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         var doCache = !results;
  14         results = results || [];
  15         context = context || document;
  16
  17         if ( context.nodeType !== 1 && context.nodeType !== 9 )
  18                 return [];
  19
  20         if ( !selector || typeof selector !== "string" ) {
  21                 return results;
  22         }
  23
  24         var parts = [], m, set, checkSet, check, mode, extra;
  25
  26         // Reset the position of the chunker regexp (start from head)
  27         chunker.lastIndex = 0;
  28
  29         while ( (m = chunker.exec(selector)) !== null ) {
  30                 parts.push( m[1] );
  31
  32                 if ( m[2] ) {
  33                         extra = RegExp.rightContext;
  34                         break;
  35                 }
  36         }
  37
  38         if ( parts.length > 1 && Expr.match.POS.exec( selector ) ) {
  39                 if ( parts.length === 2 && Expr.relative[ parts[0] ] ) {
  40                         var later = "", match;
  41
  42                         // Position selectors must be done after the filter
  43                         while ( (match = Expr.match.POS.exec( selector )) ) {
  44                                 later += match[0];
  45                                 selector = selector.replace( Expr.match.POS, "" );
  46                         }
  47
  48                         set = Sizzle.filter( later, Sizzle( selector, context ) );
  49                 } else {
  50                         set = Expr.relative[ parts[0] ] ?
  51                                 [ context ] :
  52                                 Sizzle( parts.shift(), context );
  53
  54                         while ( parts.length ) {
  55                                 var tmpSet = [];
  56
  57                                 selector = parts.shift();
  58                                 if ( Expr.relative[ selector ] )
  59                                         selector += parts.shift();
  60
  61                                 for ( var i = 0, l = set.length; i < l; i++ ) {
  62                                         Sizzle( selector, set[i], tmpSet );
  63                                 }
  64
  65                                 set = tmpSet;
  66                         }
  67                 }
  68         } else {
  69                 var ret = seed ?
  70                         { expr: parts.pop(), set: makeArray(seed) } :
  71                         Sizzle.find( parts.pop(), parts.length === 1 && context.parentNode ? context.parentNode : context );
  72                 set = Sizzle.filter( ret.expr, ret.set );
  73
  74                 if ( parts.length > 0 ) {
  75                         checkSet = makeArray(set);
  76                 }
  77
  78                 while ( parts.length ) {
  79                         var cur = parts.pop(), pop = cur;
  80
  81                         if ( !Expr.relative[ cur ] ) {
  82                                 cur = "";
  83                         } else {
  84                                 pop = parts.pop();
  85                         }
  86
  87                         if ( pop == null ) {
  88                                 pop = context;
  89                         }
  90
  91                         Expr.relative[ cur ]( checkSet, pop );
  92                 }
  93         }
  94
  95         if ( !checkSet ) {
  96                 checkSet = set;
  97         }
  98
  99         if ( !checkSet ) {
 100                 throw "Syntax error, unrecognized expression: " + (cur || selector);
 101         }
 102
 103         if ( checkSet instanceof Array ) {
 104                 if ( context.nodeType === 1 ) {
 105                         for ( var i = 0; checkSet[i] != null; i++ ) {
 106                                 if ( checkSet[i] && (checkSet[i] === true || checkSet[i].nodeType === 1 && contains(context, checkSet[i])) ) {
 107                                         results.push( set[i] );
 108                                 }
 109                         }
 110                 } else {
 111                         for ( var i = 0; checkSet[i] != null; i++ ) {
 112                                 if ( checkSet[i] && checkSet[i].nodeType === 1 ) {
 113                                         results.push( set[i] );
 114                                 }
 115                         }
 116                 }
 117         } else {
 118                 makeArray( checkSet, results );
 119         }
 120
 121         if ( extra ) {
 122                 Sizzle( extra, context, results );
 123         }
 124
 125         return results;
 126 };
 127
 128 Sizzle.matches = function(expr, set){
 129         return Sizzle(expr, null, null, set);
 130 };
 131
 132 Sizzle.find = function(expr, context){
 133         var set, match;
 134
 135         if ( !expr ) {
 136                 return [];
 137         }
 138
 139         var later = "", match;
 140
 141         // Pseudo-selectors could contain other selectors (like :not)
 142         while ( (match = Expr.match.PSEUDO.exec( expr )) ) {
 143                 var left = RegExp.leftContext;
 144
 145                 if ( left.substr( left.length - 1 ) !== "\\" ) {
 146                         later += match[0];
 147                         expr = expr.replace( Expr.match.PSEUDO, "" );
 148                 } else {
 149                         // TODO: Need a better solution, fails: .class\:foo:realfoo(#id)
