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annotate lib/js/urweb.js @ 1643:b0720700c36e

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'dynClass' pseudo-attribute
author Adam Chlipala <adam@chlipala.net>
date Tue, 27 Dec 2011 16:20:48 -0500
parents 4682b312e9d5
children 1bfd793e7eb8
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@1619 22 function divInt(x, y) { if (y == 0) er("Division by zero"); var n = x / y; return n < 0 ? Math.ceil(n) : Math.floor(n); }
adamc@970 23 function mod(x, y) { return x % y; }
adam@1619 24 function modInt(x, y) { if (y == 0) er("Division by zero"); 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)
adam@1643 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@1571 96 // Floats
adam@1571 97
adam@1571 98 function float(n) {
adam@1571 99 return n;
adam@1571 100 }
adam@1571 101
adam@1571 102 function trunc(n) {
adam@1571 103 return ~~n;
adam@1571 104 }
adam@1571 105
adam@1571 106 function ceil(n) {
adam@1571 107 return Math.ceil(n);
adam@1571 108 }
adam@1571 109
adam@1571 110 function round(n) {
adam@1571 111 return Math.round(n);
adam@1571 112 }
adam@1571 113
adam@1571 114
adam@1599 115 // Time, represented as counts of microseconds since the epoch
adam@1487 116
adam@1629 117 var time_format = "%c";
adam@1629 118
adam@1487 119 function showTime(tm) {
adam@1629 120 return strftime(time_format, tm);
adam@1629 121 }
adam@1629 122
adam@1629 123 function showTimeHtml(tm) {
adam@1629 124 return eh(showTime(tm));
adam@1487 125 }
adam@1487 126
adam@1487 127 function now() {
adam@1487 128 return (new Date()).getTime() * 1000;
adam@1487 129 }
adam@1487 130
adam@1514 131 function diffInSeconds(tm1, tm2) {
adam@1514 132 return Math.round((tm2 - tm1) / 1000000);
adam@1514 133 }
adam@1514 134
adam@1514 135 function toSeconds(tm) {
adam@1514 136 return Math.round(tm / 1000000);
adam@1514 137 }
adam@1514 138
adam@1518 139 function addSeconds(tm, n) {
adam@1518 140 return tm + n * 1000000;
adam@1518 141 }
adam@1518 142
adam@1599 143 function stringToTime_error(string) {
adam@1599 144 var t = Date.parse(string);
adam@1599 145 if (isNaN(t))
adam@1632 146 er("Invalid date string: " + string);
adam@1599 147 else
adam@1599 148 return t * 1000;
adam@1599 149 }
adam@1599 150
adam@1599 151 function stringToTime(string) {
adam@1599 152 try {
adam@1599 153 var t = Date.parse(string);
adam@1599 154 if (isNaN(t))
adam@1599 155 return null;
adam@1599 156 else
adam@1599 157 return t * 1000;
adam@1599 158 } catch (e) {
adam@1599 159 return null;
adam@1599 160 }
rmbruijn@1597 161 }
rmbruijn@1597 162
adam@1609 163 /*
adam@1615 164 strftime() implementation from:
adam@1615 165 YUI 3.4.1 (build 4118)
adam@1615 166 Copyright 2011 Yahoo! Inc. All rights reserved.
adam@1615 167 Licensed under the BSD License.
adam@1615 168 http://yuilibrary.com/license/
adam@1615 169 */
adam@1609 170
adam@1615 171 var xPad=function (x, pad, r)
adam@1615 172 {
adam@1615 173 if(typeof r === "undefined")
adam@1615 174 {
adam@1615 175 r=10;
adam@1615 176 }
adam@1615 177 pad = pad.toString();
adam@1615 178 for( ; parseInt(x, 10)<r && r>1; r/=10) {
adam@1615 179 x = pad + x;
adam@1615 180 }
adam@1615 181 return x.toString();
adam@1615 182 };
adam@1609 183
adam@1615 184 var YDateEn = {
adam@1615 185 a: ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"],
adam@1615 186 A: ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"],
adam@1615 187 b: ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"],
adam@1615 188 B: ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"],
adam@1615 189 c: "%a %d %b %Y %T %Z",
adam@1615 190 p: ["AM", "PM"],
adam@1615 191 P: ["am", "pm"],
adam@1615 192 r: "%I:%M:%S %p",
adam@1615 193 x: "%d/%m/%y",
adam@1615 194 X: "%T"
adam@1615 195 };
adam@1609 196
adam@1615 197 var Dt = {
adam@1615 198 formats: {
adam@1615 199 a: function (d, l) { return l.a[d.getDay()]; },
adam@1615 200 A: function (d, l) { return l.A[d.getDay()]; },
adam@1615 201 b: function (d, l) { return l.b[d.getMonth()]; },
adam@1615 202 B: function (d, l) { return l.B[d.getMonth()]; },
adam@1615 203 C: function (d) { return xPad(parseInt(d.getFullYear()/100, 10), 0); },
adam@1615 204 d: ["getDate", "0"],
adam@1615 205 e: ["getDate", " "],
adam@1615 206 g: function (d) { return xPad(parseInt(Dt.formats.G(d)%100, 10), 0); },
adam@1615 207 G: function (d) {
adam@1615 208 var y = d.getFullYear();
adam@1615 209 var V = parseInt(Dt.formats.V(d), 10);
adam@1615 210 var W = parseInt(Dt.formats.W(d), 10);
adam@1615 211
adam@1615 212 if(W > V) {
adam@1615 213 y++;
adam@1615 214 } else if(W===0 && V>=52) {
adam@1615 215 y--;
adam@1615 216 }
adam@1615 217
adam@1615 218 return y;
adam@1615 219 },
adam@1615 220 H: ["getHours", "0"],
adam@1615 221 I: function (d) { var I=d.getHours()%12; return xPad(I===0?12:I, 0); },
adam@1615 222 j: function (d) {
adam@1615 223 var gmd_1 = new Date("" + d.getFullYear() + "/1/1 GMT");
adam@1615 224 var gmdate = new Date("" + d.getFullYear() + "/" + (d.getMonth()+1) + "/" + d.getDate() + " GMT");
adam@1615 225 var ms = gmdate - gmd_1;
adam@1615 226 var doy = parseInt(ms/60000/60/24, 10)+1;
adam@1615 227 return xPad(doy, 0, 100);
adam@1615 228 },
adam@1615 229 k: ["getHours", " "],
adam@1615 230 l: function (d) { var I=d.getHours()%12; return xPad(I===0?12:I, " "); },
adam@1615 231 m: function (d) { return xPad(d.getMonth()+1, 0); },
adam@1615 232 M: ["getMinutes", "0"],
adam@1615 233 p: function (d, l) { return l.p[d.getHours() >= 12 ? 1 : 0 ]; },
adam@1615 234 P: function (d, l) { return l.P[d.getHours() >= 12 ? 1 : 0 ]; },
adam@1615 235 s: function (d, l) { return parseInt(d.getTime()/1000, 10); },
adam@1615 236 S: ["getSeconds", "0"],
adam@1615 237 u: function (d) { var dow = d.getDay(); return dow===0?7:dow; },
adam@1615 238 U: function (d) {
adam@1615 239 var doy = parseInt(Dt.formats.j(d), 10);
adam@1615 240 var rdow = 6-d.getDay();
adam@1615 241 var woy = parseInt((doy+rdow)/7, 10);
adam@1615 242 return xPad(woy, 0);
adam@1615 243 },
adam@1615 244 V: function (d) {
adam@1615 245 var woy = parseInt(Dt.formats.W(d), 10);
adam@1615 246 var dow1_1 = (new Date("" + d.getFullYear() + "/1/1")).getDay();
adam@1615 247 var idow = woy + (dow1_1 > 4 || dow1_1 <= 1 ? 0 : 1);
adam@1615 248 if(idow === 53 && (new Date("" + d.getFullYear() + "/12/31")).getDay() < 4)
adam@1615 249 {
adam@1615 250 idow = 1;
adam@1615 251 }
adam@1615 252 else if(idow === 0)
adam@1615 253 {
adam@1615 254 idow = Dt.formats.V(new Date("" + (d.getFullYear()-1) + "/12/31"));
adam@1615 255 }
adam@1615 256
adam@1615 257 return xPad(idow, 0);
adam@1615 258 },
adam@1615 259 w: "getDay",
adam@1615 260 W: function (d) {
adam@1615 261 var doy = parseInt(Dt.formats.j(d), 10);
adam@1615 262 var rdow = 7-Dt.formats.u(d);
adam@1615 263 var woy = parseInt((doy+rdow)/7, 10);
adam@1615 264 return xPad(woy, 0, 10);
adam@1615 265 },
adam@1615 266 y: function (d) { return xPad(d.getFullYear()%100, 0); },
adam@1615 267 Y: "getFullYear",
adam@1615 268 z: function (d) {
adam@1615 269 var o = d.getTimezoneOffset();
