jquery/src/core.js

// Will speed up references to window, and allows munging its name.
var window = this,

	// Will speed up references to undefined, and allows munging its name.
	undefined,

	// Map over jQuery in case of overwrite
	_jQuery = window.jQuery,

	// Map over the $ in case of overwrite
	_$ = window.$,

	// Define a local copy of jQuery
	jQuery,

	// A central reference to the root jQuery(document)
	rootjQuery,

	jQuery = window.jQuery = window.$ = function( selector, context ) {
		// The jQuery object is actually just the init constructor 'enhanced'
		return arguments.length === 0 ?
			rootjQuery :
			new jQuery.fn.init( selector, context );
	},

	// A simple way to check for HTML strings or ID strings
	// (both of which we optimize for)
	quickExpr = /^[^<]*(<(.|\s)+>)[^>]*$|^#([\w-]+)$/,

	// Is it a simple selector
	isSimple = /^.[^:#\[\.,]*$/,

	// Keep a UserAgent string for use with jQuery.browser
	userAgent = navigator.userAgent.toLowerCase(),

	// Save a reference to the core toString method
	toString = Object.prototype.toString;

jQuery.fn = jQuery.prototype = {
	init: function( selector, context ) {
		var match, elem, ret;

		// Handle $(""), $(null), or $(undefined)
		if ( !selector ) {
			this.length = 0;
			return this;
		}

		// Handle $(DOMElement)
		if ( selector.nodeType ) {
			this[0] = selector;
			this.length = 1;
			this.context = selector;
			return this;
		}

		// Handle HTML strings
		if ( typeof selector === "string" ) {
			// Are we dealing with HTML string or an ID?
			match = quickExpr.exec( selector );

			// Verify a match, and that no context was specified for #id
			if ( match && (match[1] || !context) ) {

				// HANDLE: $(html) -> $(array)
				if ( match[1] ) {
					selector = jQuery.clean( [ match[1] ], context );

				// HANDLE: $("#id")
				} else {
					elem = document.getElementById( match[3] );

					// Handle the case where IE and Opera return items
					// by name instead of ID
					if ( elem && elem.id !== match[3] ) {
						return rootjQuery.find( selector );
					}

					// Otherwise, we inject the element directly into the jQuery object
					ret = jQuery( elem || null );
					ret.context = document;
					ret.selector = selector;
					return ret;
				}

			// HANDLE: $(expr, $(...))
			} else if ( !context || context.jquery ) {
				return (context || rootjQuery).find( selector );

			// HANDLE: $(expr, context)
			// (which is just equivalent to: $(context).find(expr)
			} else {
				return jQuery( context ).find( selector );
			}

		// HANDLE: $(function)
		// Shortcut for document ready
		} else if ( jQuery.isFunction( selector ) ) {
			return rootjQuery.ready( selector );
		}

		// Make sure that old selector state is passed along
		if ( selector.selector && selector.context ) {
			this.selector = selector.selector;
			this.context = selector.context;
		}

		return this.setArray(jQuery.isArray( selector ) ?
			selector :
			jQuery.makeArray(selector));
	},

	// Start with an empty selector
	selector: "",

	// The current version of jQuery being used
	jquery: "@VERSION",

	// The number of elements contained in the matched element set
	size: function() {
		return this.length;
	},

	// Get the Nth element in the matched element set OR
	// Get the whole matched element set as a clean array
	get: function( num ) {
		return num == null ?

			// Return a 'clean' array
			Array.prototype.slice.call( this ) :

			// Return just the object
			this[ num ];
	},

	// Take an array of elements and push it onto the stack
	// (returning the new matched element set)
	pushStack: function( elems, name, selector ) {
		// Build a new jQuery matched element set
		var ret = jQuery( elems || null );

		// Add the old object onto the stack (as a reference)
		ret.prevObject = this;

		ret.context = this.context;

		if ( name === "find" ) {
			ret.selector = this.selector + (this.selector ? " " : "") + selector;
		} else if ( name ) {
			ret.selector = this.selector + "." + name + "(" + selector + ")";
		}

