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annotate lib/js/urweb.js @ 1413:45bd58736bb2

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Fix issues with empty page buffers for tasks
author Adam Chlipala <adam@chlipala.net>
date Sun, 23 Jan 2011 14:59:59 -0500
parents 449a12b82db7
children 36f7d1debb37
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
adamc@729 96 // Error handling
adamc@729 97
adamc@729 98 function whine(msg) {
adamc@1260 99 alert(msg);
adamc@1260 100 throw msg;
adamc@729 101 }
adamc@729 102
adamc@810 103 function pf(loc) {
adamc@1260 104 throw ("Pattern match failure (" + loc + ")");
adamc@729 105 }
adamc@729 106
adamc@798 107 function runHandlers(kind, ls, arg) {
adamc@1260 108 if (ls == null)
adamc@1260 109 alert(kind + ": " + arg);
adamc@1260 110 for (; ls; ls = ls.next)
adamc@1260 111 try {
adamc@1260 112 exec({c:"a", f:{c:"a", f:ls.data, x:{c:"c", v:arg}}, x:{c:"c", v:null}});
adamc@1260 113 } catch (v) { }
adamc@729 114 }
adamc@729 115
adamc@729 116 var errorHandlers = null;
adamc@729 117
adamc@729 118 function onError(f) {
adamc@1260 119 errorHandlers = cons(f, errorHandlers);
adamc@729 120 }
adamc@729 121
adamc@729 122 function er(s) {
adamc@1260 123 runHandlers("Error", errorHandlers, s);
adamc@1260 124 throw {uw_error: s};
adamc@729 125 }
adamc@729 126
adamc@729 127 var failHandlers = null;
adamc@729 128
adamc@729 129 function onFail(f) {
adamc@1260 130 failHandlers = cons(f, failHandlers);
adamc@729 131 }
adamc@729 132
adamc@729 133 function doExn(v) {
adamc@1260 134 if (v == null || v.uw_error == null) {
adamc@1260 135 var s = (v == null ? "null" : v.message ? v.message : v.toString());
adamc@1260 136 if (v != null && v.fileName && v.lineNumber)
adamc@1260 137 s += " (" + v.fileName + ":" + v.lineNumber + ")";
adamc@1260 138 runHandlers("Fail", failHandlers, s);
adamc@1260 139 }
adamc@729 140 }
adamc@729 141
adamc@729 142 var disconnectHandlers = null;
adamc@729 143
adamc@976 144 function flift(f) {
adamc@1260 145 return {env:cons(f,null), body:{c:"v", n:1}};
adamc@976 146 }
adamc@976 147
adamc@729 148 function onDisconnect(f) {
adamc@1260 149 disconnectHandlers = cons(flift(f), disconnectHandlers);
adamc@729 150 }
adamc@729 151
adamc@729 152 function discon() {
adamc@1260 153 runHandlers("Disconnect", disconnectHandlers, null);
adamc@729 154 }
adamc@729 155
adamc@729 156 var connectHandlers = null;
adamc@729 157
adamc@729 158 function onConnectFail(f) {
adamc@1260 159 connectHandlers = cons(flift(f), connectHandlers);
adamc@729 160 }
adamc@729 161
adamc@729 162 function conn() {
adamc@1260 163 runHandlers("Connect", connectHandlers, null);
adamc@729 164 }
adamc@729 165
adamc@729 166 var serverHandlers = null;
adamc@729 167
adamc@729 168 function onServerError(f) {
adamc@1260 169 serverHandlers = cons(f, serverHandlers);
adamc@729 170 }
adamc@729 171
adamc@729 172 function servErr(s) {
adamc@1260 173 window.setTimeout(function () { runHandlers("Server", serverHandlers, s); }, 0);
adamc@729 174 }
adamc@729 175
adamc@729 176
adamc@692 177 // Embedding closures in XML strings
adamc@692 178
adamc@693 179 function cs(f) {
adamc@1260 180 return {closure: f};
adamc@693 181 }
adamc@693 182
adamc@693 183 function isWeird(v) {
adamc@1260 184 return v.closure != null || v.cat1 != null;
adamc@693 185 }
adamc@693 186
adamc@692 187 function cat(s1, s2) {
adamc@1260 188 if (isWeird(s1) || isWeird(s2))
adamc@1260 189 return {cat1: s1, cat2: s2};
adamc@1260 190 else
adamc@1260 191 return s1 + s2;
adamc@692 192 }
adamc@692 193
adamc@692 194 var closures = [];
adamc@703 195 var freeClosures = null;
adamc@692 196
adamc@692 197 function newClosure(f) {
adamc@1260 198 var n;
adamc@1260 199 if (freeClosures == null) {
adamc@1260 200 n = closures.length;
adamc@1260 201 } else {
adamc@1260 202 n = freeClosures.data;
adamc@1260 203 freeClosures = freeClosures.next;
adamc@1260 204 }
adamc@1260 205 closures[n] = f;
adamc@1260 206 return n;
adamc@692 207 }
adamc@692 208
adamc@703 209 function freeClosure(n) {
adamc@1260 210 closures[n] = null;
adamc@1260 211 freeClosures = cons(n, freeClosures);
adamc@703 212 }
adamc@703 213
adamc@692 214 function cr(n) {
adamc@1260 215 return closures[n];
adamc@692 216 }
adamc@692 217
adamc@703 218 function flatten(cls, tr) {
adamc@1260 219 if (tr.cat1 != null)
adamc@1260 220 return flatten(cls, tr.cat1) + flatten(cls, tr.cat2);
adamc@1260 221 else if (tr.closure != null) {
adamc@1260 222 var cl = newClosure(tr.closure);
