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annotate lib/js/urweb.js @ 1514:3c0803c1acd7

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Backpedal on tutorial-motivated urweb-mode changes; add Basis.diffInSeconds and Basis.toSeconds
author Adam Chlipala <adam@chlipala.net>
date Fri, 22 Jul 2011 15:39:38 -0400
parents b2ca3e1e5b40
children 883347f5c3c2
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@1487 116
adamc@729 117 // Error handling
adamc@729 118
adamc@729 119 function whine(msg) {
adamc@1260 120 alert(msg);
adamc@1260 121 throw msg;
adamc@729 122 }
adamc@729 123
adamc@810 124 function pf(loc) {
adamc@1260 125 throw ("Pattern match failure (" + loc + ")");
adamc@729 126 }
adamc@729 127
adamc@798 128 function runHandlers(kind, ls, arg) {
adamc@1260 129 if (ls == null)
adamc@1260 130 alert(kind + ": " + arg);
adamc@1260 131 for (; ls; ls = ls.next)
adamc@1260 132 try {
adamc@1260 133 exec({c:"a", f:{c:"a", f:ls.data, x:{c:"c", v:arg}}, x:{c:"c", v:null}});
adamc@1260 134 } catch (v) { }
adamc@729 135 }
adamc@729 136
adamc@729 137 var errorHandlers = null;
adamc@729 138
adamc@729 139 function onError(f) {
adamc@1260 140 errorHandlers = cons(f, errorHandlers);
adamc@729 141 }
adamc@729 142
adamc@729 143 function er(s) {
adamc@1260 144 runHandlers("Error", errorHandlers, s);
adamc@1260 145 throw {uw_error: s};
adamc@729 146 }
adamc@729 147
adamc@729 148 var failHandlers = null;
adamc@729 149
adamc@729 150 function onFail(f) {
adamc@1260 151 failHandlers = cons(f, failHandlers);
adamc@729 152 }
adamc@729 153
adamc@729 154 function doExn(v) {
adamc@1260 155 if (v == null || v.uw_error == null) {
adamc@1260 156 var s = (v == null ? "null" : v.message ? v.message : v.toString());
adamc@1260 157 if (v != null && v.fileName && v.lineNumber)
adamc@1260 158 s += " (" + v.fileName + ":" + v.lineNumber + ")";
adamc@1260 159 runHandlers("Fail", failHandlers, s);
adamc@1260 160 }
adamc@729 161 }
adamc@729 162
adamc@729 163 var disconnectHandlers = null;
adamc@729 164
adamc@976 165 function flift(f) {
kkallio@1484 166 return {c: "c", v:{env:cons(f,null), body:{c:"v", n:1}}};
adamc@976 167 }
adamc@976 168
adamc@729 169 function onDisconnect(f) {
adamc@1260 170 disconnectHandlers = cons(flift(f), disconnectHandlers);
adamc@729 171 }
adamc@729 172
adamc@729 173 function discon() {
adamc@1260 174 runHandlers("Disconnect", disconnectHandlers, null);
adamc@729 175 }
adamc@729 176
adamc@729 177 var connectHandlers = null;
adamc@729 178
adamc@729 179 function onConnectFail(f) {
adamc@1260 180 connectHandlers = cons(flift(f), connectHandlers);
adamc@729 181 }
adamc@729 182
adamc@729 183 function conn() {
adamc@1260 184 runHandlers("Connect", connectHandlers, null);
adamc@729 185 }
adamc@729 186
adamc@729 187 var serverHandlers = null;
adamc@729 188
adamc@729 189 function onServerError(f) {
adamc@1260 190 serverHandlers = cons(f, serverHandlers);
adamc@729 191 }
adamc@729 192
adamc@729 193 function servErr(s) {
adamc@1260 194 window.setTimeout(function () { runHandlers("Server", serverHandlers, s); }, 0);
adamc@729 195 }
adamc@729 196
adamc@729 197
adamc@692 198 // Embedding closures in XML strings
adamc@692 199
adamc@693 200 function cs(f) {
adamc@1260 201 return {closure: f};
adamc@693 202 }
adamc@693 203
adamc@693 204 function isWeird(v) {
adamc@1260 205 return v.closure != null || v.cat1 != null;
adamc@693 206 }
adamc@693 207
adamc@692 208 function cat(s1, s2) {
adamc@1260 209 if (isWeird(s1) || isWeird(s2))
adamc@1260 210 return {cat1: s1, cat2: s2};
adamc@1260 211 else
adamc@1260 212 return s1 + s2;
adamc@692 213 }
adamc@692 214
adamc@692 215 var closures = [];
adamc@703 216 var freeClosures = null;
adamc@692 217
adamc@692 218 function newClosure(f) {
adamc@1260 219 var n;
adamc@1260 220 if (freeClosures == null) {
adamc@1260 221 n = closures.length;
adamc@1260 222 } else {
adamc@1260 223 n = freeClosures.data;
adamc@1260 224 freeClosures = freeClosures.next;
adamc@1260 225 }
adamc@1260 226 closures[n] = f;
adamc@1260 227 return n;
adamc@692 228 }
adamc@692 229
adamc@703 230 function freeClosure(n) {
adamc@1260 231 closures[n] = null;
adamc@1260 232 freeClosures = cons(n, freeClosures);
adamc@703 233 }
adamc@703 234
adamc@692 235 function cr(n) {
adamc@1260 236 return closures[n];
adamc@692 237 }
adamc@692 238
adamc@703 239 function flatten(cls, tr) {
adamc@1260 240 if (tr.cat1 != null)
adamc@1260 241 return flatten(cls, tr.cat1) + flatten(cls, tr.cat2);
adamc@1260 242 else if (tr.closure != null) {
adamc@1260 243 var cl = newClosure(tr.closure);
adamc@1260 244 cls.v = cons(cl, cls.v);
adamc@1260 245 return "cr(" + cl + ")";
adamc@1260 246 } else
adamc@1260 247 return tr;
adamc@692 248 }
adamc@692 249
adamc@728 250 function flattenLocal(s) {
adamc@1260 251 var cls = {v : null};
adamc@1260 252 var r = flatten(cls, s);
