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annotate lib/js/urweb.js @ 1680:5b2c7b9f6017

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Fix fetching of keycodes for key events
author Adam Chlipala <adam@chlipala.net>
date Sun, 15 Jan 2012 14:45:06 -0500
parents d05299e561c8
children e8a84494d2c0
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) {
adam@1678 646 if (thisScript) {
adam@1678 647 if (thisScript.parentNode)
adam@1678 648 thisScript.parentNode.replaceChild(node, thisScript);
adam@1678 649 } else
adamc@1260 650 lastParent().appendChild(node);
adamc@603 651 }
adamc@603 652
adamc@690 653 var thisScript = null;
adamc@690 654
adamc@604 655 function runScripts(node) {
adamc@1260 656 if (node.getElementsByTagName) {
adamc@1260 657 var savedScript = thisScript;
adamc@603 658
adamc@1260 659 var scripts = node.getElementsByTagName("script"), scriptsCopy = [];
adamc@1260 660 var len = scripts.length;
adamc@1260 661 for (var i = 0; i < len; ++i)
adamc@1260 662 scriptsCopy[i] = scripts[i];
adamc@1260 663 for (var i = 0; i < len; ++i) {
adamc@1260 664 thisScript = scriptsCopy[i];
adamc@1039 665
adamc@1260 666 try {
adamc@1260 667 eval(thisScript.text);
adamc@1260 668 } catch (v) {
adamc@1260 669 doExn(v);
adamc@1260 670 }
adamc@1260 671 if (thisScript.parentNode)
adamc@1260 672 thisScript.parentNode.removeChild(thisScript);
adamc@1260 673 }
adamc@1260 674
adamc@1260 675 thisScript = savedScript;
adamc@729 676 }
adamc@603 677 }
adamc@603 678
adamc@603 679
adamc@692 680 // Dynamic tree entry points
adamc@692 681
adamc@967 682 function killScript(scr) {
adamc@1260 683 scr.dead = true;
adamc@1260 684 for (var ls = scr.sources; ls; ls = ls.next)
adamc@1260 685 ls.data.dyns = remove(scr, ls.data.dyns);
adamc@1260 686 for (var ls = scr.closures; ls; ls = ls.next)
adamc@1260 687 freeClosure(ls.data);
adamc@967 688 }
adamc@967 689
adam@1538 690 // Sometimes we wind up with tables that contain <script>s outside the single <tbody>.
adam@1538 691 // To avoid dealing with that case, we normalize by moving <script>s into <tbody>.
adam@1538 692 function normalizeTable(table) {
adam@1538 693 var orig = table;
adam@1538 694
adam@1538 695 var script, next;
adam@1538 696
adam@1538 697 while (table.tagName != "TABLE")
adam@1538 698 table = table.parentNode;
adam@1538 699
adam@1538 700 for (var tbody = table.firstChild; tbody; tbody = tbody.nextSibling) {
adam@1538 701 if (tbody.tagName == "TBODY") {
adam@1538 702 for (script = table.firstChild; script && script != tbody; script = next) {
adam@1538 703 next = script.nextSibling;
adam@1538 704
adam@1538 705 tbody.insertBefore(script, tbody.firstChild);
adam@1538 706 }
adam@1538 707
adam@1538 708 return;
adam@1538 709 }
adam@1538 710 }
adam@1538 711
adam@1538 712 var tbody = document.createElement("tbody");
adam@1538 713 for (script = table.firstChild; script; script = next) {
adam@1538 714 next = script.nextSibling;
rmbruijn@1597 715
adam@1538 716 tbody.insertBefore(script, tbody.firstChild);
adam@1538 717 }
adam@1538 718 table.appendChild(tbody);
adam@1538 719 }
adam@1538 720
adamc@901 721 function dyn(pnode, s) {
adamc@1260 722 var x = document.createElement("script");
adamc@1260 723 x.dead = false;
adamc@1260 724 x.signal = s;
adamc@1260 725 x.sources = null;
adamc@1260 726 x.closures = null;
adamc@899 727
adamc@1260 728 var firstChild = null;
adamc@899 729
adamc@1260 730 x.recreate = function(v) {
adamc@1260 731 for (var ls = x.closures; ls; ls = ls.next)
adamc@1260 732 freeClosure(ls.data);
adamc@945 733
adamc@946 734 var next;
adamc@1260 735 for (var child = firstChild; child && child != x; child = next) {
adamc@1260 736 next = child.nextSibling;
adamc@1260 737
adamc@1260 738 killScript(child);
adamc@1260 739 if (child.getElementsByTagName) {
adamc@1260 740 var arr = child.getElementsByTagName("script");
adamc@1260 741 for (var i = 0; i < arr.length; ++i)
adamc@1260 742 killScript(arr[i]);
adamc@1260 743 }
adamc@1260 744
adamc@1260 745 if (child.parentNode)
adamc@1260 746 child.parentNode.removeChild(child);
adamc@946 747 }
adamc@903 748
adamc@1260 749 var cls = {v : null};
adamc@1260 750 var html = flatten(cls, v);
adamc@1260 751 if (pnode != "table" && pnode != "tr")
adamc@1260 752 html = dynPrefix + html;
adamc@1260 753 x.closures = cls.v;
adamc@946 754
adamc@1260 755 if (pnode == "table") {
adam@1538 756 normalizeTable(x.parentNode);
adam@1538 757
adamc@1260 758 var dummy = document.createElement("body");
adamc@1260 759 dummy.innerHTML = "<table>" + html + "</table>";
adamc@1260 760 runScripts(dummy);
adamc@1260 761 var table = x.parentNode;
adamc@1260 762
adamc@1260 763 if (table) {
adamc@1260 764 firstChild = null;
adamc@1260 765 var tbody;
adamc@1260 766
adamc@1260 767 var arr = dummy.getElementsByTagName("tbody");
adamc@1260 768
adamc@1260 769 var tbody;
adamc@1260 770 if (arr.length > 0 && arr[0].parentNode == dummy.firstChild) {
adamc@1260 771 tbody = arr[0];
adamc@1260 772 var next;
