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annotate lib/js/urweb.js @ 899:25a038a9194b

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dtable example and demos both working
author Adam Chlipala <adamc@hcoop.net>
date Thu, 06 Aug 2009 11:54:28 -0400
parents d1d0b18afd3d
children ed381288ce9a
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@899 255 thisScripts.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@571 265 function dyn(s) {
adamc@899 266 var x = document.createElement("div");
adamc@899 267 x.style.display = "inline";
adamc@690 268 x.dead = false;
adamc@690 269 x.signal = s;
adamc@690 270 x.sources = null;
adamc@703 271 x.closures = null;
adamc@899 272
adamc@899 273 var first = null;
adamc@899 274
adamc@690 275 x.recreate = function(v) {
adamc@703 276 for (var ls = x.closures; ls; ls = ls.next)
adamc@703 277 freeClosure(ls.data);
adamc@692 278
adamc@899 279 for (var node = first; node && node != x; ) {
adamc@899 280 if (node.getElementsByTagName) {
adamc@899 281 var arr = node.getElementsByTagName("div");
adamc@899 282 for (var i = 0; i < arr.length; ++i) {
adamc@899 283 var span = arr[i];
adamc@899 284 span.dead = true;
adamc@899 285 for (var ls = span.sources; ls; ls = ls.next)
adamc@899 286 ls.data.dyns = remove(span, ls.data.dyns);
adamc@899 287 for (var ls = span.closures; ls; ls = ls.next)
adamc@899 288 freeClosure(ls.data);
adamc@899 289 }
adamc@847 290 }
adamc@847 291
adamc@899 292 var old = node;
adamc@899 293 node = node.nextSibling;
adamc@899 294 old.parentNode.removeChild(old);
adamc@899 295 }
adamc@690 296
adamc@703 297 var cls = {v : null};
adamc@899 298 var dummy = document.createElement("table");
adamc@899 299 dummy.innerHTML = flatten(cls, v);
adamc@703 300 x.closures = cls.v;
adamc@899 301 runScripts(dummy);
adamc@899 302
adamc@899 303 for (first = dummy.firstChild; first && first.tagName == "TBODY"; first = first.firstChild);
adamc@899 304 for (var node = first; node; ) {
adamc@899 305 var old = node;
adamc@899 306 node = node.nextSibling;
adamc@899 307 x.parentNode.insertBefore(old, x);
adamc@899 308 }
adamc@690 309 };
adamc@899 310
adamc@899 311 addNode(x);
adamc@690 312 populate(x);
adamc@571 313 }
adamc@582 314
adamc@817 315 function input(t, s, recreate) {
adamc@598 316 var x = document.createElement(t);
adamc@690 317 x.dead = false;
adamc@690 318 x.signal = ss(s);
adamc@690 319 x.sources = null;
adamc@817 320 x.recreate = recreate(x);
adamc@899 321 addNode(x);
adamc@690 322 populate(x);
adamc@816 323
adamc@816 324 return x;
adamc@816 325 }
adamc@816 326
adamc@816 327 function inp(s) {
adamc@817 328 var x = input("input", s, function(x) { return function(v) { if (x.value != v) x.value = v; }; });
adamc@816 329 x.value = s.data;
adamc@816 330 x.onkeyup = function() { sv(s, x.value) };
adamc@816 331
adamc@816 332 return x;
adamc@816 333 }
adamc@816 334
adamc@816 335 function sel(s, content) {
adamc@817 336 var x = input("select", s, function(x) { return function(v) { if (x.value != v) x.value = v; }; });
adamc@816 337 x.innerHTML = content;
adamc@816 338 x.value = s.data;
adamc@835 339 if (x.value != s.data)
adamc@835 340 sv(s, x.value);
adamc@816 341 x.onchange = function() { sv(s, x.value) };
