src/selector/selector.js

   1 jQuery.extend({
   2         expr: {
   3                 "": "m[2]=='*'||jQuery.nodeName(a,m[2])",
   4                 "#": "a.getAttribute('id')==m[2]",
   5                 ":": {
   6                         // Position Checks
   7                         lt: "i<m[3]-0",
   8                         gt: "i>m[3]-0",
   9                         nth: "m[3]-0==i",
  10                         eq: "m[3]-0==i",
  11                         first: "i==0",
  12                         last: "i==r.length-1",
  13                         even: "i%2==0",
  14                         odd: "i%2",
  15
  16                         // Child Checks
  17                         "first-child": "a.parentNode.getElementsByTagName('*')[0]==a",
  18                         "last-child": "jQuery.nth(a.parentNode.lastChild,1,'previousSibling')==a",
  19                         "only-child": "!jQuery.nth(a.parentNode.lastChild,2,'previousSibling')",
  20
  21                         // Parent Checks
  22                         parent: "a.firstChild",
  23                         empty: "!a.firstChild",
  24
  25                         // Text Check
  26                         contains: "(a.textContent||a.innerText||'').indexOf(m[3])>=0",
  27
  28                         // Visibility
  29                         visible: '"hidden"!=a.type&&jQuery.css(a,"display")!="none"&&jQuery.css(a,"visibility")!="hidden"',
  30                         hidden: '"hidden"==a.type||jQuery.css(a,"display")=="none"||jQuery.css(a,"visibility")=="hidden"',
  31
  32                         // Form attributes
  33                         enabled: "!a.disabled",
  34                         disabled: "a.disabled",
  35                         checked: "a.checked",
  36                         selected: "a.selected||jQuery.attr(a,'selected')",
  37
  38                         // Form elements
  39                         text: "'text'==a.type",
  40                         radio: "'radio'==a.type",
  41                         checkbox: "'checkbox'==a.type",
  42                         file: "'file'==a.type",
  43                         password: "'password'==a.type",
  44                         submit: "'submit'==a.type",
  45                         image: "'image'==a.type",
  46                         reset: "'reset'==a.type",
  47                         button: '"button"==a.type||jQuery.nodeName(a,"button")',
  48                         input: "/input|select|textarea|button/i.test(a.nodeName)"
  49                 },
  50                 "[": "jQuery.find(m[2],a).length"
  51         },
  52
  53         // The regular expressions that power the parsing engine
  54         parse: [
  55                 // Match: [@value='test'], [@foo]
  56                 /^\[ *(@)([\w-]+) *([!*$^~=]*) *('?"?)(.*?)\4 *\]/,
  57
  58                 // Match: [div], [div p]
  59                 /^(\[)\s*(.*?(\[.*?\])?[^[]*?)\s*\]/,
  60
  61                 // Match: :contains('foo')
  62                 /^(:)([\w-]+)\("?'?(.*?(\(.*?\))?[^(]*?)"?'?\)/,
  63
  64                 // Match: :even, :last-chlid, #id, .class
  65                 new RegExp("^([:.#]*)(" +
  66                         ( jQuery.chars = jQuery.browser.safari && jQuery.browser.version < "3.0.0" ? "\\w" : "(?:[\\w\u0128-\uFFFF*_-]|\\\\.)" ) + "+)")
  67         ],
  68
  69         multiFilter: function( expr, elems, not ) {
  70                 var old, cur = [];
  71
  72                 while ( expr && expr != old ) {
  73                         old = expr;
  74                         var f = jQuery.filter( expr, elems, not );
  75                         expr = f.t.replace(/^\s*,\s*/, "" );
  76                         cur = not ? elems = f.r : jQuery.merge( cur, f.r );
  77                 }
  78
  79                 return cur;
  80         },
  81
  82         /**
  83          * @name $.find
  84          * @type Array<Element>
  85          * @private
  86          * @cat Core
  87          */
  88         find: function( t, context ) {
  89                 // Quickly handle non-string expressions
  90                 if ( typeof t != "string" )
  91                         return [ t ];
  92
  93                 // Make sure that the context is a DOM Element
  94                 if ( context && !context.nodeType )
  95                         context = null;
  96
  97                 // Set the correct context (if none is provided)
  98                 context = context || document;
  99
 100                 // Handle the common XPath // expression
 101                 if ( !t.indexOf("//") ) {
 102                         context = context.documentElement;
 103                         t = t.substr(2,t.length);
 104
 105                 // And the / root expression
 106                 } else if ( !t.indexOf("/") && !context.ownerDocument ) {
 107                         context = context.documentElement;
 108                         t = t.substr(1,t.length);
 109                         if ( t.indexOf("/") >= 1 )
 110                                 t = t.substr(t.indexOf("/"),t.length);
 111                 }
 112
 113                 // Initialize the search
 114                 var ret = [context], done = [], last;
 115
 116                 // Continue while a selector expression exists, and while
 117                 // we're no longer looping upon ourselves
 118                 while ( t && last != t ) {
 119                         var r = [];
 120                         last = t;
 121
 122                         t = jQuery.trim(t).replace( /^\/\//, "" );
 123
 124                         var foundToken = false;
 125
 126                         // An attempt at speeding up child selectors that
 127                         // point to a specific element tag