adamc@1260 223 cls.v = cons(cl, cls.v);
adamc@1260 224 return "cr(" + cl + ")";
adamc@1260 225 } else
adamc@1260 226 return tr;
adamc@692 227 }
adamc@692 228
adamc@728 229 function flattenLocal(s) {
adamc@1260 230 var cls = {v : null};
adamc@1260 231 var r = flatten(cls, s);
adamc@1260 232 for (cl = cls.v; cl != null; cl = cl.next)
adamc@1260 233 freeClosure(cl.data);
adamc@1260 234 return r;
adamc@728 235 }
adamc@728 236
adamc@692 237
adamc@692 238
adamc@692 239 // Dynamic tree management
adamc@692 240
adamc@690 241 function populate(node) {
adamc@1260 242 var s = node.signal;
adamc@1260 243 var oldSources = node.sources;
adamc@1260 244 try {
adamc@1260 245 var sr = execF(s, null);
adamc@1260 246 var newSources = sr._sources;
adamc@690 247
adamc@1260 248 for (var sp = oldSources; sp; sp = sp.next)
adamc@1260 249 if (!member(sp.data, newSources))
adamc@1260 250 sp.data.dyns = remove(node, sp.data.dyns);
adamc@690 251
adamc@1260 252 for (var sp = newSources; sp; sp = sp.next)
adamc@1260 253 if (!member(sp.data, oldSources))
adamc@1260 254 sp.data.dyns = cons(node, sp.data.dyns);
adamc@690 255
adamc@1260 256 node.sources = newSources;
adamc@1260 257 node.recreate(sr._data);
adamc@1260 258 } catch (v) {
adamc@1260 259 doExn(v);
adamc@1260 260 }
adamc@579 261 }
adamc@574 262
adamc@580 263 function sc(v) {
adamc@1260 264 return {data : v, dyns : null};
adamc@580 265 }
adamc@580 266 function sv(s, v) {
adamc@1260 267 s.data = v;
adamc@967 268
adamc@1260 269 for (var ls = s.dyns; ls; ls = ls.next)
adamc@1260 270 if (!ls.dead)
adamc@1260 271 populate(ls.data);
adamc@580 272 }
adamc@601 273 function sg(s) {
adamc@1260 274 return s.data;
adamc@601 275 }
adamc@579 276
adamc@580 277 function ss(s) {
adamc@1260 278 return {env:cons(s, null), body:{c:"r", l:
adamc@1260 279 cons({n:"sources", v:{c:"c", v:cons(s, null)}},
adamc@1260 280 cons({n:"data", v:{c:"f", f:sg, a:cons({c:"v", n:1}, null)}}, null))}};
adamc@580 281 }
adamc@580 282 function sr(v) {
adamc@1260 283 return {env:null, body:{c:"c", v:{_sources : null, _data : v}}};
adamc@580 284 }
adamc@580 285 function sb(x,y) {
adamc@1260 286 return {env:cons(y,cons(x,null)),
adamc@1260 287 body:{c:"=",
adamc@1260 288 e1:{c:"a", f:{c:"v", n:2}, x:{c:"c", v:null}},
adamc@1260 289 e2:{c:"=",
adamc@1260 290 e1:{c:"a",
adamc@1260 291 f:{c:"a", f:{c:"v", n:2}, x:{c:".", r:{c:"v", n:0}, f:"data"}},
adamc@1260 292 x:{c:"c", v:null}},
adamc@1260 293 e2:{c:"r", l:cons(
adamc@1260 294 {n:"sources", v:{c:"f", f:union, a:cons({c:".", r:{c:"v", n:1}, f:"sources"},
adamc@1260 295 cons({c:".", r:{c:"v", n:0}, f:"sources"}, null))}},
adamc@1260 296 cons({n:"data", v:{c:".", r:{c:"v", n:0}, f:"data"}}, null))}}}};
adamc@580 297 }
adamc@841 298 function scur(s) {
adamc@1260 299 return execF(s, null)._data;
adamc@841 300 }
adamc@571 301
adamc@604 302 function lastParent() {
adamc@1260 303 var pos = document.body;
adamc@604 304
adamc@1260 305 while (pos.lastChild && pos.lastChild.nodeType == 1)
adamc@1260 306 pos = pos.lastChild;
adamc@600 307
adamc@1260 308 pos = pos.parentNode;
adamc@1039 309
adamc@1260 310 return pos;
adamc@600 311 }
adamc@600 312
adamc@898 313 function parent() {
adamc@1260 314 return thisScript ? thisScript.parentNode : lastParent();
adamc@898 315 }
adamc@898 316
adamc@604 317 function addNode(node) {
adamc@1260 318 if (thisScript)
adamc@1260 319 thisScript.parentNode.replaceChild(node, thisScript);
adamc@1260 320 else
adamc@1260 321 lastParent().appendChild(node);
adamc@603 322 }
adamc@603 323
adamc@690 324 var thisScript = null;
adamc@690 325
adamc@604 326 function runScripts(node) {
adamc@1260 327 if (node.getElementsByTagName) {
adamc@1260 328 var savedScript = thisScript;
adamc@603 329
adamc@1260 330 var scripts = node.getElementsByTagName("script"), scriptsCopy = [];
adamc@1260 331 var len = scripts.length;
adamc@1260 332 for (var i = 0; i < len; ++i)
adamc@1260 333 scriptsCopy[i] = scripts[i];
adamc@1260 334 for (var i = 0; i < len; ++i) {
adamc@1260 335 thisScript = scriptsCopy[i];
adamc@1039 336
adamc@1260 337 try {
adamc@1260 338 eval(thisScript.text);
adamc@1260 339 } catch (v) {
adamc@1260 340 doExn(v);
adamc@1260 341 }
adamc@1260 342 if (thisScript.parentNode)
adamc@1260 343 thisScript.parentNode.removeChild(thisScript);
adamc@1260 344 }
adamc@1260 345
adamc@1260 346 thisScript = savedScript;
adamc@729 347 }
adamc@603 348 }
adamc@603 349
adamc@603 350
adamc@692 351 // Dynamic tree entry points
adamc@692 352
adamc@967 353 function killScript(scr) {
