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annotate lib/js/urweb.js @ 819:cb30dd2ba353

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Switch to Maranget's pattern exhaustiveness algorithm
author Adam Chlipala <adamc@hcoop.net>
date Sat, 23 May 2009 09:45:02 -0400
parents 4585f744574a
children 395a5d450cc0
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@810 34 whine("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@798 97 runHandlers("Server", serverHandlers, s);
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@571 213
adamc@604 214 function lastParent() {
adamc@604 215 var pos = document;
adamc@604 216
adamc@600 217 while (pos.lastChild && pos.lastChild.nodeType == 1)
adamc@600 218 pos = pos.lastChild;
adamc@600 219
adamc@600 220 return pos.parentNode;
adamc@600 221 }
adamc@600 222
adamc@604 223 function addNode(node) {
adamc@604 224 if (thisScript) {
adamc@604 225 thisScript.parentNode.appendChild(node);
adamc@604 226 thisScript.parentNode.removeChild(thisScript);
adamc@604 227 } else
adamc@604 228 lastParent().appendChild(node);
adamc@603 229 }
adamc@603 230
adamc@812 231 function setHTML(html) {
adamc@812 232 var x = document.createElement("span");
adamc@812 233 x.dead = false;
adamc@812 234 x.signal = null;
adamc@812 235 x.sources = null;
adamc@812 236 x.closures = null;
adamc@812 237 x.innerHTML = html;
adamc@812 238 addNode(x);
adamc@812 239 runScripts(x);
adamc@812 240 alert("HTML:\n" + html);
adamc@812 241 }
adamc@812 242
adamc@690 243 var thisScript = null;
adamc@690 244
adamc@604 245 function runScripts(node) {
adamc@604 246 var savedScript = thisScript;
adamc@603 247
adamc@692 248 var scripts = node.getElementsByTagName("script"), scriptsCopy = [];
adamc@604 249 var len = scripts.length;
adamc@646 250 for (var i = 0; i < len; ++i)
adamc@646 251 scriptsCopy[i] = scripts[i];
adamc@604 252 for (var i = 0; i < len; ++i) {
adamc@646 253 thisScript = scriptsCopy[i];
adamc@729 254 try {
adamc@729 255 eval(thisScript.textContent);
adamc@729 256 } catch (v) {
adamc@729 257 doExn(v);
adamc@729 258 }
adamc@604 259 }
adamc@604 260
adamc@604 261 thisScript = savedScript;
adamc@603 262 }
adamc@603 263
adamc@603 264
adamc@692 265 // Dynamic tree entry points
adamc@692 266
adamc@692 267 var dynDepth = 0;
adamc@692 268
adamc@571 269 function dyn(s) {
adamc@571 270 var x = document.createElement("span");
adamc@690 271 x.dead = false;
adamc@690 272 x.signal = s;
adamc@690 273 x.sources = null;
adamc@703 274 x.closures = null;
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@690 279 var spans = x.getElementsByTagName("span");
adamc@690 280 for (var i = 0; i < spans.length; ++i) {
adamc@690 281 var span = spans[i];
adamc@690 282 span.dead = true;
adamc@690 283 for (var ls = span.sources; ls; ls = ls.next)
adamc@690 284 ls.data.dyns = remove(span, ls.data.dyns);
adamc@703 285 for (var ls = span.closures; ls; ls = ls.next)
adamc@703 286 freeClosure(ls.data);
adamc@690 287 }
adamc@690 288
adamc@703 289 var cls = {v : null};
adamc@703 290 x.innerHTML = flatten(cls, v);
