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annotate lib/js/urweb.js @ 1553:4105f779de7b

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Even gentler handling of back-button returns to pages with stale message-passing credentials
author Adam Chlipala <adam@chlipala.net>
date Sun, 28 Aug 2011 19:32:20 -0400
parents c3b5cf5c2f98
children d5c961c709f9
rev   line source
adamc@1036 1 // Detect browser quirks that we should be aware of.
adamc@1036 2
adamc@1036 3 function needsDynPrefix() {
adamc@1260 4 var span = document.createElement("span");
adamc@1260 5 span.innerHTML = "<script>alert('test');</script>";
adamc@1260 6 var scripts = span.getElementsByTagName("script");
adamc@1260 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; }
adam@1360 22 function divInt(x, y) { var n = x / y; return n < 0 ? Math.ceil(n) : Math.floor(n); }
adamc@970 23 function mod(x, y) { return x % y; }
adam@1360 24 function modInt(x, y) { var n = x % y; return n < 0 ? Math.ceil(n) : Math.floor(n); }
adamc@970 25 function lt(x, y) { return x < y; }
adamc@970 26 function le(x, y) { return x <= y; }
adamc@970 27
adamc@1061 28 // Characters
adamc@1061 29
adamc@1061 30 function isLower(c) { return c >= 'a' && c <= 'z'; }
adamc@1061 31 function isUpper(c) { return c >= 'A' && c <= 'Z'; }
adamc@1061 32 function isAlpha(c) { return isLower(c) || isUpper(c); }
adamc@1061 33 function isDigit(c) { return c >= '0' && c <= '9'; }
adamc@1061 34 function isAlnum(c) { return isAlpha(c) || isDigit(c); }
adamc@1061 35 function isBlank(c) { return c == ' ' || c == '\t'; }
adamc@1061 36 function isSpace(c) { return isBlank(c) || c == '\r' || c == '\n'; }
adamc@1061 37 function isXdigit(c) { return isDigit(c) || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F'); }
adamc@1177 38 function toLower(c) { return c.toLowerCase(); }
adamc@1177 39 function toUpper(c) { return c.toUpperCase(); }
adamc@1061 40
adamc@1061 41
adamc@692 42 // Lists
adamc@692 43
adamc@580 44 function cons(v, ls) {
adamc@1260 45 return { next : ls, data : v };
adamc@690 46 }
adamc@969 47 function rev(ls) {
adamc@1260 48 var acc = null;
adamc@1260 49 for (; ls; ls = ls.next)
adamc@1260 50 acc = cons(ls.data, acc);
adamc@1260 51 return acc;
adamc@969 52 }
adamc@690 53 function concat(ls1, ls2) {
adamc@1260 54 var acc = ls2;
adamc@1260 55 ls1 = rev(ls1);
adamc@1260 56 for (; ls1; ls1 = ls1.next)
adamc@1260 57 acc = cons(ls1.data, acc);
adamc@1260 58 return acc;
adamc@690 59 }
adamc@690 60 function member(x, ls) {
adamc@1260 61 for (; ls; ls = ls.next)
adamc@1260 62 if (ls.data == x)
adamc@1260 63 return true;
adamc@1260 64 return false;
adamc@690 65 }
adamc@690 66 function remove(x, ls) {
adamc@1260 67 var acc = null;
adamc@969 68
adamc@1260 69 for (; ls; ls = ls.next)
adamc@1260 70 if (ls.data == x)
adamc@1260 71 return concat(acc, ls.next);
adamc@1260 72 else
adamc@1260 73 acc = cons(ls.data, acc);
adamc@969 74
adamc@1260 75 return ls;
adamc@690 76 }
adamc@690 77 function union(ls1, ls2) {
adamc@1260 78 var acc = ls2;
adamc@969 79
adamc@1260 80 for (; ls1; ls1 = ls1.next)
adamc@1260 81 if (!member(ls1.data, ls2))
adamc@1260 82 acc = cons(ls1.data, acc);
adamc@969 83
adamc@1260 84 return acc;
adamc@580 85 }
adamc@703 86 function length(ls) {
adamc@1260 87 var acc = 0;
adamc@969 88
adamc@1260 89 for (; ls; ls = ls.next)
adamc@1260 90 ++acc;
adamc@969 91
adamc@1260 92 return acc;
adamc@703 93 }
adamc@670 94
adamc@690 95
adam@1487 96 // Time
adam@1487 97
adam@1487 98 function showTime(tm) {
adam@1487 99 var newDate = new Date();
adam@1487 100 newDate.setTime(tm / 1000);
adam@1487 101 return newDate.toUTCString();
adam@1487 102 }
adam@1487 103
adam@1487 104 function now() {
adam@1487 105 return (new Date()).getTime() * 1000;
adam@1487 106 }
adam@1487 107
adam@1514 108 function diffInSeconds(tm1, tm2) {
adam@1514 109 return Math.round((tm2 - tm1) / 1000000);
adam@1514 110 }
adam@1514 111
adam@1514 112 function toSeconds(tm) {
adam@1514 113 return Math.round(tm / 1000000);
adam@1514 114 }
adam@1514 115
adam@1518 116 function addSeconds(tm, n) {
adam@1518 117 return tm + n * 1000000;
adam@1518 118 }
adam@1518 119
adam@1487 120
adamc@729 121 // Error handling
adamc@729 122
adamc@729 123 function whine(msg) {
adamc@1260 124 alert(msg);
adamc@1260 125 throw msg;
adamc@729 126 }
adamc@729 127
adamc@810 128 function pf(loc) {
adamc@1260 129 throw ("Pattern match failure (" + loc + ")");
adamc@729 130 }
adamc@729 131
adam@1553 132 var lameDuck = false;
adam@1553 133
adamc@798 134 function runHandlers(kind, ls, arg) {
adam@1553 135 if (!lameDuck) {
adam@1553 136 if (ls == null)
adam@1553 137 alert(kind + ": " + arg);
adam@1553 138 for (; ls; ls = ls.next)
adam@1553 139 try {
adam@1553 140 exec({c:"a", f:{c:"a", f:ls.data, x:{c:"c", v:arg}}, x:{c:"c", v:null}});
adam@1553 141 } catch (v) { }
adam@1553 142 }
adamc@729 143 }
adamc@729 144
adamc@729 145 var errorHandlers = null;
adamc@729 146
adamc@729 147 function onError(f) {
adamc@1260 148 errorHandlers = cons(f, errorHandlers);
adamc@729 149 }
adamc@729 150
adamc@729 151 function er(s) {
adamc@1260 152 runHandlers("Error", errorHandlers, s);
adamc@1260 153 throw {uw_error: s};
adamc@729 154 }
adamc@729 155
adamc@729 156 var failHandlers = null;
adamc@729 157
adamc@729 158 function onFail(f) {
adamc@1260 159 failHandlers = cons(f, failHandlers);
adamc@729 160 }
adamc@729 161
adamc@729 162 function doExn(v) {
adamc@1260 163 if (v == null || v.uw_error == null) {
adamc@1260 164 var s = (v == null ? "null" : v.message ? v.message : v.toString());
adamc@1260 165 if (v != null && v.fileName && v.lineNumber)
adamc@1260 166 s += " (" + v.fileName + ":" + v.lineNumber + ")";
adamc@1260 167 runHandlers("Fail", failHandlers, s);
adamc@1260 168 }
adamc@729 169 }
adamc@729 170
adamc@729 171 var disconnectHandlers = null;
adamc@729 172
adamc@976 173 function flift(f) {
kkallio@1484 174 return {c: "c", v:{env:cons(f,null), body:{c:"v", n:1}}};
adamc@976 175 }
adamc@976 176
adamc@729 177 function onDisconnect(f) {
adamc@1260 178 disconnectHandlers = cons(flift(f), disconnectHandlers);
adamc@729 179 }