 128                         var re = new RegExp("^[/>]\\s*(" + jQuery.chars + "+)");
 129                         var m = re.exec(t);
 130
 131                         if ( m ) {
 132                                 var nodeName = m[1].toUpperCase();
 133
 134                                 // Perform our own iteration and filter
 135                                 for ( var i = 0; ret[i]; i++ )
 136                                         for ( var c = ret[i].firstChild; c; c = c.nextSibling )
 137                                                 if ( c.nodeType == 1 && (nodeName == "*" || c.nodeName.toUpperCase() == nodeName.toUpperCase()) )
 138                                                         r.push( c );
 139
 140                                 ret = r;
 141                                 t = t.replace( re, "" );
 142                                 if ( t.indexOf(" ") == 0 ) continue;
 143                                 foundToken = true;
 144                         } else {
 145                                 re = /^((\/?\.\.)|([>\/+~]))\s*([a-z]*)/i;
 146
 147                                 if ( (m = re.exec(t)) != null ) {
 148                                         r = [];
 149
 150                                         var nodeName = m[4], mergeNum = jQuery.mergeNum++;
 151                                         m = m[1];
 152
 153                                         for ( var j = 0, rl = ret.length; j < rl; j++ )
 154                                                 if ( m.indexOf("..") < 0 ) {
 155                                                         var n = m == "~" || m == "+" ? ret[j].nextSibling : ret[j].firstChild;
 156                                                         for ( ; n; n = n.nextSibling )
 157                                                                 if ( n.nodeType == 1 ) {
 158                                                                         if ( m == "~" && n.mergeNum == mergeNum ) break;
 159
 160                                                                         if (!nodeName || n.nodeName.toUpperCase() == nodeName.toUpperCase() ) {
 161                                                                                 if ( m == "~" ) n.mergeNum = mergeNum;
 162                                                                                 r.push( n );
 163                                                                         }
 164
 165                                                                         if ( m == "+" ) break;
 166                                                                 }
 167                                                 } else
 168                                                         r.push( ret[j].parentNode );
 169
 170                                         ret = r;
 171
 172                                         // And remove the token
 173                                         t = jQuery.trim( t.replace( re, "" ) );
 174                                         foundToken = true;
 175                                 }
 176                         }
 177
 178                         // See if there's still an expression, and that we haven't already
 179                         // matched a token
 180                         if ( t && !foundToken ) {
 181                                 // Handle multiple expressions
 182                                 if ( !t.indexOf(",") ) {
 183                                         // Clean the result set
 184                                         if ( context == ret[0] ) ret.shift();
 185
 186                                         // Merge the result sets
 187                                         done = jQuery.merge( done, ret );
 188
 189                                         // Reset the context
 190                                         r = ret = [context];
 191
 192                                         // Touch up the selector string
 193                                         t = " " + t.substr(1,t.length);
 194
 195                                 } else {
 196                                         // Optimize for the case nodeName#idName
 197                                         var re2 = new RegExp("^(" + jQuery.chars + "+)(#)(" + jQuery.chars + "+)");
 198                                         var m = re2.exec(t);
 199
 200                                         // Re-organize the results, so that they're consistent
 201                                         if ( m ) {
 202                                            m = [ 0, m[2], m[3], m[1] ];
 203
 204                                         } else {
 205                                                 // Otherwise, do a traditional filter check for
 206                                                 // ID, class, and element selectors
 207                                                 re2 = new RegExp("^([#.]?)(" + jQuery.chars + "*)");
 208                                                 m = re2.exec(t);
 209                                         }
 210
 211                                         m[2] = m[2].replace(/\\/g, "");
 212
 213                                         var elem = ret[ret.length-1];
 214
 215                                         // Try to do a global search by ID, where we can
 216                                         if ( m[1] == "#" && elem && elem.getElementById ) {
 217                                                 // Optimization for HTML document case
 218                                                 var oid = elem.getElementById(m[2]);
 219
 220                                                 // Do a quick check for the existence of the actual ID attribute
 221                                                 // to avoid selecting by the name attribute in IE