adamc@1260 354 scr.dead = true;
adamc@1260 355 for (var ls = scr.sources; ls; ls = ls.next)
adamc@1260 356 ls.data.dyns = remove(scr, ls.data.dyns);
adamc@1260 357 for (var ls = scr.closures; ls; ls = ls.next)
adamc@1260 358 freeClosure(ls.data);
adamc@967 359 }
adamc@967 360
adamc@901 361 function dyn(pnode, s) {
adamc@1260 362 var x = document.createElement("script");
adamc@1260 363 x.dead = false;
adamc@1260 364 x.signal = s;
adamc@1260 365 x.sources = null;
adamc@1260 366 x.closures = null;
adamc@899 367
adamc@1260 368 var firstChild = null;
adamc@899 369
adamc@1260 370 x.recreate = function(v) {
adamc@1260 371 for (var ls = x.closures; ls; ls = ls.next)
adamc@1260 372 freeClosure(ls.data);
adamc@945 373
adamc@946 374 var next;
adamc@1260 375 for (var child = firstChild; child && child != x; child = next) {
adamc@1260 376 next = child.nextSibling;
adamc@1260 377
adamc@1260 378 killScript(child);
adamc@1260 379 if (child.getElementsByTagName) {
adamc@1260 380 var arr = child.getElementsByTagName("script");
adamc@1260 381 for (var i = 0; i < arr.length; ++i)
adamc@1260 382 killScript(arr[i]);
adamc@1260 383 }
adamc@1260 384
adamc@1260 385 if (child.parentNode)
adamc@1260 386 child.parentNode.removeChild(child);
adamc@946 387 }
adamc@903 388
adamc@1260 389 var cls = {v : null};
adamc@1260 390 var html = flatten(cls, v);
adamc@1260 391 if (pnode != "table" && pnode != "tr")
adamc@1260 392 html = dynPrefix + html;
adamc@1260 393 x.closures = cls.v;
adamc@946 394
adamc@1260 395 if (pnode == "table") {
adamc@1260 396 var dummy = document.createElement("body");
adamc@1260 397 dummy.innerHTML = "<table>" + html + "</table>";
adamc@1260 398 runScripts(dummy);
adamc@1260 399 var table = x.parentNode;
adamc@1260 400
adamc@1260 401 if (table) {
adamc@1260 402 firstChild = null;
adamc@1260 403 var tbody;
adamc@1260 404
adamc@1260 405 var arr = dummy.getElementsByTagName("tbody");
adamc@1260 406
adamc@1260 407 var tbody;
adamc@1260 408 if (arr.length > 0 && arr[0].parentNode == dummy.firstChild) {
adamc@1260 409 tbody = arr[0];
adamc@1260 410 var next;
adamc@1260 411 for (var node = dummy.firstChild.firstChild; node; node = next) {
adamc@1260 412 next = node.nextSibling;
adamc@1260 413
adamc@1260 414 if (node.tagName != "TBODY")
adamc@1260 415 tbody.appendChild(node);
adamc@1260 416 }
adamc@1260 417 } else
adamc@1260 418 tbody = dummy.firstChild;
adamc@1260 419
adamc@1260 420 var next;
adamc@1260 421 firstChild = document.createElement("script");
adamc@1260 422 table.insertBefore(firstChild, x);
adamc@1260 423 for (var node = tbody.firstChild; node; node = next) {
adamc@1260 424 next = node.nextSibling;
adamc@1260 425 table.insertBefore(node, x);
adamc@1260 426 }
adamc@1260 427 }
adamc@1260 428 } else if (pnode == "tr") {
adamc@1260 429 var dummy = document.createElement("body");
adamc@1260 430 dummy.innerHTML = "<table><tr>" + html + "</tr></table>";
adamc@1260 431 runScripts(dummy);
adamc@1260 432 var table = x.parentNode;
adamc@1260 433
adamc@1260 434 if (table) {
adamc@1260 435 var arr = dummy.getElementsByTagName("tr");
adamc@1260 436 firstChild = null;
adamc@1260 437 var tr;
adamc@1260 438 if (arr.length > 0 && table != null)
adamc@1260 439 tr = arr[0];
adamc@1260 440 else
adamc@1260 441 tr = 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 = tr.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 {
adamc@1260 452 firstChild = document.createElement("span");
adamc@1260 453 firstChild.innerHTML = html;
adamc@1260 454 runScripts(firstChild);
adamc@1260 455 if (x.parentNode)
adamc@1260 456 x.parentNode.insertBefore(firstChild, x);
adamc@903 457 }
adamc@1260 458 };
adamc@899 459
adamc@1260 460 addNode(x);
adamc@1260 461 populate(x);
adamc@571 462 }
adamc@582 463
adamc@1040 464 function input(x, s, recreate, type) {
adamc@1260 465 if (type) x.type = type;
adamc@1260 466 x.dead = false;
adamc@1260 467 x.signal = ss(s);
adamc@1260 468 x.sources = null;
adamc@1260 469 x.recreate = recreate(x);
adamc@1260 470 addNode(x);
adamc@1260 471 populate(x);
adamc@816 472
adamc@1260 473 return x;
adamc@816 474 }
adamc@816 475
adamc@816 476 function inp(s) {
adamc@1260 477 var x = input(document.createElement("input"), s,
adamc@1260 478 function(x) { return function(v) { if (x.value != v) x.value = v; }; });
adamc@1260 479 x.value = s.data;
adamc@1260 480 x.onkeyup = function() { sv(s, x.value) };
adamc@816 481
adamc@1260 482 return x;
adamc@816 483 }
adamc@816 484
adamc@816 485 function sel(s, content) {
