src/selector.js

   1 \r
   2 var chars = jQuery.browser.safari && parseInt(jQuery.browser.version) < 417 ?\r
   3                 "(?:[\\w*_-]|\\\\.)" :\r
   4                 "(?:[\\w\u0128-\uFFFF*_-]|\\\\.)",\r
   5         quickChild = new RegExp("^>\\s*(" + chars + "+)"),\r
   6         quickID = new RegExp("^(" + chars + "+)(#)(" + chars + "+)"),\r
   7         quickClass = new RegExp("^([#.]?)(" + chars + "*)");\r
   8 \r
   9 jQuery.extend({\r
  10         expr: {\r
  11                 "": function(a,i,m){return m[2]=="*"||jQuery.nodeName(a,m[2]);},\r
  12                 "#": function(a,i,m){return a.getAttribute("id")==m[2];},\r
  13                 ":": {\r
  14                         // Position Checks\r
  15                         lt: function(a,i,m){return i<m[3]-0;},\r
  16                         gt: function(a,i,m){return i>m[3]-0;},\r
  17                         nth: function(a,i,m){return m[3]-0==i;},\r
  18                         eq: function(a,i,m){return m[3]-0==i;},\r
  19                         first: function(a,i){return i==0;},\r
  20                         last: function(a,i,m,r){return i==r.length-1;},\r
  21                         even: function(a,i){return i%2==0;},\r
  22                         odd: function(a,i){return i%2;},\r
  23 \r
  24                         // Child Checks\r
  25                         "first-child": function(a){return a.parentNode.getElementsByTagName("*")[0]==a;},\r
  26                         "last-child": function(a){return jQuery.nth(a.parentNode.lastChild,1,"previousSibling")==a;},\r
  27                         "only-child": function(a){return !jQuery.nth(a.parentNode.lastChild,2,"previousSibling");},\r
  28 \r
  29                         // Parent Checks\r
  30                         parent: function(a){return a.firstChild;},\r
  31                         empty: function(a){return !a.firstChild;},\r
  32 \r
  33                         // Text Check\r
  34                         contains: function(a,i,m){return (a.textContent||a.innerText||jQuery(a).text()||"").indexOf(m[3])>=0;},\r
  35 \r
  36                         // Visibility\r
  37                         visible: function(a){return "hidden"!=a.type&&jQuery.css(a,"display")!="none"&&jQuery.css(a,"visibility")!="hidden";},\r
  38                         hidden: function(a){return "hidden"==a.type||jQuery.css(a,"display")=="none"||jQuery.css(a,"visibility")=="hidden";},\r
  39 \r
  40                         // Form attributes\r
  41                         enabled: function(a){return !a.disabled;},\r
  42                         disabled: function(a){return a.disabled;},\r
  43                         checked: function(a){return a.checked;},\r
  44                         selected: function(a){return a.selected||jQuery.attr(a,"selected");},\r
  45 \r
  46                         // Form elements\r
  47                         text: function(a){return "text"==a.type;},\r
  48                         radio: function(a){return "radio"==a.type;},\r
  49                         checkbox: function(a){return "checkbox"==a.type;},\r
  50                         file: function(a){return "file"==a.type;},\r
  51                         password: function(a){return "password"==a.type;},\r
  52                         submit: function(a){return "submit"==a.type;},\r
  53                         image: function(a){return "image"==a.type;},\r
  54                         reset: function(a){return "reset"==a.type;},\r
  55                         button: function(a){return "button"==a.type||jQuery.nodeName(a,"button");},\r
  56                         input: function(a){return /input|select|textarea|button/i.test(a.nodeName);},\r
  57 \r
  58                         // :has()\r
  59                         has: function(a,i,m){return jQuery.find(m[3],a).length;},\r
  60 \r
  61                         // :header\r
  62                         header: function(a){return /h\d/i.test(a.nodeName);},\r
  63 \r
  64                         // :animated\r
  65                         animated: function(a){return jQuery.grep(jQuery.timers,function(fn){return a==fn.elem;}).length;}\r
  66                 }\r
  67         },\r
  68         \r
  69         // The regular expressions that power the parsing engine\r
  70         parse: [\r
  71                 // Match: [@value='test'], [@foo]\r
  72                 /^(\[) *@?([\w-]+) *([!*$^~=]*) *('?"?)(.*?)\4 *\]/,\r
  73 \r
  74                 // Match: :contains('foo')\r
  75                 /^(:)([\w-]+)\("?'?(.*?(\(.*?\))?[^(]*?)"?'?\)/,\r
  76 \r
  77                 // Match: :even, :last-chlid, #id, .class\r
  78                 new RegExp("^([:.#]*)(" + chars + "+)")\r
  79         ],\r
  80 \r
  81         multiFilter: function( expr, elems, not ) {\r
  82                 var old, cur = [];\r
  83 \r
  84                 while ( expr && expr != old ) {\r
  85                         old = expr;\r
  86                         var f = jQuery.filter( expr, elems, not );\r
  87                         expr = f.t.replace(/^\s*,\s*/, "" );\r
  88                         cur = not ? elems = f.r : jQuery.merge( cur, f.r );\r
