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annotate lib/js/urweb.js @ 969:001edfbe2561

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Iterative versions of some JavaScript list functions
author Adam Chlipala <adamc@hcoop.net>
date Tue, 22 Sep 2009 09:53:05 -0400
parents 1b80b9df0d32
children 8371d12ae63f
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@969 6 function rev(ls) {
adamc@969 7 var acc = null;
adamc@969 8 for (; ls; ls = ls.next)
adamc@969 9 acc = cons(ls.data, acc);
adamc@969 10 return acc;
adamc@969 11 }
adamc@690 12 function concat(ls1, ls2) {
adamc@969 13 var acc = ls2;
adamc@969 14 ls1 = rev(ls1);
adamc@969 15 for (; ls1; ls1 = ls1.next)
adamc@969 16 acc = cons(ls1.data, acc);
adamc@969 17 return acc;
adamc@690 18 }
adamc@690 19 function member(x, ls) {
adamc@690 20 for (; ls; ls = ls.next)
adamc@690 21 if (ls.data == x)
adamc@690 22 return true;
adamc@690 23 return false;
adamc@690 24 }
adamc@690 25 function remove(x, ls) {
adamc@969 26 var acc = null;
adamc@969 27
adamc@969 28 for (; ls; ls = ls.next)
adamc@969 29 if (ls.data == x)
adamc@969 30 return concat(acc, ls.next);
adamc@969 31 else
adamc@969 32 acc = cons(ls.data, acc);
adamc@969 33
adamc@969 34 return ls;
adamc@690 35 }
adamc@690 36 function union(ls1, ls2) {
adamc@969 37 var acc = ls2;
adamc@969 38
adamc@969 39 for (; ls1; ls1 = ls1.next)
adamc@969 40 if (!member(ls1.data, ls2))
adamc@969 41 acc = cons(ls1.data, acc);
adamc@969 42
adamc@969 43 return acc;
adamc@580 44 }
adamc@703 45 function length(ls) {
adamc@969 46 var acc = 0;
adamc@969 47
adamc@969 48 for (; ls; ls = ls.next)
adamc@969 49 ++acc;
adamc@969 50
adamc@969 51 return acc;
adamc@703 52 }
adamc@670 53
adamc@690 54
adamc@729 55 // Error handling
adamc@729 56
adamc@729 57 function whine(msg) {
adamc@729 58 alert(msg);
adamc@729 59 throw msg;
adamc@729 60 }
adamc@729 61
adamc@810 62 function pf(loc) {
adamc@835 63 throw ("Pattern match failure (" + loc + ")");
adamc@729 64 }
adamc@729 65
adamc@798 66 function runHandlers(kind, ls, arg) {
adamc@798 67 if (ls == null)
adamc@798 68 alert(kind + ": " + arg);
adamc@729 69 for (; ls; ls = ls.next)
adamc@729 70 try {
adamc@729 71 ls.data(arg)(null);
adamc@729 72 } catch (v) { }
adamc@729 73 }
adamc@729 74
adamc@729 75 var errorHandlers = null;
adamc@729 76
adamc@729 77 function onError(f) {
adamc@729 78 errorHandlers = cons(f, errorHandlers);
adamc@729 79 }
adamc@729 80
adamc@729 81 function er(s) {
adamc@798 82 runHandlers("Error", errorHandlers, s);
adamc@729 83 throw {uw_error: s};
adamc@729 84 }
adamc@729 85
adamc@729 86 var failHandlers = null;
adamc@729 87
adamc@729 88 function onFail(f) {
adamc@729 89 failHandlers = cons(f, failHandlers);
adamc@729 90 }
adamc@729 91
adamc@729 92 function doExn(v) {
adamc@729 93 if (v == null || v.uw_error == null) {
adamc@729 94 var s = (v == null ? "null" : v.toString());
adamc@969 95 if (v != null && v.fileName && v.lineNumber)
adamc@969 96 s += " (" + v.fileName + ":" + v.lineNumber + ")";
adamc@798 97 runHandlers("Fail", failHandlers, s);
adamc@729 98 }
