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annotate lib/js/urweb.js @ 1039:8932f855fa85

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grid0 working in IE
author Adam Chlipala <adamc@hcoop.net>
date Sun, 22 Nov 2009 15:30:15 -0500
parents dcc6093e9575
children ca5136105c45
rev   line source
adamc@1036 1 // Detect browser quirks that we should be aware of.
adamc@1036 2
adamc@1036 3 function needsDynPrefix() {
adamc@1036 4 var span = document.createElement("span");
adamc@1036 5 span.innerHTML = "<script>alert('test');</script>";
adamc@1036 6 var scripts = span.getElementsByTagName("script");
adamc@1036 7 return scripts.length == 0;
adamc@1036 8 }
adamc@1036 9
adamc@1036 10 var dynPrefix = needsDynPrefix() ? "<span style=\"display:none\">A</span>" : "";
adamc@1036 11
adamc@970 12 // Function versions of operators
adamc@970 13
adamc@970 14 function not(x) { return !x; }
adamc@970 15 function neg(x) { return -x; }
adamc@970 16
adamc@970 17 function eq(x, y) { return x == y; }
adamc@970 18 function plus(x, y) { return x + y; }
adamc@970 19 function minus(x, y) { return x - y; }
adamc@970 20 function times(x, y) { return x * y; }
adamc@970 21 function div(x, y) { return x / y; }
adamc@970 22 function mod(x, y) { return x % y; }
adamc@970 23 function lt(x, y) { return x < y; }
adamc@970 24 function le(x, y) { return x <= y; }
adamc@970 25
adamc@692 26 // Lists
adamc@692 27
adamc@580 28 function cons(v, ls) {
adamc@690 29 return { next : ls, data : v };
adamc@690 30 }
adamc@969 31 function rev(ls) {
adamc@969 32 var acc = null;
adamc@969 33 for (; ls; ls = ls.next)
adamc@969 34 acc = cons(ls.data, acc);
adamc@969 35 return acc;
adamc@969 36 }
adamc@690 37 function concat(ls1, ls2) {
adamc@969 38 var acc = ls2;
adamc@969 39 ls1 = rev(ls1);
adamc@969 40 for (; ls1; ls1 = ls1.next)
adamc@969 41 acc = cons(ls1.data, acc);
adamc@969 42 return acc;
adamc@690 43 }
adamc@690 44 function member(x, ls) {
adamc@690 45 for (; ls; ls = ls.next)
adamc@690 46 if (ls.data == x)
adamc@690 47 return true;
adamc@690 48 return false;
adamc@690 49 }
adamc@690 50 function remove(x, ls) {
adamc@969 51 var acc = null;
adamc@969 52
adamc@969 53 for (; ls; ls = ls.next)
adamc@969 54 if (ls.data == x)
adamc@969 55 return concat(acc, ls.next);
adamc@969 56 else
adamc@969 57 acc = cons(ls.data, acc);
adamc@969 58
adamc@969 59 return ls;
adamc@690 60 }
adamc@690 61 function union(ls1, ls2) {
adamc@969 62 var acc = ls2;
adamc@969 63
adamc@969 64 for (; ls1; ls1 = ls1.next)
adamc@969 65 if (!member(ls1.data, ls2))
adamc@969 66 acc = cons(ls1.data, acc);
adamc@969 67
adamc@969 68 return acc;
adamc@580 69 }
adamc@703 70 function length(ls) {
adamc@969 71 var acc = 0;
adamc@969 72
adamc@969 73 for (; ls; ls = ls.next)
adamc@969 74 ++acc;
adamc@969 75
adamc@969 76 return acc;
adamc@703 77 }
adamc@670 78
adamc@690 79
adamc@729 80 // Error handling
adamc@729 81
adamc@729 82 function whine(msg) {
adamc@729 83 alert(msg);
adamc@729 84 throw msg;
adamc@729 85 }
adamc@729 86
adamc@810 87 function pf(loc) {
adamc@835 88 throw ("Pattern match failure (" + loc + ")");
adamc@729 89 }
adamc@729 90
adamc@798 91 function runHandlers(kind, ls, arg) {
adamc@798 92 if (ls == null)
adamc@798 93 alert(kind + ": " + arg);
adamc@729 94 for (; ls; ls = ls.next)
adamc@729 95 try {
adamc@976 96 exec({c:"a", f:{c:"a", f:ls.data, x:{c:"c", v:arg}}, x:{c:"c", v:null}});
adamc@729 97 } catch (v) { }
adamc@729 98 }
adamc@729 99
adamc@729 100 var errorHandlers = null;
adamc@729 101
adamc@729 102 function onError(f) {
adamc@729 103 errorHandlers = cons(f, errorHandlers);
adamc@729 104 }
adamc@729 105
adamc@729 106 function er(s) {
adamc@798 107 runHandlers("Error", errorHandlers, s);
adamc@729 108 throw {uw_error: s};
adamc@729 109 }
adamc@729 110
adamc@729 111 var failHandlers = null;
adamc@729 112
adamc@729 113 function onFail(f) {
adamc@729 114 failHandlers = cons(f, failHandlers);
adamc@729 115 }
adamc@729 116
adamc@729 117 function doExn(v) {
adamc@729 118 if (v == null || v.uw_error == null) {
adamc@1039 119 var s = (v == null ? "null" : v.message ? v.message : v.toString());
adamc@969 120 if (v != null && v.fileName && v.lineNumber)
adamc@969 121 s += " (" + v.fileName + ":" + v.lineNumber + ")";
adamc@798 122 runHandlers("Fail", failHandlers, s);
adamc@729 123 }
adamc@729 124 }
adamc@729 125
adamc@729 126 var disconnectHandlers = null;
adamc@729 127
adamc@976 128 function flift(f) {
adamc@977 129 return {env:cons(f,null), body:{c:"v", n:1}};