		// Return the newly-formed element set
		return ret;
	},

	// Force the current matched set of elements to become
	// the specified array of elements (destroying the stack in the process)
	// You should use pushStack() in order to do this, but maintain the stack
	setArray: function( elems ) {
		// Resetting the length to 0, then using the native Array push
		// is a super-fast way to populate an object with array-like properties
		this.length = 0;
		Array.prototype.push.apply( this, elems );

		return this;
	},

	// Execute a callback for every element in the matched set.
	// (You can seed the arguments with an array of args, but this is
	// only used internally.)
	each: function( callback, args ) {
		return jQuery.each( this, callback, args );
	},

	// Determine the position of an element within
	// the matched set of elements
	index: function( elem ) {
		if ( !elem || typeof elem === "string" ) {
			return jQuery.inArray( this[0],
				// If it receives a string, the selector is used
				// If it receives nothing, the siblings are used
				elem ? jQuery( elem ) : this.parent().children() );
		}
		// Locate the position of the desired element
		return jQuery.inArray(
			// If it receives a jQuery object, the first element is used
			elem.jquery ? elem[0] : elem, this );
	},

	is: function( selector ) {
		return !!selector && jQuery.multiFilter( selector, this ).length > 0;
	},

	// For internal use only.
	// Behaves like an Array's method, not like a jQuery method.
	push: [].push,
	sort: [].sort,
	splice: [].splice
};

// Give the init function the jQuery prototype for later instantiation
jQuery.fn.init.prototype = jQuery.fn;

jQuery.extend = jQuery.fn.extend = function() {
	// copy reference to target object
	var target = arguments[0] || {}, i = 1, length = arguments.length, deep = false, options, name, src, copy;

	// Handle a deep copy situation
	if ( typeof target === "boolean" ) {
		deep = target;
		target = arguments[1] || {};
		// skip the boolean and the target
		i = 2;
	}

	// Handle case when target is a string or something (possible in deep copy)
	if ( typeof target !== "object" && !jQuery.isFunction(target) ) {
		target = {};
	}

	// extend jQuery itself if only one argument is passed
	if ( length === i ) {
		target = this;
		--i;
	}

	for ( ; i < length; i++ ) {
		// Only deal with non-null/undefined values
		if ( (options = arguments[ i ]) != null ) {
			// Extend the base object
			for ( name in options ) {
				src = target[ name ];
				copy = options[ name ];

				// Prevent never-ending loop
				if ( target === copy ) {
					continue;
				}

				// Recurse if we're merging object values
				if ( deep && copy && typeof copy === "object" && !copy.nodeType ) {
					target[ name ] = jQuery.extend( deep,
						// Never move original objects, clone them
						src || ( copy.length != null ? [ ] : { } ), copy );

				// Don't bring in undefined values
				} else if ( copy !== undefined ) {
					target[ name ] = copy;
				}
			}
		}
	}

	// Return the modified object
	return target;
};

jQuery.extend({
	noConflict: function( deep ) {
		window.$ = _$;

		if ( deep ) {
			window.jQuery = _jQuery;
		}

		return jQuery;
	},

	// See test/unit/core.js for details concerning isFunction.
	// Since version 1.3, DOM methods and functions like alert
	// aren't supported. They return false on IE (#2968).
	isFunction: function( obj ) {
		return toString.call(obj) === "[object Function]";
	},

	isArray: function( obj ) {
		return toString.call(obj) === "[object Array]";
	},

	// check if an element is in a (or is an) XML document
	isXMLDoc: function( elem ) {
		return elem.nodeType === 9 && elem.documentElement.nodeName !== "HTML" ||
			!!elem.ownerDocument && elem.ownerDocument.documentElement.nodeName !== "HTML";
	},

	// Evalulates a script in a global context
	globalEval: function( data ) {
		if ( data && /\S/.test(data) ) {
			// Inspired by code by Andrea Giammarchi
			// http://webreflection.blogspot.com/2007/08/global-scope-evaluation-and-dom.html
			var head = document.getElementsByTagName("head")[0] || document.documentElement,
				script = document.createElement("script");

			script.type = "text/javascript";
			if ( jQuery.support.scriptEval ) {
				script.appendChild( document.createTextNode( data ) );
			} else {
				script.text = data;
			}

			// Use insertBefore instead of appendChild  to circumvent an IE6 bug.
			// This arises when a base node is used (#2709).
			head.insertBefore( script, head.firstChild );
			head.removeChild( script );
		}
	},

	nodeName: function( elem, name ) {
		return elem.nodeName && elem.nodeName.toUpperCase() === name.toUpperCase();
	},

