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annotate lib/js/urweb.js @ 902:4b9f1de2c647

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dlist add and delete both working in Iceape and Konqueror
author Adam Chlipala <adamc@hcoop.net>
date Thu, 06 Aug 2009 14:39:03 -0400
parents f17638dd3080
children 63114a2e5075
rev   line source
adamc@692 1 // Lists
adamc@692 2
adamc@580 3 function cons(v, ls) {
adamc@690 4 return { next : ls, data : v };
adamc@690 5 }
adamc@690 6 function concat(ls1, ls2) {
adamc@690 7 return (ls1 ? cons(ls1.data, concat(ls1.next, ls2)) : ls2);
adamc@690 8 }
adamc@690 9 function member(x, ls) {
adamc@690 10 for (; ls; ls = ls.next)
adamc@690 11 if (ls.data == x)
adamc@690 12 return true;
adamc@690 13 return false;
adamc@690 14 }
adamc@690 15 function remove(x, ls) {
adamc@690 16 return (ls ? (ls.data == x ? ls.next : cons(ls.data, remove(x, ls.next))) : null);
adamc@690 17 }
adamc@690 18 function union(ls1, ls2) {
adamc@690 19 return (ls1 ? (member(ls1.data, ls2) ? union(ls1.next, ls2) : cons(ls1.data, union(ls1.next, ls2))) : ls2);
adamc@580 20 }
adamc@703 21 function length(ls) {
adamc@703 22 return (ls ? 1 + length(ls.next) : 0);
adamc@703 23 }
adamc@670 24
adamc@690 25
adamc@729 26 // Error handling
adamc@729 27
adamc@729 28 function whine(msg) {
adamc@729 29 alert(msg);
adamc@729 30 throw msg;
adamc@729 31 }
adamc@729 32
adamc@810 33 function pf(loc) {
adamc@835 34 throw ("Pattern match failure (" + loc + ")");
adamc@729 35 }
adamc@729 36
adamc@798 37 function runHandlers(kind, ls, arg) {
adamc@798 38 if (ls == null)
adamc@798 39 alert(kind + ": " + arg);
adamc@729 40 for (; ls; ls = ls.next)
adamc@729 41 try {
adamc@729 42 ls.data(arg)(null);
adamc@729 43 } catch (v) { }
adamc@729 44 }
adamc@729 45
adamc@729 46 var errorHandlers = null;
adamc@729 47
adamc@729 48 function onError(f) {
adamc@729 49 errorHandlers = cons(f, errorHandlers);
adamc@729 50 }
adamc@729 51
adamc@729 52 function er(s) {
adamc@798 53 runHandlers("Error", errorHandlers, s);
adamc@729 54 throw {uw_error: s};
adamc@729 55 }
adamc@729 56
adamc@729 57 var failHandlers = null;
adamc@729 58
adamc@729 59 function onFail(f) {
adamc@729 60 failHandlers = cons(f, failHandlers);
adamc@729 61 }
adamc@729 62
adamc@729 63 function doExn(v) {
adamc@729 64 if (v == null || v.uw_error == null) {
adamc@729 65 var s = (v == null ? "null" : v.toString());
adamc@798 66 runHandlers("Fail", failHandlers, s);
adamc@729 67 }
adamc@729 68 }
adamc@729 69
adamc@729 70 var disconnectHandlers = null;
adamc@729 71
adamc@729 72 function onDisconnect(f) {
adamc@729 73 disconnectHandlers = cons(function (_){return f}, disconnectHandlers);
adamc@729 74 }
adamc@729 75
adamc@729 76 function discon() {
adamc@798 77 runHandlers("Disconnect", disconnectHandlers, null);
adamc@729 78 }
adamc@729 79
adamc@729 80 var connectHandlers = null;
adamc@729 81
adamc@729 82 function onConnectFail(f) {
adamc@729 83 connectHandlers = cons(function (_){return f}, connectHandlers);
adamc@729 84 }
adamc@729 85
adamc@729 86 function conn() {
adamc@798 87 runHandlers("Connect", connectHandlers, null);