adamc@1260 253 for (cl = cls.v; cl != null; cl = cl.next)
adamc@1260 254 freeClosure(cl.data);
adamc@1260 255 return r;
adamc@728 256 }
adamc@728 257
adamc@692 258
adamc@692 259
adamc@692 260 // Dynamic tree management
adamc@692 261
adamc@690 262 function populate(node) {
adamc@1260 263 var s = node.signal;
adamc@1260 264 var oldSources = node.sources;
adamc@1260 265 try {
adamc@1260 266 var sr = execF(s, null);
adamc@1260 267 var newSources = sr._sources;
adamc@690 268
adamc@1260 269 for (var sp = oldSources; sp; sp = sp.next)
adamc@1260 270 if (!member(sp.data, newSources))
adamc@1260 271 sp.data.dyns = remove(node, sp.data.dyns);
adamc@690 272
adamc@1260 273 for (var sp = newSources; sp; sp = sp.next)
adamc@1260 274 if (!member(sp.data, oldSources))
adamc@1260 275 sp.data.dyns = cons(node, sp.data.dyns);
adamc@690 276
adamc@1260 277 node.sources = newSources;
adamc@1260 278 node.recreate(sr._data);
adamc@1260 279 } catch (v) {
adamc@1260 280 doExn(v);
adamc@1260 281 }
adamc@579 282 }
adamc@574 283
adamc@580 284 function sc(v) {
adamc@1260 285 return {data : v, dyns : null};
adamc@580 286 }
adamc@580 287 function sv(s, v) {
adam@1491 288 if (s.data != v) {
adam@1491 289 s.data = v;
adamc@967 290
adam@1491 291 for (var ls = s.dyns; ls; ls = ls.next)
adam@1491 292 if (!ls.dead)
adam@1491 293 populate(ls.data);
adam@1491 294 }
adamc@580 295 }
adamc@601 296 function sg(s) {
adamc@1260 297 return s.data;
adamc@601 298 }
adamc@579 299
adamc@580 300 function ss(s) {
adamc@1260 301 return {env:cons(s, null), body:{c:"r", l:
adamc@1260 302 cons({n:"sources", v:{c:"c", v:cons(s, null)}},
adamc@1260 303 cons({n:"data", v:{c:"f", f:sg, a:cons({c:"v", n:1}, null)}}, null))}};
adamc@580 304 }
adamc@580 305 function sr(v) {
adamc@1260 306 return {env:null, body:{c:"c", v:{_sources : null, _data : v}}};
adamc@580 307 }
adamc@580 308 function sb(x,y) {
adamc@1260 309 return {env:cons(y,cons(x,null)),
adamc@1260 310 body:{c:"=",
adamc@1260 311 e1:{c:"a", f:{c:"v", n:2}, x:{c:"c", v:null}},
adamc@1260 312 e2:{c:"=",
adamc@1260 313 e1:{c:"a",
adamc@1260 314 f:{c:"a", f:{c:"v", n:2}, x:{c:".", r:{c:"v", n:0}, f:"data"}},
adamc@1260 315 x:{c:"c", v:null}},
adamc@1260 316 e2:{c:"r", l:cons(
adamc@1260 317 {n:"sources", v:{c:"f", f:union, a:cons({c:".", r:{c:"v", n:1}, f:"sources"},
adamc@1260 318 cons({c:".", r:{c:"v", n:0}, f:"sources"}, null))}},
adamc@1260 319 cons({n:"data", v:{c:".", r:{c:"v", n:0}, f:"data"}}, null))}}}};
adamc@580 320 }
adamc@841 321 function scur(s) {
adamc@1260 322 return execF(s, null)._data;
adamc@841 323 }
adamc@571 324
adamc@604 325 function lastParent() {
adamc@1260 326 var pos = document.body;
adamc@604 327
adamc@1260 328 while (pos.lastChild && pos.lastChild.nodeType == 1)
adamc@1260 329 pos = pos.lastChild;
adamc@600 330
adamc@1260 331 pos = pos.parentNode;
adamc@1039 332
adamc@1260 333 return pos;
adamc@600 334 }
adamc@600 335
adamc@898 336 function parent() {
adamc@1260 337 return thisScript ? thisScript.parentNode : lastParent();
adamc@898 338 }
adamc@898 339
adamc@604 340 function addNode(node) {
adamc@1260 341 if (thisScript)
adamc@1260 342 thisScript.parentNode.replaceChild(node, thisScript);
adamc@1260 343 else
adamc@1260 344 lastParent().appendChild(node);
adamc@603 345 }
adamc@603 346
adamc@690 347 var thisScript = null;
adamc@690 348
adamc@604 349 function runScripts(node) {
adamc@1260 350 if (node.getElementsByTagName) {
adamc@1260 351 var savedScript = thisScript;
adamc@603 352
adamc@1260 353 var scripts = node.getElementsByTagName("script"), scriptsCopy = [];
adamc@1260 354 var len = scripts.length;
adamc@1260 355 for (var i = 0; i < len; ++i)
adamc@1260 356 scriptsCopy[i] = scripts[i];
adamc@1260 357 for (var i = 0; i < len; ++i) {
adamc@1260 358 thisScript = scriptsCopy[i];
adamc@1039 359
adamc@1260 360 try {
adamc@1260 361 eval(thisScript.text);
adamc@1260 362 } catch (v) {
adamc@1260 363 doExn(v);
adamc@1260 364 }
adamc@1260 365 if (thisScript.parentNode)
adamc@1260 366 thisScript.parentNode.removeChild(thisScript);
adamc@1260 367 }
adamc@1260 368
adamc@1260 369 thisScript = savedScript;
adamc@729 370 }
adamc@603 371 }
adamc@603 372
adamc@603 373
adamc@692 374 // Dynamic tree entry points
adamc@692 375
adamc@967 376 function killScript(scr) {
adamc@1260 377 scr.dead = true;
adamc@1260 378 for (var ls = scr.sources; ls; ls = ls.next)
adamc@1260 379 ls.data.dyns = remove(scr, ls.data.dyns);
adamc@1260 380 for (var ls = scr.closures; ls; ls = ls.next)
adamc@1260 381 freeClosure(ls.data);
adamc@967 382 }
adamc@967 383
adamc@901 384 function dyn(pnode, s) {
adamc@1260 385 var x = document.createElement("script");
adamc@1260 386 x.dead = false;
adamc@1260 387 x.signal = s;
adamc@1260 388 x.sources = null;
adamc@1260 389 x.closures = null;
adamc@899 390
adamc@1260 391 var firstChild = null;
adamc@899 392