adamc@976 130 }
adamc@976 131
adamc@729 132 function onDisconnect(f) {
adamc@976 133 disconnectHandlers = cons(flift(f), disconnectHandlers);
adamc@729 134 }
adamc@729 135
adamc@729 136 function discon() {
adamc@798 137 runHandlers("Disconnect", disconnectHandlers, null);
adamc@729 138 }
adamc@729 139
adamc@729 140 var connectHandlers = null;
adamc@729 141
adamc@729 142 function onConnectFail(f) {
adamc@976 143 connectHandlers = cons(flift(f), connectHandlers);
adamc@729 144 }
adamc@729 145
adamc@729 146 function conn() {
adamc@798 147 runHandlers("Connect", connectHandlers, null);
adamc@729 148 }
adamc@729 149
adamc@729 150 var serverHandlers = null;
adamc@729 151
adamc@729 152 function onServerError(f) {
adamc@729 153 serverHandlers = cons(f, serverHandlers);
adamc@729 154 }
adamc@729 155
adamc@729 156 function servErr(s) {
adamc@824 157 window.setTimeout(function () { runHandlers("Server", serverHandlers, s); }, 0);
adamc@729 158 }
adamc@729 159
adamc@729 160
adamc@692 161 // Embedding closures in XML strings
adamc@692 162
adamc@693 163 function cs(f) {
adamc@693 164 return {closure: f};
adamc@693 165 }
adamc@693 166
adamc@693 167 function isWeird(v) {
adamc@693 168 return v.closure != null || v.cat1 != null;
adamc@693 169 }
adamc@693 170
adamc@692 171 function cat(s1, s2) {
adamc@693 172 if (isWeird(s1) || isWeird(s2))
adamc@693 173 return {cat1: s1, cat2: s2};
adamc@693 174 else
adamc@692 175 return s1 + s2;
adamc@692 176 }
adamc@692 177
adamc@692 178 var closures = [];
adamc@703 179 var freeClosures = null;
adamc@692 180
adamc@692 181 function newClosure(f) {
adamc@703 182 var n;
adamc@703 183 if (freeClosures == null) {
adamc@703 184 n = closures.length;
adamc@703 185 } else {
adamc@703 186 n = freeClosures.data;
adamc@703 187 freeClosures = freeClosures.next;
adamc@703 188 }
adamc@692 189 closures[n] = f;
adamc@692 190 return n;
adamc@692 191 }
adamc@692 192
adamc@703 193 function freeClosure(n) {
adamc@703 194 closures[n] = null;
adamc@703 195 freeClosures = cons(n, freeClosures);
adamc@703 196 }
adamc@703 197
adamc@692 198 function cr(n) {
adamc@975 199 return closures[n];
adamc@692 200 }
adamc@692 201
adamc@703 202 function flatten(cls, tr) {
adamc@693 203 if (tr.cat1 != null)
adamc@703 204 return flatten(cls, tr.cat1) + flatten(cls, tr.cat2);
adamc@703 205 else if (tr.closure != null) {
adamc@703 206 var cl = newClosure(tr.closure);
adamc@703 207 cls.v = cons(cl, cls.v);
adamc@703 208 return "cr(" + cl + ")";
adamc@703 209 } else
adamc@692 210 return tr;
adamc@692 211 }
adamc@692 212
adamc@728 213 function flattenLocal(s) {
adamc@728 214 var cls = {v : null};
adamc@728 215 var r = flatten(cls, s);
adamc@728 216 for (cl = cls.v; cl != null; cl = cl.next)
adamc@728 217 freeClosure(cl.data);
adamc@728 218 return r;
adamc@728 219 }
adamc@728 220
adamc@692 221
adamc@692 222
adamc@692 223 // Dynamic tree management
adamc@692 224
adamc@690 225 function populate(node) {
adamc@690 226 var s = node.signal;
adamc@690 227 var oldSources = node.sources;
adamc@729 228 try {
adamc@977 229 var sr = execF(s, null);
adamc@976 230 var newSources = sr._sources;
adamc@690 231
adamc@729 232 for (var sp = oldSources; sp; sp = sp.next)
adamc@729 233 if (!member(sp.data, newSources))
adamc@729 234 sp.data.dyns = remove(node, sp.data.dyns);
adamc@690 235
adamc@729 236 for (var sp = newSources; sp; sp = sp.next)
adamc@729 237 if (!member(sp.data, oldSources))
adamc@729 238 sp.data.dyns = cons(node, sp.data.dyns);
adamc@690 239
adamc@729 240 node.sources = newSources;
adamc@976 241 node.recreate(sr._data);
adamc@729 242 } catch (v) {
adamc@729 243 doExn(v);
adamc@729 244 }
adamc@579 245 }
adamc@574 246
adamc@580 247 function sc(v) {
adamc@690 248 return {data : v, dyns : null};
adamc@580 249 }
adamc@580 250 function sv(s, v) {
adamc@690 251 s.data = v;
adamc@967 252
adamc@690 253 for (var ls = s.dyns; ls; ls = ls.next)
adamc@690 254 if (!ls.dead)
adamc@690 255 populate(ls.data);
adamc@580 256 }
adamc@601 257 function sg(s) {
adamc@690 258 return s.data;
adamc@601 259 }
adamc@579 260
adamc@580 261 function ss(s) {
adamc@976 262 return {env:cons(s, null), body:{c:"r", l:
adamc@976 263 cons({n:"sources", v:{c:"c", v:cons(s, null)}},
adamc@976 264 cons({n:"data", v:{c:"f", f:sg, a:cons({c:"v", n:1}, null)}}, null))}};
adamc@580 265 }
adamc@580 266 function sr(v) {
adamc@976 267 return {env:null, body:{c:"c", v:{_sources : null, _data : v}}};
adamc@580 268 }
