/
sizzle.js
1993 lines (1708 loc) · 55.4 KB
/
sizzle.js
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/*!
* Sizzle CSS Selector Engine v@VERSION
* http://sizzlejs.com/
*
* Copyright 2013 jQuery Foundation, Inc. and other contributors
* Released under the MIT license
* http://jquery.org/license
*
* Date: @DATE
*/
(function( window ) {
var i,
support,
cachedruns,
Expr,
getText,
isXML,
compile,
outermostContext,
sortInput,
hasDuplicate,
// Local document vars
setDocument,
document,
docElem,
documentIsHTML,
rbuggyQSA,
rbuggyMatches,
matches,
contains,
// Instance-specific data
expando = "sizzle" + -(new Date()),
preferredDoc = window.document,
dirruns = 0,
done = 0,
classCache = createCache(),
tokenCache = createCache(),
compilerCache = createCache(),
sortOrder = function( a, b ) {
if ( a === b ) {
hasDuplicate = true;
}
return 0;
},
// General-purpose constants
strundefined = typeof undefined,
MAX_NEGATIVE = 1 << 31,
// Instance methods
hasOwn = ({}).hasOwnProperty,
arr = [],
pop = arr.pop,
push_native = arr.push,
push = arr.push,
slice = arr.slice,
// Use a stripped-down indexOf if we can't use a native one
indexOf = arr.indexOf || function( elem ) {
var i = 0,
len = this.length;
for ( ; i < len; i++ ) {
if ( this[i] === elem ) {
return i;
}
}
return -1;
},
booleans = "checked|selected|async|autofocus|autoplay|controls|defer|disabled|hidden|ismap|loop|multiple|open|readonly|required|scoped",
// Regular expressions
// Whitespace characters http://www.w3.org/TR/css3-selectors/#whitespace
whitespace = "[\\x20\\t\\r\\n\\f]",
// http://www.w3.org/TR/css3-syntax/#characters
characterEncoding = "(?:\\\\.|[\\w-]|[^\\x00-\\xa0])+",
// Loosely modeled on CSS identifier characters
// An unquoted value should be a CSS identifier http://www.w3.org/TR/css3-selectors/#attribute-selectors
// Proper syntax: http://www.w3.org/TR/CSS21/syndata.html#value-def-identifier
identifier = characterEncoding.replace( "w", "w#" ),
// Acceptable operators http://www.w3.org/TR/selectors/#attribute-selectors
attributes = "\\[" + whitespace + "*(" + characterEncoding + ")" + whitespace +
"*(?:([*^$|!~]?=)" + whitespace + "*(?:(['\"])((?:\\\\.|[^\\\\])*?)\\3|(" + identifier + ")|)|)" + whitespace + "*\\]",
// Prefer arguments quoted,
// then not containing pseudos/brackets,
// then attribute selectors/non-parenthetical expressions,
// then anything else
// These preferences are here to reduce the number of selectors
// needing tokenize in the PSEUDO preFilter
pseudos = ":(" + characterEncoding + ")(?:\\(((['\"])((?:\\\\.|[^\\\\])*?)\\3|((?:\\\\.|[^\\\\()[\\]]|" + attributes.replace( 3, 8 ) + ")*)|.*)\\)|)",
// Leading and non-escaped trailing whitespace, capturing some non-whitespace characters preceding the latter
rtrim = new RegExp( "^" + whitespace + "+|((?:^|[^\\\\])(?:\\\\.)*)" + whitespace + "+$", "g" ),
rcomma = new RegExp( "^" + whitespace + "*," + whitespace + "*" ),
rcombinators = new RegExp( "^" + whitespace + "*([>+~]|" + whitespace + ")" + whitespace + "*" ),
rattributeQuotes = new RegExp( "=" + whitespace + "*([^\\]'\"]*)" + whitespace + "*\\]", "g" ),
rpseudo = new RegExp( pseudos ),
ridentifier = new RegExp( "^" + identifier + "$" ),
matchExpr = {
"ID": new RegExp( "^#(" + characterEncoding + ")" ),
"CLASS": new RegExp( "^\\.(" + characterEncoding + ")" ),
"TAG": new RegExp( "^(" + characterEncoding.replace( "w", "w*" ) + ")" ),
"ATTR": new RegExp( "^" + attributes ),
"PSEUDO": new RegExp( "^" + pseudos ),
"CHILD": new RegExp( "^:(only|first|last|nth|nth-last)-(child|of-type)(?:\\(" + whitespace +
"*(even|odd|(([+-]|)(\\d*)n|)" + whitespace + "*(?:([+-]|)" + whitespace +
"*(\\d+)|))" + whitespace + "*\\)|)", "i" ),
"bool": new RegExp( "^(?:" + booleans + ")$", "i" ),
// For use in libraries implementing .is()
// We use this for POS matching in `select`
