src/selector.js

   1
   2 var chars = jQuery.browser.safari && parseInt(jQuery.browser.version) < 417 ?
   3                 "(?:[\\w*_-]|\\\\.)" :
   4                 "(?:[\\w\u0128-\uFFFF*_-]|\\\\.)",
   5         quickChild = new RegExp("^>\\s*(" + chars + "+)"),
   6         quickID = new RegExp("^(" + chars + "+)(#)(" + chars + "+)"),
   7         quickClass = new RegExp("^([#.]?)(" + chars + "*)");
   8
   9 jQuery.extend({
  10         expr: {
  11                 "": function(a,i,m){return m[2]=="*"||jQuery.nodeName(a,m[2]);},
  12                 "#": function(a,i,m){return a.getAttribute("id")==m[2];},
  13                 ":": {
  14                         // Position Checks
  15                         lt: function(a,i,m){return i<m[3]-0;},
  16                         gt: function(a,i,m){return i>m[3]-0;},
  17                         nth: function(a,i,m){return m[3]-0==i;},
  18                         eq: function(a,i,m){return m[3]-0==i;},
  19                         first: function(a,i){return i==0;},
  20                         last: function(a,i,m,r){return i==r.length-1;},
  21                         even: function(a,i){return i%2==0;},
  22                         odd: function(a,i){return i%2;},
  23
  24                         // Child Checks
  25                         "first-child": function(a){return a.parentNode.getElementsByTagName("*")[0]==a;},
  26                         "last-child": function(a){return jQuery.nth(a.parentNode.lastChild,1,"previousSibling")==a;},
  27                         "only-child": function(a){return !jQuery.nth(a.parentNode.lastChild,2,"previousSibling");},
  28
  29                         // Parent Checks
  30                         parent: function(a){return a.firstChild;},
  31                         empty: function(a){return !a.firstChild;},
  32
  33                         // Text Check
  34                         contains: function(a,i,m){return (a.textContent||a.innerText||jQuery(a).text()||"").indexOf(m[3])>=0;},
  35
  36                         // Visibility
  37                         visible: function(a){return "hidden"!=a.type&&jQuery.css(a,"display")!="none"&&jQuery.css(a,"visibility")!="hidden";},
  38                         hidden: function(a){return "hidden"==a.type||jQuery.css(a,"display")=="none"||jQuery.css(a,"visibility")=="hidden";},
  39
  40                         // Form attributes
  41                         enabled: function(a){return !a.disabled;},
  42                         disabled: function(a){return a.disabled;},
  43                         checked: function(a){return a.checked;},
  44                         selected: function(a){return a.selected||jQuery.attr(a,"selected");},
  45
  46                         // Form elements
  47                         text: function(a){return "text"==a.type;},
  48                         radio: function(a){return "radio"==a.type;},
  49                         checkbox: function(a){return "checkbox"==a.type;},
  50                         file: function(a){return "file"==a.type;},
  51                         password: function(a){return "password"==a.type;},
  52                         submit: function(a){return "submit"==a.type;},
  53                         image: function(a){return "image"==a.type;},
  54                         reset: function(a){return "reset"==a.type;},
  55                         button: function(a){return "button"==a.type||jQuery.nodeName(a,"button");},
  56                         input: function(a){return /input|select|textarea|button/i.test(a.nodeName);},
  57
  58                         // :has()
  59                         has: function(a,i,m){return jQuery.find(m[3],a).length;},
  60
  61                         // :header
  62                         header: function(a){return /h\d/i.test(a.nodeName);},
  63
  64                         // :animated
  65                         animated: function(a){return jQuery.grep(jQuery.timers,function(fn){return a==fn.elem;}).length;}
  66                 }
  67         },
  68
  69         // The regular expressions that power the parsing engine
  70         parse: [
  71                 // Match: [@value='test'], [@foo]
  72                 /^(\[) *@?([\w-]+) *([!*$^~=]*) *('?"?)(.*?)\4 *\]/,
  73
  74                 // Match: :contains('foo')
  75                 /^(:)([\w-]+)\("?'?(.*?(\(.*?\))?[^(]*?)"?'?\)/,
  76
  77                 // Match: :even, :last-chlid, #id, .class
  78                 new RegExp("^([:.#]*)(" + chars + "+)")
  79         ],
  80
  81         multiFilter: function( expr, elems, not ) {
  82                 var old, cur = [];
  83
  84                 while ( expr && expr != old ) {
  85                         old = expr;
  86                         var f = jQuery.filter( expr, elems, not );
  87                         expr = f.t.replace(/^\s*,\s*/, "" );
  88                         cur = not ? elems = f.r : jQuery.merge( cur, f.r );
  89                 }
  90
  91                 return cur;
  92         },
  93
  94         find: function( t, context ) {
  95                 // Quickly handle non-string expressions
  96                 if ( typeof t != "string" )
  97                         return [ t ];
  98
  99                 // check to make sure context is a DOM element or a document
 100                 if ( context && context.nodeType != 1 && context.nodeType != 9)
 101                         return [ ];
 102
 103                 // Set the correct context (if none is provided)
 104                 context = context || document;
 105
 106                 // Initialize the search
 107                 var ret = [context], done = [], last, nodeName;
 108
 109                 // Continue while a selector expression exists, and while
 110                 // we're no longer looping upon ourselves
 111                 while ( t && last != t ) {