adamc@580 269 function sb(x,y) {
adamc@976 270 return {env:cons(y,cons(x,null)),
adamc@976 271 body:{c:"=",
adamc@977 272 e1:{c:"a", f:{c:"v", n:2}, x:{c:"c", v:null}},
adamc@976 273 e2:{c:"=",
adamc@976 274 e1:{c:"a",
adamc@977 275 f:{c:"a", f:{c:"v", n:2}, x:{c:".", r:{c:"v", n:0}, f:"data"}},
adamc@976 276 x:{c:"c", v:null}},
adamc@976 277 e2:{c:"r", l:cons(
adamc@976 278 {n:"sources", v:{c:"f", f:union, a:cons({c:".", r:{c:"v", n:1}, f:"sources"},
adamc@976 279 cons({c:".", r:{c:"v", n:0}, f:"sources"}, null))}},
adamc@976 280 cons({n:"data", v:{c:".", r:{c:"v", n:0}, f:"data"}}, null))}}}};
adamc@580 281 }
adamc@841 282 function scur(s) {
adamc@982 283 return execF(s, null)._data;
adamc@841 284 }
adamc@571 285
adamc@604 286 function lastParent() {
adamc@604 287 var pos = document;
adamc@604 288
adamc@600 289 while (pos.lastChild && pos.lastChild.nodeType == 1)
adamc@600 290 pos = pos.lastChild;
adamc@600 291
adamc@1039 292 pos = pos.parentNode;
adamc@1039 293
adamc@1039 294 return pos;
adamc@600 295 }
adamc@600 296
adamc@898 297 function parent() {
adamc@898 298 return thisScript ? thisScript.parentNode : lastParent();
adamc@898 299 }
adamc@898 300
adamc@604 301 function addNode(node) {
adamc@899 302 if (thisScript)
adamc@899 303 thisScript.parentNode.replaceChild(node, thisScript);
adamc@899 304 else
adamc@604 305 lastParent().appendChild(node);
adamc@603 306 }
adamc@603 307
adamc@690 308 var thisScript = null;
adamc@690 309
adamc@604 310 function runScripts(node) {
adamc@899 311 if (node.getElementsByTagName) {
adamc@899 312 var savedScript = thisScript;
adamc@603 313
adamc@899 314 var scripts = node.getElementsByTagName("script"), scriptsCopy = [];
adamc@899 315 var len = scripts.length;
adamc@899 316 for (var i = 0; i < len; ++i)
adamc@899 317 scriptsCopy[i] = scripts[i];
adamc@899 318 for (var i = 0; i < len; ++i) {
adamc@899 319 thisScript = scriptsCopy[i];
adamc@1039 320
adamc@899 321 try {
adamc@1036 322 eval(thisScript.text);
adamc@899 323 } catch (v) {
adamc@899 324 doExn(v);
adamc@899 325 }
adamc@899 326 if (thisScript.parentNode)
adamc@901 327 thisScript.parentNode.removeChild(thisScript);
adamc@729 328 }
adamc@899 329
adamc@899 330 thisScript = savedScript;
adamc@604 331 }
adamc@603 332 }
adamc@603 333
adamc@603 334
adamc@692 335 // Dynamic tree entry points
adamc@692 336
adamc@967 337 function killScript(scr) {
adamc@967 338 scr.dead = true;
adamc@967 339 for (var ls = scr.sources; ls; ls = ls.next)
adamc@967 340 ls.data.dyns = remove(scr, ls.data.dyns);
adamc@967 341 for (var ls = scr.closures; ls; ls = ls.next)
adamc@967 342 freeClosure(ls.data);
adamc@967 343 }
adamc@967 344
adamc@901 345 function dyn(pnode, s) {
adamc@901 346 var x = document.createElement("script");
adamc@690 347 x.dead = false;
adamc@690 348 x.signal = s;
adamc@690 349 x.sources = null;
adamc@703 350 x.closures = null;
adamc@899 351
adamc@902 352 var firstChild = null;
adamc@899 353
adamc@690 354 x.recreate = function(v) {
adamc@703 355 for (var ls = x.closures; ls; ls = ls.next)
adamc@703 356 freeClosure(ls.data);
adamc@692 357
adamc@902 358 var next;
adamc@902 359 for (var child = firstChild; child && child != x; child = next) {
adamc@902 360 next = child.nextSibling;
adamc@1039 361
adamc@967 362 killScript(child);
adamc@901 363 if (child.getElementsByTagName) {
adamc@901 364 var arr = child.getElementsByTagName("script");
adamc@967 365 for (var i = 0; i < arr.length; ++i)
adamc@967 366 killScript(arr[i]);
adamc@847 367 }
adamc@847 368
adamc@901 369 if (child.parentNode)
adamc@901 370 child.parentNode.removeChild(child);
adamc@899 371 }
adamc@690 372
adamc@703 373 var cls = {v : null};
adamc@1039 374 var html = flatten(cls, v);
adamc@1039 375 if (pnode != "table" && pnode != "tr")
adamc@1039 376 html = dynPrefix + html;
adamc@703 377 x.closures = cls.v;
adamc@899 378
adamc@901 379 if (pnode == "table") {
adamc@901 380 var dummy = document.createElement("body");
adamc@901 381 dummy.innerHTML = "<table>" + html + "</table>";
adamc@901 382 runScripts(dummy);
adamc@901 383 var table = x.parentNode;
adamc@901 384
adamc@946 385 if (table) {
adamc@946 386 firstChild = null;
adamc@946 387 var tbody;
adamc@1039 388
adamc@1039 389 var arr = dummy.getElementsByTagName("tbody");
adamc@1039 390
adamc@1039 391 var tbody;
adamc@1039 392 if (arr.length > 0 && arr[0].parentNode == dummy.firstChild) {
adamc@946 393 tbody = arr[0];
adamc@1039 394 var next;
adamc@1039 395 for (var node = dummy.firstChild.firstChild; node; node = next) {