adamc@1260 393 x.recreate = function(v) {
adamc@1260 394 for (var ls = x.closures; ls; ls = ls.next)
adamc@1260 395 freeClosure(ls.data);
adamc@945 396
adamc@946 397 var next;
adamc@1260 398 for (var child = firstChild; child && child != x; child = next) {
adamc@1260 399 next = child.nextSibling;
adamc@1260 400
adamc@1260 401 killScript(child);
adamc@1260 402 if (child.getElementsByTagName) {
adamc@1260 403 var arr = child.getElementsByTagName("script");
adamc@1260 404 for (var i = 0; i < arr.length; ++i)
adamc@1260 405 killScript(arr[i]);
adamc@1260 406 }
adamc@1260 407
adamc@1260 408 if (child.parentNode)
adamc@1260 409 child.parentNode.removeChild(child);
adamc@946 410 }
adamc@903 411
adamc@1260 412 var cls = {v : null};
adamc@1260 413 var html = flatten(cls, v);
adamc@1260 414 if (pnode != "table" && pnode != "tr")
adamc@1260 415 html = dynPrefix + html;
adamc@1260 416 x.closures = cls.v;
adamc@946 417
adamc@1260 418 if (pnode == "table") {
adamc@1260 419 var dummy = document.createElement("body");
adamc@1260 420 dummy.innerHTML = "<table>" + html + "</table>";
adamc@1260 421 runScripts(dummy);
adamc@1260 422 var table = x.parentNode;
adamc@1260 423
adamc@1260 424 if (table) {
adamc@1260 425 firstChild = null;
adamc@1260 426 var tbody;
adamc@1260 427
adamc@1260 428 var arr = dummy.getElementsByTagName("tbody");
adamc@1260 429
adamc@1260 430 var tbody;
adamc@1260 431 if (arr.length > 0 && arr[0].parentNode == dummy.firstChild) {
adamc@1260 432 tbody = arr[0];
adamc@1260 433 var next;
adamc@1260 434 for (var node = dummy.firstChild.firstChild; node; node = next) {
adamc@1260 435 next = node.nextSibling;
adamc@1260 436
adamc@1260 437 if (node.tagName != "TBODY")
adamc@1260 438 tbody.appendChild(node);
adamc@1260 439 }
adamc@1260 440 } else
adamc@1260 441 tbody = dummy.firstChild;
adamc@1260 442
adamc@1260 443 var next;
adamc@1260 444 firstChild = document.createElement("script");
adamc@1260 445 table.insertBefore(firstChild, x);
adamc@1260 446 for (var node = tbody.firstChild; node; node = next) {
adamc@1260 447 next = node.nextSibling;
adamc@1260 448 table.insertBefore(node, x);
adamc@1260 449 }
adamc@1260 450 }
adamc@1260 451 } else if (pnode == "tr") {
adamc@1260 452 var dummy = document.createElement("body");
adamc@1260 453 dummy.innerHTML = "<table><tr>" + html + "</tr></table>";
adamc@1260 454 runScripts(dummy);
adamc@1260 455 var table = x.parentNode;
adamc@1260 456
adamc@1260 457 if (table) {
adamc@1260 458 var arr = dummy.getElementsByTagName("tr");
adamc@1260 459 firstChild = null;
adamc@1260 460 var tr;
adamc@1260 461 if (arr.length > 0 && table != null)
adamc@1260 462 tr = arr[0];
adamc@1260 463 else
adamc@1260 464 tr = dummy.firstChild;
adamc@1260 465
adamc@1260 466 var next;
adamc@1260 467 firstChild = document.createElement("script");
adamc@1260 468 table.insertBefore(firstChild, x);
adamc@1260 469 for (var node = tr.firstChild; node; node = next) {
adamc@1260 470 next = node.nextSibling;
adamc@1260 471 table.insertBefore(node, x);
adamc@1260 472 }
adamc@1260 473 }
adamc@1260 474 } else {
adamc@1260 475 firstChild = document.createElement("span");
adamc@1260 476 firstChild.innerHTML = html;
adamc@1260 477 runScripts(firstChild);
adamc@1260 478 if (x.parentNode)
adamc@1260 479 x.parentNode.insertBefore(firstChild, x);
adamc@903 480 }
adamc@1260 481 };
adamc@899 482
adamc@1260 483 addNode(x);
adamc@1260 484 populate(x);
adamc@571 485 }
adamc@582 486
adam@1463 487 function input(x, s, recreate, type, name) {
adam@1463 488 if (name) x.name = name;
adamc@1260 489 if (type) x.type = type;
adamc@1260 490 x.dead = false;
adamc@1260 491 x.signal = ss(s);
adamc@1260 492 x.sources = null;
adamc@1260 493 x.recreate = recreate(x);
adamc@1260 494 addNode(x);
adamc@1260 495 populate(x);
adamc@816 496
adamc@1260 497 return x;
adamc@816 498 }
adamc@816 499
adam@1463 500 function inp(s, name) {
adamc@1260 501 var x = input(document.createElement("input"), s,
adam@1463 502 function(x) { return function(v) { if (x.value != v) x.value = v; }; }, null, name);
adamc@1260 503 x.value = s.data;
adam@1491 504 x.onkeyup = x.oninput = x.onchange = x.onpropertychange = function() { sv(s, x.value) };
adamc@816 505
adamc@1260 506 return x;
adamc@816 507 }
adamc@816 508
adam@1479 509 function selectValue(x) {
adam@1479 510 if (x.options.length == 0)
adam@1479 511 return "";
adam@1479 512 else
adam@1479 513 return x.options[x.selectedIndex].value;
adam@1479 514 }
adam@1479 515
adam@1479 516 function setSelectValue(x, v) {
adam@1479 517 for (var i = 0; i < x.options.length; ++i) {
adam@1479 518 if(x.options[i].value == v) {
adam@1479 519 x.selectedIndex = i;
adam@1479 520 return;
adam@1479 521 }
adam@1479 522 }
adam@1479 523 }
adam@1479 524
adamc@816 525 function sel(s, content) {
adamc@1260 526 var dummy = document.createElement("span");