  89                 }\r
  90 \r
  91                 return cur;\r
  92         },\r
  93 \r
  94         find: function( t, context ) {\r
  95                 // Quickly handle non-string expressions\r
  96                 if ( typeof t != "string" )\r
  97                         return [ t ];\r
  98 \r
  99                 // check to make sure context is a DOM element or a document\r
 100                 if ( context && context.nodeType != 1 && context.nodeType != 9)\r
 101                         return [ ];\r
 102 \r
 103                 // Set the correct context (if none is provided)\r
 104                 context = context || document;\r
 105 \r
 106                 // Initialize the search\r
 107                 var ret = [context], done = [], last, nodeName;\r
 108 \r
 109                 // Continue while a selector expression exists, and while\r
 110                 // we're no longer looping upon ourselves\r
 111                 while ( t && last != t ) {\r
 112                         var r = [];\r
 113                         last = t;\r
 114 \r
 115                         t = jQuery.trim(t);\r
 116 \r
 117                         var foundToken = false;\r
 118 \r
 119                         // An attempt at speeding up child selectors that\r
 120                         // point to a specific element tag\r
 121                         var re = quickChild;\r
 122                         var m = re.exec(t);\r
 123 \r
 124                         if ( m ) {\r
 125                                 nodeName = m[1].toUpperCase();\r
 126 \r
 127                                 // Perform our own iteration and filter\r
 128                                 for ( var i = 0; ret[i]; i++ )\r
 129                                         for ( var c = ret[i].firstChild; c; c = c.nextSibling )\r
 130                                                 if ( c.nodeType == 1 && (nodeName == "*" || c.nodeName.toUpperCase() == nodeName) )\r
 131                                                         r.push( c );\r
 132 \r
 133                                 ret = r;\r
 134                                 t = t.replace( re, "" );\r
 135                                 if ( t.indexOf(" ") == 0 ) continue;\r
 136                                 foundToken = true;\r
 137                         } else {\r
 138                                 re = /^([>+~])\s*(\w*)/i;\r
 139 \r
 140                                 if ( (m = re.exec(t)) != null ) {\r
 141                                         r = [];\r
 142 \r
 143                                         var merge = {};\r
 144                                         nodeName = m[2].toUpperCase();\r
 145                                         m = m[1];\r
 146 \r
 147                                         for ( var j = 0, rl = ret.length; j < rl; j++ ) {\r
 148                                                 var n = m == "~" || m == "+" ? ret[j].nextSibling : ret[j].firstChild;\r
 149                                                 for ( ; n; n = n.nextSibling )\r
 150                                                         if ( n.nodeType == 1 ) {\r
 151                                                                 var id = jQuery.data(n);\r
 152 \r
 153                                                                 if ( m == "~" && merge[id] ) break;\r
 154                                                                 \r
 155                                                                 if (!nodeName || n.nodeName.toUpperCase() == nodeName ) {\r
 156                                                                         if ( m == "~" ) merge[id] = true;\r
 157                                                                         r.push( n );\r
 158                                                                 }\r
 159                                                                 \r
 160                                                                 if ( m == "+" ) break;\r
 161                                                         }\r
 162                                         }\r
 163 \r
 164                                         ret = r;\r
 165 \r
 166                                         // And remove the token\r
 167                                         t = jQuery.trim( t.replace( re, "" ) );\r
 168                                         foundToken = true;\r
 169                                 }\r
 170                         }\r
 171 \r
 172                         // See if there's still an expression, and that we haven't already\r
 173                         // matched a token\r
 174                         if ( t && !foundToken ) {\r
 175                                 // Handle multiple expressions\r
 176                                 if ( !t.indexOf(",") ) {\r
 177                                         // Clean the result set\r
 178                                         if ( context == ret[0] ) ret.shift();\r
 179 \r
 180                                         // Merge the result sets\r
 181                                         done = jQuery.merge( done, ret );\r
