src/selector.js

   1 /*
   2  * Sizzle CSS Selector Engine - v0.9
   3  *  Copyright 2009, John Resig (http://ejohn.org/)
   4  *  released under the MIT License
   5  */
   6 (function(){
   7
   8 var chunker = /((?:\((?:\([^()]+\)|[^()]+)+\)|\[(?:\[[^[\]]+\]|[^[\]]+)+\]|\\.|[^ >+~,(\[]+)+|[>+~])(\s*,\s*)?/g;
   9
  10 var done = 0;
  11
  12 var Sizzle = function(selector, context, results, seed) {
  13         results = results || [];
  14         context = context || document;
  15
  16         if ( context.nodeType !== 1 && context.nodeType !== 9 )
  17                 return [];
  18
  19         if ( !selector || typeof selector !== "string" ) {
  20                 return results;
  21         }
  22
  23         var parts = [], m, set, checkSet, check, mode, extra;
  24
  25         // Reset the position of the chunker regexp (start from head)
  26         chunker.lastIndex = 0;
  27
  28         while ( (m = chunker.exec(selector)) !== null ) {
  29                 parts.push( m[1] );
  30
  31                 if ( m[2] ) {
  32                         extra = RegExp.rightContext;
  33                         break;
  34                 }
  35         }
  36
  37         if ( parts.length > 1 && Expr.match.POS.exec( selector ) ) {
  38                 if ( parts.length === 2 && Expr.relative[ parts[0] ] ) {
  39                         var later = "", match;
  40
  41                         // Position selectors must be done after the filter
  42                         while ( (match = Expr.match.POS.exec( selector )) ) {
  43                                 later += match[0];
  44                                 selector = selector.replace( Expr.match.POS, "" );
  45                         }
  46
  47                         set = Sizzle.filter( later, Sizzle( selector, context ) );
  48                 } else {
  49                         set = Expr.relative[ parts[0] ] ?
  50                                 [ context ] :
  51                                 Sizzle( parts.shift(), context );
  52
  53                         while ( parts.length ) {
  54                                 var tmpSet = [];
  55
  56                                 selector = parts.shift();
  57                                 if ( Expr.relative[ selector ] )
  58                                         selector += parts.shift();
  59
  60                                 for ( var i = 0, l = set.length; i < l; i++ ) {
  61                                         Sizzle( selector, set[i], tmpSet );
  62                                 }
  63
  64                                 set = tmpSet;
  65                         }
  66                 }
  67         } else {
  68                 var ret = seed ?
  69                         { expr: parts.pop(), set: makeArray(seed) } :
  70                         Sizzle.find( parts.pop(), parts.length === 1 && context.parentNode ? context.parentNode : context );
  71                 set = Sizzle.filter( ret.expr, ret.set );
  72
  73                 if ( parts.length > 0 ) {
  74                         checkSet = makeArray(set);
  75                 }
  76
  77                 while ( parts.length ) {
  78                         var cur = parts.pop(), pop = cur;
  79
  80                         if ( !Expr.relative[ cur ] ) {
  81                                 cur = "";
  82                         } else {
  83                                 pop = parts.pop();
  84                         }
  85
  86                         if ( pop == null ) {
  87                                 pop = context;
  88                         }
  89
  90                         Expr.relative[ cur ]( checkSet, pop );
  91                 }
  92         }
  93
  94         if ( !checkSet ) {
  95                 checkSet = set;
  96         }
  97
  98         if ( !checkSet ) {
  99                 throw "Syntax error, unrecognized expression: " + (cur || selector);
 100         }
 101
 102         if ( checkSet instanceof Array ) {
 103                 if ( context.nodeType === 1 ) {
 104                         for ( var i = 0; checkSet[i] != null; i++ ) {
 105                                 if ( checkSet[i] && (checkSet[i] === true || checkSet[i].nodeType === 1 && contains(context, checkSet[i])) ) {
 106                                         results.push( set[i] );
 107                                 }
 108                         }
 109                 } else {
 110                         for ( var i = 0; checkSet[i] != null; i++ ) {
 111                                 if ( checkSet[i] && checkSet[i].nodeType === 1 ) {
 112                                         results.push( set[i] );
 113                                 }
 114                         }
 115                 }
 116         } else {
 117                 makeArray( checkSet, results );
 118         }
 119
 120         if ( extra ) {
 121                 Sizzle( extra, context, results );
 122         }
 123
 124         return results;
 125 };
 126
 127 Sizzle.matches = function(expr, set){
 128         return Sizzle(expr, null, null, set);
 129 };
 130
 131 Sizzle.find = function(expr, context){
 132         var set, match;
 133
 134         if ( !expr ) {
 135                 return [];
 136         }
 137
 138         var later = "", match;
 139
 140         // Pseudo-selectors could contain other selectors (like :not)
 141         while ( (match = Expr.match.PSEUDO.exec( expr )) ) {
 142                 var left = RegExp.leftContext;
 143