adamc@729 99 }
adamc@729 100
adamc@729 101 var disconnectHandlers = null;
adamc@729 102
adamc@729 103 function onDisconnect(f) {
adamc@729 104 disconnectHandlers = cons(function (_){return f}, disconnectHandlers);
adamc@729 105 }
adamc@729 106
adamc@729 107 function discon() {
adamc@798 108 runHandlers("Disconnect", disconnectHandlers, null);
adamc@729 109 }
adamc@729 110
adamc@729 111 var connectHandlers = null;
adamc@729 112
adamc@729 113 function onConnectFail(f) {
adamc@729 114 connectHandlers = cons(function (_){return f}, connectHandlers);
adamc@729 115 }
adamc@729 116
adamc@729 117 function conn() {
adamc@798 118 runHandlers("Connect", connectHandlers, null);
adamc@729 119 }
adamc@729 120
adamc@729 121 var serverHandlers = null;
adamc@729 122
adamc@729 123 function onServerError(f) {
adamc@729 124 serverHandlers = cons(f, serverHandlers);
adamc@729 125 }
adamc@729 126
adamc@729 127 function servErr(s) {
adamc@824 128 window.setTimeout(function () { runHandlers("Server", serverHandlers, s); }, 0);
adamc@729 129 }
adamc@729 130
adamc@729 131
adamc@692 132 // Embedding closures in XML strings
adamc@692 133
adamc@693 134 function cs(f) {
adamc@693 135 return {closure: f};
adamc@693 136 }
adamc@693 137
adamc@693 138 function isWeird(v) {
adamc@693 139 return v.closure != null || v.cat1 != null;
adamc@693 140 }
adamc@693 141
adamc@692 142 function cat(s1, s2) {
adamc@693 143 if (isWeird(s1) || isWeird(s2))
adamc@693 144 return {cat1: s1, cat2: s2};
adamc@693 145 else
adamc@692 146 return s1 + s2;
adamc@692 147 }
adamc@692 148
adamc@692 149 var closures = [];
adamc@703 150 var freeClosures = null;
adamc@692 151
adamc@692 152 function newClosure(f) {
adamc@703 153 var n;
adamc@703 154 if (freeClosures == null) {
adamc@703 155 n = closures.length;
adamc@703 156 } else {
adamc@703 157 n = freeClosures.data;
adamc@703 158 freeClosures = freeClosures.next;
adamc@703 159 }
adamc@692 160 closures[n] = f;
adamc@692 161 return n;
adamc@692 162 }
adamc@692 163
adamc@703 164 function freeClosure(n) {
adamc@703 165 closures[n] = null;
adamc@703 166 freeClosures = cons(n, freeClosures);
adamc@703 167 }
adamc@703 168
adamc@692 169 function cr(n) {
adamc@692 170 return closures[n]();
adamc@692 171 }
adamc@692 172
adamc@703 173 function flatten(cls, tr) {
adamc@693 174 if (tr.cat1 != null)
adamc@703 175 return flatten(cls, tr.cat1) + flatten(cls, tr.cat2);
adamc@703 176 else if (tr.closure != null) {
adamc@703 177 var cl = newClosure(tr.closure);
adamc@703 178 cls.v = cons(cl, cls.v);
adamc@703 179 return "cr(" + cl + ")";
adamc@703 180 } else
adamc@692 181 return tr;
adamc@692 182 }
adamc@692 183
adamc@728 184 function flattenLocal(s) {
adamc@728 185 var cls = {v : null};
adamc@728 186 var r = flatten(cls, s);
adamc@728 187 for (cl = cls.v; cl != null; cl = cl.next)
adamc@728 188 freeClosure(cl.data);
adamc@728 189 return r;
adamc@728 190 }
adamc@728 191
adamc@692 192
adamc@692 193
adamc@692 194 // Dynamic tree management
adamc@692 195
adamc@690 196 function populate(node) {
adamc@690 197 var s = node.signal;
