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