 150                         break;
 151                 }
 152         }
 153
 154         for ( var i = 0, l = Expr.order.length; i < l; i++ ) {
 155                 var type = Expr.order[i];
 156
 157                 if ( (match = Expr.match[ type ].exec( expr )) ) {
 158                         var left = RegExp.leftContext;
 159
 160                         if ( left.substr( left.length - 1 ) !== "\\" ) {
 161                                 match[1] = (match[1] || "").replace(/\\/g, "");
 162                                 set = Expr.find[ type ]( match, context );
 163
 164                                 if ( set != null ) {
 165                                         expr = expr.replace( Expr.match[ type ], "" );
 166                                         break;
 167                                 }
 168                         }
 169                 }
 170         }
 171
 172         if ( !set ) {
 173                 set = context.getElementsByTagName("*");
 174         }
 175
 176         expr += later;
 177
 178         return {set: set, expr: expr};
 179 };
 180
 181 Sizzle.filter = function(expr, set, inplace){
 182         var old = expr, result = [], curLoop = set, match;
 183
 184         while ( expr && set.length ) {
 185                 for ( var type in Expr.filter ) {
 186                         if ( (match = Expr.match[ type ].exec( expr )) != null ) {
 187                                 var anyFound = false, filter = Expr.filter[ type ], goodArray = null;
 188
 189                                 if ( curLoop == result ) {
 190                                         result = [];
 191                                 }
 192
 193                                 if ( Expr.preFilter[ type ] ) {
 194                                         match = Expr.preFilter[ type ]( match, curLoop );
 195
 196                                         if ( match[0] === true ) {
 197                                                 goodArray = [];
 198                                                 var last = null, elem;
 199                                                 for ( var i = 0; (elem = curLoop[i]) !== undefined; i++ ) {
 200                                                         if ( elem && last !== elem ) {
 201                                                                 goodArray.push( elem );
 202                                                                 last = elem;
 203                                                         }
 204                                                 }
 205                                         }
 206
 207                                 }
 208
 209                                 var goodPos = 0, found, item;
 210
 211                                 for ( var i = 0; (item = curLoop[i]) !== undefined; i++ ) {
 212                                         if ( item ) {
 213                                                 if ( goodArray && item != goodArray[goodPos] ) {
 214                                                         goodPos++;
 215                                                 }
 216
 217                                                 found = filter( item, match, goodPos, goodArray );
 218                                                 if ( inplace && found != null ) {
 219                                                         curLoop[i] = found ? curLoop[i] : false;
 220                                                         if ( found ) {
 221                                                                 anyFound = true;
 222                                                         }
 223                                                 } else if ( found ) {
 224                                                         result.push( item );
 225                                                         anyFound = true;
 226                                                 }
 227                                         }
 228                                 }
 229
 230                                 if ( found !== undefined ) {
 231                                         if ( !inplace ) {
 232                                                 curLoop = result;
 233                                         }
 234
 235                                         expr = expr.replace( Expr.match[ type ], "" );
 236
 237                                         if ( !anyFound ) {
 238                                                 return [];
 239                                         }
 240
 241                                         break;
 242                                 }
 243                         }
 244                 }
 245
 246
 247                 expr = expr.replace(/\s*,\s*/, "");
 248
 249                 // Improper expression
 250                 if ( expr == old ) {
 251                         throw "Syntax error, unrecognized expression: " + expr;
 252                 }
 253
 254                 old = expr;
 255         }
 256
 257         return curLoop;
 258 };
 259
 260 var Expr = Sizzle.selectors = {
 261         order: [ "ID", "NAME", "TAG" ],
 262         match: {
 263                 ID: /#((?:[\w\u0128-\uFFFF_-]|\\.)+)/,
 264                 CLASS: /\.((?:[\w\u0128-\uFFFF_-]|\\.)+)/,
 265                 NAME: /\[name=((?:[\w\u0128-\uFFFF_-]|\\.)+)\]/,
 266                 ATTR: /\[((?:[\w\u0128-\uFFFF_-]|\\.)+)\s*(?:(\S{0,1}=)\s*(['"]*)(.*?)\3|)\]/,