 112                         var r = [];
 113                         last = t;
 114
 115                         t = jQuery.trim(t);
 116
 117                         var foundToken = false;
 118
 119                         // An attempt at speeding up child selectors that
 120                         // point to a specific element tag
 121                         var re = quickChild;
 122                         var m = re.exec(t);
 123
 124                         if ( m ) {
 125                                 nodeName = m[1].toUpperCase();
 126
 127                                 // Perform our own iteration and filter
 128                                 for ( var i = 0; ret[i]; i++ )
 129                                         for ( var c = ret[i].firstChild; c; c = c.nextSibling )
 130                                                 if ( c.nodeType == 1 && (nodeName == "*" || c.nodeName.toUpperCase() == nodeName) )
 131                                                         r.push( c );
 132
 133                                 ret = r;
 134                                 t = t.replace( re, "" );
 135                                 if ( t.indexOf(" ") == 0 ) continue;
 136                                 foundToken = true;
 137                         } else {
 138                                 re = /^([>+~])\s*(\w*)/i;
 139
 140                                 if ( (m = re.exec(t)) != null ) {
 141                                         r = [];
 142
 143                                         var merge = {};
 144                                         nodeName = m[2].toUpperCase();
 145                                         m = m[1];
 146
 147                                         for ( var j = 0, rl = ret.length; j < rl; j++ ) {
 148                                                 var n = m == "~" || m == "+" ? ret[j].nextSibling : ret[j].firstChild;
 149                                                 for ( ; n; n = n.nextSibling )
 150                                                         if ( n.nodeType == 1 ) {
 151                                                                 var id = jQuery.data(n);
 152
 153                                                                 if ( m == "~" && merge[id] ) break;
 154
 155                                                                 if (!nodeName || n.nodeName.toUpperCase() == nodeName ) {
 156                                                                         if ( m == "~" ) merge[id] = true;
 157                                                                         r.push( n );
 158                                                                 }
 159
 160                                                                 if ( m == "+" ) break;
 161                                                         }
 162                                         }
 163
 164                                         ret = r;
 165
 166                                         // And remove the token
 167                                         t = jQuery.trim( t.replace( re, "" ) );
 168                                         foundToken = true;
 169                                 }
 170                         }
 171
 172                         // See if there's still an expression, and that we haven't already
 173                         // matched a token
 174                         if ( t && !foundToken ) {
 175                                 // Handle multiple expressions
 176                                 if ( !t.indexOf(",") ) {
 177                                         // Clean the result set
 178                                         if ( context == ret[0] ) ret.shift();
 179
 180                                         // Merge the result sets
 181                                         done = jQuery.merge( done, ret );
 182
 183                                         // Reset the context
 184                                         r = ret = [context];
 185
 186                                         // Touch up the selector string
 187                                         t = " " + t.substr(1,t.length);
 188
 189                                 } else {
 190                                         // Optimize for the case nodeName#idName
 191                                         var re2 = quickID;
 192                                         var m = re2.exec(t);
 193
 194                                         // Re-organize the results, so that they're consistent
 195                                         if ( m ) {
 196                                                 m = [ 0, m[2], m[3], m[1] ];
 197
 198                                         } else {
 199                                                 // Otherwise, do a traditional filter check for
 200                                                 // ID, class, and element selectors
 201                                                 re2 = quickClass;
 202                                                 m = re2.exec(t);
 203                                         }
 204
 205                                         m[2] = m[2].replace(/\\/g, "");
 206
 207                                         var elem = ret[ret.length-1];
 208
 209                                         // Try to do a global search by ID, where we can
 210                                         if ( m[1] == "#" && elem && elem.getElementById && !jQuery.isXMLDoc(elem) ) {
 211                                                 // Optimization for HTML document case
 212                                                 var oid = elem.getElementById(m[2]);
 213
 214                                                 // Do a quick check for the existence of the actual ID attribute
 215                                                 // to avoid selecting by the name attribute in IE