adamc@703 291 x.closures = cls.v;
adamc@690 292 runScripts(x);
adamc@690 293 };
adamc@703 294 addNode(x);
adamc@690 295 populate(x);
adamc@571 296 }
adamc@582 297
adamc@817 298 function input(t, s, recreate) {
adamc@598 299 var x = document.createElement(t);
adamc@690 300 x.dead = false;
adamc@690 301 x.signal = ss(s);
adamc@690 302 x.sources = null;
adamc@817 303 x.recreate = recreate(x);
adamc@690 304 populate(x);
adamc@604 305 addNode(x);
adamc@816 306
adamc@816 307 return x;
adamc@816 308 }
adamc@816 309
adamc@816 310 function inp(s) {
adamc@817 311 var x = input("input", s, function(x) { return function(v) { if (x.value != v) x.value = v; }; });
adamc@816 312 x.value = s.data;
adamc@816 313 x.onkeyup = function() { sv(s, x.value) };
adamc@816 314
adamc@816 315 return x;
adamc@816 316 }
adamc@816 317
adamc@816 318 function sel(s, content) {
adamc@817 319 var x = input("select", s, function(x) { return function(v) { if (x.value != v) x.value = v; }; });
adamc@816 320 x.innerHTML = content;
adamc@816 321 x.value = s.data;
adamc@816 322 x.onchange = function() { sv(s, x.value) };
adamc@797 323
adamc@606 324 return x;
adamc@598 325 }
adamc@598 326
adamc@817 327 function chk(s) {
adamc@817 328 var x = input("input", s, function(x) { return function(v) { if (x.checked != v) x.checked = v; }; });
adamc@817 329 x.type = "checkbox";
adamc@817 330 x.checked = s.data;
adamc@817 331 x.onchange = function() { sv(s, x.checked) };
adamc@817 332
adamc@817 333 return x;
adamc@817 334 }
adamc@817 335
adamc@800 336 function addOnChange(x, f) {
adamc@800 337 var old = x.onchange;
adamc@800 338 x.onchange = function() { old(); f (); };
adamc@800 339 }
adamc@800 340
adamc@692 341
adamc@692 342 // Basic string operations
adamc@692 343
adamc@597 344 function eh(x) {
adamc@800 345 if (x == null)
adamc@800 346 return "NULL";
adamc@800 347 else
adamc@800 348 return x.split("&").join("&amp;").split("<").join("&lt;").split(">").join("&gt;");
adamc@597 349 }
adamc@597 350
adamc@582 351 function ts(x) { return x.toString() }
adamc@586 352 function bs(b) { return (b ? "True" : "False") }
adamc@586 353
adamc@649 354 function pi(s) {
adamc@649 355 var r = parseInt(s);
adamc@649 356 if (r.toString() == s)
adamc@649 357 return r;
adamc@649 358 else
adamc@729 359 er("Can't parse int: " + s);
adamc@649 360 }
adamc@649 361
adamc@649 362 function pfl(s) {
adamc@649 363 var r = parseFloat(s);
adamc@649 364 if (r.toString() == s)
adamc@649 365 return r;
adamc@649 366 else
adamc@729 367 er("Can't parse float: " + s);
adamc@649 368 }
adamc@649 369
adamc@692 370 function uf(s) {
adamc@692 371 return escape(s).replace(new RegExp ("/", "g"), "%2F");
adamc@691 372 }
adamc@691 373
adamc@692 374 function uu(s) {
adamc@692 375 return unescape(s).replace(new RegExp ("\\+", "g"), " ");
adamc@692 376 }
adamc@692 377
adamc@692 378
adamc@603 379
adamc@692 380 // Remote calls
adamc@609 381
adamc@703 382 var client_id = null;
adamc@668 383 var client_pass = 0;
adamc@668 384 var url_prefix = "/";
adamc@673 385 var timeout = 60;
adamc@668 386
