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annotate lib/js/urweb.js @ 900:ed381288ce9a

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Tweaking dyn() implementation to get grid working
author Adam Chlipala <adamc@hcoop.net>
date Thu, 06 Aug 2009 11:58:38 -0400
parents 25a038a9194b
children f17638dd3080
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@900 294 if (old.parentNode)
adamc@900 295 old.parentNode.removeChild(old);
adamc@899 296 }
adamc@690 297
adamc@703 298 var cls = {v : null};
adamc@899 299 var dummy = document.createElement("table");
adamc@899 300 dummy.innerHTML = flatten(cls, v);
adamc@703 301 x.closures = cls.v;
adamc@899 302 runScripts(dummy);
adamc@899 303
adamc@899 304 for (first = dummy.firstChild; first && first.tagName == "TBODY"; first = first.firstChild);
adamc@899 305 for (var node = first; node; ) {
adamc@899 306 var old = node;
adamc@899 307 node = node.nextSibling;
adamc@900 308 if (x.parentNode)
adamc@900 309 x.parentNode.insertBefore(old, x);
adamc@899 310 }
adamc@690 311 };
adamc@899 312
adamc@899 313 addNode(x);
adamc@690 314 populate(x);
adamc@571 315 }
adamc@582 316
adamc@817 317 function input(t, s, recreate) {
adamc@598 318 var x = document.createElement(t);
adamc@690 319 x.dead = false;
adamc@690 320 x.signal = ss(s);
adamc@690 321 x.sources = null;
adamc@817 322 x.recreate = recreate(x);
adamc@899 323 addNode(x);
adamc@690 324 populate(x);
adamc@816 325
adamc@816 326 return x;
adamc@816 327 }
adamc@816 328
adamc@816 329 function inp(s) {
adamc@817 330 var x = input("input", s, function(x) { return function(v) { if (x.value != v) x.value = v; }; });
adamc@816 331 x.value = s.data;
adamc@816 332 x.onkeyup = function() { sv(s, x.value) };
adamc@816 333
adamc@816 334 return x;
adamc@816 335 }
adamc@816 336
adamc@816 337 function sel(s, content) {
adamc@817 338 var x = input("select", s, function(x) { return function(v) { if (x.value != v) x.value = v; }; });
adamc@816 339 x.innerHTML = content;
adamc@816 340 x.value = s.data;
adamc@835 341 if (x.value != s.data)
adamc@835 342 sv(s, x.value);
adamc@816 343 x.onchange = function() { sv(s, x.value) };
adamc@797 344
adamc@606 345 return x;
adamc@598 346 }
adamc@598 347
adamc@817 348 function chk(s) {
adamc@817 349 var x = input("input", s, function(x) { return function(v) { if (x.checked != v) x.checked = v; }; });
adamc@817 350 x.type = "checkbox";
adamc@817 351 x.checked = s.data;
adamc@817 352 x.onchange = function() { sv(s, x.checked) };
adamc@817 353
adamc@817 354 return x;
adamc@817 355 }
adamc@817 356
adamc@800 357 function addOnChange(x, f) {
adamc@800 358 var old = x.onchange;
adamc@800 359 x.onchange = function() { old(); f (); };
adamc@800 360 }
adamc@800 361
adamc@692 362
adamc@692 363 // Basic string operations
adamc@692 364
adamc@597 365 function eh(x) {
adamc@800 366 if (x == null)
adamc@800 367 return "NULL";
adamc@800 368 else
adamc@800 369 return x.split("&").join("&amp;").split("<").join("&lt;").split(">").join("&gt;");
adamc@597 370 }
adamc@597 371
adamc@582 372 function ts(x) { return x.toString() }
adamc@586 373 function bs(b) { return (b ? "True" : "False") }
adamc@586 374
adamc@828 375 function sub(s, i) { return s[i]; }
adamc@828 376 function suf(s, i) { return s.substring(i); }
adamc@828 377 function slen(s) { return s.length; }
adamc@829 378 function sidx(s, ch) {
adamc@829 379 var r = s.indexOf(ch);
adamc@829 380 if (r == -1)
adamc@829 381 return null;
adamc@829 382 else
adamc@829 383 return r;
adamc@829 384 }
adamc@831 385 function sspn(s, chs) {
adamc@831 386 for (var i = 0; i < s.length; ++i)
adamc@831 387 if (chs.indexOf(s[i]) != -1)
adamc@831 388 return i;
adamc@831 389
adamc@831 390 return null;
adamc@831 391 }
adamc@829 392 function schr(s, ch) {
adamc@829 393 var r = s.indexOf(ch);
adamc@829 394 if (r == -1)
adamc@829 395 return null;
adamc@829 396 else
adamc@829 397 return s.substring(r);
adamc@829 398 }
