"jquery Source" Select method

1 /**2 * The Select method is one of the core methods of the Sizzle selector package, which mainly accomplishes the following tasks:3 * 1, call the Tokenize method to complete the resolution of the selector4 * 2, for no initial set (that is, seed is not assigned) and is a single block selector (that is, there is no comma in the selector string),5 * Complete the following items:6 * 1) for the first selector is the ID type and the context is document, the direct fetch object overrides the incoming context object7 * 2) If the selector is a single selector and is an ID, class, tag type, the matching DOM element is directly fetched and returned8 * 3) Gets the last ID, class, Tag type selector matching DOM element assigned to the initial set (i.e. the seed variable)9 * 3, get "precompiled" code by calling the compile method and execute, get and return the matching DOM elementTen  *   One * @param selector has gone to turn the trailing blank selector string A * @param context executes the initial contexts (that is, the collection of DOM elements) that match. If the context is not assigned, the document is taken.  - * @param results has been matched to the final result of the part. If results is not assigned, an empty array is assigned.  - * @param seed Initial Collection the  */ -select = Sizzle.select =function(selector, context, results, seed) { -     varI, tokens, token, type, find, -Compiled =typeofselector = = = "function" &&Selector, +         //in the absence of seed, the Tokensize method is called for lexical parsing, and the results are placed in match -         //Seed -Seed collection (the Finder searches for a qualifying label) and puts it into this initial set of seed +Match =!seed && tokenize ((selector = Compiled.selector | |selector)); A  atResults = Results | | []; -  -     //Try to minimize operations if there are no seed and only one group -     //There is only one set of selectors, that is, no commas in the selector -     if(Match.length = = 1 ) { -  in         //Take a shortcut and set the context if the root selector are an ID -         //Create a new collection to assign to tokens to ensure that the original collection is not changed totokens = Match[0] = Match[0].slice (0 ); +         /*  - * If the selector starts with an ID type and the second is a relationship (that is, +~> or a space), the * Gets the ID belongs to the object as the context continues to complete subsequent matches *              *   $ * The conditions are judged as follows:Panax Notoginseng * tokens.length > 2: If tokens has more than two selectors - * (token = tokens[0]). Type = = = "id": the type of the first selector is the ID (that is, beginning with #), the * Support.getbyid: Support getElementById function + * Context.nodetype = = = 9:context object is document A * documentishtml: HTML code is currently being processed the * Expr.relative[tokens[1].type]: The second tokens element is a relationship (that is, a +~> or a space) + * If all of the above conditions are met, execute the statement body within the IF -         */   $         if(Tokens.length > 2 && (token = tokens[0]). Type = = = "ID" && $Support.getbyid && Context.nodetype = = = 9 && documentishtml && -expr.relative[tokens[1].type]) { -  the             //find an element with ID Matches[1] -Context = (expr.find["ID"] (Token.matches[0].replace (RuneScape, Funescape), context) | | []) [0];Wuyi             if( !context) { the                 returnresults; -  Wu             //precompiled Matchers'll still verify ancestry, so step up a level -}Else if(compiled) { AboutContext =Context.parentnode; $             } -  -             //Remove the first selector from the selector -selector =Selector.slice (Tokens.shift (). value.length); A         } +  the         //Fetch A seed set for right-to-left matching -         //Where: "Needscontext" = new RegExp ("^" + whitespace + "*[>+~]|:( Even|odd|eq|gt|lt|nth|first|last) (?: \ \ ("+ Whitespace +" * (?:-\ \d) \\d*) "+ whitespace +" *\\) |) (? =[^-]|$) "," I ") $         //That is, if there are no structural pseudo-classes, these need to be filtered in another way, after which the article is dissected in detail.  the         //so, starting with the last rule, find the Seed collection first. thei = matchexpr["Needscontext"].test (selector)? 0: tokens.length; the          while(i-- ) { thetoken =Tokens[i]; -  in             //Abort If we hit a combinator the             //terminates loop,> + ~ null if a relationship selector is encountered the             if(expr.relative[(type =Token.type)]) { About                  Break; the             } the             /* the let's see if there's a finder. Find, the Finder is the browser some native Dom interface, simple expression is the following object + Expr.find = { - ' ID ': Context.getelementbyid, the ' CLASS ': Context.getelementsbyclassname,Bayi ' NAME ': Context.getelementsbyname, the ' TAG ': Context.getelementsbytagname the                 } -             */ -             if(Find =expr.find[type])) { the                 //Search, expanding context for leading sibling combinators the                 //try to search through this finder to match the initial set of eligible seed the                 if(seed =Find ( theToken.matches[0].replace (RuneScape, funescape), -Rsibling.test (Tokens[0].type) && testContext (context.parentnode) | |Context the                 )) ) { the  the                     //If seed is empty or no tokens remain, we can return early94                     //Delete this label theTokens.splice (i, 1 ); theselector = Seed.length &&Toselector (tokens); the                     //if the current selector is empty, push seed into results and return the result98                     if( !selector) { About push.apply (results, seed); -                         returnresults;101                     }102                     //The eligible seed collection has been found, and there are other rules at the front, jumping out103                      Break;104                 } the             }106         }107     }108 109     //Compile and execute a filtering function if one is not provided the     //provide ' match ' to avoid retokenization if we modified the selector above111(Compiled | |compile (selector, match)) ( the seed,113 context, the!documentishtml, the results, theRsibling.test (selector) && testContext (context.parentnode) | |Context117     );118     returnresults;119};

"jquery Source" Select method