adamc@690 198 var oldSources = node.sources;
adamc@729 199 try {
adamc@729 200 var sr = s();
adamc@729 201 var newSources = sr.sources;
adamc@690 202
adamc@729 203 for (var sp = oldSources; sp; sp = sp.next)
adamc@729 204 if (!member(sp.data, newSources))
adamc@729 205 sp.data.dyns = remove(node, sp.data.dyns);
adamc@690 206
adamc@729 207 for (var sp = newSources; sp; sp = sp.next)
adamc@729 208 if (!member(sp.data, oldSources))
adamc@729 209 sp.data.dyns = cons(node, sp.data.dyns);
adamc@690 210
adamc@729 211 node.sources = newSources;
adamc@729 212 node.recreate(sr.data);
adamc@729 213 } catch (v) {
adamc@729 214 doExn(v);
adamc@729 215 }
adamc@579 216 }
adamc@574 217
adamc@580 218 function sc(v) {
adamc@690 219 return {data : v, dyns : null};
adamc@580 220 }
adamc@580 221 function sv(s, v) {
adamc@690 222 s.data = v;
adamc@967 223
adamc@690 224 for (var ls = s.dyns; ls; ls = ls.next)
adamc@690 225 if (!ls.dead)
adamc@690 226 populate(ls.data);
adamc@580 227 }
adamc@601 228 function sg(s) {
adamc@690 229 return s.data;
adamc@601 230 }
adamc@579 231
adamc@580 232 function ss(s) {
adamc@690 233 return function() { return {sources : cons(s, null), data : s.data } };
adamc@580 234 }
adamc@580 235 function sr(v) {
adamc@690 236 return function() { return {sources : null, data : v } };
adamc@580 237 }
adamc@580 238 function sb(x,y) {
adamc@690 239 return function() {
adamc@690 240 var xr = x();
adamc@690 241 var yr = y(xr.data)();
adamc@690 242 return {sources : union(xr.sources, yr.sources), data : yr.data};
adamc@690 243 };
adamc@580 244 }
adamc@841 245 function scur(s) {
adamc@841 246 return s().data;
adamc@841 247 }
adamc@571 248
adamc@604 249 function lastParent() {
adamc@604 250 var pos = document;
adamc@604 251
adamc@600 252 while (pos.lastChild && pos.lastChild.nodeType == 1)
adamc@600 253 pos = pos.lastChild;
adamc@600 254
adamc@600 255 return pos.parentNode;
adamc@600 256 }
adamc@600 257
adamc@898 258 function parent() {
adamc@898 259 return thisScript ? thisScript.parentNode : lastParent();
adamc@898 260 }
adamc@898 261
adamc@604 262 function addNode(node) {
adamc@899 263 if (thisScript)
adamc@899 264 thisScript.parentNode.replaceChild(node, thisScript);
adamc@899 265 else
adamc@604 266 lastParent().appendChild(node);
adamc@603 267 }
adamc@603 268
adamc@690 269 var thisScript = null;
adamc@690 270
adamc@604 271 function runScripts(node) {
adamc@899 272 if (node.getElementsByTagName) {
adamc@899 273 var savedScript = thisScript;
adamc@603 274
adamc@899 275 var scripts = node.getElementsByTagName("script"), scriptsCopy = [];
adamc@899 276 var len = scripts.length;
adamc@899 277 for (var i = 0; i < len; ++i)
adamc@899 278 scriptsCopy[i] = scripts[i];
adamc@899 279 for (var i = 0; i < len; ++i) {
adamc@899 280 thisScript = scriptsCopy[i];
adamc@899 281 try {
adamc@899 282 eval(thisScript.textContent);
adamc@899 283 } catch (v) {
adamc@899 284 doExn(v);
adamc@899 285 }
adamc@899 286 if (thisScript.parentNode)
adamc@901 287 thisScript.parentNode.removeChild(thisScript);
adamc@729 288 }
