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
  19 function initialize()
  20 {
  21   if (readCookie("session") == null) {
  22     window.location = "/login.html"
  23   } else {
  24     locked = document.getElementById("locked");
  25     unlocked = document.getElementById("unlocked");
  26     workarea = document.getElementById("workarea");
  27     scriptcell = document.getElementById("scriptcell");
  28     goalcell = document.getElementById("goalcell");
  29     goals = document.getElementById("goals");
  30     goalview = document.getElementById("goalview");
  31     filename = document.getElementById("filename");
  32     logarea = document.getElementById("logarea");
  33     advanceButton = document.getElementById("advance");
  34     retractButton = document.getElementById("retract");
  35     cursorButton = document.getElementById("cursor");
  36     bottomButton = document.getElementById("bottom");
  37     dialogBox = document.getElementById("dialogBox");
  38     dialogTitle = document.getElementById("dialogTitle");
  39     dialogContent = document.getElementById("dialogContent");
  40
  41     // hide sequent view at start
  42     hideSequent();
  43
  44     // initialize keyboard events in the unlocked script
  45     init_keyboard(unlocked);
  46   }
  47 }
  48
  49 function init_keyboard(target)
  50 {
  51     if (target.addEventListener)
  52     {
  53 //       target.addEventListener("keydown",keydown,false);
  54        target.addEventListener("keypress",keypress,false);
  55 //       target.addEventListener("keyup",keyup,false);
  56 //       target.addEventListener("textInput",textinput,false);
  57     }
  58     else if (target.attachEvent)
  59     {
  60 //       target.attachEvent("onkeydown", keydown);
  61        target.attachEvent("onkeypress", keypress);
  62 //       target.attachEvent("onkeyup", keyup);
  63 //       target.attachEvent("ontextInput", textinput);
  64     }
  65     else
  66     {
  67 //       target.onkeydown= keydown;
  68        target.onkeypress= keypress;
  69 //       target.onkeyup= keyup;
  70 //       target.ontextinput= textinput;   // probably doesn't work
  71     }
  72
  73 }
  74
  75 function keyval(n)
  76 {
  77     if (n == null) return 'undefined';
  78     var s= '' + n;
  79     if (n >= 32 && n < 127) s+= ' (' + String.fromCharCode(n) + ')';
  80     while (s.length < 9) s+= ' ';
  81     return s;
  82 }
  83
  84 function string_of_key(n)
  85 {
  86     if (n == null) return 'undefined';
  87     return String.fromCharCode(n);
  88 }
  89
  90 function pressmesg(w,e)
  91 {
  92    debug(w + '  keyCode=' + keyval(e.keyCode) +
  93                  ' which=' + keyval(e.which) +
  94                  ' charCode=' + keyval(e.charCode) +
  95                  '\n          shiftKey='+e.shiftKey
  96               + ' ctrlKey='+e.ctrlKey
  97               + ' altKey='+e.altKey
  98               + ' metaKey='+e.metaKey);
  99 }
 100
 101 function suppressdefault(e,flag)
 102 {
 103    if (flag)
 104    {
 105        if (e.preventDefault) e.preventDefault();
 106        if (e.stopPropagation) e.stopPropagation();
 107    }
 108    return !flag;
 109 }
 110
 111 function restoreSelection() {
 112     unlocked.focus();
 113     if (savedRange != null) {
 114         if (window.getSelection)//non IE and there is already a selection
 115         {
 116             var s = window.getSelection();
 117             if (s.rangeCount > 0)
 118                 s.removeAllRanges();
 119             s.addRange(savedRange);
 120         }
 121         else
 122             if (document.createRange)//non IE and no selection
 123             {
 124                 window.getSelection().addRange(savedRange);
 125             }
 126             else
 127                 if (document.selection)//IE
 128                 {
 129                     savedRange.select();
 130                 }
 131     }
 132 }
 133
 134 function keypress(e)
 135 {
 136    if (!e) e= event;
 137    pressmesg('keypress',e);
 138    var s = string_of_key(e.charCode);
 139    if (s == " ") {
 140         j = getCursorPos();
 141         i = unlocked.innerHTML.lastIndexOf('\\',j);
 142         if (i >= 0) {
 143           match = unlocked.innerHTML.substring(i,j);
 144           pre = unlocked.innerHTML.substring(0,i);
 145           post = unlocked.innerHTML.substring(j);
 146           if (match == '\\to') {
 147              unlocked.innerHTML = pre + "-> " + post;
 148              restoreSelection();
 149              return suppressdefault(e,true);
 150           }
 151           restoreSelection();
 152           else return suppressdefault(e,false);
 153         }
 154         else return suppressdefault(e,false);
 155    } else {
 156         return suppressdefault(e,false);
 157    }
 158 }
 159
 160 function debug(txt)
 161 {
 162         // internet explorer (v.9) doesn't work with innerHTML
 163         // but google chrome's innerText is, in a sense, "write only"
 164         // what should we do?