 216                                                 // also check to insure id is a string to avoid selecting an element with the name of 'id' inside a form
 217                                                 if ( (jQuery.browser.msie||jQuery.browser.opera) && oid && typeof oid.id == "string" && oid.id != m[2] )
 218                                                         oid = jQuery('[@id="'+m[2]+'"]', elem)[0];
 219
 220                                                 // Do a quick check for node name (where applicable) so
 221                                                 // that div#foo searches will be really fast
 222                                                 ret = r = oid && (!m[3] || jQuery.nodeName(oid, m[3])) ? [oid] : [];
 223                                         } else {
 224                                                 // We need to find all descendant elements
 225                                                 for ( var i = 0; ret[i]; i++ ) {
 226                                                         // Grab the tag name being searched for
 227                                                         var tag = m[1] == "#" && m[3] ? m[3] : m[1] != "" || m[0] == "" ? "*" : m[2];
 228
 229                                                         // Handle IE7 being really dumb about <object>s
 230                                                         if ( tag == "*" && ret[i].nodeName.toLowerCase() == "object" )
 231                                                                 tag = "param";
 232
 233                                                         r = jQuery.merge( r, ret[i].getElementsByTagName( tag ));
 234                                                 }
 235
 236                                                 // It's faster to filter by class and be done with it
 237                                                 if ( m[1] == "." )
 238                                                         r = jQuery.classFilter( r, m[2] );
 239
 240                                                 // Same with ID filtering
 241                                                 if ( m[1] == "#" ) {
 242                                                         var tmp = [];
 243
 244                                                         // Try to find the element with the ID
 245                                                         for ( var i = 0; r[i]; i++ )
 246                                                                 if ( r[i].getAttribute("id") == m[2] ) {
 247                                                                         tmp = [ r[i] ];
 248                                                                         break;
 249                                                                 }
 250
 251                                                         r = tmp;
 252                                                 }
 253
 254                                                 ret = r;
 255                                         }
 256
 257                                         t = t.replace( re2, "" );
 258                                 }
 259
 260                         }
 261
 262                         // If a selector string still exists
 263                         if ( t ) {
 264                                 // Attempt to filter it
 265                                 var val = jQuery.filter(t,r);
 266                                 ret = r = val.r;
 267                                 t = jQuery.trim(val.t);
 268                         }
 269                 }
 270
 271                 // An error occurred with the selector;
 272                 // just return an empty set instead
 273                 if ( t )
 274                         ret = [];
 275
 276                 // Remove the root context
 277                 if ( ret && context == ret[0] )
 278                         ret.shift();
 279
 280                 // And combine the results
 281                 done = jQuery.merge( done, ret );
 282
 283                 return done;
 284         },
 285
 286         classFilter: function(r,m,not){
 287                 m = " " + m + " ";
 288                 var tmp = [];
 289                 for ( var i = 0; r[i]; i++ ) {
 290                         var pass = (" " + r[i].className + " ").indexOf( m ) >= 0;
 291                         if ( !not && pass || not && !pass )
 292                                 tmp.push( r[i] );
 293                 }
 294                 return tmp;
 295         },
 296
 297         filter: function(t,r,not) {
 298                 var last;
 299
 300                 // Look for common filter expressions
 301                 while ( t && t != last ) {
 302                         last = t;
 303
 304                         var p = jQuery.parse, m;
 305
 306                         for ( var i = 0; p[i]; i++ ) {
 307                                 m = p[i].exec( t );
 308
 309                                 if ( m ) {
 310                                         // Remove what we just matched
 311                                         t = t.substring( m[0].length );
 312
 313                                         m[2] = m[2].replace(/\\/g, "");
 314                                         break;
 315                                 }
 316                         }
 317
 318                         if ( !m )
 319                                 break;
 320
 321                         // :not() is a special case that can be optimized by
 322                         // keeping it out of the expression list
 323                         if ( m[1] == ":" && m[2] == "not" )
 324                                 // optimize if only one selector found (most common case)
 325                                 r = isSimple.test( m[3] ) ?
