src/selector/selector.js

   1 jQuery.extend({
   2         expr: {
   3                 "": "m[2]=='*'||jQuery.nodeName(a,m[2])",
   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)==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"||jQuery.nodeName(a,"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]];if(!z||/href|src/.test(m[3]))z=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(jQuery.inArray(a,s) + 1);
  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                                 jQuery.each( ret, function(){
 157                                         for ( var c = this.firstChild; c; c = c.nextSibling )
 158                                                 if ( c.nodeType == 1 && ( jQuery.nodeName(c, m[1]) || m[1] == "*" ) )
 159                                                         r.push( c );
 160                                 });
 161
 162                                 ret = r;
 163                                 t = t.replace( re, "" );
 164                                 if ( t.indexOf(" ") == 0 ) continue;
 165                                 foundToken = true;
 166                         } else {
 167                                 // Look for pre-defined expression tokens
 168                                 for ( var i = 0; i < jQuery.token.length; i += 2 ) {
 169                                         // Attempt to match each, individual, token in
 170                                         // the specified order
 171                                         var re = jQuery.token[i];
 172                                         var m = re.exec(t);
 173
 174                                         // If the token match was found
 175                                         if ( m ) {
 176                                                 // Map it against the token's handler
 177                                                 r = ret = jQuery.map( ret, jQuery.isFunction( jQuery.token[i+1] ) ?
 178                                                         jQuery.token[i+1] :
 179                                                         function(a){ return eval(jQuery.token[i+1]); });
 180
 181                                                 // And remove the token
 182                                                 t = jQuery.trim( t.replace( re, "" ) );
 183                                                 foundToken = true;
 184                                                 break;
 185                                         }
 186                                 }
 187                         }
 188
 189                         // See if there's still an expression, and that we haven't already
 190                         // matched a token
 191                         if ( t && !foundToken ) {
 192                                 // Handle multiple expressions
 193                                 if ( !t.indexOf(",") ) {
 194                                         // Clean the result set
 195                                         if ( ret[0] == context ) ret.shift();
 196
 197                                         // Merge the result sets
 198                                         jQuery.merge( done, ret );
 199
 200                                         // Reset the context
 201                                         r = ret = [context];
 202
 203                                         // Touch up the selector string
 204                                         t = " " + t.substr(1,t.length);
 205
 206                                 } else {
 207                                         // Optomize for the case nodeName#idName
 208                                         var re2 = /^([a-z0-9_-]+)(#)([a-z0-9\\*_-]*)/i;
 209                                         var m = re2.exec(t);
 210
 211                                         // Re-organize the results, so that they're consistent
 212                                         if ( m ) {
 213                                            m = [ 0, m[2], m[3], m[1] ];
 214
 215                                         } else {
 216                                                 // Otherwise, do a traditional filter check for
 217                                                 // ID, class, and element selectors
 218                                                 re2 = /^([#.]?)([a-z0-9\\*_-]*)/i;
 219                                                 m = re2.exec(t);
 220                                         }
 221
 222                                         // Try to do a global search by ID, where we can
 223                                         if ( m[1] == "#" && ret[ret.length-1].getElementById ) {
 224                                                 // Optimization for HTML document case
 225                                                 var oid = ret[ret.length-1].getElementById(m[2]);
 226
 227                                                 // Do a quick check for the existence of the actual ID attribute
 228                                                 // to avoid selecting by the name attribute in IE
 229                                                 if ( jQuery.browser.msie && oid && oid.id != m[2] )
 230                                                         oid = jQuery('[@id="'+m[2]+'"]', ret[ret.length-1])[0];
 231
 232                                                 // Do a quick check for node name (where applicable) so
 233                                                 // that div#foo searches will be really fast
 234                                                 ret = r = oid && (!m[3] || jQuery.nodeName(oid, m[3])) ? [oid] : [];
 235
 236                                         } else {
 237                                                 // Pre-compile a regular expression to handle class searches
 238                                                 if ( m[1] == "." )
 239                                                         var rec = new RegExp("(^|\\s)" + m[2] + "(\\s|$)");
 240
 241                                                 // We need to find all descendant elements, it is more
 242                                                 // efficient to use getAll() when we are already further down
 243                                                 // the tree - we try to recognize that here
 244                                                 jQuery.each( ret, function(){
 245                                                         // Grab the tag name being searched for
 246                                                         var tag = m[1] != "" || m[0] == "" ? "*" : m[2];
 247
 248                                                         // Handle IE7 being really dumb about <object>s
 249                                                         if ( jQuery.nodeName(this, "object") && tag == "*" )
 250                                                                 tag = "param";
 251
 252                                                         jQuery.merge( r,
 253                                                                 m[1] != "" && ret.length != 1 ?