adamc@899 289
adamc@899 290 thisScript = savedScript;
adamc@604 291 }
adamc@603 292 }
adamc@603 293
adamc@603 294
adamc@692 295 // Dynamic tree entry points
adamc@692 296
adamc@967 297 function killScript(scr) {
adamc@967 298 scr.dead = true;
adamc@967 299 for (var ls = scr.sources; ls; ls = ls.next)
adamc@967 300 ls.data.dyns = remove(scr, ls.data.dyns);
adamc@967 301 for (var ls = scr.closures; ls; ls = ls.next)
adamc@967 302 freeClosure(ls.data);
adamc@967 303 }
adamc@967 304
adamc@901 305 function dyn(pnode, s) {
adamc@901 306 var x = document.createElement("script");
adamc@690 307 x.dead = false;
adamc@690 308 x.signal = s;
adamc@690 309 x.sources = null;
adamc@703 310 x.closures = null;
adamc@899 311
adamc@902 312 var firstChild = null;
adamc@899 313
adamc@690 314 x.recreate = function(v) {
adamc@703 315 for (var ls = x.closures; ls; ls = ls.next)
adamc@703 316 freeClosure(ls.data);
adamc@692 317
adamc@902 318 var next;
adamc@902 319 for (var child = firstChild; child && child != x; child = next) {
adamc@902 320 next = child.nextSibling;
adamc@967 321 killScript(child);
adamc@901 322 if (child.getElementsByTagName) {
adamc@901 323 var arr = child.getElementsByTagName("script");
adamc@967 324 for (var i = 0; i < arr.length; ++i)
adamc@967 325 killScript(arr[i]);
adamc@847 326 }
adamc@847 327
adamc@901 328 if (child.parentNode)
adamc@901 329 child.parentNode.removeChild(child);
adamc@899 330 }
adamc@690 331
adamc@703 332 var cls = {v : null};
adamc@901 333 var html = flatten(cls, v);
adamc@703 334 x.closures = cls.v;
adamc@899 335
adamc@901 336 if (pnode == "table") {
adamc@901 337 var dummy = document.createElement("body");
adamc@901 338 dummy.innerHTML = "<table>" + html + "</table>";
adamc@901 339 runScripts(dummy);
adamc@901 340 var table = x.parentNode;
adamc@901 341
adamc@946 342 if (table) {
adamc@946 343 var arr = dummy.getElementsByTagName("tbody");
adamc@946 344 firstChild = null;
adamc@946 345 var tbody;
adamc@946 346 if (arr.length > 0 && table != null)
adamc@946 347 tbody = arr[0];
adamc@946 348 else
adamc@946 349 tbody = dummy.firstChild;
adamc@945 350
adamc@946 351 var next;
adamc@946 352 firstChild = document.createElement("script");
adamc@946 353 table.insertBefore(firstChild, x);
adamc@946 354 for (var node = tbody.firstChild; node; node = next) {
adamc@946 355 next = node.nextSibling;
adamc@946 356 table.insertBefore(node, x);
adamc@946 357 }
adamc@901 358 }
adamc@903 359 } else if (pnode == "tr") {
adamc@903 360 var dummy = document.createElement("body");
adamc@903 361 dummy.innerHTML = "<table><tr>" + html + "</tr></table>";
adamc@903 362 runScripts(dummy);
adamc@903 363 var table = x.parentNode;
adamc@903 364
adamc@946 365 if (table) {
adamc@946 366 var arr = dummy.getElementsByTagName("tr");
adamc@946 367 firstChild = null;
adamc@946 368 var tbody;
adamc@946 369 if (arr.length > 0 && table != null)
adamc@946 370 tbody = arr[0];
adamc@946 371 else
adamc@946 372 tbody = dummy.firstChild;
adamc@946 373
adamc@946 374 var next;
adamc@903 375 firstChild = document.createElement("script");