 182 \r
 183                                         // Reset the context\r
 184                                         r = ret = [context];\r
 185 \r
 186                                         // Touch up the selector string\r
 187                                         t = " " + t.substr(1,t.length);\r
 188 \r
 189                                 } else {\r
 190                                         // Optimize for the case nodeName#idName\r
 191                                         var re2 = quickID;\r
 192                                         var m = re2.exec(t);\r
 193                                         \r
 194                                         // Re-organize the results, so that they're consistent\r
 195                                         if ( m ) {\r
 196                                                 m = [ 0, m[2], m[3], m[1] ];\r
 197 \r
 198                                         } else {\r
 199                                                 // Otherwise, do a traditional filter check for\r
 200                                                 // ID, class, and element selectors\r
 201                                                 re2 = quickClass;\r
 202                                                 m = re2.exec(t);\r
 203                                         }\r
 204 \r
 205                                         m[2] = m[2].replace(/\\/g, "");\r
 206 \r
 207                                         var elem = ret[ret.length-1];\r
 208 \r
 209                                         // Try to do a global search by ID, where we can\r
 210                                         if ( m[1] == "#" && elem && elem.getElementById && !jQuery.isXMLDoc(elem) ) {\r
 211                                                 // Optimization for HTML document case\r
 212                                                 var oid = elem.getElementById(m[2]);\r
 213                                                 \r
 214                                                 // Do a quick check for the existence of the actual ID attribute\r
 215                                                 // to avoid selecting by the name attribute in IE\r
 216                                                 // also check to insure id is a string to avoid selecting an element with the name of 'id' inside a form\r
 217                                                 if ( (jQuery.browser.msie||jQuery.browser.opera) && oid && typeof oid.id == "string" && oid.id != m[2] )\r
 218                                                         oid = jQuery('[@id="'+m[2]+'"]', elem)[0];\r
 219 \r
 220                                                 // Do a quick check for node name (where applicable) so\r
 221                                                 // that div#foo searches will be really fast\r
 222                                                 ret = r = oid && (!m[3] || jQuery.nodeName(oid, m[3])) ? [oid] : [];\r
 223                                         } else {\r
 224                                                 // We need to find all descendant elements\r
 225                                                 for ( var i = 0; ret[i]; i++ ) {\r
 226                                                         // Grab the tag name being searched for\r
 227                                                         var tag = m[1] == "#" && m[3] ? m[3] : m[1] != "" || m[0] == "" ? "*" : m[2];\r
 228 \r
 229                                                         // Handle IE7 being really dumb about <object>s\r
 230                                                         if ( tag == "*" && ret[i].nodeName.toLowerCase() == "object" )\r
 231                                                                 tag = "param";\r
 232 \r
 233                                                         r = jQuery.merge( r, ret[i].getElementsByTagName( tag ));\r
 234                                                 }\r
 235 \r
 236                                                 // It's faster to filter by class and be done with it\r
 237                                                 if ( m[1] == "." )\r
 238                                                         r = jQuery.classFilter( r, m[2] );\r
 239 \r
 240                                                 // Same with ID filtering\r
 241                                                 if ( m[1] == "#" ) {\r
 242                                                         var tmp = [];\r
 243 \r
 244                                                         // Try to find the element with the ID\r
 245                                                         for ( var i = 0; r[i]; i++ )\r
 246                                                                 if ( r[i].getAttribute("id") == m[2] ) {\r
 247                                                                         tmp = [ r[i] ];\r
 248                                                                         break;\r
 249                                                                 }\r
 250 \r
 251                                                         r = tmp;\r
