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                 "": "m[2]=='*'||jQuery.nodeName(a,m[2])",
  12                 "#": "a.getAttribute('id')==m[2]",
  13                 ":": {
  14                         // Position Checks
  15                         lt: "i<m[3]-0",
  16                         gt: "i>m[3]-0",
  17                         nth: "m[3]-0==i",
  18                         eq: "m[3]-0==i",
  19                         first: "i==0",
  20                         last: "i==r.length-1",
  21                         even: "i%2==0",
  22                         odd: "i%2",
  23
  24                         // Child Checks
  25                         "first-child": "a.parentNode.getElementsByTagName('*')[0]==a",
  26                         "last-child": "jQuery.nth(a.parentNode.lastChild,1,'previousSibling')==a",
  27                         "only-child": "!jQuery.nth(a.parentNode.lastChild,2,'previousSibling')",
  28
  29                         // Parent Checks
  30                         parent: "a.firstChild",
  31                         empty: "!a.firstChild",
  32
  33                         // Text Check
  34                         contains: "(a.textContent||a.innerText||'').indexOf(m[3])>=0",
  35
  36                         // Visibility
  37                         visible: '"hidden"!=a.type&&jQuery.css(a,"display")!="none"&&jQuery.css(a,"visibility")!="hidden"',
  38                         hidden: '"hidden"==a.type||jQuery.css(a,"display")=="none"||jQuery.css(a,"visibility")=="hidden"',
  39
  40                         // Form attributes
  41                         enabled: "!a.disabled",
  42                         disabled: "a.disabled",
  43                         checked: "a.checked",
  44                         selected: "a.selected||jQuery.attr(a,'selected')",
  45
  46                         // Form elements
  47                         text: "'text'==a.type",
  48                         radio: "'radio'==a.type",
  49                         checkbox: "'checkbox'==a.type",
  50                         file: "'file'==a.type",
  51                         password: "'password'==a.type",
  52                         submit: "'submit'==a.type",
  53                         image: "'image'==a.type",
  54                         reset: "'reset'==a.type",
  55                         button: '"button"==a.type||jQuery.nodeName(a,"button")',
  56                         input: "/input|select|textarea|button/i.test(a.nodeName)",
  57
  58                         // :has()
  59                         has: "jQuery.find(m[3],a).length",
  60
  61                         // :header
  62                         header: "/h\\d/i.test(a.nodeName)",
  63
  64                         // :animated
  65                         animated: "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                 // Make sure that the context is a DOM Element
 100                 if ( context && !context.nodeType )
 101                         context = null;
 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;
 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                                 var 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.toUpperCase()) )
 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 nodeName = m[2], mergeNum = jQuery.mergeNum++;
 144                                         m = m[1];
 145
 146                                         for ( var j = 0, rl = ret.length; j < rl; j++ ) {
 147                                                 var n = m == "~" || m == "+" ? ret[j].nextSibling : ret[j].firstChild;
 148                                                 for ( ; n; n = n.nextSibling )
 149                                                         if ( n.nodeType == 1 ) {
 150                                                                 if ( m == "~" && n.mergeNum == mergeNum ) break;
 151
 152                                                                 if (!nodeName || n.nodeName.toUpperCase() == nodeName.toUpperCase() ) {
 153                                                                         if ( m == "~" ) n.mergeNum = mergeNum;
 154                                                                         r.push( n );
 155                                                                 }
 156
 157                                                                 if ( m == "+" ) break;
 158                                                         }
 159                                         }
 160
 161                                         ret = r;
 162
 163                                         // And remove the token
 164                                         t = jQuery.trim( t.replace( re, "" ) );
 165                                         foundToken = true;
 166                                 }
 167                         }
 168
 169                         // See if there's still an expression, and that we haven't already
 170                         // matched a token
 171                         if ( t && !foundToken ) {
 172                                 // Handle multiple expressions
 173                                 if ( !t.indexOf(",") ) {
 174                                         // Clean the result set
 175                                         if ( context == ret[0] ) ret.shift();
 176
 177                                         // Merge the result sets
 178                                         done = jQuery.merge( done, ret );
 179
 180                                         // Reset the context
 181                                         r = ret = [context];
 182
 183                                         // Touch up the selector string
 184                                         t = " " + t.substr(1,t.length);
 185
 186                                 } else {
 187                                         // Optimize for the case nodeName#idName
 188                                         var re2 = quickID;
 189                                         var m = re2.exec(t);
 190
 191                                         // Re-organize the results, so that they're consistent
 192                                         if ( m ) {