adamc@797 342
adamc@606 343 return x;
adamc@598 344 }
adamc@598 345
adamc@817 346 function chk(s) {
adamc@817 347 var x = input("input", s, function(x) { return function(v) { if (x.checked != v) x.checked = v; }; });
adamc@817 348 x.type = "checkbox";
adamc@817 349 x.checked = s.data;
adamc@817 350 x.onchange = function() { sv(s, x.checked) };
adamc@817 351
adamc@817 352 return x;
adamc@817 353 }
adamc@817 354
adamc@800 355 function addOnChange(x, f) {
adamc@800 356 var old = x.onchange;
adamc@800 357 x.onchange = function() { old(); f (); };
adamc@800 358 }
adamc@800 359
adamc@692 360
adamc@692 361 // Basic string operations
adamc@692 362
adamc@597 363 function eh(x) {
adamc@800 364 if (x == null)
adamc@800 365 return "NULL";
adamc@800 366 else
adamc@800 367 return x.split("&").join("&amp;").split("<").join("&lt;").split(">").join("&gt;");
adamc@597 368 }
adamc@597 369
adamc@582 370 function ts(x) { return x.toString() }
adamc@586 371 function bs(b) { return (b ? "True" : "False") }
adamc@586 372
adamc@828 373 function sub(s, i) { return s[i]; }
adamc@828 374 function suf(s, i) { return s.substring(i); }
adamc@828 375 function slen(s) { return s.length; }
adamc@829 376 function sidx(s, ch) {
adamc@829 377 var r = s.indexOf(ch);
adamc@829 378 if (r == -1)
adamc@829 379 return null;
adamc@829 380 else
adamc@829 381 return r;
adamc@829 382 }
adamc@831 383 function sspn(s, chs) {
adamc@831 384 for (var i = 0; i < s.length; ++i)
adamc@831 385 if (chs.indexOf(s[i]) != -1)
adamc@831 386 return i;
adamc@831 387
adamc@831 388 return null;
adamc@831 389 }
adamc@829 390 function schr(s, ch) {
adamc@829 391 var r = s.indexOf(ch);
adamc@829 392 if (r == -1)
adamc@829 393 return null;
adamc@829 394 else
adamc@829 395 return s.substring(r);
adamc@829 396 }
adamc@829 397 function ssub(s, start, len) {
adamc@829 398 return s.substring(start, start+len);
adamc@829 399 }
adamc@821 400
adamc@649 401 function pi(s) {
adamc@649 402 var r = parseInt(s);
adamc@649 403 if (r.toString() == s)
adamc@649 404 return r;
adamc@649 405 else
adamc@729 406 er("Can't parse int: " + s);
adamc@649 407 }
adamc@649 408
adamc@649 409 function pfl(s) {
adamc@649 410 var r = parseFloat(s);
adamc@649 411 if (r.toString() == s)
adamc@649 412 return r;
adamc@649 413 else
adamc@729 414 er("Can't parse float: " + s);
adamc@649 415 }
adamc@649 416
adamc@838 417 function pio(s) {
adamc@838 418 var r = parseInt(s);
adamc@838 419 if (r.toString() == s)
adamc@838 420 return r;
adamc@838 421 else
adamc@838 422 return null;
adamc@838 423 }
adamc@838 424
adamc@838 425 function pflo(s) {
adamc@838 426 var r = parseFloat(s);
adamc@838 427 if (r.toString() == s)
adamc@838 428 return r;
adamc@838 429 else
adamc@838 430 return null;
adamc@838 431 }
adamc@838 432
adamc@692 433 function uf(s) {
adamc@889 434 return escape(s).replace(new RegExp ("/", "g"), "%2F").replace(new RegExp ("\\+", "g"), "%2B");
adamc@691 435 }
adamc@691 436
adamc@692 437 function uu(s) {
adamc@889 438 return unescape(s);
adamc@692 439 }
adamc@692 440
adamc@692 441
adamc@603 442
adamc@692 443 // Remote calls
adamc@609 444
adamc@703 445 var client_id = null;
adamc@668 446 var client_pass = 0;
adamc@668 447 var url_prefix = "/";
