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                 // DEPRECATED
  62                 "[": "jQuery.find(m[2],a).length"
  63         },
  64
  65         // The regular expressions that power the parsing engine
  66         parse: [
  67                 // Match: [@value='test'], [@foo]
  68                 /^\[ *(@)([\w-]+) *([!*$^~=]*) *('?"?)(.*?)\4 *\]/,
  69
  70                 // DEPRECATED
  71                 // Match: [div], [div p]
  72                 /^(\[)\s*(.*?(\[.*?\])?[^[]*?)\s*\]/,
  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         /**
  95          * @name $.find
  96          * @type Array<Element>
  97          * @private
  98          * @cat Core
  99          */
 100         find: function( t, context ) {
 101                 // Quickly handle non-string expressions
 102                 if ( typeof t != "string" )
 103                         return [ t ];
 104
 105                 // Make sure that the context is a DOM Element
 106                 if ( context && !context.nodeType )
 107                         context = null;
 108
 109                 // Set the correct context (if none is provided)
 110                 context = context || document;
 111
 112                 // DEPRECATED
 113                 // Handle the common XPath // expression
 114                 if ( !t.indexOf("//") ) {
 115                         //context = context.documentElement;
 116                         t = t.substr(2,t.length);
 117
 118                 // DEPRECATED
 119                 // And the / root expression
 120                 } else if ( !t.indexOf("/") && !context.ownerDocument ) {
 121                         context = context.documentElement;
 122                         t = t.substr(1,t.length);
 123                         if ( t.indexOf("/") >= 1 )
 124                                 t = t.substr(t.indexOf("/"),t.length);
 125                 }
 126
 127                 // Initialize the search
 128                 var ret = [context], done = [], last;
 129
 130                 // Continue while a selector expression exists, and while
 131                 // we're no longer looping upon ourselves
 132                 while ( t && last != t ) {
 133                         var r = [];
 134                         last = t;
 135
 136                         // DEPRECATED
 137                         t = jQuery.trim(t).replace( /^\/\//, "" );
 138
 139                         var foundToken = false;
 140
 141                         // An attempt at speeding up child selectors that
 142                         // point to a specific element tag
 143                         var re = quickChild;
 144                         var m = re.exec(t);
 145
 146                         if ( m ) {
 147                                 var nodeName = m[1].toUpperCase();
 148
 149                                 // Perform our own iteration and filter
 150                                 for ( var i = 0; ret[i]; i++ )
 151                                         for ( var c = ret[i].firstChild; c; c = c.nextSibling )
 152                                                 if ( c.nodeType == 1 && (nodeName == "*" || c.nodeName.toUpperCase() == nodeName.toUpperCase()) )
 153                                                         r.push( c );
 154
 155                                 ret = r;
 156                                 t = t.replace( re, "" );
 157                                 if ( t.indexOf(" ") == 0 ) continue;
 158                                 foundToken = true;
 159                         } else {
 160                                 // (.. and /) DEPRECATED
 161                                 re = /^((\/?\.\.)|([>\/+~]))\s*(\w*)/i;
 162
 163                                 if ( (m = re.exec(t)) != null ) {
 164                                         r = [];
 165
 166                                         var nodeName = m[4], mergeNum = jQuery.mergeNum++;
 167                                         m = m[1];
 168
 169                                         for ( var j = 0, rl = ret.length; j < rl; j++ )
 170                                                 if ( m.indexOf("..") < 0 ) {
 171                                                         var n = m == "~" || m == "+" ? ret[j].nextSibling : ret[j].firstChild;
 172                                                         for ( ; n; n = n.nextSibling )
 173                                                                 if ( n.nodeType == 1 ) {
 174                                                                         if ( m == "~" && n.mergeNum == mergeNum ) break;
 175
 176                                                                         if (!nodeName || n.nodeName.toUpperCase() == nodeName.toUpperCase() ) {
 177                                                                                 if ( m == "~" ) n.mergeNum = mergeNum;
 178                                                                                 r.push( n );
 179                                                                         }
 180
 181                                                                         if ( m == "+" ) break;
 182                                                                 }
 183                                                 // DEPRECATED
 184                                                 } else
 185                                                         r.push( ret[j].parentNode );
 186
 187                                         ret = r;
 188
 189                                         // And remove the token
 190                                         t = jQuery.trim( t.replace( re, "" ) );
 191                                         foundToken = true;
 192                                 }
 193                         }
 194
 195                         // See if there's still an expression, and that we haven't already
 196                         // matched a token
 197                         if ( t && !foundToken ) {
 198                                 // Handle multiple expressions
 199                                 if ( !t.indexOf(",") ) {
 200                                         // Clean the result set
 201                                         if ( context == ret[0] ) ret.shift();
 202
 203                                         // Merge the result sets
 204                                         done = jQuery.merge( done, ret );
 205
 206                                         // Reset the context
 207                                         r = ret = [context];
 208
 209                                         // Touch up the selector string
 210                                         t = " " + t.substr(1,t.length);
 211
 212                                 } else {
 213                                         // Optimize for the case nodeName#idName
 214                                         var re2 = quickID;
