Added test for #769
[jquery.git] / 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                 "[": "parseInt(m[2])?jQuery.nth(a.parentNode.firstChild,parseInt(m[2]),'nextSibling',a)==a: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                 /^\[ *(@)([\w-]+) *([!*$^=]*) *('?"?)(.*?)\4 *\]/i,
71
72                 // Match: [div], [div p]
73                 /^(\[)\s*(.*?(\[.*?\])?[^[]*?)\s*\]/,
74
75                 // Match: :contains('foo')
76                 /^(:)([\w-]+)\("?'?(.*?(\(.*?\))?[^(]*?)"?'?\)/i,
77
78                 // Match: :even, :last-chlid, #id, .class
79                 /^([:.#]*)((?:[\w\u0128-\uFFFF*-]|\\.)+)/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("/") && !context.ownerDocument ) {
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;
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( /^\/\//, "" );
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*([\w*-]+)/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                                         done = 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 = /^(\w+)(#)((?:[\w\u0128-\uFFFF*-]|\\.)+)/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 = /^([#.]?)((?:[\w\u0128-\uFFFF*-]|\\.)*)/i;
219                                                 m = re2.exec(t);
220                                         }
221
222                                         m[2] = m[2].replace(/\\/g, "");
223
224                                         var elem = ret[ret.length-1];
225
226                                         // Try to do a global search by ID, where we can
227                                         if ( m[1] == "#" && elem && elem.getElementById ) {
228                                                 // Optimization for HTML document case
229                                                 var oid = elem.getElementById(m[2]);
230                                                 
231                                                 // Do a quick check for the existence of the actual ID attribute
232                                                 // to avoid selecting by the name attribute in IE
233                                                 if ( jQuery.browser.msie && oid && 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
240                                         } else {
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                                                 for ( var i = 0, rl = ret.length; i < rl; i++ ) {
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 ( tag == "*" && ret[i].nodeName.toLowerCase() == "object" )
250                                                                 tag = "param";
251
252                                                         r = jQuery.merge( r, ret[i].getElementsByTagName( tag ));
253                                                 }
254
255                                                 // It's faster to filter by class and be done with it
256                                                 if ( m[1] == "." )
257                                                         r = jQuery.grep( r, function(e) {
258                                                                 return jQuery.className.has(e, m[2]);
259                                                         });
260
261                                                 // Same with ID filtering
262                                                 if ( m[1] == "#" ) {
263                                                         // Remember, then wipe out, the result set
264                                                         var tmp = r;
265                                                         r = [];
266
267                                                         // Then try to find the element with the ID
268                                                         jQuery.each( tmp, function(){
269                                                                 if ( this.getAttribute("id") == m[2] ) {
270                                                                         r = [ this ];
271                                                                         return false;
272                                                                 }
273                                                         });
274                                                 }
275
276                                                 ret = r;
277                                         }
278
279                                         t = t.replace( re2, "" );
280                                 }
281
282                         }
283
284                         // If a selector string still exists
285                         if ( t ) {
286                                 // Attempt to filter it
287                                 var val = jQuery.filter(t,r);
288                                 ret = r = val.r;
289                                 t = jQuery.trim(val.t);
290                         }
291                 }
292
293                 // An error occurred with the selector;
294                 // just return an empty set instead
295                 if ( t )
296                         ret = [];
297
298                 // Remove the root context
299                 if ( ret && ret[0] == context )
300                         ret.shift();
301
302                 // And combine the results
303                 done = jQuery.merge( done, ret );
304
305                 return done;
306         },
307
308         filter: function(t,r,not) {
309                 var last;
310
311                 // Look for common filter expressions
312                 while ( t  && t != last ) {
313                         last = t;
314
315                         var p = jQuery.parse, m;
316
317                         jQuery.each( p, function(i,re){
318                 
319                                 // Look for, and replace, string-like sequences
320                                 // and finally build a regexp out of it
321                                 m = re.exec( t );
322
323                                 if ( m ) {
324                                         // Remove what we just matched
325                                         t = t.substring( m[0].length );
326
327                                         // Re-organize the first match
328                                         if ( jQuery.expr[ m[1] ]._resort )
329                                                 m = jQuery.expr[ m[1] ]._resort( m );
330
331                                         m[2] = m[2].replace(/\\/g, "");
332
333                                         return false;
334                                 }
335                         });
336
337                         if ( !m )
338                                 continue;
339
340                         // :not() is a special case that can be optimized by
341                         // keeping it out of the expression list
342                         if ( m[1] == ":" && m[2] == "not" )
343                                 r = jQuery.filter(m[3], r, true).r;
344
345                         // Otherwise, find the expression to execute
346                         else {
347                                 var f = jQuery.expr[m[1]];
348                                 if ( typeof f != "string" )
349                                         f = jQuery.expr[m[1]][m[2]];
350
351                                 // Build a custom macro to enclose it
352                                 eval("f = function(a,i){" +
353                                         ( jQuery.expr[ m[1] ]._prefix || "" ) +
354                                         "return " + f + "}");
355
356                                 // Execute it against the current filter
357                                 r = jQuery.grep( r, f, not );
358                         }
359                 }
360
361                 // Return an array of filtered elements (r)
362                 // and the modified expression string (t)
363                 return { r: r, t: t };
364         },
365
366         /**
367          * All ancestors of a given element.
368          *
369          * @private
370          * @name $.parents
371          * @type Array<Element>
372          * @param Element elem The element to find the ancestors of.
373          * @cat DOM/Traversing
374          */
375         parents: function( elem ){
376                 var matched = [];
377                 var cur = elem.parentNode;
378                 while ( cur && cur != document ) {
379                         matched.push( cur );
380                         cur = cur.parentNode;
381                 }
382                 return matched;
383         },
384         
385         /**
386          * A handy, and fast, way to traverse in a particular direction and find
387          * a specific element.
388          *
389          * @private
390          * @name $.nth
391          * @type DOMElement
392          * @param DOMElement cur The element to search from.
393          * @param String|Number num The Nth result to match. Can be a number or a string (like 'even' or 'odd').
394          * @param String dir The direction to move in (pass in something like 'previousSibling' or 'nextSibling').
395          * @cat DOM/Traversing
396          */
397         nth: function(cur,result,dir,elem){
398                 result = result || 1;
399                 var num = 0;
400                 for ( ; cur; cur = cur[dir] ) {
401                         if ( cur.nodeType == 1 ) num++;
402                         if ( num == result || result == "even" && num % 2 == 0 && num > 1 && cur == elem ||
403                                 result == "odd" && num % 2 == 1 && cur == elem ) return cur;
404                 }
405         },
406         
407         /**
408          * All elements on a specified axis.
409          *
410          * @private
411          * @name $.sibling
412          * @type Array
413          * @param Element elem The element to find all the siblings of (including itself).
414          * @cat DOM/Traversing
415          */
416         sibling: function( n, elem ) {
417                 var r = [];
418
419                 for ( ; n; n = n.nextSibling ) {
420                         if ( n.nodeType == 1 && (!elem || n != elem) )
421                                 r.push( n );
422                 }
423
424                 return r;
425         }
426 });