src/selector/selector.js

   1 jQuery.extend({
   2         expr: {
   3                 "": "m[2]=='*'||a.nodeName.toUpperCase()==m[2].toUpperCase()",
   4                 "#": "a.getAttribute('id')==m[2]",
   5                 ":": {
   6                         // Position Checks
   7                         lt: "i<m[3]-0",
   8                         gt: "i>m[3]-0",
   9                         nth: "m[3]-0==i",
  10                         eq: "m[3]-0==i",
  11                         first: "i==0",
  12                         last: "i==r.length-1",
  13                         even: "i%2==0",
  14                         odd: "i%2",
  15
  16                         // Child Checks
  17                         "nth-child": "jQuery.nth(a.parentNode.firstChild,m[3],'nextSibling')==a",
  18                         "first-child": "jQuery.nth(a.parentNode.firstChild,1,'nextSibling')==a",
  19                         "last-child": "jQuery.nth(a.parentNode.lastChild,1,'previousSibling')==a",
  20                         "only-child": "jQuery.sibling(a.parentNode.firstChild).length==1",
  21
  22                         // Parent Checks
  23                         parent: "a.firstChild",
  24                         empty: "!a.firstChild",
  25
  26                         // Text Check
  27                         contains: "jQuery.fn.text.apply([a]).indexOf(m[3])>=0",
  28
  29                         // Visibility
  30                         visible: 'a.type!="hidden"&&jQuery.css(a,"display")!="none"&&jQuery.css(a,"visibility")!="hidden"',
  31                         hidden: 'a.type=="hidden"||jQuery.css(a,"display")=="none"||jQuery.css(a,"visibility")=="hidden"',
  32
  33                         // Form attributes
  34                         enabled: "!a.disabled",
  35                         disabled: "a.disabled",
  36                         checked: "a.checked",
  37                         selected: "a.selected||jQuery.attr(a,'selected')",
  38
  39                         // Form elements
  40                         text: "a.type=='text'",
  41                         radio: "a.type=='radio'",
  42                         checkbox: "a.type=='checkbox'",
  43                         file: "a.type=='file'",
  44                         password: "a.type=='password'",
  45                         submit: "a.type=='submit'",
  46                         image: "a.type=='image'",
  47                         reset: "a.type=='reset'",
  48                         button: 'a.type=="button"||a.nodeName=="BUTTON"',
  49                         input: "/input|select|textarea|button/i.test(a.nodeName)"
  50                 },
  51                 ".": "jQuery.className.has(a,m[2])",
  52                 "@": {
  53                         "=": "z==m[4]",
  54                         "!=": "z!=m[4]",
  55                         "^=": "z&&!z.indexOf(m[4])",
  56                         "$=": "z&&z.substr(z.length - m[4].length,m[4].length)==m[4]",
  57                         "*=": "z&&z.indexOf(m[4])>=0",
  58                         "": "z",
  59                         _resort: function(m){
  60                                 return ["", m[1], m[3], m[2], m[5]];
  61                         },
  62                         _prefix: "z=a[m[3]]||jQuery.attr(a,m[3]);"
  63                 },
  64                 "[": "jQuery.find(m[2],a).length"
  65         },
  66
  67         // The regular expressions that power the parsing engine
  68         parse: [
  69                 // Match: [@value='test'], [@foo]
  70                 /^\[ *(@)([a-z0-9_-]*) *([!*$^=]*) *('?"?)(.*?)\4 *\]/i,
  71
  72                 // Match: [div], [div p]
  73                 /^(\[)\s*(.*?(\[.*?\])?[^[]*?)\s*\]/,
  74
  75                 // Match: :contains('foo')
  76                 /^(:)([a-z0-9_-]*)\("?'?(.*?(\(.*?\))?[^(]*?)"?'?\)/i,
  77
  78                 // Match: :even, :last-chlid
  79                 /^([:.#]*)([a-z0-9_-]*)/i
  80         ],
  81
  82         token: [
  83                 /^(\/?\.\.)/, "a.parentNode",
  84                 /^(>|\/)/, "jQuery.sibling(a.firstChild)",
  85                 /^(\+)/, "jQuery.nth(a,2,'nextSibling')",
  86                 /^(~)/, function(a){