 267                 TAG: /^((?:[\w\u0128-\uFFFF\*_-]|\\.)+)/,
 268                 CHILD: /:(only|nth|last|first)-child\(?(even|odd|[\dn+-]*)\)?/,
 269                 POS: /:(nth|eq|gt|lt|first|last|even|odd)\(?(\d*)\)?(?:[^-]|$)/,
 270                 PSEUDO: /:((?:[\w\u0128-\uFFFF_-]|\\.)+)(?:\((['"]*)((?:\([^\)]+\)|[^\2\(\)]*)+)\2\))?/
 271         },
 272         attrMap: {
 273                 "class": "className"
 274         },
 275         relative: {
 276                 "+": function(checkSet, part){
 277                         for ( var i = 0, l = checkSet.length; i < l; i++ ) {
 278                                 var elem = checkSet[i];
 279                                 if ( elem ) {
 280                                         var cur = elem.previousSibling;
 281                                         while ( cur && cur.nodeType !== 1 ) {
 282                                                 cur = cur.previousSibling;
 283                                         }
 284                                         checkSet[i] = typeof part === "string" ?
 285                                                 cur || false :
 286                                                 cur === part;
 287                                 }
 288                         }
 289
 290                         if ( typeof part === "string" ) {
 291                                 Sizzle.filter( part, checkSet, true );
 292                         }
 293                 },
 294                 ">": function(checkSet, part){
 295                         if ( typeof part === "string" && !/\W/.test(part) ) {
 296                                 part = part.toUpperCase();
 297
 298                                 for ( var i = 0, l = checkSet.length; i < l; i++ ) {
 299                                         var elem = checkSet[i];
 300                                         if ( elem ) {
 301                                                 var parent = elem.parentNode;
 302                                                 checkSet[i] = parent.nodeName === part ? parent : false;
 303                                         }
 304                                 }
 305                         } else {
 306                                 for ( var i = 0, l = checkSet.length; i < l; i++ ) {
 307                                         var elem = checkSet[i];
 308                                         if ( elem ) {
 309                                                 checkSet[i] = typeof part === "string" ?
 310                                                         elem.parentNode :
 311                                                         elem.parentNode === part;
 312                                         }
 313                                 }
 314
 315                                 if ( typeof part === "string" ) {
 316                                         Sizzle.filter( part, checkSet, true );
 317                                 }
 318                         }
 319                 },
 320                 "": function(checkSet, part){
 321                         var doneName = "done" + (done++), checkFn = dirCheck;
 322
 323                         if ( !part.match(/\W/) ) {
 324                                 var nodeCheck = part = part.toUpperCase();
 325                                 checkFn = dirNodeCheck;
 326                         }
 327
 328                         checkFn("parentNode", part, doneName, checkSet, nodeCheck);
 329                 },
 330                 "~": function(checkSet, part){
 331                         var doneName = "done" + (done++), checkFn = dirCheck;
 332
 333                         if ( typeof part === "string" && !part.match(/\W/) ) {
 334                                 var nodeCheck = part = part.toUpperCase();
 335                                 checkFn = dirNodeCheck;
 336                         }
 337
 338                         checkFn("previousSibling", part, doneName, checkSet, nodeCheck);
 339                 }
 340         },
 341         find: {
 342                 ID: function(match, context){
 343                         if ( context.getElementById ) {
 344                                 var m = context.getElementById(match[1]);
 345                                 return m ? [m] : [];
 346                         }
 347                 },
 348                 NAME: function(match, context){
 349                         return context.getElementsByName(match[1]);
 350                 },
 351                 TAG: function(match, context){
 352                         return context.getElementsByTagName(match[1]);
 353                 }
 354         },
 355         preFilter: {
 356                 CLASS: function(match){
 357                         return new RegExp( "(?:^|\\s)" + match[1] + "(?:\\s|$)" );
 358                 },
 359                 ID: function(match){
 360                         return match[1];
 361                 },
 362                 TAG: function(match){
 363                         return match[1].toUpperCase();
 364                 },
 365                 CHILD: function(match){
 366                         if ( match[1] == "nth" ) {
 367                                 // parse equations like 'even', 'odd', '5', '2n', '3n+2', '4n-1', '-n+6'
 368                                 var test = /(-?)(\d*)n((?:\+|-)?\d*)/.exec(
 369                                         match[2] == "even" && "2n" || match[2] == "odd" && "2n+1" ||