 193                                            m = [ 0, m[2], m[3], m[1] ];
 194
 195                                         } else {
 196                                                 // Otherwise, do a traditional filter check for
 197                                                 // ID, class, and element selectors
 198                                                 re2 = quickClass;
 199                                                 m = re2.exec(t);
 200                                         }
 201
 202                                         m[2] = m[2].replace(/\\/g, "");
 203
 204                                         var elem = ret[ret.length-1];
 205
 206                                         // Try to do a global search by ID, where we can
 207                                         if ( m[1] == "#" && elem && elem.getElementById && !jQuery.isXMLDoc(elem) ) {
 208                                                 // Optimization for HTML document case
 209                                                 var oid = elem.getElementById(m[2]);
 210
 211                                                 // Do a quick check for the existence of the actual ID attribute
 212                                                 // to avoid selecting by the name attribute in IE
 213                                                 // also check to insure id is a string to avoid selecting an element with the name of 'id' inside a form
 214                                                 if ( (jQuery.browser.msie||jQuery.browser.opera) && oid && typeof oid.id == "string" && oid.id != m[2] )
 215                                                         oid = jQuery('[@id="'+m[2]+'"]', elem)[0];
 216
 217                                                 // Do a quick check for node name (where applicable) so
 218                                                 // that div#foo searches will be really fast
 219                                                 ret = r = oid && (!m[3] || jQuery.nodeName(oid, m[3])) ? [oid] : [];
 220                                         } else {
 221                                                 // We need to find all descendant elements
 222                                                 for ( var i = 0; ret[i]; i++ ) {
 223                                                         // Grab the tag name being searched for
 224                                                         var tag = m[1] == "#" && m[3] ? m[3] : m[1] != "" || m[0] == "" ? "*" : m[2];
 225
 226                                                         // Handle IE7 being really dumb about <object>s
 227                                                         if ( tag == "*" && ret[i].nodeName.toLowerCase() == "object" )
 228                                                                 tag = "param";
 229
 230                                                         r = jQuery.merge( r, ret[i].getElementsByTagName( tag ));
 231                                                 }
 232
 233                                                 // It's faster to filter by class and be done with it
 234                                                 if ( m[1] == "." )
 235                                                         r = jQuery.classFilter( r, m[2] );
 236
 237                                                 // Same with ID filtering
 238                                                 if ( m[1] == "#" ) {
 239                                                         var tmp = [];
 240
 241                                                         // Try to find the element with the ID
 242                                                         for ( var i = 0; r[i]; i++ )
 243                                                                 if ( r[i].getAttribute("id") == m[2] ) {
 244                                                                         tmp = [ r[i] ];
 245                                                                         break;
 246                                                                 }
 247
 248                                                         r = tmp;
 249                                                 }
 250
 251                                                 ret = r;
 252                                         }
 253
 254                                         t = t.replace( re2, "" );
 255                                 }
 256
 257                         }
 258
 259                         // If a selector string still exists
 260                         if ( t ) {
 261                                 // Attempt to filter it
 262                                 var val = jQuery.filter(t,r);
 263                                 ret = r = val.r;
 264                                 t = jQuery.trim(val.t);
 265                         }
 266                 }
 267
 268                 // An error occurred with the selector;
 269                 // just return an empty set instead
 270                 if ( t )
 271                         ret = [];
 272
 273                 // Remove the root context
 274                 if ( ret && context == ret[0] )
 275                         ret.shift();
 276
 277                 // And combine the results
 278                 done = jQuery.merge( done, ret );
 279
 280                 return done;
 281         },
 282
 283         classFilter: function(r,m,not){
 284                 m = " " + m + " ";
 285                 var tmp = [];
 286                 for ( var i = 0; r[i]; i++ ) {
 287                         var pass = (" " + r[i].className + " ").indexOf( m ) >= 0;
 288                         if ( !not && pass || not && !pass )
 289                                 tmp.push( r[i] );
 290                 }
 291                 return tmp;
 292         },
 293
 294         filter: function(t,r,not) {
 295                 var last;
 296
 297                 // Look for common filter expressions
 298                 while ( t  && t != last ) {
 299                         last = t;
 300
 301                         var p = jQuery.parse, m;
 302
 303                         for ( var i = 0; p[i]; i++ ) {
 304                                 m = p[i].exec( t );