adam@1615 270 var H = xPad(parseInt(Math.abs(o/60), 10), 0);
adam@1615 271 var M = xPad(Math.abs(o%60), 0);
adam@1615 272 return (o>0?"-":"+") + H + M;
adam@1615 273 },
adam@1615 274 Z: function (d) {
adam@1615 275 var tz = d.toString().replace(/^.*:\d\d( GMT[+-]\d+)? \(?([A-Za-z ]+)\)?\d*$/, "$2").replace(/[a-z ]/g, "");
adam@1615 276 if(tz.length > 4) {
adam@1615 277 tz = Dt.formats.z(d);
adam@1615 278 }
adam@1615 279 return tz;
adam@1615 280 },
adam@1615 281 "%": function (d) { return "%"; }
adam@1615 282 },
adam@1615 283
adam@1615 284 aggregates: {
adam@1615 285 c: "locale",
adam@1615 286 D: "%m/%d/%y",
adam@1615 287 F: "%Y-%m-%d",
adam@1615 288 h: "%b",
adam@1615 289 n: "\n",
adam@1615 290 r: "%I:%M:%S %p",
adam@1615 291 R: "%H:%M",
adam@1615 292 t: "\t",
adam@1615 293 T: "%H:%M:%S",
adam@1615 294 x: "locale",
adam@1615 295 X: "locale"
adam@1615 296 },
adam@1615 297
adam@1615 298 format : function (oDate, format) {
adam@1615 299 var replace_aggs = function (m0, m1) {
adam@1615 300 var f = Dt.aggregates[m1];
adam@1615 301 return (f === "locale" ? YDateEn[m1] : f);
adam@1615 302 };
adam@1615 303
adam@1615 304 var replace_formats = function (m0, m1) {
adam@1615 305 var f = Dt.formats[m1];
adam@1615 306 switch(typeof f) {
adam@1615 307 case "string":
adam@1615 308 return oDate[f]();
adam@1615 309 case "function":
adam@1615 310 return f.call(oDate, oDate, YDateEn);
adam@1615 311 case "array":
adam@1615 312 case "object":
adam@1615 313 if(typeof(f[0]) === "string")
adam@1615 314 return xPad(oDate[f[0]](), f[1]);
adam@1615 315 default:
adam@1615 316 return m1;
adam@1615 317 }
adam@1615 318 };
adam@1615 319
adam@1615 320 while(format.match(/%[cDFhnrRtTxX]/)) {
adam@1615 321 format = format.replace(/%([cDFhnrRtTxX])/g, replace_aggs);
adam@1609 322 }
adam@1615 323
adam@1615 324 var str = format.replace(/%([aAbBCdegGHIjklmMpPsSuUVwWyYzZ%])/g, replace_formats);
adam@1615 325
adam@1615 326 replace_aggs = replace_formats = undefined;
adam@1615 327
adam@1615 328 return str;
adam@1615 329 }
adam@1609 330 };
adam@1609 331
adam@1615 332 // End of YUI code
adam@1609 333
adam@1609 334 function strftime(fmt, thisTime)
adam@1609 335 {
adam@1609 336 var thisDate = new Date();
adam@1622 337 thisDate.setTime(Math.floor(thisTime / 1000));
adam@1615 338 return Dt.format(thisDate, fmt);
adam@1622 339 };
adam@1609 340
adam@1487 341
adamc@729 342 // Error handling
adamc@729 343
adam@1625 344 function uw_debug(msg) {
adam@1625 345 try {
adam@1625 346 console.debug(msg);
adam@1625 347 } catch (e) {
adam@1625 348 alert("DEBUG: " + msg);
adam@1625 349 }
adam@1625 350
adam@1625 351 return 0;
adam@1625 352 }
adam@1625 353
adamc@729 354 function whine(msg) {
adamc@1260 355 alert(msg);
adamc@1260 356 throw msg;
adamc@729 357 }
adamc@729 358
adamc@810 359 function pf(loc) {
adamc@1260 360 throw ("Pattern match failure (" + loc + ")");
adamc@729 361 }
adamc@729 362
adam@1553 363 var lameDuck = false;
adam@1553 364
adamc@798 365 function runHandlers(kind, ls, arg) {
adam@1553 366 if (!lameDuck) {
adam@1553 367 if (ls == null)
adam@1553 368 alert(kind + ": " + arg);
adam@1553 369 for (; ls; ls = ls.next)
adam@1553 370 try {
adam@1553 371 exec({c:"a", f:{c:"a", f:ls.data, x:{c:"c", v:arg}}, x:{c:"c", v:null}});
adam@1553 372 } catch (v) { }
adam@1553 373 }
adamc@729 374 }
adamc@729 375
adamc@729 376 var errorHandlers = null;
adamc@729 377
adamc@729 378 function onError(f) {
adamc@1260 379 errorHandlers = cons(f, errorHandlers);
adamc@729 380 }
adamc@729 381
adamc@729 382 function er(s) {
adamc@1260 383 runHandlers("Error", errorHandlers, s);
adamc@1260 384 throw {uw_error: s};
adamc@729 385 }
adamc@729 386
adamc@729 387 var failHandlers = null;
adamc@729 388
adamc@729 389 function onFail(f) {
adamc@1260 390 failHandlers = cons(f, failHandlers);
adamc@729 391 }
adamc@729 392
adamc@729 393 function doExn(v) {
adamc@1260 394 if (v == null || v.uw_error == null) {
adamc@1260 395 var s = (v == null ? "null" : v.message ? v.message : v.toString());
adamc@1260 396 if (v != null && v.fileName && v.lineNumber)
adamc@1260 397 s += " (" + v.fileName + ":" + v.lineNumber + ")";
adamc@1260 398 runHandlers("Fail", failHandlers, s);
adamc@1260 399 }
adamc@729 400 }
adamc@729 401
adamc@729 402 var disconnectHandlers = null;
adamc@729 403
adamc@976 404 function flift(f) {
kkallio@1484 405 return {c: "c", v:{env:cons(f,null), body:{c:"v", n:1}}};
adamc@976 406 }
adamc@976 407
adamc@729 408 function onDisconnect(f) {
adamc@1260 409 disconnectHandlers = cons(flift(f), disconnectHandlers);
adamc@729 410 }
adamc@729 411
adamc@729 412 function discon() {
adamc@1260 413 runHandlers("Disconnect", disconnectHandlers, null);
adamc@729 414 }
adamc@729 415
adamc@729 416 var connectHandlers = null;
adamc@729 417
adamc@729 418 function onConnectFail(f) {
adamc@1260 419 connectHandlers = cons(flift(f), connectHandlers);
adamc@729 420 }
adamc@729 421
adamc@729 422 function conn() {
adamc@1260 423 runHandlers("Connect", connectHandlers, null);
adamc@729 424 }
adamc@729 425
adamc@729 426 var serverHandlers = null;
adamc@729 427
adamc@729 428 function onServerError(f) {
adamc@1260 429 serverHandlers = cons(f, serverHandlers);
adamc@729 430 }
adamc@729 431
adamc@729 432 function servErr(s) {
adamc@1260 433 window.setTimeout(function () { runHandlers("Server", serverHandlers, s); }, 0);
adamc@729 434 }
adamc@729 435
adam@1555 436 // Key events
adam@1555 437
adam@1555 438 var uw_event = null;
adam@1555 439
adam@1555 440 function kc() {
adam@1555 441 return window.event ? event.keyCode : (uw_event ? uw_event.which : 0);
adam@1555 442 }
adam@1555 443
adam@1555 444 // Document events
adam@1555 445
adam@1555 446 function uw_handler(name, f) {
adam@1555 447 var old = document[name];
adam@1555 448 if (old == undefined)
adam@1559 449 document[name] = function(event) { uw_event = event; execF(f); };
adam@1555 450 else
adam@1559 451 document[name] = function(event) { uw_event = event; old(); execF(f); };
adam@1555 452 }
adam@1555 453
adam@1555 454 function uw_onClick(f) {
adam@1555 455 uw_handler("onclick", f);
adam@1555 456 }
adam@1555 457
adam@1555 458 function uw_onDblclick(f) {
adam@1555 459 uw_handler("ondblclick", f);
adam@1555 460 }
adam@1555 461
adam@1555 462 function uw_onMousedown(f) {
adam@1555 463 uw_handler("onmousedown", f);
adam@1555 464 }
adam@1555 465
adam@1555 466 function uw_onMouseup(f) {
adam@1555 467 uw_handler("onmouseup", f);
adam@1555 468 }
adam@1555 469
adam@1555 470 function uw_keyHandler(name, f) {
adam@1555 471 var old = document[name];
adam@1555 472 if (old == undefined)
adam@1559 473 document[name] = function(event) { uw_event = event; execF(execF(f, kc())); };
adam@1555 474 else
adam@1559 475 document[name] = function(event) { uw_event = event; old(); execF(execF(f, kc())); };
adam@1555 476 }
adam@1555 477
adam@1555 478 function uw_onKeydown(f) {
adam@1555 479 uw_keyHandler("onkeydown", f);
adam@1555 480 }
adam@1555 481
adam@1555 482 function uw_onKeypress(f) {
adam@1555 483 uw_keyHandler("onkeypress", f);