 222                                                 // also check to insure id is a string to avoid selecting an element with the name of 'id' inside a form
 223                                                 if ( (jQuery.browser.msie||jQuery.browser.opera) && oid && typeof oid.id == "string" && oid.id != m[2] )
 224                                                         oid = jQuery('[@id="'+m[2]+'"]', elem)[0];
 225
 226                                                 // Do a quick check for node name (where applicable) so
 227                                                 // that div#foo searches will be really fast
 228                                                 ret = r = oid && (!m[3] || jQuery.nodeName(oid, m[3])) ? [oid] : [];
 229                                         } else {
 230                                                 // We need to find all descendant elements
 231                                                 for ( var i = 0; ret[i]; i++ ) {
 232                                                         // Grab the tag name being searched for
 233                                                         var tag = m[1] != "" || m[0] == "" ? "*" : m[2];
 234
 235                                                         // Handle IE7 being really dumb about <object>s
 236                                                         if ( tag == "*" && ret[i].nodeName.toLowerCase() == "object" )
 237                                                                 tag = "param";
 238
 239                                                         r = jQuery.merge( r, ret[i].getElementsByTagName( tag ));
 240                                                 }
 241
 242                                                 // It's faster to filter by class and be done with it
 243                                                 if ( m[1] == "." )
 244                                                         r = jQuery.classFilter( r, m[2] );
 245
 246                                                 // Same with ID filtering
 247                                                 if ( m[1] == "#" ) {
 248                                                         var tmp = [];
 249
 250                                                         // Try to find the element with the ID
 251                                                         for ( var i = 0; r[i]; i++ )
 252                                                                 if ( r[i].getAttribute("id") == m[2] ) {
 253                                                                         tmp = [ r[i] ];
 254                                                                         break;
 255                                                                 }
 256
 257                                                         r = tmp;
 258                                                 }
 259
 260                                                 ret = r;
 261                                         }
 262
 263                                         t = t.replace( re2, "" );
 264                                 }
 265
 266                         }
 267
 268                         // If a selector string still exists
 269                         if ( t ) {
 270                                 // Attempt to filter it
 271                                 var val = jQuery.filter(t,r);
 272                                 ret = r = val.r;
 273                                 t = jQuery.trim(val.t);
 274                         }
 275                 }
 276
 277                 // An error occurred with the selector;
 278                 // just return an empty set instead
 279                 if ( t )
 280                         ret = [];
 281
 282                 // Remove the root context
 283                 if ( ret && context == ret[0] )
 284                         ret.shift();
 285
 286                 // And combine the results
 287                 done = jQuery.merge( done, ret );
 288
 289                 return done;
 290         },
 291
 292         classFilter: function(r,m,not){
 293                 m = " " + m + " ";
 294                 var tmp = [];
 295                 for ( var i = 0; r[i]; i++ ) {
 296                         var pass = (" " + r[i].className + " ").indexOf( m ) >= 0;
 297                         if ( !not && pass || not && !pass )
 298                                 tmp.push( r[i] );
 299                 }
 300                 return tmp;
 301         },
 302
 303         filter: function(t,r,not) {
 304                 var last;
 305
 306                 // Look for common filter expressions
 307                 while ( t  && t != last ) {
 308                         last = t;
 309
 310                         var p = jQuery.parse, m;
 311
 312                         for ( var i = 0; p[i]; i++ ) {
 313                                 m = p[i].exec( t );
 314
 315                                 if ( m ) {
 316                                         // Remove what we just matched
 317                                         t = t.substring( m[0].length );
 318
 319                                         m[2] = m[2].replace(/\\/g, "");
 320                                         break;
 321                                 }
 322                         }
 323
 324                         if ( !m )
 325                                 break;
 326
 327                         // :not() is a special case that can be optimized by
 328                         // keeping it out of the expression list
 329                         if ( m[1] == ":" && m[2] == "not" )
 330                                 r = jQuery.filter(m[3], r, true).r;
 331
 332                         // We can get a big speed boost by filtering by class here