 165         logarea.innerText = txt + "\n" + logarea.innerText;
 166 }
 167
 168 function listhd(l)
 169 {
 170         ar = l.split("#");
 171         debug("hd of '" + l + "' = '" + ar[0] + "'");
 172         return (ar[0]);
 173 }
 174
 175 function listtl(l)
 176 {
 177         i = l.indexOf("#");
 178         tl = l.substr(i+1);
 179         debug("tl of '" + l + "' = '" + tl + "'");
 180         return (tl);
 181 }
 182
 183 function listcons(x,l)
 184 {
 185         debug("cons '" + x + "' on '" + l + "'");
 186         return (x + "#" + l);
 187 }
 188
 189 function listnil()
 190 {
 191         return ("");
 192 }
 193
 194 function is_nil(l)
 195 {
 196         return (l == "");
 197 }
 198
 199 function fold_left (f,acc,l)
 200 {
 201         if (is_nil(l))
 202            { debug("'" + l + "' is fold end");
 203            return (acc); }
 204         else
 205            { debug("'" + l + "' is fold cons");
 206              return(fold_left (f,f(acc,(listhd(l))),listtl(l))); }
 207 }
 208
 209 function listiter (f,l)
 210 {
 211         if (is_nil(l))
 212         { debug("'" + l + "' is nil");
 213            return;
 214         }
 215         else
 216         {
 217            debug("'" + l + "' is not nil");
 218            f(listhd(l));
 219            listiter(f,listtl(l));
 220         }
 221 }
 222
 223 function listmap (f,l)
 224 {
 225         debug("listmap on " + l);
 226         if (is_nil(l))
 227            { debug("returning listnil");
 228              return(listnil());
 229            }
 230         else
 231            { debug("cons f(hd) map(f,tl)");
 232              return(f(listhd(l)) + "#" + listmap(f,listtl(l)));
 233            }
 234 }
 235
 236 var statements = listnil();
 237
 238 var goalarray;
 239 var metalist = listnil();
 240
 241 function pairmap (f,p)
 242 {
 243   debug("pairmap of '" + p + "'");
 244   ar = p.split("|");
 245   return (f(ar[0],ar[1]));
 246 }
 247
 248 function tripletmap (f,p)
 249 {
 250   debug("tripletmap of '" + p + "'");
 251   ar = p.split("|");
 252   return (f(ar[0],ar[1],ar[2]));
 253 }
 254
 255 function fst (p)
 256 {
 257   debug("fst");
 258   return (pairmap (function (a,b) { return (a); }, p));
 259 }
 260
 261 function p13 (p)
 262 {
 263   debug("p13");
 264   return (tripletmap (function (a,b,c) { return (a); }, p));
 265 }
 266
 267 function p23 (p)
 268 {
 269   debug("p23");
 270   return (tripletmap (function (a,b,c) { return (b); }, p));
 271 }
 272
 273 function p33 (p)
 274 {
 275   debug("f33");
 276   return (tripletmap (function (a,b,c) { return (c); }, p));
 277 }
 278
 279 function populate_goalarray(menv)
 280 {
 281   debug("metasenv.length = " + menv.length);
 282   if (menv.length == 0) {
 283       try {
 284           hideSequent();
 285       } catch (err) { };
 286   } else {
 287       showSequent();
 288       goalarray = new Array();
 289       metalist = listnil();
 290       var tmp_goallist = "";
 291       for (i = 0; i < menv.length; i++) {
 292         metano = menv[i].getAttribute("number");
 293         metaname = menv[i].childNodes[0].childNodes[0].data;
 294         goal = menv[i].childNodes[1].childNodes[0].data;
 295         debug ("found meta n. " + metano);
 296         debug ("found goal\nBEGIN" + goal + "\nEND");
 297         goalarray[metano] = goal;
 298         tmp_goallist = " <A href=\"javascript:switch_goal(" + metano + ")\">" + metaname + "</A>" + tmp_goallist;
 299         metalist = listcons(metano,metalist);
 300         debug ("goalarray[\"" + metano + "\"] = " + goalarray[metano]);
 301       }
 302       goals.innerHTML = tmp_goallist;
 303       debug("new metalist is '" + metalist + "'");
 304       if (is_nil(metalist)) {
 305         switch_goal();
 306       }
 307       else {
 308         switch_goal(listhd(metalist));
 309       }
 310   }
 311 }
 312
 313 function switch_goal(meta)
 314 {