adamc@829 399 function ssub(s, start, len) {
adamc@829 400 return s.substring(start, start+len);
adamc@829 401 }
adamc@821 402
adamc@649 403 function pi(s) {
adamc@649 404 var r = parseInt(s);
adamc@649 405 if (r.toString() == s)
adamc@649 406 return r;
adamc@649 407 else
adamc@729 408 er("Can't parse int: " + s);
adamc@649 409 }
adamc@649 410
adamc@649 411 function pfl(s) {
adamc@649 412 var r = parseFloat(s);
adamc@649 413 if (r.toString() == s)
adamc@649 414 return r;
adamc@649 415 else
adamc@729 416 er("Can't parse float: " + s);
adamc@649 417 }
adamc@649 418
adamc@838 419 function pio(s) {
adamc@838 420 var r = parseInt(s);
adamc@838 421 if (r.toString() == s)
adamc@838 422 return r;
adamc@838 423 else
adamc@838 424 return null;
adamc@838 425 }
adamc@838 426
adamc@838 427 function pflo(s) {
adamc@838 428 var r = parseFloat(s);
adamc@838 429 if (r.toString() == s)
adamc@838 430 return r;
adamc@838 431 else
adamc@838 432 return null;
adamc@838 433 }
adamc@838 434
adamc@692 435 function uf(s) {
adamc@889 436 return escape(s).replace(new RegExp ("/", "g"), "%2F").replace(new RegExp ("\\+", "g"), "%2B");
adamc@691 437 }
adamc@691 438
adamc@692 439 function uu(s) {
adamc@889 440 return unescape(s);
adamc@692 441 }
adamc@692 442
adamc@692 443
adamc@603 444
adamc@692 445 // Remote calls
adamc@609 446
adamc@703 447 var client_id = null;
adamc@668 448 var client_pass = 0;
adamc@668 449 var url_prefix = "/";
adamc@673 450 var timeout = 60;
adamc@668 451
adamc@668 452 function getXHR(uri)
adamc@609 453 {
adamc@609 454 try {
adamc@609 455 return new XMLHttpRequest();
adamc@609 456 } catch (e) {
adamc@609 457 try {
adamc@609 458 return new ActiveXObject("Msxml2.XMLHTTP");
adamc@609 459 } catch (e) {
adamc@609 460 try {
adamc@609 461 return new ActiveXObject("Microsoft.XMLHTTP");
adamc@609 462 } catch (e) {
adamc@609 463 throw "Your browser doesn't seem to support AJAX.";
adamc@609 464 }
adamc@609 465 }
adamc@609 466 }
adamc@609 467 }
adamc@609 468
adamc@736 469 var sig = null;
adamc@736 470
adamc@736 471 function requestUri(xhr, uri, needsSig) {
adamc@668 472 xhr.open("GET", uri, true);
adamc@668 473
adamc@703 474 if (client_id != null) {
adamc@668 475 xhr.setRequestHeader("UrWeb-Client", client_id.toString());
adamc@668 476 xhr.setRequestHeader("UrWeb-Pass", client_pass.toString());
adamc@668 477 }
adamc@668 478
adamc@736 479 if (needsSig) {
adamc@736 480 if (sig == null)
adamc@736 481 whine("Missing cookie signature!");
adamc@736 482
adamc@736 483 xhr.setRequestHeader("UrWeb-Sig", sig);
adamc@736 484 }
adamc@736 485
adamc@668 486 xhr.send(null);
adamc@668 487 }
adamc@668 488
adamc@736 489 function rc(uri, parse, k, needsSig) {
adamc@728 490 uri = flattenLocal(uri);
adamc@609 491 var xhr = getXHR();
adamc@609 492
adamc@609 493 xhr.onreadystatechange = function() {
adamc@612 494 if (xhr.readyState == 4) {
adamc@612 495 var isok = false;
adamc@612 496
adamc@612 497 try {
adamc@612 498 if (xhr.status == 200)
adamc@612 499 isok = true;
adamc@612 500 } catch (e) { }
adamc@612 501
adamc@729 502 if (isok) {
adamc@729 503 try {
adamc@729 504 k(parse(xhr.responseText));
adamc@729 505 } catch (v) {
adamc@729 506 doExn(v);
adamc@729 507 }
adamc@729 508 } else {
adamc@729 509 conn();
adamc@649 510 }
adamc@612 511 }
adamc@609 512 };
adamc@609 513
adamc@736 514 requestUri(xhr, uri, needsSig);
adamc@609 515 }
adamc@667 516
adamc@667 517 function path_join(s1, s2) {
adamc@667 518 if (s1.length > 0 && s1[s1.length-1] == '/')
adamc@667 519 return s1 + s2;
adamc@667 520 else
adamc@667 521 return s1 + "/" + s2;
adamc@667 522 }
adamc@667 523
adamc@670 524 var channels = [];
adamc@670 525
adamc@670 526 function newQueue() {
adamc@670 527 return { front : null, back : null };
adamc@670 528 }
adamc@670 529 function enqueue(q, v) {
adamc@670 530 if (q.front == null) {
adamc@670 531 q.front = cons(v, null);
adamc@670 532 q.back = q.front;
adamc@670 533 } else {
