src/core.js

   1 import arr from "./var/arr.js";
   2 import getProto from "./var/getProto.js";
   3 import slice from "./var/slice.js";
   4 import flat from "./var/flat.js";
   5 import push from "./var/push.js";
   6 import indexOf from "./var/indexOf.js";
   7 import class2type from "./var/class2type.js";
   8 import toString from "./var/toString.js";
   9 import hasOwn from "./var/hasOwn.js";
  10 import fnToString from "./var/fnToString.js";
  11 import ObjectFunctionString from "./var/ObjectFunctionString.js";
  12 import support from "./var/support.js";
  13 import isArrayLike from "./core/isArrayLike.js";
  14 import DOMEval from "./core/DOMEval.js";
  15
  16 var version = "@VERSION",
  17
  18         rhtmlSuffix = /HTML$/i,
  19
  20         // Define a local copy of jQuery
  21         jQuery = function( selector, context ) {
  22
  23                 // The jQuery object is actually just the init constructor 'enhanced'
  24                 // Need init if jQuery is called (just allow error to be thrown if not included)
  25                 return new jQuery.fn.init( selector, context );
  26         };
  27
  28 jQuery.fn = jQuery.prototype = {
  29
  30         // The current version of jQuery being used
  31         jquery: version,
  32
  33         constructor: jQuery,
  34
  35         // The default length of a jQuery object is 0
  36         length: 0,
  37
  38         toArray: function() {
  39                 return slice.call( this );
  40         },
  41
  42         // Get the Nth element in the matched element set OR
  43         // Get the whole matched element set as a clean array
  44         get: function( num ) {
  45
  46                 // Return all the elements in a clean array
  47                 if ( num == null ) {
  48                         return slice.call( this );
  49                 }
  50
  51                 // Return just the one element from the set
  52                 return num < 0 ? this[ num + this.length ] : this[ num ];
  53         },
  54
  55         // Take an array of elements and push it onto the stack
  56         // (returning the new matched element set)
  57         pushStack: function( elems ) {
  58
  59                 // Build a new jQuery matched element set
  60                 var ret = jQuery.merge( this.constructor(), elems );
  61
  62                 // Add the old object onto the stack (as a reference)
  63                 ret.prevObject = this;
  64
  65                 // Return the newly-formed element set
  66                 return ret;
  67         },
  68
  69         // Execute a callback for every element in the matched set.
  70         each: function( callback ) {
  71                 return jQuery.each( this, callback );
  72         },
  73
  74         map: function( callback ) {
  75                 return this.pushStack( jQuery.map( this, function( elem, i ) {
  76                         return callback.call( elem, i, elem );
  77                 } ) );
  78         },
  79
  80         slice: function() {
  81                 return this.pushStack( slice.apply( this, arguments ) );
  82         },
  83
  84         first: function() {
  85                 return this.eq( 0 );
  86         },
  87
  88         last: function() {
  89                 return this.eq( -1 );
  90         },
  91
  92         even: function() {
  93                 return this.pushStack( jQuery.grep( this, function( _elem, i ) {
  94                         return ( i + 1 ) % 2;
  95                 } ) );
  96         },
  97
  98         odd: function() {
  99                 return this.pushStack( jQuery.grep( this, function( _elem, i ) {
 100                         return i % 2;
 101                 } ) );
 102         },
 103
 104         eq: function( i ) {
 105                 var len = this.length,
 106                         j = +i + ( i < 0 ? len : 0 );
 107                 return this.pushStack( j >= 0 && j < len ? [ this[ j ] ] : [] );
 108         },
 109
 110         end: function() {
 111                 return this.prevObject || this.constructor();
 112         }
 113 };
 114
 115 jQuery.extend = jQuery.fn.extend = function() {
 116         var options, name, src, copy, copyIsArray, clone,
 117                 target = arguments[ 0 ] || {},
 118                 i = 1,
 119                 length = arguments.length,
 120                 deep = false;
 121
 122         // Handle a deep copy situation
 123         if ( typeof target === "boolean" ) {
 124                 deep = target;
 125
 126                 // Skip the boolean and the target
 127                 target = arguments[ i ] || {};
 128                 i++;
 129         }
 130
 131         // Handle case when target is a string or something (possible in deep copy)
 132         if ( typeof target !== "object" && typeof target !== "function" ) {
 133                 target = {};
 134         }
 135
 136         // Extend jQuery itself if only one argument is passed
 137         if ( i === length ) {
 138                 target = this;
 139                 i--;
 140         }
 141
 142         for ( ; i < length; i++ ) {
 143
 144                 // Only deal with non-null/undefined values
 145                 if ( ( options = arguments[ i ] ) != null ) {
 146
 147                         // Extend the base object
 148                         for ( name in options ) {
 149                                 copy = options[ name ];
 150
 151                                 // Prevent Object.prototype pollution
 152                                 // Prevent never-ending loop
 153                                 if ( name === "__proto__" || target === copy ) {
 154                                         continue;
 155                                 }
 156
 157                                 // Recurse if we're merging plain objects or arrays