 252                                                 }\r
 253 \r
 254                                                 ret = r;\r
 255                                         }\r
 256 \r
 257                                         t = t.replace( re2, "" );\r
 258                                 }\r
 259 \r
 260                         }\r
 261 \r
 262                         // If a selector string still exists\r
 263                         if ( t ) {\r
 264                                 // Attempt to filter it\r
 265                                 var val = jQuery.filter(t,r);\r
 266                                 ret = r = val.r;\r
 267                                 t = jQuery.trim(val.t);\r
 268                         }\r
 269                 }\r
 270 \r
 271                 // An error occurred with the selector;\r
 272                 // just return an empty set instead\r
 273                 if ( t )\r
 274                         ret = [];\r
 275 \r
 276                 // Remove the root context\r
 277                 if ( ret && context == ret[0] )\r
 278                         ret.shift();\r
 279 \r
 280                 // And combine the results\r
 281                 done = jQuery.merge( done, ret );\r
 282 \r
 283                 return done;\r
 284         },\r
 285 \r
 286         classFilter: function(r,m,not){\r
 287                 m = " " + m + " ";\r
 288                 var tmp = [];\r
 289                 for ( var i = 0; r[i]; i++ ) {\r
 290                         var pass = (" " + r[i].className + " ").indexOf( m ) >= 0;\r
 291                         if ( !not && pass || not && !pass )\r
 292                                 tmp.push( r[i] );\r
 293                 }\r
 294                 return tmp;\r
 295         },\r
 296 \r
 297         filter: function(t,r,not) {\r
 298                 var last;\r
 299 \r
 300                 // Look for common filter expressions\r
 301                 while ( t && t != last ) {\r
 302                         last = t;\r
 303 \r
 304                         var p = jQuery.parse, m;\r
 305 \r
 306                         for ( var i = 0; p[i]; i++ ) {\r
 307                                 m = p[i].exec( t );\r
 308 \r
 309                                 if ( m ) {\r
 310                                         // Remove what we just matched\r
 311                                         t = t.substring( m[0].length );\r
 312 \r
 313                                         m[2] = m[2].replace(/\\/g, "");\r
 314                                         break;\r
 315                                 }\r
 316                         }\r
 317 \r
 318                         if ( !m )\r
 319                                 break;\r
 320 \r
 321                         // :not() is a special case that can be optimized by\r
 322                         // keeping it out of the expression list\r
 323                         if ( m[1] == ":" && m[2] == "not" )\r
 324                                 // optimize if only one selector found (most common case)\r
 325                                 r = isSimple.test( m[3] ) ?\r
 326                                         jQuery.filter(m[3], r, true).r :\r
 327                                         jQuery( r ).not( m[3] );\r
 328 \r
 329                         // We can get a big speed boost by filtering by class here\r
 330                         else if ( m[1] == "." )\r
 331                                 r = jQuery.classFilter(r, m[2], not);\r
 332 \r
 333                         else if ( m[1] == "[" ) {\r
 334                                 var type = m[3];\r
 335                                 \r
 336                                 // special case, filter by exact name\r
 337                                 if ( !not && m[2] == 'name' && type == '=' )\r
 338                                         r = jQuery.grep( document.getElementsByName(m[5]), function(elem){\r
 339                                                 return jQuery.inArray( elem, r ) != -1; \r
 340                                         });\r
 341                                 else {\r
 342                                         for ( var i = 0, rl = r.length, tmp = []; i < rl; i++ ) {\r
 343                                                 var a = r[i], z = a[ jQuery.props[m[2]] || m[2] ];\r
 344                                                 \r
 345                                                 if ( z == null || /href|src|selected/.test(m[2]) )\r
 346                                                         z = jQuery.attr(a,m[2]) || '';\r
 347         \r
 348                                                 if ( (type == "" && !!z ||\r
 349                                                          type == "=" && z == m[5] ||\r
 350                                                          type == "!=" && z != m[5] ||\r
 351                                                          type == "^=" && z && !z.indexOf(m[5]) ||\r
 352                                                          type == "$=" && z.substr(z.length - m[5].length) == m[5] ||\r
