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annotate lib/js/urweb.js @ 937:37dd42935dad

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Summary row with aggregates
author Adam Chlipala <adamc@hcoop.net>
date Tue, 15 Sep 2009 10:18:56 -0400
parents d136bc34e4ca
children 7710f65935b6
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 table = x.parentNode;
adamc@901 306
adamc@901 307 var arr = dummy.getElementsByTagName("tbody");
adamc@902 308 firstChild = null;
adamc@905 309 if (arr.length > 0 && table != null) {
adamc@901 310 var tbody = arr[0], next;
adamc@902 311 firstChild = document.createElement("script");
adamc@902 312 table.insertBefore(firstChild, x);
adamc@901 313 for (var node = tbody.firstChild; node; node = next) {
adamc@901 314 next = node.nextSibling;
adamc@902 315 table.insertBefore(node, x);
adamc@901 316 }
adamc@901 317 }
adamc@903 318 } else if (pnode == "tr") {
adamc@903 319 var dummy = document.createElement("body");
adamc@903 320 dummy.innerHTML = "<table><tr>" + html + "</tr></table>";
adamc@903 321 runScripts(dummy);
adamc@903 322 var table = x.parentNode;
adamc@903 323
adamc@903 324 var arr = dummy.getElementsByTagName("tr");
adamc@903 325 firstChild = null;
adamc@905 326 if (arr.length > 0 && table != null) {
adamc@903 327 var tbody = arr[0], next;
adamc@903 328 firstChild = document.createElement("script");
adamc@903 329 table.insertBefore(firstChild, x);
adamc@903 330 for (var node = tbody.firstChild; node; node = next) {
adamc@903 331 next = node.nextSibling;
adamc@903 332 table.insertBefore(node, x);
adamc@903 333 }
adamc@903 334 }
adamc@901 335 } else {
adamc@902 336 firstChild = document.createElement("span");
adamc@902 337 firstChild.innerHTML = html;
adamc@902 338 runScripts(firstChild);
adamc@900 339 if (x.parentNode)
adamc@902 340 x.parentNode.insertBefore(firstChild, x);
adamc@899 341 }
adamc@690 342 };
adamc@899 343
adamc@899 344 addNode(x);
adamc@690 345 populate(x);
adamc@571 346 }
adamc@582 347
adamc@817 348 function input(t, s, recreate) {
adamc@598 349 var x = document.createElement(t);
adamc@690 350 x.dead = false;
adamc@690 351 x.signal = ss(s);
adamc@690 352 x.sources = null;
adamc@817 353 x.recreate = recreate(x);
adamc@899 354 addNode(x);
adamc@690 355 populate(x);
adamc@816 356
adamc@816 357 return x;
adamc@816 358 }
adamc@816 359
adamc@816 360 function inp(s) {
adamc@817 361 var x = input("input", s, function(x) { return function(v) { if (x.value != v) x.value = v; }; });
adamc@816 362 x.value = s.data;
adamc@816 363 x.onkeyup = function() { sv(s, x.value) };
adamc@816 364
adamc@816 365 return x;
adamc@816 366 }
adamc@816 367
adamc@816 368 function sel(s, content) {
adamc@817 369 var x = input("select", s, function(x) { return function(v) { if (x.value != v) x.value = v; }; });
adamc@816 370 x.innerHTML = content;
adamc@816 371 x.value = s.data;
adamc@835 372 if (x.value != s.data)
adamc@835 373 sv(s, x.value);
adamc@816 374 x.onchange = function() { sv(s, x.value) };
adamc@797 375
adamc@606 376 return x;
adamc@598 377 }
adamc@598 378
adamc@817 379 function chk(s) {
adamc@817 380 var x = input("input", s, function(x) { return function(v) { if (x.checked != v) x.checked = v; }; });
adamc@817 381 x.type = "checkbox";
adamc@817 382 x.checked = s.data;
adamc@817 383 x.onchange = function() { sv(s, x.checked) };
adamc@817 384