 144                 if ( left.substr( left.length - 1 ) !== "\\" ) {
 145                         later += match[0];
 146                         expr = expr.replace( Expr.match.PSEUDO, "" );
 147                 } else {
 148                         // TODO: Need a better solution, fails: .class\:foo:realfoo(#id)
 149                         break;
 150                 }
 151         }
 152
 153         for ( var i = 0, l = Expr.order.length; i < l; i++ ) {
 154                 var type = Expr.order[i];
 155
 156                 if ( (match = Expr.match[ type ].exec( expr )) ) {
 157                         var left = RegExp.leftContext;
 158
 159                         if ( left.substr( left.length - 1 ) !== "\\" ) {
 160                                 match[1] = (match[1] || "").replace(/\\/g, "");
 161                                 set = Expr.find[ type ]( match, context );
 162
 163                                 if ( set != null ) {
 164                                         expr = expr.replace( Expr.match[ type ], "" );
 165                                         break;
 166                                 }
 167                         }
 168                 }
 169         }
 170
 171         if ( !set ) {
 172                 set = context.getElementsByTagName("*");
 173         }
 174
 175         expr += later;
 176
 177         return {set: set, expr: expr};
 178 };
 179
 180 Sizzle.filter = function(expr, set, inplace){
 181         var old = expr, result = [], curLoop = set, match;
 182
 183         while ( expr && set.length ) {
 184                 for ( var type in Expr.filter ) {
 185                         if ( (match = Expr.match[ type ].exec( expr )) != null ) {
 186                                 var anyFound = false, filter = Expr.filter[ type ], goodArray = null;
 187
 188                                 if ( curLoop == result ) {
 189                                         result = [];
 190                                 }
 191
 192                                 if ( Expr.preFilter[ type ] ) {
 193                                         match = Expr.preFilter[ type ]( match, curLoop );
 194
 195                                         if ( match[0] === true ) {
 196                                                 goodArray = [];
 197                                                 var last = null, elem;
 198                                                 for ( var i = 0; (elem = curLoop[i]) !== undefined; i++ ) {
 199                                                         if ( elem && last !== elem ) {
 200                                                                 goodArray.push( elem );
 201                                                                 last = elem;
 202                                                         }
 203                                                 }
 204                                         }
 205
 206                                 }
 207
 208                                 var goodPos = 0, found, item;
 209
 210                                 for ( var i = 0; (item = curLoop[i]) !== undefined; i++ ) {
 211                                         if ( item ) {
 212                                                 if ( goodArray && item != goodArray[goodPos] ) {
 213                                                         goodPos++;
 214                                                 }
 215
 216                                                 found = filter( item, match, goodPos, goodArray );
 217                                                 if ( inplace && found != null ) {
 218                                                         curLoop[i] = found ? curLoop[i] : false;
 219                                                         if ( found ) {
 220                                                                 anyFound = true;
 221                                                         }
 222                                                 } else if ( found ) {
 223                                                         result.push( item );
 224                                                         anyFound = true;
 225                                                 }
 226                                         }
 227                                 }
 228
 229                                 if ( found !== undefined ) {
 230                                         if ( !inplace ) {
 231                                                 curLoop = result;
 232                                         }
 233
 234                                         expr = expr.replace( Expr.match[ type ], "" );
 235
 236                                         if ( !anyFound ) {
 237                                                 return [];
 238                                         }
 239
 240                                         break;
 241                                 }
 242                         }
 243                 }
 244
 245
 246                 expr = expr.replace(/\s*,\s*/, "");
 247
 248                 // Improper expression
 249                 if ( expr == old ) {
 250                         throw "Syntax error, unrecognized expression: " + expr;
 251                 }
 252
 253                 old = expr;
 254         }
 255
 256         return curLoop;
 257 };
 258
 259 var Expr = Sizzle.selectors = {
 260         order: [ "ID", "NAME", "TAG" ],
 261         match: {
 262                 ID: /#((?:[\w\u0128-\uFFFF_-]|\\.)+)/,
 263                 CLASS: /\.((?:[\w\u0128-\uFFFF_-]|\\.)+)/,