"needsContext": new RegExp( "^" + whitespace + "*[>+~]|:(even|odd|eq|gt|lt|nth|first|last)(?:\\(" +
whitespace + "*((?:-\\d)?\\d*)" + whitespace + "*\\)|)(?=[^-]|$)", "i" )
},
rinputs = /^(?:input|select|textarea|button)$/i,
rheader = /^h\d$/i,
rnative = /^[^{]+\{\s*\[native \w/,
// Easily-parseable/retrievable ID or TAG or CLASS selectors
rquickExpr = /^(?:#([\w-]+)|(\w+)|\.([\w-]+))$/,
rsibling = /[+~]/,
rescape = /'|\\/g,
// CSS escapes http://www.w3.org/TR/CSS21/syndata.html#escaped-characters
runescape = new RegExp( "\\\\([\\da-f]{1,6}" + whitespace + "?|(" + whitespace + ")|.)", "ig" ),
funescape = function( _, escaped, escapedWhitespace ) {
var high = "0x" + escaped - 0x10000;
// NaN means non-codepoint
// Support: Firefox
// Workaround erroneous numeric interpretation of +"0x"
return high !== high || escapedWhitespace ?
escaped :
high < 0 ?
// BMP codepoint
String.fromCharCode( high + 0x10000 ) :
// Supplemental Plane codepoint (surrogate pair)
String.fromCharCode( high >> 10 | 0xD800, high & 0x3FF | 0xDC00 );
};
// Optimize for push.apply( _, NodeList )
try {
push.apply(
(arr = slice.call( preferredDoc.childNodes )),
preferredDoc.childNodes
);
// Support: Android<4.0
// Detect silently failing push.apply
arr[ preferredDoc.childNodes.length ].nodeType;
} catch ( e ) {
push = { apply: arr.length ?
// Leverage slice if possible
function( target, els ) {
push_native.apply( target, slice.call(els) );
} :
// Support: IE<9
// Otherwise append directly
function( target, els ) {
var j = target.length,
i = 0;
// Can't trust NodeList.length
while ( (target[j++] = els[i++]) ) {}
target.length = j - 1;
}
};
}
function Sizzle( selector, context, results, seed ) {
var match, elem, m, nodeType,
// QSA vars
i, groups, old, nid, newContext, newSelector;
if ( ( context ? context.ownerDocument || context : preferredDoc ) !== document ) {
setDocument( context );
}
context = context || document;
results = results || [];
if ( !selector || typeof selector !== "string" ) {
return results;
}
if ( (nodeType = context.nodeType) !== 1 && nodeType !== 9 ) {
return [];
}
if ( documentIsHTML && !seed ) {
// Shortcuts
if ( (match = rquickExpr.exec( selector )) ) {
// Speed-up: Sizzle("#ID")
if ( (m = match[1]) ) {
if ( nodeType === 9 ) {
elem = context.getElementById( m );
// Check parentNode to catch when Blackberry 4.6 returns
// nodes that are no longer in the document (jQuery #6963)
if ( elem && elem.parentNode ) {
// Handle the case where IE, Opera, and Webkit return items
// by name instead of ID
if ( elem.id === m ) {
results.push( elem );
return results;
}
} else {
return results;
}
} else {
// Context is not a document
if ( context.ownerDocument && (elem = context.ownerDocument.getElementById( m )) &&
contains( context, elem ) && elem.id === m ) {
results.push( elem );
return results;
}
}
// Speed-up: Sizzle("TAG")
} else if ( match[2] ) {
push.apply( results, context.getElementsByTagName( selector ) );
return results;
// Speed-up: Sizzle(".CLASS")
} else if ( (m = match[3]) && support.getElementsByClassName && context.getElementsByClassName ) {
push.apply( results, context.getElementsByClassName( m ) );
return results;
}
}
// QSA path
if ( support.qsa && (!rbuggyQSA || !rbuggyQSA.test( selector )) ) {
nid = old = expando;
newContext = context;
newSelector = nodeType === 9 && selector;
// qSA works strangely on Element-rooted queries
// We can work around this by specifying an extra ID on the root
// and working up from there (Thanks to Andrew Dupont for the technique)
// IE 8 doesn't work on object elements
if ( nodeType === 1 && context.nodeName.toLowerCase() !== "object" ) {
groups = tokenize( selector );
if ( (old = context.getAttribute("id")) ) {
nid = old.replace( rescape, "\\$&" );
} else {
context.setAttribute( "id", nid );
}
nid = "[id='" + nid + "'] ";