adamc@817 385 return x;
adamc@817 386 }
adamc@817 387
adamc@800 388 function addOnChange(x, f) {
adamc@800 389 var old = x.onchange;
adamc@800 390 x.onchange = function() { old(); f (); };
adamc@800 391 }
adamc@800 392
adamc@692 393
adamc@692 394 // Basic string operations
adamc@692 395
adamc@597 396 function eh(x) {
adamc@800 397 if (x == null)
adamc@800 398 return "NULL";
adamc@800 399 else
adamc@800 400 return x.split("&").join("&amp;").split("<").join("&lt;").split(">").join("&gt;");
adamc@597 401 }
adamc@597 402
adamc@582 403 function ts(x) { return x.toString() }
adamc@586 404 function bs(b) { return (b ? "True" : "False") }
adamc@586 405
adamc@828 406 function sub(s, i) { return s[i]; }
adamc@828 407 function suf(s, i) { return s.substring(i); }
adamc@828 408 function slen(s) { return s.length; }
adamc@829 409 function sidx(s, ch) {
adamc@829 410 var r = s.indexOf(ch);
adamc@829 411 if (r == -1)
adamc@829 412 return null;
adamc@829 413 else
adamc@829 414 return r;
adamc@829 415 }
adamc@831 416 function sspn(s, chs) {
adamc@831 417 for (var i = 0; i < s.length; ++i)
adamc@831 418 if (chs.indexOf(s[i]) != -1)
adamc@831 419 return i;
adamc@831 420
adamc@831 421 return null;
adamc@831 422 }
adamc@829 423 function schr(s, ch) {
adamc@829 424 var r = s.indexOf(ch);
adamc@829 425 if (r == -1)
adamc@829 426 return null;
adamc@829 427 else
adamc@829 428 return s.substring(r);
adamc@829 429 }
adamc@829 430 function ssub(s, start, len) {
adamc@829 431 return s.substring(start, start+len);
adamc@829 432 }
adamc@821 433
adamc@649 434 function pi(s) {
adamc@649 435 var r = parseInt(s);
adamc@649 436 if (r.toString() == s)
adamc@649 437 return r;
adamc@649 438 else
adamc@729 439 er("Can't parse int: " + s);
adamc@649 440 }
adamc@649 441
adamc@649 442 function pfl(s) {
adamc@649 443 var r = parseFloat(s);
adamc@649 444 if (r.toString() == s)
adamc@649 445 return r;
adamc@649 446 else
adamc@729 447 er("Can't parse float: " + s);
adamc@649 448 }
adamc@649 449
adamc@838 450 function pio(s) {
adamc@838 451 var r = parseInt(s);
adamc@838 452 if (r.toString() == s)
adamc@838 453 return r;
adamc@838 454 else
adamc@838 455 return null;
adamc@838 456 }
adamc@838 457
adamc@838 458 function pflo(s) {
adamc@838 459 var r = parseFloat(s);
adamc@838 460 if (r.toString() == s)
adamc@838 461 return r;
adamc@838 462 else
adamc@838 463 return null;
adamc@838 464 }
adamc@838 465
adamc@692 466 function uf(s) {
adamc@925 467 if (s.length == 0)
adamc@925 468 return "_";
adamc@925 469 return (s[0] == '_' ? "_" : "")
adamc@925 470 + escape(s).replace(new RegExp ("/", "g"), "%2F").replace(new RegExp ("\\+", "g"), "%2B");
adamc@691 471 }
adamc@691 472
adamc@692 473 function uu(s) {
adamc@925 474 if (s.length > 0 && s[0] == '_')
adamc@925 475 s = s.substring(1);
adamc@927 476 else if (s.length >= 3 && s[0] == '%' && s[1] == '5' && (s[2] == 'f' || s[2] == 'F'))
adamc@927 477 s = s.substring(3);
adamc@905 478 return unescape(s.replace(new RegExp ("\\+", "g"), " "));
adamc@905 479 }
adamc@905 480
adamc@912 481 function ub(b) {
adamc@912 482 return b ? "1" : "0";
adamc@912 483 }
adamc@912 484
adamc@905 485 function uul(getToken, getData) {
adamc@905 486 var tok = getToken();
adamc@905 487 if (tok == "Nil") {
adamc@905 488 return null;
adamc@905 489 } else if (tok == "Cons") {
adamc@905 490 var d = getData();
adamc@905 491 var l = uul(getToken, getData);