 370                                         !/\D/.test( match[2] ) && "0n+" + match[2] || match[2]);
 371
 372                                 // calculate the numbers (first)n+(last) including if they are negative
 373                                 match[2] = (test[1] + (test[2] || 1)) - 0;
 374                                 match[3] = test[3] - 0;
 375                         }
 376
 377                         // TODO: Move to normal caching system
 378                         match[0] = "done" + (done++);
 379
 380                         return match;
 381                 },
 382                 ATTR: function(match){
 383                         var name = match[1];
 384
 385                         if ( Expr.attrMap[name] ) {
 386                                 match[1] = Expr.attrMap[name];
 387                         }
 388
 389                         if ( match[2] === "~=" ) {
 390                                 match[4] = " " + match[4] + " ";
 391                         }
 392
 393                         return match;
 394                 },
 395                 PSEUDO: function(match){
 396                         if ( match[1] === "not" ) {
 397                                 match[3] = match[3].split(/\s*,\s*/);
 398                         }
 399
 400                         return match;
 401                 },
 402                 POS: function(match){
 403                         match.unshift( true );
 404                         return match;
 405                 }
 406         },
 407         filters: {
 408                 enabled: function(elem){
 409                         return elem.disabled === false && elem.type !== "hidden";
 410                 },
 411                 disabled: function(elem){
 412                         return elem.disabled === true;
 413                 },
 414                 checked: function(elem){
 415                         return elem.checked === true;
 416                 },
 417                 selected: function(elem){
 418                         // Accessing this property makes selected-by-default
 419                         // options in Safari work properly
 420                         elem.parentNode.selectedIndex;
 421                         return elem.selected === true;
 422                 },
 423                 parent: function(elem){
 424                         return !!elem.firstChild;
 425                 },
 426                 empty: function(elem){
 427                         return !elem.firstChild;
 428                 },
 429                 has: function(elem, i, match){
 430                         return !!Sizzle( match[3], elem ).length;
 431                 },
 432                 header: function(elem){
 433                         return /h\d/i.test( elem.nodeName );
 434                 },
 435                 text: function(elem){
 436                         return "text" === elem.type;
 437                 },
 438                 radio: function(elem){
 439                         return "radio" === elem.type;
 440                 },
 441                 checkbox: function(elem){
 442                         return "checkbox" === elem.type;
 443                 },
 444                 file: function(elem){
 445                         return "file" === elem.type;
 446                 },
 447                 password: function(elem){
 448                         return "password" === elem.type;
 449                 },
 450                 submit: function(elem){
 451                         return "submit" === elem.type;
 452                 },
 453                 image: function(elem){
 454                         return "image" === elem.type;
 455                 },
 456                 reset: function(elem){
 457                         return "reset" === elem.type;
 458                 },
 459                 button: function(elem){
 460                         return "button" === elem.type || elem.nodeName.toUpperCase() === "BUTTON";
 461                 },
 462                 input: function(elem){
 463                         return /input|select|textarea|button/i.test(elem.nodeName);
 464                 }
 465         },
 466         setFilters: {
 467                 first: function(elem, i){
 468                         return i === 0;
 469                 },
 470                 last: function(elem, i, match, array){
 471                         return i === array.length - 1;
 472                 },
 473                 even: function(elem, i){
 474                         return i % 2 === 0;
 475                 },
 476                 odd: function(elem, i){
 477                         return i % 2 === 1;
 478                 },
 479                 lt: function(elem, i, match){
 480                         return i < match[3] - 0;
 481                 },
 482                 gt: function(elem, i, match){
 483                         return i > match[3] - 0;
 484                 },
 485                 nth: function(elem, i, match){
 486                         return match[3] - 0 == i;
 487                 },
 488                 eq: function(elem, i, match){
 489                         return match[3] - 0 == i;
 490                 }
 491         },
 492         filter: {
 493                 CHILD: function(elem, match){
 494                         var type = match[1], parent = elem.parentNode;
 495
 496                         var doneName = match[0];
 497
