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: '"hidden"!=a.type&&jQuery.css(a,"display")!="none"&&jQuery.css(a,"visibility")!="hidden"',
  31                         hidden: '"hidden"==a.type||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: "'text'==a.type",
  41                         radio: "'radio'==a.type",
  42                         checkbox: "'checkbox'==a.type",
  43                         file: "'file'==a.type",
  44                         password: "'password'==a.type",
  45                         submit: "'submit'==a.type",
  46                         image: "'image'==a.type",
  47                         reset: "'reset'==a.type",
  48                         button: '"button"==a.type||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: "var 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                 /^\[ *(@)([\w-]+) *([!*$^=]*) *('?"?)(.*?)\4 *\]/,
  71
  72                 // Match: [div], [div p]
  73                 /^(\[)\s*(.*?(\[.*?\])?[^[]*?)\s*\]/,
  74
  75                 // Match: :contains('foo')
  76                 /^(:)([\w-]+)\("?'?(.*?(\(.*?\))?[^(]*?)"?'?\)/,
  77
  78                 // Match: :even, :last-chlid, #id, .class
  79                 new RegExp("^([:.#]*)(" +
  80                         ( jQuery.chars = "(?:[\\w\u0128-\uFFFF*_-]|\\\\.)" ) + "+)")
  81         ],
  82
  83         token: [
  84                 /^(\/?\.\.)/, "a.parentNode",
  85                 /^(>|\/)/, "jQuery.sibling(a.firstChild)",
  86                 /^(\+)/, "jQuery.nth(a,2,'nextSibling')",
  87                 /^(~)/, function(a){
  88                         var s = jQuery.sibling(a.parentNode.firstChild);
  89                         return s.slice(jQuery.inArray(a,s) + 1);
  90                 }
  91         ],
  92
  93         multiFilter: function( expr, elems, not ) {
  94                 var old, cur = [];
  95
  96                 while ( expr && expr != old ) {
  97                         old = expr;
  98                         var f = jQuery.filter( expr, elems, not );
  99                         expr = f.t.replace(/^\s*,\s*/, "" );
 100                         cur = not ? elems = f.r : jQuery.merge( cur, f.r );
 101                 }
 102
 103                 return cur;
 104         },
 105
 106         /**
 107          * @name $.find
 108          * @type Array<Element>
 109          * @private
 110          * @cat Core
 111          */
 112         find: function( t, context ) {
 113                 // Quickly handle non-string expressions
 114                 if ( typeof t != "string" )
 115                         return [ t ];
 116
 117                 // Make sure that the context is a DOM Element
 118                 if ( context && !context.nodeType )
 119                         context = null;
 120
 121                 // Set the correct context (if none is provided)
 122                 context = context || document;
 123
 124                 // Handle the common XPath // expression
 125                 if ( !t.indexOf("//") ) {
 126                         context = context.documentElement;
 127                         t = t.substr(2,t.length);
 128
 129                 // And the / root expression
 130                 } else if ( !t.indexOf("/") && !context.ownerDocument ) {
 131                         context = context.documentElement;
 132                         t = t.substr(1,t.length);
 133                         if ( t.indexOf("/") >= 1 )
 134                                 t = t.substr(t.indexOf("/"),t.length);
 135                 }
 136
 137                 // Initialize the search
 138                 var ret = [context], done = [], last;
 139
 140                 // Continue while a selector expression exists, and while
 141                 // we're no longer looping upon ourselves
 142                 while ( t && last != t ) {
 143                         var r = [];
 144                         last = t;
 145
 146                         t = jQuery.trim(t).replace( /^\/\//, "" );
 147
 148                         var foundToken = false;
 149
 150                         // An attempt at speeding up child selectors that
 151                         // point to a specific element tag
 152                         var re = new RegExp("^[/>]\\s*(" + jQuery.chars + "+)");
 153                         var m = re.exec(t);
 154
 155                         if ( m ) {
 156                                 // Perform our own iteration and filter
 157                                 for ( var i = 0; ret[i]; i++ )
 158                                         for ( var c = ret[i].firstChild; c; c = c.nextSibling )
 159                                                 if ( c.nodeType == 1 && ( m[1] == "*" || jQuery.nodeName(c, m[1]) ) )
 160                                                         r.push( c );
 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, tl = jQuery.token.length; i < tl; i += 2 ) {
 169                                         // Attempt to match each, individual, token in
 170                                         // the specified order
 171                                         var re = jQuery.token[i], fn = jQuery.token[i+1];
 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( fn ) ?