adamc@1260 486 var dummy = document.createElement("span");
adamc@1260 487 dummy.innerHTML = "<select>" + content + "</select>";
adamc@1260 488 var x = input(dummy.firstChild, s, function(x) { return function(v) { if (x.value != v) x.value = v; }; });
adamc@1260 489 x.value = s.data;
adamc@1260 490 if (x.value != s.data)
adamc@1260 491 sv(s, x.value);
adamc@1260 492 x.onchange = function() { sv(s, x.value) };
adamc@797 493
adamc@1260 494 return x;
adamc@598 495 }
adamc@598 496
adamc@817 497 function chk(s) {
adamc@1260 498 var x = input(document.createElement("input"), s,
adamc@1260 499 function(x) { return function(v) { if (x.checked != v) x.checked = v; }; }, "checkbox");
adamc@1260 500 x.defaultChecked = x.checked = s.data;
adamc@1260 501 x.onclick = function() { sv(s, x.checked) };
adamc@817 502
adamc@1260 503 return x;
adamc@817 504 }
adamc@817 505
adamc@1099 506 function tbx(s) {
adamc@1260 507 var x = input(document.createElement("textarea"), s,
adamc@1260 508 function(x) { return function(v) { if (x.innerHTML != v) x.innerHTML = v; }; });
adamc@1260 509 x.innerHTML = s.data;
adamc@1260 510 x.onkeyup = function() { sv(s, x.value) };
adamc@1099 511
adamc@1260 512 return x;
adamc@1099 513 }
adamc@1099 514
adamc@800 515 function addOnChange(x, f) {
adamc@1260 516 var old = x.onchange;
adam@1290 517 if (old == null)
adam@1290 518 x.onchange = f;
adam@1290 519 else
adam@1290 520 x.onchange = function() { old(); f(); };
adam@1290 521 }
adam@1290 522
adam@1290 523 function addOnKeyUp(x, f) {
adam@1290 524 var old = x.onkeyup;
adam@1290 525 if (old == null)
adam@1290 526 x.onkeyup = f;
adam@1290 527 else
adam@1290 528 x.onkeyup = function(x) { old(x); f(x); };
adamc@800 529 }
adamc@800 530
adamc@692 531
adamc@692 532 // Basic string operations
adamc@692 533
adamc@597 534 function eh(x) {
adamc@1260 535 if (x == null)
adamc@1260 536 return "NULL";
adamc@1260 537 else
adamc@1260 538 return x.split("&").join("&amp;").split("<").join("&lt;").split(">").join("&gt;");
adamc@597 539 }
adamc@597 540
adamc@582 541 function ts(x) { return x.toString() }
adamc@586 542 function bs(b) { return (b ? "True" : "False") }
adamc@586 543
adamc@1057 544 function id(x) { return x; }
adamc@1038 545 function sub(s, i) { return s.charAt(i); }
adamc@828 546 function suf(s, i) { return s.substring(i); }
adamc@828 547 function slen(s) { return s.length; }
adamc@829 548 function sidx(s, ch) {
adamc@1260 549 var r = s.indexOf(ch);
adamc@1260 550 if (r == -1)
adamc@1260 551 return null;
adamc@1260 552 else
adamc@1260 553 return r;
adamc@829 554 }
adamc@831 555 function sspn(s, chs) {
adamc@1260 556 for (var i = 0; i < s.length; ++i)
adamc@1260 557 if (chs.indexOf(s.charAt(i)) != -1)
adamc@1260 558 return i;
adamc@831 559
adamc@1260 560 return null;
adamc@831 561 }
adamc@829 562 function schr(s, ch) {
adamc@1260 563 var r = s.indexOf(ch);
adamc@1260 564 if (r == -1)
adamc@1260 565 return null;
adamc@1260 566 else
adamc@1260 567 return s.substring(r);
adamc@829 568 }
adamc@829 569 function ssub(s, start, len) {
adamc@1260 570 return s.substring(start, start+len);
adamc@829 571 }
adamc@821 572
adamc@649 573 function pi(s) {
adamc@1260 574 var r = parseInt(s);
adamc@1260 575 if (r.toString() == s)
adamc@1260 576 return r;
adamc@1260 577 else
adamc@1260 578 er("Can't parse int: " + s);
adamc@649 579 }
adamc@649 580
adamc@649 581 function pfl(s) {
adamc@1260 582 var r = parseFloat(s);
adamc@1260 583 if (r.toString() == s)
adamc@1260 584 return r;
adamc@1260 585 else
adamc@1260 586 er("Can't parse float: " + s);
adamc@649 587 }
adamc@649 588
adamc@838 589 function pio(s) {
adamc@1260 590 var r = parseInt(s);
adamc@1260 591 if (r.toString() == s)
adamc@1260 592 return r;
adamc@1260 593 else
adamc@1260 594 return null;
adamc@838 595 }
adamc@838 596
adamc@838 597 function pflo(s) {
adamc@1260 598 var r = parseFloat(s);
adamc@1260 599 if (r.toString() == s)
adamc@1260 600 return r;
adamc@1260 601 else
adamc@1260 602 return null;
adamc@838 603 }
adamc@838 604
adamc@692 605 function uf(s) {
adamc@1260 606 if (s.length == 0)
adamc@1260 607 return "_";
adamc@1260 608 s = s.replace(new RegExp ("\\.", "g"), ".2E");
adamc@1260 609 return (s.charAt(0) == '_' ? "_" : "") + encodeURIComponent(s).replace(new RegExp ("%", "g"), ".");
adamc@691 610 }
adamc@691 611
adamc@692 612 function uu(s) {
adamc@1260 613 if (s.length > 0 && s.charAt(0) == '_') {
adamc@1260 614 s = s.substring(1);
adamc@1260 615 } else if (s.length >= 3 && (s.charAt(0) == '%' || s.charAt(0) == '.')
