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annotate lib/js/urweb.js @ 898:d1d0b18afd3d

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Working on Grid; have gone from one dynamic table bizareness to another
author Adam Chlipala <adamc@hcoop.net>
date Sun, 19 Jul 2009 17:45:02 -0400
parents ae9e22822ec5
children 25a038a9194b
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@604 231 if (thisScript) {
adamc@604 232 thisScript.parentNode.appendChild(node);
adamc@604 233 thisScript.parentNode.removeChild(thisScript);
adamc@898 234 } else {
adamc@604 235 lastParent().appendChild(node);
adamc@898 236 }
adamc@603 237 }
adamc@603 238
adamc@812 239 function setHTML(html) {
adamc@812 240 var x = document.createElement("span");
adamc@812 241 x.dead = false;
adamc@812 242 x.signal = null;
adamc@812 243 x.sources = null;
adamc@812 244 x.closures = null;
adamc@812 245 x.innerHTML = html;
adamc@812 246 addNode(x);
adamc@812 247 runScripts(x);
adamc@812 248 }
adamc@812 249
adamc@690 250 var thisScript = null;
adamc@690 251
adamc@604 252 function runScripts(node) {
adamc@604 253 var savedScript = thisScript;
adamc@603 254
adamc@692 255 var scripts = node.getElementsByTagName("script"), scriptsCopy = [];
adamc@604 256 var len = scripts.length;
adamc@646 257 for (var i = 0; i < len; ++i)
adamc@646 258 scriptsCopy[i] = scripts[i];
adamc@604 259 for (var i = 0; i < len; ++i) {
adamc@646 260 thisScript = scriptsCopy[i];
adamc@729 261 try {
adamc@729 262 eval(thisScript.textContent);
adamc@729 263 } catch (v) {
adamc@729 264 doExn(v);
adamc@729 265 }
adamc@604 266 }
adamc@604 267
adamc@604 268 thisScript = savedScript;
adamc@603 269 }
adamc@603 270
adamc@603 271
adamc@692 272 // Dynamic tree entry points
adamc@692 273
adamc@571 274 function dyn(s) {
adamc@898 275 var x = parent();
adamc@690 276 x.dead = false;
adamc@690 277 x.signal = s;
adamc@690 278 x.sources = null;
adamc@703 279 x.closures = null;
adamc@690 280 x.recreate = function(v) {
adamc@703 281 for (var ls = x.closures; ls; ls = ls.next)
adamc@703 282 freeClosure(ls.data);
adamc@692 283
adamc@847 284 var doKind = function(kind) {
adamc@847 285 var arr = x.getElementsByTagName(kind);
adamc@847 286 for (var i = 0; i < arr.length; ++i) {
adamc@847 287 var span = arr[i];
adamc@847 288 span.dead = true;
adamc@847 289 for (var ls = span.sources; ls; ls = ls.next)
adamc@847 290 ls.data.dyns = remove(span, ls.data.dyns);
adamc@847 291 for (var ls = span.closures; ls; ls = ls.next)
adamc@847 292 freeClosure(ls.data);
adamc@847 293 }
adamc@847 294 };
adamc@847 295
adamc@847 296 doKind("span");
adamc@847 297 doKind("tbody");
adamc@690 298
adamc@703 299 var cls = {v : null};
adamc@703 300 x.innerHTML = flatten(cls, v);
adamc@703 301 x.closures = cls.v;
adamc@690 302 runScripts(x);
adamc@690 303 };
adamc@690 304 populate(x);
adamc@571 305 }
adamc@582 306
adamc@817 307 function input(t, s, recreate) {
adamc@598 308 var x = document.createElement(t);
adamc@690 309 x.dead = false;
adamc@690 310 x.signal = ss(s);
adamc@690 311 x.sources = null;
adamc@817 312 x.recreate = recreate(x);
adamc@690 313 populate(x);
adamc@604 314 addNode(x);
adamc@816 315
adamc@816 316 return x;
adamc@816 317 }
adamc@816 318
adamc@816 319 function inp(s) {
adamc@817 320 var x = input("input", s, function(x) { return function(v) { if (x.value != v) x.value = v; }; });