adamc@670 534 var node = cons(v, null);
adamc@690 535 q.back.next = node;
adamc@670 536 q.back = node;
adamc@670 537 }
adamc@670 538 }
adamc@670 539 function dequeue(q) {
adamc@670 540 if (q.front == null)
adamc@670 541 return null;
adamc@670 542 else {
adamc@690 543 var r = q.front.data;
adamc@690 544 q.front = q.front.next;
adamc@670 545 if (q.front == null)
adamc@670 546 q.back = null;
adamc@670 547 return r;
adamc@670 548 }
adamc@670 549 }
adamc@670 550
adamc@670 551 function newChannel() {
adamc@670 552 return { msgs : newQueue(), listeners : newQueue() };
adamc@670 553 }
adamc@670 554
adamc@667 555 function listener() {
adamc@668 556 var uri = path_join(url_prefix, ".msgs");
adamc@667 557 var xhr = getXHR();
adamc@673 558 var tid, orsc, onTimeout;
adamc@673 559
adamc@673 560 var connect = function () {
adamc@673 561 xhr.onreadystatechange = orsc;
adamc@673 562 tid = window.setTimeout(onTimeout, timeout * 500);
adamc@736 563 requestUri(xhr, uri, false);
adamc@673 564 }
adamc@673 565
adamc@673 566 orsc = function() {
adamc@667 567 if (xhr.readyState == 4) {
adamc@673 568 window.clearTimeout(tid);
adamc@673 569
adamc@667 570 var isok = false;
adamc@667 571
adamc@667 572 try {
adamc@667 573 if (xhr.status == 200)
adamc@667 574 isok = true;
adamc@667 575 } catch (e) { }
adamc@667 576
adamc@668 577 if (isok) {
adamc@889 578 var text = xhr.responseText
adamc@889 579 if (text == "")
adamc@889 580 return;
adamc@889 581 var lines = text.split("\n");
adamc@889 582
adamc@729 583 if (lines.length < 2) {
adamc@729 584 discon();
adamc@729 585 return;
adamc@729 586 }
adamc@669 587
adamc@669 588 for (var i = 0; i+1 < lines.length; i += 2) {
adamc@670 589 var chn = lines[i];
adamc@670 590 var msg = lines[i+1];
adamc@670 591
adamc@670 592 if (chn < 0)
adamc@670 593 whine("Out-of-bounds channel in message from remote server");
adamc@670 594
adamc@670 595 var ch;
adamc@670 596
adamc@670 597 if (chn >= channels.length || channels[chn] == null) {
adamc@670 598 ch = newChannel();
adamc@670 599 channels[chn] = ch;
adamc@670 600 } else
adamc@670 601 ch = channels[chn];
adamc@670 602
adamc@670 603 var listener = dequeue(ch.listeners);
adamc@670 604 if (listener == null) {
adamc@670 605 enqueue(ch.msgs, msg);
adamc@670 606 } else {
adamc@728 607 try {
adamc@728 608 listener(msg);
adamc@728 609 } catch (v) {
adamc@728 610 doExn(v);
adamc@728 611 }
adamc@670 612 }
adamc@669 613 }
adamc@669 614
adamc@673 615 connect();
adamc@668 616 }
adamc@667 617 else {
adamc@729 618 try {
adamc@824 619 if (xhr.status != 0)
adamc@824 620 servErr("Error querying remote server for messages: " + xhr.status);
adamc@889 621 } catch (e) { }
adamc@667 622 }
adamc@667 623 }
adamc@667 624 };
adamc@667 625
adamc@673 626 onTimeout = function() {
adamc@673 627 xhr.abort();
adamc@673 628 connect();
adamc@673 629 };
adamc@673 630
adamc@673 631 connect();
adamc@667 632 }
adamc@670 633
adamc@670 634 function rv(chn, parse, k) {
adamc@682 635 if (chn == null)
adamc@682 636 return;
adamc@682 637
adamc@670 638 if (chn < 0)
adamc@670 639 whine("Out-of-bounds channel receive");
adamc@670 640
adamc@670 641 var ch;
adamc@670 642
adamc@670 643 if (chn >= channels.length || channels[chn] == null) {
adamc@670 644 ch = newChannel();
adamc@670 645 channels[chn] = ch;
adamc@670 646 } else
adamc@670 647 ch = channels[chn];
adamc@670 648
adamc@670 649 var msg = dequeue(ch.msgs);
adamc@670 650 if (msg == null) {
adamc@670 651 enqueue(ch.listeners, function(msg) { k(parse(msg))(null); });
adamc@670 652 } else {
adamc@728 653 try {
adamc@728 654 k(parse(msg))(null);
adamc@728 655 } catch (v) {
adamc@728 656 doExn(v);
adamc@728 657 }
adamc@670 658 }
adamc@670 659 }
adamc@693 660
adamc@693 661
adamc@895 662 // Key events
adamc@895 663
adamc@895 664 function kc(e) {
adamc@895 665 return window.event ? e.keyCode : e.which;
adamc@895 666 }
adamc@895 667
adamc@895 668
adamc@693 669 // App-specific code
adamc@693 670