adamc@1260 616 && s.charAt(1) == '5' && (s.charAt(2) == 'f' || s.charAt(2) == 'F'))
adamc@1260 617 s = s.substring(3);
adamc@1260 618 s = s.replace(new RegExp ("\\+", "g"), " ");
adamc@1260 619 s = s.replace(new RegExp ("\\.", "g"), "%");
adamc@1260 620 return decodeURIComponent(s);
adamc@905 621 }
adamc@905 622
adamc@1108 623 function atr(s) {
adamc@1260 624 return s.replace(new RegExp ("\"", "g"), "&quot;").replace(new RegExp ("&", "g"), "&amp;")
adamc@1260 625 }
adamc@1108 626
adamc@912 627 function ub(b) {
adamc@1260 628 return b ? "1" : "0";
adamc@912 629 }
adamc@912 630
adamc@905 631 function uul(getToken, getData) {
adamc@1260 632 var tok = getToken();
adamc@1260 633 if (tok == "Nil") {
adamc@1260 634 return null;
adamc@1260 635 } else if (tok == "Cons") {
adamc@1260 636 var d = getData();
adamc@1260 637 var l = uul(getToken, getData);
adamc@1260 638 return {_1:d, _2:l};
adamc@1260 639 } else
adamc@1260 640 whine("Can't unmarshal list (" + tok + ")");
adamc@692 641 }
adamc@692 642
adamc@961 643 function strcmp(str1, str2) {
adamc@1260 644 return ((str1 == str2) ? 0 : ((str1 > str2) ? 1 : -1));
adamc@961 645 }
adamc@692 646
adamc@603 647
adamc@692 648 // Remote calls
adamc@609 649
adamc@703 650 var client_id = null;
adamc@668 651 var client_pass = 0;
adamc@668 652 var url_prefix = "/";
adamc@673 653 var timeout = 60;
adamc@668 654
adamc@668 655 function getXHR(uri)
adamc@609 656 {
adamc@609 657 try {
adamc@1260 658 return new XMLHttpRequest();
adamc@609 659 } catch (e) {
adamc@1260 660 try {
adamc@1260 661 return new ActiveXObject("Msxml2.XMLHTTP");
adamc@1260 662 } catch (e) {
adamc@1260 663 try {
adamc@1260 664 return new ActiveXObject("Microsoft.XMLHTTP");
adamc@1260 665 } catch (e) {
adamc@1260 666 whine("Your browser doesn't seem to support AJAX.");
adamc@1260 667 }
adamc@1260 668 }
adamc@609 669 }
adamc@609 670 }
adamc@609 671
adamc@736 672 var sig = null;
adamc@736 673
adamc@1042 674 var unloading = false, inFlight = null;
adamc@1042 675
adamc@1042 676 function unload() {
adamc@1260 677 unloading = true;
adamc@1042 678
adamc@1260 679 for (; inFlight; inFlight = inFlight.next) {
adamc@1260 680 inFlight.data.abort();
adamc@1260 681 }
adamc@1042 682 }
adamc@1042 683
adamc@736 684 function requestUri(xhr, uri, needsSig) {
adamc@1260 685 if (unloading)
adamc@1260 686 return;
adamc@1042 687
adamc@1260 688 xhr.open("POST", uri, true);
adamc@1260 689 xhr.setRequestHeader("Content-type", "text/plain");
adamc@1260 690 xhr.setRequestHeader("Content-length", "0");
adamc@1260 691 xhr.setRequestHeader("Connection", "close");
adamc@668 692
adamc@1260 693 if (client_id != null) {
adamc@1260 694 xhr.setRequestHeader("UrWeb-Client", client_id.toString());
adamc@1260 695 xhr.setRequestHeader("UrWeb-Pass", client_pass.toString());
adamc@1260 696 }
adamc@668 697
adamc@1260 698 if (needsSig) {
adamc@1260 699 if (sig == null)
adamc@1260 700 whine("Missing cookie signature!");
adamc@736 701
adamc@1260 702 xhr.setRequestHeader("UrWeb-Sig", sig);
adamc@1260 703 }
adamc@736 704
adamc@1260 705 inFlight = cons(xhr, inFlight);
adamc@1260 706 xhr.send(null);
adamc@668 707 }
adamc@668 708
adamc@1042 709 function xhrFinished(xhr) {
adamc@1260 710 xhr.abort();
adamc@1260 711 inFlight = remove(xhr, inFlight);
adamc@1042 712 }
adamc@1042 713
adamc@1111 714 function unurlify(parse, s) {
adamc@1260 715 return parse(s);
adamc@1111 716 }
adamc@1111 717
adam@1385 718 function redirect(s) {
adam@1385 719 window.location = s;
adam@1385 720 }
adam@1385 721
adamc@978 722 function rc(prefix, uri, parse, k, needsSig) {
adamc@1260 723 uri = cat(prefix, uri);
adamc@1260 724 uri = flattenLocal(uri);
adamc@1260 725 var xhr = getXHR();
adamc@609 726
adamc@1260 727 xhr.onreadystatechange = function() {
adamc@1260 728 if (xhr.readyState == 4) {
adamc@1260 729 var isok = false;
adamc@612 730
adamc@1260 731 try {
adamc@1260 732 if (xhr.status == 200)
adamc@1260 733 isok = true;
adamc@1260 734 } catch (e) { }
adamc@612 735
adamc@1260 736 if (isok) {
adamc@1260 737 try {
adamc@1260 738 k(parse(xhr.responseText));
adamc@1260 739 } catch (v) {
adamc@1260 740 doExn(v);
adamc@1260 741 }
adamc@1260 742 } else {
adamc@1260 743 conn();
adamc@1260 744 }
adamc@1260 745
adamc@1260 746 xhrFinished(xhr);
adamc@729 747 }
adamc@1260 748 };
adamc@1042 749
adamc@1260 750 requestUri(xhr, uri, needsSig);
adamc@609 751 }
adamc@667 752
adamc@667 753 function path_join(s1, s2) {
adamc@1260 754 if (s1.length > 0 && s1.charAt(s1.length-1) == '/')
adamc@1260 755 return s1 + s2;
adamc@1260 756 else
adamc@1260 757 return s1 + "/" + s2;
adamc@667 758 }
adamc@667 759
adamc@670 760 var channels = [];
adamc@670 761
adamc@670 762 function newQueue() {
adamc@1260 763 return { front : null, back : null };