 264                 NAME: /\[name=((?:[\w\u0128-\uFFFF_-]|\\.)+)\]/,
 265                 ATTR: /\[((?:[\w\u0128-\uFFFF_-]|\\.)+)\s*(?:(\S{0,1}=)\s*(['"]*)(.*?)\3|)\]/,
 266                 TAG: /^((?:[\w\u0128-\uFFFF\*_-]|\\.)+)/,
 267                 CHILD: /:(only|nth|last|first)-child\(?(even|odd|[\dn+-]*)\)?/,
 268                 POS: /:(nth|eq|gt|lt|first|last|even|odd)\(?(\d*)\)?(?:[^-]|$)/,
 269                 PSEUDO: /:((?:[\w\u0128-\uFFFF_-]|\\.)+)(?:\((['"]*)((?:\([^\)]+\)|[^\2\(\)]*)+)\2\))?/
 270         },
 271         attrMap: {
 272                 "class": "className"
 273         },
 274         relative: {
 275                 "+": function(checkSet, part){
 276                         for ( var i = 0, l = checkSet.length; i < l; i++ ) {
 277                                 var elem = checkSet[i];
 278                                 if ( elem ) {
 279                                         var cur = elem.previousSibling;
 280                                         while ( cur && cur.nodeType !== 1 ) {
 281                                                 cur = cur.previousSibling;
 282                                         }
 283                                         checkSet[i] = typeof part === "string" ?
 284                                                 cur || false :
 285                                                 cur === part;
 286                                 }
 287                         }
 288
 289                         if ( typeof part === "string" ) {
 290                                 Sizzle.filter( part, checkSet, true );
 291                         }
 292                 },
 293                 ">": function(checkSet, part){
 294                         if ( typeof part === "string" && !/\W/.test(part) ) {
 295                                 part = part.toUpperCase();
 296
 297                                 for ( var i = 0, l = checkSet.length; i < l; i++ ) {
 298                                         var elem = checkSet[i];
 299                                         if ( elem ) {
 300                                                 var parent = elem.parentNode;
 301                                                 checkSet[i] = parent.nodeName === part ? parent : false;
 302                                         }
 303                                 }
 304                         } else {
 305                                 for ( var i = 0, l = checkSet.length; i < l; i++ ) {
 306                                         var elem = checkSet[i];
 307                                         if ( elem ) {
 308                                                 checkSet[i] = typeof part === "string" ?
 309                                                         elem.parentNode :
 310                                                         elem.parentNode === part;
 311                                         }
 312                                 }
 313
 314                                 if ( typeof part === "string" ) {
 315                                         Sizzle.filter( part, checkSet, true );
 316                                 }
 317                         }
 318                 },
 319                 "": function(checkSet, part){
 320                         var doneName = "done" + (done++), checkFn = dirCheck;
 321
 322                         if ( !part.match(/\W/) ) {
 323                                 var nodeCheck = part = part.toUpperCase();
 324                                 checkFn = dirNodeCheck;
 325                         }
 326
 327                         checkFn("parentNode", part, doneName, checkSet, nodeCheck);
 328                 },
 329                 "~": function(checkSet, part){
 330                         var doneName = "done" + (done++), checkFn = dirCheck;
 331
 332                         if ( typeof part === "string" && !part.match(/\W/) ) {
 333                                 var nodeCheck = part = part.toUpperCase();
 334                                 checkFn = dirNodeCheck;
 335                         }
 336
 337                         checkFn("previousSibling", part, doneName, checkSet, nodeCheck);
 338                 }
 339         },
 340         find: {
 341                 ID: function(match, context){
 342                         if ( context.getElementById ) {
 343                                 var m = context.getElementById(match[1]);
 344                                 return m ? [m] : [];
 345                         }
 346                 },
 347                 NAME: function(match, context){
 348                         return context.getElementsByName(match[1]);
 349                 },
 350                 TAG: function(match, context){
 351                         return context.getElementsByTagName(match[1]);
 352                 }
 353         },
 354         preFilter: {
 355                 CLASS: function(match){
 356                         return new RegExp( "(?:^|\\s)" + match[1] + "(?:\\s|$)" );
 357                 },
 358                 ID: function(match){
 359                         return match[1];
 360                 },
 361                 TAG: function(match){
 362                         return match[1].toUpperCase();
 363                 },
 364                 CHILD: function(match){
 365                         if ( match[1] == "nth" ) {
 366                                 // parse equations like 'even', 'odd', '5', '2n', '3n+2', '4n-1', '-n+6'
 367                                 var test = /(-?)(\d*)n((?:\+|-)?\d*)/.exec(