adamc@816 321 x.value = s.data;
adamc@816 322 x.onkeyup = function() { sv(s, x.value) };
adamc@816 323
adamc@816 324 return x;
adamc@816 325 }
adamc@816 326
adamc@816 327 function sel(s, content) {
adamc@817 328 var x = input("select", s, function(x) { return function(v) { if (x.value != v) x.value = v; }; });
adamc@816 329 x.innerHTML = content;
adamc@816 330 x.value = s.data;
adamc@835 331 if (x.value != s.data)
adamc@835 332 sv(s, x.value);
adamc@816 333 x.onchange = function() { sv(s, x.value) };
adamc@797 334
adamc@835 335
adamc@606 336 return x;
adamc@598 337 }
adamc@598 338
adamc@817 339 function chk(s) {
adamc@817 340 var x = input("input", s, function(x) { return function(v) { if (x.checked != v) x.checked = v; }; });
adamc@817 341 x.type = "checkbox";
adamc@817 342 x.checked = s.data;
adamc@817 343 x.onchange = function() { sv(s, x.checked) };
adamc@817 344
adamc@817 345 return x;
adamc@817 346 }
adamc@817 347
adamc@800 348 function addOnChange(x, f) {
adamc@800 349 var old = x.onchange;
adamc@800 350 x.onchange = function() { old(); f (); };
adamc@800 351 }
adamc@800 352
adamc@692 353
adamc@692 354 // Basic string operations
adamc@692 355
adamc@597 356 function eh(x) {
adamc@800 357 if (x == null)
adamc@800 358 return "NULL";
adamc@800 359 else
adamc@800 360 return x.split("&").join("&amp;").split("<").join("&lt;").split(">").join("&gt;");
adamc@597 361 }
adamc@597 362
adamc@582 363 function ts(x) { return x.toString() }
adamc@586 364 function bs(b) { return (b ? "True" : "False") }
adamc@586 365
adamc@828 366 function sub(s, i) { return s[i]; }
adamc@828 367 function suf(s, i) { return s.substring(i); }
adamc@828 368 function slen(s) { return s.length; }
adamc@829 369 function sidx(s, ch) {
adamc@829 370 var r = s.indexOf(ch);
adamc@829 371 if (r == -1)
adamc@829 372 return null;
adamc@829 373 else
adamc@829 374 return r;
adamc@829 375 }
adamc@831 376 function sspn(s, chs) {
adamc@831 377 for (var i = 0; i < s.length; ++i)
adamc@831 378 if (chs.indexOf(s[i]) != -1)
adamc@831 379 return i;
adamc@831 380
adamc@831 381 return null;
adamc@831 382 }
adamc@829 383 function schr(s, ch) {
adamc@829 384 var r = s.indexOf(ch);
adamc@829 385 if (r == -1)
adamc@829 386 return null;
adamc@829 387 else
adamc@829 388 return s.substring(r);
adamc@829 389 }
adamc@829 390 function ssub(s, start, len) {
adamc@829 391 return s.substring(start, start+len);
adamc@829 392 }
adamc@821 393
adamc@649 394 function pi(s) {
adamc@649 395 var r = parseInt(s);
adamc@649 396 if (r.toString() == s)
adamc@649 397 return r;
adamc@649 398 else
adamc@729 399 er("Can't parse int: " + s);
adamc@649 400 }
adamc@649 401
adamc@649 402 function pfl(s) {
adamc@649 403 var r = parseFloat(s);
adamc@649 404 if (r.toString() == s)
adamc@649 405 return r;
adamc@649 406 else
adamc@729 407 er("Can't parse float: " + s);
adamc@649 408 }
adamc@649 409
adamc@838 410 function pio(s) {
adamc@838 411 var r = parseInt(s);
adamc@838 412 if (r.toString() == s)
adamc@838 413 return r;
adamc@838 414 else
adamc@838 415 return null;
adamc@838 416 }
adamc@838 417
adamc@838 418 function pflo(s) {
adamc@838 419 var r = parseFloat(s);
adamc@838 420 if (r.toString() == s)
adamc@838 421 return r;
adamc@838 422 else
adamc@838 423 return null;
adamc@838 424 }
adamc@838 425
adamc@692 426 function uf(s) {
adamc@889 427 return escape(s).replace(new RegExp ("/", "g"), "%2F").replace(new RegExp ("\\+", "g"), "%2B");