adamc@670 764 }
adamc@670 765 function enqueue(q, v) {
adamc@1260 766 if (q.front == null) {
adamc@1260 767 q.front = cons(v, null);
adamc@1260 768 q.back = q.front;
adamc@1260 769 } else {
adamc@1260 770 var node = cons(v, null);
adamc@1260 771 q.back.next = node;
adamc@1260 772 q.back = node;
adamc@1260 773 }
adamc@670 774 }
adamc@670 775 function dequeue(q) {
adamc@670 776 if (q.front == null)
adamc@1260 777 return null;
adamc@1260 778 else {
adamc@1260 779 var r = q.front.data;
adamc@1260 780 q.front = q.front.next;
adamc@1260 781 if (q.front == null)
adamc@1260 782 q.back = null;
adamc@1260 783 return r;
adamc@1260 784 }
adamc@670 785 }
adamc@670 786
adamc@670 787 function newChannel() {
adamc@1260 788 return { msgs : newQueue(), listeners : newQueue() };
adamc@670 789 }
adamc@670 790
adamc@667 791 function listener() {
adamc@1260 792 var uri = path_join(url_prefix, ".msgs");
adamc@1260 793 var xhr = getXHR();
adamc@1260 794 var tid, orsc, onTimeout;
adamc@673 795
adamc@1260 796 var connect = function () {
adamc@1260 797 xhr.onreadystatechange = orsc;
adamc@1260 798 tid = window.setTimeout(onTimeout, timeout * 500);
adamc@1260 799 requestUri(xhr, uri, false);
adamc@1260 800 }
adamc@673 801
adamc@1260 802 orsc = function() {
adamc@1260 803 if (xhr.readyState == 4) {
adamc@1260 804 window.clearTimeout(tid);
adamc@673 805
adamc@1260 806 var isok = false;
adamc@667 807
adamc@1260 808 try {
adamc@1260 809 if (xhr.status == 200)
adamc@1260 810 isok = true;
adamc@1260 811 } catch (e) { }
adamc@667 812
adamc@1260 813 if (isok) {
adamc@1260 814 var text = xhr.responseText
adamc@1260 815 if (text == "")
adamc@1260 816 return;
adamc@1260 817 var lines = text.split("\n");
adamc@889 818
adamc@1260 819 if (lines.length < 2) {
adamc@1260 820 discon();
adamc@1260 821 return;
adamc@1260 822 }
adamc@1260 823
adamc@1260 824 for (var i = 0; i+1 < lines.length; i += 2) {
adamc@1260 825 var chn = lines[i];
adamc@1260 826 var msg = lines[i+1];
adamc@1260 827
adamc@1260 828 if (chn < 0)
adamc@1260 829 whine("Out-of-bounds channel in message from remote server");
adamc@1260 830
adamc@1260 831 var ch;
adamc@1260 832
adamc@1260 833 if (chn >= channels.length || channels[chn] == null) {
adamc@1260 834 ch = newChannel();
adamc@1260 835 channels[chn] = ch;
adamc@1260 836 } else
adamc@1260 837 ch = channels[chn];
adamc@1260 838
adamc@1260 839 var listener = dequeue(ch.listeners);
adamc@1260 840 if (listener == null) {
adamc@1260 841 enqueue(ch.msgs, msg);
adamc@1260 842 } else {
adamc@1260 843 try {
adamc@1260 844 listener(msg);
adamc@1260 845 } catch (v) {
adamc@1260 846 doExn(v);
adamc@1260 847 }
adamc@1260 848 }
adamc@1260 849 }
adamc@1260 850
adamc@1260 851 xhrFinished(xhr);
adamc@1260 852
adamc@1260 853 connect();
adamc@1260 854 }
adamc@1260 855 else {
adamc@1260 856 try {
adamc@1260 857 if (xhr.status != 0)
adamc@1260 858 servErr("Error querying remote server for messages: " + xhr.status);
adamc@1260 859 } catch (e) { }
adamc@1260 860 }
adamc@729 861 }
adamc@1260 862 };
adamc@669 863
adamc@1260 864 onTimeout = function() {
adamc@1260 865 xhrFinished(xhr);
adamc@1260 866 connect();
adamc@1260 867 };
adamc@670 868
adamc@673 869 connect();
adamc@667 870 }
adamc@670 871
adamc@670 872 function rv(chn, parse, k) {
adamc@1260 873 if (chn == null)
adamc@1260 874 return;
adamc@682 875
adamc@1260 876 if (chn < 0)
adamc@1260 877 whine("Out-of-bounds channel receive");
adamc@670 878
adamc@1260 879 var ch;
adamc@670 880
adamc@1260 881 if (chn >= channels.length || channels[chn] == null) {
adamc@1260 882 ch = newChannel();
adamc@1260 883 channels[chn] = ch;
adamc@1260 884 } else
adamc@1260 885 ch = channels[chn];
adamc@670 886
adamc@1260 887 var msg = dequeue(ch.msgs);
adamc@1260 888 if (msg == null) {
adamc@1260 889 enqueue(ch.listeners, function(msg) { k(parse(msg)); });
adamc@1260 890 } else {
adamc@1260 891 try {
adamc@1260 892 k(parse(msg));
adamc@1260 893 } catch (v) {
adamc@1260 894 doExn(v);
adamc@1260 895 }
adamc@728 896 }
adamc@670 897 }
adamc@693 898
adamc@978 899 function sl(ms, k) {
adamc@1260 900 window.setTimeout(function() { k(null); }, ms);
adamc@1021 901 }
adamc@1021 902
adamc@1021 903 function sp(e) {
adamc@1260 904 execF(e, null);
adamc@978 905 }
adamc@978 906
adamc@693 907
adamc@895 908 // Key events
adamc@895 909
adamc@970 910 var uw_event = null;
adamc@970 911
adamc@970 912 function kc() {
adam@1290 913 return window.event ? event.keyCode : (uw_event ? uw_event.keyCode : 0);
adamc@970 914 }
adamc@970 915
adamc@970 916
adamc@970 917 // The Ur interpreter
adamc@970 918
adamc@970 919 var urfuncs = [];
adamc@970 920
adamc@970 921 function lookup(env, n) {
adamc@1260 922 while (env != null) {
adamc@1260 923 if (n == 0)
adamc@1260 924 return env.data;