 368                                         match[2] == "even" && "2n" || match[2] == "odd" && "2n+1" ||
 369                                         !/\D/.test( match[2] ) && "0n+" + match[2] || match[2]);
 370
 371                                 // calculate the numbers (first)n+(last) including if they are negative
 372                                 match[2] = (test[1] + (test[2] || 1)) - 0;
 373                                 match[3] = test[3] - 0;
 374                         }
 375
 376                         // TODO: Move to normal caching system
 377                         match[0] = "done" + (done++);
 378
 379                         return match;
 380                 },
 381                 ATTR: function(match){
 382                         var name = match[1];
 383
 384                         if ( Expr.attrMap[name] ) {
 385                                 match[1] = Expr.attrMap[name];
 386                         }
 387
 388                         if ( match[2] === "~=" ) {
 389                                 match[4] = " " + match[4] + " ";
 390                         }
 391
 392                         return match;
 393                 },
 394                 PSEUDO: function(match){
 395                         if ( match[1] === "not" ) {
 396                                 match[3] = match[3].split(/\s*,\s*/);
 397                         }
 398
 399                         return match;
 400                 },
 401                 POS: function(match){
 402                         match.unshift( true );
 403                         return match;
 404                 }
 405         },
 406         filters: {
 407                 enabled: function(elem){
 408                         return elem.disabled === false && elem.type !== "hidden";
 409                 },
 410                 disabled: function(elem){
 411                         return elem.disabled === true;
 412                 },
 413                 checked: function(elem){
 414                         return elem.checked === true;
 415                 },
 416                 selected: function(elem){
 417                         // Accessing this property makes selected-by-default
 418                         // options in Safari work properly
 419                         elem.parentNode.selectedIndex;
 420                         return elem.selected === true;
 421                 },
 422                 parent: function(elem){
 423                         return !!elem.firstChild;
 424                 },
 425                 empty: function(elem){
 426                         return !elem.firstChild;
 427                 },
 428                 has: function(elem, i, match){
 429                         return !!Sizzle( match[3], elem ).length;
 430                 },
 431                 header: function(elem){
 432                         return /h\d/i.test( elem.nodeName );
 433                 },
 434                 text: function(elem){
 435                         return "text" === elem.type;
 436                 },
 437                 radio: function(elem){
 438                         return "radio" === elem.type;
 439                 },
 440                 checkbox: function(elem){
 441                         return "checkbox" === elem.type;
 442                 },
 443                 file: function(elem){
 444                         return "file" === elem.type;
 445                 },
 446                 password: function(elem){
 447                         return "password" === elem.type;
 448                 },
 449                 submit: function(elem){
 450                         return "submit" === elem.type;
 451                 },
 452                 image: function(elem){
 453                         return "image" === elem.type;
 454                 },
 455                 reset: function(elem){
 456                         return "reset" === elem.type;
 457                 },
 458                 button: function(elem){
 459                         return "button" === elem.type || elem.nodeName.toUpperCase() === "BUTTON";
 460                 },
 461                 input: function(elem){
 462                         return /input|select|textarea|button/i.test(elem.nodeName);
 463                 }
 464         },
 465         setFilters: {
 466                 first: function(elem, i){
 467                         return i === 0;
 468                 },
 469                 last: function(elem, i, match, array){
 470                         return i === array.length - 1;
 471                 },
 472                 even: function(elem, i){
 473                         return i % 2 === 0;
 474                 },
 475                 odd: function(elem, i){
 476                         return i % 2 === 1;
 477                 },
 478                 lt: function(elem, i, match){
 479                         return i < match[3] - 0;
 480                 },
 481                 gt: function(elem, i, match){
 482                         return i > match[3] - 0;
 483                 },
 484                 nth: function(elem, i, match){
 485                         return match[3] - 0 == i;
 486                 },
 487                 eq: function(elem, i, match){
 488                         return match[3] - 0 == i;
 489                 }
 490         },
 491         filter: {
 492                 CHILD: function(elem, match){
 493                         var type = match[1], parent = elem.parentNode;