adamc@1260 773 for (var node = dummy.firstChild.firstChild; node; node = next) {
adamc@1260 774 next = node.nextSibling;
adamc@1260 775
adamc@1260 776 if (node.tagName != "TBODY")
adamc@1260 777 tbody.appendChild(node);
adamc@1260 778 }
adamc@1260 779 } else
adamc@1260 780 tbody = dummy.firstChild;
adamc@1260 781
adamc@1260 782 var next;
adamc@1260 783 firstChild = document.createElement("script");
adamc@1260 784 table.insertBefore(firstChild, x);
adamc@1260 785 for (var node = tbody.firstChild; node; node = next) {
adamc@1260 786 next = node.nextSibling;
adamc@1260 787 table.insertBefore(node, x);
adamc@1260 788 }
adamc@1260 789 }
adamc@1260 790 } else if (pnode == "tr") {
adamc@1260 791 var dummy = document.createElement("body");
adamc@1260 792 dummy.innerHTML = "<table><tr>" + html + "</tr></table>";
adamc@1260 793 runScripts(dummy);
adamc@1260 794 var table = x.parentNode;
adamc@1260 795
adamc@1260 796 if (table) {
adamc@1260 797 var arr = dummy.getElementsByTagName("tr");
adamc@1260 798 firstChild = null;
adamc@1260 799 var tr;
adamc@1260 800 if (arr.length > 0 && table != null)
adamc@1260 801 tr = arr[0];
adamc@1260 802 else
adamc@1260 803 tr = dummy.firstChild;
adamc@1260 804
adamc@1260 805 var next;
adamc@1260 806 firstChild = document.createElement("script");
adamc@1260 807 table.insertBefore(firstChild, x);
adamc@1260 808 for (var node = tr.firstChild; node; node = next) {
adamc@1260 809 next = node.nextSibling;
adamc@1260 810 table.insertBefore(node, x);
adamc@1260 811 }
adamc@1260 812 }
adamc@1260 813 } else {
adamc@1260 814 firstChild = document.createElement("span");
adamc@1260 815 firstChild.innerHTML = html;
adam@1652 816 runScripts(firstChild);
adamc@1260 817 if (x.parentNode)
adamc@1260 818 x.parentNode.insertBefore(firstChild, x);
adamc@903 819 }
adamc@1260 820 };
adamc@899 821
adamc@1260 822 addNode(x);
adamc@1260 823 populate(x);
adamc@571 824 }
adamc@582 825
adam@1463 826 function input(x, s, recreate, type, name) {
adam@1463 827 if (name) x.name = name;
adamc@1260 828 if (type) x.type = type;
adamc@1260 829 x.dead = false;
adamc@1260 830 x.signal = ss(s);
adamc@1260 831 x.sources = null;
adamc@1260 832 x.recreate = recreate(x);
adamc@1260 833 addNode(x);
adamc@1260 834 populate(x);
adamc@816 835
adamc@1260 836 return x;
adamc@816 837 }
adamc@816 838
adam@1463 839 function inp(s, name) {
adamc@1260 840 var x = input(document.createElement("input"), s,
adam@1463 841 function(x) { return function(v) { if (x.value != v) x.value = v; }; }, null, name);
adamc@1260 842 x.value = s.data;
adam@1491 843 x.onkeyup = x.oninput = x.onchange = x.onpropertychange = function() { sv(s, x.value) };
adamc@816 844
adamc@1260 845 return x;
adamc@816 846 }
adamc@816 847
adam@1479 848 function selectValue(x) {
adam@1479 849 if (x.options.length == 0)
adam@1479 850 return "";
adam@1479 851 else
adam@1479 852 return x.options[x.selectedIndex].value;
adam@1479 853 }
adam@1479 854
adam@1479 855 function setSelectValue(x, v) {
adam@1479 856 for (var i = 0; i < x.options.length; ++i) {
adam@1479 857 if(x.options[i].value == v) {
adam@1479 858 x.selectedIndex = i;
adam@1479 859 return;
adam@1479 860 }
adam@1479 861 }
adam@1479 862 }
adam@1479 863
adamc@816 864 function sel(s, content) {
adamc@1260 865 var dummy = document.createElement("span");
adamc@1260 866 dummy.innerHTML = "<select>" + content + "</select>";
adam@1479 867 var x = input(dummy.firstChild, s, function(x) { return function(v) { if (selectValue(x) != v) setSelectValue(x, v); }; });
adam@1479 868
adam@1479 869 for (var i = 0; i < x.options.length; ++i) {
adam@1479 870 if (x.options[i].value == "")
adam@1479 871 x.options[i].value = x.options[i].text;
adam@1479 872 else
adam@1479 873 x.options[i].value = x.options[i].value.substring(1);
adam@1479 874 }
adam@1479 875
adam@1479 876 setSelectValue(x, s.data);
adam@1479 877 if (selectValue(x) != s.data)
adam@1479 878 sv(s, selectValue(x));
adam@1479 879 x.onchange = function() { sv(s, selectValue(x)) };
adamc@797 880
adamc@1260 881 return x;
adamc@598 882 }
adamc@598 883
adamc@817 884 function chk(s) {
adamc@1260 885 var x = input(document.createElement("input"), s,
adamc@1260 886 function(x) { return function(v) { if (x.checked != v) x.checked = v; }; }, "checkbox");
adamc@1260 887 x.defaultChecked = x.checked = s.data;
adam@1610 888 x.onclick = x.onkeyup = x.oninput = x.onchange = x.onpropertychange = function() { sv(s, x.checked) };
adamc@817 889
adamc@1260 890 return x;
adamc@817 891 }
adamc@817 892
adamc@1099 893 function tbx(s) {
adamc@1260 894 var x = input(document.createElement("textarea"), s,
adamc@1260 895 function(x) { return function(v) { if (x.innerHTML != v) x.innerHTML = v; }; });
adamc@1260 896 x.innerHTML = s.data;
adam@1491 897 x.onkeyup = x.oninput = x.onchange = x.onpropertychange = function() { sv(s, x.value) };
adamc@1099 898
adamc@1260 899 return x;
adamc@1099 900 }
adamc@1099 901
adam@1643 902 function dynClass(html, s) {
adam@1643 903 var htmlCls = {v : null};