 498                         if ( parent && !parent[ doneName ] ) {
 499                                 var count = 1;
 500
 501                                 for ( var node = parent.firstChild; node; node = node.nextSibling ) {
 502                                         if ( node.nodeType == 1 ) {
 503                                                 node.nodeIndex = count++;
 504                                         }
 505                                 }
 506
 507                                 parent[ doneName ] = count - 1;
 508                         }
 509
 510                         if ( type == "first" ) {
 511                                 return elem.nodeIndex == 1;
 512                         } else if ( type == "last" ) {
 513                                 return elem.nodeIndex == parent[ doneName ];
 514                         } else if ( type == "only" ) {
 515                                 return parent[ doneName ] == 1;
 516                         } else if ( type == "nth" ) {
 517                                 var add = false, first = match[2], last = match[3];
 518
 519                                 if ( first == 1 && last == 0 ) {
 520                                         return true;
 521                                 }
 522
 523                                 if ( first == 0 ) {
 524                                         if ( elem.nodeIndex == last ) {
 525                                                 add = true;
 526                                         }
 527                                 } else if ( (elem.nodeIndex - last) % first == 0 && (elem.nodeIndex - last) / first >= 0 ) {
 528                                         add = true;
 529                                 }
 530
 531                                 return add;
 532                         }
 533                 },
 534                 PSEUDO: function(elem, match, i, array){
 535                         var name = match[1], filter = Expr.filters[ name ];
 536
 537                         if ( filter ) {
 538                                 return filter( elem, i, match, array )
 539                         } else if ( name === "contains" ) {
 540                                 return (elem.textContent || elem.innerText || "").indexOf(match[3]) >= 0;
 541                         } else if ( name === "not" ) {
 542                                 var not = match[3];
 543
 544                                 for ( var i = 0, l = not.length; i < l; i++ ) {
 545                                         if ( Sizzle.filter(not[i], [elem]).length > 0 ) {
 546                                                 return false;
 547                                         }
 548                                 }
 549
 550                                 return true;
 551                         }
 552                 },
 553                 ID: function(elem, match){
 554                         return elem.nodeType === 1 && elem.getAttribute("id") === match;
 555                 },
 556                 TAG: function(elem, match){
 557                         return (match === "*" && elem.nodeType === 1) || elem.nodeName === match;
 558                 },
 559                 CLASS: function(elem, match){
 560                         return match.test( elem.className );
 561                 },
 562                 ATTR: function(elem, match){
 563                         var result = elem[ match[1] ] || elem.getAttribute( match[1] ), value = result + "", type = match[2], check = match[4];
 564                         return result == null ?
 565                                 false :
 566                                 type === "=" ?
 567                                 value === check :
 568                                 type === "*=" ?
 569                                 value.indexOf(check) >= 0 :
 570                                 type === "~=" ?
 571                                 (" " + value + " ").indexOf(check) >= 0 :
 572                                 !match[4] ?
 573                                 result :
 574                                 type === "!=" ?
 575                                 value != check :
 576                                 type === "^=" ?
 577                                 value.indexOf(check) === 0 :
 578                                 type === "$=" ?
 579                                 value.substr(value.length - check.length) === check :
 580                                 type === "|=" ?
 581                                 value === check || value.substr(0, check.length + 1) === check + "-" :
 582                                 false;
 583                 },
 584                 POS: function(elem, match, i, array){
 585                         var name = match[2], filter = Expr.setFilters[ name ];
 586
 587                         if ( filter ) {
 588                                 return filter( elem, i, match, array );
 589                         }
 590                 }
 591         }
 592 };
 593
 594 var makeArray = function(array, results) {
 595         array = Array.prototype.slice.call( array );
 596
 597         if ( results ) {
 598                 results.push.apply( results, array );
 599                 return results;
 600         }
 601
 602         return array;
 603 };
 604
 605 // Perform a simple check to determine if the browser is capable of
 606 // converting a NodeList to an array using builtin methods.