adamc@903 376 table.insertBefore(firstChild, x);
adamc@903 377 for (var node = tbody.firstChild; node; node = next) {
adamc@903 378 next = node.nextSibling;
adamc@903 379 table.insertBefore(node, x);
adamc@903 380 }
adamc@903 381 }
adamc@901 382 } else {
adamc@902 383 firstChild = document.createElement("span");
adamc@902 384 firstChild.innerHTML = html;
adamc@902 385 runScripts(firstChild);
adamc@900 386 if (x.parentNode)
adamc@902 387 x.parentNode.insertBefore(firstChild, x);
adamc@899 388 }
adamc@690 389 };
adamc@899 390
adamc@899 391 addNode(x);
adamc@690 392 populate(x);
adamc@571 393 }
adamc@582 394
adamc@817 395 function input(t, s, recreate) {
adamc@598 396 var x = document.createElement(t);
adamc@690 397 x.dead = false;
adamc@690 398 x.signal = ss(s);
adamc@690 399 x.sources = null;
adamc@817 400 x.recreate = recreate(x);
adamc@899 401 addNode(x);
adamc@690 402 populate(x);
adamc@816 403
adamc@816 404 return x;
adamc@816 405 }
adamc@816 406
adamc@816 407 function inp(s) {
adamc@817 408 var x = input("input", s, function(x) { return function(v) { if (x.value != v) x.value = v; }; });
adamc@816 409 x.value = s.data;
adamc@816 410 x.onkeyup = function() { sv(s, x.value) };
adamc@816 411
adamc@816 412 return x;
adamc@816 413 }
adamc@816 414
adamc@816 415 function sel(s, content) {
adamc@817 416 var x = input("select", s, function(x) { return function(v) { if (x.value != v) x.value = v; }; });
adamc@816 417 x.innerHTML = content;
adamc@816 418 x.value = s.data;
adamc@835 419 if (x.value != s.data)
adamc@835 420 sv(s, x.value);
adamc@816 421 x.onchange = function() { sv(s, x.value) };
adamc@797 422
adamc@606 423 return x;
adamc@598 424 }
adamc@598 425
adamc@817 426 function chk(s) {
adamc@817 427 var x = input("input", s, function(x) { return function(v) { if (x.checked != v) x.checked = v; }; });
adamc@817 428 x.type = "checkbox";
adamc@817 429 x.checked = s.data;
adamc@817 430 x.onchange = function() { sv(s, x.checked) };
adamc@817 431
adamc@817 432 return x;
adamc@817 433 }
adamc@817 434
adamc@800 435 function addOnChange(x, f) {
adamc@800 436 var old = x.onchange;
adamc@800 437 x.onchange = function() { old(); f (); };
adamc@800 438 }
adamc@800 439
adamc@692 440
adamc@692 441 // Basic string operations
adamc@692 442
adamc@597 443 function eh(x) {
adamc@800 444 if (x == null)
adamc@800 445 return "NULL";
adamc@800 446 else
adamc@800 447 return x.split("&").join("&amp;").split("<").join("&lt;").split(">").join("&gt;");
adamc@597 448 }
adamc@597 449
adamc@582 450 function ts(x) { return x.toString() }
adamc@586 451 function bs(b) { return (b ? "True" : "False") }
adamc@586 452
adamc@828 453 function sub(s, i) { return s[i]; }
adamc@828 454 function suf(s, i) { return s.substring(i); }
adamc@828 455 function slen(s) { return s.length; }
adamc@829 456 function sidx(s, ch) {
adamc@829 457 var r = s.indexOf(ch);
adamc@829 458 if (r == -1)
adamc@829 459 return null;
adamc@829 460 else
adamc@829 461 return r;
adamc@829 462 }
adamc@831 463 function sspn(s, chs) {
