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