adamc@1260 527 dummy.innerHTML = "<select>" + content + "</select>";
adam@1479 528 var x = input(dummy.firstChild, s, function(x) { return function(v) { if (selectValue(x) != v) setSelectValue(x, v); }; });
adam@1479 529
adam@1479 530 for (var i = 0; i < x.options.length; ++i) {
adam@1479 531 if (x.options[i].value == "")
adam@1479 532 x.options[i].value = x.options[i].text;
adam@1479 533 else
adam@1479 534 x.options[i].value = x.options[i].value.substring(1);
adam@1479 535 }
adam@1479 536
adam@1479 537 setSelectValue(x, s.data);
adam@1479 538 if (selectValue(x) != s.data)
adam@1479 539 sv(s, selectValue(x));
adam@1479 540 x.onchange = function() { sv(s, selectValue(x)) };
adamc@797 541
adamc@1260 542 return x;
adamc@598 543 }
adamc@598 544
adamc@817 545 function chk(s) {
adamc@1260 546 var x = input(document.createElement("input"), s,
adamc@1260 547 function(x) { return function(v) { if (x.checked != v) x.checked = v; }; }, "checkbox");
adamc@1260 548 x.defaultChecked = x.checked = s.data;
adamc@1260 549 x.onclick = function() { sv(s, x.checked) };
adamc@817 550
adamc@1260 551 return x;
adamc@817 552 }
adamc@817 553
adamc@1099 554 function tbx(s) {
adamc@1260 555 var x = input(document.createElement("textarea"), s,
adamc@1260 556 function(x) { return function(v) { if (x.innerHTML != v) x.innerHTML = v; }; });
adamc@1260 557 x.innerHTML = s.data;
adam@1491 558 x.onkeyup = x.oninput = x.onchange = x.onpropertychange = function() { sv(s, x.value) };
adamc@1099 559
adamc@1260 560 return x;
adamc@1099 561 }
adamc@1099 562
adamc@800 563 function addOnChange(x, f) {
adamc@1260 564 var old = x.onchange;
adam@1290 565 if (old == null)
adam@1290 566 x.onchange = f;
adam@1290 567 else
adam@1290 568 x.onchange = function() { old(); f(); };
adam@1290 569 }
adam@1290 570
adam@1290 571 function addOnKeyUp(x, f) {
adam@1290 572 var old = x.onkeyup;
adam@1290 573 if (old == null)
adam@1290 574 x.onkeyup = f;
adam@1290 575 else
adam@1290 576 x.onkeyup = function(x) { old(x); f(x); };
adamc@800 577 }
adamc@800 578
adamc@692 579
adamc@692 580 // Basic string operations
adamc@692 581
adamc@597 582 function eh(x) {
adamc@1260 583 if (x == null)
adamc@1260 584 return "NULL";
adamc@1260 585 else
adamc@1260 586 return x.split("&").join("&amp;").split("<").join("&lt;").split(">").join("&gt;");
adamc@597 587 }
adamc@597 588
adamc@582 589 function ts(x) { return x.toString() }
adamc@586 590 function bs(b) { return (b ? "True" : "False") }
adamc@586 591
adamc@1057 592 function id(x) { return x; }
adamc@1038 593 function sub(s, i) { return s.charAt(i); }
adamc@828 594 function suf(s, i) { return s.substring(i); }
adamc@828 595 function slen(s) { return s.length; }
adamc@829 596 function sidx(s, ch) {
adamc@1260 597 var r = s.indexOf(ch);
adamc@1260 598 if (r == -1)
adamc@1260 599 return null;
adamc@1260 600 else
adamc@1260 601 return r;
adamc@829 602 }
adamc@831 603 function sspn(s, chs) {
adamc@1260 604 for (var i = 0; i < s.length; ++i)
adamc@1260 605 if (chs.indexOf(s.charAt(i)) != -1)
adamc@1260 606 return i;
adamc@831 607
adamc@1260 608 return null;
adamc@831 609 }
adamc@829 610 function schr(s, ch) {
adamc@1260 611 var r = s.indexOf(ch);
adamc@1260 612 if (r == -1)
adamc@1260 613 return null;
adamc@1260 614 else
adamc@1260 615 return s.substring(r);
adamc@829 616 }
adamc@829 617 function ssub(s, start, len) {
adamc@1260 618 return s.substring(start, start+len);
adamc@829 619 }
adamc@821 620
adamc@649 621 function pi(s) {
adamc@1260 622 var r = parseInt(s);
adamc@1260 623 if (r.toString() == s)
adamc@1260 624 return r;
adamc@1260 625 else
adamc@1260 626 er("Can't parse int: " + s);
adamc@649 627 }
adamc@649 628
adamc@649 629 function pfl(s) {
adamc@1260 630 var r = parseFloat(s);
adamc@1260 631 if (r.toString() == s)
adamc@1260 632 return r;
adamc@1260 633 else
adamc@1260 634 er("Can't parse float: " + s);
adamc@649 635 }
adamc@649 636
adamc@838 637 function pio(s) {
adamc@1260 638 var r = parseInt(s);
adamc@1260 639 if (r.toString() == s)
adamc@1260 640 return r;
adamc@1260 641 else
adamc@1260 642 return null;
adamc@838 643 }
adamc@838 644
adamc@838 645 function pflo(s) {
adamc@1260 646 var r = parseFloat(s);
adamc@1260 647 if (r.toString() == s)
adamc@1260 648 return r;
adamc@1260 649 else
adamc@1260 650 return null;
adamc@838 651 }
adamc@838 652
adamc@692 653 function uf(s) {
adamc@1260 654 if (s.length == 0)
adamc@1260 655 return "_";
adamc@1260 656 s = s.replace(new RegExp ("\\.", "g"), ".2E");
adamc@1260 657 return (s.charAt(0) == '_' ? "_" : "") + encodeURIComponent(s).replace(new RegExp ("%", "g"), ".");
adamc@691 658 }
adamc@691 659
adamc@692 660 function uu(s) {
adamc@1260 661 if (s.length > 0 && s.charAt(0) == '_') {
adamc@1260 662 s = s.substring(1);
adamc@1260 663 } else if (s.length >= 3 && (s.charAt(0) == '%' || s.charAt(0) == '.')
