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                 "[": "jQuery.find(m[2],a).length"
  62         },
  63
  64         // The regular expressions that power the parsing engine
  65         parse: [
  66                 // Match: [@value='test'], [@foo]
  67                 /^\[ *(@)([\w-]+) *([!*$^~=]*) *('?"?)(.*?)\4 *\]/,
  68
  69                 // Match: [div], [div p]
  70                 /^(\[)\s*(.*?(\[.*?\])?[^[]*?)\s*\]/,
  71
  72                 // Match: :contains('foo')
  73                 /^(:)([\w-]+)\("?'?(.*?(\(.*?\))?[^(]*?)"?'?\)/,
  74
  75                 // Match: :even, :last-chlid, #id, .class
  76                 new RegExp("^([:.#]*)(" + chars + "+)")
  77         ],
  78
  79         multiFilter: function( expr, elems, not ) {
  80                 var old, cur = [];
  81
  82                 while ( expr && expr != old ) {
  83                         old = expr;
  84                         var f = jQuery.filter( expr, elems, not );
  85                         expr = f.t.replace(/^\s*,\s*/, "" );
  86                         cur = not ? elems = f.r : jQuery.merge( cur, f.r );
  87                 }
  88
  89                 return cur;
  90         },
  91
  92         /**
  93          * @name $.find
  94          * @type Array<Element>
  95          * @private
  96          * @cat Core
  97          */
  98         find: function( t, context ) {
  99                 // Quickly handle non-string expressions
 100                 if ( typeof t != "string" )
 101                         return [ t ];
 102
 103                 // Make sure that the context is a DOM Element
 104                 if ( context && !context.nodeType )
 105                         context = null;
 106
 107                 // Set the correct context (if none is provided)
 108                 context = context || document;
 109
 110                 // Handle the common XPath // expression
 111                 if ( !t.indexOf("//") ) {
 112                         //context = context.documentElement;
 113                         t = t.substr(2,t.length);
 114
 115                 // And the / root expression
 116                 } else if ( !t.indexOf("/") && !context.ownerDocument ) {
 117                         context = context.documentElement;
 118                         t = t.substr(1,t.length);
 119                         if ( t.indexOf("/") >= 1 )
 120                                 t = t.substr(t.indexOf("/"),t.length);
 121                 }
 122
 123                 // Initialize the search
 124                 var ret = [context], done = [], last;
 125
 126                 // Continue while a selector expression exists, and while
 127                 // we're no longer looping upon ourselves
 128                 while ( t && last != t ) {
 129                         var r = [];
 130                         last = t;
 131
 132                         t = jQuery.trim(t).replace( /^\/\//, "" );
 133
 134                         var foundToken = false;
 135
 136                         // An attempt at speeding up child selectors that
 137                         // point to a specific element tag
 138                         var re = quickChild;
 139                         var m = re.exec(t);
 140
 141                         if ( m ) {
 142                                 var nodeName = m[1].toUpperCase();
 143
 144                                 // Perform our own iteration and filter
 145                                 for ( var i = 0; ret[i]; i++ )
 146                                         for ( var c = ret[i].firstChild; c; c = c.nextSibling )
 147                                                 if ( c.nodeType == 1 && (nodeName == "*" || c.nodeName.toUpperCase() == nodeName.toUpperCase()) )
 148                                                         r.push( c );
 149
 150                                 ret = r;
 151                                 t = t.replace( re, "" );
 152                                 if ( t.indexOf(" ") == 0 ) continue;
 153                                 foundToken = true;
 154                         } else {
 155                                 re = /^((\/?\.\.)|([>\/+~]))\s*(\w*)/i;
 156
 157                                 if ( (m = re.exec(t)) != null ) {
 158                                         r = [];
 159
 160                                         var nodeName = m[4], mergeNum = jQuery.mergeNum++;
 161                                         m = m[1];
 162
 163                                         for ( var j = 0, rl = ret.length; j < rl; j++ )
 164                                                 if ( m.indexOf("..") < 0 ) {
 165                                                         var n = m == "~" || m == "+" ? ret[j].nextSibling : ret[j].firstChild;
 166                                                         for ( ; n; n = n.nextSibling )
 167                                                                 if ( n.nodeType == 1 ) {
 168                                                                         if ( m == "~" && n.mergeNum == mergeNum ) break;
 169
 170                                                                         if (!nodeName || n.nodeName.toUpperCase() == nodeName.toUpperCase() ) {