adamc@729 180
adamc@729 181 function discon() {
adamc@1260 182 runHandlers("Disconnect", disconnectHandlers, null);
adamc@729 183 }
adamc@729 184
adamc@729 185 var connectHandlers = null;
adamc@729 186
adamc@729 187 function onConnectFail(f) {
adamc@1260 188 connectHandlers = cons(flift(f), connectHandlers);
adamc@729 189 }
adamc@729 190
adamc@729 191 function conn() {
adamc@1260 192 runHandlers("Connect", connectHandlers, null);
adamc@729 193 }
adamc@729 194
adamc@729 195 var serverHandlers = null;
adamc@729 196
adamc@729 197 function onServerError(f) {
adamc@1260 198 serverHandlers = cons(f, serverHandlers);
adamc@729 199 }
adamc@729 200
adamc@729 201 function servErr(s) {
adamc@1260 202 window.setTimeout(function () { runHandlers("Server", serverHandlers, s); }, 0);
adamc@729 203 }
adamc@729 204
adamc@729 205
adamc@692 206 // Embedding closures in XML strings
adamc@692 207
adamc@693 208 function cs(f) {
adamc@1260 209 return {closure: f};
adamc@693 210 }
adamc@693 211
adamc@693 212 function isWeird(v) {
adamc@1260 213 return v.closure != null || v.cat1 != null;
adamc@693 214 }
adamc@693 215
adamc@692 216 function cat(s1, s2) {
adamc@1260 217 if (isWeird(s1) || isWeird(s2))
adamc@1260 218 return {cat1: s1, cat2: s2};
adamc@1260 219 else
adamc@1260 220 return s1 + s2;
adamc@692 221 }
adamc@692 222
adamc@692 223 var closures = [];
adamc@703 224 var freeClosures = null;
adamc@692 225
adamc@692 226 function newClosure(f) {
adamc@1260 227 var n;
adamc@1260 228 if (freeClosures == null) {
adamc@1260 229 n = closures.length;
adamc@1260 230 } else {
adamc@1260 231 n = freeClosures.data;
adamc@1260 232 freeClosures = freeClosures.next;
adamc@1260 233 }
adamc@1260 234 closures[n] = f;
adamc@1260 235 return n;
adamc@692 236 }
adamc@692 237
adamc@703 238 function freeClosure(n) {
adamc@1260 239 closures[n] = null;
adamc@1260 240 freeClosures = cons(n, freeClosures);
adamc@703 241 }
adamc@703 242
adamc@692 243 function cr(n) {
adamc@1260 244 return closures[n];
adamc@692 245 }
adamc@692 246
adamc@703 247 function flatten(cls, tr) {
adamc@1260 248 if (tr.cat1 != null)
adamc@1260 249 return flatten(cls, tr.cat1) + flatten(cls, tr.cat2);
adamc@1260 250 else if (tr.closure != null) {
adamc@1260 251 var cl = newClosure(tr.closure);
adamc@1260 252 cls.v = cons(cl, cls.v);
adamc@1260 253 return "cr(" + cl + ")";
adamc@1260 254 } else
adamc@1260 255 return tr;
adamc@692 256 }
adamc@692 257
adamc@728 258 function flattenLocal(s) {
adamc@1260 259 var cls = {v : null};
adamc@1260 260 var r = flatten(cls, s);
adamc@1260 261 for (cl = cls.v; cl != null; cl = cl.next)
adamc@1260 262 freeClosure(cl.data);
adamc@1260 263 return r;
adamc@728 264 }
adamc@728 265
adamc@692 266
adamc@692 267
adamc@692 268 // Dynamic tree management
adamc@692 269
adamc@690 270 function populate(node) {
adamc@1260 271 var s = node.signal;
adamc@1260 272 var oldSources = node.sources;
adamc@1260 273 try {
adamc@1260 274 var sr = execF(s, null);
adamc@1260 275 var newSources = sr._sources;
adamc@690 276
adamc@1260 277 for (var sp = oldSources; sp; sp = sp.next)
adamc@1260 278 if (!member(sp.data, newSources))
adamc@1260 279 sp.data.dyns = remove(node, sp.data.dyns);
adamc@690 280
adamc@1260 281 for (var sp = newSources; sp; sp = sp.next)
adamc@1260 282 if (!member(sp.data, oldSources))
adamc@1260 283 sp.data.dyns = cons(node, sp.data.dyns);
adamc@690 284
adamc@1260 285 node.sources = newSources;
adamc@1260 286 node.recreate(sr._data);
adamc@1260 287 } catch (v) {
adamc@1260 288 doExn(v);
adamc@1260 289 }
adamc@579 290 }
adamc@574 291
adamc@580 292 function sc(v) {
adamc@1260 293 return {data : v, dyns : null};
adamc@580 294 }
adamc@580 295 function sv(s, v) {
adam@1491 296 if (s.data != v) {
adam@1491 297 s.data = v;
adamc@967 298
adam@1491 299 for (var ls = s.dyns; ls; ls = ls.next)
adam@1491 300 if (!ls.dead)
adam@1491 301 populate(ls.data);
adam@1491 302 }
adamc@580 303 }
adamc@601 304 function sg(s) {
adamc@1260 305 return s.data;
adamc@601 306 }
adamc@579 307
adamc@580 308 function ss(s) {
adamc@1260 309 return {env:cons(s, null), body:{c:"r", l:
adamc@1260 310 cons({n:"sources", v:{c:"c", v:cons(s, null)}},
adamc@1260 311 cons({n:"data", v:{c:"f", f:sg, a:cons({c:"v", n:1}, null)}}, null))}};
adamc@580 312 }
adamc@580 313 function sr(v) {
adamc@1260 314 return {env:null, body:{c:"c", v:{_sources : null, _data : v}}};
adamc@580 315 }
adamc@580 316 function sb(x,y) {
adamc@1260 317 return {env:cons(y,cons(x,null)),
adamc@1260 318 body:{c:"=",
adamc@1260 319 e1:{c:"a", f:{c:"v", n:2}, x:{c:"c", v:null}},
adamc@1260 320 e2:{c:"=",
adamc@1260 321 e1:{c:"a",
adamc@1260 322 f:{c:"a", f:{c:"v", n:2}, x:{c:".", r:{c:"v", n:0}, f:"data"}},
adamc@1260 323 x:{c:"c", v:null}},
adamc@1260 324 e2:{c:"r", l:cons(
adamc@1260 325 {n:"sources", v:{c:"f", f:union, a:cons({c:".", r:{c:"v", n:1}, f:"sources"},
adamc@1260 326 cons({c:".", r:{c:"v", n:0}, f:"sources"}, null))}},
adamc@1260 327 cons({n:"data", v:{c:".", r:{c:"v", n:0}, f:"data"}}, null))}}}};
adamc@580 328 }
adamc@841 329 function scur(s) {
adamc@1260 330 return execF(s, null)._data;
adamc@841 331 }
adamc@571 332
adamc@604 333 function lastParent() {
adamc@1260 334 var pos = document.body;
adamc@604 335
adamc@1260 336 while (pos.lastChild && pos.lastChild.nodeType == 1)
adamc@1260 337 pos = pos.lastChild;
adamc@600 338
adamc@1260 339 pos = pos.parentNode;
adamc@1039 340
adamc@1260 341 return pos;
adamc@600 342 }
adamc@600 343
adamc@898 344 function parent() {
adamc@1260 345 return thisScript ? thisScript.parentNode : lastParent();
adamc@898 346 }
adamc@898 347
adamc@604 348 function addNode(node) {
adamc@1260 349 if (thisScript)
adamc@1260 350 thisScript.parentNode.replaceChild(node, thisScript);
adamc@1260 351 else
adamc@1260 352 lastParent().appendChild(node);
adamc@603 353 }
adamc@603 354
adamc@690 355 var thisScript = null;
adamc@690 356
adamc@604 357 function runScripts(node) {
adamc@1260 358 if (node.getElementsByTagName) {
adamc@1260 359 var savedScript = thisScript;
adamc@603 360
adamc@1260 361 var scripts = node.getElementsByTagName("script"), scriptsCopy = [];