 254                                                                         jQuery.getAll( this, [], m[1], m[2], rec ) :
 255                                                                         this.getElementsByTagName( tag )
 256                                                         );
 257                                                 });
 258
 259                                                 // It's faster to filter by class and be done with it
 260                                                 if ( m[1] == "." && ret.length == 1 )
 261                                                         r = jQuery.grep( r, function(e) {
 262                                                                 return rec.test(e.className);
 263                                                         });
 264
 265                                                 // Same with ID filtering
 266                                                 if ( m[1] == "#" && ret.length == 1 ) {
 267                                                         // Remember, then wipe out, the result set
 268                                                         var tmp = r;
 269                                                         r = [];
 270
 271                                                         // Then try to find the element with the ID
 272                                                         jQuery.each( tmp, function(){
 273                                                                 if ( this.getAttribute("id") == m[2] ) {
 274                                                                         r = [ this ];
 275                                                                         return false;
 276                                                                 }
 277                                                         });
 278                                                 }
 279
 280                                                 ret = r;
 281                                         }
 282
 283                                         t = t.replace( re2, "" );
 284                                 }
 285
 286                         }
 287
 288                         // If a selector string still exists
 289                         if ( t ) {
 290                                 // Attempt to filter it
 291                                 var val = jQuery.filter(t,r);
 292                                 ret = r = val.r;
 293                                 t = jQuery.trim(val.t);
 294                         }
 295                 }
 296
 297                 // Remove the root context
 298                 if ( ret && ret[0] == context ) ret.shift();
 299
 300                 // And combine the results
 301                 jQuery.merge( done, ret );
 302
 303                 return done;
 304         },
 305
 306         filter: function(t,r,not) {
 307                 // Look for common filter expressions
 308                 while ( t && /^[a-z[({<*:.#]/i.test(t) ) {
 309
 310                         var p = jQuery.parse, m;
 311
 312                         jQuery.each( p, function(i,re){
 313
 314                                 // Look for, and replace, string-like sequences
 315                                 // and finally build a regexp out of it
 316                                 m = re.exec( t );
 317
 318                                 if ( m ) {
 319                                         // Remove what we just matched
 320                                         t = t.substring( m[0].length );
 321
 322                                         // Re-organize the first match
 323                                         if ( jQuery.expr[ m[1] ]._resort )
 324                                                 m = jQuery.expr[ m[1] ]._resort( m );
 325
 326                                         return false;
 327                                 }
 328                         });
 329
 330                         // :not() is a special case that can be optimized by
 331                         // keeping it out of the expression list
 332                         if ( m[1] == ":" && m[2] == "not" )
 333                                 r = jQuery.filter(m[3], r, true).r;
 334
 335                         // Handle classes as a special case (this will help to
 336                         // improve the speed, as the regexp will only be compiled once)
 337                         else if ( m[1] == "." ) {
 338
 339                                 var re = new RegExp("(^|\\s)" + m[2] + "(\\s|$)");
 340                                 r = jQuery.grep( r, function(e){
 341                                         return re.test(e.className || "");
 342                                 }, not);
 343
 344                         // Otherwise, find the expression to execute
 345                         } else {
 346                                 var f = jQuery.expr[m[1]];
 347                                 if ( typeof f != "string" )
 348                                         f = jQuery.expr[m[1]][m[2]];
 349
 350                                 // Build a custom macro to enclose it
 351                                 eval("f = function(a,i){" +
 352                                         ( jQuery.expr[ m[1] ]._prefix || "" ) +
 353                                         "return " + f + "}");
 354
 355                                 // Execute it against the current filter
 356                                 r = jQuery.grep( r, f, not );
 357                         }
 358                 }
 359
 360                 // Return an array of filtered elements (r)
 361                 // and the modified expression string (t)
 362                 return { r: r, t: t };
 363         },
 364
 365         getAll: function( o, r, token, name, re ) {
 366                 for ( var s = o.firstChild; s; s = s.nextSibling )
 367                         if ( s.nodeType == 1 ) {
 368                                 var add = true;
 369
 370                                 if ( token == "." )
 371                                         add = s.className && re.test(s.className);
 372                                 else if ( token == "#" )
 373                                         add = s.getAttribute("id") == name;
 374
 375                                 if ( add )
 376                                         r.push( s );
 377
 378                                 if ( token == "#" && r.length ) break;
 379
 380                                 if ( s.firstChild )
 381                                         jQuery.getAll( s, r, token, name, re );
 382                         }
 383
 384                 return r;
 385         },
 386
 387         /**
 388          * All ancestors of a given element.
 389          *
 390          * @private
 391          * @name $.parents
 392          * @type Array<Element>
 393          * @param Element elem The element to find the ancestors of.
 394          * @cat DOM/Traversing
 395          */
 396         parents: function( elem ){
 397                 var matched = [];
 398                 var cur = elem.parentNode;
 399                 while ( cur && cur != document ) {
 400                         matched.push( cur );
 401                         cur = cur.parentNode;
 402                 }
 403                 return matched;
 404         },
 405
 406         /**
 407          * A handy, and fast, way to traverse in a particular direction and find
 408          * a specific element.
 409          *
 410          * @private
 411          * @name $.nth
 412          * @type DOMElement
 413          * @param DOMElement cur The element to search from.
 414          * @param String|Number num The Nth result to match. Can be a number or a string (like 'even' or 'odd').
 415          * @param String dir The direction to move in (pass in something like 'previousSibling' or 'nextSibling').
 416          * @cat DOM/Traversing
 417          */
 418         nth: function(cur,result,dir,elem){
 419                 result = result || 1;
 420                 var num = 0;
 421                 for ( ; cur; cur = cur[dir] ) {
 422                         if ( cur.nodeType == 1 ) num++;
 423                         if ( num == result || result == "even" && num % 2 == 0 && num > 1 && cur == elem ||
 424                                 result == "odd" && num % 2 == 1 && cur == elem ) return cur;
 425                 }
 426         },
 427
 428         /**
 429          * All elements on a specified axis.
 430          *
 431          * @private
 432          * @name $.sibling
 433          * @type Array
 434          * @param Element elem The element to find all the siblings of (including itself).
 435          * @cat DOM/Traversing
 436          */
 437         sibling: function( n, elem ) {
 438                 var r = [];
 439
 440                 for ( ; n; n = n.nextSibling ) {
 441                         if ( n.nodeType == 1 && (!elem || n != elem) )
 442                                 r.push( n );
 443                 }
 444
 445                 return r;
 446         }
 447 });