adamc@668 387 function getXHR(uri)
adamc@609 388 {
adamc@609 389 try {
adamc@609 390 return new XMLHttpRequest();
adamc@609 391 } catch (e) {
adamc@609 392 try {
adamc@609 393 return new ActiveXObject("Msxml2.XMLHTTP");
adamc@609 394 } catch (e) {
adamc@609 395 try {
adamc@609 396 return new ActiveXObject("Microsoft.XMLHTTP");
adamc@609 397 } catch (e) {
adamc@609 398 throw "Your browser doesn't seem to support AJAX.";
adamc@609 399 }
adamc@609 400 }
adamc@609 401 }
adamc@609 402 }
adamc@609 403
adamc@736 404 var sig = null;
adamc@736 405
adamc@736 406 function requestUri(xhr, uri, needsSig) {
adamc@668 407 xhr.open("GET", uri, true);
adamc@668 408
adamc@703 409 if (client_id != null) {
adamc@668 410 xhr.setRequestHeader("UrWeb-Client", client_id.toString());
adamc@668 411 xhr.setRequestHeader("UrWeb-Pass", client_pass.toString());
adamc@668 412 }
adamc@668 413
adamc@736 414 if (needsSig) {
adamc@736 415 if (sig == null)
adamc@736 416 whine("Missing cookie signature!");
adamc@736 417
adamc@736 418 xhr.setRequestHeader("UrWeb-Sig", sig);
adamc@736 419 }
adamc@736 420
adamc@668 421 xhr.send(null);
adamc@668 422 }
adamc@668 423
adamc@736 424 function rc(uri, parse, k, needsSig) {
adamc@728 425 uri = flattenLocal(uri);
adamc@609 426 var xhr = getXHR();
adamc@609 427
adamc@609 428 xhr.onreadystatechange = function() {
adamc@612 429 if (xhr.readyState == 4) {
adamc@612 430 var isok = false;
adamc@612 431
adamc@612 432 try {
adamc@612 433 if (xhr.status == 200)
adamc@612 434 isok = true;
adamc@612 435 } catch (e) { }
adamc@612 436
adamc@729 437 if (isok) {
adamc@729 438 try {
adamc@729 439 k(parse(xhr.responseText));
adamc@729 440 } catch (v) {
adamc@729 441 doExn(v);
adamc@729 442 }
adamc@729 443 } else {
adamc@729 444 conn();
adamc@649 445 }
adamc@612 446 }
adamc@609 447 };
adamc@609 448
adamc@736 449 requestUri(xhr, uri, needsSig);
adamc@609 450 }
adamc@667 451
adamc@667 452 function path_join(s1, s2) {
adamc@667 453 if (s1.length > 0 && s1[s1.length-1] == '/')
adamc@667 454 return s1 + s2;
adamc@667 455 else
adamc@667 456 return s1 + "/" + s2;
adamc@667 457 }
adamc@667 458
adamc@670 459 var channels = [];
adamc@670 460
adamc@670 461 function newQueue() {
adamc@670 462 return { front : null, back : null };
adamc@670 463 }
adamc@670 464 function enqueue(q, v) {
adamc@670 465 if (q.front == null) {
adamc@670 466 q.front = cons(v, null);
adamc@670 467 q.back = q.front;
adamc@670 468 } else {
adamc@670 469 var node = cons(v, null);
adamc@690 470 q.back.next = node;
adamc@670 471 q.back = node;
adamc@670 472 }
adamc@670 473 }
adamc@670 474 function dequeue(q) {
adamc@670 475 if (q.front == null)
adamc@670 476 return null;
adamc@670 477 else {
adamc@690 478 var r = q.front.data;
adamc@690 479 q.front = q.front.next;
adamc@670 480 if (q.front == null)
adamc@670 481 q.back = null;
adamc@670 482 return r;
adamc@670 483 }
adamc@670 484 }
adamc@670 485
adamc@670 486 function newChannel() {
adamc@670 487 return { msgs : newQueue(), listeners : newQueue() };
adamc@670 488 }
adamc@670 489