 607 try {
 608         Array.prototype.slice.call( document.documentElement.childNodes );
 609
 610 // Provide a fallback method if it does not work
 611 } catch(e){
 612         makeArray = function(array, results) {
 613                 var ret = results || [];
 614
 615                 if ( array instanceof Array ) {
 616                         Array.prototype.push.apply( ret, array );
 617                 } else {
 618                         if ( typeof array.length === "number" ) {
 619                                 for ( var i = 0, l = array.length; i < l; i++ ) {
 620                                         ret.push( array[i] );
 621                                 }
 622                         } else {
 623                                 for ( var i = 0; array[i]; i++ ) {
 624                                         ret.push( array[i] );
 625                                 }
 626                         }
 627                 }
 628
 629                 return ret;
 630         };
 631 }
 632
 633 // Check to see if the browser returns elements by name when
 634 // querying by getElementById (and provide a workaround)
 635 (function(){
 636         // We're going to inject a fake input element with a specified name
 637         var form = document.createElement("form"),
 638                 id = "script" + (new Date).getTime();
 639         form.innerHTML = "<input name='" + id + "'/>";
 640
 641         // Inject it into the root element, check its status, and remove it quickly
 642         var root = document.documentElement;
 643         root.insertBefore( form, root.firstChild );
 644
 645         // The workaround has to do additional checks after a getElementById
 646         // Which slows things down for other browsers (hence the branching)
 647         if ( !!document.getElementById( id ) ) {
 648                 Expr.find.ID = function(match, context){
 649                         if ( context.getElementById ) {
 650                                 var m = context.getElementById(match[1]);
 651                                 return m ? m.id === match[1] || m.getAttributeNode && m.getAttributeNode("id").nodeValue === match[1] ? [m] : undefined : [];
 652                         }
 653                 };
 654
 655                 Expr.filter.ID = function(elem, match){
 656                         var node = elem.getAttributeNode && elem.getAttributeNode("id");
 657                         return elem.nodeType === 1 && node && node.nodeValue === match;
 658                 };
 659         }
 660
 661         root.removeChild( form );
 662 })();
 663
 664 // Check to see if the browser returns only elements
 665 // when doing getElementsByTagName("*")
 666 (function(){
 667         // Create a fake element
 668         var div = document.createElement("div");
 669         div.appendChild( document.createComment("") );
 670
 671         // Make sure no comments are found
 672         if ( div.getElementsByTagName("*").length > 0 ) {
 673                 Expr.find.TAG = function(match, context){
 674                         var results = context.getElementsByTagName(match[1]);
 675
 676                         // Filter out possible comments
 677                         if ( match[1] === "*" ) {
 678                                 var tmp = [];
 679
 680                                 for ( var i = 0; results[i]; i++ ) {
 681                                         if ( results[i].nodeType === 1 ) {
 682                                                 tmp.push( results[i] );
 683                                         }
 684                                 }
 685
 686                                 results = tmp;
 687                         }
 688
 689                         return results;
 690                 };
 691         }
 692 })();
 693
 694 if ( document.querySelectorAll ) (function(){
 695         var oldSizzle = Sizzle;
 696
 697         Sizzle = function(query, context, extra){
 698                 context = context || document;
 699
 700                 if ( context.nodeType === 9 ) {
 701                         try {
 702                                 return makeArray( context.querySelectorAll(query) );
 703                         } catch(e){}
 704                 }
 705
 706                 return oldSizzle(query, context, extra);
 707         };
 708
 709         Sizzle.find = oldSizzle.find;
 710         Sizzle.filter = oldSizzle.filter;
 711         Sizzle.selectors = oldSizzle.selectors;
 712 })();
 713
 714 if ( document.documentElement.getElementsByClassName ) {
 715         Expr.order.splice(1, 0, "CLASS");
 716         Expr.find.CLASS = function(match, context) {
 717                 return context.getElementsByClassName(match[1]);
 718         };
 719 }
 720
 721 function dirNodeCheck( dir, cur, doneName, checkSet, nodeCheck ) {
 722         for ( var i = 0, l = checkSet.length; i < l; i++ ) {