adam@1643 904 html = flatten(htmlCls, html);
adam@1643 905 htmlCls = htmlCls.v;
adam@1643 906
adam@1643 907 var dummy = document.createElement("body");
adam@1643 908 dummy.innerHTML = html;
adam@1643 909 runScripts(dummy);
adam@1643 910 var html = dummy.firstChild;
adam@1643 911 dummy.removeChild(html);
adam@1643 912 addNode(html);
adam@1643 913
adam@1643 914 var x = document.createElement("script");
adam@1643 915 x.dead = false;
adam@1643 916 x.signal = s;
adam@1643 917 x.sources = null;
adam@1643 918 x.closures = htmlCls;
adam@1643 919
adam@1643 920 x.recreate = function(v) {
adam@1643 921 for (var ls = x.closures; ls != htmlCls; ls = ls.next)
adam@1643 922 freeClosure(ls.data);
adam@1643 923
adam@1643 924 var cls = {v : null};
adam@1643 925 html.className = flatten(cls, v);
adam@1643 926 x.closures = concat(cls.v, htmlCls);
adam@1643 927 };
adam@1643 928
adam@1643 929 addNode(x);
adam@1643 930 populate(x);
adam@1643 931 }
adam@1643 932
adamc@800 933 function addOnChange(x, f) {
adamc@1260 934 var old = x.onchange;
adam@1290 935 if (old == null)
adam@1290 936 x.onchange = f;
adam@1290 937 else
adam@1290 938 x.onchange = function() { old(); f(); };
adam@1290 939 }
adam@1290 940
adam@1290 941 function addOnKeyUp(x, f) {
adam@1290 942 var old = x.onkeyup;
adam@1290 943 if (old == null)
adam@1290 944 x.onkeyup = f;
adam@1290 945 else
adam@1290 946 x.onkeyup = function(x) { old(x); f(x); };
adamc@800 947 }
adamc@800 948
adamc@692 949
adamc@692 950 // Basic string operations
adamc@692 951
adamc@597 952 function eh(x) {
adamc@1260 953 if (x == null)
adamc@1260 954 return "NULL";
adamc@1260 955 else
adamc@1260 956 return x.split("&").join("&amp;").split("<").join("&lt;").split(">").join("&gt;");
adamc@597 957 }
adamc@597 958
adamc@582 959 function ts(x) { return x.toString() }
adamc@586 960 function bs(b) { return (b ? "True" : "False") }
adamc@586 961
adamc@1057 962 function id(x) { return x; }
adamc@1038 963 function sub(s, i) { return s.charAt(i); }
adamc@828 964 function suf(s, i) { return s.substring(i); }
adamc@828 965 function slen(s) { return s.length; }
adamc@829 966 function sidx(s, ch) {
adamc@1260 967 var r = s.indexOf(ch);
adamc@1260 968 if (r == -1)
adamc@1260 969 return null;
adamc@1260 970 else
adamc@1260 971 return r;
adamc@829 972 }
adamc@831 973 function sspn(s, chs) {
adamc@1260 974 for (var i = 0; i < s.length; ++i)
adamc@1260 975 if (chs.indexOf(s.charAt(i)) != -1)
adamc@1260 976 return i;
adamc@831 977
adamc@1260 978 return null;
adamc@831 979 }
adamc@829 980 function schr(s, ch) {
adamc@1260 981 var r = s.indexOf(ch);
adamc@1260 982 if (r == -1)
adamc@1260 983 return null;
adamc@1260 984 else
adamc@1260 985 return s.substring(r);
adamc@829 986 }
adamc@829 987 function ssub(s, start, len) {
adamc@1260 988 return s.substring(start, start+len);
adamc@829 989 }
adam@1624 990 function strlenGe(s, len) {
adam@1624 991 return s.length >= len;
adam@1624 992 }
adamc@821 993
adam@1621 994 function trimZeroes(s) {
adam@1621 995 for (var i = 0; i < s.length; ++i)
adam@1632 996 if (s.charAt(i) != '0') {
adam@1621 997 if (i > 0)
adam@1621 998 return s.substring(i);
adam@1621 999 else
adam@1621 1000 return s;
adam@1621 1001 }
adam@1621 1002
adam@1631 1003 if (s.length == 0)
adam@1621 1004 return s;
adam@1621 1005 else
adam@1631 1006 return "0";
adam@1621 1007 }
adam@1621 1008
adamc@649 1009 function pi(s) {
adam@1631 1010 var st = trimZeroes(s);
adam@1631 1011 var r = parseInt(st);
adam@1631 1012 if (r.toString() == st)
adamc@1260 1013 return r;
adamc@1260 1014 else
adamc@1260 1015 er("Can't parse int: " + s);
adamc@649 1016 }
adamc@649 1017
adamc@649 1018 function pfl(s) {
adamc@1260 1019 var r = parseFloat(s);
adamc@1260 1020 if (r.toString() == s)
adamc@1260 1021 return r;
adamc@1260 1022 else
adamc@1260 1023 er("Can't parse float: " + s);
adamc@649 1024 }
adamc@649 1025
adamc@838 1026 function pio(s) {
adam@1631 1027 var st = trimZeroes(s);
adam@1631 1028 var r = parseInt(st);
adam@1631 1029 if (r.toString() == st)
adamc@1260 1030 return r;
adamc@1260 1031 else
adamc@1260 1032 return null;
adamc@838 1033 }
adamc@838 1034
adamc@838 1035 function pflo(s) {
adamc@1260 1036 var r = parseFloat(s);
adamc@1260 1037 if (r.toString() == s)
adamc@1260 1038 return r;
adamc@1260 1039 else
adamc@1260 1040 return null;
adamc@838 1041 }
adamc@838 1042
adam@1620 1043 function parseSource(s1, s2) {
adam@1620 1044 return eval("s" + s1 + "_" + s2);
adam@1620 1045 }
adam@1620 1046
adamc@692 1047 function uf(s) {
adamc@1260 1048 if (s.length == 0)
adamc@1260 1049 return "_";
adamc@1260 1050 s = s.replace(new RegExp ("\\.", "g"), ".2E");
adamc@1260 1051 return (s.charAt(0) == '_' ? "_" : "") + encodeURIComponent(s).replace(new RegExp ("%", "g"), ".");
adamc@691 1052 }
adamc@691 1053
adamc@692 1054 function uu(s) {
adamc@1260 1055 if (s.length > 0 && s.charAt(0) == '_') {
adamc@1260 1056 s = s.substring(1);
adamc@1260 1057 } else if (s.length >= 3 && (s.charAt(0) == '%' || s.charAt(0) == '.')