adamc@691 428 }
adamc@691 429
adamc@692 430 function uu(s) {
adamc@889 431 return unescape(s);
adamc@692 432 }
adamc@692 433
adamc@692 434
adamc@603 435
adamc@692 436 // Remote calls
adamc@609 437
adamc@703 438 var client_id = null;
adamc@668 439 var client_pass = 0;
adamc@668 440 var url_prefix = "/";
adamc@673 441 var timeout = 60;
adamc@668 442
adamc@668 443 function getXHR(uri)
adamc@609 444 {
adamc@609 445 try {
adamc@609 446 return new XMLHttpRequest();
adamc@609 447 } catch (e) {
adamc@609 448 try {
adamc@609 449 return new ActiveXObject("Msxml2.XMLHTTP");
adamc@609 450 } catch (e) {
adamc@609 451 try {
adamc@609 452 return new ActiveXObject("Microsoft.XMLHTTP");
adamc@609 453 } catch (e) {
adamc@609 454 throw "Your browser doesn't seem to support AJAX.";
adamc@609 455 }
adamc@609 456 }
adamc@609 457 }
adamc@609 458 }
adamc@609 459
adamc@736 460 var sig = null;
adamc@736 461
adamc@736 462 function requestUri(xhr, uri, needsSig) {
adamc@668 463 xhr.open("GET", uri, true);
adamc@668 464
adamc@703 465 if (client_id != null) {
adamc@668 466 xhr.setRequestHeader("UrWeb-Client", client_id.toString());
adamc@668 467 xhr.setRequestHeader("UrWeb-Pass", client_pass.toString());
adamc@668 468 }
adamc@668 469
adamc@736 470 if (needsSig) {
adamc@736 471 if (sig == null)
adamc@736 472 whine("Missing cookie signature!");
adamc@736 473
adamc@736 474 xhr.setRequestHeader("UrWeb-Sig", sig);
adamc@736 475 }
adamc@736 476
adamc@668 477 xhr.send(null);
adamc@668 478 }
adamc@668 479
adamc@736 480 function rc(uri, parse, k, needsSig) {
adamc@728 481 uri = flattenLocal(uri);
adamc@609 482 var xhr = getXHR();
adamc@609 483
adamc@609 484 xhr.onreadystatechange = function() {
adamc@612 485 if (xhr.readyState == 4) {
adamc@612 486 var isok = false;
adamc@612 487
adamc@612 488 try {
adamc@612 489 if (xhr.status == 200)
adamc@612 490 isok = true;
adamc@612 491 } catch (e) { }
adamc@612 492
adamc@729 493 if (isok) {
adamc@729 494 try {
adamc@729 495 k(parse(xhr.responseText));
adamc@729 496 } catch (v) {
adamc@729 497 doExn(v);
adamc@729 498 }
adamc@729 499 } else {
adamc@729 500 conn();
adamc@649 501 }
adamc@612 502 }
adamc@609 503 };
adamc@609 504
adamc@736 505 requestUri(xhr, uri, needsSig);
adamc@609 506 }
adamc@667 507
adamc@667 508 function path_join(s1, s2) {
adamc@667 509 if (s1.length > 0 && s1[s1.length-1] == '/')
adamc@667 510 return s1 + s2;
adamc@667 511 else
adamc@667 512 return s1 + "/" + s2;
adamc@667 513 }
adamc@667 514
adamc@670 515 var channels = [];
adamc@670 516
adamc@670 517 function newQueue() {
adamc@670 518 return { front : null, back : null };
adamc@670 519 }
adamc@670 520 function enqueue(q, v) {
adamc@670 521 if (q.front == null) {
adamc@670 522 q.front = cons(v, null);
adamc@670 523 q.back = q.front;
adamc@670 524 } else {
adamc@670 525 var node = cons(v, null);
adamc@690 526 q.back.next = node;
adamc@670 527 q.back = node;
adamc@670 528 }
adamc@670 529 }
adamc@670 530 function dequeue(q) {
adamc@670 531 if (q.front == null)
adamc@670 532 return null;
adamc@670 533 else {
adamc@690 534 var r = q.front.data;
adamc@690 535 q.front = q.front.next;
adamc@670 536 if (q.front == null)
adamc@670 537 q.back = null;
adamc@670 538 return r;
adamc@670 539 }
adamc@670 540 }
adamc@670 541
adamc@670 542 function newChannel() {
adamc@670 543 return { msgs : newQueue(), listeners : newQueue() };