 315   if (typeof meta == "undefined") {
 316     goalview.innerHTML = "";
 317   }
 318   else {
 319     debug("switch_goal " + meta + "\n" + goalarray[meta]);
 320     goalview.innerHTML = "<B>Goal ?" + meta + ":</B>\n\n" + goalarray[meta];
 321   }
 322 }
 323
 324 String.prototype.sescape = function() {
 325         var patt1 = /%/gi;
 326         var patt2 = /=/gi;
 327         var patt3 = /&/gi;
 328         var patt4 = /\+/gi;
 329         var result = this;
 330         result = result.replace(patt1,"%25");
 331         result = result.replace(patt2,"%3D");
 332         result = result.replace(patt3,"%26");
 333         result = result.replace(patt4,"%2B");
 334         return (result);
 335 }
 336
 337 String.prototype.unescapeHTML = function()
 338 {
 339         var patt1 = /<br(\/|)>/gi;
 340         var patt2 = /&lt;/gi;
 341         var patt3 = /&gt;/gi;
 342         var result = this;
 343         result = result.replace(patt1,"\n");
 344         result = result.replace(patt2,"<");
 345         result = result.replace(patt3,">");
 346         return (unescape(result));
 347 }
 348
 349 function pause()
 350 {
 351         advanceButton.disabled = true;
 352         retractButton.disabled = true;
 353         cursorButton.disabled = true;
 354         bottomButton.disabled = true;
 355 }
 356
 357 function resume()
 358 {
 359         advanceButton.disabled = false;
 360         retractButton.disabled = false;
 361         cursorButton.disabled = false;
 362         bottomButton.disabled = false;
 363 }
 364
 365 function is_defined(x)
 366 {
 367         return (typeof x != "undefined");
 368 }
 369
 370 /* servicename: name of the service being called
 371  * reqbody: text of the request
 372  * processResponse: processes the server response
 373  *     (takes the response text in input, undefined in case of error)
 374  */
 375 function callServer(servicename,processResponse,reqbody)
 376 {
 377         var req = null;
 378         // pause();
 379         if (window.XMLHttpRequest)
 380         {
 381                 req = new XMLHttpRequest();
 382         }
 383         else if (window.ActiveXObject)
 384         {
 385                 try {
 386                                 req = new ActiveXObject("Msxml2.XMLHTTP");
 387                 } catch (e)
 388                 {
 389                         try {
 390                                 req = new ActiveXObject("Microsoft.XMLHTTP");
 391                                 } catch (e) {}
 392                 }
 393         }
 394         req.onreadystatechange = function()
 395         {
 396
 397                 rs = req.readyState;
 398
 399                 if(rs == 4)
 400                 {
 401                         stat = req.status;
 402                         stxt = req.statusText;
 403                         if(stat == 200)
 404                         {
 405                           debug(req.responseText);
 406                           if (window.DOMParser) {
 407                             parser=new DOMParser();
 408                             xmlDoc=parser.parseFromString(req.responseText,"text/xml");
 409                           }
 410                           else // Internet Explorer
 411                           {
 412                             xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
 413                             xmlDoc.async="false";
 414                             xmlDoc.loadXML(req.responseText);
 415                           }
 416                           processResponse(xmlDoc);
 417                         } else {
 418                           processResponse();
 419                         }
 420                 }
 421         };
 422         req.open("POST", servicename); // + escape(unlocked.innerHTML), true);
 423         req.setRequestHeader("Content-type","application/x-www-form-urlencoded");