 215                                         var m = re2.exec(t);
 216
 217                                         // Re-organize the results, so that they're consistent
 218                                         if ( m ) {
 219                                            m = [ 0, m[2], m[3], m[1] ];
 220
 221                                         } else {
 222                                                 // Otherwise, do a traditional filter check for
 223                                                 // ID, class, and element selectors
 224                                                 re2 = quickClass;
 225                                                 m = re2.exec(t);
 226                                         }
 227
 228                                         m[2] = m[2].replace(/\\/g, "");
 229
 230                                         var elem = ret[ret.length-1];
 231
 232                                         // Try to do a global search by ID, where we can
 233                                         if ( m[1] == "#" && elem && elem.getElementById && !jQuery.isXMLDoc(elem) ) {
 234                                                 // Optimization for HTML document case
 235                                                 var oid = elem.getElementById(m[2]);
 236
 237                                                 // Do a quick check for the existence of the actual ID attribute
 238                                                 // to avoid selecting by the name attribute in IE
 239                                                 // also check to insure id is a string to avoid selecting an element with the name of 'id' inside a form
 240                                                 if ( (jQuery.browser.msie||jQuery.browser.opera) && oid && typeof oid.id == "string" && oid.id != m[2] )
 241                                                         oid = jQuery('[@id="'+m[2]+'"]', elem)[0];
 242
 243                                                 // Do a quick check for node name (where applicable) so
 244                                                 // that div#foo searches will be really fast
 245                                                 ret = r = oid && (!m[3] || jQuery.nodeName(oid, m[3])) ? [oid] : [];
 246                                         } else {
 247                                                 // We need to find all descendant elements
 248                                                 for ( var i = 0; ret[i]; i++ ) {
 249                                                         // Grab the tag name being searched for
 250                                                         var tag = m[1] == "#" && m[3] ? m[3] : m[1] != "" || m[0] == "" ? "*" : m[2];
 251
 252                                                         // Handle IE7 being really dumb about <object>s
 253                                                         if ( tag == "*" && ret[i].nodeName.toLowerCase() == "object" )
 254                                                                 tag = "param";
 255
 256                                                         r = jQuery.merge( r, ret[i].getElementsByTagName( tag ));
 257                                                 }
 258
 259                                                 // It's faster to filter by class and be done with it
 260                                                 if ( m[1] == "." )
 261                                                         r = jQuery.classFilter( r, m[2] );
 262
 263                                                 // Same with ID filtering
 264                                                 if ( m[1] == "#" ) {
 265                                                         var tmp = [];
 266
 267                                                         // Try to find the element with the ID
 268                                                         for ( var i = 0; r[i]; i++ )
 269                                                                 if ( r[i].getAttribute("id") == m[2] ) {
 270                                                                         tmp = [ r[i] ];
 271                                                                         break;
 272                                                                 }
 273
 274                                                         r = tmp;
 275                                                 }
 276
 277                                                 ret = r;
 278                                         }
 279
 280                                         t = t.replace( re2, "" );
 281                                 }
 282
 283                         }
 284
 285                         // If a selector string still exists
 286                         if ( t ) {
 287                                 // Attempt to filter it
 288                                 var val = jQuery.filter(t,r);
 289                                 ret = r = val.r;
 290                                 t = jQuery.trim(val.t);
 291                         }
 292                 }
 293
 294                 // An error occurred with the selector;
 295                 // just return an empty set instead
 296                 if ( t )
 297                         ret = [];
 298
 299                 // Remove the root context
 300                 if ( ret && context == ret[0] )
 301                         ret.shift();
 302
 303                 // And combine the results
 304                 done = jQuery.merge( done, ret );
 305
 306                 return done;
 307         },
 308
 309         classFilter: function(r,m,not){
 310                 m = " " + m + " ";
 311                 var tmp = [];
 312                 for ( var i = 0; r[i]; i++ ) {
 313                         var pass = (" " + r[i].className + " ").indexOf( m ) >= 0;
 314                         if ( !not && pass || not && !pass )
 315                                 tmp.push( r[i] );
 316                 }
 317                 return tmp;
 318         },
 319
 320         filter: function(t,r,not) {
 321                 var last;
 322
 323                 // Look for common filter expressions
 324                 while ( t  && t != last ) {
 325                         last = t;
 326
 327                         var p = jQuery.parse, m;
 328
 329                         for ( var i = 0; p[i]; i++ ) {
 330                                 m = p[i].exec( t );
 331
 332                                 if ( m ) {
 333                                         // Remove what we just matched
 334                                         t = t.substring( m[0].length );
 335
 336                                         m[2] = m[2].replace(/\\/g, "");
 337                                         break;
 338                                 }
 339                         }
 340
 341                         if ( !m )
 342                                 break;