 158                                 if ( deep && copy && ( jQuery.isPlainObject( copy ) ||
 159                                         ( copyIsArray = Array.isArray( copy ) ) ) ) {
 160                                         src = target[ name ];
 161
 162                                         // Ensure proper type for the source value
 163                                         if ( copyIsArray && !Array.isArray( src ) ) {
 164                                                 clone = [];
 165                                         } else if ( !copyIsArray && !jQuery.isPlainObject( src ) ) {
 166                                                 clone = {};
 167                                         } else {
 168                                                 clone = src;
 169                                         }
 170                                         copyIsArray = false;
 171
 172                                         // Never move original objects, clone them
 173                                         target[ name ] = jQuery.extend( deep, clone, copy );
 174
 175                                 // Don't bring in undefined values
 176                                 } else if ( copy !== undefined ) {
 177                                         target[ name ] = copy;
 178                                 }
 179                         }
 180                 }
 181         }
 182
 183         // Return the modified object
 184         return target;
 185 };
 186
 187 jQuery.extend( {
 188
 189         // Unique for each copy of jQuery on the page
 190         expando: "jQuery" + ( version + Math.random() ).replace( /\D/g, "" ),
 191
 192         // Assume jQuery is ready without the ready module
 193         isReady: true,
 194
 195         error: function( msg ) {
 196                 throw new Error( msg );
 197         },
 198
 199         noop: function() {},
 200
 201         isPlainObject: function( obj ) {
 202                 var proto, Ctor;
 203
 204                 // Detect obvious negatives
 205                 // Use toString instead of jQuery.type to catch host objects
 206                 if ( !obj || toString.call( obj ) !== "[object Object]" ) {
 207                         return false;
 208                 }
 209
 210                 proto = getProto( obj );
 211
 212                 // Objects with no prototype (e.g., `Object.create( null )`) are plain
 213                 if ( !proto ) {
 214                         return true;
 215                 }
 216
 217                 // Objects with prototype are plain iff they were constructed by a global Object function
 218                 Ctor = hasOwn.call( proto, "constructor" ) && proto.constructor;
 219                 return typeof Ctor === "function" && fnToString.call( Ctor ) === ObjectFunctionString;
 220         },
 221
 222         isEmptyObject: function( obj ) {
 223                 var name;
 224
 225                 for ( name in obj ) {
 226                         return false;
 227                 }
 228                 return true;
 229         },
 230
 231         // Evaluates a script in a provided context; falls back to the global one
 232         // if not specified.
 233         globalEval: function( code, options, doc ) {
 234                 DOMEval( code, { nonce: options && options.nonce }, doc );
 235         },
 236
 237         each: function( obj, callback ) {
 238                 var length, i = 0;
 239
 240                 if ( isArrayLike( obj ) ) {
 241                         length = obj.length;
 242                         for ( ; i < length; i++ ) {
 243                                 if ( callback.call( obj[ i ], i, obj[ i ] ) === false ) {
 244                                         break;
 245                                 }
 246                         }
 247                 } else {
 248                         for ( i in obj ) {
 249                                 if ( callback.call( obj[ i ], i, obj[ i ] ) === false ) {
 250                                         break;
 251                                 }
 252                         }
 253                 }
 254
 255                 return obj;
 256         },
 257
 258
 259         // Retrieve the text value of an array of DOM nodes
 260         text: function( elem ) {
 261                 var node,
 262                         ret = "",
 263                         i = 0,
 264                         nodeType = elem.nodeType;
 265
 266                 if ( !nodeType ) {
 267
 268                         // If no nodeType, this is expected to be an array
 269                         while ( ( node = elem[ i++ ] ) ) {
 270
 271                                 // Do not traverse comment nodes
 272                                 ret += jQuery.text( node );
 273                         }
 274                 }
 275                 if ( nodeType === 1 || nodeType === 11 ) {
 276                         return elem.textContent;
 277                 }
 278                 if ( nodeType === 9 ) {
 279                         return elem.documentElement.textContent;
 280                 }
 281                 if ( nodeType === 3 || nodeType === 4 ) {
 282                         return elem.nodeValue;
 283                 }
 284
 285                 // Do not include comment or processing instruction nodes
 286
 287                 return ret;
 288         },
 289
 290
 291         // results is for internal usage only
 292         makeArray: function( arr, results ) {
 293                 var ret = results || [];
 294
 295                 if ( arr != null ) {
 296                         if ( isArrayLike( Object( arr ) ) ) {
 297                                 jQuery.merge( ret,
 298                                         typeof arr === "string" ?