adamc@1260 362 var len = scripts.length;
adamc@1260 363 for (var i = 0; i < len; ++i)
adamc@1260 364 scriptsCopy[i] = scripts[i];
adamc@1260 365 for (var i = 0; i < len; ++i) {
adamc@1260 366 thisScript = scriptsCopy[i];
adamc@1039 367
adamc@1260 368 try {
adamc@1260 369 eval(thisScript.text);
adamc@1260 370 } catch (v) {
adamc@1260 371 doExn(v);
adamc@1260 372 }
adamc@1260 373 if (thisScript.parentNode)
adamc@1260 374 thisScript.parentNode.removeChild(thisScript);
adamc@1260 375 }
adamc@1260 376
adamc@1260 377 thisScript = savedScript;
adamc@729 378 }
adamc@603 379 }
adamc@603 380
adamc@603 381
adamc@692 382 // Dynamic tree entry points
adamc@692 383
adamc@967 384 function killScript(scr) {
adamc@1260 385 scr.dead = true;
adamc@1260 386 for (var ls = scr.sources; ls; ls = ls.next)
adamc@1260 387 ls.data.dyns = remove(scr, ls.data.dyns);
adamc@1260 388 for (var ls = scr.closures; ls; ls = ls.next)
adamc@1260 389 freeClosure(ls.data);
adamc@967 390 }
adamc@967 391
adam@1538 392 // Sometimes we wind up with tables that contain <script>s outside the single <tbody>.
adam@1538 393 // To avoid dealing with that case, we normalize by moving <script>s into <tbody>.
adam@1538 394 function normalizeTable(table) {
adam@1538 395 var orig = table;
adam@1538 396
adam@1538 397 var script, next;
adam@1538 398
adam@1538 399 while (table.tagName != "TABLE")
adam@1538 400 table = table.parentNode;
adam@1538 401
adam@1538 402 for (var tbody = table.firstChild; tbody; tbody = tbody.nextSibling) {
adam@1538 403 if (tbody.tagName == "TBODY") {
adam@1538 404 for (script = table.firstChild; script && script != tbody; script = next) {
adam@1538 405 next = script.nextSibling;
adam@1538 406
adam@1538 407 tbody.insertBefore(script, tbody.firstChild);
adam@1538 408 }
adam@1538 409
adam@1538 410 return;
adam@1538 411 }
adam@1538 412 }
adam@1538 413
adam@1538 414 var tbody = document.createElement("tbody");
adam@1538 415 for (script = table.firstChild; script; script = next) {
adam@1538 416 next = script.nextSibling;
adam@1538 417
adam@1538 418 tbody.insertBefore(script, tbody.firstChild);
adam@1538 419 }
adam@1538 420 table.appendChild(tbody);
adam@1538 421 }
adam@1538 422
adamc@901 423 function dyn(pnode, s) {
adamc@1260 424 var x = document.createElement("script");
adamc@1260 425 x.dead = false;
adamc@1260 426 x.signal = s;
adamc@1260 427 x.sources = null;
adamc@1260 428 x.closures = null;
adamc@899 429
adamc@1260 430 var firstChild = null;
adamc@899 431
adamc@1260 432 x.recreate = function(v) {
adamc@1260 433 for (var ls = x.closures; ls; ls = ls.next)
adamc@1260 434 freeClosure(ls.data);
adamc@945 435
adamc@946 436 var next;
adamc@1260 437 for (var child = firstChild; child && child != x; child = next) {
adamc@1260 438 next = child.nextSibling;
adamc@1260 439
adamc@1260 440 killScript(child);
adamc@1260 441 if (child.getElementsByTagName) {
adamc@1260 442 var arr = child.getElementsByTagName("script");
adamc@1260 443 for (var i = 0; i < arr.length; ++i)
adamc@1260 444 killScript(arr[i]);
adamc@1260 445 }
adamc@1260 446
adamc@1260 447 if (child.parentNode)
adamc@1260 448 child.parentNode.removeChild(child);
adamc@946 449 }
adamc@903 450
adamc@1260 451 var cls = {v : null};
adamc@1260 452 var html = flatten(cls, v);
adamc@1260 453 if (pnode != "table" && pnode != "tr")
adamc@1260 454 html = dynPrefix + html;
adamc@1260 455 x.closures = cls.v;
adamc@946 456
adamc@1260 457 if (pnode == "table") {
adam@1538 458 normalizeTable(x.parentNode);
adam@1538 459
adamc@1260 460 var dummy = document.createElement("body");
adamc@1260 461 dummy.innerHTML = "<table>" + html + "</table>";
adamc@1260 462 runScripts(dummy);
adamc@1260 463 var table = x.parentNode;
adamc@1260 464
adamc@1260 465 if (table) {
adamc@1260 466 firstChild = null;
adamc@1260 467 var tbody;
adamc@1260 468
adamc@1260 469 var arr = dummy.getElementsByTagName("tbody");
adamc@1260 470
adamc@1260 471 var tbody;
adamc@1260 472 if (arr.length > 0 && arr[0].parentNode == dummy.firstChild) {
adamc@1260 473 tbody = arr[0];
adamc@1260 474 var next;
adamc@1260 475 for (var node = dummy.firstChild.firstChild; node; node = next) {
adamc@1260 476 next = node.nextSibling;
adamc@1260 477
adamc@1260 478 if (node.tagName != "TBODY")
adamc@1260 479 tbody.appendChild(node);
adamc@1260 480 }
adamc@1260 481 } else
adamc@1260 482 tbody = dummy.firstChild;
adamc@1260 483
adamc@1260 484 var next;
adamc@1260 485 firstChild = document.createElement("script");
adamc@1260 486 table.insertBefore(firstChild, x);
adamc@1260 487 for (var node = tbody.firstChild; node; node = next) {
adamc@1260 488 next = node.nextSibling;
adamc@1260 489 table.insertBefore(node, x);
adamc@1260 490 }
adamc@1260 491 }
adamc@1260 492 } else if (pnode == "tr") {
adamc@1260 493 var dummy = document.createElement("body");
adamc@1260 494 dummy.innerHTML = "<table><tr>" + html + "</tr></table>";
adamc@1260 495 runScripts(dummy);
adamc@1260 496 var table = x.parentNode;
adamc@1260 497
adamc@1260 498 if (table) {
adamc@1260 499 var arr = dummy.getElementsByTagName("tr");
adamc@1260 500 firstChild = null;
adamc@1260 501 var tr;
adamc@1260 502 if (arr.length > 0 && table != null)
adamc@1260 503 tr = arr[0];
adamc@1260 504 else
adamc@1260 505 tr = dummy.firstChild;
adamc@1260 506
adamc@1260 507 var next;
adamc@1260 508 firstChild = document.createElement("script");
adamc@1260 509 table.insertBefore(firstChild, x);
adamc@1260 510 for (var node = tr.firstChild; node; node = next) {
adamc@1260 511 next = node.nextSibling;
adamc@1260 512 table.insertBefore(node, x);
adamc@1260 513 }
adamc@1260 514 }
adamc@1260 515 } else {
adamc@1260 516 firstChild = document.createElement("span");
adamc@1260 517 firstChild.innerHTML = html;
adamc@1260 518 runScripts(firstChild);
adamc@1260 519 if (x.parentNode)
adamc@1260 520 x.parentNode.insertBefore(firstChild, x);
adamc@903 521 }
adamc@1260 522 };
adamc@899 523
adamc@1260 524 addNode(x);
adamc@1260 525 populate(x);
adamc@571 526 }
adamc@582 527
adam@1463 528 function input(x, s, recreate, type, name) {
adam@1463 529 if (name) x.name = name;
adamc@1260 530 if (type) x.type = type;