adamc@670 544 }
adamc@670 545
adamc@667 546 function listener() {
adamc@668 547 var uri = path_join(url_prefix, ".msgs");
adamc@667 548 var xhr = getXHR();
adamc@673 549 var tid, orsc, onTimeout;
adamc@673 550
adamc@673 551 var connect = function () {
adamc@673 552 xhr.onreadystatechange = orsc;
adamc@673 553 tid = window.setTimeout(onTimeout, timeout * 500);
adamc@736 554 requestUri(xhr, uri, false);
adamc@673 555 }
adamc@673 556
adamc@673 557 orsc = function() {
adamc@667 558 if (xhr.readyState == 4) {
adamc@673 559 window.clearTimeout(tid);
adamc@673 560
adamc@667 561 var isok = false;
adamc@667 562
adamc@667 563 try {
adamc@667 564 if (xhr.status == 200)
adamc@667 565 isok = true;
adamc@667 566 } catch (e) { }
adamc@667 567
adamc@668 568 if (isok) {
adamc@889 569 var text = xhr.responseText
adamc@889 570 if (text == "")
adamc@889 571 return;
adamc@889 572 var lines = text.split("\n");
adamc@889 573
adamc@729 574 if (lines.length < 2) {
adamc@729 575 discon();
adamc@729 576 return;
adamc@729 577 }
adamc@669 578
adamc@669 579 for (var i = 0; i+1 < lines.length; i += 2) {
adamc@670 580 var chn = lines[i];
adamc@670 581 var msg = lines[i+1];
adamc@670 582
adamc@670 583 if (chn < 0)
adamc@670 584 whine("Out-of-bounds channel in message from remote server");
adamc@670 585
adamc@670 586 var ch;
adamc@670 587
adamc@670 588 if (chn >= channels.length || channels[chn] == null) {
adamc@670 589 ch = newChannel();
adamc@670 590 channels[chn] = ch;
adamc@670 591 } else
adamc@670 592 ch = channels[chn];
adamc@670 593
adamc@670 594 var listener = dequeue(ch.listeners);
adamc@670 595 if (listener == null) {
adamc@670 596 enqueue(ch.msgs, msg);
adamc@670 597 } else {
adamc@728 598 try {
adamc@728 599 listener(msg);
adamc@728 600 } catch (v) {
adamc@728 601 doExn(v);
adamc@728 602 }
adamc@670 603 }
adamc@669 604 }
adamc@669 605
adamc@673 606 connect();
adamc@668 607 }
adamc@667 608 else {
adamc@729 609 try {
adamc@824 610 if (xhr.status != 0)
adamc@824 611 servErr("Error querying remote server for messages: " + xhr.status);
adamc@889 612 } catch (e) { }
adamc@667 613 }
adamc@667 614 }
adamc@667 615 };
adamc@667 616
adamc@673 617 onTimeout = function() {
adamc@673 618 xhr.abort();
adamc@673 619 connect();
adamc@673 620 };
adamc@673 621
adamc@673 622 connect();
adamc@667 623 }
adamc@670 624
adamc@670 625 function rv(chn, parse, k) {
adamc@682 626 if (chn == null)
adamc@682 627 return;
adamc@682 628
adamc@670 629 if (chn < 0)
adamc@670 630 whine("Out-of-bounds channel receive");
adamc@670 631
adamc@670 632 var ch;
adamc@670 633
adamc@670 634 if (chn >= channels.length || channels[chn] == null) {
adamc@670 635 ch = newChannel();
adamc@670 636 channels[chn] = ch;
adamc@670 637 } else
adamc@670 638 ch = channels[chn];
adamc@670 639
adamc@670 640 var msg = dequeue(ch.msgs);
adamc@670 641 if (msg == null) {
adamc@670 642 enqueue(ch.listeners, function(msg) { k(parse(msg))(null); });
adamc@670 643 } else {
adamc@728 644 try {
adamc@728 645 k(parse(msg))(null);
adamc@728 646 } catch (v) {
adamc@728 647 doExn(v);
adamc@728 648 }
adamc@670 649 }
adamc@670 650 }
adamc@693 651
adamc@693 652
adamc@895 653 // Key events
adamc@895 654
adamc@895 655 function kc(e) {
adamc@895 656 return window.event ? e.keyCode : e.which;
adamc@895 657 }
adamc@895 658
adamc@895 659
adamc@693 660 // App-specific code
adamc@693 661