adamc@729 88 }
adamc@729 89
adamc@729 90 var serverHandlers = null;
adamc@729 91
adamc@729 92 function onServerError(f) {
adamc@729 93 serverHandlers = cons(f, serverHandlers);
adamc@729 94 }
adamc@729 95
adamc@729 96 function servErr(s) {
adamc@824 97 window.setTimeout(function () { runHandlers("Server", serverHandlers, s); }, 0);
adamc@729 98 }
adamc@729 99
adamc@729 100
adamc@692 101 // Embedding closures in XML strings
adamc@692 102
adamc@693 103 function cs(f) {
adamc@693 104 return {closure: f};
adamc@693 105 }
adamc@693 106
adamc@693 107 function isWeird(v) {
adamc@693 108 return v.closure != null || v.cat1 != null;
adamc@693 109 }
adamc@693 110
adamc@692 111 function cat(s1, s2) {
adamc@693 112 if (isWeird(s1) || isWeird(s2))
adamc@693 113 return {cat1: s1, cat2: s2};
adamc@693 114 else
adamc@692 115 return s1 + s2;
adamc@692 116 }
adamc@692 117
adamc@692 118 var closures = [];
adamc@703 119 var freeClosures = null;
adamc@692 120
adamc@692 121 function newClosure(f) {
adamc@703 122 var n;
adamc@703 123 if (freeClosures == null) {
adamc@703 124 n = closures.length;
adamc@703 125 } else {
adamc@703 126 n = freeClosures.data;
adamc@703 127 freeClosures = freeClosures.next;
adamc@703 128 }
adamc@692 129 closures[n] = f;
adamc@692 130 return n;
adamc@692 131 }
adamc@692 132
adamc@703 133 function freeClosure(n) {
adamc@703 134 closures[n] = null;
adamc@703 135 freeClosures = cons(n, freeClosures);
adamc@703 136 }
adamc@703 137
adamc@692 138 function cr(n) {
adamc@692 139 return closures[n]();
adamc@692 140 }
adamc@692 141
adamc@703 142 function flatten(cls, tr) {
adamc@693 143 if (tr.cat1 != null)
adamc@703 144 return flatten(cls, tr.cat1) + flatten(cls, tr.cat2);
adamc@703 145 else if (tr.closure != null) {
adamc@703 146 var cl = newClosure(tr.closure);
adamc@703 147 cls.v = cons(cl, cls.v);
adamc@703 148 return "cr(" + cl + ")";
adamc@703 149 } else
adamc@692 150 return tr;
adamc@692 151 }
adamc@692 152
adamc@728 153 function flattenLocal(s) {
adamc@728 154 var cls = {v : null};
adamc@728 155 var r = flatten(cls, s);
adamc@728 156 for (cl = cls.v; cl != null; cl = cl.next)
adamc@728 157 freeClosure(cl.data);
adamc@728 158 return r;
adamc@728 159 }
adamc@728 160
adamc@692 161
adamc@692 162
adamc@692 163 // Dynamic tree management
adamc@692 164
adamc@690 165 function populate(node) {
adamc@690 166 var s = node.signal;
adamc@690 167 var oldSources = node.sources;
adamc@729 168 try {
adamc@729 169 var sr = s();
adamc@729 170 var newSources = sr.sources;
adamc@690 171
adamc@729 172 for (var sp = oldSources; sp; sp = sp.next)
adamc@729 173 if (!member(sp.data, newSources))
adamc@729 174 sp.data.dyns = remove(node, sp.data.dyns);
adamc@690 175
adamc@729 176 for (var sp = newSources; sp; sp = sp.next)
adamc@729 177 if (!member(sp.data, oldSources))
adamc@729 178 sp.data.dyns = cons(node, sp.data.dyns);
adamc@690 179
adamc@729 180 node.sources = newSources;
adamc@729 181 node.recreate(sr.data);
adamc@729 182 } catch (v) {
adamc@729 183 doExn(v);
adamc@729 184 }
adamc@579 185 }
adamc@574 186
adamc@580 187 function sc(v) {
adamc@690 188 return {data : v, dyns : null};