adamc@1260 1058 && s.charAt(1) == '5' && (s.charAt(2) == 'f' || s.charAt(2) == 'F'))
adamc@1260 1059 s = s.substring(3);
adamc@1260 1060 s = s.replace(new RegExp ("\\+", "g"), " ");
adamc@1260 1061 s = s.replace(new RegExp ("\\.", "g"), "%");
adamc@1260 1062 return decodeURIComponent(s);
adamc@905 1063 }
adamc@905 1064
adamc@1108 1065 function atr(s) {
adamc@1260 1066 return s.replace(new RegExp ("\"", "g"), "&quot;").replace(new RegExp ("&", "g"), "&amp;")
adamc@1260 1067 }
adamc@1108 1068
adamc@912 1069 function ub(b) {
adamc@1260 1070 return b ? "1" : "0";
adamc@912 1071 }
adamc@912 1072
adamc@905 1073 function uul(getToken, getData) {
adamc@1260 1074 var tok = getToken();
adamc@1260 1075 if (tok == "Nil") {
adamc@1260 1076 return null;
adamc@1260 1077 } else if (tok == "Cons") {
adamc@1260 1078 var d = getData();
adamc@1260 1079 var l = uul(getToken, getData);
adamc@1260 1080 return {_1:d, _2:l};
adamc@1260 1081 } else
adamc@1260 1082 whine("Can't unmarshal list (" + tok + ")");
adamc@692 1083 }
adamc@692 1084
adamc@961 1085 function strcmp(str1, str2) {
adamc@1260 1086 return ((str1 == str2) ? 0 : ((str1 > str2) ? 1 : -1));
adamc@961 1087 }
adamc@692 1088
adamc@603 1089
adamc@692 1090 // Remote calls
adamc@609 1091
adamc@703 1092 var client_id = null;
adamc@668 1093 var client_pass = 0;
adamc@668 1094 var url_prefix = "/";
adamc@673 1095 var timeout = 60;
adam@1552 1096 var isPost = false;
adamc@668 1097
adamc@668 1098 function getXHR(uri)
adamc@609 1099 {
adamc@609 1100 try {
adamc@1260 1101 return new XMLHttpRequest();
adamc@609 1102 } catch (e) {
adamc@1260 1103 try {
adamc@1260 1104 return new ActiveXObject("Msxml2.XMLHTTP");
adamc@1260 1105 } catch (e) {
adamc@1260 1106 try {
adamc@1260 1107 return new ActiveXObject("Microsoft.XMLHTTP");
adamc@1260 1108 } catch (e) {
adamc@1260 1109 whine("Your browser doesn't seem to support AJAX.");
adamc@1260 1110 }
adamc@1260 1111 }
adamc@609 1112 }
adamc@609 1113 }
adamc@609 1114
adamc@736 1115 var sig = null;
adamc@736 1116
adamc@1042 1117 var unloading = false, inFlight = null;
adamc@1042 1118
adamc@1042 1119 function unload() {
adamc@1260 1120 unloading = true;
adamc@1042 1121
adamc@1260 1122 for (; inFlight; inFlight = inFlight.next) {
adamc@1260 1123 inFlight.data.abort();
adamc@1260 1124 }
adamc@1042 1125 }
adamc@1042 1126
adamc@736 1127 function requestUri(xhr, uri, needsSig) {
adamc@1260 1128 if (unloading)
adamc@1260 1129 return;
adamc@1042 1130
adamc@1260 1131 xhr.open("POST", uri, true);
adamc@1260 1132 xhr.setRequestHeader("Content-type", "text/plain");
adam@1549 1133 try {
adam@1549 1134 xhr.setRequestHeader("Content-length", "0");
adam@1549 1135 xhr.setRequestHeader("Connection", "close");
adam@1549 1136 } catch (e) { }
adamc@668 1137
adamc@1260 1138 if (client_id != null) {
adamc@1260 1139 xhr.setRequestHeader("UrWeb-Client", client_id.toString());
adamc@1260 1140 xhr.setRequestHeader("UrWeb-Pass", client_pass.toString());
adamc@1260 1141 }
adamc@668 1142
adamc@1260 1143 if (needsSig) {
adamc@1260 1144 if (sig == null)
adamc@1260 1145 whine("Missing cookie signature!");
adamc@736 1146
adamc@1260 1147 xhr.setRequestHeader("UrWeb-Sig", sig);
adamc@1260 1148 }
adamc@736 1149
adamc@1260 1150 inFlight = cons(xhr, inFlight);
adamc@1260 1151 xhr.send(null);
adamc@668 1152 }
adamc@668 1153
adamc@1042 1154 function xhrFinished(xhr) {
adamc@1260 1155 xhr.abort();
adamc@1260 1156 inFlight = remove(xhr, inFlight);
adamc@1042 1157 }
adamc@1042 1158
adamc@1111 1159 function unurlify(parse, s) {
adamc@1260 1160 return parse(s);
adamc@1111 1161 }
adamc@1111 1162
adam@1385 1163 function redirect(s) {
adam@1385 1164 window.location = s;
adam@1385 1165 }
adam@1385 1166
adamc@978 1167 function rc(prefix, uri, parse, k, needsSig) {
adamc@1260 1168 uri = cat(prefix, uri);
adamc@1260 1169 uri = flattenLocal(uri);
adamc@1260 1170 var xhr = getXHR();
adamc@609 1171
adamc@1260 1172 xhr.onreadystatechange = function() {
adamc@1260 1173 if (xhr.readyState == 4) {
adamc@1260 1174 var isok = false;
adamc@612 1175