adamc@1260 664 && s.charAt(1) == '5' && (s.charAt(2) == 'f' || s.charAt(2) == 'F'))
adamc@1260 665 s = s.substring(3);
adamc@1260 666 s = s.replace(new RegExp ("\\+", "g"), " ");
adamc@1260 667 s = s.replace(new RegExp ("\\.", "g"), "%");
adamc@1260 668 return decodeURIComponent(s);
adamc@905 669 }
adamc@905 670
adamc@1108 671 function atr(s) {
adamc@1260 672 return s.replace(new RegExp ("\"", "g"), "&quot;").replace(new RegExp ("&", "g"), "&amp;")
adamc@1260 673 }
adamc@1108 674
adamc@912 675 function ub(b) {
adamc@1260 676 return b ? "1" : "0";
adamc@912 677 }
adamc@912 678
adamc@905 679 function uul(getToken, getData) {
adamc@1260 680 var tok = getToken();
adamc@1260 681 if (tok == "Nil") {
adamc@1260 682 return null;
adamc@1260 683 } else if (tok == "Cons") {
adamc@1260 684 var d = getData();
adamc@1260 685 var l = uul(getToken, getData);
adamc@1260 686 return {_1:d, _2:l};
adamc@1260 687 } else
adamc@1260 688 whine("Can't unmarshal list (" + tok + ")");
adamc@692 689 }
adamc@692 690
adamc@961 691 function strcmp(str1, str2) {
adamc@1260 692 return ((str1 == str2) ? 0 : ((str1 > str2) ? 1 : -1));
adamc@961 693 }
adamc@692 694
adamc@603 695
adamc@692 696 // Remote calls
adamc@609 697
adamc@703 698 var client_id = null;
adamc@668 699 var client_pass = 0;
adamc@668 700 var url_prefix = "/";
adamc@673 701 var timeout = 60;
adamc@668 702
adamc@668 703 function getXHR(uri)
adamc@609 704 {
adamc@609 705 try {
adamc@1260 706 return new XMLHttpRequest();
adamc@609 707 } catch (e) {
adamc@1260 708 try {
adamc@1260 709 return new ActiveXObject("Msxml2.XMLHTTP");
adamc@1260 710 } catch (e) {
adamc@1260 711 try {
adamc@1260 712 return new ActiveXObject("Microsoft.XMLHTTP");
adamc@1260 713 } catch (e) {
adamc@1260 714 whine("Your browser doesn't seem to support AJAX.");
adamc@1260 715 }
adamc@1260 716 }
adamc@609 717 }
adamc@609 718 }
adamc@609 719
adamc@736 720 var sig = null;
adamc@736 721
adamc@1042 722 var unloading = false, inFlight = null;
adamc@1042 723
adamc@1042 724 function unload() {
adamc@1260 725 unloading = true;
adamc@1042 726
adamc@1260 727 for (; inFlight; inFlight = inFlight.next) {
adamc@1260 728 inFlight.data.abort();
adamc@1260 729 }
adamc@1042 730 }
adamc@1042 731
adamc@736 732 function requestUri(xhr, uri, needsSig) {
adamc@1260 733 if (unloading)
adamc@1260 734 return;
adamc@1042 735
adamc@1260 736 xhr.open("POST", uri, true);
adamc@1260 737 xhr.setRequestHeader("Content-type", "text/plain");
adamc@1260 738 xhr.setRequestHeader("Content-length", "0");
adamc@1260 739 xhr.setRequestHeader("Connection", "close");
adamc@668 740
adamc@1260 741 if (client_id != null) {
adamc@1260 742 xhr.setRequestHeader("UrWeb-Client", client_id.toString());
adamc@1260 743 xhr.setRequestHeader("UrWeb-Pass", client_pass.toString());
adamc@1260 744 }
adamc@668 745
adamc@1260 746 if (needsSig) {
adamc@1260 747 if (sig == null)
adamc@1260 748 whine("Missing cookie signature!");
adamc@736 749
adamc@1260 750 xhr.setRequestHeader("UrWeb-Sig", sig);
adamc@1260 751 }
adamc@736 752
adamc@1260 753 inFlight = cons(xhr, inFlight);
adamc@1260 754 xhr.send(null);
adamc@668 755 }
adamc@668 756
adamc@1042 757 function xhrFinished(xhr) {
adamc@1260 758 xhr.abort();
adamc@1260 759 inFlight = remove(xhr, inFlight);
adamc@1042 760 }
adamc@1042 761
adamc@1111 762 function unurlify(parse, s) {
adamc@1260 763 return parse(s);
adamc@1111 764 }
adamc@1111 765
adam@1385 766 function redirect(s) {
adam@1385 767 window.location = s;
adam@1385 768 }
adam@1385 769
adamc@978 770 function rc(prefix, uri, parse, k, needsSig) {
adamc@1260 771 uri = cat(prefix, uri);
adamc@1260 772 uri = flattenLocal(uri);
adamc@1260 773 var xhr = getXHR();
adamc@609 774
adamc@1260 775 xhr.onreadystatechange = function() {
adamc@1260 776 if (xhr.readyState == 4) {
adamc@1260 777 var isok = false;
adamc@612 778
adamc@1260 779 try {
adamc@1260 780 if (xhr.status == 200)
adamc@1260 781 isok = true;
adamc@1260 782 } catch (e) { }
adamc@612 783
adamc@1260 784 if (isok) {
adam@1446 785 var lines = xhr.responseText.split("\n");
adam@1446 786 if (lines.length != 2)
adam@1446 787 whine("Bad RPC response lines");
adam@1446 788
adam@1446 789 eval(lines[0]);
adam@1446 790
adamc@1260 791 try {
adam@1446 792 k(parse(lines[1]));
adamc@1260 793 } catch (v) {
adamc@1260 794 doExn(v);
adamc@1260 795 }
adamc@1260 796 } else {
adamc@1260 797 conn();
adamc@1260 798 }
adamc@1260 799
adamc@1260 800 xhrFinished(xhr);
adamc@729 801 }
adamc@1260 802 };
adamc@1042 803
adamc@1260 804 requestUri(xhr, uri, needsSig);
adamc@609 805 }
adamc@667 806
adamc@667 807 function path_join(s1, s2) {
adamc@1260 808 if (s1.length > 0 && s1.charAt(s1.length-1) == '/')
adamc@1260 809 return s1 + s2;
adamc@1260 810 else
adamc@1260 811 return s1 + "/" + s2;
adamc@667 812 }
adamc@667 813
adamc@670 814 var channels = [];
adamc@670 815
adamc@670 816 function newQueue() {