adamc@580 189 }
adamc@580 190 function sv(s, v) {
adamc@690 191 s.data = v;
adamc@690 192 for (var ls = s.dyns; ls; ls = ls.next)
adamc@690 193 if (!ls.dead)
adamc@690 194 populate(ls.data);
adamc@580 195 }
adamc@601 196 function sg(s) {
adamc@690 197 return s.data;
adamc@601 198 }
adamc@579 199
adamc@580 200 function ss(s) {
adamc@690 201 return function() { return {sources : cons(s, null), data : s.data } };
adamc@580 202 }
adamc@580 203 function sr(v) {
adamc@690 204 return function() { return {sources : null, data : v } };
adamc@580 205 }
adamc@580 206 function sb(x,y) {
adamc@690 207 return function() {
adamc@690 208 var xr = x();
adamc@690 209 var yr = y(xr.data)();
adamc@690 210 return {sources : union(xr.sources, yr.sources), data : yr.data};
adamc@690 211 };
adamc@580 212 }
adamc@841 213 function scur(s) {
adamc@841 214 return s().data;
adamc@841 215 }
adamc@571 216
adamc@604 217 function lastParent() {
adamc@604 218 var pos = document;
adamc@604 219
adamc@600 220 while (pos.lastChild && pos.lastChild.nodeType == 1)
adamc@600 221 pos = pos.lastChild;
adamc@600 222
adamc@600 223 return pos.parentNode;
adamc@600 224 }
adamc@600 225
adamc@898 226 function parent() {
adamc@898 227 return thisScript ? thisScript.parentNode : lastParent();
adamc@898 228 }
adamc@898 229
adamc@604 230 function addNode(node) {
adamc@899 231 if (thisScript)
adamc@899 232 thisScript.parentNode.replaceChild(node, thisScript);
adamc@899 233 else
adamc@604 234 lastParent().appendChild(node);
adamc@603 235 }
adamc@603 236
adamc@690 237 var thisScript = null;
adamc@690 238
adamc@604 239 function runScripts(node) {
adamc@899 240 if (node.getElementsByTagName) {
adamc@899 241 var savedScript = thisScript;
adamc@603 242
adamc@899 243 var scripts = node.getElementsByTagName("script"), scriptsCopy = [];
adamc@899 244 var len = scripts.length;
adamc@899 245 for (var i = 0; i < len; ++i)
adamc@899 246 scriptsCopy[i] = scripts[i];
adamc@899 247 for (var i = 0; i < len; ++i) {
adamc@899 248 thisScript = scriptsCopy[i];
adamc@899 249 try {
adamc@899 250 eval(thisScript.textContent);
adamc@899 251 } catch (v) {
adamc@899 252 doExn(v);
adamc@899 253 }
adamc@899 254 if (thisScript.parentNode)
adamc@901 255 thisScript.parentNode.removeChild(thisScript);
adamc@729 256 }
adamc@899 257
adamc@899 258 thisScript = savedScript;
adamc@604 259 }
adamc@603 260 }
adamc@603 261
adamc@603 262
adamc@692 263 // Dynamic tree entry points
adamc@692 264
adamc@901 265 function dyn(pnode, s) {
adamc@901 266 var x = document.createElement("script");
adamc@690 267 x.dead = false;
adamc@690 268 x.signal = s;
adamc@690 269 x.sources = null;
adamc@703 270 x.closures = null;
adamc@899 271
adamc@902 272 var firstChild = null;
adamc@899 273
adamc@690 274 x.recreate = function(v) {
adamc@703 275 for (var ls = x.closures; ls; ls = ls.next)
adamc@703 276 freeClosure(ls.data);
adamc@692 277
adamc@902 278 var next;
adamc@902 279 for (var child = firstChild; child && child != x; child = next) {
adamc@902 280 next = child.nextSibling;
adamc@901 281 if (child.getElementsByTagName) {