adamc@1039 396 next = node.nextSibling;
adamc@1039 397
adamc@1039 398 if (node.tagName != "TBODY")
adamc@1039 399 tbody.appendChild(node);
adamc@1039 400 }
adamc@1039 401 } else
adamc@946 402 tbody = dummy.firstChild;
adamc@945 403
adamc@946 404 var next;
adamc@946 405 firstChild = document.createElement("script");
adamc@946 406 table.insertBefore(firstChild, x);
adamc@946 407 for (var node = tbody.firstChild; node; node = next) {
adamc@946 408 next = node.nextSibling;
adamc@946 409 table.insertBefore(node, x);
adamc@946 410 }
adamc@901 411 }
adamc@903 412 } else if (pnode == "tr") {
adamc@903 413 var dummy = document.createElement("body");
adamc@903 414 dummy.innerHTML = "<table><tr>" + html + "</tr></table>";
adamc@903 415 runScripts(dummy);
adamc@903 416 var table = x.parentNode;
adamc@903 417
adamc@946 418 if (table) {
adamc@946 419 var arr = dummy.getElementsByTagName("tr");
adamc@946 420 firstChild = null;
adamc@1039 421 var tr;
adamc@946 422 if (arr.length > 0 && table != null)
adamc@1039 423 tr = arr[0];
adamc@946 424 else
adamc@1039 425 tr = dummy.firstChild;
adamc@946 426
adamc@946 427 var next;
adamc@903 428 firstChild = document.createElement("script");
adamc@903 429 table.insertBefore(firstChild, x);
adamc@1039 430 for (var node = tr.firstChild; node; node = next) {
adamc@903 431 next = node.nextSibling;
adamc@903 432 table.insertBefore(node, x);
adamc@903 433 }
adamc@903 434 }
adamc@901 435 } else {
adamc@902 436 firstChild = document.createElement("span");
adamc@902 437 firstChild.innerHTML = html;
adamc@902 438 runScripts(firstChild);
adamc@900 439 if (x.parentNode)
adamc@902 440 x.parentNode.insertBefore(firstChild, x);
adamc@899 441 }
adamc@690 442 };
adamc@899 443
adamc@899 444 addNode(x);
adamc@690 445 populate(x);
adamc@571 446 }
adamc@582 447
adamc@1039 448 function input(t, s, recreate, type) {
adamc@598 449 var x = document.createElement(t);
adamc@1039 450 if (type) x.type = type;
adamc@690 451 x.dead = false;
adamc@690 452 x.signal = ss(s);
adamc@690 453 x.sources = null;
adamc@817 454 x.recreate = recreate(x);
adamc@899 455 addNode(x);
adamc@690 456 populate(x);
adamc@816 457
adamc@816 458 return x;
adamc@816 459 }
adamc@816 460
adamc@816 461 function inp(s) {
adamc@817 462 var x = input("input", s, function(x) { return function(v) { if (x.value != v) x.value = v; }; });
adamc@816 463 x.value = s.data;
adamc@816 464 x.onkeyup = function() { sv(s, x.value) };
adamc@816 465
adamc@816 466 return x;
adamc@816 467 }
adamc@816 468
adamc@816 469 function sel(s, content) {
adamc@817 470 var x = input("select", s, function(x) { return function(v) { if (x.value != v) x.value = v; }; });
adamc@816 471 x.innerHTML = content;
adamc@816 472 x.value = s.data;
adamc@835 473 if (x.value != s.data)
adamc@835 474 sv(s, x.value);
adamc@816 475 x.onchange = function() { sv(s, x.value) };
adamc@797 476
adamc@606 477 return x;
adamc@598 478 }
adamc@598 479
adamc@817 480 function chk(s) {
adamc@1039 481 var x = input("input", s, function(x) { return function(v) { if (x.checked != v) x.checked = v; }; }, "checkbox");
adamc@817 482 x.checked = s.data;
adamc@817 483 x.onchange = function() { sv(s, x.checked) };
adamc@817 484
adamc@817 485 return x;
adamc@817 486 }
adamc@817 487
adamc@800 488 function addOnChange(x, f) {
adamc@800 489 var old = x.onchange;
adamc@800 490 x.onchange = function() { old(); f (); };
adamc@800 491 }
adamc@800 492
adamc@692 493
adamc@692 494 // Basic string operations
adamc@692 495
adamc@597 496 function eh(x) {
adamc@800 497 if (x == null)
adamc@800 498 return "NULL";
adamc@800 499 else
adamc@800 500 return x.split("&").join("&amp;").split("<").join("&lt;").split(">").join("&gt;");
adamc@597 501 }
adamc@597 502
adamc@582 503 function ts(x) { return x.toString() }
adamc@586 504 function bs(b) { return (b ? "True" : "False") }
adamc@586 505
adamc@1038 506 function sub(s, i) { return s.charAt(i); }
adamc@828 507 function suf(s, i) { return s.substring(i); }
adamc@828 508 function slen(s) { return s.length; }
adamc@829 509 function sidx(s, ch) {
adamc@829 510 var r = s.indexOf(ch);
adamc@829 511 if (r == -1)
adamc@829 512 return null;
adamc@829 513 else
adamc@829 514 return r;
adamc@829 515 }
adamc@831 516 function sspn(s, chs) {
adamc@831 517 for (var i = 0; i < s.length; ++i)
adamc@1038 518 if (chs.indexOf(s.charAt(i)) != -1)
adamc@831 519 return i;
adamc@831 520
adamc@831 521 return null;
adamc@831 522 }
