src/selector/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                 // DEPRECATED
  65                 "[": "jQuery.find(m[2],a).length"
  66         },
  67
  68         // The regular expressions that power the parsing engine
  69         parse: [
  70                 // Match: [@value='test'], [@foo]
  71                 /^\[ *(@)([\w-]+) *([!*$^~=]*) *('?"?)(.*?)\4 *\]/,
  72
  73                 // DEPRECATED
  74                 // Match: [div], [div p]
  75                 /^(\[)\s*(.*?(\[.*?\])?[^[]*?)\s*\]/,
  76
  77                 // Match: :contains('foo')
  78                 /^(:)([\w-]+)\("?'?(.*?(\(.*?\))?[^(]*?)"?'?\)/,
  79
  80                 // Match: :even, :last-chlid, #id, .class
  81                 new RegExp("^([:.#]*)(" + chars + "+)")
  82         ],
  83
  84         multiFilter: function( expr, elems, not ) {
  85                 var old, cur = [];
  86
  87                 while ( expr && expr != old ) {
  88                         old = expr;
  89                         var f = jQuery.filter( expr, elems, not );
  90                         expr = f.t.replace(/^\s*,\s*/, "" );
  91                         cur = not ? elems = f.r : jQuery.merge( cur, f.r );
  92                 }
  93
  94                 return cur;
  95         },
  96
  97         /**
  98          * @name $.find
  99          * @type Array<Element>
 100          * @private
 101          * @cat Core
 102          */
 103         find: function( t, context ) {
 104                 // Quickly handle non-string expressions
 105                 if ( typeof t != "string" )
 106                         return [ t ];
 107
 108                 // Make sure that the context is a DOM Element
 109                 if ( context && !context.nodeType )
 110                         context = null;
 111
 112                 // Set the correct context (if none is provided)
 113                 context = context || document;
 114
 115                 // DEPRECATED
 116                 // Handle the common XPath // expression
 117                 if ( !t.indexOf("//") ) {
 118                         //context = context.documentElement;
 119                         t = t.substr(2,t.length);
 120
 121                 // DEPRECATED
 122                 // And the / root expression
 123                 } else if ( !t.indexOf("/") && !context.ownerDocument ) {
 124                         context = context.documentElement;
 125                         t = t.substr(1,t.length);
 126                         if ( t.indexOf("/") >= 1 )
 127                                 t = t.substr(t.indexOf("/"),t.length);
 128                 }
 129
 130                 // Initialize the search
 131                 var ret = [context], done = [], last;
 132
 133                 // Continue while a selector expression exists, and while
 134                 // we're no longer looping upon ourselves
 135                 while ( t && last != t ) {
 136                         var r = [];
 137                         last = t;
 138
 139                         // DEPRECATED
 140                         t = jQuery.trim(t).replace( /^\/\//, "" );
 141
 142                         var foundToken = false;
 143
 144                         // An attempt at speeding up child selectors that
 145                         // point to a specific element tag
 146                         var re = quickChild;
 147                         var m = re.exec(t);
 148
 149                         if ( m ) {
 150                                 var nodeName = m[1].toUpperCase();
 151
 152                                 // Perform our own iteration and filter
 153                                 for ( var i = 0; ret[i]; i++ )
 154                                         for ( var c = ret[i].firstChild; c; c = c.nextSibling )
 155                                                 if ( c.nodeType == 1 && (nodeName == "*" || c.nodeName.toUpperCase() == nodeName.toUpperCase()) )
 156                                                         r.push( c );
 157
 158                                 ret = r;
 159                                 t = t.replace( re, "" );
 160                                 if ( t.indexOf(" ") == 0 ) continue;
 161                                 foundToken = true;
 162                         } else {
 163                                 // (.. and /) DEPRECATED
 164                                 re = /^((\/?\.\.)|([>\/+~]))\s*(\w*)/i;
 165
 166                                 if ( (m = re.exec(t)) != null ) {
 167                                         r = [];
 168
 169                                         var nodeName = m[4], mergeNum = jQuery.mergeNum++;
 170                                         m = m[1];
 171
 172                                         for ( var j = 0, rl = ret.length; j < rl; j++ )
 173                                                 if ( m.indexOf("..") < 0 ) {
 174                                                         var n = m == "~" || m == "+" ? ret[j].nextSibling : ret[j].firstChild;
 175                                                         for ( ; n; n = n.nextSibling )
 176                                                                 if ( n.nodeType == 1 ) {
 177                                                                         if ( m == "~" && n.mergeNum == mergeNum ) break;
 178