adamc@901 282 var arr = child.getElementsByTagName("script");
adamc@899 283 for (var i = 0; i < arr.length; ++i) {
adamc@899 284 var span = arr[i];
adamc@899 285 span.dead = true;
adamc@899 286 for (var ls = span.sources; ls; ls = ls.next)
adamc@899 287 ls.data.dyns = remove(span, ls.data.dyns);
adamc@899 288 for (var ls = span.closures; ls; ls = ls.next)
adamc@899 289 freeClosure(ls.data);
adamc@899 290 }
adamc@847 291 }
adamc@847 292
adamc@901 293 if (child.parentNode)
adamc@901 294 child.parentNode.removeChild(child);
adamc@899 295 }
adamc@690 296
adamc@703 297 var cls = {v : null};
adamc@901 298 var html = flatten(cls, v);
adamc@703 299 x.closures = cls.v;
adamc@899 300
adamc@901 301 if (pnode == "table") {
adamc@901 302 var dummy = document.createElement("body");
adamc@901 303 dummy.innerHTML = "<table>" + html + "</table>";
adamc@901 304 runScripts(dummy);
adamc@901 305 var rows = dummy.firstChild.rows;
adamc@901 306 var nRows = rows.length;
adamc@901 307 var table = x.parentNode;
adamc@901 308
adamc@901 309 var arr = dummy.getElementsByTagName("tbody");
adamc@902 310 firstChild = null;
adamc@901 311 if (arr.length > 0) {
adamc@901 312 var tbody = arr[0], next;
adamc@902 313 firstChild = document.createElement("script");
adamc@902 314 table.insertBefore(firstChild, x);
adamc@901 315 for (var node = tbody.firstChild; node; node = next) {
adamc@901 316 next = node.nextSibling;
adamc@902 317 table.insertBefore(node, x);
adamc@901 318 }
adamc@901 319 }
adamc@901 320 } else {
adamc@902 321 firstChild = document.createElement("span");
adamc@902 322 firstChild.innerHTML = html;
adamc@902 323 runScripts(firstChild);
adamc@900 324 if (x.parentNode)
adamc@902 325 x.parentNode.insertBefore(firstChild, x);
adamc@899 326 }
adamc@690 327 };
adamc@899 328
adamc@899 329 addNode(x);
adamc@690 330 populate(x);
adamc@571 331 }
adamc@582 332
adamc@817 333 function input(t, s, recreate) {
adamc@598 334 var x = document.createElement(t);
adamc@690 335 x.dead = false;
adamc@690 336 x.signal = ss(s);
adamc@690 337 x.sources = null;
adamc@817 338 x.recreate = recreate(x);
adamc@899 339 addNode(x);
adamc@690 340 populate(x);
adamc@816 341
adamc@816 342 return x;
adamc@816 343 }
adamc@816 344
adamc@816 345 function inp(s) {
adamc@817 346 var x = input("input", s, function(x) { return function(v) { if (x.value != v) x.value = v; }; });
adamc@816 347 x.value = s.data;
adamc@816 348 x.onkeyup = function() { sv(s, x.value) };
adamc@816 349
adamc@816 350 return x;
adamc@816 351 }
adamc@816 352
adamc@816 353 function sel(s, content) {
adamc@817 354 var x = input("select", s, function(x) { return function(v) { if (x.value != v) x.value = v; }; });
adamc@816 355 x.innerHTML = content;
adamc@816 356 x.value = s.data;
adamc@835 357 if (x.value != s.data)
adamc@835 358 sv(s, x.value);
adamc@816 359 x.onchange = function() { sv(s, x.value) };
adamc@797 360
adamc@606 361 return x;
adamc@598 362 }
adamc@598 363
adamc@817 364 function chk(s) {
adamc@817 365 var x = input("input", s, function(x) { return function(v) { if (x.checked != v) x.checked = v; }; });
adamc@817 366 x.type = "checkbox";