 494
 495                         var doneName = match[0];
 496
 497                         if ( parent && !parent[ doneName ] ) {
 498                                 var count = 1;
 499
 500                                 for ( var node = parent.firstChild; node; node = node.nextSibling ) {
 501                                         if ( node.nodeType == 1 ) {
 502                                                 node.nodeIndex = count++;
 503                                         }
 504                                 }
 505
 506                                 parent[ doneName ] = count - 1;
 507                         }
 508
 509                         if ( type == "first" ) {
 510                                 return elem.nodeIndex == 1;
 511                         } else if ( type == "last" ) {
 512                                 return elem.nodeIndex == parent[ doneName ];
 513                         } else if ( type == "only" ) {
 514                                 return parent[ doneName ] == 1;
 515                         } else if ( type == "nth" ) {
 516                                 var add = false, first = match[2], last = match[3];
 517
 518                                 if ( first == 1 && last == 0 ) {
 519                                         return true;
 520                                 }
 521
 522                                 if ( first == 0 ) {
 523                                         if ( elem.nodeIndex == last ) {
 524                                                 add = true;
 525                                         }
 526                                 } else if ( (elem.nodeIndex - last) % first == 0 && (elem.nodeIndex - last) / first >= 0 ) {
 527                                         add = true;
 528                                 }
 529
 530                                 return add;
 531                         }
 532                 },
 533                 PSEUDO: function(elem, match, i, array){
 534                         var name = match[1], filter = Expr.filters[ name ];
 535
 536                         if ( filter ) {
 537                                 return filter( elem, i, match, array )
 538                         } else if ( name === "contains" ) {
 539                                 return (elem.textContent || elem.innerText || "").indexOf(match[3]) >= 0;
 540                         } else if ( name === "not" ) {
 541                                 var not = match[3];
 542
 543                                 for ( var i = 0, l = not.length; i < l; i++ ) {
 544                                         if ( Sizzle.filter(not[i], [elem]).length > 0 ) {
 545                                                 return false;
 546                                         }
 547                                 }
 548
 549                                 return true;
 550                         }
 551                 },
 552                 ID: function(elem, match){
 553                         return elem.nodeType === 1 && elem.getAttribute("id") === match;
 554                 },
 555                 TAG: function(elem, match){
 556                         return (match === "*" && elem.nodeType === 1) || elem.nodeName === match;
 557                 },
 558                 CLASS: function(elem, match){
 559                         return match.test( elem.className );
 560                 },
 561                 ATTR: function(elem, match){
 562                         var result = elem[ match[1] ] || elem.getAttribute( match[1] ), value = result + "", type = match[2], check = match[4];
 563                         return result == null ?
 564                                 false :
 565                                 type === "=" ?
 566                                 value === check :
 567                                 type === "*=" ?
 568                                 value.indexOf(check) >= 0 :
 569                                 type === "~=" ?
 570                                 (" " + value + " ").indexOf(check) >= 0 :
 571                                 !match[4] ?
 572                                 result :
 573                                 type === "!=" ?
 574                                 value != check :
 575                                 type === "^=" ?
 576                                 value.indexOf(check) === 0 :
 577                                 type === "$=" ?
 578                                 value.substr(value.length - check.length) === check :
 579                                 type === "|=" ?
 580                                 value === check || value.substr(0, check.length + 1) === check + "-" :
 581                                 false;
 582                 },
 583                 POS: function(elem, match, i, array){
 584                         var name = match[2], filter = Expr.setFilters[ name ];
 585
 586                         if ( filter ) {
 587                                 return filter( elem, i, match, array );
 588                         }
 589                 }
 590         }
 591 };
 592
 593 var makeArray = function(array, results) {
 594         array = Array.prototype.slice.call( array );
 595
 596         if ( results ) {
 597                 results.push.apply( results, array );
 598                 return results;
 599         }
 600
 601         return array;
 602 };
 603
 604 // Perform a simple check to determine if the browser is capable of
 605 // converting a NodeList to an array using builtin methods.