i = groups.length;
while ( i-- ) {
groups[i] = nid + toSelector( groups[i] );
}
newContext = rsibling.test( selector ) && testContext( context.parentNode ) || context;
newSelector = groups.join(",");
}
if ( newSelector ) {
try {
push.apply( results,
newContext.querySelectorAll( newSelector )
);
return results;
} catch(qsaError) {
} finally {
if ( !old ) {
context.removeAttribute("id");
}
}
}
}
}
// All others
return select( selector.replace( rtrim, "$1" ), context, results, seed );
}
/**
* Create key-value caches of limited size
* @returns {Function(string, Object)} Returns the Object data after storing it on itself with
* property name the (space-suffixed) string and (if the cache is larger than Expr.cacheLength)
* deleting the oldest entry
*/
function createCache() {
var keys = [];
function cache( key, value ) {
// Use (key + " ") to avoid collision with native prototype properties (see Issue #157)
if ( keys.push( key + " " ) > Expr.cacheLength ) {
// Only keep the most recent entries
delete cache[ keys.shift() ];
}
return (cache[ key + " " ] = value);
}
return cache;
}
/**
* Mark a function for special use by Sizzle
* @param {Function} fn The function to mark
*/
function markFunction( fn ) {
fn[ expando ] = true;
return fn;
}
/**
* Support testing using an element
* @param {Function} fn Passed the created div and expects a boolean result
*/
function assert( fn ) {
var div = document.createElement("div");
try {
return !!fn( div );
} catch (e) {
return false;
} finally {
// Remove from its parent by default
if ( div.parentNode ) {
div.parentNode.removeChild( div );
}
// release memory in IE
div = null;
}
}
/**
* Adds the same handler for all of the specified attrs
* @param {String} attrs Pipe-separated list of attributes
* @param {Function} handler The method that will be applied
*/
function addHandle( attrs, handler ) {
var arr = attrs.split("|"),
i = attrs.length;
while ( i-- ) {
Expr.attrHandle[ arr[i] ] = handler;
}
}
/**
* Checks document order of two siblings
* @param {Element} a
* @param {Element} b
* @returns {Number} Returns less than 0 if a precedes b, greater than 0 if a follows b
*/
function siblingCheck( a, b ) {
var cur = b && a,
diff = cur && a.nodeType === 1 && b.nodeType === 1 &&
( ~b.sourceIndex || MAX_NEGATIVE ) -
( ~a.sourceIndex || MAX_NEGATIVE );
// Use IE sourceIndex if available on both nodes
if ( diff ) {
return diff;
}
// Check if b follows a
if ( cur ) {
while ( (cur = cur.nextSibling) ) {
if ( cur === b ) {
return -1;
}
}
}
return a ? 1 : -1;
}
/**
* Returns a function to use in pseudos for input types
* @param {String} type
*/
function createInputPseudo( type ) {
return function( elem ) {
var name = elem.nodeName.toLowerCase();
return name === "input" && elem.type === type;
};
}
/**
* Returns a function to use in pseudos for buttons
* @param {String} type
*/
function createButtonPseudo( type ) {
return function( elem ) {
var name = elem.nodeName.toLowerCase();
return (name === "input" || name === "button") && elem.type === type;
};
}
/**
* Returns a function to use in pseudos for positionals
* @param {Function} fn
*/
function createPositionalPseudo( fn ) {
return markFunction(function( argument ) {
argument = +argument;
return markFunction(function( seed, matches ) {
var j,
matchIndexes = fn( [], seed.length, argument ),
i = matchIndexes.length;
// Match elements found at the specified indexes
while ( i-- ) {
if ( seed[ (j = matchIndexes[i]) ] ) {
seed[j] = !(matches[j] = seed[j]);
}
}
});
});
}
/**
* Checks a node for validity as a Sizzle context
* @param {Element|Object=} context
* @returns {Element|Object|Boolean} The input node if acceptable, otherwise a falsy value
*/
function testContext( context ) {
return context && typeof context.getElementsByTagName !== strundefined && context;
}