adamc@673 448 var timeout = 60;
adamc@668 449
adamc@668 450 function getXHR(uri)
adamc@609 451 {
adamc@609 452 try {
adamc@609 453 return new XMLHttpRequest();
adamc@609 454 } catch (e) {
adamc@609 455 try {
adamc@609 456 return new ActiveXObject("Msxml2.XMLHTTP");
adamc@609 457 } catch (e) {
adamc@609 458 try {
adamc@609 459 return new ActiveXObject("Microsoft.XMLHTTP");
adamc@609 460 } catch (e) {
adamc@609 461 throw "Your browser doesn't seem to support AJAX.";
adamc@609 462 }
adamc@609 463 }
adamc@609 464 }
adamc@609 465 }
adamc@609 466
adamc@736 467 var sig = null;
adamc@736 468
adamc@736 469 function requestUri(xhr, uri, needsSig) {
adamc@668 470 xhr.open("GET", uri, true);
adamc@668 471
adamc@703 472 if (client_id != null) {
adamc@668 473 xhr.setRequestHeader("UrWeb-Client", client_id.toString());
adamc@668 474 xhr.setRequestHeader("UrWeb-Pass", client_pass.toString());
adamc@668 475 }
adamc@668 476
adamc@736 477 if (needsSig) {
adamc@736 478 if (sig == null)
adamc@736 479 whine("Missing cookie signature!");
adamc@736 480
adamc@736 481 xhr.setRequestHeader("UrWeb-Sig", sig);
adamc@736 482 }
adamc@736 483
adamc@668 484 xhr.send(null);
adamc@668 485 }
adamc@668 486
adamc@736 487 function rc(uri, parse, k, needsSig) {
adamc@728 488 uri = flattenLocal(uri);
adamc@609 489 var xhr = getXHR();
adamc@609 490
adamc@609 491 xhr.onreadystatechange = function() {
adamc@612 492 if (xhr.readyState == 4) {
adamc@612 493 var isok = false;
adamc@612 494
adamc@612 495 try {
adamc@612 496 if (xhr.status == 200)
adamc@612 497 isok = true;
adamc@612 498 } catch (e) { }
adamc@612 499
adamc@729 500 if (isok) {
adamc@729 501 try {
adamc@729 502 k(parse(xhr.responseText));
adamc@729 503 } catch (v) {
adamc@729 504 doExn(v);
adamc@729 505 }
adamc@729 506 } else {
adamc@729 507 conn();
adamc@649 508 }
adamc@612 509 }
adamc@609 510 };
adamc@609 511
adamc@736 512 requestUri(xhr, uri, needsSig);
adamc@609 513 }
adamc@667 514
adamc@667 515 function path_join(s1, s2) {
adamc@667 516 if (s1.length > 0 && s1[s1.length-1] == '/')
adamc@667 517 return s1 + s2;
adamc@667 518 else
adamc@667 519 return s1 + "/" + s2;
adamc@667 520 }
adamc@667 521
adamc@670 522 var channels = [];
adamc@670 523
adamc@670 524 function newQueue() {
adamc@670 525 return { front : null, back : null };
adamc@670 526 }
adamc@670 527 function enqueue(q, v) {
adamc@670 528 if (q.front == null) {
adamc@670 529 q.front = cons(v, null);
adamc@670 530 q.back = q.front;
adamc@670 531 } else {
adamc@670 532 var node = cons(v, null);
adamc@690 533 q.back.next = node;
adamc@670 534 q.back = node;
adamc@670 535 }
adamc@670 536 }
adamc@670 537 function dequeue(q) {
adamc@670 538 if (q.front == null)
adamc@670 539 return null;
adamc@670 540 else {
adamc@690 541 var r = q.front.data;
adamc@690 542 q.front = q.front.next;
adamc@670 543 if (q.front == null)
adamc@670 544 q.back = null;
adamc@670 545 return r;
adamc@670 546 }
adamc@670 547 }
adamc@670 548
adamc@670 549 function newChannel() {
adamc@670 550 return { msgs : newQueue(), listeners : newQueue() };
adamc@670 551 }
adamc@670 552
adamc@667 553 function listener() {
adamc@668 554 var uri = path_join(url_prefix, ".msgs");
adamc@667 555 var xhr = getXHR();