 606 try {
 607         Array.prototype.slice.call( document.documentElement.childNodes );
 608
 609 // Provide a fallback method if it does not work
 610 } catch(e){
 611         makeArray = function(array, results) {
 612                 var ret = results || [];
 613
 614                 if ( array instanceof Array ) {
 615                         Array.prototype.push.apply( ret, array );
 616                 } else {
 617                         if ( typeof array.length === "number" ) {
 618                                 for ( var i = 0, l = array.length; i < l; i++ ) {
 619                                         ret.push( array[i] );
 620                                 }
 621                         } else {
 622                                 for ( var i = 0; array[i]; i++ ) {
 623                                         ret.push( array[i] );
 624                                 }
 625                         }
 626                 }
 627
 628                 return ret;
 629         };
 630 }
 631
 632 // Check to see if the browser returns elements by name when
 633 // querying by getElementById (and provide a workaround)
 634 (function(){
 635         // We're going to inject a fake input element with a specified name
 636         var form = document.createElement("form"),
 637                 id = "script" + (new Date).getTime();
 638         form.innerHTML = "<input name='" + id + "'/>";
 639
 640         // Inject it into the root element, check its status, and remove it quickly
 641         var root = document.documentElement;
 642         root.insertBefore( form, root.firstChild );
 643
 644         // The workaround has to do additional checks after a getElementById
 645         // Which slows things down for other browsers (hence the branching)
 646         if ( !!document.getElementById( id ) ) {
 647                 Expr.find.ID = function(match, context){
 648                         if ( context.getElementById ) {
 649                                 var m = context.getElementById(match[1]);
 650                                 return m ? m.id === match[1] || m.getAttributeNode && m.getAttributeNode("id").nodeValue === match[1] ? [m] : undefined : [];
 651                         }
 652                 };
 653
 654                 Expr.filter.ID = function(elem, match){
 655                         var node = elem.getAttributeNode && elem.getAttributeNode("id");
 656                         return elem.nodeType === 1 && node && node.nodeValue === match;
 657                 };
 658         }
 659
 660         root.removeChild( form );
 661 })();
 662
 663 // Check to see if the browser returns only elements
 664 // when doing getElementsByTagName("*")
 665 (function(){
 666         // Create a fake element
 667         var div = document.createElement("div");
 668         div.appendChild( document.createComment("") );
 669
 670         // Make sure no comments are found
 671         if ( div.getElementsByTagName("*").length > 0 ) {
 672                 Expr.find.TAG = function(match, context){
 673                         var results = context.getElementsByTagName(match[1]);
 674
 675                         // Filter out possible comments
 676                         if ( match[1] === "*" ) {
 677                                 var tmp = [];
 678
 679                                 for ( var i = 0; results[i]; i++ ) {
 680                                         if ( results[i].nodeType === 1 ) {
 681                                                 tmp.push( results[i] );
 682                                         }
 683                                 }
 684
 685                                 results = tmp;
 686                         }
 687
 688                         return results;
 689                 };
 690         }
 691 })();
 692
 693 if ( document.querySelectorAll ) (function(){
 694         var oldSizzle = Sizzle;
 695
 696         Sizzle = function(query, context, extra){
 697                 context = context || document;
 698
 699                 if ( context.nodeType === 9 ) {
 700                         try {
 701                                 return makeArray( context.querySelectorAll(query) );
 702                         } catch(e){}
 703                 }
 704
 705                 return oldSizzle(query, context, extra);
 706         };
 707
 708         Sizzle.find = oldSizzle.find;
 709         Sizzle.filter = oldSizzle.filter;
 710         Sizzle.selectors = oldSizzle.selectors;
 711 })();
 712
 713 if ( document.documentElement.getElementsByClassName ) {
 714         Expr.order.splice(1, 0, "CLASS");
 715         Expr.find.CLASS = function(match, context) {
 716                 return context.getElementsByClassName(match[1]);
 717         };
 718 }
 719
 720 function dirNodeCheck( dir, cur, doneName, checkSet, nodeCheck ) {
 721         for ( var i = 0, l = checkSet.length; i < l; i++ ) {