 179                                                                         if (!nodeName || n.nodeName.toUpperCase() == nodeName.toUpperCase() ) {
 180                                                                                 if ( m == "~" ) n.mergeNum = mergeNum;
 181                                                                                 r.push( n );
 182                                                                         }
 183
 184                                                                         if ( m == "+" ) break;
 185                                                                 }
 186                                                 // DEPRECATED
 187                                                 } else
 188                                                         r.push( ret[j].parentNode );
 189
 190                                         ret = r;
 191
 192                                         // And remove the token
 193                                         t = jQuery.trim( t.replace( re, "" ) );
 194                                         foundToken = true;
 195                                 }
 196                         }
 197
 198                         // See if there's still an expression, and that we haven't already
 199                         // matched a token
 200                         if ( t && !foundToken ) {
 201                                 // Handle multiple expressions
 202                                 if ( !t.indexOf(",") ) {
 203                                         // Clean the result set
 204                                         if ( context == ret[0] ) ret.shift();
 205
 206                                         // Merge the result sets
 207                                         done = jQuery.merge( done, ret );
 208
 209                                         // Reset the context
 210                                         r = ret = [context];
 211
 212                                         // Touch up the selector string
 213                                         t = " " + t.substr(1,t.length);
 214
 215                                 } else {
 216                                         // Optimize for the case nodeName#idName
 217                                         var re2 = quickID;
 218                                         var m = re2.exec(t);
 219
 220                                         // Re-organize the results, so that they're consistent
 221                                         if ( m ) {
 222                                            m = [ 0, m[2], m[3], m[1] ];
 223
 224                                         } else {
 225                                                 // Otherwise, do a traditional filter check for
 226                                                 // ID, class, and element selectors
 227                                                 re2 = quickClass;
 228                                                 m = re2.exec(t);
 229                                         }
 230
 231                                         m[2] = m[2].replace(/\\/g, "");
 232
 233                                         var elem = ret[ret.length-1];
 234
 235                                         // Try to do a global search by ID, where we can
 236                                         if ( m[1] == "#" && elem && elem.getElementById && !jQuery.isXMLDoc(elem) ) {
 237                                                 // Optimization for HTML document case
 238                                                 var oid = elem.getElementById(m[2]);
 239
 240                                                 // Do a quick check for the existence of the actual ID attribute
 241                                                 // to avoid selecting by the name attribute in IE
 242                                                 // also check to insure id is a string to avoid selecting an element with the name of 'id' inside a form
 243                                                 if ( (jQuery.browser.msie||jQuery.browser.opera) && oid && typeof oid.id == "string" && oid.id != m[2] )
 244                                                         oid = jQuery('[@id="'+m[2]+'"]', elem)[0];
 245
 246                                                 // Do a quick check for node name (where applicable) so
 247                                                 // that div#foo searches will be really fast
 248                                                 ret = r = oid && (!m[3] || jQuery.nodeName(oid, m[3])) ? [oid] : [];
 249                                         } else {
 250                                                 // We need to find all descendant elements
 251                                                 for ( var i = 0; ret[i]; i++ ) {
 252                                                         // Grab the tag name being searched for
 253                                                         var tag = m[1] == "#" && m[3] ? m[3] : m[1] != "" || m[0] == "" ? "*" : m[2];
 254
 255                                                         // Handle IE7 being really dumb about <object>s
 256                                                         if ( tag == "*" && ret[i].nodeName.toLowerCase() == "object" )
 257                                                                 tag = "param";
 258