 723                 var elem = checkSet[i];
 724                 if ( elem ) {
 725                         elem = elem[dir]
 726                         var match = false;
 727
 728                         while ( elem && elem.nodeType ) {
 729                                 var done = elem[doneName];
 730                                 if ( done ) {
 731                                         match = checkSet[ done ];
 732                                         break;
 733                                 }
 734
 735                                 if ( elem.nodeType === 1 )
 736                                         elem[doneName] = i;
 737
 738                                 if ( elem.nodeName === cur ) {
 739                                         match = elem;
 740                                         break;
 741                                 }
 742
 743                                 elem = elem[dir];
 744                         }
 745
 746                         checkSet[i] = match;
 747                 }
 748         }
 749 }
 750
 751 function dirCheck( dir, cur, doneName, checkSet, nodeCheck ) {
 752         for ( var i = 0, l = checkSet.length; i < l; i++ ) {
 753                 var elem = checkSet[i];
 754                 if ( elem ) {
 755                         elem = elem[dir]
 756                         var match = false;
 757
 758                         while ( elem && elem.nodeType ) {
 759                                 if ( elem[doneName] ) {
 760                                         match = checkSet[ elem[doneName] ];
 761                                         break;
 762                                 }
 763
 764                                 if ( elem.nodeType === 1 ) {
 765                                         elem[doneName] = i;
 766
 767                                         if ( typeof cur !== "string" ) {
 768                                                 if ( elem === cur ) {
 769                                                         match = true;
 770                                                         break;
 771                                                 }
 772
 773                                         } else if ( Sizzle.filter( cur, [elem] ).length > 0 ) {
 774                                                 match = elem;
 775                                                 break;
 776                                         }
 777                                 }
 778
 779                                 elem = elem[dir];
 780                         }
 781
 782                         checkSet[i] = match;
 783                 }
 784         }
 785 }
 786
 787 var contains = document.compareDocumentPosition ?  function(a, b){
 788         return a.compareDocumentPosition(b) & 16;
 789 } : function(a, b){
 790         return a !== b && a.contains(b);
 791 };
 792
 793 // EXPOSE
 794 jQuery.find = Sizzle;
 795 jQuery.filter = Sizzle.filter;
 796 jQuery.expr = Sizzle.selectors;
 797 jQuery.expr[":"] = jQuery.expr.filters;
 798
 799 Sizzle.selectors.filters.hidden = function(elem){
 800         return "hidden" === elem.type ||
 801                 jQuery.css(elem, "display") === "none" ||
 802                 jQuery.css(elem, "visibility") === "hidden";
 803 };
 804
 805 Sizzle.selectors.filters.visible = function(elem){
 806         return "hidden" !== elem.type &&
 807                 jQuery.css(elem, "display") !== "none" &&
 808                 jQuery.css(elem, "visibility") !== "hidden";
 809 };
 810
 811 jQuery.multiFilter = function( expr, elems, not ) {
 812         if ( not ) {
 813                 return jQuery.multiFilter( ":not(" + expr + ")", elems );
 814         }
 815
 816         var exprs = expr.split(/\s*,\s*/), cur = [];
 817
 818         for ( var i = 0; i < exprs.length; i++ ) {
 819                 cur = jQuery.merge( cur, jQuery.filter( exprs[i], elems ) );
 820         }
 821
 822         return cur;
 823 };
 824
 825 jQuery.dir = function( elem, dir ){
 826         var matched = [], cur = elem[dir];
 827         while ( cur && cur != document ) {
 828                 if ( cur.nodeType == 1 )
 829                         matched.push( cur );
 830                 cur = cur[dir];
 831         }
 832         return matched;
 833 };
 834
 835 jQuery.nth = function(cur, result, dir, elem){
 836         result = result || 1;
 837         var num = 0;
 838
 839         for ( ; cur; cur = cur[dir] )
 840                 if ( cur.nodeType == 1 && ++num == result )
 841                         break;
 842
 843         return cur;
 844 };
 845
 846 jQuery.sibling = function(n, elem){
 847         var r = [];
 848
 849         for ( ; n; n = n.nextSibling ) {
 850                 if ( n.nodeType == 1 && n != elem )
 851                         r.push( n );
 852         }
 853
 854         return r;
 855 };
 856
 857 return;
 858
 859 window.Sizzle = Sizzle;
 860
 861 })();