 178                                                         fn : new Function( "a", "return " + fn ) );
 179
 180                                                 // And remove the token
 181                                                 t = jQuery.trim( t.replace( re, "" ) );
 182                                                 foundToken = true;
 183                                                 break;
 184                                         }
 185                                 }
 186                         }
 187
 188                         // See if there's still an expression, and that we haven't already
 189                         // matched a token
 190                         if ( t && !foundToken ) {
 191                                 // Handle multiple expressions
 192                                 if ( !t.indexOf(",") ) {
 193                                         // Clean the result set
 194                                         if ( context == ret[0] ) ret.shift();
 195
 196                                         // Merge the result sets
 197                                         done = jQuery.merge( done, ret );
 198
 199                                         // Reset the context
 200                                         r = ret = [context];
 201
 202                                         // Touch up the selector string
 203                                         t = " " + t.substr(1,t.length);
 204
 205                                 } else {
 206                                         // Optomize for the case nodeName#idName
 207                                         var re2 = new RegExp("^(" + jQuery.chars + "+)(#)(" + jQuery.chars + "+)");
 208                                         var m = re2.exec(t);
 209
 210                                         // Re-organize the results, so that they're consistent
 211                                         if ( m ) {
 212                                            m = [ 0, m[2], m[3], m[1] ];
 213
 214                                         } else {
 215                                                 // Otherwise, do a traditional filter check for
 216                                                 // ID, class, and element selectors
 217                                                 re2 = new RegExp("^([#.]?)(" + jQuery.chars + "*)");
 218                                                 m = re2.exec(t);
 219                                         }
 220
 221                                         m[2] = m[2].replace(/\\/g, "");
 222
 223                                         var elem = ret[ret.length-1];
 224
 225                                         // Try to do a global search by ID, where we can
 226                                         if ( m[1] == "#" && elem && elem.getElementById ) {
 227                                                 // Optimization for HTML document case
 228                                                 var oid = elem.getElementById(m[2]);
 229
 230                                                 // Do a quick check for the existence of the actual ID attribute
 231                                                 // to avoid selecting by the name attribute in IE
 232                                                 // also check to insure id is a string to avoid selecting an element with the name of 'id' inside a form
 233                                                 if ( (jQuery.browser.msie||jQuery.browser.opera) && oid && typeof oid.id == "string" && oid.id != m[2] )
 234                                                         oid = jQuery('[@id="'+m[2]+'"]', elem)[0];
 235
 236                                                 // Do a quick check for node name (where applicable) so
 237                                                 // that div#foo searches will be really fast
 238                                                 ret = r = oid && (!m[3] || jQuery.nodeName(oid, m[3])) ? [oid] : [];
 239                                         } else {
 240                                                 // We need to find all descendant elements
 241                                                 for ( var i = 0; ret[i]; i++ ) {
 242                                                         // Grab the tag name being searched for
 243                                                         var tag = m[1] != "" || m[0] == "" ? "*" : m[2];
 244
 245                                                         // Handle IE7 being really dumb about <object>s
 246                                                         if ( tag == "*" && ret[i].nodeName.toLowerCase() == "object" )
 247                                                                 tag = "param";
 248
 249                                                         r = jQuery.merge( r, ret[i].getElementsByTagName( tag ));
 250                                                 }
 251
 252                                                 // It's faster to filter by class and be done with it
 253                                                 if ( m[1] == "." )
 254                                                         r = jQuery.classFilter( r, m[2] );
 255
 256                                                 // Same with ID filtering
 257                                                 if ( m[1] == "#" ) {
 258                                                         var tmp = [];
 259
 260                                                         // Try to find the element with the ID
 261                                                         for ( var i = 0; r[i]; i++ )
 262                                                                 if ( r[i].getAttribute("id") == m[2] ) {
 263                                                                         tmp = [ r[i] ];
 264                                                                         break;
 265                                                                 }
 266
 267                                                         r = tmp;
 268                                                 }
 269
 270                                                 ret = r;
 271                                         }
 272
 273                                         t = t.replace( re2, "" );
 274                                 }
 275
 276                         }
 277
 278                         // If a selector string still exists