adamc@1260 1176 try {
adamc@1260 1177 if (xhr.status == 200)
adamc@1260 1178 isok = true;
adamc@1260 1179 } catch (e) { }
adamc@612 1180
adamc@1260 1181 if (isok) {
adam@1446 1182 var lines = xhr.responseText.split("\n");
adam@1446 1183 if (lines.length != 2)
adam@1446 1184 whine("Bad RPC response lines");
adam@1446 1185
adam@1446 1186 eval(lines[0]);
adam@1446 1187
adamc@1260 1188 try {
adam@1446 1189 k(parse(lines[1]));
adamc@1260 1190 } catch (v) {
adamc@1260 1191 doExn(v);
adamc@1260 1192 }
adamc@1260 1193 } else {
adamc@1260 1194 conn();
adamc@1260 1195 }
adamc@1260 1196
adamc@1260 1197 xhrFinished(xhr);
adamc@729 1198 }
adamc@1260 1199 };
adamc@1042 1200
adamc@1260 1201 requestUri(xhr, uri, needsSig);
adamc@609 1202 }
adamc@667 1203
adamc@667 1204 function path_join(s1, s2) {
adamc@1260 1205 if (s1.length > 0 && s1.charAt(s1.length-1) == '/')
adamc@1260 1206 return s1 + s2;
adamc@1260 1207 else
adamc@1260 1208 return s1 + "/" + s2;
adamc@667 1209 }
adamc@667 1210
adamc@670 1211 var channels = [];
adamc@670 1212
adamc@670 1213 function newQueue() {
adamc@1260 1214 return { front : null, back : null };
adamc@670 1215 }
adamc@670 1216 function enqueue(q, v) {
adamc@1260 1217 if (q.front == null) {
adamc@1260 1218 q.front = cons(v, null);
adamc@1260 1219 q.back = q.front;
adamc@1260 1220 } else {
adamc@1260 1221 var node = cons(v, null);
adamc@1260 1222 q.back.next = node;
adamc@1260 1223 q.back = node;
adamc@1260 1224 }
adamc@670 1225 }
adamc@670 1226 function dequeue(q) {
adamc@670 1227 if (q.front == null)
adamc@1260 1228 return null;
adamc@1260 1229 else {
adamc@1260 1230 var r = q.front.data;
adamc@1260 1231 q.front = q.front.next;
adamc@1260 1232 if (q.front == null)
adamc@1260 1233 q.back = null;
adamc@1260 1234 return r;
adamc@1260 1235 }
adamc@670 1236 }
adamc@670 1237
adamc@670 1238 function newChannel() {
adamc@1260 1239 return { msgs : newQueue(), listeners : newQueue() };
adamc@670 1240 }
adamc@670 1241
adamc@667 1242 function listener() {
adamc@1260 1243 var uri = path_join(url_prefix, ".msgs");
adamc@1260 1244 var xhr = getXHR();
adamc@1260 1245 var tid, orsc, onTimeout;
adamc@673 1246
adamc@1260 1247 var connect = function () {
adamc@1260 1248 xhr.onreadystatechange = orsc;
adamc@1260 1249 tid = window.setTimeout(onTimeout, timeout * 500);
adamc@1260 1250 requestUri(xhr, uri, false);
adamc@1260 1251 }
adamc@673 1252
adamc@1260 1253 orsc = function() {
adamc@1260 1254 if (xhr.readyState == 4) {
adamc@1260 1255 window.clearTimeout(tid);
adamc@673 1256
adamc@1260 1257 var isok = false;
adamc@667 1258
adamc@1260 1259 try {
adamc@1260 1260 if (xhr.status == 200)
adamc@1260 1261 isok = true;
adamc@1260 1262 } catch (e) { }
adamc@667 1263
adamc@1260 1264 if (isok) {
adam@1447 1265 var text = xhr.responseText;
adamc@1260 1266 if (text == "")
adamc@1260 1267 return;
adamc@1260 1268 var lines = text.split("\n");
adamc@889 1269
adam@1552 1270 if (lines.length == 1 && lines[0] == "R") {
adam@1553 1271 lameDuck = true;
adam@1553 1272
adam@1552 1273 if (isPost)
adam@1552 1274 history.back();
adam@1552 1275 else
adam@1552 1276 location.reload();
adam@1552 1277
adam@1552 1278 return;
adam@1552 1279 }
adam@1552 1280
adamc@1260 1281 if (lines.length < 2) {
adamc@1260 1282 discon();
adamc@1260 1283 return;
adamc@1260 1284 }
adamc@1260 1285
adam@1447 1286 var messageReader = function(i) {
adam@1447 1287 if (i+1 >= lines.length) {
adam@1447 1288 xhrFinished(xhr);
adam@1447 1289 connect();
adam@1447 1290 }
adam@1447 1291 else {
adam@1447 1292 var chn = lines[i];
adam@1447 1293 var msg = lines[i+1];
adamc@1260 1294
adam@1447 1295 if (chn == "E") {
adam@1447 1296 eval(msg);
adam@1447 1297 window.setTimeout(function() { messageReader(i+2); }, 0);
adam@1447 1298 } else {
adam@1447 1299 if (chn < 0)
adam@1447 1300 whine("Out-of-bounds channel in message from remote server");
adamc@1260 1301
adam@1447 1302 var ch;
adamc@1260 1303
adam@1447 1304 if (chn >= channels.length || channels[chn] == null) {
adam@1447 1305 ch = newChannel();
adam@1447 1306 channels[chn] = ch;