adamc@1260 925 else {
adamc@1260 926 --n;
adamc@1260 927 env = env.next;
adamc@1260 928 }
adamc@970 929 }
adamc@970 930
adamc@1260 931 whine("Out-of-bounds Ur variable reference");
adamc@970 932 }
adamc@970 933
adamc@974 934 function execP(env, p, v) {
adamc@1260 935 switch (p.c) {
adamc@1260 936 case "w":
adamc@1260 937 return env;
adamc@1260 938 case "v":
adamc@1260 939 return cons(v, env);
adamc@1260 940 case "c":
adamc@1260 941 if (v == p.v)
adamc@1260 942 return env;
adamc@1260 943 else
adamc@1260 944 return false;
adamc@1260 945 case "s":
adamc@1260 946 if (v == null)
adamc@1260 947 return false;
adamc@1260 948 else
adamc@1260 949 return execP(env, p.p, p.n ? v.v : v);
adamc@1260 950 case "1":
adamc@1260 951 if (v.n != p.n)
adamc@1260 952 return false;
adamc@1260 953 else
adamc@1260 954 return execP(env, p.p, v.v);
adamc@1260 955 case "r":
adamc@1260 956 for (var fs = p.l; fs != null; fs = fs.next) {
adamc@1260 957 env = execP(env, fs.data.p, v["_" + fs.data.n]);
adamc@1260 958 if (env == false)
adamc@1260 959 return false;
adamc@1260 960 }
adamc@1260 961 return env;
adamc@1260 962 default:
adamc@1260 963 whine("Unknown Ur pattern kind" + p.c);
adamc@974 964 }
adamc@974 965 }
adamc@974 966
adamc@970 967 function exec0(env, e) {
adamc@1260 968 return exec1(env, null, e);
adamc@1020 969 }
adamc@1020 970
adamc@1020 971 function exec1(env, stack, e) {
adamc@1260 972 var stack, usedK = false;
adamc@970 973
adamc@1260 974 var saveEnv = function() {
adamc@1260 975 if (stack.next != null && stack.next.data.c != "<")
adamc@1260 976 stack = cons({c: "<", env: env}, stack.next);
adamc@1260 977 else
adamc@1260 978 stack = stack.next;
adamc@1260 979 };
adamc@983 980
adamc@1260 981 while (true) {
adamc@1260 982 switch (e.c) {
adamc@1260 983 case "c":
adamc@1260 984 var v = e.v;
adamc@1260 985 if (stack == null)
adamc@1260 986 return v;
adamc@1260 987 var fr = stack.data;
adamc@970 988
adamc@1260 989 switch (fr.c) {
adamc@1260 990 case "s":
adamc@1260 991 e = {c: "c", v: {v: v}};
adamc@1260 992 stack = stack.next;
adamc@1260 993 break;
adamc@1260 994 case "1":
adamc@1260 995 e = {c: "c", v: {n: fr.n, v: v}};
adamc@1260 996 stack = stack.next;
adamc@1260 997 break;
adamc@1260 998 case "f":
adamc@1260 999 fr.args[fr.pos++] = v;
adamc@1260 1000 if (fr.a == null) {
adamc@1260 1001 var res;
adamc@1260 1002 stack = stack.next;
adamc@1035 1003
adamc@1260 1004 if (fr.f.apply)
adamc@1260 1005 res = fr.f.apply(null, fr.args);
adamc@1260 1006 else if (fr.args.length == 0)
adamc@1260 1007 res = fr.f();
adamc@1260 1008 else if (fr.args.length == 1)
adamc@1260 1009 res = fr.f(fr.args[0]);
adamc@1260 1010 else if (fr.args.length == 2)
adamc@1260 1011 res = fr.f(fr.args[0], fr.args[1]);
adamc@1260 1012 else if (fr.args.length == 3)
adamc@1260 1013 res = fr.f(fr.args[0], fr.args[1], fr.args[2]);
adamc@1260 1014 else if (fr.args.length == 4)
adamc@1260 1015 res = fr.f(fr.args[0], fr.args[1], fr.args[2], fr.args[3]);
adamc@1260 1016 else if (fr.args.length == 5)
adamc@1260 1017 res = fr.f(fr.args[0], fr.args[1], fr.args[2], fr.args[3], fr.args[4]);
adamc@1260 1018 else
adamc@1260 1019 whine("Native function has " + fr.args.length + " args, but there is no special case for that count.");
adamc@1035 1020
adamc@1260 1021 e = {c: "c", v: res};
adamc@1260 1022 if (usedK) return null;
adamc@1260 1023 } else {
adamc@1260 1024 e = fr.a.data;
adamc@1260 1025 fr.a = fr.a.next;
adamc@1260 1026 }
adamc@1260 1027 break;
adamc@1260 1028 case "a1":
adamc@1260 1029 e = fr.x;
adamc@1260 1030 stack = cons({c: "a2", f: v}, stack.next);
adamc@1260 1031 break;
adamc@1260 1032 case "a2":
adamc@1260 1033 if (fr.f == null)
adamc@1260 1034 whine("Ur: applying null function");
adamc@1260 1035 else if (fr.f.body) {
adamc@1260 1036 saveEnv();
adamc@1260 1037 env = cons(v, fr.f.env);
adamc@1260 1038 e = fr.f.body;
adamc@1260 1039 } else {
adamc@1260 1040 e = {c: "c", v: fr.f(v)};
adamc@1260 1041 stack = stack.next;
adamc@1260 1042 }
adamc@1260 1043 break;
adamc@1260 1044 case "<":
adamc@1260 1045 env = fr.env;
adamc@1260 1046 stack = stack.next;
adamc@1260 1047 break;
adamc@1260 1048 case "r":
adamc@1260 1049 fr.fs["_" + fr.n] = v;
adamc@1260 1050 if (fr.l == null) {
adamc@1260 1051 e = {c: "c", v: fr.fs};
adamc@1260 1052 stack = stack.next;
adamc@1260 1053 } else {
adamc@1260 1054 fr.n = fr.l.data.n;
adamc@1260 1055 e = fr.l.data.v;
adamc@1260 1056 fr.l = fr.l.next;
adamc@1260 1057 }
adamc@1260 1058 break;
adamc@1260 1059 case ".":
adamc@1260 1060 e = {c: "c", v: v["_" + fr.f]};
adamc@1260 1061 stack = stack.next;
adamc@1260 1062 break;
adamc@1260 1063 case ";":
adamc@1260 1064 e = fr.e2;
adamc@1260 1065 stack = stack.next;
adamc@1260 1066 break;
adamc@1260 1067 case "=":
adamc@1260 1068 saveEnv();