adamc@673 556 var tid, orsc, onTimeout;
adamc@673 557
adamc@673 558 var connect = function () {
adamc@673 559 xhr.onreadystatechange = orsc;
adamc@673 560 tid = window.setTimeout(onTimeout, timeout * 500);
adamc@736 561 requestUri(xhr, uri, false);
adamc@673 562 }
adamc@673 563
adamc@673 564 orsc = function() {
adamc@667 565 if (xhr.readyState == 4) {
adamc@673 566 window.clearTimeout(tid);
adamc@673 567
adamc@667 568 var isok = false;
adamc@667 569
adamc@667 570 try {
adamc@667 571 if (xhr.status == 200)
adamc@667 572 isok = true;
adamc@667 573 } catch (e) { }
adamc@667 574
adamc@668 575 if (isok) {
adamc@889 576 var text = xhr.responseText
adamc@889 577 if (text == "")
adamc@889 578 return;
adamc@889 579 var lines = text.split("\n");
adamc@889 580
adamc@729 581 if (lines.length < 2) {
adamc@729 582 discon();
adamc@729 583 return;
adamc@729 584 }
adamc@669 585
adamc@669 586 for (var i = 0; i+1 < lines.length; i += 2) {
adamc@670 587 var chn = lines[i];
adamc@670 588 var msg = lines[i+1];
adamc@670 589
adamc@670 590 if (chn < 0)
adamc@670 591 whine("Out-of-bounds channel in message from remote server");
adamc@670 592
adamc@670 593 var ch;
adamc@670 594
adamc@670 595 if (chn >= channels.length || channels[chn] == null) {
adamc@670 596 ch = newChannel();
adamc@670 597 channels[chn] = ch;
adamc@670 598 } else
adamc@670 599 ch = channels[chn];
adamc@670 600
adamc@670 601 var listener = dequeue(ch.listeners);
adamc@670 602 if (listener == null) {
adamc@670 603 enqueue(ch.msgs, msg);
adamc@670 604 } else {
adamc@728 605 try {
adamc@728 606 listener(msg);
adamc@728 607 } catch (v) {
adamc@728 608 doExn(v);
adamc@728 609 }
adamc@670 610 }
adamc@669 611 }
adamc@669 612
adamc@673 613 connect();
adamc@668 614 }
adamc@667 615 else {
adamc@729 616 try {
adamc@824 617 if (xhr.status != 0)
adamc@824 618 servErr("Error querying remote server for messages: " + xhr.status);
adamc@889 619 } catch (e) { }
adamc@667 620 }
adamc@667 621 }
adamc@667 622 };
adamc@667 623
adamc@673 624 onTimeout = function() {
adamc@673 625 xhr.abort();
adamc@673 626 connect();
adamc@673 627 };
adamc@673 628
adamc@673 629 connect();
adamc@667 630 }
adamc@670 631
adamc@670 632 function rv(chn, parse, k) {
adamc@682 633 if (chn == null)
adamc@682 634 return;
adamc@682 635
adamc@670 636 if (chn < 0)
adamc@670 637 whine("Out-of-bounds channel receive");
adamc@670 638
adamc@670 639 var ch;
adamc@670 640
adamc@670 641 if (chn >= channels.length || channels[chn] == null) {
adamc@670 642 ch = newChannel();
adamc@670 643 channels[chn] = ch;
adamc@670 644 } else
adamc@670 645 ch = channels[chn];
adamc@670 646
adamc@670 647 var msg = dequeue(ch.msgs);
adamc@670 648 if (msg == null) {
adamc@670 649 enqueue(ch.listeners, function(msg) { k(parse(msg))(null); });
adamc@670 650 } else {
adamc@728 651 try {
adamc@728 652 k(parse(msg))(null);
adamc@728 653 } catch (v) {
adamc@728 654 doExn(v);
adamc@728 655 }
adamc@670 656 }
adamc@670 657 }
adamc@693 658
adamc@693 659
adamc@895 660 // Key events
adamc@895 661
adamc@895 662 function kc(e) {
adamc@895 663 return window.event ? e.keyCode : e.which;
adamc@895 664 }
adamc@895 665
adamc@895 666
adamc@693 667 // App-specific code
adamc@693 668