 171                                                                                 if ( m == "~" ) n.mergeNum = mergeNum;
 172                                                                                 r.push( n );
 173                                                                         }
 174
 175                                                                         if ( m == "+" ) break;
 176                                                                 }
 177                                                 } else
 178                                                         r.push( ret[j].parentNode );
 179
 180                                         ret = r;
 181
 182                                         // And remove the token
 183                                         t = jQuery.trim( t.replace( re, "" ) );
 184                                         foundToken = true;
 185                                 }
 186                         }
 187
 188                         // See if there's still an expression, and that we haven't already
 189                         // matched a token
 190                         if ( t && !foundToken ) {
 191                                 // Handle multiple expressions
 192                                 if ( !t.indexOf(",") ) {
 193                                         // Clean the result set
 194                                         if ( context == ret[0] ) ret.shift();
 195
 196                                         // Merge the result sets
 197                                         done = jQuery.merge( done, ret );
 198
 199                                         // Reset the context
 200                                         r = ret = [context];
 201
 202                                         // Touch up the selector string
 203                                         t = " " + t.substr(1,t.length);
 204
 205                                 } else {
 206                                         // Optimize for the case nodeName#idName
 207                                         var re2 = quickID;
 208                                         var m = re2.exec(t);
 209
 210                                         // Re-organize the results, so that they're consistent
 211                                         if ( m ) {
 212                                            m = [ 0, m[2], m[3], m[1] ];
 213
 214                                         } else {
 215                                                 // Otherwise, do a traditional filter check for
 216                                                 // ID, class, and element selectors
 217                                                 re2 = quickClass;
 218                                                 m = re2.exec(t);
 219                                         }
 220
 221                                         m[2] = m[2].replace(/\\/g, "");
 222
 223                                         var elem = ret[ret.length-1];
 224
 225                                         // Try to do a global search by ID, where we can
 226                                         if ( m[1] == "#" && elem && elem.getElementById && !jQuery.isXMLDoc(elem) ) {
 227                                                 // Optimization for HTML document case
 228                                                 var oid = elem.getElementById(m[2]);
 229
 230                                                 // Do a quick check for the existence of the actual ID attribute
 231                                                 // to avoid selecting by the name attribute in IE
 232                                                 // also check to insure id is a string to avoid selecting an element with the name of 'id' inside a form
 233                                                 if ( (jQuery.browser.msie||jQuery.browser.opera) && oid && typeof oid.id == "string" && oid.id != m[2] )
 234                                                         oid = jQuery('[@id="'+m[2]+'"]', elem)[0];
 235
 236                                                 // Do a quick check for node name (where applicable) so
 237                                                 // that div#foo searches will be really fast
 238                                                 ret = r = oid && (!m[3] || jQuery.nodeName(oid, m[3])) ? [oid] : [];
 239                                         } else {
 240                                                 // We need to find all descendant elements
 241                                                 for ( var i = 0; ret[i]; i++ ) {
 242                                                         // Grab the tag name being searched for
 243                                                         var tag = m[1] != "" || m[0] == "" ? "*" : m[2];
 244
 245                                                         // Handle IE7 being really dumb about <object>s
 246                                                         if ( tag == "*" && ret[i].nodeName.toLowerCase() == "object" )
 247                                                                 tag = "param";
 248
 249                                                         r = jQuery.merge( r, ret[i].getElementsByTagName( tag ));
 250                                                 }
 251