  87                         var s = jQuery.sibling(a.parentNode.firstChild);
  88                         return s.slice(0, jQuery.inArray(a,s));
  89                 }
  90         ],
  91
  92         multiFilter: function( expr, elems, not ) {
  93                 var old, cur = [];
  94
  95                 while ( expr && expr != old ) {
  96                         old = expr;
  97                         var f = jQuery.filter( expr, elems, not );
  98                         expr = f.t.replace(/^\s*,\s*/, "" );
  99                         cur = not ? elems = f.r : jQuery.merge( cur, f.r );
 100                 }
 101
 102                 return cur;
 103         },
 104
 105         /**
 106          * @name $.find
 107          * @type Array<Element>
 108          * @private
 109          * @cat Core
 110          */
 111         find: function( t, context ) {
 112                 // Quickly handle non-string expressions
 113                 if ( typeof t != "string" )
 114                         return [ t ];
 115
 116                 // Make sure that the context is a DOM Element
 117                 if ( context && !context.nodeType )
 118                         context = null;
 119
 120                 // Set the correct context (if none is provided)
 121                 context = context || document;
 122
 123                 // Handle the common XPath // expression
 124                 if ( !t.indexOf("//") ) {
 125                         context = context.documentElement;
 126                         t = t.substr(2,t.length);
 127
 128                 // And the / root expression
 129                 } else if ( !t.indexOf("/") ) {
 130                         context = context.documentElement;
 131                         t = t.substr(1,t.length);
 132                         if ( t.indexOf("/") >= 1 )
 133                                 t = t.substr(t.indexOf("/"),t.length);
 134                 }
 135
 136                 // Initialize the search
 137                 var ret = [context], done = [], last = null;
 138
 139                 // Continue while a selector expression exists, and while
 140                 // we're no longer looping upon ourselves
 141                 while ( t && last != t ) {
 142                         var r = [];
 143                         last = t;
 144
 145                         t = jQuery.trim(t).replace( /^\/\//i, "" );
 146
 147                         var foundToken = false;
 148
 149                         // An attempt at speeding up child selectors that
 150                         // point to a specific element tag
 151                         var re = /^[\/>]\s*([a-z0-9*-]+)/i;
 152                         var m = re.exec(t);
 153
 154                         if ( m ) {
 155                                 // Perform our own iteration and filter
 156                                 for ( var i = 0, rl = ret.length; i < rl; i++ )
 157                                         for ( var c = ret[i].firstChild; c; c = c.nextSibling )
 158                                                 if ( c.nodeType == 1 && ( c.nodeName == m[1].toUpperCase() || m[1] == "*" ) )
 159                                                         r.push( c );
 160
 161                                 ret = r;
 162                                 t = jQuery.trim( t.replace( re, "" ) );
 163                                 foundToken = true;
 164                         } else {
 165                                 // Look for pre-defined expression tokens
 166                                 for ( var i = 0; i < jQuery.token.length; i += 2 ) {
 167                                         // Attempt to match each, individual, token in
 168                                         // the specified order
 169                                         var re = jQuery.token[i];
 170                                         var m = re.exec(t);
 171
 172                                         // If the token match was found
 173                                         if ( m ) {
 174                                                 // Map it against the token's handler
 175                                                 r = ret = jQuery.map( ret, jQuery.isFunction( jQuery.token[i+1] ) ?