adam@1447 1307 } else
adam@1447 1308 ch = channels[chn];
adamc@1260 1309
adam@1447 1310 var listener = dequeue(ch.listeners);
adam@1447 1311 if (listener == null) {
adam@1447 1312 enqueue(ch.msgs, msg);
adam@1447 1313 } else {
adam@1447 1314 try {
adam@1447 1315 listener(msg);
adam@1447 1316 } catch (v) {
adam@1447 1317 doExn(v);
adam@1447 1318 }
adam@1447 1319 }
adam@1447 1320
adam@1447 1321 messageReader(i+2);
adamc@1260 1322 }
adamc@1260 1323 }
adamc@1260 1324 }
adamc@1260 1325
adam@1447 1326 messageReader(0);
adamc@1260 1327 }
adamc@1260 1328 else {
adamc@1260 1329 try {
adamc@1260 1330 if (xhr.status != 0)
adamc@1260 1331 servErr("Error querying remote server for messages: " + xhr.status);
adamc@1260 1332 } catch (e) { }
adamc@1260 1333 }
adamc@729 1334 }
adamc@1260 1335 };
adamc@669 1336
adamc@1260 1337 onTimeout = function() {
adamc@1260 1338 xhrFinished(xhr);
adamc@1260 1339 connect();
adamc@1260 1340 };
adamc@670 1341
adamc@673 1342 connect();
adamc@667 1343 }
adamc@670 1344
adamc@670 1345 function rv(chn, parse, k) {
adamc@1260 1346 if (chn == null)
adamc@1260 1347 return;
adamc@682 1348
adamc@1260 1349 if (chn < 0)
adamc@1260 1350 whine("Out-of-bounds channel receive");
adamc@670 1351
adamc@1260 1352 var ch;
adamc@670 1353
adamc@1260 1354 if (chn >= channels.length || channels[chn] == null) {
adamc@1260 1355 ch = newChannel();
adamc@1260 1356 channels[chn] = ch;
adamc@1260 1357 } else
adamc@1260 1358 ch = channels[chn];
adamc@670 1359
adamc@1260 1360 var msg = dequeue(ch.msgs);
adamc@1260 1361 if (msg == null) {
adamc@1260 1362 enqueue(ch.listeners, function(msg) { k(parse(msg)); });
adamc@1260 1363 } else {
adamc@1260 1364 try {
adamc@1260 1365 k(parse(msg));
adamc@1260 1366 } catch (v) {
adamc@1260 1367 doExn(v);
adamc@1260 1368 }
adamc@728 1369 }
adamc@670 1370 }
adamc@693 1371
adamc@978 1372 function sl(ms, k) {
adamc@1260 1373 window.setTimeout(function() { k(null); }, ms);
adamc@1021 1374 }
adamc@1021 1375
adamc@1021 1376 function sp(e) {
adamc@1260 1377 execF(e, null);
adamc@978 1378 }
adamc@978 1379
adamc@693 1380
adamc@970 1381 // The Ur interpreter
adamc@970 1382
adamc@970 1383 var urfuncs = [];
adamc@970 1384
adamc@970 1385 function lookup(env, n) {
adamc@1260 1386 while (env != null) {
adamc@1260 1387 if (n == 0)
adamc@1260 1388 return env.data;
adamc@1260 1389 else {
adamc@1260 1390 --n;
adamc@1260 1391 env = env.next;
adamc@1260 1392 }
adamc@970 1393 }
adamc@970 1394
adamc@1260 1395 whine("Out-of-bounds Ur variable reference");
adamc@970 1396 }
adamc@970 1397
adamc@974 1398 function execP(env, p, v) {
adamc@1260 1399 switch (p.c) {
adamc@1260 1400 case "w":
adamc@1260 1401 return env;
adamc@1260 1402 case "v":
adamc@1260 1403 return cons(v, env);
adamc@1260 1404 case "c":
adamc@1260 1405 if (v == p.v)
adamc@1260 1406 return env;
adamc@1260 1407 else
adamc@1260 1408 return false;
adamc@1260 1409 case "s":
adamc@1260 1410 if (v == null)
adamc@1260 1411 return false;
adamc@1260 1412 else
adamc@1260 1413 return execP(env, p.p, p.n ? v.v : v);
adamc@1260 1414 case "1":
adamc@1260 1415 if (v.n != p.n)
adamc@1260 1416 return false;
adamc@1260 1417 else
adamc@1260 1418 return execP(env, p.p, v.v);
adamc@1260 1419 case "r":
adamc@1260 1420 for (var fs = p.l; fs != null; fs = fs.next) {
adamc@1260 1421 env = execP(env, fs.data.p, v["_" + fs.data.n]);
adamc@1260 1422 if (env == false)
adamc@1260 1423 return false;
adamc@1260 1424 }
adamc@1260 1425 return env;
adamc@1260 1426 default:
adamc@1260 1427 whine("Unknown Ur pattern kind" + p.c);
adamc@974 1428 }
adamc@974 1429 }
adamc@974 1430
adamc@970 1431 function exec0(env, e) {
adamc@1260 1432 return exec1(env, null, e);
adamc@1020 1433 }
adamc@1020 1434
adamc@1020 1435 function exec1(env, stack, e) {
adamc@1260 1436 var stack, usedK = false;
adamc@970 1437
adamc@1260 1438 var saveEnv = function() {
adamc@1260 1439 if (stack.next != null && stack.next.data.c != "<")
adamc@1260 1440 stack = cons({c: "<", env: env}, stack.next);
adamc@1260 1441 else
adamc@1260 1442 stack = stack.next;