adamc@1260 817 return { front : null, back : null };
adamc@670 818 }
adamc@670 819 function enqueue(q, v) {
adamc@1260 820 if (q.front == null) {
adamc@1260 821 q.front = cons(v, null);
adamc@1260 822 q.back = q.front;
adamc@1260 823 } else {
adamc@1260 824 var node = cons(v, null);
adamc@1260 825 q.back.next = node;
adamc@1260 826 q.back = node;
adamc@1260 827 }
adamc@670 828 }
adamc@670 829 function dequeue(q) {
adamc@670 830 if (q.front == null)
adamc@1260 831 return null;
adamc@1260 832 else {
adamc@1260 833 var r = q.front.data;
adamc@1260 834 q.front = q.front.next;
adamc@1260 835 if (q.front == null)
adamc@1260 836 q.back = null;
adamc@1260 837 return r;
adamc@1260 838 }
adamc@670 839 }
adamc@670 840
adamc@670 841 function newChannel() {
adamc@1260 842 return { msgs : newQueue(), listeners : newQueue() };
adamc@670 843 }
adamc@670 844
adamc@667 845 function listener() {
adamc@1260 846 var uri = path_join(url_prefix, ".msgs");
adamc@1260 847 var xhr = getXHR();
adamc@1260 848 var tid, orsc, onTimeout;
adamc@673 849
adamc@1260 850 var connect = function () {
adamc@1260 851 xhr.onreadystatechange = orsc;
adamc@1260 852 tid = window.setTimeout(onTimeout, timeout * 500);
adamc@1260 853 requestUri(xhr, uri, false);
adamc@1260 854 }
adamc@673 855
adamc@1260 856 orsc = function() {
adamc@1260 857 if (xhr.readyState == 4) {
adamc@1260 858 window.clearTimeout(tid);
adamc@673 859
adamc@1260 860 var isok = false;
adamc@667 861
adamc@1260 862 try {
adamc@1260 863 if (xhr.status == 200)
adamc@1260 864 isok = true;
adamc@1260 865 } catch (e) { }
adamc@667 866
adamc@1260 867 if (isok) {
adam@1447 868 var text = xhr.responseText;
adamc@1260 869 if (text == "")
adamc@1260 870 return;
adamc@1260 871 var lines = text.split("\n");
adamc@889 872
adamc@1260 873 if (lines.length < 2) {
adamc@1260 874 discon();
adamc@1260 875 return;
adamc@1260 876 }
adamc@1260 877
adam@1447 878 var messageReader = function(i) {
adam@1447 879 if (i+1 >= lines.length) {
adam@1447 880 xhrFinished(xhr);
adam@1447 881 connect();
adam@1447 882 }
adam@1447 883 else {
adam@1447 884 var chn = lines[i];
adam@1447 885 var msg = lines[i+1];
adamc@1260 886
adam@1447 887 if (chn == "E") {
adam@1447 888 eval(msg);
adam@1447 889 window.setTimeout(function() { messageReader(i+2); }, 0);
adam@1447 890 } else {
adam@1447 891 if (chn < 0)
adam@1447 892 whine("Out-of-bounds channel in message from remote server");
adamc@1260 893
adam@1447 894 var ch;
adamc@1260 895
adam@1447 896 if (chn >= channels.length || channels[chn] == null) {
adam@1447 897 ch = newChannel();
adam@1447 898 channels[chn] = ch;
adam@1447 899 } else
adam@1447 900 ch = channels[chn];
adamc@1260 901
adam@1447 902 var listener = dequeue(ch.listeners);
adam@1447 903 if (listener == null) {
adam@1447 904 enqueue(ch.msgs, msg);
adam@1447 905 } else {
adam@1447 906 try {
adam@1447 907 listener(msg);
adam@1447 908 } catch (v) {
adam@1447 909 doExn(v);
adam@1447 910 }
adam@1447 911 }
adam@1447 912
adam@1447 913 messageReader(i+2);
adamc@1260 914 }
adamc@1260 915 }
adamc@1260 916 }
adamc@1260 917
adam@1447 918 messageReader(0);
adamc@1260 919 }
adamc@1260 920 else {
adamc@1260 921 try {
adamc@1260 922 if (xhr.status != 0)
adamc@1260 923 servErr("Error querying remote server for messages: " + xhr.status);
adamc@1260 924 } catch (e) { }
adamc@1260 925 }
adamc@729 926 }
adamc@1260 927 };
adamc@669 928
adamc@1260 929 onTimeout = function() {
adamc@1260 930 xhrFinished(xhr);
adamc@1260 931 connect();
adamc@1260 932 };
adamc@670 933
adamc@673 934 connect();
adamc@667 935 }
adamc@670 936
adamc@670 937 function rv(chn, parse, k) {
adamc@1260 938 if (chn == null)
adamc@1260 939 return;
adamc@682 940
adamc@1260 941 if (chn < 0)
adamc@1260 942 whine("Out-of-bounds channel receive");
adamc@670 943
adamc@1260 944 var ch;
adamc@670 945
adamc@1260 946 if (chn >= channels.length || channels[chn] == null) {
adamc@1260 947 ch = newChannel();
adamc@1260 948 channels[chn] = ch;
adamc@1260 949 } else
adamc@1260 950 ch = channels[chn];
adamc@670 951
adamc@1260 952 var msg = dequeue(ch.msgs);
adamc@1260 953 if (msg == null) {
adamc@1260 954 enqueue(ch.listeners, function(msg) { k(parse(msg)); });
adamc@1260 955 } else {
adamc@1260 956 try {
adamc@1260 957 k(parse(msg));
adamc@1260 958 } catch (v) {
adamc@1260 959 doExn(v);
adamc@1260 960 }
adamc@728 961 }
adamc@670 962 }
adamc@693 963
adamc@978 964 function sl(ms, k) {
adamc@1260 965 window.setTimeout(function() { k(null); }, ms);
adamc@1021 966 }
adamc@1021 967
adamc@1021 968 function sp(e) {
adamc@1260 969 execF(e, null);
adamc@978 970 }
adamc@978 971
adamc@693 972
adamc@895 973 // Key events
adamc@895 974
adamc@970 975 var uw_event = null;
adamc@970 976
adamc@970 977 function kc() {
adam@1290 978 return window.event ? event.keyCode : (uw_event ? uw_event.keyCode : 0);
adamc@970 979 }
adamc@970 980
adamc@970 981
adamc@970 982 // The Ur interpreter