adamc@667 490 function listener() {
adamc@668 491 var uri = path_join(url_prefix, ".msgs");
adamc@667 492 var xhr = getXHR();
adamc@673 493 var tid, orsc, onTimeout;
adamc@673 494
adamc@673 495 var connect = function () {
adamc@673 496 xhr.onreadystatechange = orsc;
adamc@673 497 tid = window.setTimeout(onTimeout, timeout * 500);
adamc@736 498 requestUri(xhr, uri, false);
adamc@673 499 }
adamc@673 500
adamc@673 501 orsc = function() {
adamc@667 502 if (xhr.readyState == 4) {
adamc@673 503 window.clearTimeout(tid);
adamc@673 504
adamc@667 505 var isok = false;
adamc@667 506
adamc@667 507 try {
adamc@667 508 if (xhr.status == 200)
adamc@667 509 isok = true;
adamc@667 510 } catch (e) { }
adamc@667 511
adamc@668 512 if (isok) {
adamc@669 513 var lines = xhr.responseText.split("\n");
adamc@729 514 if (lines.length < 2) {
adamc@729 515 discon();
adamc@729 516 return;
adamc@729 517 }
adamc@669 518
adamc@669 519 for (var i = 0; i+1 < lines.length; i += 2) {
adamc@670 520 var chn = lines[i];
adamc@670 521 var msg = lines[i+1];
adamc@670 522
adamc@670 523 if (chn < 0)
adamc@670 524 whine("Out-of-bounds channel in message from remote server");
adamc@670 525
adamc@670 526 var ch;
adamc@670 527
adamc@670 528 if (chn >= channels.length || channels[chn] == null) {
adamc@670 529 ch = newChannel();
adamc@670 530 channels[chn] = ch;
adamc@670 531 } else
adamc@670 532 ch = channels[chn];
adamc@670 533
adamc@670 534 var listener = dequeue(ch.listeners);
adamc@670 535 if (listener == null) {
adamc@670 536 enqueue(ch.msgs, msg);
adamc@670 537 } else {
adamc@728 538 try {
adamc@728 539 listener(msg);
adamc@728 540 } catch (v) {
adamc@728 541 doExn(v);
adamc@728 542 }
adamc@670 543 }
adamc@669 544 }
adamc@669 545
adamc@673 546 connect();
adamc@668 547 }
adamc@667 548 else {
adamc@729 549 try {
adamc@736 550 servErr("Error querying remote server for messages: " + xhr.status);
adamc@736 551 } catch (e) { servErr("Error querying remote server for messages"); }
adamc@667 552 }
adamc@667 553 }
adamc@667 554 };
adamc@667 555
adamc@673 556 onTimeout = function() {
adamc@673 557 xhr.abort();
adamc@673 558 connect();
adamc@673 559 };
adamc@673 560
adamc@673 561 connect();
adamc@667 562 }
adamc@670 563
adamc@670 564 function rv(chn, parse, k) {
adamc@682 565 if (chn == null)
adamc@682 566 return;
adamc@682 567
adamc@670 568 if (chn < 0)
adamc@670 569 whine("Out-of-bounds channel receive");
adamc@670 570
adamc@670 571 var ch;
adamc@670 572
adamc@670 573 if (chn >= channels.length || channels[chn] == null) {
adamc@670 574 ch = newChannel();
adamc@670 575 channels[chn] = ch;
adamc@670 576 } else
adamc@670 577 ch = channels[chn];
adamc@670 578
adamc@670 579 var msg = dequeue(ch.msgs);
adamc@670 580 if (msg == null) {
adamc@670 581 enqueue(ch.listeners, function(msg) { k(parse(msg))(null); });
adamc@670 582 } else {
adamc@728 583 try {
adamc@728 584 k(parse(msg))(null);
adamc@728 585 } catch (v) {
adamc@728 586 doExn(v);
adamc@728 587 }
adamc@670 588 }
adamc@670 589 }
adamc@693 590
adamc@693 591
adamc@693 592 // App-specific code
adamc@693 593