adamc@905 492 return {_1:d, _2:l};
adamc@905 493 } else
adamc@905 494 throw ("Can't unmarshal list (" + tok + ")");
adamc@692 495 }
adamc@692 496
adamc@692 497
adamc@603 498
adamc@692 499 // Remote calls
adamc@609 500
adamc@703 501 var client_id = null;
adamc@668 502 var client_pass = 0;
adamc@668 503 var url_prefix = "/";
adamc@673 504 var timeout = 60;
adamc@668 505
adamc@668 506 function getXHR(uri)
adamc@609 507 {
adamc@609 508 try {
adamc@609 509 return new XMLHttpRequest();
adamc@609 510 } catch (e) {
adamc@609 511 try {
adamc@609 512 return new ActiveXObject("Msxml2.XMLHTTP");
adamc@609 513 } catch (e) {
adamc@609 514 try {
adamc@609 515 return new ActiveXObject("Microsoft.XMLHTTP");
adamc@609 516 } catch (e) {
adamc@609 517 throw "Your browser doesn't seem to support AJAX.";
adamc@609 518 }
adamc@609 519 }
adamc@609 520 }
adamc@609 521 }
adamc@609 522
adamc@736 523 var sig = null;
adamc@736 524
adamc@736 525 function requestUri(xhr, uri, needsSig) {
adamc@668 526 xhr.open("GET", uri, true);
adamc@668 527
adamc@703 528 if (client_id != null) {
adamc@668 529 xhr.setRequestHeader("UrWeb-Client", client_id.toString());
adamc@668 530 xhr.setRequestHeader("UrWeb-Pass", client_pass.toString());
adamc@668 531 }
adamc@668 532
adamc@736 533 if (needsSig) {
adamc@736 534 if (sig == null)
adamc@736 535 whine("Missing cookie signature!");
adamc@736 536
adamc@736 537 xhr.setRequestHeader("UrWeb-Sig", sig);
adamc@736 538 }
adamc@736 539
adamc@668 540 xhr.send(null);
adamc@668 541 }
adamc@668 542
adamc@736 543 function rc(uri, parse, k, needsSig) {
adamc@728 544 uri = flattenLocal(uri);
adamc@609 545 var xhr = getXHR();
adamc@609 546
adamc@609 547 xhr.onreadystatechange = function() {
adamc@612 548 if (xhr.readyState == 4) {
adamc@612 549 var isok = false;
adamc@612 550
adamc@612 551 try {
adamc@612 552 if (xhr.status == 200)
adamc@612 553 isok = true;
adamc@612 554 } catch (e) { }
adamc@612 555
adamc@729 556 if (isok) {
adamc@729 557 try {
adamc@729 558 k(parse(xhr.responseText));
adamc@729 559 } catch (v) {
adamc@729 560 doExn(v);
adamc@729 561 }
adamc@729 562 } else {
adamc@729 563 conn();
adamc@649 564 }
adamc@612 565 }
adamc@609 566 };
adamc@609 567
adamc@736 568 requestUri(xhr, uri, needsSig);
adamc@609 569 }
adamc@667 570
adamc@667 571 function path_join(s1, s2) {
adamc@667 572 if (s1.length > 0 && s1[s1.length-1] == '/')
adamc@667 573 return s1 + s2;
adamc@667 574 else
adamc@667 575 return s1 + "/" + s2;
adamc@667 576 }
adamc@667 577
adamc@670 578 var channels = [];
adamc@670 579
adamc@670 580 function newQueue() {
adamc@670 581 return { front : null, back : null };
adamc@670 582 }
adamc@670 583 function enqueue(q, v) {
adamc@670 584 if (q.front == null) {
adamc@670 585 q.front = cons(v, null);
adamc@670 586 q.back = q.front;
adamc@670 587 } else {
adamc@670 588 var node = cons(v, null);
adamc@690 589 q.back.next = node;
adamc@670 590 q.back = node;
adamc@670 591 }
adamc@670 592 }
adamc@670 593 function dequeue(q) {
adamc@670 594 if (q.front == null)
adamc@670 595 return null;
adamc@670 596 else {
adamc@690 597 var r = q.front.data;
adamc@690 598 q.front = q.front.next;
adamc@670 599 if (q.front == null)
adamc@670 600 q.back = null;
adamc@670 601 return r;
adamc@670 602 }
adamc@670 603 }
adamc@670 604
adamc@670 605 function newChannel() {
adamc@670 606 return { msgs : newQueue(), listeners : newQueue() };