 305
 306                                 if ( m ) {
 307                                         // Remove what we just matched
 308                                         t = t.substring( m[0].length );
 309
 310                                         m[2] = m[2].replace(/\\/g, "");
 311                                         break;
 312                                 }
 313                         }
 314
 315                         if ( !m )
 316                                 break;
 317
 318                         // :not() is a special case that can be optimized by
 319                         // keeping it out of the expression list
 320                         if ( m[1] == ":" && m[2] == "not" )
 321                                 r = jQuery.filter(m[3], r, true).r;
 322
 323                         // We can get a big speed boost by filtering by class here
 324                         else if ( m[1] == "." )
 325                                 r = jQuery.classFilter(r, m[2], not);
 326
 327                         else if ( m[1] == "[" ) {
 328                                 var tmp = [], type = m[3];
 329
 330                                 for ( var i = 0, rl = r.length; i < rl; i++ ) {
 331                                         var a = r[i], z = a[ jQuery.props[m[2]] || m[2] ];
 332
 333                                         if ( z == null || /href|src|selected/.test(m[2]) )
 334                                                 z = jQuery.attr(a,m[2]) || '';
 335
 336                                         if ( (type == "" && !!z ||
 337                                                  type == "=" && z == m[5] ||
 338                                                  type == "!=" && z != m[5] ||
 339                                                  type == "^=" && z && !z.indexOf(m[5]) ||
 340                                                  type == "$=" && z.substr(z.length - m[5].length) == m[5] ||
 341                                                  (type == "*=" || type == "~=") && z.indexOf(m[5]) >= 0) ^ not )
 342                                                         tmp.push( a );
 343                                 }
 344
 345                                 r = tmp;
 346
 347                         // We can get a speed boost by handling nth-child here
 348                         } else if ( m[1] == ":" && m[2] == "nth-child" ) {
 349                                 var num = jQuery.mergeNum++, tmp = [],
 350                                         test = /(\d*)n\+?(\d*)/.exec(
 351                                                 m[3] == "even" && "2n" || m[3] == "odd" && "2n+1" ||
 352                                                 !/\D/.test(m[3]) && "n+" + m[3] || m[3]),
 353                                         first = (test[1] || 1) - 0, last = test[2] - 0;
 354
 355                                 for ( var i = 0, rl = r.length; i < rl; i++ ) {
 356                                         var node = r[i], parentNode = node.parentNode;
 357
 358                                         if ( num != parentNode.mergeNum ) {
 359                                                 var c = 1;
 360
 361                                                 for ( var n = parentNode.firstChild; n; n = n.nextSibling )
 362                                                         if ( n.nodeType == 1 )
 363                                                                 n.nodeIndex = c++;
 364
 365                                                 parentNode.mergeNum = num;
 366                                         }
 367
 368                                         var add = false;
 369
 370                                         if ( first == 1 ) {
 371                                                 if ( last == 0 || node.nodeIndex == last )
 372                                                         add = true;
 373                                         } else if ( (node.nodeIndex + last) % first == 0 )
 374                                                 add = true;
 375
 376                                         if ( add ^ not )
 377                                                 tmp.push( node );
 378                                 }
 379
 380                                 r = tmp;
 381
 382                         // Otherwise, find the expression to execute
 383                         } else {
 384                                 var f = jQuery.expr[m[1]];
 385                                 if ( typeof f != "string" )
 386                                         f = jQuery.expr[m[1]][m[2]];
 387
 388                                 // Build a custom macro to enclose it
 389                                 f = eval("false||function(a,i){return " + f + "}");
 390
 391                                 // Execute it against the current filter
 392                                 r = jQuery.grep( r, f, not );
 393                         }
 394                 }
 395
 396                 // Return an array of filtered elements (r)
 397                 // and the modified expression string (t)
 398                 return { r: r, t: t };
 399         },
 400
 401         parents: function( elem ){
 402                 var matched = [];
 403                 var cur = elem.parentNode;
 404                 while ( cur && cur != document ) {
 405                         matched.push( cur );
 406                         cur = cur.parentNode;
 407                 }
 408                 return matched;
 409         },
 410
 411         nth: function(cur,result,dir,elem){
 412                 result = result || 1;
 413                 var num = 0;
 414
 415                 for ( ; cur; cur = cur[dir] )
 416                         if ( cur.nodeType == 1 && ++num == result )
 417                                 break;
 418
 419                 return cur;
 420         },
 421
 422         sibling: function( n, elem ) {
 423                 var r = [];
 424
 425                 for ( ; n; n = n.nextSibling ) {
 426                         if ( n.nodeType == 1 && (!elem || n != elem) )
 427                                 r.push( n );
 428                 }
 429
 430                 return r;
 431         }
 432 });