 353                                                          (type == "*=" || type == "~=") && z.indexOf(m[5]) >= 0) ^ not )\r
 354                                                                 tmp.push( a );\r
 355                                         }                                       \r
 356                                         r = tmp;\r
 357                                 }\r
 358 \r
 359                         // We can get a speed boost by handling nth-child here\r
 360                         } else if ( m[1] == ":" && m[2] == "nth-child" ) {\r
 361                                 var merge = {}, tmp = [],\r
 362                                         // parse equations like 'even', 'odd', '5', '2n', '3n+2', '4n-1', '-n+6'\r
 363                                         test = /(-?)(\d*)n((?:\+|-)?\d*)/.exec(\r
 364                                                 m[3] == "even" && "2n" || m[3] == "odd" && "2n+1" ||\r
 365                                                 !/\D/.test(m[3]) && "0n+" + m[3] || m[3]),\r
 366                                         // calculate the numbers (first)n+(last) including if they are negative\r
 367                                         first = (test[1] + (test[2] || 1)) - 0, last = test[3] - 0;\r
 368  \r
 369                                 // loop through all the elements left in the jQuery object\r
 370                                 for ( var i = 0, rl = r.length; i < rl; i++ ) {\r
 371                                         var node = r[i], parentNode = node.parentNode, id = jQuery.data(parentNode);\r
 372 \r
 373                                         if ( !merge[id] ) {\r
 374                                                 var c = 1;\r
 375 \r
 376                                                 for ( var n = parentNode.firstChild; n; n = n.nextSibling )\r
 377                                                         if ( n.nodeType == 1 )\r
 378                                                                 n.nodeIndex = c++;\r
 379 \r
 380                                                 merge[id] = true;\r
 381                                         }\r
 382 \r
 383                                         var add = false;\r
 384 \r
 385                                         if ( first == 0 ) {\r
 386                                                 if ( node.nodeIndex == last )\r
 387                                                         add = true;\r
 388                                         } else if ( (node.nodeIndex - last) % first == 0 && (node.nodeIndex - last) / first >= 0 )\r
 389                                                 add = true;\r
 390 \r
 391                                         if ( add ^ not )\r
 392                                                 tmp.push( node );\r
 393                                 }\r
 394 \r
 395                                 r = tmp;\r
 396 \r
 397                         // Otherwise, find the expression to execute\r
 398                         } else {\r
 399                                 var fn = jQuery.expr[ m[1] ];\r
 400                                 if ( typeof fn == "object" )\r
 401                                         fn = fn[ m[2] ];\r
 402 \r
 403                                 if ( typeof fn == "string" )\r
 404                                         fn = eval("false||function(a,i){return " + fn + ";}");\r
 405 \r
 406                                 // Execute it against the current filter\r
 407                                 r = jQuery.grep( r, function(elem, i){\r
 408                                         return fn(elem, i, m, r);\r
 409                                 }, not );\r
 410                         }\r
 411                 }\r
 412 \r
 413                 // Return an array of filtered elements (r)\r
 414                 // and the modified expression string (t)\r
 415                 return { r: r, t: t };\r
 416         },\r
 417 \r
 418         dir: function( elem, dir ){\r
 419                 var matched = [];\r
 420                 var cur = elem[dir];\r
 421                 while ( cur && cur != document ) {\r
 422                         if ( cur.nodeType == 1 )\r
 423                                 matched.push( cur );\r
 424                         cur = cur[dir];\r
 425                 }\r
 426                 return matched;\r
 427         },\r
 428         \r
 429         nth: function(cur,result,dir,elem){\r
 430                 result = result || 1;\r
 431                 var num = 0;\r
 432 \r
 433                 for ( ; cur; cur = cur[dir] )\r
 434                         if ( cur.nodeType == 1 && ++num == result )\r
 435                                 break;\r
 436 \r
 437                 return cur;\r
 438         },\r
 439         \r
 440         sibling: function( n, elem ) {\r
 441                 var r = [];\r
 442 \r
 443                 for ( ; n; n = n.nextSibling ) {\r
 444                         if ( n.nodeType == 1 && (!elem || n != elem) )\r
 445                                 r.push( n );\r
 446                 }\r
 447 \r
 448                 return r;\r
 449         }\r
 450 });\r
 451 \r