adamc@1260 531 x.dead = false;
adamc@1260 532 x.signal = ss(s);
adamc@1260 533 x.sources = null;
adamc@1260 534 x.recreate = recreate(x);
adamc@1260 535 addNode(x);
adamc@1260 536 populate(x);
adamc@816 537
adamc@1260 538 return x;
adamc@816 539 }
adamc@816 540
adam@1463 541 function inp(s, name) {
adamc@1260 542 var x = input(document.createElement("input"), s,
adam@1463 543 function(x) { return function(v) { if (x.value != v) x.value = v; }; }, null, name);
adamc@1260 544 x.value = s.data;
adam@1491 545 x.onkeyup = x.oninput = x.onchange = x.onpropertychange = function() { sv(s, x.value) };
adamc@816 546
adamc@1260 547 return x;
adamc@816 548 }
adamc@816 549
adam@1479 550 function selectValue(x) {
adam@1479 551 if (x.options.length == 0)
adam@1479 552 return "";
adam@1479 553 else
adam@1479 554 return x.options[x.selectedIndex].value;
adam@1479 555 }
adam@1479 556
adam@1479 557 function setSelectValue(x, v) {
adam@1479 558 for (var i = 0; i < x.options.length; ++i) {
adam@1479 559 if(x.options[i].value == v) {
adam@1479 560 x.selectedIndex = i;
adam@1479 561 return;
adam@1479 562 }
adam@1479 563 }
adam@1479 564 }
adam@1479 565
adamc@816 566 function sel(s, content) {
adamc@1260 567 var dummy = document.createElement("span");
adamc@1260 568 dummy.innerHTML = "<select>" + content + "</select>";
adam@1479 569 var x = input(dummy.firstChild, s, function(x) { return function(v) { if (selectValue(x) != v) setSelectValue(x, v); }; });
adam@1479 570
adam@1479 571 for (var i = 0; i < x.options.length; ++i) {
adam@1479 572 if (x.options[i].value == "")
adam@1479 573 x.options[i].value = x.options[i].text;
adam@1479 574 else
adam@1479 575 x.options[i].value = x.options[i].value.substring(1);
adam@1479 576 }
adam@1479 577
adam@1479 578 setSelectValue(x, s.data);
adam@1479 579 if (selectValue(x) != s.data)
adam@1479 580 sv(s, selectValue(x));
adam@1479 581 x.onchange = function() { sv(s, selectValue(x)) };
adamc@797 582
adamc@1260 583 return x;
adamc@598 584 }
adamc@598 585
adamc@817 586 function chk(s) {
adamc@1260 587 var x = input(document.createElement("input"), s,
adamc@1260 588 function(x) { return function(v) { if (x.checked != v) x.checked = v; }; }, "checkbox");
adamc@1260 589 x.defaultChecked = x.checked = s.data;
adamc@1260 590 x.onclick = function() { sv(s, x.checked) };
adamc@817 591
adamc@1260 592 return x;
adamc@817 593 }
adamc@817 594
adamc@1099 595 function tbx(s) {
adamc@1260 596 var x = input(document.createElement("textarea"), s,
adamc@1260 597 function(x) { return function(v) { if (x.innerHTML != v) x.innerHTML = v; }; });
adamc@1260 598 x.innerHTML = s.data;
adam@1491 599 x.onkeyup = x.oninput = x.onchange = x.onpropertychange = function() { sv(s, x.value) };
adamc@1099 600
adamc@1260 601 return x;
adamc@1099 602 }
adamc@1099 603
adamc@800 604 function addOnChange(x, f) {
adamc@1260 605 var old = x.onchange;
adam@1290 606 if (old == null)
adam@1290 607 x.onchange = f;
adam@1290 608 else
adam@1290 609 x.onchange = function() { old(); f(); };
adam@1290 610 }
adam@1290 611
adam@1290 612 function addOnKeyUp(x, f) {
adam@1290 613 var old = x.onkeyup;
adam@1290 614 if (old == null)
adam@1290 615 x.onkeyup = f;
adam@1290 616 else
adam@1290 617 x.onkeyup = function(x) { old(x); f(x); };
adamc@800 618 }
adamc@800 619
adamc@692 620
adamc@692 621 // Basic string operations
adamc@692 622
adamc@597 623 function eh(x) {
adamc@1260 624 if (x == null)
adamc@1260 625 return "NULL";
adamc@1260 626 else
adamc@1260 627 return x.split("&").join("&amp;").split("<").join("&lt;").split(">").join("&gt;");
adamc@597 628 }
adamc@597 629
adamc@582 630 function ts(x) { return x.toString() }
adamc@586 631 function bs(b) { return (b ? "True" : "False") }
adamc@586 632
adamc@1057 633 function id(x) { return x; }
adamc@1038 634 function sub(s, i) { return s.charAt(i); }
adamc@828 635 function suf(s, i) { return s.substring(i); }
adamc@828 636 function slen(s) { return s.length; }
adamc@829 637 function sidx(s, ch) {
adamc@1260 638 var r = s.indexOf(ch);
adamc@1260 639 if (r == -1)
adamc@1260 640 return null;
adamc@1260 641 else
adamc@1260 642 return r;
adamc@829 643 }
adamc@831 644 function sspn(s, chs) {
adamc@1260 645 for (var i = 0; i < s.length; ++i)
adamc@1260 646 if (chs.indexOf(s.charAt(i)) != -1)
adamc@1260 647 return i;
adamc@831 648
adamc@1260 649 return null;
adamc@831 650 }
adamc@829 651 function schr(s, ch) {
adamc@1260 652 var r = s.indexOf(ch);
adamc@1260 653 if (r == -1)
adamc@1260 654 return null;
adamc@1260 655 else
adamc@1260 656 return s.substring(r);
adamc@829 657 }
adamc@829 658 function ssub(s, start, len) {
adamc@1260 659 return s.substring(start, start+len);
adamc@829 660 }
adamc@821 661
adamc@649 662 function pi(s) {
adamc@1260 663 var r = parseInt(s);
adamc@1260 664 if (r.toString() == s)
adamc@1260 665 return r;
adamc@1260 666 else
adamc@1260 667 er("Can't parse int: " + s);
adamc@649 668 }
adamc@649 669
adamc@649 670 function pfl(s) {
adamc@1260 671 var r = parseFloat(s);
adamc@1260 672 if (r.toString() == s)
adamc@1260 673 return r;
adamc@1260 674 else
adamc@1260 675 er("Can't parse float: " + s);
adamc@649 676 }
adamc@649 677
adamc@838 678 function pio(s) {
adamc@1260 679 var r = parseInt(s);
adamc@1260 680 if (r.toString() == s)
adamc@1260 681 return r;
adamc@1260 682 else
adamc@1260 683 return null;
adamc@838 684 }
adamc@838 685
adamc@838 686 function pflo(s) {
adamc@1260 687 var r = parseFloat(s);
adamc@1260 688 if (r.toString() == s)
adamc@1260 689 return r;
adamc@1260 690 else
adamc@1260 691 return null;
adamc@838 692 }
adamc@838 693
adamc@692 694 function uf(s) {
adamc@1260 695 if (s.length == 0)
adamc@1260 696 return "_";
adamc@1260 697 s = s.replace(new RegExp ("\\.", "g"), ".2E");
adamc@1260 698 return (s.charAt(0) == '_' ? "_" : "") + encodeURIComponent(s).replace(new RegExp ("%", "g"), ".");
adamc@691 699 }
adamc@691 700
adamc@692 701 function uu(s) {
adamc@1260 702 if (s.length > 0 && s.charAt(0) == '_') {
adamc@1260 703 s = s.substring(1);
adamc@1260 704 } else if (s.length >= 3 && (s.charAt(0) == '%' || s.charAt(0) == '.')