 424         if (reqbody) {
 425                 req.send(reqbody);
 426         } else {
 427                 req.send();
 428         }
 429
 430 }
 431
 432 function advanceForm1()
 433 {
 434         processor = function(xml) {
 435                 if (is_defined(xml)) {
 436                         // debug("advance: received response\nBEGIN\n" + req.responseText + "\nEND");
 437                         len = parseInt(xml.getElementsByTagName("parsed")[0].getAttribute("length"));
 438                         len0 = unlocked.innerHTML.length;
 439                         unescaped = unlocked.innerHTML.unescapeHTML();
 440                         parsedtxt = unescaped.substr(0,len);
 441                         unparsedtxt = unescaped.substr(len);
 442                         locked.innerHTML = locked.innerHTML + parsedtxt;
 443                         unlocked.innerHTML = unparsedtxt;
 444                         len1 = unlocked.innerHTML.length;
 445                         len2 = len0 - len1;
 446                         metasenv = xml.getElementsByTagName("meta");
 447                         populate_goalarray(metasenv);
 448                         statements = listcons(len2,statements);
 449                         unlocked.scrollIntoView(true);
 450                 } else {
 451                         debug("advance failed");
 452                 }
 453                 resume();
 454         };
 455         pause();
 456         callServer("advance",processor,"body=" + (unlocked.innerHTML.unescapeHTML()).sescape());
 457
 458 }
 459
 460 function gotoBottom()
 461 {
 462         processor = function(xml) {
 463                 if (is_defined(xml)) {
 464                         // debug("goto bottom: received response\nBEGIN\n" + req.responseText + "\nEND");
 465                         len = parseInt(xml.getElementsByTagName("parsed")[0].getAttribute("length"));
 466                         len0 = unlocked.innerHTML.length;
 467                         unescaped = unlocked.innerHTML.unescapeHTML();
 468                         parsedtxt = unescaped.substr(0,len);
 469                         unparsedtxt = unescaped.substr(len);
 470                         locked.innerHTML = locked.innerHTML + parsedtxt;
 471                         unlocked.innerHTML = unparsedtxt;
 472                         len1 = unlocked.innerHTML.length;
 473                         len2 = len0 - len1;
 474                         metasenv = xml.getElementsByTagName("meta");
 475                         populate_goalarray(metasenv);
 476                         statements = listcons(len2,statements);
 477                         unlocked.scrollIntoView(true);
 478                 } else {
 479                         debug("goto bottom failed");
 480                 }
 481                 resume();
 482         };
 483         pause();
 484         callServer("bottom",processor,"body=" + (unlocked.innerHTML.unescapeHTML()).sescape());
 485
 486 }
 487
 488
 489 function gotoPos(offset)
 490 {
 491         if (!is_defined(offset)) {
 492                 offset = getCursorPos();
 493         }
 494         processor = function(xml) {
 495                 if (is_defined(xml)) {
 496                         // debug("goto pos: received response\nBEGIN\n" + req.responseText + "\nEND");
 497                         len = parseInt(xml.getElementsByTagName("parsed")[0].getAttribute("length"));
 498                         len0 = unlocked.innerHTML.length;
 499                         unescaped = unlocked.innerHTML.unescapeHTML();
 500                         parsedtxt = unescaped.substr(0,len);
 501                         unparsedtxt = unescaped.substr(len);
 502                         locked.innerHTML = locked.innerHTML + parsedtxt;
 503                         unlocked.innerHTML = unparsedtxt;
 504                         len1 = unlocked.innerHTML.length;