adam@1555 484 }
adam@1555 485
adam@1555 486 function uw_onKeyup(f) {
adam@1555 487 uw_keyHandler("onkeyup", f);
adam@1555 488 }
adam@1555 489
adam@1559 490 // Cancelling of further event processing
adam@1559 491
adam@1559 492 function uw_preventDefault() {
adam@1559 493 var e = window.event ? window.event : uw_event;
adam@1559 494 e.returnValue = false;
adam@1559 495 if (e.preventDefault) e.preventDefault();
adam@1559 496 }
adam@1559 497
adam@1559 498 function uw_stopPropagation() {
adam@1559 499 var e = window.event ? window.event : uw_event;
adam@1559 500 e.cancelBubble = true;
adam@1559 501 if (e.stopPropagation) e.stopPropagation();
adam@1559 502 }
adamc@729 503
adamc@692 504 // Embedding closures in XML strings
adamc@692 505
adamc@693 506 function cs(f) {
adamc@1260 507 return {closure: f};
adamc@693 508 }
adamc@693 509
adamc@693 510 function isWeird(v) {
adamc@1260 511 return v.closure != null || v.cat1 != null;
adamc@693 512 }
adamc@693 513
adamc@692 514 function cat(s1, s2) {
adamc@1260 515 if (isWeird(s1) || isWeird(s2))
adamc@1260 516 return {cat1: s1, cat2: s2};
adamc@1260 517 else
adamc@1260 518 return s1 + s2;
adamc@692 519 }
adamc@692 520
adamc@692 521 var closures = [];
adamc@703 522 var freeClosures = null;
adamc@692 523
adamc@692 524 function newClosure(f) {
adamc@1260 525 var n;
adamc@1260 526 if (freeClosures == null) {
adamc@1260 527 n = closures.length;
adamc@1260 528 } else {
adamc@1260 529 n = freeClosures.data;
adamc@1260 530 freeClosures = freeClosures.next;
adamc@1260 531 }
adamc@1260 532 closures[n] = f;
adamc@1260 533 return n;
adamc@692 534 }
adamc@692 535
adamc@703 536 function freeClosure(n) {
adamc@1260 537 closures[n] = null;
adamc@1260 538 freeClosures = cons(n, freeClosures);
adamc@703 539 }
adamc@703 540
adamc@692 541 function cr(n) {
adamc@1260 542 return closures[n];
adamc@692 543 }
adamc@692 544
adamc@703 545 function flatten(cls, tr) {
adamc@1260 546 if (tr.cat1 != null)
adamc@1260 547 return flatten(cls, tr.cat1) + flatten(cls, tr.cat2);
adamc@1260 548 else if (tr.closure != null) {
adamc@1260 549 var cl = newClosure(tr.closure);
adamc@1260 550 cls.v = cons(cl, cls.v);
adamc@1260 551 return "cr(" + cl + ")";
adamc@1260 552 } else
adamc@1260 553 return tr;
adamc@692 554 }
adamc@692 555
adamc@728 556 function flattenLocal(s) {
adamc@1260 557 var cls = {v : null};
adamc@1260 558 var r = flatten(cls, s);
adamc@1260 559 for (cl = cls.v; cl != null; cl = cl.next)
adamc@1260 560 freeClosure(cl.data);
adamc@1260 561 return r;
adamc@728 562 }
adamc@728 563
adamc@692 564
adamc@692 565 // Dynamic tree management
adamc@692 566
adamc@690 567 function populate(node) {
adamc@1260 568 var s = node.signal;
adamc@1260 569 var oldSources = node.sources;
adamc@1260 570 try {
adamc@1260 571 var sr = execF(s, null);
adamc@1260 572 var newSources = sr._sources;
adamc@690 573
adamc@1260 574 for (var sp = oldSources; sp; sp = sp.next)
adamc@1260 575 if (!member(sp.data, newSources))
adamc@1260 576 sp.data.dyns = remove(node, sp.data.dyns);
adamc@690 577
adamc@1260 578 for (var sp = newSources; sp; sp = sp.next)
adamc@1260 579 if (!member(sp.data, oldSources))
adamc@1260 580 sp.data.dyns = cons(node, sp.data.dyns);
adamc@690 581
adamc@1260 582 node.sources = newSources;
adamc@1260 583 node.recreate(sr._data);
adamc@1260 584 } catch (v) {
adamc@1260 585 doExn(v);
adamc@1260 586 }
adamc@579 587 }
adamc@574 588
adamc@580 589 function sc(v) {
adamc@1260 590 return {data : v, dyns : null};
adamc@580 591 }
adamc@580 592 function sv(s, v) {
adam@1491 593 if (s.data != v) {
adam@1491 594 s.data = v;
adamc@967 595
adam@1491 596 for (var ls = s.dyns; ls; ls = ls.next)
adam@1491 597 if (!ls.dead)
adam@1491 598 populate(ls.data);
adam@1491 599 }
adamc@580 600 }
adamc@601 601 function sg(s) {
adamc@1260 602 return s.data;
adamc@601 603 }
adamc@579 604
adamc@580 605 function ss(s) {
adamc@1260 606 return {env:cons(s, null), body:{c:"r", l:
adamc@1260 607 cons({n:"sources", v:{c:"c", v:cons(s, null)}},
adamc@1260 608 cons({n:"data", v:{c:"f", f:sg, a:cons({c:"v", n:1}, null)}}, null))}};
adamc@580 609 }
adamc@580 610 function sr(v) {
adamc@1260 611 return {env:null, body:{c:"c", v:{_sources : null, _data : v}}};
adamc@580 612 }
adamc@580 613 function sb(x,y) {
adamc@1260 614 return {env:cons(y,cons(x,null)),
adamc@1260 615 body:{c:"=",
adamc@1260 616 e1:{c:"a", f:{c:"v", n:2}, x:{c:"c", v:null}},
adamc@1260 617 e2:{c:"=",
adamc@1260 618 e1:{c:"a",
adamc@1260 619 f:{c:"a", f:{c:"v", n:2}, x:{c:".", r:{c:"v", n:0}, f:"data"}},
adamc@1260 620 x:{c:"c", v:null}},
adamc@1260 621 e2:{c:"r", l:cons(
adamc@1260 622 {n:"sources", v:{c:"f", f:union, a:cons({c:".", r:{c:"v", n:1}, f:"sources"},
adamc@1260 623 cons({c:".", r:{c:"v", n:0}, f:"sources"}, null))}},
adamc@1260 624 cons({n:"data", v:{c:".", r:{c:"v", n:0}, f:"data"}}, null))}}}};
adamc@580 625 }
adamc@841 626 function scur(s) {
adamc@1260 627 return execF(s, null)._data;
adamc@841 628 }
adamc@571 629
adamc@604 630 function lastParent() {
adamc@1260 631 var pos = document.body;
adamc@604 632
adamc@1260 633 while (pos.lastChild && pos.lastChild.nodeType == 1)
adamc@1260 634 pos = pos.lastChild;
adamc@600 635
adamc@1260 636 pos = pos.parentNode;
adamc@1039 637
adamc@1260 638 return pos;
adamc@600 639 }
adamc@600 640
adamc@898 641 function parent() {
adamc@1260 642 return thisScript ? thisScript.parentNode : lastParent();
adamc@898 643 }
adamc@898 644
adamc@604 645 function addNode(node) {
adamc@1260 646 if (thisScript)
adamc@1260 647 thisScript.parentNode.replaceChild(node, thisScript);
adamc@1260 648 else
adamc@1260 649 lastParent().appendChild(node);
adamc@603 650 }
adamc@603 651
adamc@690 652 var thisScript = null;
adamc@690 653
adamc@604 654 function runScripts(node) {
adamc@1260 655 if (node.getElementsByTagName) {
adamc@1260 656 var savedScript = thisScript;
adamc@603 657
adamc@1260 658 var scripts = node.getElementsByTagName("script"), scriptsCopy = [];
adamc@1260 659 var len = scripts.length;
adamc@1260 660 for (var i = 0; i < len; ++i)
adamc@1260 661 scriptsCopy[i] = scripts[i];
adamc@1260 662 for (var i = 0; i < len; ++i) {
adamc@1260 663 thisScript = scriptsCopy[i];
adamc@1039 664
adamc@1260 665 try {
adamc@1260 666 eval(thisScript.text);
adamc@1260 667 } catch (v) {
adamc@1260 668 doExn(v);
adamc@1260 669 }
adamc@1260 670 if (thisScript.parentNode)
adamc@1260 671 thisScript.parentNode.removeChild(thisScript);
adamc@1260 672 }
adamc@1260 673
adamc@1260 674 thisScript = savedScript;
adamc@729 675 }
adamc@603 676 }
adamc@603 677
adamc@603 678
adamc@692 679 // Dynamic tree entry points
adamc@692 680
adamc@967 681 function killScript(scr) {
adamc@1260 682 scr.dead = true;
adamc@1260 683 for (var ls = scr.sources; ls; ls = ls.next)
adamc@1260 684 ls.data.dyns = remove(scr, ls.data.dyns);
adamc@1260 685 for (var ls = scr.closures; ls; ls = ls.next)
adamc@1260 686 freeClosure(ls.data);
adamc@967 687 }
adamc@967 688
adam@1538 689 // Sometimes we wind up with tables that contain <script>s outside the single <tbody>.