adamc@1260 705 && s.charAt(1) == '5' && (s.charAt(2) == 'f' || s.charAt(2) == 'F'))
adamc@1260 706 s = s.substring(3);
adamc@1260 707 s = s.replace(new RegExp ("\\+", "g"), " ");
adamc@1260 708 s = s.replace(new RegExp ("\\.", "g"), "%");
adamc@1260 709 return decodeURIComponent(s);
adamc@905 710 }
adamc@905 711
adamc@1108 712 function atr(s) {
adamc@1260 713 return s.replace(new RegExp ("\"", "g"), "&quot;").replace(new RegExp ("&", "g"), "&amp;")
adamc@1260 714 }
adamc@1108 715
adamc@912 716 function ub(b) {
adamc@1260 717 return b ? "1" : "0";
adamc@912 718 }
adamc@912 719
adamc@905 720 function uul(getToken, getData) {
adamc@1260 721 var tok = getToken();
adamc@1260 722 if (tok == "Nil") {
adamc@1260 723 return null;
adamc@1260 724 } else if (tok == "Cons") {
adamc@1260 725 var d = getData();
adamc@1260 726 var l = uul(getToken, getData);
adamc@1260 727 return {_1:d, _2:l};
adamc@1260 728 } else
adamc@1260 729 whine("Can't unmarshal list (" + tok + ")");
adamc@692 730 }
adamc@692 731
adamc@961 732 function strcmp(str1, str2) {
adamc@1260 733 return ((str1 == str2) ? 0 : ((str1 > str2) ? 1 : -1));
adamc@961 734 }
adamc@692 735
adamc@603 736
adamc@692 737 // Remote calls
adamc@609 738
adamc@703 739 var client_id = null;
adamc@668 740 var client_pass = 0;
adamc@668 741 var url_prefix = "/";
adamc@673 742 var timeout = 60;
adam@1552 743 var isPost = false;
adamc@668 744
adamc@668 745 function getXHR(uri)
adamc@609 746 {
adamc@609 747 try {
adamc@1260 748 return new XMLHttpRequest();
adamc@609 749 } catch (e) {
adamc@1260 750 try {
adamc@1260 751 return new ActiveXObject("Msxml2.XMLHTTP");
adamc@1260 752 } catch (e) {
adamc@1260 753 try {
adamc@1260 754 return new ActiveXObject("Microsoft.XMLHTTP");
adamc@1260 755 } catch (e) {
adamc@1260 756 whine("Your browser doesn't seem to support AJAX.");
adamc@1260 757 }
adamc@1260 758 }
adamc@609 759 }
adamc@609 760 }
adamc@609 761
adamc@736 762 var sig = null;
adamc@736 763
adamc@1042 764 var unloading = false, inFlight = null;
adamc@1042 765
adamc@1042 766 function unload() {
adamc@1260 767 unloading = true;
adamc@1042 768
adamc@1260 769 for (; inFlight; inFlight = inFlight.next) {
adamc@1260 770 inFlight.data.abort();
adamc@1260 771 }
adamc@1042 772 }
adamc@1042 773
adamc@736 774 function requestUri(xhr, uri, needsSig) {
adamc@1260 775 if (unloading)
adamc@1260 776 return;
adamc@1042 777
adamc@1260 778 xhr.open("POST", uri, true);
adamc@1260 779 xhr.setRequestHeader("Content-type", "text/plain");
adam@1549 780 try {
adam@1549 781 xhr.setRequestHeader("Content-length", "0");
adam@1549 782 xhr.setRequestHeader("Connection", "close");
adam@1549 783 } catch (e) { }
adamc@668 784
adamc@1260 785 if (client_id != null) {
adamc@1260 786 xhr.setRequestHeader("UrWeb-Client", client_id.toString());
adamc@1260 787 xhr.setRequestHeader("UrWeb-Pass", client_pass.toString());
adamc@1260 788 }
adamc@668 789
adamc@1260 790 if (needsSig) {
adamc@1260 791 if (sig == null)
adamc@1260 792 whine("Missing cookie signature!");
adamc@736 793
adamc@1260 794 xhr.setRequestHeader("UrWeb-Sig", sig);
adamc@1260 795 }
adamc@736 796
adamc@1260 797 inFlight = cons(xhr, inFlight);
adamc@1260 798 xhr.send(null);
adamc@668 799 }
adamc@668 800
adamc@1042 801 function xhrFinished(xhr) {
adamc@1260 802 xhr.abort();
adamc@1260 803 inFlight = remove(xhr, inFlight);
adamc@1042 804 }
adamc@1042 805
adamc@1111 806 function unurlify(parse, s) {
adamc@1260 807 return parse(s);
adamc@1111 808 }
adamc@1111 809
adam@1385 810 function redirect(s) {
adam@1385 811 window.location = s;
adam@1385 812 }
adam@1385 813
adamc@978 814 function rc(prefix, uri, parse, k, needsSig) {
adamc@1260 815 uri = cat(prefix, uri);
adamc@1260 816 uri = flattenLocal(uri);
adamc@1260 817 var xhr = getXHR();
adamc@609 818
adamc@1260 819 xhr.onreadystatechange = function() {
adamc@1260 820 if (xhr.readyState == 4) {
adamc@1260 821 var isok = false;
adamc@612 822
adamc@1260 823 try {
adamc@1260 824 if (xhr.status == 200)
adamc@1260 825 isok = true;
adamc@1260 826 } catch (e) { }
adamc@612 827
adamc@1260 828 if (isok) {
adam@1446 829 var lines = xhr.responseText.split("\n");
adam@1446 830 if (lines.length != 2)
adam@1446 831 whine("Bad RPC response lines");
adam@1446 832
adam@1446 833 eval(lines[0]);
adam@1446 834
adamc@1260 835 try {
adam@1446 836 k(parse(lines[1]));
adamc@1260 837 } catch (v) {
adamc@1260 838 doExn(v);
adamc@1260 839 }
adamc@1260 840 } else {
adamc@1260 841 conn();
adamc@1260 842 }
adamc@1260 843
adamc@1260 844 xhrFinished(xhr);
adamc@729 845 }
adamc@1260 846 };
adamc@1042 847
adamc@1260 848 requestUri(xhr, uri, needsSig);
adamc@609 849 }
adamc@667 850
adamc@667 851 function path_join(s1, s2) {
adamc@1260 852 if (s1.length > 0 && s1.charAt(s1.length-1) == '/')
adamc@1260 853 return s1 + s2;
adamc@1260 854 else
adamc@1260 855 return s1 + "/" + s2;
adamc@667 856 }
adamc@667 857
adamc@670 858 var channels = [];
adamc@670 859
adamc@670 860 function newQueue() {
adamc@1260 861 return { front : null, back : null };