 299                                                 [ arr ] : arr
 300                                 );
 301                         } else {
 302                                 push.call( ret, arr );
 303                         }
 304                 }
 305
 306                 return ret;
 307         },
 308
 309         inArray: function( elem, arr, i ) {
 310                 return arr == null ? -1 : indexOf.call( arr, elem, i );
 311         },
 312
 313         isXMLDoc: function( elem ) {
 314                 var namespace = elem && elem.namespaceURI,
 315                         docElem = elem && ( elem.ownerDocument || elem ).documentElement;
 316
 317                 // Assume HTML when documentElement doesn't yet exist, such as inside
 318                 // document fragments.
 319                 return !rhtmlSuffix.test( namespace || docElem && docElem.nodeName || "HTML" );
 320         },
 321
 322         // Note: an element does not contain itself
 323         contains: function( a, b ) {
 324                 var bup = b && b.parentNode;
 325
 326                 return a === bup || !!( bup && bup.nodeType === 1 && (
 327
 328                         // Support: IE 9 - 11+
 329                         // IE doesn't have `contains` on SVG.
 330                         a.contains ?
 331                                 a.contains( bup ) :
 332                                 a.compareDocumentPosition && a.compareDocumentPosition( bup ) & 16
 333                 ) );
 334         },
 335
 336         merge: function( first, second ) {
 337                 var len = +second.length,
 338                         j = 0,
 339                         i = first.length;
 340
 341                 for ( ; j < len; j++ ) {
 342                         first[ i++ ] = second[ j ];
 343                 }
 344
 345                 first.length = i;
 346
 347                 return first;
 348         },
 349
 350         grep: function( elems, callback, invert ) {
 351                 var callbackInverse,
 352                         matches = [],
 353                         i = 0,
 354                         length = elems.length,
 355                         callbackExpect = !invert;
 356
 357                 // Go through the array, only saving the items
 358                 // that pass the validator function
 359                 for ( ; i < length; i++ ) {
 360                         callbackInverse = !callback( elems[ i ], i );
 361                         if ( callbackInverse !== callbackExpect ) {
 362                                 matches.push( elems[ i ] );
 363                         }
 364                 }
 365
 366                 return matches;
 367         },
 368
 369         // arg is for internal usage only
 370         map: function( elems, callback, arg ) {
 371                 var length, value,
 372                         i = 0,
 373                         ret = [];
 374
 375                 // Go through the array, translating each of the items to their new values
 376                 if ( isArrayLike( elems ) ) {
 377                         length = elems.length;
 378                         for ( ; i < length; i++ ) {
 379                                 value = callback( elems[ i ], i, arg );
 380
 381                                 if ( value != null ) {
 382                                         ret.push( value );
 383                                 }
 384                         }
 385
 386                 // Go through every key on the object,
 387                 } else {
 388                         for ( i in elems ) {
 389                                 value = callback( elems[ i ], i, arg );
 390
 391                                 if ( value != null ) {
 392                                         ret.push( value );
 393                                 }
 394                         }
 395                 }
 396
 397                 // Flatten any nested arrays
 398                 return flat( ret );
 399         },
 400
 401         // A global GUID counter for objects
 402         guid: 1,
 403
 404         // jQuery.support is not used in Core but other projects attach their
 405         // properties to it so it needs to exist.
 406         support: support
 407 } );
 408
 409 if ( typeof Symbol === "function" ) {
 410         jQuery.fn[ Symbol.iterator ] = arr[ Symbol.iterator ];
 411 }
 412
 413 // Populate the class2type map
 414 jQuery.each( "Boolean Number String Function Array Date RegExp Object Error Symbol".split( " " ),
 415         function( _i, name ) {
 416                 class2type[ "[object " + name + "]" ] = name.toLowerCase();
 417         } );
 418
 419 export default jQuery;