 279                         if ( t ) {
 280                                 // Attempt to filter it
 281                                 var val = jQuery.filter(t,r);
 282                                 ret = r = val.r;
 283                                 t = jQuery.trim(val.t);
 284                         }
 285                 }
 286
 287                 // An error occurred with the selector;
 288                 // just return an empty set instead
 289                 if ( t )
 290                         ret = [];
 291
 292                 // Remove the root context
 293                 if ( ret && context == ret[0] )
 294                         ret.shift();
 295
 296                 // And combine the results
 297                 done = jQuery.merge( done, ret );
 298
 299                 return done;
 300         },
 301
 302         classFilter: function(r,m,not){
 303                 m = " " + m + " ";
 304                 var tmp = [];
 305                 for ( var i = 0; r[i]; i++ ) {
 306                         var pass = (" " + r[i].className + " ").indexOf( m ) >= 0;
 307                         if ( !not && pass || not && !pass )
 308                                 tmp.push( r[i] );
 309                 }
 310                 return tmp;
 311         },
 312
 313         filter: function(t,r,not) {
 314                 var last;
 315
 316                 // Look for common filter expressions
 317                 while ( t  && t != last ) {
 318                         last = t;
 319
 320                         var p = jQuery.parse, m;
 321
 322                         for ( var i = 0; p[i]; i++ ) {
 323                                 m = p[i].exec( t );
 324
 325                                 if ( m ) {
 326                                         // Remove what we just matched
 327                                         t = t.substring( m[0].length );
 328
 329                                         // Re-organize the first match
 330                                         if ( jQuery.expr[ m[1] ]._resort )
 331                                                 m = jQuery.expr[ m[1] ]._resort( m );
 332
 333                                         m[2] = m[2].replace(/\\/g, "");
 334
 335                                         break;
 336                                 }
 337                         }
 338
 339                         if ( !m )
 340                                 break;
 341
 342                         // :not() is a special case that can be optimized by
 343                         // keeping it out of the expression list
 344                         if ( m[1] == ":" && m[2] == "not" )
 345                                 r = jQuery.filter(m[3], r, true).r;
 346
 347                         // We can get a big speed boost by filtering by class here
 348                         else if ( m[1] == "." )
 349                                 r = jQuery.classFilter(r, m[2], not);
 350
 351                         // Otherwise, find the expression to execute
 352                         else {
 353                                 var f = jQuery.expr[m[1]];
 354                                 if ( typeof f != "string" )
 355                                         f = jQuery.expr[m[1]][m[2]];
 356
 357                                 // Build a custom macro to enclose it
 358                                 eval("f = function(a,i){" +
 359                                         ( jQuery.expr[ m[1] ]._prefix || "" ) +
 360                                         "return " + f + "}");
 361
 362                                 // Execute it against the current filter
 363                                 r = jQuery.grep( r, f, not );
 364                         }
 365                 }
 366
 367                 // Return an array of filtered elements (r)
 368                 // and the modified expression string (t)
 369                 return { r: r, t: t };
 370         },
 371
 372         /**
 373          * All ancestors of a given element.
 374          *
 375          * @private
 376          * @name $.parents
 377          * @type Array<Element>
 378          * @param Element elem The element to find the ancestors of.
 379          * @cat DOM/Traversing
 380          */
 381         parents: function( elem ){
 382                 var matched = [];
 383                 var cur = elem.parentNode;
 384                 while ( cur && cur != document ) {
 385                         matched.push( cur );
 386                         cur = cur.parentNode;
 387                 }
 388                 return matched;
 389         },
 390
 391         /**
 392          * A handy, and fast, way to traverse in a particular direction and find
 393          * a specific element.
 394          *
 395          * @private
 396          * @name $.nth
 397          * @type DOMElement
 398          * @param DOMElement cur The element to search from.
 399          * @param String|Number num The Nth result to match. Can be a number or a string (like 'even' or 'odd').
 400          * @param String dir The direction to move in (pass in something like 'previousSibling' or 'nextSibling').
 401          * @cat DOM/Traversing
 402          */
 403         nth: function(cur,result,dir,elem){
 404                 result = result || 1;
 405                 var num = 0;
 406                 for ( ; cur; cur = cur[dir] ) {
 407                         if ( cur.nodeType == 1 ) num++;
 408                         if ( num == result || result == "even" && num % 2 == 0 && num > 1 && cur == elem ||
 409                                 result == "odd" && num % 2 == 1 && cur == elem ) break;
 410                 }
 411                 return cur;
 412         },
 413
 414         /**
 415          * All elements on a specified axis.
 416          *
 417          * @private
 418          * @name $.sibling
 419          * @type Array
 420          * @param Element elem The element to find all the siblings of (including itself).
 421          * @cat DOM/Traversing
 422          */
 423         sibling: function( n, elem ) {
 424                 var r = [];
 425
 426                 for ( ; n; n = n.nextSibling ) {
 427                         if ( n.nodeType == 1 && (!elem || n != elem) )
 428                                 r.push( n );
 429                 }
 430
 431                 return r;
 432         }
 433 });