adamc@670 862 }
adamc@670 863 function enqueue(q, v) {
adamc@1260 864 if (q.front == null) {
adamc@1260 865 q.front = cons(v, null);
adamc@1260 866 q.back = q.front;
adamc@1260 867 } else {
adamc@1260 868 var node = cons(v, null);
adamc@1260 869 q.back.next = node;
adamc@1260 870 q.back = node;
adamc@1260 871 }
adamc@670 872 }
adamc@670 873 function dequeue(q) {
adamc@670 874 if (q.front == null)
adamc@1260 875 return null;
adamc@1260 876 else {
adamc@1260 877 var r = q.front.data;
adamc@1260 878 q.front = q.front.next;
adamc@1260 879 if (q.front == null)
adamc@1260 880 q.back = null;
adamc@1260 881 return r;
adamc@1260 882 }
adamc@670 883 }
adamc@670 884
adamc@670 885 function newChannel() {
adamc@1260 886 return { msgs : newQueue(), listeners : newQueue() };
adamc@670 887 }
adamc@670 888
adamc@667 889 function listener() {
adamc@1260 890 var uri = path_join(url_prefix, ".msgs");
adamc@1260 891 var xhr = getXHR();
adamc@1260 892 var tid, orsc, onTimeout;
adamc@673 893
adamc@1260 894 var connect = function () {
adamc@1260 895 xhr.onreadystatechange = orsc;
adamc@1260 896 tid = window.setTimeout(onTimeout, timeout * 500);
adamc@1260 897 requestUri(xhr, uri, false);
adamc@1260 898 }
adamc@673 899
adamc@1260 900 orsc = function() {
adamc@1260 901 if (xhr.readyState == 4) {
adamc@1260 902 window.clearTimeout(tid);
adamc@673 903
adamc@1260 904 var isok = false;
adamc@667 905
adamc@1260 906 try {
adamc@1260 907 if (xhr.status == 200)
adamc@1260 908 isok = true;
adamc@1260 909 } catch (e) { }
adamc@667 910
adamc@1260 911 if (isok) {
adam@1447 912 var text = xhr.responseText;
adamc@1260 913 if (text == "")
adamc@1260 914 return;
adamc@1260 915 var lines = text.split("\n");
adamc@889 916
adam@1552 917 if (lines.length == 1 && lines[0] == "R") {
adam@1553 918 lameDuck = true;
adam@1553 919
adam@1552 920 if (isPost)
adam@1552 921 history.back();
adam@1552 922 else
adam@1552 923 location.reload();
adam@1552 924
adam@1552 925 return;
adam@1552 926 }
adam@1552 927
adamc@1260 928 if (lines.length < 2) {
adamc@1260 929 discon();
adamc@1260 930 return;
adamc@1260 931 }
adamc@1260 932
adam@1447 933 var messageReader = function(i) {
adam@1447 934 if (i+1 >= lines.length) {
adam@1447 935 xhrFinished(xhr);
adam@1447 936 connect();
adam@1447 937 }
adam@1447 938 else {
adam@1447 939 var chn = lines[i];
adam@1447 940 var msg = lines[i+1];
adamc@1260 941
adam@1447 942 if (chn == "E") {
adam@1447 943 eval(msg);
adam@1447 944 window.setTimeout(function() { messageReader(i+2); }, 0);
adam@1447 945 } else {
adam@1447 946 if (chn < 0)
adam@1447 947 whine("Out-of-bounds channel in message from remote server");
adamc@1260 948
adam@1447 949 var ch;
adamc@1260 950
adam@1447 951 if (chn >= channels.length || channels[chn] == null) {
adam@1447 952 ch = newChannel();
adam@1447 953 channels[chn] = ch;
adam@1447 954 } else
adam@1447 955 ch = channels[chn];
adamc@1260 956
adam@1447 957 var listener = dequeue(ch.listeners);
adam@1447 958 if (listener == null) {
adam@1447 959 enqueue(ch.msgs, msg);
adam@1447 960 } else {
adam@1447 961 try {
adam@1447 962 listener(msg);
adam@1447 963 } catch (v) {
adam@1447 964 doExn(v);
adam@1447 965 }
adam@1447 966 }
adam@1447 967
adam@1447 968 messageReader(i+2);
adamc@1260 969 }
adamc@1260 970 }
adamc@1260 971 }
adamc@1260 972
adam@1447 973 messageReader(0);
adamc@1260 974 }
adamc@1260 975 else {
adamc@1260 976 try {
adamc@1260 977 if (xhr.status != 0)
adamc@1260 978 servErr("Error querying remote server for messages: " + xhr.status);
adamc@1260 979 } catch (e) { }
adamc@1260 980 }
adamc@729 981 }
adamc@1260 982 };
adamc@669 983
adamc@1260 984 onTimeout = function() {
adamc@1260 985 xhrFinished(xhr);
adamc@1260 986 connect();
adamc@1260 987 };
adamc@670 988
adamc@673 989 connect();
adamc@667 990 }
adamc@670 991
adamc@670 992 function rv(chn, parse, k) {
adamc@1260 993 if (chn == null)
adamc@1260 994 return;
adamc@682 995
adamc@1260 996 if (chn < 0)
adamc@1260 997 whine("Out-of-bounds channel receive");
adamc@670 998
adamc@1260 999 var ch;
adamc@670 1000
adamc@1260 1001 if (chn >= channels.length || channels[chn] == null) {
adamc@1260 1002 ch = newChannel();
adamc@1260 1003 channels[chn] = ch;
adamc@1260 1004 } else
adamc@1260 1005 ch = channels[chn];
adamc@670 1006
adamc@1260 1007 var msg = dequeue(ch.msgs);
adamc@1260 1008 if (msg == null) {
adamc@1260 1009 enqueue(ch.listeners, function(msg) { k(parse(msg)); });
adamc@1260 1010 } else {
adamc@1260 1011 try {
adamc@1260 1012 k(parse(msg));
adamc@1260 1013 } catch (v) {
adamc@1260 1014 doExn(v);
adamc@1260 1015 }
adamc@728 1016 }
adamc@670 1017 }
adamc@693 1018
adamc@978 1019 function sl(ms, k) {
adamc@1260 1020 window.setTimeout(function() { k(null); }, ms);
adamc@1021 1021 }
adamc@1021 1022
adamc@1021 1023 function sp(e) {
adamc@1260 1024 execF(e, null);
adamc@978 1025 }
adamc@978 1026
adamc@693 1027
adamc@895 1028 // Key events
adamc@895 1029
adamc@970 1030 var uw_event = null;
adamc@970 1031