 343
 344                         // :not() is a special case that can be optimized by
 345                         // keeping it out of the expression list
 346                         if ( m[1] == ":" && m[2] == "not" )
 347                                 r = jQuery.filter(m[3], r, true).r;
 348
 349                         // We can get a big speed boost by filtering by class here
 350                         else if ( m[1] == "." )
 351                                 r = jQuery.classFilter(r, m[2], not);
 352
 353                         else if ( m[1] == "@" ) {
 354                                 var tmp = [], type = m[3];
 355
 356                                 for ( var i = 0, rl = r.length; i < rl; i++ ) {
 357                                         var a = r[i], z = a[ jQuery.props[m[2]] || m[2] ];
 358
 359                                         if ( z == null || /href|src|selected/.test(m[2]) )
 360                                                 z = jQuery.attr(a,m[2]) || '';
 361
 362                                         if ( (type == "" && !!z ||
 363                                                  type == "=" && z == m[5] ||
 364                                                  type == "!=" && z != m[5] ||
 365                                                  type == "^=" && z && !z.indexOf(m[5]) ||
 366                                                  type == "$=" && z.substr(z.length - m[5].length) == m[5] ||
 367                                                  (type == "*=" || type == "~=") && z.indexOf(m[5]) >= 0) ^ not )
 368                                                         tmp.push( a );
 369                                 }
 370
 371                                 r = tmp;
 372
 373                         // We can get a speed boost by handling nth-child here
 374                         } else if ( m[1] == ":" && m[2] == "nth-child" ) {
 375                                 var num = jQuery.mergeNum++, tmp = [],
 376                                         test = /(\d*)n\+?(\d*)/.exec(
 377                                                 m[3] == "even" && "2n" || m[3] == "odd" && "2n+1" ||
 378                                                 !/\D/.test(m[3]) && "n+" + m[3] || m[3]),
 379                                         first = (test[1] || 1) - 0, last = test[2] - 0;
 380
 381                                 for ( var i = 0, rl = r.length; i < rl; i++ ) {
 382                                         var node = r[i], parentNode = node.parentNode;
 383
 384                                         if ( num != parentNode.mergeNum ) {
 385                                                 var c = 1;
 386
 387                                                 for ( var n = parentNode.firstChild; n; n = n.nextSibling )
 388                                                         if ( n.nodeType == 1 )
 389                                                                 n.nodeIndex = c++;
 390
 391                                                 parentNode.mergeNum = num;
 392                                         }
 393
 394                                         var add = false;
 395
 396                                         if ( first == 1 ) {
 397                                                 if ( last == 0 || node.nodeIndex == last )
 398                                                         add = true;
 399                                         } else if ( (node.nodeIndex + last) % first == 0 )
 400                                                 add = true;
 401
 402                                         if ( add ^ not )
 403                                                 tmp.push( node );
 404                                 }
 405
 406                                 r = tmp;
 407
 408                         // Otherwise, find the expression to execute
 409                         } else {
 410                                 var f = jQuery.expr[m[1]];
 411                                 if ( typeof f != "string" )
 412                                         f = jQuery.expr[m[1]][m[2]];
 413
 414                                 // Build a custom macro to enclose it
 415                                 f = eval("false||function(a,i){return " + f + "}");
 416
 417                                 // Execute it against the current filter
 418                                 r = jQuery.grep( r, f, not );
 419                         }
 420                 }
 421
 422                 // Return an array of filtered elements (r)
 423                 // and the modified expression string (t)
 424                 return { r: r, t: t };
 425         },
 426
 427         /**
 428          * All ancestors of a given element.
 429          *
 430          * @private
 431          * @name $.parents
 432          * @type Array<Element>
 433          * @param Element elem The element to find the ancestors of.
 434          * @cat DOM/Traversing
 435          */
 436         parents: function( elem ){
 437                 var matched = [];
 438                 var cur = elem.parentNode;
 439                 while ( cur && cur != document ) {
 440                         matched.push( cur );
 441                         cur = cur.parentNode;
 442                 }
 443                 return matched;
 444         },
 445
 446         /**
 447          * A handy, and fast, way to traverse in a particular direction and find
 448          * a specific element.
 449          *
 450          * @private
 451          * @name $.nth
 452          * @type DOMElement
 453          * @param DOMElement cur The element to search from.
 454          * @param String|Number num The Nth result to match. Can be a number or a string (like 'even' or 'odd').
 455          * @param String dir The direction to move in (pass in something like 'previousSibling' or 'nextSibling').
 456          * @cat DOM/Traversing
 457          */
 458         nth: function(cur,result,dir,elem){
 459                 result = result || 1;
 460                 var num = 0;
 461
 462                 for ( ; cur; cur = cur[dir] )
 463                         if ( cur.nodeType == 1 && ++num == result )
 464                                 break;
 465
 466                 return cur;
 467         },
 468
 469         /**
 470          * All elements on a specified axis.
 471          *
 472          * @private
 473          * @name $.sibling
 474          * @type Array
 475          * @param Element elem The element to find all the siblings of (including itself).
 476          * @cat DOM/Traversing
 477          */
 478         sibling: function( n, elem ) {
 479                 var r = [];
 480
 481                 for ( ; n; n = n.nextSibling ) {
 482                         if ( n.nodeType == 1 && (!elem || n != elem) )
 483                                 r.push( n );
 484                 }
 485
 486                 return r;
 487         }
 488 });