src/selector-native.js

   1 /*
   2  * Optional limited selector module for custom builds.
   3  *
   4  * Note that this DOES NOT SUPPORT many documented jQuery
   5  * features in exchange for its smaller size:
   6  *
   7  * * Attribute not equal selector (!=)
   8  * * Positional selectors (:first; :eq(n); :odd; etc.)
   9  * * Type selectors (:input; :checkbox; :button; etc.)
  10  * * State-based selectors (:animated; :visible; :hidden; etc.)
  11  * * :has(selector) in browsers without native support
  12  * * :not(complex selector) in IE
  13  * * custom selectors via jQuery extensions
  14  * * Reliable functionality on XML fragments
  15  * * Matching against non-elements
  16  * * Reliable sorting of disconnected nodes
  17  * * querySelectorAll bug fixes (e.g., unreliable :focus on WebKit)
  18  *
  19  * If any of these are unacceptable tradeoffs, either use the full
  20  * selector engine or  customize this stub for the project's specific
  21  * needs.
  22  */
  23
  24 import jQuery from "./core.js";
  25 import document from "./var/document.js";
  26 import whitespace from "./var/whitespace.js";
  27
  28 // The following utils are attached directly to the jQuery object.
  29 import "./selector/escapeSelector.js";
  30 import "./selector/uniqueSort.js";
  31 import isIE from "./var/isIE.js";
  32 import booleans from "./selector/var/booleans.js";
  33 import rleadingCombinator from "./selector/var/rleadingCombinator.js";
  34 import rdescend from "./selector/var/rdescend.js";
  35 import rsibling from "./selector/var/rsibling.js";
  36 import matches from "./selector/var/matches.js";
  37 import testContext from "./selector/testContext.js";
  38 import filterMatchExpr from "./selector/filterMatchExpr.js";
  39 import preFilter from "./selector/preFilter.js";
  40 import tokenize from "./selector/tokenize.js";
  41 import toSelector from "./selector/toSelector.js";
  42
  43 var matchExpr = jQuery.extend( {
  44         bool: new RegExp( "^(?:" + booleans + ")$", "i" ),
  45         needsContext: new RegExp( "^" + whitespace + "*[>+~]" )
  46 }, filterMatchExpr );
  47
  48 jQuery.extend( {
  49         find: function( selector, context, results, seed ) {
  50                 var elem, nid, groups, newSelector,
  51                         newContext = context && context.ownerDocument,
  52
  53                         // nodeType defaults to 9, since context defaults to document
  54                         nodeType = context ? context.nodeType : 9,
  55                         i = 0;
  56
  57                 results = results || [];
  58                 context = context || document;
  59
  60                 // Same basic safeguard as in the full selector module
  61                 if ( !selector || typeof selector !== "string" ) {
  62                         return results;
  63                 }
  64
  65                 // Early return if context is not an element, document or document fragment
  66                 if ( nodeType !== 1 && nodeType !== 9 && nodeType !== 11 ) {
  67                         return [];
  68                 }
  69
  70                 if ( seed ) {
  71                         while ( ( elem = seed[ i++ ] ) ) {
  72                                 if ( jQuery.find.matchesSelector( elem, selector ) ) {
  73                                         results.push( elem );
  74                                 }
  75                         }
  76                 } else {
  77
  78                         newSelector = selector;
  79                         newContext = context;
  80
  81                         // qSA considers elements outside a scoping root when evaluating child or
  82                         // descendant combinators, which is not what we want.
  83                         // In such cases, we work around the behavior by prefixing every selector in the
  84                         // list with an ID selector referencing the scope context.
  85                         // The technique has to be used as well when a leading combinator is used
  86                         // as such selectors are not recognized by querySelectorAll.
  87                         // Thanks to Andrew Dupont for this technique.
  88                         if ( nodeType === 1 &&
  89                                 ( rdescend.test( selector ) || rleadingCombinator.test( selector ) ) ) {
  90
  91                                 // Expand context for sibling selectors
  92                                 newContext = rsibling.test( selector ) &&
  93                                         testContext( context.parentNode ) ||
  94                                         context;
  95
  96                                 // Outside of IE, if we're not changing the context we can
  97                                 // use :scope instead of an ID.
  98                                 if ( newContext !== context || isIE ) {
  99
 100                                         // Capture the context ID, setting it first if necessary
 101                                         if ( ( nid = context.getAttribute( "id" ) ) ) {
 102                                                 nid = jQuery.escapeSelector( nid );
 103                                         } else {
 104                                                 context.setAttribute( "id", ( nid = jQuery.expando ) );
 105                                         }
 106                                 }
 107
 108                                 // Prefix every selector in the list
 109                                 groups = tokenize( selector );
 110                                 i = groups.length;
 111                                 while ( i-- ) {
 112                                         groups[ i ] = ( nid ? "#" + nid : ":scope" ) + " " +
 113                                                 toSelector( groups[ i ] );
 114                                 }
 115                                 newSelector = groups.join( "," );
 116                         }
 117
 118                         try {
 119                                 jQuery.merge( results, newContext.querySelectorAll( newSelector ) );
 120                         } finally {
 121                                 if ( nid === jQuery.expando ) {
 122                                         context.removeAttribute( "id" );
 123                                 }
 124                         }
 125                 }
 126
 127                 return results;
 128         },
 129         expr: {
 130
 131                 // Can be adjusted by the user
 132                 cacheLength: 50,
 133
 134                 match: matchExpr,
 135                 preFilter: preFilter
 136         }
 137 } );
 138
 139 jQuery.extend( jQuery.find, {
 140         matches: function( expr, elements ) {
 141                 return jQuery.find( expr, null, null, elements );
 142         },
 143         matchesSelector: function( elem, expr ) {
 144                 return matches.call( elem, expr );
 145         }
 146 } );