adamc@829 523 function schr(s, ch) {
adamc@829 524 var r = s.indexOf(ch);
adamc@829 525 if (r == -1)
adamc@829 526 return null;
adamc@829 527 else
adamc@829 528 return s.substring(r);
adamc@829 529 }
adamc@829 530 function ssub(s, start, len) {
adamc@829 531 return s.substring(start, start+len);
adamc@829 532 }
adamc@821 533
adamc@649 534 function pi(s) {
adamc@649 535 var r = parseInt(s);
adamc@649 536 if (r.toString() == s)
adamc@649 537 return r;
adamc@649 538 else
adamc@729 539 er("Can't parse int: " + s);
adamc@649 540 }
adamc@649 541
adamc@649 542 function pfl(s) {
adamc@649 543 var r = parseFloat(s);
adamc@649 544 if (r.toString() == s)
adamc@649 545 return r;
adamc@649 546 else
adamc@729 547 er("Can't parse float: " + s);
adamc@649 548 }
adamc@649 549
adamc@838 550 function pio(s) {
adamc@838 551 var r = parseInt(s);
adamc@838 552 if (r.toString() == s)
adamc@838 553 return r;
adamc@838 554 else
adamc@838 555 return null;
adamc@838 556 }
adamc@838 557
adamc@838 558 function pflo(s) {
adamc@838 559 var r = parseFloat(s);
adamc@838 560 if (r.toString() == s)
adamc@838 561 return r;
adamc@838 562 else
adamc@838 563 return null;
adamc@838 564 }
adamc@838 565
adamc@692 566 function uf(s) {
adamc@925 567 if (s.length == 0)
adamc@925 568 return "_";
adamc@1038 569 return (s.charAt(0) == '_' ? "_" : "")
adamc@925 570 + escape(s).replace(new RegExp ("/", "g"), "%2F").replace(new RegExp ("\\+", "g"), "%2B");
adamc@691 571 }
adamc@691 572
adamc@692 573 function uu(s) {
adamc@1038 574 if (s.length > 0 && s.charAt(0) == '_') {
adamc@925 575 s = s.substring(1);
adamc@1038 576 } else if (s.length >= 3 && s.charAt(0) == '%' && s.charAt(1) == '5' && (s.charAt(2) == 'f' || s.charAt(2) == 'F'))
adamc@927 577 s = s.substring(3);
adamc@905 578 return unescape(s.replace(new RegExp ("\\+", "g"), " "));
adamc@905 579 }
adamc@905 580
adamc@912 581 function ub(b) {
adamc@912 582 return b ? "1" : "0";
adamc@912 583 }
adamc@912 584
adamc@905 585 function uul(getToken, getData) {
adamc@905 586 var tok = getToken();
adamc@905 587 if (tok == "Nil") {
adamc@905 588 return null;
adamc@905 589 } else if (tok == "Cons") {
adamc@905 590 var d = getData();
adamc@905 591 var l = uul(getToken, getData);
adamc@905 592 return {_1:d, _2:l};
adamc@905 593 } else
adamc@982 594 whine("Can't unmarshal list (" + tok + ")");
adamc@692 595 }
adamc@692 596
adamc@961 597 function strcmp(str1, str2) {
adamc@961 598 return ((str1 == str2) ? 0 : ((str1 > str2) ? 1 : -1));
adamc@961 599 }
adamc@692 600
adamc@603 601
adamc@692 602 // Remote calls
adamc@609 603
adamc@703 604 var client_id = null;
adamc@668 605 var client_pass = 0;
adamc@668 606 var url_prefix = "/";
adamc@673 607 var timeout = 60;
adamc@668 608
adamc@668 609 function getXHR(uri)
adamc@609 610 {
adamc@609 611 try {
adamc@609 612 return new XMLHttpRequest();
adamc@609 613 } catch (e) {
adamc@609 614 try {
adamc@609 615 return new ActiveXObject("Msxml2.XMLHTTP");
adamc@609 616 } catch (e) {
adamc@609 617 try {
adamc@609 618 return new ActiveXObject("Microsoft.XMLHTTP");
adamc@609 619 } catch (e) {
adamc@982 620 whine("Your browser doesn't seem to support AJAX.");
adamc@609 621 }
adamc@609 622 }
adamc@609 623 }
adamc@609 624 }
adamc@609 625
adamc@736 626 var sig = null;
adamc@736 627
adamc@736 628 function requestUri(xhr, uri, needsSig) {
adamc@1037 629 xhr.open("POST", uri, true);
adamc@668 630
adamc@703 631 if (client_id != null) {
adamc@668 632 xhr.setRequestHeader("UrWeb-Client", client_id.toString());
adamc@668 633 xhr.setRequestHeader("UrWeb-Pass", client_pass.toString());
adamc@668 634 }
adamc@668 635
adamc@736 636 if (needsSig) {
adamc@736 637 if (sig == null)
adamc@736 638 whine("Missing cookie signature!");
adamc@736 639
adamc@736 640 xhr.setRequestHeader("UrWeb-Sig", sig);
adamc@736 641 }
adamc@736 642
adamc@668 643 xhr.send(null);
adamc@668 644 }
adamc@668 645
adamc@978 646 function rc(prefix, uri, parse, k, needsSig) {
adamc@978 647 uri = cat(prefix, uri);
adamc@728 648 uri = flattenLocal(uri);
adamc@609 649 var xhr = getXHR();
adamc@609 650
adamc@609 651 xhr.onreadystatechange = function() {
adamc@612 652 if (xhr.readyState == 4) {
adamc@612 653 var isok = false;
adamc@612 654
adamc@612 655 try {
adamc@612 656 if (xhr.status == 200)
adamc@612 657 isok = true;
adamc@612 658 } catch (e) { }
adamc@612 659
adamc@729 660 if (isok) {
adamc@729 661 try {
adamc@1020 662 k(parse(xhr.responseText));
adamc@729 663 } catch (v) {
adamc@729 664 doExn(v);
adamc@729 665 }