 176                                                         jQuery.token[i+1] :
 177                                                         function(a){ return eval(jQuery.token[i+1]); });
 178
 179                                                 // And remove the token
 180                                                 t = jQuery.trim( t.replace( re, "" ) );
 181                                                 foundToken = true;
 182                                                 break;
 183                                         }
 184                                 }
 185                         }
 186
 187                         // See if there's still an expression, and that we haven't already
 188                         // matched a token
 189                         if ( t && !foundToken ) {
 190                                 // Handle multiple expressions
 191                                 if ( !t.indexOf(",") ) {
 192                                         // Clean the result set
 193                                         if ( ret[0] == context ) ret.shift();
 194
 195                                         // Merge the result sets
 196                                         jQuery.merge( done, ret );
 197
 198                                         // Reset the context
 199                                         r = ret = [context];
 200
 201                                         // Touch up the selector string
 202                                         t = " " + t.substr(1,t.length);
 203
 204                                 } else {
 205                                         // Optomize for the case nodeName#idName
 206                                         var re2 = /^([a-z0-9_-]+)(#)([a-z0-9\\*_-]*)/i;
 207                                         var m = re2.exec(t);
 208
 209                                         // Re-organize the results, so that they're consistent
 210                                         if ( m ) {
 211                                            m = [ 0, m[2], m[3], m[1] ];
 212
 213                                         } else {
 214                                                 // Otherwise, do a traditional filter check for
 215                                                 // ID, class, and element selectors
 216                                                 re2 = /^([#.]?)([a-z0-9\\*_-]*)/i;
 217                                                 m = re2.exec(t);
 218                                         }
 219
 220                                         // Try to do a global search by ID, where we can
 221                                         if ( m[1] == "#" && ret[ret.length-1].getElementById ) {
 222                                                 // Optimization for HTML document case
 223                                                 var oid = ret[ret.length-1].getElementById(m[2]);
 224
 225                                                 // Do a quick check for node name (where applicable) so
 226                                                 // that div#foo searches will be really fast
 227                                                 ret = r = oid &&
 228                                                   (!m[3] || oid.nodeName == m[3].toUpperCase()) ? [oid] : [];
 229
 230                                         } else {
 231                                                 // Pre-compile a regular expression to handle class searches
 232                                                 if ( m[1] == "." )
 233                                                         var rec = new RegExp("(^|\\s)" + m[2] + "(\\s|$)");
 234
 235                                                 // We need to find all descendant elements, it is more
 236                                                 // efficient to use getAll() when we are already further down
 237                                                 // the tree - we try to recognize that here
 238                                                 for ( var i = 0, rl = ret.length; i < rl; i++ ) {
 239                                                         // Grab the tag name being searched for
 240                                                         var tag = m[1] != "" || m[0] == "" ? "*" : m[2];
 241
 242                                                         // Handle IE7 being really dumb about <object>s
 243                                                         if ( ret[i].nodeName.toUpperCase() == "OBJECT" && tag == "*" )
 244                                                                 tag = "param";
 245
 246                                                         jQuery.merge( r,
 247                                                                 m[1] != "" && ret.length != 1 ?
 248                                                                         jQuery.getAll( ret[i], [], m[1], m[2], rec ) :
 249                                                                         ret[i].getElementsByTagName( tag )
 250                                                         );
 251                                                 }
 252
 253                                                 // It's faster to filter by class and be done with it
 254                                                 if ( m[1] == "." && ret.length == 1 )
 255                                                         r = jQuery.grep( r, function(e) {
 256                                                                 return rec.test(e.className);
 257                                                         });
 258
 259                                                 // Same with ID filtering
 260                                                 if ( m[1] == "#" && ret.length == 1 ) {
 261                                                         // Remember, then wipe out, the result set
 262                                                         var tmp = r;
 263                                                         r = [];
 264
 265                                                         // Then try to find the element with the ID
 266                                                         for ( var i = 0, tl = tmp.length; i < tl; i++ )
 267                                                                 if ( tmp[i].getAttribute("id") == m[2] ) {
 268                                                                         r = [ tmp[i] ];
 269                                                                         break;
 270                                                                 }
 271                                                 }
 272
 273                                                 ret = r;
 274                                         }
 275
 276                                         t = t.replace( re2, "" );
 277                                 }
 278
 279                         }
 280