// Expose support vars for convenience
support = Sizzle.support = {};
/**
* Detects XML nodes
* @param {Element|Object} elem An element or a document
* @returns {Boolean} True iff elem is a non-HTML XML node
*/
isXML = Sizzle.isXML = function( elem ) {
// documentElement is verified for cases where it doesn't yet exist
// (such as loading iframes in IE - #4833)
var documentElement = elem && (elem.ownerDocument || elem).documentElement;
return documentElement ? documentElement.nodeName !== "HTML" : false;
};
/**
* Sets document-related variables once based on the current document
* @param {Element|Object} [doc] An element or document object to use to set the document
* @returns {Object} Returns the current document
*/
setDocument = Sizzle.setDocument = function( node ) {
var doc = node ? node.ownerDocument || node : preferredDoc,
parent = doc.defaultView;
// If no document and documentElement is available, return
if ( doc === document || doc.nodeType !== 9 || !doc.documentElement ) {
return document;
}
// Set our document
document = doc;
docElem = doc.documentElement;
// Support tests
documentIsHTML = !isXML( doc );
// Support: IE>8
// If iframe document is assigned to "document" variable and if iframe has been reloaded,
// IE will throw "permission denied" error when accessing "document" variable, see jQuery #13936
// IE6-8 do not support the defaultView property so parent will be undefined
if ( parent && parent.attachEvent && parent !== parent.top ) {
parent.attachEvent( "onbeforeunload", function() {
setDocument();
});
}
/* Attributes
---------------------------------------------------------------------- */
// Support: IE<8
// Verify that getAttribute really returns attributes and not properties (excepting IE8 booleans)
support.attributes = assert(function( div ) {
div.className = "i";
return !div.getAttribute("className");
});
/* getElement(s)By*
---------------------------------------------------------------------- */
// Check if getElementsByTagName("*") returns only elements
support.getElementsByTagName = assert(function( div ) {
div.appendChild( doc.createComment("") );
return !div.getElementsByTagName("*").length;
});
// Check if getElementsByClassName can be trusted
support.getElementsByClassName = assert(function( div ) {
div.innerHTML = "<div class='a'></div><div class='a i'></div>";
// Support: Safari<4
// Catch class over-caching
div.firstChild.className = "i";
// Support: Opera<10
// Catch gEBCN failure to find non-leading classes
return div.getElementsByClassName("i").length === 2;
});
// Support: IE<10
// Check if getElementById returns elements by name
// The broken getElementById methods don't pick up programatically-set names,
// so use a roundabout getElementsByName test
support.getById = assert(function( div ) {
docElem.appendChild( div ).id = expando;
return !doc.getElementsByName || !doc.getElementsByName( expando ).length;
});
// ID find and filter
if ( support.getById ) {
Expr.find["ID"] = function( id, context ) {
if ( typeof context.getElementById !== strundefined && documentIsHTML ) {
var m = context.getElementById( id );
// Check parentNode to catch when Blackberry 4.6 returns
// nodes that are no longer in the document #6963
return m && m.parentNode ? [m] : [];
}
};
Expr.filter["ID"] = function( id ) {
var attrId = id.replace( runescape, funescape );
return function( elem ) {
return elem.getAttribute("id") === attrId;
};
};
} else {
// Support: IE6/7
// getElementById is not reliable as a find shortcut
delete Expr.find["ID"];
Expr.filter["ID"] = function( id ) {
var attrId = id.replace( runescape, funescape );
return function( elem ) {
var node = typeof elem.getAttributeNode !== strundefined && elem.getAttributeNode("id");
return node && node.value === attrId;
};
};
}
// Tag
Expr.find["TAG"] = support.getElementsByTagName ?