 326                                         jQuery.filter(m[3], r, true).r :
 327                                         jQuery( r ).not( m[3] );
 328
 329                         // We can get a big speed boost by filtering by class here
 330                         else if ( m[1] == "." )
 331                                 r = jQuery.classFilter(r, m[2], not);
 332
 333                         else if ( m[1] == "[" ) {
 334                                 var tmp = [], type = m[3];
 335
 336                                 for ( var i = 0, rl = r.length; i < rl; i++ ) {
 337                                         var a = r[i], z = a[ jQuery.props[m[2]] || m[2] ];
 338
 339                                         if ( z == null || /href|src|selected/.test(m[2]) )
 340                                                 z = jQuery.attr(a,m[2]) || '';
 341
 342                                         if ( (type == "" && !!z ||
 343                                                  type == "=" && z == m[5] ||
 344                                                  type == "!=" && z != m[5] ||
 345                                                  type == "^=" && z && !z.indexOf(m[5]) ||
 346                                                  type == "$=" && z.substr(z.length - m[5].length) == m[5] ||
 347                                                  (type == "*=" || type == "~=") && z.indexOf(m[5]) >= 0) ^ not )
 348                                                         tmp.push( a );
 349                                 }
 350
 351                                 r = tmp;
 352
 353                         // We can get a speed boost by handling nth-child here
 354                         } else if ( m[1] == ":" && m[2] == "nth-child" ) {
 355                                 var merge = {}, tmp = [],
 356                                         // parse equations like 'even', 'odd', '5', '2n', '3n+2', '4n-1', '-n+6'
 357                                         test = /(-?)(\d*)n((?:\+|-)?\d*)/.exec(
 358                                                 m[3] == "even" && "2n" || m[3] == "odd" && "2n+1" ||
 359                                                 !/\D/.test(m[3]) && "0n+" + m[3] || m[3]),
 360                                         // calculate the numbers (first)n+(last) including if they are negative
 361                                         first = (test[1] + (test[2] || 1)) - 0, last = test[3] - 0;
 362
 363                                 // loop through all the elements left in the jQuery object
 364                                 for ( var i = 0, rl = r.length; i < rl; i++ ) {
 365                                         var node = r[i], parentNode = node.parentNode, id = jQuery.data(parentNode);
 366
 367                                         if ( !merge[id] ) {
 368                                                 var c = 1;
 369
 370                                                 for ( var n = parentNode.firstChild; n; n = n.nextSibling )
 371                                                         if ( n.nodeType == 1 )
 372                                                                 n.nodeIndex = c++;
 373
 374                                                 merge[id] = true;
 375                                         }
 376
 377                                         var add = false;
 378
 379                                         if ( first == 0 ) {
 380                                                 if ( node.nodeIndex == last )
 381                                                         add = true;
 382                                         } else if ( (node.nodeIndex - last) % first == 0 && (node.nodeIndex - last) / first >= 0 )
 383                                                 add = true;
 384
 385                                         if ( add ^ not )
 386                                                 tmp.push( node );
 387                                 }
 388
 389                                 r = tmp;
 390
 391                         // Otherwise, find the expression to execute
 392                         } else {
 393                                 var fn = jQuery.expr[ m[1] ];
 394                                 if ( typeof fn == "object" )
 395                                         fn = fn[ m[2] ];
 396
 397                                 if ( typeof fn == "string" )
 398                                         fn = eval("false||function(a,i){return " + fn + ";}");
 399
 400                                 // Execute it against the current filter
 401                                 r = jQuery.grep( r, function(elem, i){
 402                                         return fn(elem, i, m, r);
 403                                 }, not );
 404                         }
 405                 }
 406
 407                 // Return an array of filtered elements (r)
 408                 // and the modified expression string (t)
 409                 return { r: r, t: t };
 410         },
 411
 412         dir: function( elem, dir ){
 413                 var matched = [];
 414                 var cur = elem[dir];
 415                 while ( cur && cur != document ) {
 416                         if ( cur.nodeType == 1 )
 417                                 matched.push( cur );
 418                         cur = cur[dir];
 419                 }
 420                 return matched;
 421         },
 422
 423         nth: function(cur,result,dir,elem){
 424                 result = result || 1;
 425                 var num = 0;
 426
 427                 for ( ; cur; cur = cur[dir] )
 428                         if ( cur.nodeType == 1 && ++num == result )
 429                                 break;
 430
 431                 return cur;
 432         },
 433
 434         sibling: function( n, elem ) {
 435                 var r = [];
 436
 437                 for ( ; n; n = n.nextSibling ) {
 438                         if ( n.nodeType == 1 && (!elem || n != elem) )
 439                                 r.push( n );
 440                 }
 441
 442                 return r;
 443         }
 444 });
 445