adamc@970 983
adamc@970 984 var urfuncs = [];
adamc@970 985
adamc@970 986 function lookup(env, n) {
adamc@1260 987 while (env != null) {
adamc@1260 988 if (n == 0)
adamc@1260 989 return env.data;
adamc@1260 990 else {
adamc@1260 991 --n;
adamc@1260 992 env = env.next;
adamc@1260 993 }
adamc@970 994 }
adamc@970 995
adamc@1260 996 whine("Out-of-bounds Ur variable reference");
adamc@970 997 }
adamc@970 998
adamc@974 999 function execP(env, p, v) {
adamc@1260 1000 switch (p.c) {
adamc@1260 1001 case "w":
adamc@1260 1002 return env;
adamc@1260 1003 case "v":
adamc@1260 1004 return cons(v, env);
adamc@1260 1005 case "c":
adamc@1260 1006 if (v == p.v)
adamc@1260 1007 return env;
adamc@1260 1008 else
adamc@1260 1009 return false;
adamc@1260 1010 case "s":
adamc@1260 1011 if (v == null)
adamc@1260 1012 return false;
adamc@1260 1013 else
adamc@1260 1014 return execP(env, p.p, p.n ? v.v : v);
adamc@1260 1015 case "1":
adamc@1260 1016 if (v.n != p.n)
adamc@1260 1017 return false;
adamc@1260 1018 else
adamc@1260 1019 return execP(env, p.p, v.v);
adamc@1260 1020 case "r":
adamc@1260 1021 for (var fs = p.l; fs != null; fs = fs.next) {
adamc@1260 1022 env = execP(env, fs.data.p, v["_" + fs.data.n]);
adamc@1260 1023 if (env == false)
adamc@1260 1024 return false;
adamc@1260 1025 }
adamc@1260 1026 return env;
adamc@1260 1027 default:
adamc@1260 1028 whine("Unknown Ur pattern kind" + p.c);
adamc@974 1029 }
adamc@974 1030 }
adamc@974 1031
adamc@970 1032 function exec0(env, e) {
adamc@1260 1033 return exec1(env, null, e);
adamc@1020 1034 }
adamc@1020 1035
adamc@1020 1036 function exec1(env, stack, e) {
adamc@1260 1037 var stack, usedK = false;
adamc@970 1038
adamc@1260 1039 var saveEnv = function() {
adamc@1260 1040 if (stack.next != null && stack.next.data.c != "<")
adamc@1260 1041 stack = cons({c: "<", env: env}, stack.next);
adamc@1260 1042 else
adamc@1260 1043 stack = stack.next;
adamc@1260 1044 };
adamc@983 1045
adamc@1260 1046 while (true) {
adamc@1260 1047 switch (e.c) {
adamc@1260 1048 case "c":
adamc@1260 1049 var v = e.v;
adamc@1260 1050 if (stack == null)
adamc@1260 1051 return v;
adamc@1260 1052 var fr = stack.data;
adamc@970 1053
adamc@1260 1054 switch (fr.c) {
adamc@1260 1055 case "s":
adamc@1260 1056 e = {c: "c", v: {v: v}};
adamc@1260 1057 stack = stack.next;
adamc@1260 1058 break;
adamc@1260 1059 case "1":
adamc@1260 1060 e = {c: "c", v: {n: fr.n, v: v}};
adamc@1260 1061 stack = stack.next;
adamc@1260 1062 break;
adamc@1260 1063 case "f":
adamc@1260 1064 fr.args[fr.pos++] = v;
adamc@1260 1065 if (fr.a == null) {
adamc@1260 1066 var res;
adamc@1260 1067 stack = stack.next;
adamc@1035 1068
adamc@1260 1069 if (fr.f.apply)
adamc@1260 1070 res = fr.f.apply(null, fr.args);
adamc@1260 1071 else if (fr.args.length == 0)
adamc@1260 1072 res = fr.f();
adamc@1260 1073 else if (fr.args.length == 1)
adamc@1260 1074 res = fr.f(fr.args[0]);
adamc@1260 1075 else if (fr.args.length == 2)
adamc@1260 1076 res = fr.f(fr.args[0], fr.args[1]);
adamc@1260 1077 else if (fr.args.length == 3)
adamc@1260 1078 res = fr.f(fr.args[0], fr.args[1], fr.args[2]);
adamc@1260 1079 else if (fr.args.length == 4)
adamc@1260 1080 res = fr.f(fr.args[0], fr.args[1], fr.args[2], fr.args[3]);
adamc@1260 1081 else if (fr.args.length == 5)
adamc@1260 1082 res = fr.f(fr.args[0], fr.args[1], fr.args[2], fr.args[3], fr.args[4]);
adamc@1260 1083 else
adamc@1260 1084 whine("Native function has " + fr.args.length + " args, but there is no special case for that count.");
adamc@1035 1085
adamc@1260 1086 e = {c: "c", v: res};
adamc@1260 1087 if (usedK) return null;
adamc@1260 1088 } else {
adamc@1260 1089 e = fr.a.data;
adamc@1260 1090 fr.a = fr.a.next;
adamc@1260 1091 }
adamc@1260 1092 break;
adamc@1260 1093 case "a1":
adamc@1260 1094 e = fr.x;
adamc@1260 1095 stack = cons({c: "a2", f: v}, stack.next);
adamc@1260 1096 break;
adamc@1260 1097 case "a2":
adamc@1260 1098 if (fr.f == null)
adamc@1260 1099 whine("Ur: applying null function");
adamc@1260 1100 else if (fr.f.body) {
adamc@1260 1101 saveEnv();
adamc@1260 1102 env = cons(v, fr.f.env);
adamc@1260 1103 e = fr.f.body;
adamc@1260 1104 } else {
adamc@1260 1105 e = {c: "c", v: fr.f(v)};
adamc@1260 1106 stack = stack.next;
adamc@1260 1107 }
adamc@1260 1108 break;
adamc@1260 1109 case "<":
adamc@1260 1110 env = fr.env;
adamc@1260 1111 stack = stack.next;
adamc@1260 1112 break;
adamc@1260 1113 case "r":
adamc@1260 1114 fr.fs["_" + fr.n] = v;
adamc@1260 1115 if (fr.l == null) {
adamc@1260 1116 e = {c: "c", v: fr.fs};
adamc@1260 1117 stack = stack.next;
adamc@1260 1118 } else {
adamc@1260 1119 fr.n = fr.l.data.n;
adamc@1260 1120 e = fr.l.data.v;
adamc@1260 1121 fr.l = fr.l.next;
adamc@1260 1122 }
adamc@1260 1123 break;
adamc@1260 1124 case ".":
adamc@1260 1125 e = {c: "c", v: v["_" + fr.f]};
adamc@1260 1126 stack = stack.next;
adamc@1260 1127 break;
adamc@1260 1128 case ";":