adamc@817 367 x.checked = s.data;
adamc@817 368 x.onchange = function() { sv(s, x.checked) };
adamc@817 369
adamc@817 370 return x;
adamc@817 371 }
adamc@817 372
adamc@800 373 function addOnChange(x, f) {
adamc@800 374 var old = x.onchange;
adamc@800 375 x.onchange = function() { old(); f (); };
adamc@800 376 }
adamc@800 377
adamc@692 378
adamc@692 379 // Basic string operations
adamc@692 380
adamc@597 381 function eh(x) {
adamc@800 382 if (x == null)
adamc@800 383 return "NULL";
adamc@800 384 else
adamc@800 385 return x.split("&").join("&amp;").split("<").join("&lt;").split(">").join("&gt;");
adamc@597 386 }
adamc@597 387
adamc@582 388 function ts(x) { return x.toString() }
adamc@586 389 function bs(b) { return (b ? "True" : "False") }
adamc@586 390
adamc@828 391 function sub(s, i) { return s[i]; }
adamc@828 392 function suf(s, i) { return s.substring(i); }
adamc@828 393 function slen(s) { return s.length; }
adamc@829 394 function sidx(s, ch) {
adamc@829 395 var r = s.indexOf(ch);
adamc@829 396 if (r == -1)
adamc@829 397 return null;
adamc@829 398 else
adamc@829 399 return r;
adamc@829 400 }
adamc@831 401 function sspn(s, chs) {
adamc@831 402 for (var i = 0; i < s.length; ++i)
adamc@831 403 if (chs.indexOf(s[i]) != -1)
adamc@831 404 return i;
adamc@831 405
adamc@831 406 return null;
adamc@831 407 }
adamc@829 408 function schr(s, ch) {
adamc@829 409 var r = s.indexOf(ch);
adamc@829 410 if (r == -1)
adamc@829 411 return null;
adamc@829 412 else
adamc@829 413 return s.substring(r);
adamc@829 414 }
adamc@829 415 function ssub(s, start, len) {
adamc@829 416 return s.substring(start, start+len);
adamc@829 417 }
adamc@821 418
adamc@649 419 function pi(s) {
adamc@649 420 var r = parseInt(s);
adamc@649 421 if (r.toString() == s)
adamc@649 422 return r;
adamc@649 423 else
adamc@729 424 er("Can't parse int: " + s);
adamc@649 425 }
adamc@649 426
adamc@649 427 function pfl(s) {
adamc@649 428 var r = parseFloat(s);
adamc@649 429 if (r.toString() == s)
adamc@649 430 return r;
adamc@649 431 else
adamc@729 432 er("Can't parse float: " + s);
adamc@649 433 }
adamc@649 434
adamc@838 435 function pio(s) {
adamc@838 436 var r = parseInt(s);
adamc@838 437 if (r.toString() == s)
adamc@838 438 return r;
adamc@838 439 else
adamc@838 440 return null;
adamc@838 441 }
adamc@838 442
adamc@838 443 function pflo(s) {
adamc@838 444 var r = parseFloat(s);
adamc@838 445 if (r.toString() == s)
adamc@838 446 return r;
adamc@838 447 else
adamc@838 448 return null;
adamc@838 449 }
adamc@838 450
adamc@692 451 function uf(s) {
adamc@889 452 return escape(s).replace(new RegExp ("/", "g"), "%2F").replace(new RegExp ("\\+", "g"), "%2B");
adamc@691 453 }
adamc@691 454
adamc@692 455 function uu(s) {
adamc@889 456 return unescape(s);
adamc@692 457 }
adamc@692 458
adamc@692 459
adamc@603 460
adamc@692 461 // Remote calls
adamc@609 462
adamc@703 463 var client_id = null;
adamc@668 464 var client_pass = 0;
adamc@668 465 var url_prefix = "/";
adamc@673 466 var timeout = 60;
adamc@668 467
adamc@668 468 function getXHR(uri)
adamc@609 469 {
adamc@609 470 try {
adamc@609 471 return new XMLHttpRequest();
