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1 // Initialize a jQuery object
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2 define( [
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3 "../core",
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4 "../var/document",
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5 "../var/isFunction",
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6 "./var/rsingleTag",
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7
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8 "../traversing/findFilter"
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9 ], function( jQuery, document, isFunction, rsingleTag ) {
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10
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11 "use strict";
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12
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13 // A central reference to the root jQuery(document)
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14 var rootjQuery,
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15
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16 // A simple way to check for HTML strings
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17 // Prioritize #id over <tag> to avoid XSS via location.hash (#9521)
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18 // Strict HTML recognition (#11290: must start with <)
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19 // Shortcut simple #id case for speed
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20 rquickExpr = /^(?:\s*(<[\w\W]+>)[^>]*|#([\w-]+))$/,
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21
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22 init = jQuery.fn.init = function( selector, context, root ) {
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23 var match, elem;
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24
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25 // HANDLE: $(""), $(null), $(undefined), $(false)
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26 if ( !selector ) {
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27 return this;
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28 }
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29
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30 // Method init() accepts an alternate rootjQuery
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31 // so migrate can support jQuery.sub (gh-2101)
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32 root = root || rootjQuery;
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33
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34 // Handle HTML strings
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35 if ( typeof selector === "string" ) {
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36 if ( selector[ 0 ] === "<" &&
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37 selector[ selector.length - 1 ] === ">" &&
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38 selector.length >= 3 ) {
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39
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40 // Assume that strings that start and end with <> are HTML and skip the regex check
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41 match = [ null, selector, null ];
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42
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43 } else {
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44 match = rquickExpr.exec( selector );
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45 }
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46
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47 // Match html or make sure no context is specified for #id
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48 if ( match && ( match[ 1 ] || !context ) ) {
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49
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50 // HANDLE: $(html) -> $(array)
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51 if ( match[ 1 ] ) {
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52 context = context instanceof jQuery ? context[ 0 ] : context;
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53
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54 // Option to run scripts is true for back-compat
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55 // Intentionally let the error be thrown if parseHTML is not present
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56 jQuery.merge( this, jQuery.parseHTML(
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57 match[ 1 ],
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58 context && context.nodeType ? context.ownerDocument || context : document,
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59 true
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60 ) );
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61
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62 // HANDLE: $(html, props)
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63 if ( rsingleTag.test( match[ 1 ] ) && jQuery.isPlainObject( context ) ) {
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64 for ( match in context ) {
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65
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66 // Properties of context are called as methods if possible
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67 if ( isFunction( this[ match ] ) ) {
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68 this[ match ]( context[ match ] );
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69
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70 // ...and otherwise set as attributes
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71 } else {
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72 this.attr( match, context[ match ] );
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73 }
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74 }
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75 }
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76
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77 return this;
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78
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79 // HANDLE: $(#id)
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80 } else {
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81 elem = document.getElementById( match[ 2 ] );
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82
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83 if ( elem ) {
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84
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85 // Inject the element directly into the jQuery object
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86 this[ 0 ] = elem;
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87 this.length = 1;
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88 }
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89 return this;
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90 }
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91
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92 // HANDLE: $(expr, $(...))
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93 } else if ( !context || context.jquery ) {
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94 return ( context || root ).find( selector );
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95
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96 // HANDLE: $(expr, context)
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97 // (which is just equivalent to: $(context).find(expr)
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98 } else {
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99 return this.constructor( context ).find( selector );
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100 }
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101
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102 // HANDLE: $(DOMElement)
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103 } else if ( selector.nodeType ) {
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104 this[ 0 ] = selector;
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105 this.length = 1;
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106 return this;
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107
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108 // HANDLE: $(function)
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109 // Shortcut for document ready
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110 } else if ( isFunction( selector ) ) {
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111 return root.ready !== undefined ?
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112 root.ready( selector ) :
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113
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114 // Execute immediately if ready is not present
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115 selector( jQuery );
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116 }
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117
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118 return jQuery.makeArray( selector, this );
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119 };
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120
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121 // Give the init function the jQuery prototype for later instantiation
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122 init.prototype = jQuery.fn;
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123
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124 // Initialize central reference
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125 rootjQuery = jQuery( document );
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126
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127 return init;
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128
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129 } );
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