 281                         // If a selector string still exists
 282                         if ( t ) {
 283                                 // Attempt to filter it
 284                                 var val = jQuery.filter(t,r);
 285                                 ret = r = val.r;
 286                                 t = jQuery.trim(val.t);
 287                         }
 288                 }
 289
 290                 // Remove the root context
 291                 if ( ret && ret[0] == context ) ret.shift();
 292
 293                 // And combine the results
 294                 jQuery.merge( done, ret );
 295
 296                 return done;
 297         },
 298
 299         filter: function(t,r,not) {
 300                 // Look for common filter expressions
 301                 while ( t && /^[a-z[({<*:.#]/i.test(t) ) {
 302
 303                         var p = jQuery.parse;
 304
 305                         for ( var i = 0, pl = p.length; i < pl; i++ ) {
 306
 307                                 // Look for, and replace, string-like sequences
 308                                 // and finally build a regexp out of it
 309                                 var re = p[i];
 310                                 var m = re.exec( t );
 311
 312                                 if ( m ) {
 313                                         // Remove what we just matched
 314                                         t = t.substring( m[0].length );
 315
 316                                         // Re-organize the first match
 317                                         if ( jQuery.expr[ m[1] ]._resort )
 318                                                 m = jQuery.expr[ m[1] ]._resort( m );
 319
 320                                         break;
 321                                 }
 322                         }
 323
 324                         // :not() is a special case that can be optimized by
 325                         // keeping it out of the expression list
 326                         if ( m[1] == ":" && m[2] == "not" )
 327                                 r = jQuery.filter(m[3], r, true).r;
 328
 329                         // Handle classes as a special case (this will help to
 330                         // improve the speed, as the regexp will only be compiled once)
 331                         else if ( m[1] == "." ) {
 332
 333                                 var re = new RegExp("(^|\\s)" + m[2] + "(\\s|$)");
 334                                 r = jQuery.grep( r, function(e){
 335                                         return re.test(e.className || "");
 336                                 }, not);
 337
 338                         // Otherwise, find the expression to execute
 339                         } else {
 340                                 var f = jQuery.expr[m[1]];
 341                                 if ( typeof f != "string" )
 342                                         f = jQuery.expr[m[1]][m[2]];
 343
 344                                 // Build a custom macro to enclose it
 345                                 eval("f = function(a,i){" +
 346                                         ( jQuery.expr[ m[1] ]._prefix || "" ) +
 347                                         "return " + f + "}");
 348
 349                                 // Execute it against the current filter
 350                                 r = jQuery.grep( r, f, not );
 351                         }
 352                 }
 353
 354                 // Return an array of filtered elements (r)
 355                 // and the modified expression string (t)
 356                 return { r: r, t: t };
 357         },
 358
 359         getAll: function( o, r, token, name, re ) {
 360                 for ( var s = o.firstChild; s; s = s.nextSibling )
 361                         if ( s.nodeType == 1 ) {
 362                                 var add = true;
 363
 364                                 if ( token == "." )
 365                                         add = s.className && re.test(s.className);
 366                                 else if ( token == "#" )
 367                                         add = s.getAttribute("id") == name;
 368
 369                                 if ( add )
 370                                         r.push( s );
 371
 372                                 if ( token == "#" && r.length ) break;
 373
 374                                 if ( s.firstChild )
 375                                         jQuery.getAll( s, r, token, name, re );
 376                         }
 377
 378                 return r;
 379         },
 380
 381         /**
 382          * All ancestors of a given element.
 383          *
 384          * @private
 385          * @name $.parents
 386          * @type Array<Element>
 387          * @param Element elem The element to find the ancestors of.
 388          * @cat DOM/Traversing
 389          */
 390         parents: function( elem ){
 391                 var matched = [];
 392                 var cur = elem.parentNode;
 393                 while ( cur && cur != document ) {
 394                         matched.push( cur );
 395                         cur = cur.parentNode;
 396                 }
 397                 return matched;
 398         },
 399
 400         /**
 401          * A handy, and fast, way to traverse in a particular direction and find
 402          * a specific element.
 403          *
 404          * @private
 405          * @name $.nth
 406          * @type DOMElement
 407          * @param DOMElement cur The element to search from.
 408          * @param Number|String num The Nth result to match. Can be a number or a string (like 'even' or 'odd').
 409          * @param String dir The direction to move in (pass in something like 'previousSibling' or 'nextSibling').
 410          * @cat DOM/Traversing
 411          */
 412         nth: function(cur,result,dir){
 413                 result = result || 1;
 414                 var num = 0;
 415                 for ( ; cur; cur = cur[dir] ) {
 416                         if ( cur.nodeType == 1 ) num++;
 417                         if ( num == result || result == "even" && num % 2 == 0 && num > 1 ||
 418                                 result == "odd" && num % 2 == 1 ) return cur;
 419                 }
 420         },
 421
 422         /**
 423          * All elements on a specified axis.
 424          *
 425          * @private
 426          * @name $.sibling
 427          * @type Array
 428          * @param Element elem The element to find all the siblings of (including itself).
 429          * @cat DOM/Traversing
 430          */
 431         sibling: function( n, elem ) {
 432                 var r = [];
 433
 434                 for ( ; n; n = n.nextSibling ) {
 435                         if ( n.nodeType == 1 && (!elem || n != elem) )
 436                                 r.push( n );
 437                 }
 438
 439                 return r;
 440         }
 441 });