adamc@729 666 } else {
adamc@729 667 conn();
adamc@649 668 }
adamc@612 669 }
adamc@609 670 };
adamc@609 671
adamc@736 672 requestUri(xhr, uri, needsSig);
adamc@609 673 }
adamc@667 674
adamc@667 675 function path_join(s1, s2) {
adamc@1038 676 if (s1.length > 0 && s1.charAt(s1.length-1) == '/')
adamc@667 677 return s1 + s2;
adamc@667 678 else
adamc@667 679 return s1 + "/" + s2;
adamc@667 680 }
adamc@667 681
adamc@670 682 var channels = [];
adamc@670 683
adamc@670 684 function newQueue() {
adamc@670 685 return { front : null, back : null };
adamc@670 686 }
adamc@670 687 function enqueue(q, v) {
adamc@670 688 if (q.front == null) {
adamc@670 689 q.front = cons(v, null);
adamc@670 690 q.back = q.front;
adamc@670 691 } else {
adamc@670 692 var node = cons(v, null);
adamc@690 693 q.back.next = node;
adamc@670 694 q.back = node;
adamc@670 695 }
adamc@670 696 }
adamc@670 697 function dequeue(q) {
adamc@670 698 if (q.front == null)
adamc@670 699 return null;
adamc@670 700 else {
adamc@690 701 var r = q.front.data;
adamc@690 702 q.front = q.front.next;
adamc@670 703 if (q.front == null)
adamc@670 704 q.back = null;
adamc@670 705 return r;
adamc@670 706 }
adamc@670 707 }
adamc@670 708
adamc@670 709 function newChannel() {
adamc@670 710 return { msgs : newQueue(), listeners : newQueue() };
adamc@670 711 }
adamc@670 712
adamc@667 713 function listener() {
adamc@668 714 var uri = path_join(url_prefix, ".msgs");
adamc@667 715 var xhr = getXHR();
adamc@673 716 var tid, orsc, onTimeout;
adamc@673 717
adamc@673 718 var connect = function () {
adamc@673 719 xhr.onreadystatechange = orsc;
adamc@673 720 tid = window.setTimeout(onTimeout, timeout * 500);
adamc@736 721 requestUri(xhr, uri, false);
adamc@673 722 }
adamc@673 723
adamc@673 724 orsc = function() {
adamc@667 725 if (xhr.readyState == 4) {
adamc@673 726 window.clearTimeout(tid);
adamc@673 727
adamc@667 728 var isok = false;
adamc@667 729
adamc@667 730 try {
adamc@667 731 if (xhr.status == 200)
adamc@667 732 isok = true;
adamc@667 733 } catch (e) { }
adamc@667 734
adamc@668 735 if (isok) {
adamc@889 736 var text = xhr.responseText
adamc@889 737 if (text == "")
adamc@889 738 return;
adamc@889 739 var lines = text.split("\n");
adamc@889 740
adamc@729 741 if (lines.length < 2) {
adamc@729 742 discon();
adamc@729 743 return;
adamc@729 744 }
adamc@669 745
adamc@669 746 for (var i = 0; i+1 < lines.length; i += 2) {
adamc@670 747 var chn = lines[i];
adamc@670 748 var msg = lines[i+1];
adamc@670 749
adamc@670 750 if (chn < 0)
adamc@670 751 whine("Out-of-bounds channel in message from remote server");
adamc@670 752
adamc@670 753 var ch;
adamc@670 754
adamc@670 755 if (chn >= channels.length || channels[chn] == null) {
adamc@670 756 ch = newChannel();
adamc@670 757 channels[chn] = ch;
adamc@670 758 } else
adamc@670 759 ch = channels[chn];
adamc@670 760
adamc@670 761 var listener = dequeue(ch.listeners);
adamc@670 762 if (listener == null) {
adamc@670 763 enqueue(ch.msgs, msg);
adamc@670 764 } else {
adamc@728 765 try {
adamc@728 766 listener(msg);
adamc@728 767 } catch (v) {
adamc@728 768 doExn(v);
adamc@728 769 }
adamc@670 770 }
adamc@669 771 }
adamc@669 772
adamc@1038 773 xhr.abort();
adamc@1038 774
adamc@673 775 connect();
adamc@668 776 }
adamc@667 777 else {
adamc@729 778 try {
adamc@824 779 if (xhr.status != 0)
adamc@824 780 servErr("Error querying remote server for messages: " + xhr.status);
adamc@889 781 } catch (e) { }
adamc@667 782 }
adamc@667 783 }
adamc@667 784 };
adamc@667 785
adamc@673 786 onTimeout = function() {
adamc@673 787 xhr.abort();
adamc@673 788 connect();
adamc@673 789 };
adamc@673 790
adamc@673 791 connect();
adamc@667 792 }
adamc@670 793
adamc@670 794 function rv(chn, parse, k) {
adamc@682 795 if (chn == null)
adamc@682 796 return;
adamc@682 797
adamc@670 798 if (chn < 0)
adamc@670 799 whine("Out-of-bounds channel receive");
adamc@670 800
adamc@670 801 var ch;
adamc@670 802
adamc@670 803 if (chn >= channels.length || channels[chn] == null) {
adamc@670 804 ch = newChannel();
adamc@670 805 channels[chn] = ch;
adamc@670 806 } else
adamc@670 807 ch = channels[chn];
adamc@670 808
adamc@670 809 var msg = dequeue(ch.msgs);
adamc@670 810 if (msg == null) {
adamc@1021 811 enqueue(ch.listeners, function(msg) { k(parse(msg)); });
adamc@670 812 } else {
adamc@728 813 try {
adamc@1021 814 k(parse(msg));
adamc@728 815 } catch (v) {
adamc@728 816 doExn(v);
adamc@728 817 }
adamc@670 818 }
adamc@670 819 }
adamc@693 820