adam@1538 690 // To avoid dealing with that case, we normalize by moving <script>s into <tbody>.
adam@1538 691 function normalizeTable(table) {
adam@1538 692 var orig = table;
adam@1538 693
adam@1538 694 var script, next;
adam@1538 695
adam@1538 696 while (table.tagName != "TABLE")
adam@1538 697 table = table.parentNode;
adam@1538 698
adam@1538 699 for (var tbody = table.firstChild; tbody; tbody = tbody.nextSibling) {
adam@1538 700 if (tbody.tagName == "TBODY") {
adam@1538 701 for (script = table.firstChild; script && script != tbody; script = next) {
adam@1538 702 next = script.nextSibling;
adam@1538 703
adam@1538 704 tbody.insertBefore(script, tbody.firstChild);
adam@1538 705 }
adam@1538 706
adam@1538 707 return;
adam@1538 708 }
adam@1538 709 }
adam@1538 710
adam@1538 711 var tbody = document.createElement("tbody");
adam@1538 712 for (script = table.firstChild; script; script = next) {
adam@1538 713 next = script.nextSibling;
rmbruijn@1597 714
adam@1538 715 tbody.insertBefore(script, tbody.firstChild);
adam@1538 716 }
adam@1538 717 table.appendChild(tbody);
adam@1538 718 }
adam@1538 719
adamc@901 720 function dyn(pnode, s) {
adamc@1260 721 var x = document.createElement("script");
adamc@1260 722 x.dead = false;
adamc@1260 723 x.signal = s;
adamc@1260 724 x.sources = null;
adamc@1260 725 x.closures = null;
adamc@899 726
adamc@1260 727 var firstChild = null;
adamc@899 728
adamc@1260 729 x.recreate = function(v) {
adamc@1260 730 for (var ls = x.closures; ls; ls = ls.next)
adamc@1260 731 freeClosure(ls.data);
adamc@945 732
adamc@946 733 var next;
adamc@1260 734 for (var child = firstChild; child && child != x; child = next) {
adamc@1260 735 next = child.nextSibling;
adamc@1260 736
adamc@1260 737 killScript(child);
adamc@1260 738 if (child.getElementsByTagName) {
adamc@1260 739 var arr = child.getElementsByTagName("script");
adamc@1260 740 for (var i = 0; i < arr.length; ++i)
adamc@1260 741 killScript(arr[i]);
adamc@1260 742 }
adamc@1260 743
adamc@1260 744 if (child.parentNode)
adamc@1260 745 child.parentNode.removeChild(child);
adamc@946 746 }
adamc@903 747
adamc@1260 748 var cls = {v : null};
adamc@1260 749 var html = flatten(cls, v);
adamc@1260 750 if (pnode != "table" && pnode != "tr")
adamc@1260 751 html = dynPrefix + html;
adamc@1260 752 x.closures = cls.v;
adamc@946 753
adamc@1260 754 if (pnode == "table") {
adam@1538 755 normalizeTable(x.parentNode);
adam@1538 756
adamc@1260 757 var dummy = document.createElement("body");
adamc@1260 758 dummy.innerHTML = "<table>" + html + "</table>";
adamc@1260 759 runScripts(dummy);
adamc@1260 760 var table = x.parentNode;
adamc@1260 761
adamc@1260 762 if (table) {
adamc@1260 763 firstChild = null;
adamc@1260 764 var tbody;
adamc@1260 765
adamc@1260 766 var arr = dummy.getElementsByTagName("tbody");
adamc@1260 767
adamc@1260 768 var tbody;
adamc@1260 769 if (arr.length > 0 && arr[0].parentNode == dummy.firstChild) {
adamc@1260 770 tbody = arr[0];
adamc@1260 771 var next;
adamc@1260 772 for (var node = dummy.firstChild.firstChild; node; node = next) {
adamc@1260 773 next = node.nextSibling;
adamc@1260 774
adamc@1260 775 if (node.tagName != "TBODY")
adamc@1260 776 tbody.appendChild(node);
adamc@1260 777 }
adamc@1260 778 } else
adamc@1260 779 tbody = dummy.firstChild;
adamc@1260 780
adamc@1260 781 var next;
adamc@1260 782 firstChild = document.createElement("script");
adamc@1260 783 table.insertBefore(firstChild, x);
adamc@1260 784 for (var node = tbody.firstChild; node; node = next) {
adamc@1260 785 next = node.nextSibling;
adamc@1260 786 table.insertBefore(node, x);
adamc@1260 787 }
adamc@1260 788 }
adamc@1260 789 } else if (pnode == "tr") {
adamc@1260 790 var dummy = document.createElement("body");
adamc@1260 791 dummy.innerHTML = "<table><tr>" + html + "</tr></table>";
adamc@1260 792 runScripts(dummy);
adamc@1260 793 var table = x.parentNode;
adamc@1260 794
adamc@1260 795 if (table) {
adamc@1260 796 var arr = dummy.getElementsByTagName("tr");
adamc@1260 797 firstChild = null;
adamc@1260 798 var tr;
adamc@1260 799 if (arr.length > 0 && table != null)
adamc@1260 800 tr = arr[0];
adamc@1260 801 else
adamc@1260 802 tr = dummy.firstChild;
adamc@1260 803
adamc@1260 804 var next;
adamc@1260 805 firstChild = document.createElement("script");
adamc@1260 806 table.insertBefore(firstChild, x);
adamc@1260 807 for (var node = tr.firstChild; node; node = next) {
adamc@1260 808 next = node.nextSibling;
adamc@1260 809 table.insertBefore(node, x);
adamc@1260 810 }
adamc@1260 811 }
adamc@1260 812 } else {
adamc@1260 813 firstChild = document.createElement("span");
adamc@1260 814 firstChild.innerHTML = html;
adamc@1260 815 runScripts(firstChild);
adamc@1260 816 if (x.parentNode)
adamc@1260 817 x.parentNode.insertBefore(firstChild, x);
adamc@903 818 }
adamc@1260 819 };
adamc@899 820
adamc@1260 821 addNode(x);
adamc@1260 822 populate(x);
adamc@571 823 }
adamc@582 824
adam@1463 825 function input(x, s, recreate, type, name) {
adam@1463 826 if (name) x.name = name;
adamc@1260 827 if (type) x.type = type;
adamc@1260 828 x.dead = false;
adamc@1260 829 x.signal = ss(s);
adamc@1260 830 x.sources = null;
adamc@1260 831 x.recreate = recreate(x);
adamc@1260 832 addNode(x);
adamc@1260 833 populate(x);
adamc@816 834
adamc@1260 835 return x;
adamc@816 836 }
adamc@816 837
adam@1463 838 function inp(s, name) {
adamc@1260 839 var x = input(document.createElement("input"), s,
adam@1463 840 function(x) { return function(v) { if (x.value != v) x.value = v; }; }, null, name);
adamc@1260 841 x.value = s.data;
adam@1491 842 x.onkeyup = x.oninput = x.onchange = x.onpropertychange = function() { sv(s, x.value) };
adamc@816 843
adamc@1260 844 return x;
adamc@816 845 }
adamc@816 846
adam@1479 847 function selectValue(x) {
adam@1479 848 if (x.options.length == 0)
adam@1479 849 return "";
adam@1479 850 else
adam@1479 851 return x.options[x.selectedIndex].value;
adam@1479 852 }
adam@1479 853
adam@1479 854 function setSelectValue(x, v) {
adam@1479 855 for (var i = 0; i < x.options.length; ++i) {
adam@1479 856 if(x.options[i].value == v) {
adam@1479 857 x.selectedIndex = i;
adam@1479 858 return;
adam@1479 859 }
adam@1479 860 }
adam@1479 861 }
adam@1479 862
adamc@816 863 function sel(s, content) {
adamc@1260 864 var dummy = document.createElement("span");
adamc@1260 865 dummy.innerHTML = "<select>" + content + "</select>";
adam@1479 866 var x = input(dummy.firstChild, s, function(x) { return function(v) { if (selectValue(x) != v) setSelectValue(x, v); }; });