function( tag, context ) {
if ( typeof context.getElementsByTagName !== strundefined ) {
return context.getElementsByTagName( tag );
}
} :
function( tag, context ) {
var elem,
tmp = [],
i = 0,
results = context.getElementsByTagName( tag );
// Filter out possible comments
if ( tag === "*" ) {
while ( (elem = results[i++]) ) {
if ( elem.nodeType === 1 ) {
tmp.push( elem );
}
}
return tmp;
}
return results;
};
// Class
Expr.find["CLASS"] = support.getElementsByClassName && function( className, context ) {
if ( typeof context.getElementsByClassName !== strundefined && documentIsHTML ) {
return context.getElementsByClassName( className );
}
};
/* QSA/matchesSelector
---------------------------------------------------------------------- */
// QSA and matchesSelector support
// matchesSelector(:active) reports false when true (IE9/Opera 11.5)
rbuggyMatches = [];
// qSa(:focus) reports false when true (Chrome 21)
// We allow this because of a bug in IE8/9 that throws an error
// whenever `document.activeElement` is accessed on an iframe
// So, we allow :focus to pass through QSA all the time to avoid the IE error
// See http://bugs.jquery.com/ticket/13378
rbuggyQSA = [];
if ( (support.qsa = rnative.test( doc.querySelectorAll )) ) {
// Build QSA regex
// Regex strategy adopted from Diego Perini
assert(function( div ) {
// Select is set to empty string on purpose
// This is to test IE's treatment of not explicitly
// setting a boolean content attribute,
// since its presence should be enough
// http://bugs.jquery.com/ticket/12359
div.innerHTML = "<select><option selected=''></option></select>";
// Support: IE8
// Boolean attributes and "value" are not treated correctly
if ( !div.querySelectorAll("[selected]").length ) {
rbuggyQSA.push( "\\[" + whitespace + "*(?:value|" + booleans + ")" );
}
// Webkit/Opera - :checked should return selected option elements
// http://www.w3.org/TR/2011/REC-css3-selectors-20110929/#checked
// IE8 throws error here and will not see later tests
if ( !div.querySelectorAll(":checked").length ) {
rbuggyQSA.push(":checked");
}
});
assert(function( div ) {
// Support: Opera 10-12/IE8
// ^= $= *= and empty values
// Should not select anything
// Support: Windows 8 Native Apps
// The type attribute is restricted during .innerHTML assignment
var input = doc.createElement("input");
input.setAttribute( "type", "hidden" );
div.appendChild( input ).setAttribute( "t", "" );
if ( div.querySelectorAll("[t^='']").length ) {
rbuggyQSA.push( "[*^$]=" + whitespace + "*(?:''|\"\")" );
}
// FF 3.5 - :enabled/:disabled and hidden elements (hidden elements are still enabled)
// IE8 throws error here and will not see later tests
if ( !div.querySelectorAll(":enabled").length ) {
rbuggyQSA.push( ":enabled", ":disabled" );
}
// Opera 10-11 does not throw on post-comma invalid pseudos
div.querySelectorAll("*,:x");
rbuggyQSA.push(",.*:");
});
}
if ( (support.matchesSelector = rnative.test( (matches = docElem.webkitMatchesSelector ||
docElem.mozMatchesSelector ||
docElem.oMatchesSelector ||
docElem.msMatchesSelector) )) ) {
assert(function( div ) {
// Check to see if it's possible to do matchesSelector
// on a disconnected node (IE 9)
support.disconnectedMatch = matches.call( div, "div" );
// This should fail with an exception
// Gecko does not error, returns false instead
matches.call( div, "[s!='']:x" );
rbuggyMatches.push( "!=", pseudos );
});
}
rbuggyQSA = rbuggyQSA.length && new RegExp( rbuggyQSA.join("|") );
rbuggyMatches = rbuggyMatches.length && new RegExp( rbuggyMatches.join("|") );
/* Contains
---------------------------------------------------------------------- */
// Element contains another
// Purposefully does not implement inclusive descendent
// As in, an element does not contain itself
contains = rnative.test( docElem.contains ) || docElem.compareDocumentPosition ?