 505                         len2 = len0 - len1;
 506                         metasenv = xml.getElementsByTagName("meta");
 507                         // populate_goalarray(metasenv);
 508                         statements = listcons(len2,statements);
 509                         unlocked.scrollIntoView(true);
 510                         // la populate non andrebbe fatta a ogni passo
 511                         if (offset <= len) {
 512                                 populate_goalarray(metasenv);
 513                                 resume();
 514                         } else {
 515                                 gotoPos(offset - len);
 516                         }
 517                 } else {
 518                         unlocked.scrollIntoView(true);
 519                         populate_goalarray(metasenv);
 520                         resume();
 521                 }
 522         }
 523         pause();
 524         callServer("advance",processor,"body=" + (unlocked.innerHTML.unescapeHTML()).sescape());
 525 }
 526
 527 function retract()
 528 {
 529         processor = function(xml) {
 530                 if (typeof xml != "undefined") {
 531                         // debug("advance: received response\nBEGIN\n" + req.responseText + "\nEND");
 532                         statementlen = parseInt(listhd(statements));
 533                         statements = listtl(statements);
 534                         lockedlen = locked.innerHTML.length - statementlen;
 535                         statement = locked.innerHTML.substr(lockedlen, statementlen);
 536                         locked.innerHTML = locked.innerHTML.substr(0,lockedlen);
 537                         unlocked.innerHTML = statement + unlocked.innerHTML;
 538                         metasenv = xml.getElementsByTagName("meta");
 539                         populate_goalarray(metasenv);
 540                         unlocked.scrollIntoView(true);
 541                 } else {
 542                         debug("retract failed");
 543                 }
 544                 resume();
 545         };
 546         debug("retract 1");
 547         pause();
 548         callServer("retract",processor);
 549         debug("retract 2");
 550 }
 551
 552 function openFile()
 553 {
 554         processor = function(xml)
 555         {
 556                 if (is_defined(xml)) {
 557                         locked.innerHTML = "";
 558                         unlocked.innerHTML = xml.documentElement.textContent;
 559                 } else {
 560                         debug("file open failed");
 561                 }
 562         };
 563         callServer("open",processor,"file=" + escape(filename.value));
 564 }
 565
 566 function retrieveFile(thefile)
 567 {
 568         processor = function(xml)
 569         {
 570                 if (is_defined(xml)) {
 571                         locked.innerHTML = "";
 572                         unlocked.innerHTML = xml.documentElement.textContent;
 573                 } else {
 574                         debug("file open failed");
 575                 }
 576         };
 577         dialogBox.style.display = "none";
 578         callServer("open",processor,"file=" + escape(thefile));
 579 }
 580
 581 function showLibrary()
 582 {
 583         var req = null;
 584         // pause();
 585         if (window.XMLHttpRequest)
 586         {
 587                 req = new XMLHttpRequest();
 588         }
 589         else if (window.ActiveXObject)
 590         {
 591                 try {
 592                                 req = new ActiveXObject("Msxml2.XMLHTTP");
 593                 } catch (e)
 594                 {
 595                         try {
 596                                 req = new ActiveXObject("Microsoft.XMLHTTP");
 597                                 } catch (e) {}
 598                 }
 599         }