adam@1479 867
adam@1479 868 for (var i = 0; i < x.options.length; ++i) {
adam@1479 869 if (x.options[i].value == "")
adam@1479 870 x.options[i].value = x.options[i].text;
adam@1479 871 else
adam@1479 872 x.options[i].value = x.options[i].value.substring(1);
adam@1479 873 }
adam@1479 874
adam@1479 875 setSelectValue(x, s.data);
adam@1479 876 if (selectValue(x) != s.data)
adam@1479 877 sv(s, selectValue(x));
adam@1479 878 x.onchange = function() { sv(s, selectValue(x)) };
adamc@797 879
adamc@1260 880 return x;
adamc@598 881 }
adamc@598 882
adamc@817 883 function chk(s) {
adamc@1260 884 var x = input(document.createElement("input"), s,
adamc@1260 885 function(x) { return function(v) { if (x.checked != v) x.checked = v; }; }, "checkbox");
adamc@1260 886 x.defaultChecked = x.checked = s.data;
adam@1610 887 x.onclick = x.onkeyup = x.oninput = x.onchange = x.onpropertychange = function() { sv(s, x.checked) };
adamc@817 888
adamc@1260 889 return x;
adamc@817 890 }
adamc@817 891
adamc@1099 892 function tbx(s) {
adamc@1260 893 var x = input(document.createElement("textarea"), s,
adamc@1260 894 function(x) { return function(v) { if (x.innerHTML != v) x.innerHTML = v; }; });
adamc@1260 895 x.innerHTML = s.data;
adam@1491 896 x.onkeyup = x.oninput = x.onchange = x.onpropertychange = function() { sv(s, x.value) };
adamc@1099 897
adamc@1260 898 return x;
adamc@1099 899 }
adamc@1099 900
adam@1643 901 function dynClass(html, s) {
adam@1643 902 var htmlCls = {v : null};
adam@1643 903 html = flatten(htmlCls, html);
adam@1643 904 htmlCls = htmlCls.v;
adam@1643 905
adam@1643 906 var dummy = document.createElement("body");
adam@1643 907 dummy.innerHTML = html;
adam@1643 908 runScripts(dummy);
adam@1643 909 var html = dummy.firstChild;
adam@1643 910 dummy.removeChild(html);
adam@1643 911 addNode(html);
adam@1643 912
adam@1643 913 var x = document.createElement("script");
adam@1643 914 x.dead = false;
adam@1643 915 x.signal = s;
adam@1643 916 x.sources = null;
adam@1643 917 x.closures = htmlCls;
adam@1643 918
adam@1643 919 x.recreate = function(v) {
adam@1643 920 for (var ls = x.closures; ls != htmlCls; ls = ls.next)
adam@1643 921 freeClosure(ls.data);
adam@1643 922
adam@1643 923 var cls = {v : null};
adam@1643 924 html.className = flatten(cls, v);
adam@1643 925 x.closures = concat(cls.v, htmlCls);
adam@1643 926 };
adam@1643 927
adam@1643 928 addNode(x);
adam@1643 929 populate(x);
adam@1643 930 }
adam@1643 931
adamc@800 932 function addOnChange(x, f) {
adamc@1260 933 var old = x.onchange;
adam@1290 934 if (old == null)
adam@1290 935 x.onchange = f;
adam@1290 936 else
adam@1290 937 x.onchange = function() { old(); f(); };
adam@1290 938 }
adam@1290 939
adam@1290 940 function addOnKeyUp(x, f) {
adam@1290 941 var old = x.onkeyup;
adam@1290 942 if (old == null)
adam@1290 943 x.onkeyup = f;
adam@1290 944 else
adam@1290 945 x.onkeyup = function(x) { old(x); f(x); };
adamc@800 946 }
adamc@800 947
adamc@692 948
adamc@692 949 // Basic string operations
adamc@692 950
adamc@597 951 function eh(x) {
adamc@1260 952 if (x == null)
adamc@1260 953 return "NULL";
adamc@1260 954 else
adamc@1260 955 return x.split("&").join("&amp;").split("<").join("&lt;").split(">").join("&gt;");
adamc@597 956 }
adamc@597 957
adamc@582 958 function ts(x) { return x.toString() }
adamc@586 959 function bs(b) { return (b ? "True" : "False") }
adamc@586 960
adamc@1057 961 function id(x) { return x; }
adamc@1038 962 function sub(s, i) { return s.charAt(i); }
adamc@828 963 function suf(s, i) { return s.substring(i); }
adamc@828 964 function slen(s) { return s.length; }
adamc@829 965 function sidx(s, ch) {
adamc@1260 966 var r = s.indexOf(ch);
adamc@1260 967 if (r == -1)
adamc@1260 968 return null;
adamc@1260 969 else
adamc@1260 970 return r;
adamc@829 971 }
adamc@831 972 function sspn(s, chs) {
adamc@1260 973 for (var i = 0; i < s.length; ++i)
adamc@1260 974 if (chs.indexOf(s.charAt(i)) != -1)
adamc@1260 975 return i;
adamc@831 976
adamc@1260 977 return null;
adamc@831 978 }
adamc@829 979 function schr(s, ch) {
adamc@1260 980 var r = s.indexOf(ch);
adamc@1260 981 if (r == -1)
adamc@1260 982 return null;
adamc@1260 983 else
adamc@1260 984 return s.substring(r);
adamc@829 985 }
adamc@829 986 function ssub(s, start, len) {
adamc@1260 987 return s.substring(start, start+len);
adamc@829 988 }
adam@1624 989 function strlenGe(s, len) {
adam@1624 990 return s.length >= len;
adam@1624 991 }
adamc@821 992
adam@1621 993 function trimZeroes(s) {
adam@1621 994 for (var i = 0; i < s.length; ++i)
adam@1632 995 if (s.charAt(i) != '0') {
adam@1621 996 if (i > 0)
adam@1621 997 return s.substring(i);
adam@1621 998 else
adam@1621 999 return s;
adam@1621 1000 }
adam@1621 1001
adam@1631 1002 if (s.length == 0)
adam@1621 1003 return s;
adam@1621 1004 else
adam@1631 1005 return "0";
adam@1621 1006 }
adam@1621 1007
adamc@649 1008 function pi(s) {
adam@1631 1009 var st = trimZeroes(s);
adam@1631 1010 var r = parseInt(st);
adam@1631 1011 if (r.toString() == st)
adamc@1260 1012 return r;
adamc@1260 1013 else
adamc@1260 1014 er("Can't parse int: " + s);
adamc@649 1015 }
adamc@649 1016
adamc@649 1017 function pfl(s) {
adamc@1260 1018 var r = parseFloat(s);
adamc@1260 1019 if (r.toString() == s)
adamc@1260 1020 return r;
adamc@1260 1021 else
adamc@1260 1022 er("Can't parse float: " + s);
adamc@649 1023 }
adamc@649 1024
adamc@838 1025 function pio(s) {
adam@1631 1026 var st = trimZeroes(s);
adam@1631 1027 var r = parseInt(st);
adam@1631 1028 if (r.toString() == st)
adamc@1260 1029 return r;
adamc@1260 1030 else
adamc@1260 1031 return null;
adamc@838 1032 }
adamc@838 1033
adamc@838 1034 function pflo(s) {
adamc@1260 1035 var r = parseFloat(s);
adamc@1260 1036 if (r.toString() == s)
adamc@1260 1037 return r;
adamc@1260 1038 else
adamc@1260 1039 return null;
adamc@838 1040 }
adamc@838 1041
adam@1620 1042 function parseSource(s1, s2) {
adam@1620 1043 return eval("s" + s1 + "_" + s2);
adam@1620 1044 }
adam@1620 1045
adamc@692 1046 function uf(s) {
adamc@1260 1047 if (s.length == 0)
adamc@1260 1048 return "_";
adamc@1260 1049 s = s.replace(new RegExp ("\\.", "g"), ".2E");
adamc@1260 1050 return (s.charAt(0) == '_' ? "_" : "") + encodeURIComponent(s).replace(new RegExp ("%", "g"), ".");
adamc@691 1051 }
adamc@691 1052
adamc@692 1053 function uu(s) {
adamc@1260 1054 if (s.length > 0 && s.charAt(0) == '_') {
adamc@1260 1055 s = s.substring(1);
adamc@1260 1056 } else if (s.length >= 3 && (s.charAt(0) == '%' || s.charAt(0) == '.')