 722                 var elem = checkSet[i];
 723                 if ( elem ) {
 724                         elem = elem[dir]
 725                         var match = false;
 726
 727                         while ( elem && elem.nodeType ) {
 728                                 var done = elem[doneName];
 729                                 if ( done ) {
 730                                         match = checkSet[ done ];
 731                                         break;
 732                                 }
 733
 734                                 if ( elem.nodeType === 1 )
 735                                         elem[doneName] = i;
 736
 737                                 if ( elem.nodeName === cur ) {
 738                                         match = elem;
 739                                         break;
 740                                 }
 741
 742                                 elem = elem[dir];
 743                         }
 744
 745                         checkSet[i] = match;
 746                 }
 747         }
 748 }
 749
 750 function dirCheck( dir, cur, doneName, checkSet, nodeCheck ) {
 751         for ( var i = 0, l = checkSet.length; i < l; i++ ) {
 752                 var elem = checkSet[i];
 753                 if ( elem ) {
 754                         elem = elem[dir]
 755                         var match = false;
 756
 757                         while ( elem && elem.nodeType ) {
 758                                 if ( elem[doneName] ) {
 759                                         match = checkSet[ elem[doneName] ];
 760                                         break;
 761                                 }
 762
 763                                 if ( elem.nodeType === 1 ) {
 764                                         elem[doneName] = i;
 765
 766                                         if ( typeof cur !== "string" ) {
 767                                                 if ( elem === cur ) {
 768                                                         match = true;
 769                                                         break;
 770                                                 }
 771
 772                                         } else if ( Sizzle.filter( cur, [elem] ).length > 0 ) {
 773                                                 match = elem;
 774                                                 break;
 775                                         }
 776                                 }
 777
 778                                 elem = elem[dir];
 779                         }
 780
 781                         checkSet[i] = match;
 782                 }
 783         }
 784 }
 785
 786 var contains = document.compareDocumentPosition ?  function(a, b){
 787         return a.compareDocumentPosition(b) & 16;
 788 } : function(a, b){
 789         return a !== b && a.contains(b);
 790 };
 791
 792 // EXPOSE
 793 jQuery.find = Sizzle;
 794 jQuery.filter = Sizzle.filter;
 795 jQuery.expr = Sizzle.selectors;
 796 jQuery.expr[":"] = jQuery.expr.filters;
 797
 798 Sizzle.selectors.filters.hidden = function(elem){
 799         return "hidden" === elem.type ||
 800                 jQuery.css(elem, "display") === "none" ||
 801                 jQuery.css(elem, "visibility") === "hidden";
 802 };
 803
 804 Sizzle.selectors.filters.visible = function(elem){
 805         return "hidden" !== elem.type &&
 806                 jQuery.css(elem, "display") !== "none" &&
 807                 jQuery.css(elem, "visibility") !== "hidden";
 808 };
 809
 810 jQuery.multiFilter = function( expr, elems, not ) {
 811         if ( not ) {
 812                 return jQuery.multiFilter( ":not(" + expr + ")", elems );
 813         }
 814
 815         var exprs = expr.split(/\s*,\s*/), cur = [];
 816
 817         for ( var i = 0; i < exprs.length; i++ ) {
 818                 cur = jQuery.merge( cur, jQuery.filter( exprs[i], elems ) );
 819         }
 820
 821         return cur;
 822 };
 823
 824 jQuery.dir = function( elem, dir ){
 825         var matched = [], cur = elem[dir];
 826         while ( cur && cur != document ) {
 827                 if ( cur.nodeType == 1 )
 828                         matched.push( cur );
 829                 cur = cur[dir];
 830         }
 831         return matched;
 832 };
 833
 834 jQuery.nth = function(cur, result, dir, elem){
 835         result = result || 1;
 836         var num = 0;
 837
 838         for ( ; cur; cur = cur[dir] )
 839                 if ( cur.nodeType == 1 && ++num == result )
 840                         break;
 841
 842         return cur;
 843 };
 844
 845 jQuery.sibling = function(n, elem){
 846         var r = [];
 847
 848         for ( ; n; n = n.nextSibling ) {
 849                 if ( n.nodeType == 1 && n != elem )
 850                         r.push( n );
 851         }
 852
 853         return r;
 854 };
 855
 856 return;
 857
 858 window.Sizzle = Sizzle;
 859
 860 })();