 252                                                 // It's faster to filter by class and be done with it
 253                                                 if ( m[1] == "." )
 254                                                         r = jQuery.classFilter( r, m[2] );
 255
 256                                                 // Same with ID filtering
 257                                                 if ( m[1] == "#" ) {
 258                                                         var tmp = [];
 259
 260                                                         // Try to find the element with the ID
 261                                                         for ( var i = 0; r[i]; i++ )
 262                                                                 if ( r[i].getAttribute("id") == m[2] ) {
 263                                                                         tmp = [ r[i] ];
 264                                                                         break;
 265                                                                 }
 266
 267                                                         r = tmp;
 268                                                 }
 269
 270                                                 ret = r;
 271                                         }
 272
 273                                         t = t.replace( re2, "" );
 274                                 }
 275
 276                         }
 277
 278                         // If a selector string still exists
 279                         if ( t ) {
 280                                 // Attempt to filter it
 281                                 var val = jQuery.filter(t,r);
 282                                 ret = r = val.r;
 283                                 t = jQuery.trim(val.t);
 284                         }
 285                 }
 286
 287                 // An error occurred with the selector;
 288                 // just return an empty set instead
 289                 if ( t )
 290                         ret = [];
 291
 292                 // Remove the root context
 293                 if ( ret && context == ret[0] )
 294                         ret.shift();
 295
 296                 // And combine the results
 297                 done = jQuery.merge( done, ret );
 298
 299                 return done;
 300         },
 301
 302         classFilter: function(r,m,not){
 303                 m = " " + m + " ";
 304                 var tmp = [];
 305                 for ( var i = 0; r[i]; i++ ) {
 306                         var pass = (" " + r[i].className + " ").indexOf( m ) >= 0;
 307                         if ( !not && pass || not && !pass )
 308                                 tmp.push( r[i] );
 309                 }
 310                 return tmp;
 311         },
 312
 313         filter: function(t,r,not) {
 314                 var last;
 315
 316                 // Look for common filter expressions
 317                 while ( t  && t != last ) {
 318                         last = t;
 319
 320                         var p = jQuery.parse, m;
 321
 322                         for ( var i = 0; p[i]; i++ ) {
 323                                 m = p[i].exec( t );
 324
 325                                 if ( m ) {
 326                                         // Remove what we just matched
 327                                         t = t.substring( m[0].length );
 328
 329                                         m[2] = m[2].replace(/\\/g, "");
 330                                         break;
 331                                 }
 332                         }
 333
 334                         if ( !m )
 335                                 break;
 336
 337                         // :not() is a special case that can be optimized by
 338                         // keeping it out of the expression list
 339                         if ( m[1] == ":" && m[2] == "not" )
 340                                 r = jQuery.filter(m[3], r, true).r;
 341
 342                         // We can get a big speed boost by filtering by class here
 343                         else if ( m[1] == "." )
 344                                 r = jQuery.classFilter(r, m[2], not);
 345
 346                         else if ( m[1] == "@" ) {
 347                                 var tmp = [], type = m[3];
 348
 349                                 for ( var i = 0, rl = r.length; i < rl; i++ ) {
 350                                         var a = r[i], z = a[ jQuery.props[m[2]] || m[2] ];
 351
 352                                         if ( z == null || /href|src|selected/.test(m[2]) )
 353                                                 z = jQuery.attr(a,m[2]) || '';
 354
 355                                         if ( (type == "" && !!z ||
 356                                                  type == "=" && z == m[5] ||
 357                                                  type == "!=" && z != m[5] ||
 358                                                  type == "^=" && z && !z.indexOf(m[5]) ||
 359                                                  type == "$=" && z.substr(z.length - m[5].length) == m[5] ||
 360                                                  (type == "*=" || type == "~=") && z.indexOf(m[5]) >= 0) ^ not )
 361                                                         tmp.push( a );