adamc@1260 1443 };
adamc@983 1444
adamc@1260 1445 while (true) {
adamc@1260 1446 switch (e.c) {
adamc@1260 1447 case "c":
adamc@1260 1448 var v = e.v;
adamc@1260 1449 if (stack == null)
adamc@1260 1450 return v;
adamc@1260 1451 var fr = stack.data;
adamc@970 1452
adamc@1260 1453 switch (fr.c) {
adamc@1260 1454 case "s":
adamc@1260 1455 e = {c: "c", v: {v: v}};
adamc@1260 1456 stack = stack.next;
adamc@1260 1457 break;
adamc@1260 1458 case "1":
adamc@1260 1459 e = {c: "c", v: {n: fr.n, v: v}};
adamc@1260 1460 stack = stack.next;
adamc@1260 1461 break;
adamc@1260 1462 case "f":
adamc@1260 1463 fr.args[fr.pos++] = v;
adamc@1260 1464 if (fr.a == null) {
adamc@1260 1465 var res;
adamc@1260 1466 stack = stack.next;
adamc@1035 1467
adamc@1260 1468 if (fr.f.apply)
adamc@1260 1469 res = fr.f.apply(null, fr.args);
adamc@1260 1470 else if (fr.args.length == 0)
adamc@1260 1471 res = fr.f();
adamc@1260 1472 else if (fr.args.length == 1)
adamc@1260 1473 res = fr.f(fr.args[0]);
adamc@1260 1474 else if (fr.args.length == 2)
adamc@1260 1475 res = fr.f(fr.args[0], fr.args[1]);
adamc@1260 1476 else if (fr.args.length == 3)
adamc@1260 1477 res = fr.f(fr.args[0], fr.args[1], fr.args[2]);
adamc@1260 1478 else if (fr.args.length == 4)
adamc@1260 1479 res = fr.f(fr.args[0], fr.args[1], fr.args[2], fr.args[3]);
adamc@1260 1480 else if (fr.args.length == 5)
adamc@1260 1481 res = fr.f(fr.args[0], fr.args[1], fr.args[2], fr.args[3], fr.args[4]);
adamc@1260 1482 else
adamc@1260 1483 whine("Native function has " + fr.args.length + " args, but there is no special case for that count.");
adamc@1035 1484
adamc@1260 1485 e = {c: "c", v: res};
adamc@1260 1486 if (usedK) return null;
adamc@1260 1487 } else {
adamc@1260 1488 e = fr.a.data;
adamc@1260 1489 fr.a = fr.a.next;
adamc@1260 1490 }
adamc@1260 1491 break;
adamc@1260 1492 case "a1":
adamc@1260 1493 e = fr.x;
adamc@1260 1494 stack = cons({c: "a2", f: v}, stack.next);
adamc@1260 1495 break;
adamc@1260 1496 case "a2":
adamc@1260 1497 if (fr.f == null)
adamc@1260 1498 whine("Ur: applying null function");
adamc@1260 1499 else if (fr.f.body) {
adamc@1260 1500 saveEnv();
adamc@1260 1501 env = cons(v, fr.f.env);
adamc@1260 1502 e = fr.f.body;
adamc@1260 1503 } else {
adamc@1260 1504 e = {c: "c", v: fr.f(v)};
adamc@1260 1505 stack = stack.next;
adamc@1260 1506 }
adamc@1260 1507 break;
adamc@1260 1508 case "<":
adamc@1260 1509 env = fr.env;
adamc@1260 1510 stack = stack.next;
adamc@1260 1511 break;
adamc@1260 1512 case "r":
adamc@1260 1513 fr.fs["_" + fr.n] = v;
adamc@1260 1514 if (fr.l == null) {
adamc@1260 1515 e = {c: "c", v: fr.fs};
adamc@1260 1516 stack = stack.next;
adamc@1260 1517 } else {
adamc@1260 1518 fr.n = fr.l.data.n;
adamc@1260 1519 e = fr.l.data.v;
adamc@1260 1520 fr.l = fr.l.next;
adamc@1260 1521 }
adamc@1260 1522 break;
adamc@1260 1523 case ".":
adamc@1260 1524 e = {c: "c", v: v["_" + fr.f]};
adamc@1260 1525 stack = stack.next;
adamc@1260 1526 break;
adamc@1260 1527 case ";":
adamc@1260 1528 e = fr.e2;
adamc@1260 1529 stack = stack.next;
adamc@1260 1530 break;
adamc@1260 1531 case "=":
adamc@1260 1532 saveEnv();
adamc@1260 1533 env = cons(v, env);
adamc@1260 1534 e = fr.e2;
adamc@1260 1535 break;
adamc@1260 1536 case "m":
adamc@1260 1537 var ps;
adamc@1260 1538 for (ps = fr.p; ps != null; ps = ps.next) {
adamc@1260 1539 var r = execP(env, ps.data.p, v);
adamc@1260 1540 if (r != false) {
adamc@1260 1541 saveEnv();
adamc@1260 1542 env = r;
adamc@1260 1543 e = ps.data.b;
adamc@1260 1544 break;
adamc@1260 1545 }
adamc@1260 1546 }
adamc@1260 1547 if (ps == null)
adamc@1260 1548 whine("Match failure in Ur interpretation");
adamc@1260 1549 break;
adamc@1260 1550 default:
adamc@1260 1551 whine("Unknown Ur continuation kind " + fr.c);
adamc@1260 1552 }
adamc@1260 1553
adamc@1260 1554 break;
adamc@1260 1555 case "v":
adamc@1260 1556 e = {c: "c", v: lookup(env, e.n)};
adamc@1260 1557 break;
adamc@1260 1558 case "n":
adamc@1260 1559 var idx = e.n;
adamc@1260 1560 e = urfuncs[idx];
adamc@1260 1561 if (e.c == "t")