adamc@970 1032 function kc() {
adam@1290 1033 return window.event ? event.keyCode : (uw_event ? uw_event.keyCode : 0);
adamc@970 1034 }
adamc@970 1035
adamc@970 1036
adamc@970 1037 // The Ur interpreter
adamc@970 1038
adamc@970 1039 var urfuncs = [];
adamc@970 1040
adamc@970 1041 function lookup(env, n) {
adamc@1260 1042 while (env != null) {
adamc@1260 1043 if (n == 0)
adamc@1260 1044 return env.data;
adamc@1260 1045 else {
adamc@1260 1046 --n;
adamc@1260 1047 env = env.next;
adamc@1260 1048 }
adamc@970 1049 }
adamc@970 1050
adamc@1260 1051 whine("Out-of-bounds Ur variable reference");
adamc@970 1052 }
adamc@970 1053
adamc@974 1054 function execP(env, p, v) {
adamc@1260 1055 switch (p.c) {
adamc@1260 1056 case "w":
adamc@1260 1057 return env;
adamc@1260 1058 case "v":
adamc@1260 1059 return cons(v, env);
adamc@1260 1060 case "c":
adamc@1260 1061 if (v == p.v)
adamc@1260 1062 return env;
adamc@1260 1063 else
adamc@1260 1064 return false;
adamc@1260 1065 case "s":
adamc@1260 1066 if (v == null)
adamc@1260 1067 return false;
adamc@1260 1068 else
adamc@1260 1069 return execP(env, p.p, p.n ? v.v : v);
adamc@1260 1070 case "1":
adamc@1260 1071 if (v.n != p.n)
adamc@1260 1072 return false;
adamc@1260 1073 else
adamc@1260 1074 return execP(env, p.p, v.v);
adamc@1260 1075 case "r":
adamc@1260 1076 for (var fs = p.l; fs != null; fs = fs.next) {
adamc@1260 1077 env = execP(env, fs.data.p, v["_" + fs.data.n]);
adamc@1260 1078 if (env == false)
adamc@1260 1079 return false;
adamc@1260 1080 }
adamc@1260 1081 return env;
adamc@1260 1082 default:
adamc@1260 1083 whine("Unknown Ur pattern kind" + p.c);
adamc@974 1084 }
adamc@974 1085 }
adamc@974 1086
adamc@970 1087 function exec0(env, e) {
adamc@1260 1088 return exec1(env, null, e);
adamc@1020 1089 }
adamc@1020 1090
adamc@1020 1091 function exec1(env, stack, e) {
adamc@1260 1092 var stack, usedK = false;
adamc@970 1093
adamc@1260 1094 var saveEnv = function() {
adamc@1260 1095 if (stack.next != null && stack.next.data.c != "<")
adamc@1260 1096 stack = cons({c: "<", env: env}, stack.next);
adamc@1260 1097 else
adamc@1260 1098 stack = stack.next;
adamc@1260 1099 };
adamc@983 1100
adamc@1260 1101 while (true) {
adamc@1260 1102 switch (e.c) {
adamc@1260 1103 case "c":
adamc@1260 1104 var v = e.v;
adamc@1260 1105 if (stack == null)
adamc@1260 1106 return v;
adamc@1260 1107 var fr = stack.data;
adamc@970 1108
adamc@1260 1109 switch (fr.c) {
adamc@1260 1110 case "s":
adamc@1260 1111 e = {c: "c", v: {v: v}};
adamc@1260 1112 stack = stack.next;
adamc@1260 1113 break;
adamc@1260 1114 case "1":
adamc@1260 1115 e = {c: "c", v: {n: fr.n, v: v}};
adamc@1260 1116 stack = stack.next;
adamc@1260 1117 break;
adamc@1260 1118 case "f":
adamc@1260 1119 fr.args[fr.pos++] = v;
adamc@1260 1120 if (fr.a == null) {
adamc@1260 1121 var res;
adamc@1260 1122 stack = stack.next;
adamc@1035 1123
adamc@1260 1124 if (fr.f.apply)
adamc@1260 1125 res = fr.f.apply(null, fr.args);
adamc@1260 1126 else if (fr.args.length == 0)
adamc@1260 1127 res = fr.f();
adamc@1260 1128 else if (fr.args.length == 1)
adamc@1260 1129 res = fr.f(fr.args[0]);
adamc@1260 1130 else if (fr.args.length == 2)
adamc@1260 1131 res = fr.f(fr.args[0], fr.args[1]);
adamc@1260 1132 else if (fr.args.length == 3)
adamc@1260 1133 res = fr.f(fr.args[0], fr.args[1], fr.args[2]);
adamc@1260 1134 else if (fr.args.length == 4)
adamc@1260 1135 res = fr.f(fr.args[0], fr.args[1], fr.args[2], fr.args[3]);
adamc@1260 1136 else if (fr.args.length == 5)
adamc@1260 1137 res = fr.f(fr.args[0], fr.args[1], fr.args[2], fr.args[3], fr.args[4]);
adamc@1260 1138 else
adamc@1260 1139 whine("Native function has " + fr.args.length + " args, but there is no special case for that count.");
adamc@1035 1140
adamc@1260 1141 e = {c: "c", v: res};
adamc@1260 1142 if (usedK) return null;
adamc@1260 1143 } else {
adamc@1260 1144 e = fr.a.data;
adamc@1260 1145 fr.a = fr.a.next;
adamc@1260 1146 }
adamc@1260 1147 break;
adamc@1260 1148 case "a1":
adamc@1260 1149 e = fr.x;
adamc@1260 1150 stack = cons({c: "a2", f: v}, stack.next);
adamc@1260 1151 break;
adamc@1260 1152 case "a2":
adamc@1260 1153 if (fr.f == null)
adamc@1260 1154 whine("Ur: applying null function");
adamc@1260 1155 else if (fr.f.body) {
adamc@1260 1156 saveEnv();
adamc@1260 1157 env = cons(v, fr.f.env);
adamc@1260 1158 e = fr.f.body;
adamc@1260 1159 } else {
adamc@1260 1160 e = {c: "c", v: fr.f(v)};
adamc@1260 1161 stack = stack.next;
adamc@1260 1162 }
adamc@1260 1163 break;
adamc@1260 1164 case "<":
adamc@1260 1165 env = fr.env;
adamc@1260 1166 stack = stack.next;
adamc@1260 1167 break;
adamc@1260 1168 case "r":
adamc@1260 1169 fr.fs["_" + fr.n] = v;
adamc@1260 1170 if (fr.l == null) {
adamc@1260 1171 e = {c: "c", v: fr.fs};
adamc@1260 1172 stack = stack.next;
adamc@1260 1173 } else {
adamc@1260 1174 fr.n = fr.l.data.n;
adamc@1260 1175 e = fr.l.data.v;
adamc@1260 1176 fr.l = fr.l.next;
adamc@1260 1177 }
adamc@1260 1178 break;
adamc@1260 1179 case ".":
adamc@1260 1180 e = {c: "c", v: v["_" + fr.f]};