 362                                 }
 363
 364                                 r = tmp;
 365
 366                         // We can get a speed boost by handling nth-child here
 367                         } else if ( m[1] == ":" && m[2] == "nth-child" ) {
 368                                 var num = jQuery.mergeNum++, tmp = [],
 369                                         test = /(\d*)n\+?(\d*)/.exec(
 370                                                 m[3] == "even" && "2n" || m[3] == "odd" && "2n+1" ||
 371                                                 !/\D/.test(m[3]) && "n+" + m[3] || m[3]),
 372                                         first = (test[1] || 1) - 0, last = test[2] - 0;
 373
 374                                 for ( var i = 0, rl = r.length; i < rl; i++ ) {
 375                                         var node = r[i], parentNode = node.parentNode;
 376
 377                                         if ( num != parentNode.mergeNum ) {
 378                                                 var c = 1;
 379
 380                                                 for ( var n = parentNode.firstChild; n; n = n.nextSibling )
 381                                                         if ( n.nodeType == 1 )
 382                                                                 n.nodeIndex = c++;
 383
 384                                                 parentNode.mergeNum = num;
 385                                         }
 386
 387                                         var add = false;
 388
 389                                         if ( first == 1 ) {
 390                                                 if ( last == 0 || node.nodeIndex == last )
 391                                                         add = true;
 392                                         } else if ( (node.nodeIndex + last) % first == 0 )
 393                                                 add = true;
 394
 395                                         if ( add ^ not )
 396                                                 tmp.push( node );
 397                                 }
 398
 399                                 r = tmp;
 400
 401                         // Otherwise, find the expression to execute
 402                         } else {
 403                                 var f = jQuery.expr[m[1]];
 404                                 if ( typeof f != "string" )
 405                                         f = jQuery.expr[m[1]][m[2]];
 406
 407                                 // Build a custom macro to enclose it
 408                                 eval("f = function(a,i){return " + f + "}");
 409
 410                                 // Execute it against the current filter
 411                                 r = jQuery.grep( r, f, not );
 412                         }
 413                 }
 414
 415                 // Return an array of filtered elements (r)
 416                 // and the modified expression string (t)
 417                 return { r: r, t: t };
 418         },
 419
 420         /**
 421          * All ancestors of a given element.
 422          *
 423          * @private
 424          * @name $.parents
 425          * @type Array<Element>
 426          * @param Element elem The element to find the ancestors of.
 427          * @cat DOM/Traversing
 428          */
 429         parents: function( elem ){
 430                 var matched = [];
 431                 var cur = elem.parentNode;
 432                 while ( cur && cur != document ) {
 433                         matched.push( cur );
 434                         cur = cur.parentNode;
 435                 }
 436                 return matched;
 437         },
 438
 439         /**
 440          * A handy, and fast, way to traverse in a particular direction and find
 441          * a specific element.
 442          *
 443          * @private
 444          * @name $.nth
 445          * @type DOMElement
 446          * @param DOMElement cur The element to search from.
 447          * @param String|Number num The Nth result to match. Can be a number or a string (like 'even' or 'odd').
 448          * @param String dir The direction to move in (pass in something like 'previousSibling' or 'nextSibling').
 449          * @cat DOM/Traversing
 450          */
 451         nth: function(cur,result,dir,elem){
 452                 result = result || 1;
 453                 var num = 0;
 454
 455                 for ( ; cur; cur = cur[dir] )
 456                         if ( cur.nodeType == 1 && ++num == result )
 457                                 break;
 458
 459                 return cur;
 460         },
 461
 462         /**
 463          * All elements on a specified axis.
 464          *
 465          * @private
 466          * @name $.sibling
 467          * @type Array
 468          * @param Element elem The element to find all the siblings of (including itself).
 469          * @cat DOM/Traversing
 470          */
 471         sibling: function( n, elem ) {
 472                 var r = [];
 473
 474                 for ( ; n; n = n.nextSibling ) {
 475                         if ( n.nodeType == 1 && (!elem || n != elem) )
 476                                 r.push( n );
 477                 }
 478
 479                 return r;
 480         }
 481 });