adamc@1262 1562 e = urfuncs[idx] = eval("(" + e.f + ")");
adamc@1260 1563 break;
adamc@1260 1564 case "s":
adamc@1260 1565 stack = cons({c: "s"}, stack);
adamc@1260 1566 e = e.v;
adamc@1260 1567 break;
adamc@1260 1568 case "1":
adamc@1260 1569 stack = cons({c: "1", n: e.n}, stack);
adamc@1260 1570 e = e.v;
adamc@1260 1571 break;
adamc@1260 1572 case "f":
adamc@1260 1573 if (e.a == null)
adamc@1260 1574 e = {c: "c", v: (eval(e.f))()};
adamc@1260 1575 else {
adamc@1260 1576 var args = [];
adamc@1260 1577 stack = cons({c: "f", f: eval(e.f), args: args, pos: 0, a: e.a.next}, stack);
adamc@1260 1578 if (!e.a.data.c) alert("[2] fr.f = " + e.f + "; 0 = " + e.a.data);
adamc@1260 1579 e = e.a.data;
adamc@1260 1580 }
adamc@1260 1581 break;
adamc@1260 1582 case "l":
adamc@1260 1583 e = {c: "c", v: {env: env, body: e.b}};
adamc@1260 1584 break;
adamc@1260 1585 case "a":
adamc@1260 1586 stack = cons({c: "a1", x: e.x}, stack);
adamc@1260 1587 e = e.f;
adamc@1260 1588 break;
adamc@1260 1589 case "r":
adamc@1260 1590 if (e.l == null)
adamc@1260 1591 whine("Empty Ur record in interpretation");
adamc@1260 1592 var fs = {};
adamc@1260 1593 stack = cons({c: "r", n: e.l.data.n, fs: fs, l: e.l.next}, stack);
adamc@1260 1594 e = e.l.data.v;
adamc@1260 1595 break;
adamc@1260 1596 case ".":
adamc@1260 1597 stack = cons({c: ".", f: e.f}, stack);
adamc@1260 1598 e = e.r;
adamc@1260 1599 break;
adamc@1260 1600 case ";":
adamc@1260 1601 stack = cons({c: ";", e2: e.e2}, stack);
adamc@1260 1602 e = e.e1;
adamc@1260 1603 break;
adamc@1260 1604 case "=":
adamc@1260 1605 stack = cons({c: "=", e2: e.e2}, stack);
adamc@1260 1606 e = e.e1;
adamc@1260 1607 break;
adamc@1260 1608 case "m":
adamc@1260 1609 stack = cons({c: "m", p: e.p}, stack);
adamc@1260 1610 e = e.e;
adamc@1260 1611 break;
adamc@1260 1612 case "e":
adamc@1260 1613 e = {c: "c", v: cs({c: "wc", env: env, body: e.e})};
adamc@1260 1614 break;
adamc@1260 1615 case "wc":
adamc@1260 1616 env = e.env;
adamc@1260 1617 e = e.body;
adamc@1260 1618 break;
adamc@1260 1619 case "K":
adamc@1260 1620 { var savedStack = stack.next, savedEnv = env;
adamc@1260 1621 e = {c: "c", v: function(v) { return exec1(savedEnv, savedStack, {c: "c", v: v}); } };}
adamc@1260 1622 usedK = true;
rmbruijn@1597 1623 break;
adamc@1260 1624 default:
adamc@1260 1625 whine("Unknown Ur expression kind " + e.c);
adamc@970 1626 }
adamc@970 1627 }
adamc@970 1628 }
adamc@970 1629
adamc@976 1630 function execD(e) {
adamc@1260 1631 return exec0(null, e);
adamc@976 1632 }
adamc@976 1633
adamc@970 1634 function exec(e) {
adamc@1260 1635 var r = exec0(null, e);
adamc@970 1636
adamc@1260 1637 if (r != null && r.body != null)
adamc@1260 1638 return function(v) { return exec0(cons(v, r.env), r.body); };
adamc@1260 1639 else
adamc@1260 1640 return r;
adamc@895 1641 }
adamc@895 1642
adamc@977 1643 function execF(f, x) {
adamc@1260 1644 return exec0(cons(x, f.env), f.body);
adamc@977 1645 }
adamc@977 1646
adamc@895 1647
adam@1290 1648 // Wrappers
adam@1290 1649
adam@1290 1650 function confrm(s) {
adam@1290 1651 return confirm(s) ? true : false;
adam@1290 1652 }
adam@1290 1653
adam@1290 1654
adamc@1323 1655 // URL blessing
adamc@1323 1656
adamc@1323 1657 var urlRules = null;
adamc@1323 1658
adamc@1323 1659 function checkUrl(s) {
adamc@1323 1660 for (var r = urlRules; r; r = r.next) {
adamc@1323 1661 var ru = r.data;
adamc@1323 1662 if (ru.prefix ? s.indexOf(ru.pattern) == 0 : s == ru.pattern)
adamc@1323 1663 return ru.allow ? s : null;
adamc@1323 1664 }
adamc@1323 1665
adamc@1323 1666 return null;
adamc@1323 1667 }
adamc@1323 1668
adamc@1323 1669 function bless(s) {
adamc@1323 1670 u = checkUrl(s);
adamc@1323 1671 if (u == null)
adamc@1323 1672 er("Disallowed URL: " + s);
adamc@1323 1673 return u;
adamc@1323 1674 }
adamc@1323 1675
adam@1556 1676
adam@1556 1677 // ID generation
adam@1556 1678
adam@1556 1679 var nextId = 0;
adam@1556 1680
adam@1556 1681 function fresh() {
adam@1556 1682 return (--nextId).toString();
adam@1556 1683 }
adam@1556 1684
rmbruijn@1597 1685
adamc@693 1686 // App-specific code