 333                         else if ( m[1] == "." )
 334                                 r = jQuery.classFilter(r, m[2], not);
 335
 336                         else if ( m[1] == "@" ) {
 337                                 var tmp = [], type = m[3];
 338
 339                                 for ( var i = 0, rl = r.length; i < rl; i++ ) {
 340                                         var a = r[i], z = a[ jQuery.props[m[2]] || m[2] ];
 341
 342                                         if ( z == null || /href|src/.test(m[2]) )
 343                                                 z = jQuery.attr(a,m[2]) || '';
 344
 345                                         if ( (type == "" && !!z ||
 346                                                  type == "=" && z == m[5] ||
 347                                                  type == "!=" && z != m[5] ||
 348                                                  type == "^=" && z && !z.indexOf(m[5]) ||
 349                                                  type == "$=" && z.substr(z.length - m[5].length) == m[5] ||
 350                                                  (type == "*=" || type == "~=") && z.indexOf(m[5]) >= 0) ^ not )
 351                                                         tmp.push( a );
 352                                 }
 353
 354                                 r = tmp;
 355
 356                         // We can get a speed boost by handling nth-child here
 357                         } else if ( m[1] == ":" && m[2] == "nth-child" ) {
 358                                 var num = jQuery.mergeNum++, tmp = [],
 359                                         test = /(\d*)n\+?(\d*)/.exec(
 360                                                 m[3] == "even" && "2n" || m[3] == "odd" && "2n+1" ||
 361                                                 !/\D/.test(m[3]) && "n+" + m[3] || m[3]),
 362                                         first = (test[1] || 1) - 0, last = test[2] - 0;
 363
 364                                 for ( var i = 0, rl = r.length; i < rl; i++ ) {
 365                                         var node = r[i], parentNode = node.parentNode;
 366
 367                                         if ( num != parentNode.mergeNum ) {
 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                                                 parentNode.mergeNum = num;
 375                                         }
 376
 377                                         var add = false;
 378
 379                                         if ( first == 1 ) {
 380                                                 if ( last == 0 || node.nodeIndex == last )
 381                                                         add = true;
 382                                         } else if ( (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 f = jQuery.expr[m[1]];
 394                                 if ( typeof f != "string" )
 395                                         f = jQuery.expr[m[1]][m[2]];
 396
 397                                 // Build a custom macro to enclose it
 398                                 eval("f = function(a,i){return " + f + "}");
 399
 400                                 // Execute it against the current filter
 401                                 r = jQuery.grep( r, f, not );
 402                         }
 403                 }
 404
 405                 // Return an array of filtered elements (r)
 406                 // and the modified expression string (t)
 407                 return { r: r, t: t };
 408         },
 409
 410         /**
 411          * All ancestors of a given element.
 412          *
 413          * @private
 414          * @name $.parents
 415          * @type Array<Element>
 416          * @param Element elem The element to find the ancestors of.
 417          * @cat DOM/Traversing
 418          */
 419         parents: function( elem ){
 420                 var matched = [];
 421                 var cur = elem.parentNode;
 422                 while ( cur && cur != document ) {
 423                         matched.push( cur );
 424                         cur = cur.parentNode;
 425                 }
 426                 return matched;
 427         },
 428
 429         /**
 430          * A handy, and fast, way to traverse in a particular direction and find
 431          * a specific element.
 432          *
 433          * @private
 434          * @name $.nth
 435          * @type DOMElement
 436          * @param DOMElement cur The element to search from.
 437          * @param String|Number num The Nth result to match. Can be a number or a string (like 'even' or 'odd').
 438          * @param String dir The direction to move in (pass in something like 'previousSibling' or 'nextSibling').
 439          * @cat DOM/Traversing
 440          */
 441         nth: function(cur,result,dir,elem){
 442                 result = result || 1;
 443                 var num = 0;
 444
 445                 for ( ; cur; cur = cur[dir] )
 446                         if ( cur.nodeType == 1 && ++num == result )
 447                                 break;
 448
 449                 return cur;
 450         },
 451
 452         /**
 453          * All elements on a specified axis.
 454          *
 455          * @private
 456          * @name $.sibling
 457          * @type Array
 458          * @param Element elem The element to find all the siblings of (including itself).
 459          * @cat DOM/Traversing
 460          */
 461         sibling: function( n, elem ) {
 462                 var r = [];
 463
 464                 for ( ; n; n = n.nextSibling ) {
 465                         if ( n.nodeType == 1 && (!elem || n != elem) )
 466                                 r.push( n );
 467                 }
 468
 469                 return r;
 470         }
 471 });