adamc@978 821 function sl(ms, k) {
adamc@1021 822 window.setTimeout(function() { k(null); }, ms);
adamc@1021 823 }
adamc@1021 824
adamc@1021 825 function sp(e) {
adamc@1021 826 execF(e, null);
adamc@978 827 }
adamc@978 828
adamc@693 829
adamc@895 830 // Key events
adamc@895 831
adamc@970 832 var uw_event = null;
adamc@970 833
adamc@970 834 function kc() {
adamc@970 835 return window.event ? uw_event.keyCode : uw_event.which;
adamc@970 836 }
adamc@970 837
adamc@970 838
adamc@970 839 // The Ur interpreter
adamc@970 840
adamc@970 841 var urfuncs = [];
adamc@970 842
adamc@970 843 function lookup(env, n) {
adamc@970 844 while (env != null) {
adamc@970 845 if (n == 0)
adamc@970 846 return env.data;
adamc@970 847 else {
adamc@970 848 --n;
adamc@970 849 env = env.next;
adamc@970 850 }
adamc@970 851 }
adamc@970 852
adamc@982 853 whine("Out-of-bounds Ur variable reference");
adamc@970 854 }
adamc@970 855
adamc@974 856 function execP(env, p, v) {
adamc@974 857 switch (p.c) {
adamc@974 858 case "w":
adamc@974 859 return env;
adamc@974 860 case "v":
adamc@974 861 return cons(v, env);
adamc@974 862 case "c":
adamc@974 863 if (v == p.v)
adamc@974 864 return env;
adamc@974 865 else
adamc@974 866 return false;
adamc@974 867 case "s":
adamc@974 868 if (v == null)
adamc@974 869 return false;
adamc@974 870 else
adamc@974 871 return execP(env, p.p, p.n ? v.v : v);
adamc@974 872 case "1":
adamc@974 873 if (v.n != p.n)
adamc@974 874 return false;
adamc@974 875 else
adamc@974 876 return execP(env, p.p, v.v);
adamc@974 877 case "r":
adamc@974 878 for (var fs = p.l; fs != null; fs = fs.next) {
adamc@974 879 env = execP(env, fs.data.p, v["_" + fs.data.n]);
adamc@974 880 if (env == false)
adamc@974 881 return false;
adamc@974 882 }
adamc@974 883 return env;
adamc@974 884 default:
adamc@982 885 whine("Unknown Ur pattern kind" + p.c);
adamc@974 886 }
adamc@974 887 }
adamc@974 888
adamc@970 889 function exec0(env, e) {
adamc@1020 890 return exec1(env, null, e);
adamc@1020 891 }
adamc@1020 892
adamc@1020 893 function exec1(env, stack, e) {
adamc@1020 894 var stack, usedK = false;
adamc@970 895
adamc@983 896 var saveEnv = function() {
adamc@983 897 if (stack.next != null && stack.next.data.c != "<")
adamc@983 898 stack = cons({c: "<", env: env}, stack.next);
adamc@983 899 else
adamc@983 900 stack = stack.next;
adamc@983 901 };
adamc@983 902
adamc@970 903 while (true) {
adamc@970 904 switch (e.c) {
adamc@970 905 case "c":
adamc@970 906 var v = e.v;
adamc@970 907 if (stack == null)
adamc@970 908 return v;
adamc@970 909 var fr = stack.data;
adamc@970 910
adamc@970 911 switch (fr.c) {
adamc@970 912 case "s":
adamc@970 913 e = {c: "c", v: {v: v}};
adamc@970 914 stack = stack.next;
adamc@970 915 break;
adamc@970 916 case "1":
adamc@970 917 e = {c: "c", v: {n: fr.n, v: v}};
adamc@970 918 stack = stack.next;
adamc@970 919 break;
adamc@970 920 case "f":
adamc@970 921 fr.args[fr.pos++] = v;
adamc@970 922 if (fr.a == null) {
adamc@1035 923 var res;
adamc@1020 924 stack = stack.next;
adamc@1035 925
adamc@1035 926 if (fr.f.apply)
adamc@1035 927 res = fr.f.apply(null, fr.args);
adamc@1035 928 else if (fr.args.length == 0)
adamc@1035 929 res = fr.f();
adamc@1035 930 else if (fr.args.length == 1)
adamc@1035 931 res = fr.f(fr.args[0]);
adamc@1035 932 else if (fr.args.length == 2)
adamc@1035 933 res = fr.f(fr.args[0], fr.args[1]);
adamc@1035 934 else if (fr.args.length == 3)
adamc@1035 935 res = fr.f(fr.args[0], fr.args[1], fr.args[2]);
adamc@1035 936 else if (fr.args.length == 4)
adamc@1035 937 res = fr.f(fr.args[0], fr.args[1], fr.args[2], fr.args[3]);
adamc@1035 938 else if (fr.args.length == 5)
adamc@1035 939 res = fr.f(fr.args[0], fr.args[1], fr.args[2], fr.args[3], fr.args[4]);
adamc@1035 940 else
adamc@1035 941 whine("Native function has " + fr.args.length + " args, but there is no special case for that count.");
adamc@1035 942
adamc@1035 943 e = {c: "c", v: res};
adamc@1020 944 if (usedK) return null;
adamc@970 945 } else {
adamc@970 946 e = fr.a.data;
adamc@970 947 fr.a = fr.a.next;
adamc@970 948 }
adamc@970 949 break;
adamc@970 950 case "a1":
adamc@970 951 e = fr.x;
adamc@971 952 stack = cons({c: "a2", f: v}, stack.next);
adamc@970 953 break;
adamc@970 954 case "a2":
adamc@971 955 if (fr.f == null)
adamc@982 956 whine("Ur: applying null function");
adamc@971 957 else if (fr.f.body) {
adamc@983 958 saveEnv();
adamc@971 959 env = cons(v, fr.f.env);
adamc@971 960 e = fr.f.body;
adamc@971 961 } else {
adamc@971 962 e = {c: "c", v: fr.f(v)};