 600         req.onreadystatechange = function()
 601         {
 602
 603                 rs = req.readyState;
 604
 605                 if(rs == 4)
 606                 {
 607                         stat = req.status;
 608                         stxt = req.statusText;
 609                         if(stat == 200)
 610                         {
 611                           debug(req.responseText);
 612                           showDialog("<H2>Library</H2>",req.responseText);
 613                         }
 614                 }
 615         };
 616         req.open("POST", "viewlib"); // + escape(unlocked.innerHTML), true);
 617         req.setRequestHeader("Content-type","application/x-www-form-urlencoded");
 618         req.send();
 619
 620 }
 621
 622 var goalcell;
 623
 624 function hideSequent() {
 625   goalcell.parentNode.removeChild(goalcell);
 626   scriptcell.setAttribute("colspan","2");
 627 }
 628
 629 function showSequent() {
 630   scriptcell.setAttribute("colspan","1");
 631   workarea.appendChild(goalcell);
 632 }
 633
 634 function showDialog(title,content) {
 635   dialogTitle.innerHTML = title;
 636   dialogContent.innerHTML = content;
 637   dialogBox.style.display = "block";
 638 }
 639
 640 function removeElement(id) {
 641   var element = document.getElementById(id);
 642   element.parentNode.removeChild(element);
 643 }
 644
 645 var savedRange;
 646
 647 function getCursorPos() {
 648   var cursorPos;
 649   if (window.getSelection) {
 650     var selObj = window.getSelection();
 651     savedRange = selObj.getRangeAt(0);
 652     //cursorPos =  findNode(selObj.anchorNode.parentNode.childNodes, selObj.anchorNode) + selObj.anchorOffset;
 653     cursorPos =  findNode(unlocked.childNodes, selObj.anchorNode,0) + selObj.anchorOffset;
 654     /* FIXME the following works wrong in Opera when the document is longer than 32767 chars */
 655     return(cursorPos);
 656   }
 657   else if (document.selection) {
 658     savedRange = document.selection.createRange();
 659     var bookmark = savedRange.getBookmark();
 660     /* FIXME the following works wrong when the document is longer than 65535 chars */
 661     cursorPos = bookmark.charCodeAt(2) - 11; /* Undocumented function [3] */
 662     return(cursorPos);
 663   }
 664 }
 665
 666 function findNode(list, node, acc) {
 667   for (var i = 0; i < list.length; i++) {
 668     if (list[i] == node) {
 669    //   debug("success " + i);
 670       return acc;
 671     }
 672     if (list[i].hasChildNodes()) {
 673        try {
 674    //      debug("recursion on node " + i);
 675          return (findNode(list[i].childNodes,node,acc))
 676        }
 677        catch (e) { /* debug("recursion failed"); */ }
 678     }
 679     sandbox = document.getElementById("sandbox");
 680     dup = list[i].cloneNode(true);
 681     sandbox.appendChild(dup);
 682 //    debug("fail " + i + ": " + sandbox.innerHTML);
 683     acc += sandbox.innerHTML.length;
 684     sandbox.removeChild(dup);
 685   }
 686   throw "not found";
 687 }
 688
 689 function test () {
 690   debug("cursor test: " + unlocked.innerHTML.substr(0,getCursorPos()));
 691 }
 692
 693 function readCookie(name) {
 694         var nameEQ = name + "=";
 695         var ca = document.cookie.split(';');
 696         for(var i=0;i < ca.length;i++) {
 697                 var c = ca[i];
 698                 while (c.charAt(0)==' ') c = c.substring(1,c.length);
 699                 if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
 700         }
 701         return null;
 702 }
 703
 704 function delete_cookie ( cookie_name )
 705 {
 706   var cookie_date = new Date();  // current date & time
 707   cookie_date.setTime ( cookie_date.getTime() - 1 );
 708   document.cookie = cookie_name += "=; expires=" + cookie_date.toGMTString();
 709 }
 710
 711 function delete_session()
 712 {
 713         delete_cookie("session");
 714 }