adamc@1260 1057 && s.charAt(1) == '5' && (s.charAt(2) == 'f' || s.charAt(2) == 'F'))
adamc@1260 1058 s = s.substring(3);
adamc@1260 1059 s = s.replace(new RegExp ("\\+", "g"), " ");
adamc@1260 1060 s = s.replace(new RegExp ("\\.", "g"), "%");
adamc@1260 1061 return decodeURIComponent(s);
adamc@905 1062 }
adamc@905 1063
adamc@1108 1064 function atr(s) {
adamc@1260 1065 return s.replace(new RegExp ("\"", "g"), "&quot;").replace(new RegExp ("&", "g"), "&amp;")
adamc@1260 1066 }
adamc@1108 1067
adamc@912 1068 function ub(b) {
adamc@1260 1069 return b ? "1" : "0";
adamc@912 1070 }
adamc@912 1071
adamc@905 1072 function uul(getToken, getData) {
adamc@1260 1073 var tok = getToken();
adamc@1260 1074 if (tok == "Nil") {
adamc@1260 1075 return null;
adamc@1260 1076 } else if (tok == "Cons") {
adamc@1260 1077 var d = getData();
adamc@1260 1078 var l = uul(getToken, getData);
adamc@1260 1079 return {_1:d, _2:l};
adamc@1260 1080 } else
adamc@1260 1081 whine("Can't unmarshal list (" + tok + ")");
adamc@692 1082 }
adamc@692 1083
adamc@961 1084 function strcmp(str1, str2) {
adamc@1260 1085 return ((str1 == str2) ? 0 : ((str1 > str2) ? 1 : -1));
adamc@961 1086 }
adamc@692 1087
adamc@603 1088
adamc@692 1089 // Remote calls
adamc@609 1090
adamc@703 1091 var client_id = null;
adamc@668 1092 var client_pass = 0;
adamc@668 1093 var url_prefix = "/";
adamc@673 1094 var timeout = 60;
adam@1552 1095 var isPost = false;
adamc@668 1096
adamc@668 1097 function getXHR(uri)
adamc@609 1098 {
adamc@609 1099 try {
adamc@1260 1100 return new XMLHttpRequest();
adamc@609 1101 } catch (e) {
adamc@1260 1102 try {
adamc@1260 1103 return new ActiveXObject("Msxml2.XMLHTTP");
adamc@1260 1104 } catch (e) {
adamc@1260 1105 try {
adamc@1260 1106 return new ActiveXObject("Microsoft.XMLHTTP");
adamc@1260 1107 } catch (e) {
adamc@1260 1108 whine("Your browser doesn't seem to support AJAX.");
adamc@1260 1109 }
adamc@1260 1110 }
adamc@609 1111 }
adamc@609 1112 }
adamc@609 1113
adamc@736 1114 var sig = null;
adamc@736 1115
adamc@1042 1116 var unloading = false, inFlight = null;
adamc@1042 1117
adamc@1042 1118 function unload() {
adamc@1260 1119 unloading = true;
adamc@1042 1120
adamc@1260 1121 for (; inFlight; inFlight = inFlight.next) {
adamc@1260 1122 inFlight.data.abort();
adamc@1260 1123 }
adamc@1042 1124 }
adamc@1042 1125
adamc@736 1126 function requestUri(xhr, uri, needsSig) {
adamc@1260 1127 if (unloading)
adamc@1260 1128 return;
adamc@1042 1129
adamc@1260 1130 xhr.open("POST", uri, true);
adamc@1260 1131 xhr.setRequestHeader("Content-type", "text/plain");
adam@1549 1132 try {
adam@1549 1133 xhr.setRequestHeader("Content-length", "0");
adam@1549 1134 xhr.setRequestHeader("Connection", "close");
adam@1549 1135 } catch (e) { }
adamc@668 1136
adamc@1260 1137 if (client_id != null) {
adamc@1260 1138 xhr.setRequestHeader("UrWeb-Client", client_id.toString());
adamc@1260 1139 xhr.setRequestHeader("UrWeb-Pass", client_pass.toString());
adamc@1260 1140 }
adamc@668 1141
adamc@1260 1142 if (needsSig) {
adamc@1260 1143 if (sig == null)
adamc@1260 1144 whine("Missing cookie signature!");
adamc@736 1145
adamc@1260 1146 xhr.setRequestHeader("UrWeb-Sig", sig);
adamc@1260 1147 }
adamc@736 1148
adamc@1260 1149 inFlight = cons(xhr, inFlight);
adamc@1260 1150 xhr.send(null);
adamc@668 1151 }
adamc@668 1152
adamc@1042 1153 function xhrFinished(xhr) {
adamc@1260 1154 xhr.abort();
adamc@1260 1155 inFlight = remove(xhr, inFlight);
adamc@1042 1156 }
adamc@1042 1157
adamc@1111 1158 function unurlify(parse, s) {
adamc@1260 1159 return parse(s);
adamc@1111 1160 }
adamc@1111 1161
adam@1385 1162 function redirect(s) {
adam@1385 1163 window.location = s;
adam@1385 1164 }
adam@1385 1165
adamc@978 1166 function rc(prefix, uri, parse, k, needsSig) {
adamc@1260 1167 uri = cat(prefix, uri);
adamc@1260 1168 uri = flattenLocal(uri);
adamc@1260 1169 var xhr = getXHR();
adamc@609 1170
adamc@1260 1171 xhr.onreadystatechange = function() {
adamc@1260 1172 if (xhr.readyState == 4) {
adamc@1260 1173 var isok = false;
adamc@612 1174
adamc@1260 1175 try {
adamc@1260 1176 if (xhr.status == 200)
adamc@1260 1177 isok = true;
adamc@1260 1178 } catch (e) { }
adamc@612 1179
adamc@1260 1180 if (isok) {
adam@1446 1181 var lines = xhr.responseText.split("\n");
adam@1446 1182 if (lines.length != 2)
adam@1446 1183 whine("Bad RPC response lines");
adam@1446 1184
adam@1446 1185 eval(lines[0]);
adam@1446 1186
adamc@1260 1187 try {
adam@1446 1188 k(parse(lines[1]));
adamc@1260 1189 } catch (v) {
adamc@1260 1190 doExn(v);
adamc@1260 1191 }
adamc@1260 1192 } else {
adamc@1260 1193 conn();
adamc@1260 1194 }
adamc@1260 1195
adamc@1260 1196 xhrFinished(xhr);
adamc@729 1197 }
adamc@1260 1198 };
adamc@1042 1199
adamc@1260 1200 requestUri(xhr, uri, needsSig);
adamc@609 1201 }
adamc@667 1202
adamc@667 1203 function path_join(s1, s2) {
adamc@1260 1204 if (s1.length > 0 && s1.charAt(s1.length-1) == '/')
adamc@1260 1205 return s1 + s2;
adamc@1260 1206 else
adamc@1260 1207 return s1 + "/" + s2;
adamc@667 1208 }
adamc@667 1209
adamc@670 1210 var channels = [];
adamc@670 1211
adamc@670 1212 function newQueue() {
adamc@1260 1213 return { front : null, back : null };
adamc@670 1214 }
adamc@670 1215 function enqueue(q, v) {
adamc@1260 1216 if (q.front == null) {
adamc@1260 1217 q.front = cons(v, null);
adamc@1260 1218 q.back = q.front;
adamc@1260 1219 } else {
adamc@1260 1220 var node = cons(v, null);
adamc@1260 1221 q.back.next = node;
adamc@1260 1222 q.back = node;
adamc@1260 1223 }
adamc@670 1224 }
adamc@670 1225 function dequeue(q) {
adamc@670 1226 if (q.front == null)
adamc@1260 1227 return null;
adamc@1260 1228 else {
adamc@1260 1229 var r = q.front.data;
adamc@1260 1230 q.front = q.front.next;
adamc@1260 1231 if (q.front == null)
adamc@1260 1232 q.back = null;
adamc@1260 1233 return r;
adamc@1260 1234 }
adamc@670 1235 }
adamc@670 1236
adamc@670 1237 function newChannel() {
adamc@1260 1238 return { msgs : newQueue(), listeners : newQueue() };
adamc@670 1239 }
adamc@670 1240
adamc@667 1241 function listener() {
adamc@1260 1242 var uri = path_join(url_prefix, ".msgs");
adamc@1260 1243 var xhr = getXHR();
adamc@1260 1244 var tid, orsc, onTimeout;
adamc@673 1245
adamc@1260 1246 var connect = function () {
adamc@1260 1247 xhr.onreadystatechange = orsc;
adamc@1260 1248 tid = window.setTimeout(onTimeout, timeout * 500);
adamc@1260 1249 requestUri(xhr, uri, false);
adamc@1260 1250 }
adamc@673 1251
adamc@1260 1252 orsc = function() {
adamc@1260 1253 if (xhr.readyState == 4) {
adamc@1260 1254 window.clearTimeout(tid);
adamc@673 1255
adamc@1260 1256 var isok = false;
adamc@667 1257
adamc@1260 1258 try {
adamc@1260 1259 if (xhr.status == 200)
adamc@1260 1260 isok = true;
adamc@1260 1261 } catch (e) { }