adamc@971 963 stack = stack.next;
adamc@971 964 }
adamc@970 965 break;
adamc@978 966 case "<":
adamc@970 967 env = fr.env;
adamc@970 968 stack = stack.next;
adamc@970 969 break;
adamc@970 970 case "r":
adamc@970 971 fr.fs["_" + fr.n] = v;
adamc@970 972 if (fr.l == null) {
adamc@970 973 e = {c: "c", v: fr.fs};
adamc@970 974 stack = stack.next;
adamc@970 975 } else {
adamc@970 976 fr.n = fr.l.data.n;
adamc@970 977 e = fr.l.data.v;
adamc@970 978 fr.l = fr.l.next;
adamc@970 979 }
adamc@970 980 break;
adamc@970 981 case ".":
adamc@970 982 e = {c: "c", v: v["_" + fr.f]};
adamc@970 983 stack = stack.next;
adamc@970 984 break;
adamc@970 985 case ";":
adamc@970 986 e = fr.e2;
adamc@970 987 stack = stack.next;
adamc@970 988 break;
adamc@970 989 case "=":
adamc@983 990 saveEnv();
adamc@970 991 env = cons(v, env);
adamc@970 992 e = fr.e2;
adamc@970 993 break;
adamc@974 994 case "m":
adamc@974 995 var ps;
adamc@974 996 for (ps = fr.p; ps != null; ps = ps.next) {
adamc@974 997 var r = execP(env, ps.data.p, v);
adamc@974 998 if (r != false) {
adamc@983 999 saveEnv();
adamc@974 1000 env = r;
adamc@974 1001 e = ps.data.b;
adamc@974 1002 break;
adamc@974 1003 }
adamc@974 1004 }
adamc@974 1005 if (ps == null)
adamc@982 1006 whine("Match failure in Ur interpretation");
adamc@974 1007 break;
adamc@970 1008 default:
adamc@982 1009 whine("Unknown Ur continuation kind " + fr.c);
adamc@970 1010 }
adamc@970 1011
adamc@970 1012 break;
adamc@970 1013 case "v":
adamc@970 1014 e = {c: "c", v: lookup(env, e.n)};
adamc@970 1015 break;
adamc@970 1016 case "n":
adamc@971 1017 e = urfuncs[e.n];
adamc@970 1018 break;
adamc@970 1019 case "s":
adamc@970 1020 stack = cons({c: "s"}, stack);
adamc@970 1021 e = e.v;
adamc@970 1022 break;
adamc@970 1023 case "1":
adamc@970 1024 stack = cons({c: "1", n: e.n}, stack);
adamc@970 1025 e = e.v;
adamc@970 1026 break;
adamc@970 1027 case "f":
adamc@970 1028 if (e.a == null)
adamc@970 1029 e = {c: "c", v: e.f()};
adamc@970 1030 else {
adamc@970 1031 var args = [];
adamc@970 1032 stack = cons({c: "f", f: e.f, args: args, pos: 0, a: e.a.next}, stack);
adamc@982 1033 if (!e.a.data.c) alert("[2] fr.f = " + e.f + "; 0 = " + e.a.data);
adamc@970 1034 e = e.a.data;
adamc@970 1035 }
adamc@970 1036 break;
adamc@970 1037 case "l":
adamc@970 1038 e = {c: "c", v: {env: env, body: e.b}};
adamc@970 1039 break;
adamc@970 1040 case "a":
adamc@970 1041 stack = cons({c: "a1", x: e.x}, stack);
adamc@970 1042 e = e.f;
adamc@970 1043 break;
adamc@970 1044 case "r":
adamc@970 1045 if (e.l == null)
adamc@982 1046 whine("Empty Ur record in interpretation");
adamc@970 1047 var fs = {};
adamc@970 1048 stack = cons({c: "r", n: e.l.data.n, fs: fs, l: e.l.next}, stack);
adamc@973 1049 e = e.l.data.v;
adamc@970 1050 break;
adamc@970 1051 case ".":
adamc@970 1052 stack = cons({c: ".", f: e.f}, stack);
adamc@970 1053 e = e.r;
adamc@970 1054 break;
adamc@970 1055 case ";":
adamc@970 1056 stack = cons({c: ";", e2: e.e2}, stack);
adamc@970 1057 e = e.e1;
adamc@970 1058 break;
adamc@970 1059 case "=":
adamc@970 1060 stack = cons({c: "=", e2: e.e2}, stack);
adamc@970 1061 e = e.e1;
adamc@970 1062 break;
adamc@974 1063 case "m":
adamc@974 1064 stack = cons({c: "m", p: e.p}, stack);
adamc@974 1065 e = e.e;
adamc@974 1066 break;
adamc@970 1067 case "e":
adamc@975 1068 e = {c: "c", v: cs({c: "wc", env: env, body: e.e})};
adamc@975 1069 break;
adamc@975 1070 case "wc":
adamc@975 1071 env = e.env;
adamc@975 1072 e = e.body;
adamc@970 1073 break;
adamc@1020 1074 case "K":
adamc@1020 1075 { var savedStack = stack.next, savedEnv = env;
adamc@1020 1076 e = {c: "c", v: function(v) { return exec1(savedEnv, savedStack, {c: "c", v: v}); } };}
adamc@1020 1077 usedK = true;
adamc@1020 1078 break;
adamc@970 1079 default:
adamc@982 1080 whine("Unknown Ur expression kind " + e.c);
adamc@970 1081 }
adamc@970 1082 }
adamc@970 1083 }
adamc@970 1084
adamc@976 1085 function execD(e) {
adamc@976 1086 return exec0(null, e);
adamc@976 1087 }
adamc@976 1088
adamc@970 1089 function exec(e) {
adamc@970 1090 var r = exec0(null, e);
adamc@970 1091
adamc@975 1092 if (r != null && r.body != null)
adamc@970 1093 return function(v) { return exec0(cons(v, r.env), r.body); };
adamc@970 1094 else
adamc@970 1095 return r;
adamc@895 1096 }
adamc@895 1097
adamc@977 1098 function execF(f, x) {
adamc@977 1099 return exec0(cons(x, f.env), f.body);
adamc@977 1100 }
adamc@977 1101
adamc@895 1102
adamc@693 1103 // App-specific code
adamc@693 1104