adamc@609 472 } catch (e) {
adamc@609 473 try {
adamc@609 474 return new ActiveXObject("Msxml2.XMLHTTP");
adamc@609 475 } catch (e) {
adamc@609 476 try {
adamc@609 477 return new ActiveXObject("Microsoft.XMLHTTP");
adamc@609 478 } catch (e) {
adamc@609 479 throw "Your browser doesn't seem to support AJAX.";
adamc@609 480 }
adamc@609 481 }
adamc@609 482 }
adamc@609 483 }
adamc@609 484
adamc@736 485 var sig = null;
adamc@736 486
adamc@736 487 function requestUri(xhr, uri, needsSig) {
adamc@668 488 xhr.open("GET", uri, true);
adamc@668 489
adamc@703 490 if (client_id != null) {
adamc@668 491 xhr.setRequestHeader("UrWeb-Client", client_id.toString());
adamc@668 492 xhr.setRequestHeader("UrWeb-Pass", client_pass.toString());
adamc@668 493 }
adamc@668 494
adamc@736 495 if (needsSig) {
adamc@736 496 if (sig == null)
adamc@736 497 whine("Missing cookie signature!");
adamc@736 498
adamc@736 499 xhr.setRequestHeader("UrWeb-Sig", sig);
adamc@736 500 }
adamc@736 501
adamc@668 502 xhr.send(null);
adamc@668 503 }
adamc@668 504
adamc@736 505 function rc(uri, parse, k, needsSig) {
adamc@728 506 uri = flattenLocal(uri);
adamc@609 507 var xhr = getXHR();
adamc@609 508
adamc@609 509 xhr.onreadystatechange = function() {
adamc@612 510 if (xhr.readyState == 4) {
adamc@612 511 var isok = false;
adamc@612 512
adamc@612 513 try {
adamc@612 514 if (xhr.status == 200)
adamc@612 515 isok = true;
adamc@612 516 } catch (e) { }
adamc@612 517
adamc@729 518 if (isok) {
adamc@729 519 try {
adamc@729 520 k(parse(xhr.responseText));
adamc@729 521 } catch (v) {
adamc@729 522 doExn(v);
adamc@729 523 }
adamc@729 524 } else {
adamc@729 525 conn();
adamc@649 526 }
adamc@612 527 }
adamc@609 528 };
adamc@609 529
adamc@736 530 requestUri(xhr, uri, needsSig);
adamc@609 531 }
adamc@667 532
adamc@667 533 function path_join(s1, s2) {
adamc@667 534 if (s1.length > 0 && s1[s1.length-1] == '/')
adamc@667 535 return s1 + s2;
adamc@667 536 else
adamc@667 537 return s1 + "/" + s2;
adamc@667 538 }
adamc@667 539
adamc@670 540 var channels = [];
adamc@670 541
adamc@670 542 function newQueue() {
adamc@670 543 return { front : null, back : null };
adamc@670 544 }
adamc@670 545 function enqueue(q, v) {
adamc@670 546 if (q.front == null) {
adamc@670 547 q.front = cons(v, null);
adamc@670 548 q.back = q.front;
adamc@670 549 } else {
adamc@670 550 var node = cons(v, null);
adamc@690 551 q.back.next = node;
adamc@670 552 q.back = node;
adamc@670 553 }
adamc@670 554 }
adamc@670 555 function dequeue(q) {
adamc@670 556 if (q.front == null)
adamc@670 557 return null;
adamc@670 558 else {
adamc@690 559 var r = q.front.data;
adamc@690 560 q.front = q.front.next;
adamc@670 561 if (q.front == null)
adamc@670 562 q.back = null;
adamc@670 563 return r;
adamc@670 564 }
adamc@670 565 }
adamc@670 566
adamc@670 567 function newChannel() {
adamc@670 568 return { msgs : newQueue(), listeners : newQueue() };
adamc@670 569 }
adamc@670 570
adamc@667 571 function listener() {
adamc@668 572 var uri = path_join(url_prefix, ".msgs");
adamc@667 573 var xhr = getXHR();
adamc@673 574 var tid, orsc, onTimeout;
adamc@673 575
adamc@673 576 var connect = function () {
