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// Initialize a jQuery object
import jQuery from "../core.js";
import document from "../var/document.js";
import rsingleTag from "./var/rsingleTag.js";
import isObviousHtml from "./isObviousHtml.js";
import "../traversing/findFilter.js";
// A central reference to the root jQuery(document)
var rootjQuery,
// A simple way to check for HTML strings
// Prioritize #id over <tag> to avoid XSS via location.hash (trac-9521)
// Strict HTML recognition (trac-11290: must start with <)
// Shortcut simple #id case for speed
rquickExpr = /^(?:\s*(<[\w\W]+>)[^>]*|#([\w-]+))$/,
init = jQuery.fn.init = function( selector, context ) {
var match, elem;
// HANDLE: $(""), $(null), $(undefined), $(false)
if ( !selector ) {
return this;
}
// HANDLE: $(DOMElement)
if ( selector.nodeType ) {
this[ 0 ] = selector;
this.length = 1;
return this;
// HANDLE: $(function)
// Shortcut for document ready
} else if ( typeof selector === "function" ) {
return rootjQuery.ready !== undefined ?
rootjQuery.ready( selector ) :
// Execute immediately if ready is not present
selector( jQuery );
} else {
// Handle obvious HTML strings
match = selector + "";
if ( isObviousHtml( match ) ) {
// Assume that strings that start and end with <> are HTML and skip
// the regex check. This also handles browser-supported HTML wrappers
// like TrustedHTML.
match = [ null, selector, null ];
// Handle HTML strings or selectors
} else if ( typeof selector === "string" ) {
match = rquickExpr.exec( selector );
} else {
return jQuery.makeArray( selector, this );
}
// Match html or make sure no context is specified for #id
// Note: match[1] may be a string or a TrustedHTML wrapper
if ( match && ( match[ 1 ] || !context ) ) {
// HANDLE: $(html) -> $(array)
if ( match[ 1 ] ) {
context = context instanceof jQuery ? context[ 0 ] : context;
// Option to run scripts is true for back-compat
// Intentionally let the error be thrown if parseHTML is not present
jQuery.merge( this, jQuery.parseHTML(
match[ 1 ],
context && context.nodeType ? context.ownerDocument || context : document,
true
) );
// HANDLE: $(html, props)
if ( rsingleTag.test( match[ 1 ] ) && jQuery.isPlainObject( context ) ) {
for ( match in context ) {
// Properties of context are called as methods if possible
if ( typeof this[ match ] === "function" ) {
this[ match ]( context[ match ] );
// ...and otherwise set as attributes
} else {
this.attr( match, context[ match ] );
}
}
}
return this;
// HANDLE: $(#id)
} else {
elem = document.getElementById( match[ 2 ] );
if ( elem ) {
// Inject the element directly into the jQuery object
this[ 0 ] = elem;
this.length = 1;
}
return this;
}
// HANDLE: $(expr) & $(expr, $(...))
} else if ( !context || context.jquery ) {
return ( context || rootjQuery ).find( selector );
// HANDLE: $(expr, context)
// (which is just equivalent to: $(context).find(expr)
} else {
return this.constructor( context ).find( selector );
}
}
};
// Give the init function the jQuery prototype for later instantiation
init.prototype = jQuery.fn;
// Initialize central reference
rootjQuery = jQuery( document );
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