function( a, b ) {
var adown = a.nodeType === 9 ? a.documentElement : a,
bup = b && b.parentNode;
return a === bup || !!( bup && bup.nodeType === 1 && (
adown.contains ?
adown.contains( bup ) :
a.compareDocumentPosition && a.compareDocumentPosition( bup ) & 16
));
} :
function( a, b ) {
if ( b ) {
while ( (b = b.parentNode) ) {
if ( b === a ) {
return true;
}
}
}
return false;
};
/* Sorting
---------------------------------------------------------------------- */
// Document order sorting
sortOrder = docElem.compareDocumentPosition ?
function( a, b ) {
// Flag for duplicate removal
if ( a === b ) {
hasDuplicate = true;
return 0;
}
var compare = b.compareDocumentPosition && a.compareDocumentPosition && a.compareDocumentPosition( b );
if ( compare ) {
// Disconnected nodes
if ( compare & 1 ||
(!support.sortDetached && b.compareDocumentPosition( a ) === compare) ) {
// Choose the first element that is related to our preferred document
if ( a === doc || contains(preferredDoc, a) ) {
return -1;
}
if ( b === doc || contains(preferredDoc, b) ) {
return 1;
}
// Maintain original order
return sortInput ?
( indexOf.call( sortInput, a ) - indexOf.call( sortInput, b ) ) :
0;
}
return compare & 4 ? -1 : 1;
}
// Not directly comparable, sort on existence of method
return a.compareDocumentPosition ? -1 : 1;
} :
function( a, b ) {
var cur,
i = 0,
aup = a.parentNode,
bup = b.parentNode,
ap = [ a ],
bp = [ b ];
// Exit early if the nodes are identical
if ( a === b ) {
hasDuplicate = true;
return 0;
// Parentless nodes are either documents or disconnected
} else if ( !aup || !bup ) {
return a === doc ? -1 :
b === doc ? 1 :
aup ? -1 :
bup ? 1 :
sortInput ?
( indexOf.call( sortInput, a ) - indexOf.call( sortInput, b ) ) :
0;
// If the nodes are siblings, we can do a quick check
} else if ( aup === bup ) {
return siblingCheck( a, b );
}
// Otherwise we need full lists of their ancestors for comparison
cur = a;
while ( (cur = cur.parentNode) ) {
ap.unshift( cur );
}
cur = b;
while ( (cur = cur.parentNode) ) {
bp.unshift( cur );
}
// Walk down the tree looking for a discrepancy
while ( ap[i] === bp[i] ) {
i++;
}
return i ?
// Do a sibling check if the nodes have a common ancestor
siblingCheck( ap[i], bp[i] ) :
// Otherwise nodes in our document sort first
ap[i] === preferredDoc ? -1 :
bp[i] === preferredDoc ? 1 :
0;
};
return doc;
};
Sizzle.matches = function( expr, elements ) {
return Sizzle( expr, null, null, elements );
};
Sizzle.matchesSelector = function( elem, expr ) {
// Set document vars if needed
if ( ( elem.ownerDocument || elem ) !== document ) {
setDocument( elem );
}
// Make sure that attribute selectors are quoted
expr = expr.replace( rattributeQuotes, "='$1']" );
if ( support.matchesSelector && documentIsHTML &&
( !rbuggyMatches || !rbuggyMatches.test( expr ) ) &&
( !rbuggyQSA || !rbuggyQSA.test( expr ) ) ) {
try {
var ret = matches.call( elem, expr );
// IE 9's matchesSelector returns false on disconnected nodes
if ( ret || support.disconnectedMatch ||
// As well, disconnected nodes are said to be in a document
// fragment in IE 9
elem.document && elem.document.nodeType !== 11 ) {
return ret;
}
} catch(e) {}
}
return Sizzle( expr, document, null, [elem] ).length > 0;
};
Sizzle.contains = function( context, elem ) {
// Set document vars if needed
if ( ( context.ownerDocument || context ) !== document ) {
setDocument( context );
}
return contains( context, elem );
};
Sizzle.attr = function( elem, name ) {
// Set document vars if needed
if ( ( elem.ownerDocument || elem ) !== document ) {
setDocument( elem );
}
var fn = Expr.attrHandle[ name.toLowerCase() ],
// Don't get fooled by Object.prototype properties (jQuery #13807)
val = fn && hasOwn.call( Expr.attrHandle, name.toLowerCase() ) ?