adamc@667 1262
adamc@1260 1263 if (isok) {
adam@1447 1264 var text = xhr.responseText;
adamc@1260 1265 if (text == "")
adamc@1260 1266 return;
adamc@1260 1267 var lines = text.split("\n");
adamc@889 1268
adam@1552 1269 if (lines.length == 1 && lines[0] == "R") {
adam@1553 1270 lameDuck = true;
adam@1553 1271
adam@1552 1272 if (isPost)
adam@1552 1273 history.back();
adam@1552 1274 else
adam@1552 1275 location.reload();
adam@1552 1276
adam@1552 1277 return;
adam@1552 1278 }
adam@1552 1279
adamc@1260 1280 if (lines.length < 2) {
adamc@1260 1281 discon();
adamc@1260 1282 return;
adamc@1260 1283 }
adamc@1260 1284
adam@1447 1285 var messageReader = function(i) {
adam@1447 1286 if (i+1 >= lines.length) {
adam@1447 1287 xhrFinished(xhr);
adam@1447 1288 connect();
adam@1447 1289 }
adam@1447 1290 else {
adam@1447 1291 var chn = lines[i];
adam@1447 1292 var msg = lines[i+1];
adamc@1260 1293
adam@1447 1294 if (chn == "E") {
adam@1447 1295 eval(msg);
adam@1447 1296 window.setTimeout(function() { messageReader(i+2); }, 0);
adam@1447 1297 } else {
adam@1447 1298 if (chn < 0)
adam@1447 1299 whine("Out-of-bounds channel in message from remote server");
adamc@1260 1300
adam@1447 1301 var ch;
adamc@1260 1302
adam@1447 1303 if (chn >= channels.length || channels[chn] == null) {
adam@1447 1304 ch = newChannel();
adam@1447 1305 channels[chn] = ch;
adam@1447 1306 } else
adam@1447 1307 ch = channels[chn];
adamc@1260 1308
adam@1447 1309 var listener = dequeue(ch.listeners);
adam@1447 1310 if (listener == null) {
adam@1447 1311 enqueue(ch.msgs, msg);
adam@1447 1312 } else {
adam@1447 1313 try {
adam@1447 1314 listener(msg);
adam@1447 1315 } catch (v) {
adam@1447 1316 doExn(v);
adam@1447 1317 }
adam@1447 1318 }
adam@1447 1319
adam@1447 1320 messageReader(i+2);
adamc@1260 1321 }
adamc@1260 1322 }
adamc@1260 1323 }
adamc@1260 1324
adam@1447 1325 messageReader(0);
adamc@1260 1326 }
adamc@1260 1327 else {
adamc@1260 1328 try {
adamc@1260 1329 if (xhr.status != 0)
adamc@1260 1330 servErr("Error querying remote server for messages: " + xhr.status);
adamc@1260 1331 } catch (e) { }
adamc@1260 1332 }
adamc@729 1333 }
adamc@1260 1334 };
adamc@669 1335
adamc@1260 1336 onTimeout = function() {
adamc@1260 1337 xhrFinished(xhr);
adamc@1260 1338 connect();
adamc@1260 1339 };
adamc@670 1340
adamc@673 1341 connect();
adamc@667 1342 }
adamc@670 1343
adamc@670 1344 function rv(chn, parse, k) {
adamc@1260 1345 if (chn == null)
adamc@1260 1346 return;
adamc@682 1347
adamc@1260 1348 if (chn < 0)
adamc@1260 1349 whine("Out-of-bounds channel receive");
adamc@670 1350
adamc@1260 1351 var ch;
adamc@670 1352
adamc@1260 1353 if (chn >= channels.length || channels[chn] == null) {
adamc@1260 1354 ch = newChannel();
adamc@1260 1355 channels[chn] = ch;
adamc@1260 1356 } else
adamc@1260 1357 ch = channels[chn];
adamc@670 1358
adamc@1260 1359 var msg = dequeue(ch.msgs);
adamc@1260 1360 if (msg == null) {
adamc@1260 1361 enqueue(ch.listeners, function(msg) { k(parse(msg)); });
adamc@1260 1362 } else {
adamc@1260 1363 try {
adamc@1260 1364 k(parse(msg));
adamc@1260 1365 } catch (v) {
adamc@1260 1366 doExn(v);
adamc@1260 1367 }
adamc@728 1368 }
adamc@670 1369 }
adamc@693 1370
adamc@978 1371 function sl(ms, k) {
adamc@1260 1372 window.setTimeout(function() { k(null); }, ms);
adamc@1021 1373 }
adamc@1021 1374
adamc@1021 1375 function sp(e) {
adamc@1260 1376 execF(e, null);
adamc@978 1377 }
adamc@978 1378
adamc@693 1379
adamc@970 1380 // The Ur interpreter
adamc@970 1381
adamc@970 1382 var urfuncs = [];
adamc@970 1383
adamc@970 1384 function lookup(env, n) {
adamc@1260 1385 while (env != null) {
adamc@1260 1386 if (n == 0)
adamc@1260 1387 return env.data;
adamc@1260 1388 else {
adamc@1260 1389 --n;
adamc@1260 1390 env = env.next;
adamc@1260 1391 }
adamc@970 1392 }
adamc@970 1393
adamc@1260 1394 whine("Out-of-bounds Ur variable reference");
adamc@970 1395 }
adamc@970 1396
adamc@974 1397 function execP(env, p, v) {
adamc@1260 1398 switch (p.c) {
adamc@1260 1399 case "w":
adamc@1260 1400 return env;
adamc@1260 1401 case "v":
adamc@1260 1402 return cons(v, env);
adamc@1260 1403 case "c":
adamc@1260 1404 if (v == p.v)
adamc@1260 1405 return env;
adamc@1260 1406 else
adamc@1260 1407 return false;
adamc@1260 1408 case "s":
adamc@1260 1409 if (v == null)
adamc@1260 1410 return false;
adamc@1260 1411 else
adamc@1260 1412 return execP(env, p.p, p.n ? v.v : v);
adamc@1260 1413 case "1":
adamc@1260 1414 if (v.n != p.n)
adamc@1260 1415 return false;
adamc@1260 1416 else
adamc@1260 1417 return execP(env, p.p, v.v);
adamc@1260 1418 case "r":
adamc@1260 1419 for (var fs = p.l; fs != null; fs = fs.next) {
adamc@1260 1420 env = execP(env, fs.data.p, v["_" + fs.data.n]);
adamc@1260 1421 if (env == false)
adamc@1260 1422 return false;
adamc@1260 1423 }
adamc@1260 1424 return env;
adamc@1260 1425 default:
adamc@1260 1426 whine("Unknown Ur pattern kind" + p.c);
adamc@974 1427 }
adamc@974 1428 }
adamc@974 1429
adamc@970 1430 function exec0(env, e) {
adamc@1260 1431 return exec1(env, null, e);
adamc@1020 1432 }
adamc@1020 1433
adamc@1020 1434 function exec1(env, stack, e) {
adamc@1260 1435 var stack, usedK = false;
adamc@970 1436
adamc@1260 1437 var saveEnv = function() {
adamc@1260 1438 if (stack.next != null && stack.next.data.c != "<")
adamc@1260 1439 stack = cons({c: "<", env: env}, stack.next);
adamc@1260 1440 else
adamc@1260 1441 stack = stack.next;
adamc@1260 1442 };
adamc@983 1443
adamc@1260 1444 while (true) {
adamc@1260 1445 switch (e.c) {
adamc@1260 1446 case "c":
adamc@1260 1447 var v = e.v;
adamc@1260 1448 if (stack == null)
adamc@1260 1449 return v;
adamc@1260 1450 var fr = stack.data;
adamc@970 1451
adamc@1260 1452 switch (fr.c) {
adamc@1260 1453 case "s":
adamc@1260 1454 e = {c: "c", v: {v: v}};
adamc@1260 1455 stack = stack.next;
adamc@1260 1456 break;
adamc@1260 1457 case "1":
adamc@1260 1458 e = {c: "c", v: {n: fr.n, v: v}};
adamc@1260 1459 stack = stack.next;
adamc@1260 1460 break;
adamc@1260 1461 case "f":
adamc@1260 1462 fr.args[fr.pos++] = v;
adamc@1260 1463 if (fr.a == null) {
adamc@1260 1464 var res;
adamc@1260 1465 stack = stack.next;
adamc@1035 1466
adamc@1260 1467 if (fr.f.apply)
adamc@1260 1468 res = fr.f.apply(null, fr.args);
adamc@1260 1469 else if (fr.args.length == 0)
adamc@1260 1470 res = fr.f();
adamc@1260 1471 else if (fr.args.length == 1)
adamc@1260 1472 res = fr.f(fr.args[0]);
adamc@1260 1473 else if (fr.args.length == 2)
adamc@1260 1474 res = fr.f(fr.args[0], fr.args[1]);
adamc@1260 1475 else if (fr.args.length == 3)
adamc@1260 1476 res = fr.f(fr.args[0], fr.args[1], fr.args[2]);
adamc@1260 1477 else if (fr.args.length == 4)
adamc@1260 1478 res = fr.f(fr.args[0], fr.args[1], fr.args[2], fr.args[3]);
adamc@1260 1479 else if (fr.args.length == 5)
