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