 259                                                         r = jQuery.merge( r, ret[i].getElementsByTagName( tag ));
 260                                                 }
 261
 262                                                 // It's faster to filter by class and be done with it
 263                                                 if ( m[1] == "." )
 264                                                         r = jQuery.classFilter( r, m[2] );
 265
 266                                                 // Same with ID filtering
 267                                                 if ( m[1] == "#" ) {
 268                                                         var tmp = [];
 269
 270                                                         // Try to find the element with the ID
 271                                                         for ( var i = 0; r[i]; i++ )
 272                                                                 if ( r[i].getAttribute("id") == m[2] ) {
 273                                                                         tmp = [ r[i] ];
 274                                                                         break;
 275                                                                 }
 276
 277                                                         r = tmp;
 278                                                 }
 279
 280                                                 ret = r;
 281                                         }
 282
 283                                         t = t.replace( re2, "" );
 284                                 }
 285
 286                         }
 287
 288                         // If a selector string still exists
 289                         if ( t ) {
 290                                 // Attempt to filter it
 291                                 var val = jQuery.filter(t,r);
 292                                 ret = r = val.r;
 293                                 t = jQuery.trim(val.t);
 294                         }
 295                 }
 296
 297                 // An error occurred with the selector;
 298                 // just return an empty set instead
 299                 if ( t )
 300                         ret = [];
 301
 302                 // Remove the root context
 303                 if ( ret && context == ret[0] )
 304                         ret.shift();
 305
 306                 // And combine the results
 307                 done = jQuery.merge( done, ret );
 308
 309                 return done;
 310         },
 311
 312         classFilter: function(r,m,not){
 313                 m = " " + m + " ";
 314                 var tmp = [];
 315                 for ( var i = 0; r[i]; i++ ) {
 316                         var pass = (" " + r[i].className + " ").indexOf( m ) >= 0;
 317                         if ( !not && pass || not && !pass )
 318                                 tmp.push( r[i] );
 319                 }
 320                 return tmp;
 321         },
 322
 323         filter: function(t,r,not) {
 324                 var last;
 325
 326                 // Look for common filter expressions
 327                 while ( t  && t != last ) {
 328                         last = t;
 329
 330                         var p = jQuery.parse, m;
 331
 332                         for ( var i = 0; p[i]; i++ ) {
 333                                 m = p[i].exec( t );
 334
 335                                 if ( m ) {
 336                                         // Remove what we just matched
 337                                         t = t.substring( m[0].length );
 338
 339                                         m[2] = m[2].replace(/\\/g, "");
 340                                         break;
 341                                 }
 342                         }
 343
 344                         if ( !m )
 345                                 break;
 346
 347                         // :not() is a special case that can be optimized by
 348                         // keeping it out of the expression list
 349                         if ( m[1] == ":" && m[2] == "not" )
 350                                 r = jQuery.filter(m[3], r, true).r;
 351
 352                         // We can get a big speed boost by filtering by class here
 353                         else if ( m[1] == "." )
 354                                 r = jQuery.classFilter(r, m[2], not);
 355
 356                         else if ( m[1] == "@" ) {
 357                                 var tmp = [], type = m[3];
 358
 359                                 for ( var i = 0, rl = r.length; i < rl; i++ ) {
 360                                         var a = r[i], z = a[ jQuery.props[m[2]] || m[2] ];
 361
 362                                         if ( z == null || /href|src|selected/.test(m[2]) )
 363                                                 z = jQuery.attr(a,m[2]) || '';
 364
 365                                         if ( (type == "" && !!z ||
 366                                                  type == "=" && z == m[5] ||
 367                                                  type == "!=" && z != m[5] ||
 368                                                  type == "^=" && z && !z.indexOf(m[5]) ||
 369                                                  type == "$=" && z.substr(z.length - m[5].length) == m[5] ||
 370                                                  (type == "*=" || type == "~=") && z.indexOf(m[5]) >= 0) ^ not )