adamc@673 577 xhr.onreadystatechange = orsc;
adamc@673 578 tid = window.setTimeout(onTimeout, timeout * 500);
adamc@736 579 requestUri(xhr, uri, false);
adamc@673 580 }
adamc@673 581
adamc@673 582 orsc = function() {
adamc@667 583 if (xhr.readyState == 4) {
adamc@673 584 window.clearTimeout(tid);
adamc@673 585
adamc@667 586 var isok = false;
adamc@667 587
adamc@667 588 try {
adamc@667 589 if (xhr.status == 200)
adamc@667 590 isok = true;
adamc@667 591 } catch (e) { }
adamc@667 592
adamc@668 593 if (isok) {
adamc@889 594 var text = xhr.responseText
adamc@889 595 if (text == "")
adamc@889 596 return;
adamc@889 597 var lines = text.split("\n");
adamc@889 598
adamc@729 599 if (lines.length < 2) {
adamc@729 600 discon();
adamc@729 601 return;
adamc@729 602 }
adamc@669 603
adamc@669 604 for (var i = 0; i+1 < lines.length; i += 2) {
adamc@670 605 var chn = lines[i];
adamc@670 606 var msg = lines[i+1];
adamc@670 607
adamc@670 608 if (chn < 0)
adamc@670 609 whine("Out-of-bounds channel in message from remote server");
adamc@670 610
adamc@670 611 var ch;
adamc@670 612
adamc@670 613 if (chn >= channels.length || channels[chn] == null) {
adamc@670 614 ch = newChannel();
adamc@670 615 channels[chn] = ch;
adamc@670 616 } else
adamc@670 617 ch = channels[chn];
adamc@670 618
adamc@670 619 var listener = dequeue(ch.listeners);
adamc@670 620 if (listener == null) {
adamc@670 621 enqueue(ch.msgs, msg);
adamc@670 622 } else {
adamc@728 623 try {
adamc@728 624 listener(msg);
adamc@728 625 } catch (v) {
adamc@728 626 doExn(v);
adamc@728 627 }
adamc@670 628 }
adamc@669 629 }
adamc@669 630
adamc@673 631 connect();
adamc@668 632 }
adamc@667 633 else {
adamc@729 634 try {
adamc@824 635 if (xhr.status != 0)
adamc@824 636 servErr("Error querying remote server for messages: " + xhr.status);
adamc@889 637 } catch (e) { }
adamc@667 638 }
adamc@667 639 }
adamc@667 640 };
adamc@667 641
adamc@673 642 onTimeout = function() {
adamc@673 643 xhr.abort();
adamc@673 644 connect();
adamc@673 645 };
adamc@673 646
adamc@673 647 connect();
adamc@667 648 }
adamc@670 649
adamc@670 650 function rv(chn, parse, k) {
adamc@682 651 if (chn == null)
adamc@682 652 return;
adamc@682 653
adamc@670 654 if (chn < 0)
adamc@670 655 whine("Out-of-bounds channel receive");
adamc@670 656
adamc@670 657 var ch;
adamc@670 658
adamc@670 659 if (chn >= channels.length || channels[chn] == null) {
adamc@670 660 ch = newChannel();
adamc@670 661 channels[chn] = ch;
adamc@670 662 } else
adamc@670 663 ch = channels[chn];
adamc@670 664
adamc@670 665 var msg = dequeue(ch.msgs);
adamc@670 666 if (msg == null) {
adamc@670 667 enqueue(ch.listeners, function(msg) { k(parse(msg))(null); });
adamc@670 668 } else {
adamc@728 669 try {
adamc@728 670 k(parse(msg))(null);
adamc@728 671 } catch (v) {
adamc@728 672 doExn(v);
adamc@728 673 }
adamc@670 674 }
adamc@670 675 }
adamc@693 676
adamc@693 677
adamc@895 678 // Key events
adamc@895 679
adamc@895 680 function kc(e) {
adamc@895 681 return window.event ? e.keyCode : e.which;
adamc@895 682 }
adamc@895 683
adamc@895 684
adamc@693 685 // App-specific code
adamc@693 686