fn( elem, name, !documentIsHTML ) :
undefined;
return val !== undefined ?
val :
support.attributes || !documentIsHTML ?
elem.getAttribute( name ) :
(val = elem.getAttributeNode(name)) && val.specified ?
val.value :
null;
};
Sizzle.error = function( msg ) {
throw new Error( "Syntax error, unrecognized expression: " + msg );
};
/**
* Document sorting and removing duplicates
* @param {ArrayLike} results
*/
Sizzle.uniqueSort = function( results ) {
var elem,
duplicates = [],
j = 0,
i = 0;
// Unless we *know* we can detect duplicates, assume their presence
hasDuplicate = !support.detectDuplicates;
sortInput = !support.sortStable && results.slice( 0 );
results.sort( sortOrder );
if ( hasDuplicate ) {
while ( (elem = results[i++]) ) {
if ( elem === results[ i ] ) {
j = duplicates.push( i );
}
}
while ( j-- ) {
results.splice( duplicates[ j ], 1 );
}
}
return results;
};
/**
* Utility function for retrieving the text value of an array of DOM nodes
* @param {Array|Element} elem
*/
getText = Sizzle.getText = function( elem ) {
var node,
ret = "",
i = 0,
nodeType = elem.nodeType;
if ( !nodeType ) {
// If no nodeType, this is expected to be an array
while ( (node = elem[i++]) ) {
// Do not traverse comment nodes
ret += getText( node );
}
} else if ( nodeType === 1 || nodeType === 9 || nodeType === 11 ) {
// Use textContent for elements
// innerText usage removed for consistency of new lines (jQuery #11153)
if ( typeof elem.textContent === "string" ) {
return elem.textContent;
} else {
// Traverse its children
for ( elem = elem.firstChild; elem; elem = elem.nextSibling ) {
ret += getText( elem );
}
}
} else if ( nodeType === 3 || nodeType === 4 ) {
return elem.nodeValue;
}
// Do not include comment or processing instruction nodes
return ret;
};
Expr = Sizzle.selectors = {
// Can be adjusted by the user
cacheLength: 50,
createPseudo: markFunction,
match: matchExpr,
attrHandle: {},
find: {},
relative: {
">": { dir: "parentNode", first: true },
" ": { dir: "parentNode" },
"+": { dir: "previousSibling", first: true },
"~": { dir: "previousSibling" }
},
preFilter: {
"ATTR": function( match ) {
match[1] = match[1].replace( runescape, funescape );
// Move the given value to match[3] whether quoted or unquoted
match[3] = ( match[4] || match[5] || "" ).replace( runescape, funescape );
if ( match[2] === "~=" ) {
match[3] = " " + match[3] + " ";
}
return match.slice( 0, 4 );
},
"CHILD": function( match ) {
/* matches from matchExpr["CHILD"]
1 type (only|nth|...)
2 what (child|of-type)
3 argument (even|odd|\d*|\d*n([+-]\d+)?|...)
4 xn-component of xn+y argument ([+-]?\d*n|)
5 sign of xn-component
6 x of xn-component
7 sign of y-component
8 y of y-component
*/
match[1] = match[1].toLowerCase();
if ( match[1].slice( 0, 3 ) === "nth" ) {
// nth-* requires argument
if ( !match[3] ) {
Sizzle.error( match[0] );
}
// numeric x and y parameters for Expr.filter.CHILD
// remember that false/true cast respectively to 0/1
match[4] = +( match[4] ? match[5] + (match[6] || 1) : 2 * ( match[3] === "even" || match[3] === "odd" ) );
match[5] = +( ( match[7] + match[8] ) || match[3] === "odd" );
// other types prohibit arguments
} else if ( match[3] ) {
Sizzle.error( match[0] );
}
return match;
},
"PSEUDO": function( match ) {
var excess,
unquoted = !match[5] && match[2];
if ( matchExpr["CHILD"].test( match[0] ) ) {
return null;
}
// Accept quoted arguments as-is
if ( match[3] && match[4] !== undefined ) {