 371                                                         tmp.push( a );
 372                                 }
 373
 374                                 r = tmp;
 375
 376                         // We can get a speed boost by handling nth-child here
 377                         } else if ( m[1] == ":" && m[2] == "nth-child" ) {
 378                                 var num = jQuery.mergeNum++, tmp = [],
 379                                         test = /(\d*)n\+?(\d*)/.exec(
 380                                                 m[3] == "even" && "2n" || m[3] == "odd" && "2n+1" ||
 381                                                 !/\D/.test(m[3]) && "n+" + m[3] || m[3]),
 382                                         first = (test[1] || 1) - 0, last = test[2] - 0;
 383
 384                                 for ( var i = 0, rl = r.length; i < rl; i++ ) {
 385                                         var node = r[i], parentNode = node.parentNode;
 386
 387                                         if ( num != parentNode.mergeNum ) {
 388                                                 var c = 1;
 389
 390                                                 for ( var n = parentNode.firstChild; n; n = n.nextSibling )
 391                                                         if ( n.nodeType == 1 )
 392                                                                 n.nodeIndex = c++;
 393
 394                                                 parentNode.mergeNum = num;
 395                                         }
 396
 397                                         var add = false;
 398
 399                                         if ( first == 1 ) {
 400                                                 if ( last == 0 || node.nodeIndex == last )
 401                                                         add = true;
 402                                         } else if ( (node.nodeIndex + last) % first == 0 )
 403                                                 add = true;
 404
 405                                         if ( add ^ not )
 406                                                 tmp.push( node );
 407                                 }
 408
 409                                 r = tmp;
 410
 411                         // Otherwise, find the expression to execute
 412                         } else {
 413                                 var f = jQuery.expr[m[1]];
 414                                 if ( typeof f != "string" )
 415                                         f = jQuery.expr[m[1]][m[2]];
 416
 417                                 // Build a custom macro to enclose it
 418                                 f = eval("false||function(a,i){return " + f + "}");
 419
 420                                 // Execute it against the current filter
 421                                 r = jQuery.grep( r, f, not );
 422                         }
 423                 }
 424
 425                 // Return an array of filtered elements (r)
 426                 // and the modified expression string (t)
 427                 return { r: r, t: t };
 428         },
 429
 430         /**
 431          * All ancestors of a given element.
 432          *
 433          * @private
 434          * @name $.parents
 435          * @type Array<Element>
 436          * @param Element elem The element to find the ancestors of.
 437          * @cat DOM/Traversing
 438          */
 439         parents: function( elem ){
 440                 var matched = [];
 441                 var cur = elem.parentNode;
 442                 while ( cur && cur != document ) {
 443                         matched.push( cur );
 444                         cur = cur.parentNode;
 445                 }
 446                 return matched;
 447         },
 448
 449         /**
 450          * A handy, and fast, way to traverse in a particular direction and find
 451          * a specific element.
 452          *
 453          * @private
 454          * @name $.nth
 455          * @type DOMElement
 456          * @param DOMElement cur The element to search from.
 457          * @param String|Number num The Nth result to match. Can be a number or a string (like 'even' or 'odd').
 458          * @param String dir The direction to move in (pass in something like 'previousSibling' or 'nextSibling').
 459          * @cat DOM/Traversing
 460          */
 461         nth: function(cur,result,dir,elem){
 462                 result = result || 1;
 463                 var num = 0;
 464
 465                 for ( ; cur; cur = cur[dir] )
 466                         if ( cur.nodeType == 1 && ++num == result )
 467                                 break;
 468
 469                 return cur;
 470         },
 471
 472         /**
 473          * All elements on a specified axis.
 474          *
 475          * @private
 476          * @name $.sibling
 477          * @type Array
 478          * @param Element elem The element to find all the siblings of (including itself).
 479          * @cat DOM/Traversing
 480          */
 481         sibling: function( n, elem ) {
 482                 var r = [];
 483
 484                 for ( ; n; n = n.nextSibling ) {
 485                         if ( n.nodeType == 1 && (!elem || n != elem) )
 486                                 r.push( n );
 487                 }
 488
 489                 return r;
 490         }
 491 });