adamc@1260 1181 stack = stack.next;
adamc@1260 1182 break;
adamc@1260 1183 case ";":
adamc@1260 1184 e = fr.e2;
adamc@1260 1185 stack = stack.next;
adamc@1260 1186 break;
adamc@1260 1187 case "=":
adamc@1260 1188 saveEnv();
adamc@1260 1189 env = cons(v, env);
adamc@1260 1190 e = fr.e2;
adamc@1260 1191 break;
adamc@1260 1192 case "m":
adamc@1260 1193 var ps;
adamc@1260 1194 for (ps = fr.p; ps != null; ps = ps.next) {
adamc@1260 1195 var r = execP(env, ps.data.p, v);
adamc@1260 1196 if (r != false) {
adamc@1260 1197 saveEnv();
adamc@1260 1198 env = r;
adamc@1260 1199 e = ps.data.b;
adamc@1260 1200 break;
adamc@1260 1201 }
adamc@1260 1202 }
adamc@1260 1203 if (ps == null)
adamc@1260 1204 whine("Match failure in Ur interpretation");
adamc@1260 1205 break;
adamc@1260 1206 default:
adamc@1260 1207 whine("Unknown Ur continuation kind " + fr.c);
adamc@1260 1208 }
adamc@1260 1209
adamc@1260 1210 break;
adamc@1260 1211 case "v":
adamc@1260 1212 e = {c: "c", v: lookup(env, e.n)};
adamc@1260 1213 break;
adamc@1260 1214 case "n":
adamc@1260 1215 var idx = e.n;
adamc@1260 1216 e = urfuncs[idx];
adamc@1260 1217 if (e.c == "t")
adamc@1262 1218 e = urfuncs[idx] = eval("(" + e.f + ")");
adamc@1260 1219 break;
adamc@1260 1220 case "s":
adamc@1260 1221 stack = cons({c: "s"}, stack);
adamc@1260 1222 e = e.v;
adamc@1260 1223 break;
adamc@1260 1224 case "1":
adamc@1260 1225 stack = cons({c: "1", n: e.n}, stack);
adamc@1260 1226 e = e.v;
adamc@1260 1227 break;
adamc@1260 1228 case "f":
adamc@1260 1229 if (e.a == null)
adamc@1260 1230 e = {c: "c", v: (eval(e.f))()};
adamc@1260 1231 else {
adamc@1260 1232 var args = [];
adamc@1260 1233 stack = cons({c: "f", f: eval(e.f), args: args, pos: 0, a: e.a.next}, stack);
adamc@1260 1234 if (!e.a.data.c) alert("[2] fr.f = " + e.f + "; 0 = " + e.a.data);
adamc@1260 1235 e = e.a.data;
adamc@1260 1236 }
adamc@1260 1237 break;
adamc@1260 1238 case "l":
adamc@1260 1239 e = {c: "c", v: {env: env, body: e.b}};
adamc@1260 1240 break;
adamc@1260 1241 case "a":
adamc@1260 1242 stack = cons({c: "a1", x: e.x}, stack);
adamc@1260 1243 e = e.f;
adamc@1260 1244 break;
adamc@1260 1245 case "r":
adamc@1260 1246 if (e.l == null)
adamc@1260 1247 whine("Empty Ur record in interpretation");
adamc@1260 1248 var fs = {};
adamc@1260 1249 stack = cons({c: "r", n: e.l.data.n, fs: fs, l: e.l.next}, stack);
adamc@1260 1250 e = e.l.data.v;
adamc@1260 1251 break;
adamc@1260 1252 case ".":
adamc@1260 1253 stack = cons({c: ".", f: e.f}, stack);
adamc@1260 1254 e = e.r;
adamc@1260 1255 break;
adamc@1260 1256 case ";":
adamc@1260 1257 stack = cons({c: ";", e2: e.e2}, stack);
adamc@1260 1258 e = e.e1;
adamc@1260 1259 break;
adamc@1260 1260 case "=":
adamc@1260 1261 stack = cons({c: "=", e2: e.e2}, stack);
adamc@1260 1262 e = e.e1;
adamc@1260 1263 break;
adamc@1260 1264 case "m":
adamc@1260 1265 stack = cons({c: "m", p: e.p}, stack);
adamc@1260 1266 e = e.e;
adamc@1260 1267 break;
adamc@1260 1268 case "e":
adamc@1260 1269 e = {c: "c", v: cs({c: "wc", env: env, body: e.e})};
adamc@1260 1270 break;
adamc@1260 1271 case "wc":
adamc@1260 1272 env = e.env;
adamc@1260 1273 e = e.body;
adamc@1260 1274 break;
adamc@1260 1275 case "K":
adamc@1260 1276 { var savedStack = stack.next, savedEnv = env;
adamc@1260 1277 e = {c: "c", v: function(v) { return exec1(savedEnv, savedStack, {c: "c", v: v}); } };}
adamc@1260 1278 usedK = true;
adamc@1260 1279 break;
adamc@1260 1280 default:
adamc@1260 1281 whine("Unknown Ur expression kind " + e.c);
adamc@970 1282 }
adamc@970 1283 }
adamc@970 1284 }
adamc@970 1285
adamc@976 1286 function execD(e) {
adamc@1260 1287 return exec0(null, e);
adamc@976 1288 }
adamc@976 1289
adamc@970 1290 function exec(e) {
adamc@1260 1291 var r = exec0(null, e);
adamc@970 1292
adamc@1260 1293 if (r != null && r.body != null)
adamc@1260 1294 return function(v) { return exec0(cons(v, r.env), r.body); };
adamc@1260 1295 else
adamc@1260 1296 return r;
adamc@895 1297 }
adamc@895 1298
adamc@977 1299 function execF(f, x) {
adamc@1260 1300 return exec0(cons(x, f.env), f.body);
adamc@977 1301 }
adamc@977 1302
adamc@895 1303
adam@1290 1304 // Wrappers
adam@1290 1305
adam@1290 1306 function confrm(s) {
adam@1290 1307 return confirm(s) ? true : false;
adam@1290 1308 }
adam@1290 1309
adam@1290 1310
adamc@1323 1311 // URL blessing
adamc@1323 1312
adamc@1323 1313 var urlRules = null;
adamc@1323 1314
adamc@1323 1315 function checkUrl(s) {
adamc@1323 1316 for (var r = urlRules; r; r = r.next) {
adamc@1323 1317 var ru = r.data;
adamc@1323 1318 if (ru.prefix ? s.indexOf(ru.pattern) == 0 : s == ru.pattern)
adamc@1323 1319 return ru.allow ? s : null;
adamc@1323 1320 }
adamc@1323 1321
adamc@1323 1322 return null;
adamc@1323 1323 }
adamc@1323 1324
adamc@1323 1325 function bless(s) {
adamc@1323 1326 u = checkUrl(s);
adamc@1323 1327 if (u == null)
adamc@1323 1328 er("Disallowed URL: " + s);
adamc@1323 1329 return u;
adamc@1323 1330 }
adamc@1323 1331
adamc@693 1332 // App-specific code
adamc@693 1333