adamc@1260 1129 e = fr.e2;
adamc@1260 1130 stack = stack.next;
adamc@1260 1131 break;
adamc@1260 1132 case "=":
adamc@1260 1133 saveEnv();
adamc@1260 1134 env = cons(v, env);
adamc@1260 1135 e = fr.e2;
adamc@1260 1136 break;
adamc@1260 1137 case "m":
adamc@1260 1138 var ps;
adamc@1260 1139 for (ps = fr.p; ps != null; ps = ps.next) {
adamc@1260 1140 var r = execP(env, ps.data.p, v);
adamc@1260 1141 if (r != false) {
adamc@1260 1142 saveEnv();
adamc@1260 1143 env = r;
adamc@1260 1144 e = ps.data.b;
adamc@1260 1145 break;
adamc@1260 1146 }
adamc@1260 1147 }
adamc@1260 1148 if (ps == null)
adamc@1260 1149 whine("Match failure in Ur interpretation");
adamc@1260 1150 break;
adamc@1260 1151 default:
adamc@1260 1152 whine("Unknown Ur continuation kind " + fr.c);
adamc@1260 1153 }
adamc@1260 1154
adamc@1260 1155 break;
adamc@1260 1156 case "v":
adamc@1260 1157 e = {c: "c", v: lookup(env, e.n)};
adamc@1260 1158 break;
adamc@1260 1159 case "n":
adamc@1260 1160 var idx = e.n;
adamc@1260 1161 e = urfuncs[idx];
adamc@1260 1162 if (e.c == "t")
adamc@1262 1163 e = urfuncs[idx] = eval("(" + e.f + ")");
adamc@1260 1164 break;
adamc@1260 1165 case "s":
adamc@1260 1166 stack = cons({c: "s"}, stack);
adamc@1260 1167 e = e.v;
adamc@1260 1168 break;
adamc@1260 1169 case "1":
adamc@1260 1170 stack = cons({c: "1", n: e.n}, stack);
adamc@1260 1171 e = e.v;
adamc@1260 1172 break;
adamc@1260 1173 case "f":
adamc@1260 1174 if (e.a == null)
adamc@1260 1175 e = {c: "c", v: (eval(e.f))()};
adamc@1260 1176 else {
adamc@1260 1177 var args = [];
adamc@1260 1178 stack = cons({c: "f", f: eval(e.f), args: args, pos: 0, a: e.a.next}, stack);
adamc@1260 1179 if (!e.a.data.c) alert("[2] fr.f = " + e.f + "; 0 = " + e.a.data);
adamc@1260 1180 e = e.a.data;
adamc@1260 1181 }
adamc@1260 1182 break;
adamc@1260 1183 case "l":
adamc@1260 1184 e = {c: "c", v: {env: env, body: e.b}};
adamc@1260 1185 break;
adamc@1260 1186 case "a":
adamc@1260 1187 stack = cons({c: "a1", x: e.x}, stack);
adamc@1260 1188 e = e.f;
adamc@1260 1189 break;
adamc@1260 1190 case "r":
adamc@1260 1191 if (e.l == null)
adamc@1260 1192 whine("Empty Ur record in interpretation");
adamc@1260 1193 var fs = {};
adamc@1260 1194 stack = cons({c: "r", n: e.l.data.n, fs: fs, l: e.l.next}, stack);
adamc@1260 1195 e = e.l.data.v;
adamc@1260 1196 break;
adamc@1260 1197 case ".":
adamc@1260 1198 stack = cons({c: ".", f: e.f}, stack);
adamc@1260 1199 e = e.r;
adamc@1260 1200 break;
adamc@1260 1201 case ";":
adamc@1260 1202 stack = cons({c: ";", e2: e.e2}, stack);
adamc@1260 1203 e = e.e1;
adamc@1260 1204 break;
adamc@1260 1205 case "=":
adamc@1260 1206 stack = cons({c: "=", e2: e.e2}, stack);
adamc@1260 1207 e = e.e1;
adamc@1260 1208 break;
adamc@1260 1209 case "m":
adamc@1260 1210 stack = cons({c: "m", p: e.p}, stack);
adamc@1260 1211 e = e.e;
adamc@1260 1212 break;
adamc@1260 1213 case "e":
adamc@1260 1214 e = {c: "c", v: cs({c: "wc", env: env, body: e.e})};
adamc@1260 1215 break;
adamc@1260 1216 case "wc":
adamc@1260 1217 env = e.env;
adamc@1260 1218 e = e.body;
adamc@1260 1219 break;
adamc@1260 1220 case "K":
adamc@1260 1221 { var savedStack = stack.next, savedEnv = env;
adamc@1260 1222 e = {c: "c", v: function(v) { return exec1(savedEnv, savedStack, {c: "c", v: v}); } };}
adamc@1260 1223 usedK = true;
adamc@1260 1224 break;
adamc@1260 1225 default:
adamc@1260 1226 whine("Unknown Ur expression kind " + e.c);
adamc@970 1227 }
adamc@970 1228 }
adamc@970 1229 }
adamc@970 1230
adamc@976 1231 function execD(e) {
adamc@1260 1232 return exec0(null, e);
adamc@976 1233 }
adamc@976 1234
adamc@970 1235 function exec(e) {
adamc@1260 1236 var r = exec0(null, e);
adamc@970 1237
adamc@1260 1238 if (r != null && r.body != null)
adamc@1260 1239 return function(v) { return exec0(cons(v, r.env), r.body); };
adamc@1260 1240 else
adamc@1260 1241 return r;
adamc@895 1242 }
adamc@895 1243
adamc@977 1244 function execF(f, x) {
adamc@1260 1245 return exec0(cons(x, f.env), f.body);
adamc@977 1246 }
adamc@977 1247
adamc@895 1248
adam@1290 1249 // Wrappers
adam@1290 1250
adam@1290 1251 function confrm(s) {
adam@1290 1252 return confirm(s) ? true : false;
adam@1290 1253 }
adam@1290 1254
adam@1290 1255
adamc@1323 1256 // URL blessing
adamc@1323 1257
adamc@1323 1258 var urlRules = null;
adamc@1323 1259
adamc@1323 1260 function checkUrl(s) {
adamc@1323 1261 for (var r = urlRules; r; r = r.next) {
adamc@1323 1262 var ru = r.data;
adamc@1323 1263 if (ru.prefix ? s.indexOf(ru.pattern) == 0 : s == ru.pattern)
adamc@1323 1264 return ru.allow ? s : null;
adamc@1323 1265 }
adamc@1323 1266
adamc@1323 1267 return null;
adamc@1323 1268 }
adamc@1323 1269
adamc@1323 1270 function bless(s) {
adamc@1323 1271 u = checkUrl(s);
adamc@1323 1272 if (u == null)
adamc@1323 1273 er("Disallowed URL: " + s);
adamc@1323 1274 return u;
adamc@1323 1275 }
adamc@1323 1276
adamc@693 1277 // App-specific code
adamc@693 1278