	// args is for internal usage only
	each: function( object, callback, args ) {
		var name, i = 0, length = object.length;

		if ( args ) {
			if ( length === undefined ) {
				for ( name in object ) {
					if ( callback.apply( object[ name ], args ) === false ) {
						break;
					}
				}
			} else {
				for ( ; i < length; ) {
					if ( callback.apply( object[ i++ ], args ) === false ) {
						break;
					}
				}
			}

		// A special, fast, case for the most common use of each
		} else {
			if ( length === undefined ) {
				for ( name in object ) {
					if ( callback.call( object[ name ], name, object[ name ] ) === false ) {
						break;
					}
				}
			} else {
				for ( var value = object[0];
					i < length && callback.call( value, i, value ) !== false; value = object[++i] ) {}
			}
		}

		return object;
	},

	trim: function( text ) {
		return (text || "").replace( /^\s+|\s+$/g, "" );
	},

	makeArray: function( array ) {
		var ret = [], i;

		if ( array != null ) {
			i = array.length;

			// The window, strings (and functions) also have 'length'
			if ( i == null || typeof array === "string" || jQuery.isFunction(array) || array.setInterval ) {
				ret[0] = array;
			} else {
				while ( i ) {
					ret[--i] = array[i];
				}
			}
		}

		return ret;
	},

	inArray: function( elem, array ) {
		for ( var i = 0, length = array.length; i < length; i++ ) {
			if ( array[ i ] === elem ) {
				return i;
			}
		}

		return -1;
	},

	merge: function( first, second ) {
		// We have to loop this way because IE & Opera overwrite the length
		// expando of getElementsByTagName
		var i = 0, elem, pos = first.length;

		// Also, we need to make sure that the correct elements are being returned
		// (IE returns comment nodes in a '*' query)
		if ( !jQuery.support.getAll ) {
			while ( (elem = second[ i++ ]) != null ) {
				if ( elem.nodeType !== 8 ) {
					first[ pos++ ] = elem;
				}
			}

		} else {
			while ( (elem = second[ i++ ]) != null ) {
				first[ pos++ ] = elem;
			}
		}

		return first;
	},

	unique: function( array ) {
		var ret = [], done = {}, id;

		try {
			for ( var i = 0, length = array.length; i < length; i++ ) {
				id = jQuery.data( array[ i ] );

				if ( !done[ id ] ) {
					done[ id ] = true;
					ret.push( array[ i ] );
				}
			}
		} catch( e ) {
			ret = array;
		}

		return ret;
	},

	grep: function( elems, callback, inv ) {
		var ret = [];

		// Go through the array, only saving the items
		// that pass the validator function
		for ( var i = 0, length = elems.length; i < length; i++ ) {
			if ( !inv !== !callback( elems[ i ], i ) ) {
				ret.push( elems[ i ] );
			}
		}

		return ret;
	},

	map: function( elems, callback ) {
		var ret = [], value;

		// Go through the array, translating each of the items to their
		// new value (or values).
		for ( var i = 0, length = elems.length; i < length; i++ ) {
			value = callback( elems[ i ], i );

			if ( value != null ) {
				ret[ ret.length ] = value;
			}
		}

		return ret.concat.apply( [], ret );
	},

	// Use of jQuery.browser is deprecated.
	// It's included for backwards compatibility and plugins,
	// although they should work to migrate away.
	browser: {
		version: (userAgent.match( /.+(?:rv|it|ra|ie)[\/: ]([\d.]+)/ ) || [0,'0'])[1],
		safari: /webkit/.test( userAgent ),
		opera: /opera/.test( userAgent ),
		msie: /msie/.test( userAgent ) && !/opera/.test( userAgent ),
		mozilla: /mozilla/.test( userAgent ) && !/(compatible|webkit)/.test( userAgent )
	}
});

// All jQuery objects should point back to these
rootjQuery = jQuery(document);

function evalScript( i, elem ) {
	if ( elem.src ) {
		jQuery.ajax({
			url: elem.src,
			async: false,
			dataType: "script"
		});
	} else {
		jQuery.globalEval( elem.text || elem.textContent || elem.innerHTML || "" );
	}

	if ( elem.parentNode ) {
		elem.parentNode.removeChild( elem );
	}
}

function now() {
	return (new Date).getTime();
}