedsc;
1401 var savedso;
1402
1403 function getCursorPos() {
1404   var cursorPos;
1405   if (window.getSelection) {
1406     var selObj = window.getSelection();
1407     savedRange = selObj.getRangeAt(0);
1408     savedsc = savedRange.startContainer;
1409     savedso = savedRange.startOffset;
1410     //cursorPos =  findNode(selObj.anchorNode.parentNode.childNodes, selObj.anchorNode) + selObj.anchorOffset;
1411     cursorPos =  findNode(unlocked.childNodes, selObj.anchorNode,0) + selObj.anchorOffset;
1412     /* FIXME the following works wrong in Opera when the document is longer than 32767 chars */
1413     return(cursorPos);
1414   }
1415   else if (document.selection) {
1416     savedRange = document.selection.createRange();
1417     var bookmark = savedRange.getBookmark();
1418     /* FIXME the following works wrong when the document is longer than 65535 chars */
1419     cursorPos = bookmark.charCodeAt(2) - 11; /* Undocumented function [3] */
1420     return(cursorPos);
1421   }
1422 }
1423
1424 function findNode(list, node, acc) {
1425   for (var i = 0; i < list.length; i++) {
1426     if (list[i] == node) {
1427    //   debug("success " + i);
1428       return acc;
1429     }
1430     if (list[i].hasChildNodes()) {
1431        try {
1432    //      debug("recursion on node " + i);
1433          return (findNode(list[i].childNodes,node,acc))
1434        }
1435        catch (e) { /* debug("recursion failed"); */ }
1436     }
1437     sandbox = document.getElementById("sandbox");
1438     dup = list[i].cloneNode(true);
1439     sandbox.appendChild(dup);
1440 //    debug("fail " + i + ": " + sandbox.innerHTML);
1441     acc += sandbox.innerHTML.html_to_matita().length;
1442     sandbox.removeChild(dup);
1443   }
1444   throw "not found";
1445 }
1446
1447 function test () {
1448   debug("cursor test: " + unlocked.innerHTML.substr(0,getCursorPos()));
1449 }
1450
1451 function get_checked_index(name) {
1452         var radios = document.getElementsByName(name);
1453         for (i = 0; i < radios.length; i++) {
1454             if (radios[i].checked) {
1455                     return i;
1456             }
1457         }
1458         return null;
1459 }
1460
1461 function cancel_disambiguate() {
1462         matita.disambMode = false;
1463         resume();
1464         // enable_toparea();
1465         // enable_editing();
1466         strip_tags("span","error");
1467         updateSide();
1468 }
1469
1470 function do_disambiguate() {
1471         var i = get_checked_index("interpr");
1472         if (i != null) {
1473             var pre = matita.unlockedbackup
1474                       .substring(0,matita.ambiguityStart).matita_to_html();
1475             var mid = matita.unlockedbackup
1476                       .substring(matita.ambiguityStart,matita.ambiguityStop)
1477                       .matita_to_html();
1478             var post = matita.unlockedbackup
1479                        .substring(matita.ambiguityStop).matita_to_html();
1480
1481             var href = matita.interpretations[i].href;
1482             var title = matita.interpretations[i].title;
1483
1484             if (is_defined(title)) {
1485                 mid = "<A href=\"" + href + "\" title=\"" + title + "\">" + mid + "</A>";
1486             } else {
1487                 mid = "<A href=\"" + href + "\">" + mid + "</A>";
1488             }
1489
1490             unlocked.innerHTML = pre + mid + post;
1491
1492             matita.disambMode = false;
1493             enable_toparea();
1494             enable_editing();
1495             updateSide();
1496         }
1497 }
1498
1499 function do_showerror() {
1500         var i = get_checked_index("choice");
1501         if (i != null) {
1502             var pre = matita.unlockedbackup
1503                       .substring(0,matita.ambiguityStart).matita_to_html();
1504             var mid = matita.unlockedbackup
1505                       .substring(matita.ambiguityStart,matita.ambiguityStop)
1506                       .matita_to_html();
1507             var post = matita.unlockedbackup
1508                        .substring(matita.ambiguityStop).matita_to_html();
1509
1510             var href = matita.interpretations[i].href;
1511             var title = matita.interpretations[i].title;
1512
1513             if (is_defined(title)) {
1514                 mid = "<A href=\"" + href + "\" title=\"" + title + "\">" + mid + "</A>";
1515             } else {
1516                 mid = "<A href=\"" + href + "\">" + mid + "</A>";
1517             }
1518
1519             unlocked.innerHTML = pre + mid + post;
1520
1521         }
1522 }
1523
1524 function readCookie(name) {
1525         var nameEQ = name + "=";
1526         var ca = document.cookie.split(';');
1527         for(var i=0;i < ca.length;i++) {
1528                 var c = ca[i];
1529                 while (c.charAt(0)==' ') c = c.substring(1,c.length);
1530                 if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
1531         }
1532         return null;
1533 }
1534
1535 function delete_cookie ( cookie_name )
1536 {
1537   var cookie_date = new Date();  // current date & time
1538   cookie_date.setTime ( cookie_date.getTime() - 1 );
1539   document.cookie = cookie_name += "=; expires=" + cookie_date.toGMTString();
1540 }
1541
1542 function delete_session()
1543 {
1544         delete_cookie("session");
1545 }
1546
1547 function disable_toparea() {
1548         var offset = $('#toparea').offset();
1549         $('#whitemask').css('top',offset.top);
1550         $('#whitemask').css('left',offset.left);
1551         $('#whitemask').css('width',$('#toparea').outerWidth() + "px");
1552         $('#whitemask').css('height',$('#toparea').outerHeight() + "px");
1553         $('#whitemask').fadeTo('fast',0.7);
1554 }
1555
1556 function enable_toparea() {
1557         $('#whitemask').hide();
1558 }
1559
1560 function disable_editing() {
1561         unlocked.contentEditable = false;
1562 }
1563
1564 function enable_editing() {
1565         unlocked.contentEditable = true;
1566 }
1567
1568 function pause()
1569 {
1570         // advanceButton.disabled = true;
1571         // retractButton.disabled = true;
1572         // cursorButton.disabled = true;
1573         // bottomButton.disabled = true;
1574         disable_toparea();
1575         disable_editing();
1576 }
1577
1578 function resume()
1579 {
1580         // advanceButton.disabled = false;
1581         // retractButton.disabled = false;
1582         // cursorButton.disabled = false;
1583         // bottomButton.disabled = false;
1584         if (!matita.disambMode) {
1585                 enable_toparea();
1586                 enable_editing();
1587         }
1588 }
1589