adamc@831 464 for (var i = 0; i < s.length; ++i)
adamc@831 465 if (chs.indexOf(s[i]) != -1)
adamc@831 466 return i;
adamc@831 467
adamc@831 468 return null;
adamc@831 469 }
adamc@829 470 function schr(s, ch) {
adamc@829 471 var r = s.indexOf(ch);
adamc@829 472 if (r == -1)
adamc@829 473 return null;
adamc@829 474 else
adamc@829 475 return s.substring(r);
adamc@829 476 }
adamc@829 477 function ssub(s, start, len) {
adamc@829 478 return s.substring(start, start+len);
adamc@829 479 }
adamc@821 480
adamc@649 481 function pi(s) {
adamc@649 482 var r = parseInt(s);
adamc@649 483 if (r.toString() == s)
adamc@649 484 return r;
adamc@649 485 else
adamc@729 486 er("Can't parse int: " + s);
adamc@649 487 }
adamc@649 488
adamc@649 489 function pfl(s) {
adamc@649 490 var r = parseFloat(s);
adamc@649 491 if (r.toString() == s)
adamc@649 492 return r;
adamc@649 493 else
adamc@729 494 er("Can't parse float: " + s);
adamc@649 495 }
adamc@649 496
adamc@838 497 function pio(s) {
adamc@838 498 var r = parseInt(s);
adamc@838 499 if (r.toString() == s)
adamc@838 500 return r;
adamc@838 501 else
adamc@838 502 return null;
adamc@838 503 }
adamc@838 504
adamc@838 505 function pflo(s) {
adamc@838 506 var r = parseFloat(s);
adamc@838 507 if (r.toString() == s)
adamc@838 508 return r;
adamc@838 509 else
adamc@838 510 return null;
adamc@838 511 }
adamc@838 512
adamc@692 513 function uf(s) {
adamc@925 514 if (s.length == 0)
adamc@925 515 return "_";
adamc@925 516 return (s[0] == '_' ? "_" : "")
adamc@925 517 + escape(s).replace(new RegExp ("/", "g"), "%2F").replace(new RegExp ("\\+", "g"), "%2B");
adamc@691 518 }
adamc@691 519
adamc@692 520 function uu(s) {
adamc@925 521 if (s.length > 0 && s[0] == '_')
adamc@925 522 s = s.substring(1);
adamc@927 523 else if (s.length >= 3 && s[0] == '%' && s[1] == '5' && (s[2] == 'f' || s[2] == 'F'))
adamc@927 524 s = s.substring(3);
adamc@905 525 return unescape(s.replace(new RegExp ("\\+", "g"), " "));
adamc@905 526 }
adamc@905 527
adamc@912 528 function ub(b) {
adamc@912 529 return b ? "1" : "0";
adamc@912 530 }
adamc@912 531
adamc@905 532 function uul(getToken, getData) {
adamc@905 533 var tok = getToken();
adamc@905 534 if (tok == "Nil") {
adamc@905 535 return null;
adamc@905 536 } else if (tok == "Cons") {
adamc@905 537 var d = getData();
adamc@905 538 var l = uul(getToken, getData);
adamc@905 539 return {_1:d, _2:l};
adamc@905 540 } else
adamc@905 541 throw ("Can't unmarshal list (" + tok + ")");
adamc@692 542 }
adamc@692 543
adamc@961 544 function strcmp(str1, str2) {
adamc@961 545 return ((str1 == str2) ? 0 : ((str1 > str2) ? 1 : -1));
adamc@961 546 }
adamc@692 547
adamc@603 548
adamc@692 549 // Remote calls
adamc@609 550
adamc@703 551 var client_id = null;
adamc@668 552 var client_pass = 0;
adamc@668 553 var url_prefix = "/";
adamc@673 554 var timeout = 60;
adamc@668 555
adamc@668 556 function getXHR(uri)
adamc@609 557 {
adamc@609 558 try {
adamc@609 559 return new XMLHttpRequest();
adamc@609 560 } catch (e) {
adamc@609 561 try {
adamc@609 562 return new ActiveXObject("Msxml2.XMLHTTP");
adamc@609 563 } catch (e) {