adamc@1260 1069 env = cons(v, env);
adamc@1260 1070 e = fr.e2;
adamc@1260 1071 break;
adamc@1260 1072 case "m":
adamc@1260 1073 var ps;
adamc@1260 1074 for (ps = fr.p; ps != null; ps = ps.next) {
adamc@1260 1075 var r = execP(env, ps.data.p, v);
adamc@1260 1076 if (r != false) {
adamc@1260 1077 saveEnv();
adamc@1260 1078 env = r;
adamc@1260 1079 e = ps.data.b;
adamc@1260 1080 break;
adamc@1260 1081 }
adamc@1260 1082 }
adamc@1260 1083 if (ps == null)
adamc@1260 1084 whine("Match failure in Ur interpretation");
adamc@1260 1085 break;
adamc@1260 1086 default:
adamc@1260 1087 whine("Unknown Ur continuation kind " + fr.c);
adamc@1260 1088 }
adamc@1260 1089
adamc@1260 1090 break;
adamc@1260 1091 case "v":
adamc@1260 1092 e = {c: "c", v: lookup(env, e.n)};
adamc@1260 1093 break;
adamc@1260 1094 case "n":
adamc@1260 1095 var idx = e.n;
adamc@1260 1096 e = urfuncs[idx];
adamc@1260 1097 if (e.c == "t")
adamc@1262 1098 e = urfuncs[idx] = eval("(" + e.f + ")");
adamc@1260 1099 break;
adamc@1260 1100 case "s":
adamc@1260 1101 stack = cons({c: "s"}, stack);
adamc@1260 1102 e = e.v;
adamc@1260 1103 break;
adamc@1260 1104 case "1":
adamc@1260 1105 stack = cons({c: "1", n: e.n}, stack);
adamc@1260 1106 e = e.v;
adamc@1260 1107 break;
adamc@1260 1108 case "f":
adamc@1260 1109 if (e.a == null)
adamc@1260 1110 e = {c: "c", v: (eval(e.f))()};
adamc@1260 1111 else {
adamc@1260 1112 var args = [];
adamc@1260 1113 stack = cons({c: "f", f: eval(e.f), args: args, pos: 0, a: e.a.next}, stack);
adamc@1260 1114 if (!e.a.data.c) alert("[2] fr.f = " + e.f + "; 0 = " + e.a.data);
adamc@1260 1115 e = e.a.data;
adamc@1260 1116 }
adamc@1260 1117 break;
adamc@1260 1118 case "l":
adamc@1260 1119 e = {c: "c", v: {env: env, body: e.b}};
adamc@1260 1120 break;
adamc@1260 1121 case "a":
adamc@1260 1122 stack = cons({c: "a1", x: e.x}, stack);
adamc@1260 1123 e = e.f;
adamc@1260 1124 break;
adamc@1260 1125 case "r":
adamc@1260 1126 if (e.l == null)
adamc@1260 1127 whine("Empty Ur record in interpretation");
adamc@1260 1128 var fs = {};
adamc@1260 1129 stack = cons({c: "r", n: e.l.data.n, fs: fs, l: e.l.next}, stack);
adamc@1260 1130 e = e.l.data.v;
adamc@1260 1131 break;
adamc@1260 1132 case ".":
adamc@1260 1133 stack = cons({c: ".", f: e.f}, stack);
adamc@1260 1134 e = e.r;
adamc@1260 1135 break;
adamc@1260 1136 case ";":
adamc@1260 1137 stack = cons({c: ";", e2: e.e2}, stack);
adamc@1260 1138 e = e.e1;
adamc@1260 1139 break;
adamc@1260 1140 case "=":
adamc@1260 1141 stack = cons({c: "=", e2: e.e2}, stack);
adamc@1260 1142 e = e.e1;
adamc@1260 1143 break;
adamc@1260 1144 case "m":
adamc@1260 1145 stack = cons({c: "m", p: e.p}, stack);
adamc@1260 1146 e = e.e;
adamc@1260 1147 break;
adamc@1260 1148 case "e":
adamc@1260 1149 e = {c: "c", v: cs({c: "wc", env: env, body: e.e})};
adamc@1260 1150 break;
adamc@1260 1151 case "wc":
adamc@1260 1152 env = e.env;
adamc@1260 1153 e = e.body;
adamc@1260 1154 break;
adamc@1260 1155 case "K":
adamc@1260 1156 { var savedStack = stack.next, savedEnv = env;
adamc@1260 1157 e = {c: "c", v: function(v) { return exec1(savedEnv, savedStack, {c: "c", v: v}); } };}
adamc@1260 1158 usedK = true;
adamc@1260 1159 break;
adamc@1260 1160 default:
adamc@1260 1161 whine("Unknown Ur expression kind " + e.c);
adamc@970 1162 }
adamc@970 1163 }
adamc@970 1164 }
adamc@970 1165
adamc@976 1166 function execD(e) {
adamc@1260 1167 return exec0(null, e);
adamc@976 1168 }
adamc@976 1169
adamc@970 1170 function exec(e) {
adamc@1260 1171 var r = exec0(null, e);
adamc@970 1172
adamc@1260 1173 if (r != null && r.body != null)
adamc@1260 1174 return function(v) { return exec0(cons(v, r.env), r.body); };
adamc@1260 1175 else
adamc@1260 1176 return r;
adamc@895 1177 }
adamc@895 1178
adamc@977 1179 function execF(f, x) {
adamc@1260 1180 return exec0(cons(x, f.env), f.body);
adamc@977 1181 }
adamc@977 1182
adamc@895 1183
adam@1290 1184 // Wrappers
adam@1290 1185
adam@1290 1186 function confrm(s) {
adam@1290 1187 return confirm(s) ? true : false;
adam@1290 1188 }
adam@1290 1189
adam@1290 1190
adamc@1323 1191 // URL blessing
adamc@1323 1192
adamc@1323 1193 var urlRules = null;
adamc@1323 1194
adamc@1323 1195 function checkUrl(s) {
adamc@1323 1196 for (var r = urlRules; r; r = r.next) {
adamc@1323 1197 var ru = r.data;
adamc@1323 1198 if (ru.prefix ? s.indexOf(ru.pattern) == 0 : s == ru.pattern)
adamc@1323 1199 return ru.allow ? s : null;
adamc@1323 1200 }
adamc@1323 1201
adamc@1323 1202 return null;
adamc@1323 1203 }
adamc@1323 1204
adamc@1323 1205 function bless(s) {
adamc@1323 1206 u = checkUrl(s);
adamc@1323 1207 if (u == null)
adamc@1323 1208 er("Disallowed URL: " + s);
adamc@1323 1209 return u;
adamc@1323 1210 }
adamc@1323 1211
adamc@693 1212 // App-specific code
adamc@693 1213