adamc@1260 1480 res = fr.f(fr.args[0], fr.args[1], fr.args[2], fr.args[3], fr.args[4]);
adamc@1260 1481 else
adamc@1260 1482 whine("Native function has " + fr.args.length + " args, but there is no special case for that count.");
adamc@1035 1483
adamc@1260 1484 e = {c: "c", v: res};
adamc@1260 1485 if (usedK) return null;
adamc@1260 1486 } else {
adamc@1260 1487 e = fr.a.data;
adamc@1260 1488 fr.a = fr.a.next;
adamc@1260 1489 }
adamc@1260 1490 break;
adamc@1260 1491 case "a1":
adamc@1260 1492 e = fr.x;
adamc@1260 1493 stack = cons({c: "a2", f: v}, stack.next);
adamc@1260 1494 break;
adamc@1260 1495 case "a2":
adamc@1260 1496 if (fr.f == null)
adamc@1260 1497 whine("Ur: applying null function");
adamc@1260 1498 else if (fr.f.body) {
adamc@1260 1499 saveEnv();
adamc@1260 1500 env = cons(v, fr.f.env);
adamc@1260 1501 e = fr.f.body;
adamc@1260 1502 } else {
adamc@1260 1503 e = {c: "c", v: fr.f(v)};
adamc@1260 1504 stack = stack.next;
adamc@1260 1505 }
adamc@1260 1506 break;
adamc@1260 1507 case "<":
adamc@1260 1508 env = fr.env;
adamc@1260 1509 stack = stack.next;
adamc@1260 1510 break;
adamc@1260 1511 case "r":
adamc@1260 1512 fr.fs["_" + fr.n] = v;
adamc@1260 1513 if (fr.l == null) {
adamc@1260 1514 e = {c: "c", v: fr.fs};
adamc@1260 1515 stack = stack.next;
adamc@1260 1516 } else {
adamc@1260 1517 fr.n = fr.l.data.n;
adamc@1260 1518 e = fr.l.data.v;
adamc@1260 1519 fr.l = fr.l.next;
adamc@1260 1520 }
adamc@1260 1521 break;
adamc@1260 1522 case ".":
adamc@1260 1523 e = {c: "c", v: v["_" + fr.f]};
adamc@1260 1524 stack = stack.next;
adamc@1260 1525 break;
adamc@1260 1526 case ";":
adamc@1260 1527 e = fr.e2;
adamc@1260 1528 stack = stack.next;
adamc@1260 1529 break;
adamc@1260 1530 case "=":
adamc@1260 1531 saveEnv();
adamc@1260 1532 env = cons(v, env);
adamc@1260 1533 e = fr.e2;
adamc@1260 1534 break;
adamc@1260 1535 case "m":
adamc@1260 1536 var ps;
adamc@1260 1537 for (ps = fr.p; ps != null; ps = ps.next) {
adamc@1260 1538 var r = execP(env, ps.data.p, v);
adamc@1260 1539 if (r != false) {
adamc@1260 1540 saveEnv();
adamc@1260 1541 env = r;
adamc@1260 1542 e = ps.data.b;
adamc@1260 1543 break;
adamc@1260 1544 }
adamc@1260 1545 }
adamc@1260 1546 if (ps == null)
adamc@1260 1547 whine("Match failure in Ur interpretation");
adamc@1260 1548 break;
adamc@1260 1549 default:
adamc@1260 1550 whine("Unknown Ur continuation kind " + fr.c);
adamc@1260 1551 }
adamc@1260 1552
adamc@1260 1553 break;
adamc@1260 1554 case "v":
adamc@1260 1555 e = {c: "c", v: lookup(env, e.n)};
adamc@1260 1556 break;
adamc@1260 1557 case "n":
adamc@1260 1558 var idx = e.n;
adamc@1260 1559 e = urfuncs[idx];
adamc@1260 1560 if (e.c == "t")
adamc@1262 1561 e = urfuncs[idx] = eval("(" + e.f + ")");
adamc@1260 1562 break;
adamc@1260 1563 case "s":
adamc@1260 1564 stack = cons({c: "s"}, stack);
adamc@1260 1565 e = e.v;
adamc@1260 1566 break;
adamc@1260 1567 case "1":
adamc@1260 1568 stack = cons({c: "1", n: e.n}, stack);
adamc@1260 1569 e = e.v;
adamc@1260 1570 break;
adamc@1260 1571 case "f":
adamc@1260 1572 if (e.a == null)
adamc@1260 1573 e = {c: "c", v: (eval(e.f))()};
adamc@1260 1574 else {
adamc@1260 1575 var args = [];
adamc@1260 1576 stack = cons({c: "f", f: eval(e.f), args: args, pos: 0, a: e.a.next}, stack);
adamc@1260 1577 if (!e.a.data.c) alert("[2] fr.f = " + e.f + "; 0 = " + e.a.data);
adamc@1260 1578 e = e.a.data;
adamc@1260 1579 }
adamc@1260 1580 break;
adamc@1260 1581 case "l":
adamc@1260 1582 e = {c: "c", v: {env: env, body: e.b}};
adamc@1260 1583 break;
adamc@1260 1584 case "a":
adamc@1260 1585 stack = cons({c: "a1", x: e.x}, stack);
adamc@1260 1586 e = e.f;
adamc@1260 1587 break;
adamc@1260 1588 case "r":
adamc@1260 1589 if (e.l == null)
adamc@1260 1590 whine("Empty Ur record in interpretation");
adamc@1260 1591 var fs = {};
adamc@1260 1592 stack = cons({c: "r", n: e.l.data.n, fs: fs, l: e.l.next}, stack);
adamc@1260 1593 e = e.l.data.v;
adamc@1260 1594 break;
adamc@1260 1595 case ".":
adamc@1260 1596 stack = cons({c: ".", f: e.f}, stack);
adamc@1260 1597 e = e.r;
adamc@1260 1598 break;
adamc@1260 1599 case ";":
adamc@1260 1600 stack = cons({c: ";", e2: e.e2}, stack);
adamc@1260 1601 e = e.e1;
adamc@1260 1602 break;
adamc@1260 1603 case "=":
adamc@1260 1604 stack = cons({c: "=", e2: e.e2}, stack);
adamc@1260 1605 e = e.e1;
adamc@1260 1606 break;
adamc@1260 1607 case "m":
adamc@1260 1608 stack = cons({c: "m", p: e.p}, stack);
adamc@1260 1609 e = e.e;
adamc@1260 1610 break;
adamc@1260 1611 case "e":
adamc@1260 1612 e = {c: "c", v: cs({c: "wc", env: env, body: e.e})};
adamc@1260 1613 break;
adamc@1260 1614 case "wc":
adamc@1260 1615 env = e.env;
adamc@1260 1616 e = e.body;
adamc@1260 1617 break;
adamc@1260 1618 case "K":
adamc@1260 1619 { var savedStack = stack.next, savedEnv = env;
adamc@1260 1620 e = {c: "c", v: function(v) { return exec1(savedEnv, savedStack, {c: "c", v: v}); } };}
adamc@1260 1621 usedK = true;
rmbruijn@1597 1622 break;
adamc@1260 1623 default:
adamc@1260 1624 whine("Unknown Ur expression kind " + e.c);
adamc@970 1625 }
adamc@970 1626 }
adamc@970 1627 }
adamc@970 1628
adamc@976 1629 function execD(e) {
adamc@1260 1630 return exec0(null, e);
adamc@976 1631 }
adamc@976 1632
adamc@970 1633 function exec(e) {
adamc@1260 1634 var r = exec0(null, e);
adamc@970 1635
adamc@1260 1636 if (r != null && r.body != null)
adamc@1260 1637 return function(v) { return exec0(cons(v, r.env), r.body); };
adamc@1260 1638 else
adamc@1260 1639 return r;
adamc@895 1640 }
adamc@895 1641
adamc@977 1642 function execF(f, x) {
adamc@1260 1643 return exec0(cons(x, f.env), f.body);
adamc@977 1644 }
adamc@977 1645
adamc@895 1646
adam@1290 1647 // Wrappers
adam@1290 1648
adam@1290 1649 function confrm(s) {
adam@1290 1650 return confirm(s) ? true : false;
adam@1290 1651 }
adam@1290 1652
adam@1290 1653
adamc@1323 1654 // URL blessing
adamc@1323 1655
adamc@1323 1656 var urlRules = null;
adamc@1323 1657
adamc@1323 1658 function checkUrl(s) {
adamc@1323 1659 for (var r = urlRules; r; r = r.next) {
adamc@1323 1660 var ru = r.data;
adamc@1323 1661 if (ru.prefix ? s.indexOf(ru.pattern) == 0 : s == ru.pattern)
adamc@1323 1662 return ru.allow ? s : null;
adamc@1323 1663 }
adamc@1323 1664
adamc@1323 1665 return null;
adamc@1323 1666 }
adamc@1323 1667
adamc@1323 1668 function bless(s) {
adamc@1323 1669 u = checkUrl(s);
adamc@1323 1670 if (u == null)
adamc@1323 1671 er("Disallowed URL: " + s);
adamc@1323 1672 return u;
adamc@1323 1673 }
adamc@1323 1674
adam@1556 1675
adam@1556 1676 // ID generation
adam@1556 1677
adam@1556 1678 var nextId = 0;
adam@1556 1679
adam@1556 1680 function fresh() {
adam@1556 1681 return (--nextId).toString();
adam@1556 1682 }
adam@1556 1683
rmbruijn@1597 1684
adamc@693 1685 // App-specific code