adamc@609 564 try {
adamc@609 565 return new ActiveXObject("Microsoft.XMLHTTP");
adamc@609 566 } catch (e) {
adamc@609 567 throw "Your browser doesn't seem to support AJAX.";
adamc@609 568 }
adamc@609 569 }
adamc@609 570 }
adamc@609 571 }
adamc@609 572
adamc@736 573 var sig = null;
adamc@736 574
adamc@736 575 function requestUri(xhr, uri, needsSig) {
adamc@668 576 xhr.open("GET", uri, true);
adamc@668 577
adamc@703 578 if (client_id != null) {
adamc@668 579 xhr.setRequestHeader("UrWeb-Client", client_id.toString());
adamc@668 580 xhr.setRequestHeader("UrWeb-Pass", client_pass.toString());
adamc@668 581 }
adamc@668 582
adamc@736 583 if (needsSig) {
adamc@736 584 if (sig == null)
adamc@736 585 whine("Missing cookie signature!");
adamc@736 586
adamc@736 587 xhr.setRequestHeader("UrWeb-Sig", sig);
adamc@736 588 }
adamc@736 589
adamc@668 590 xhr.send(null);
adamc@668 591 }
adamc@668 592
adamc@736 593 function rc(uri, parse, k, needsSig) {
adamc@728 594 uri = flattenLocal(uri);
adamc@609 595 var xhr = getXHR();
adamc@609 596
adamc@609 597 xhr.onreadystatechange = function() {
adamc@612 598 if (xhr.readyState == 4) {
adamc@612 599 var isok = false;
adamc@612 600
adamc@612 601 try {
adamc@612 602 if (xhr.status == 200)
adamc@612 603 isok = true;
adamc@612 604 } catch (e) { }
adamc@612 605
adamc@729 606 if (isok) {
adamc@729 607 try {
adamc@729 608 k(parse(xhr.responseText));
adamc@729 609 } catch (v) {
adamc@729 610 doExn(v);
adamc@729 611 }
adamc@729 612 } else {
adamc@729 613 conn();
adamc@649 614 }
adamc@612 615 }
adamc@609 616 };
adamc@609 617
adamc@736 618 requestUri(xhr, uri, needsSig);
adamc@609 619 }
adamc@667 620
adamc@667 621 function path_join(s1, s2) {
adamc@667 622 if (s1.length > 0 && s1[s1.length-1] == '/')
adamc@667 623 return s1 + s2;
adamc@667 624 else
adamc@667 625 return s1 + "/" + s2;
adamc@667 626 }
adamc@667 627
adamc@670 628 var channels = [];
adamc@670 629
adamc@670 630 function newQueue() {
adamc@670 631 return { front : null, back : null };
adamc@670 632 }
adamc@670 633 function enqueue(q, v) {
adamc@670 634 if (q.front == null) {
adamc@670 635 q.front = cons(v, null);
adamc@670 636 q.back = q.front;
adamc@670 637 } else {
adamc@670 638 var node = cons(v, null);
adamc@690 639 q.back.next = node;
adamc@670 640 q.back = node;
adamc@670 641 }
adamc@670 642 }
adamc@670 643 function dequeue(q) {
adamc@670 644 if (q.front == null)
adamc@670 645 return null;
adamc@670 646 else {
adamc@690 647 var r = q.front.data;
adamc@690 648 q.front = q.front.next;
adamc@670 649 if (q.front == null)
adamc@670 650 q.back = null;
adamc@670 651 return r;
adamc@670 652 }
adamc@670 653 }
adamc@670 654
adamc@670 655 function newChannel() {
adamc@670 656 return { msgs : newQueue(), listeners : newQueue() };
adamc@670 657 }
adamc@670 658
adamc@667 659 function listener() {
adamc@668 660 var uri = path_join(url_prefix, ".msgs");
adamc@667 661 var xhr = getXHR();
adamc@673 662 var tid, orsc, onTimeout;
adamc@673 663
adamc@673 664 var connect = function () {
adamc@673 665 xhr.onreadystatechange = orsc;