adamc@670 607 }
adamc@670 608
adamc@667 609 function listener() {
adamc@668 610 var uri = path_join(url_prefix, ".msgs");
adamc@667 611 var xhr = getXHR();
adamc@673 612 var tid, orsc, onTimeout;
adamc@673 613
adamc@673 614 var connect = function () {
adamc@673 615 xhr.onreadystatechange = orsc;
adamc@673 616 tid = window.setTimeout(onTimeout, timeout * 500);
adamc@736 617 requestUri(xhr, uri, false);
adamc@673 618 }
adamc@673 619
adamc@673 620 orsc = function() {
adamc@667 621 if (xhr.readyState == 4) {
adamc@673 622 window.clearTimeout(tid);
adamc@673 623
adamc@667 624 var isok = false;
adamc@667 625
adamc@667 626 try {
adamc@667 627 if (xhr.status == 200)
adamc@667 628 isok = true;
adamc@667 629 } catch (e) { }
adamc@667 630
adamc@668 631 if (isok) {
adamc@889 632 var text = xhr.responseText
adamc@889 633 if (text == "")
adamc@889 634 return;
adamc@889 635 var lines = text.split("\n");
adamc@889 636
adamc@729 637 if (lines.length < 2) {
adamc@729 638 discon();
adamc@729 639 return;
adamc@729 640 }
adamc@669 641
adamc@669 642 for (var i = 0; i+1 < lines.length; i += 2) {
adamc@670 643 var chn = lines[i];
adamc@670 644 var msg = lines[i+1];
adamc@670 645
adamc@670 646 if (chn < 0)
adamc@670 647 whine("Out-of-bounds channel in message from remote server");
adamc@670 648
adamc@670 649 var ch;
adamc@670 650
adamc@670 651 if (chn >= channels.length || channels[chn] == null) {
adamc@670 652 ch = newChannel();
adamc@670 653 channels[chn] = ch;
adamc@670 654 } else
adamc@670 655 ch = channels[chn];
adamc@670 656
adamc@670 657 var listener = dequeue(ch.listeners);
adamc@670 658 if (listener == null) {
adamc@670 659 enqueue(ch.msgs, msg);
adamc@670 660 } else {
adamc@728 661 try {
adamc@728 662 listener(msg);
adamc@728 663 } catch (v) {
adamc@728 664 doExn(v);
adamc@728 665 }
adamc@670 666 }
adamc@669 667 }
adamc@669 668
adamc@673 669 connect();
adamc@668 670 }
adamc@667 671 else {
adamc@729 672 try {
adamc@824 673 if (xhr.status != 0)
adamc@824 674 servErr("Error querying remote server for messages: " + xhr.status);
adamc@889 675 } catch (e) { }
adamc@667 676 }
adamc@667 677 }
adamc@667 678 };
adamc@667 679
adamc@673 680 onTimeout = function() {
adamc@673 681 xhr.abort();
adamc@673 682 connect();
adamc@673 683 };
adamc@673 684
adamc@673 685 connect();
adamc@667 686 }
adamc@670 687
adamc@670 688 function rv(chn, parse, k) {
adamc@682 689 if (chn == null)
adamc@682 690 return;
adamc@682 691
adamc@670 692 if (chn < 0)
adamc@670 693 whine("Out-of-bounds channel receive");
adamc@670 694
adamc@670 695 var ch;
adamc@670 696
adamc@670 697 if (chn >= channels.length || channels[chn] == null) {
adamc@670 698 ch = newChannel();
adamc@670 699 channels[chn] = ch;
adamc@670 700 } else
adamc@670 701 ch = channels[chn];
adamc@670 702
adamc@670 703 var msg = dequeue(ch.msgs);
adamc@670 704 if (msg == null) {
adamc@670 705 enqueue(ch.listeners, function(msg) { k(parse(msg))(null); });
adamc@670 706 } else {
adamc@728 707 try {
adamc@728 708 k(parse(msg))(null);
adamc@728 709 } catch (v) {
adamc@728 710 doExn(v);
adamc@728 711 }
adamc@670 712 }
adamc@670 713 }
adamc@693 714
adamc@693 715
adamc@895 716 // Key events
adamc@895 717
adamc@895 718 function kc(e) {
adamc@895 719 return window.event ? e.keyCode : e.which;
adamc@895 720 }
adamc@895 721
adamc@895 722
adamc@693 723 // App-specific code
adamc@693 724