adamc@673 666 tid = window.setTimeout(onTimeout, timeout * 500);
adamc@736 667 requestUri(xhr, uri, false);
adamc@673 668 }
adamc@673 669
adamc@673 670 orsc = function() {
adamc@667 671 if (xhr.readyState == 4) {
adamc@673 672 window.clearTimeout(tid);
adamc@673 673
adamc@667 674 var isok = false;
adamc@667 675
adamc@667 676 try {
adamc@667 677 if (xhr.status == 200)
adamc@667 678 isok = true;
adamc@667 679 } catch (e) { }
adamc@667 680
adamc@668 681 if (isok) {
adamc@889 682 var text = xhr.responseText
adamc@889 683 if (text == "")
adamc@889 684 return;
adamc@889 685 var lines = text.split("\n");
adamc@889 686
adamc@729 687 if (lines.length < 2) {
adamc@729 688 discon();
adamc@729 689 return;
adamc@729 690 }
adamc@669 691
adamc@669 692 for (var i = 0; i+1 < lines.length; i += 2) {
adamc@670 693 var chn = lines[i];
adamc@670 694 var msg = lines[i+1];
adamc@670 695
adamc@670 696 if (chn < 0)
adamc@670 697 whine("Out-of-bounds channel in message from remote server");
adamc@670 698
adamc@670 699 var ch;
adamc@670 700
adamc@670 701 if (chn >= channels.length || channels[chn] == null) {
adamc@670 702 ch = newChannel();
adamc@670 703 channels[chn] = ch;
adamc@670 704 } else
adamc@670 705 ch = channels[chn];
adamc@670 706
adamc@670 707 var listener = dequeue(ch.listeners);
adamc@670 708 if (listener == null) {
adamc@670 709 enqueue(ch.msgs, msg);
adamc@670 710 } else {
adamc@728 711 try {
adamc@728 712 listener(msg);
adamc@728 713 } catch (v) {
adamc@728 714 doExn(v);
adamc@728 715 }
adamc@670 716 }
adamc@669 717 }
adamc@669 718
adamc@673 719 connect();
adamc@668 720 }
adamc@667 721 else {
adamc@729 722 try {
adamc@824 723 if (xhr.status != 0)
adamc@824 724 servErr("Error querying remote server for messages: " + xhr.status);
adamc@889 725 } catch (e) { }
adamc@667 726 }
adamc@667 727 }
adamc@667 728 };
adamc@667 729
adamc@673 730 onTimeout = function() {
adamc@673 731 xhr.abort();
adamc@673 732 connect();
adamc@673 733 };
adamc@673 734
adamc@673 735 connect();
adamc@667 736 }
adamc@670 737
adamc@670 738 function rv(chn, parse, k) {
adamc@682 739 if (chn == null)
adamc@682 740 return;
adamc@682 741
adamc@670 742 if (chn < 0)
adamc@670 743 whine("Out-of-bounds channel receive");
adamc@670 744
adamc@670 745 var ch;
adamc@670 746
adamc@670 747 if (chn >= channels.length || channels[chn] == null) {
adamc@670 748 ch = newChannel();
adamc@670 749 channels[chn] = ch;
adamc@670 750 } else
adamc@670 751 ch = channels[chn];
adamc@670 752
adamc@670 753 var msg = dequeue(ch.msgs);
adamc@670 754 if (msg == null) {
adamc@670 755 enqueue(ch.listeners, function(msg) { k(parse(msg))(null); });
adamc@670 756 } else {
adamc@728 757 try {
adamc@728 758 k(parse(msg))(null);
adamc@728 759 } catch (v) {
adamc@728 760 doExn(v);
adamc@728 761 }
adamc@670 762 }
adamc@670 763 }
adamc@693 764
adamc@693 765
adamc@895 766 // Key events
adamc@895 767
adamc@895 768 function kc(e) {
adamc@895 769 return window.event ? e.keyCode : e.which;
adamc@895 770 }
adamc@895 771
adamc@895 772
adamc@693 773 // App-specific code
adamc@693 774