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selector.js
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selector.js
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import jQuery from "./core.js";
import nodeName from "./core/nodeName.js";
import document from "./var/document.js";
import documentElement from "./var/documentElement.js";
import indexOf from "./var/indexOf.js";
import pop from "./var/pop.js";
import push from "./var/push.js";
import whitespace from "./selector/var/whitespace.js";
import rbuggyQSA from "./selector/rbuggyQSA.js";
import isIE from "./var/isIE.js";
// The following utils are attached directly to the jQuery object.
import "./selector/contains.js";
import "./selector/escapeSelector.js";
import "./selector/uniqueSort.js";
var preferredDoc = document,
matches = documentElement.matches || documentElement.msMatchesSelector;
( function() {
var i,
Expr,
outermostContext,
// Local document vars
document,
documentElement,
documentIsHTML,
// Instance-specific data
expando = jQuery.expando,
dirruns = 0,
done = 0,
classCache = createCache(),
tokenCache = createCache(),
compilerCache = createCache(),
nonnativeSelectorCache = createCache(),
booleans = "checked|selected|async|autofocus|autoplay|controls|defer|disabled|hidden|ismap|" +
"loop|multiple|open|readonly|required|scoped",
// Regular expressions
// https://www.w3.org/TR/css-syntax-3/#ident-token-diagram
identifier = "(?:\\\\[\\da-fA-F]{1,6}" + whitespace +
"?|\\\\[^\\r\\n\\f]|[\\w-]|[^\0-\\x7f])+",
// Attribute selectors: https://www.w3.org/TR/selectors/#attribute-selectors
attributes = "\\[" + whitespace + "*(" + identifier + ")(?:" + whitespace +
// Operator (capture 2)
"*([*^$|!~]?=)" + whitespace +
// "Attribute values must be CSS identifiers [capture 5] or strings [capture 3 or capture 4]"
"*(?:'((?:\\\\.|[^\\\\'])*)'|\"((?:\\\\.|[^\\\\\"])*)\"|(" + identifier + "))|)" +
whitespace + "*\\]",
pseudos = ":(" + identifier + ")(?:\\((" +
// To reduce the number of selectors needing tokenize in the preFilter, prefer arguments:
// 1. quoted (capture 3; capture 4 or capture 5)
"('((?:\\\\.|[^\\\\'])*)'|\"((?:\\\\.|[^\\\\\"])*)\")|" +
// 2. simple (capture 6)
"((?:\\\\.|[^\\\\()[\\]]|" + attributes + ")*)|" +
// 3. anything else (capture 2)
".*" +
")\\)|)",
// Leading and non-escaped trailing whitespace, capturing some non-whitespace characters preceding the latter
rwhitespace = new RegExp( whitespace + "+", "g" ),
rtrim = new RegExp( "^" + whitespace + "+|((?:^|[^\\\\])(?:\\\\.)*)" + whitespace + "+$", "g" ),
rcomma = new RegExp( "^" + whitespace + "*," + whitespace + "*" ),
rcombinators = new RegExp( "^" + whitespace + "*([>+~]|" + whitespace + ")" +
whitespace + "*" ),
rdescend = new RegExp( whitespace + "|>" ),
rpseudo = new RegExp( pseudos ),
ridentifier = new RegExp( "^" + identifier + "$" ),
matchExpr = {
ID: new RegExp( "^#(" + identifier + ")" ),
CLASS: new RegExp( "^\\.(" + identifier + ")" ),
TAG: new RegExp( "^(" + identifier + "|[*])" ),
ATTR: new RegExp( "^" + attributes ),
PSEUDO: new RegExp( "^" + pseudos ),
CHILD: new RegExp(
"^:(only|first|last|nth|nth-last)-(child|of-type)(?:\\(" +
whitespace + "*(even|odd|(([+-]|)(\\d*)n|)" + whitespace + "*(?:([+-]|)" +
whitespace + "*(\\d+)|))" + whitespace + "*\\)|)", "i" ),
bool: new RegExp( "^(?:" + booleans + ")$", "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$/i,
// Easily-parseable/retrievable ID or TAG or CLASS selectors
rquickExpr = /^(?:#([\w-]+)|(\w+)|\.([\w-]+))$/,
rsibling = /[+~]/,
// CSS escapes
// https://www.w3.org/TR/CSS21/syndata.html#escaped-characters
runescape = new RegExp( "\\\\[\\da-fA-F]{1,6}" + whitespace +
"?|\\\\([^\\r\\n\\f])", "g" ),
funescape = function( escape, nonHex ) {
var high = "0x" + escape.slice( 1 ) - 0x10000;
if ( nonHex ) {
// Strip the backslash prefix from a non-hex escape sequence
return nonHex;
}
// Replace a hexadecimal escape sequence with the encoded Unicode code point
// Support: IE <=11+
// For values outside the Basic Multilingual Plane (BMP), manually construct a
// surrogate pair
return high < 0 ?
String.fromCharCode( high + 0x10000 ) :
String.fromCharCode( high >> 10 | 0xD800, high & 0x3FF | 0xDC00 );
},
// Used for iframes; see `setDocument`.
// Support: IE 9 - 11+
// Removing the function wrapper causes a "Permission Denied"
// error in IE.
unloadHandler = function() {
setDocument();
},
inDisabledFieldset = addCombinator(
function( elem ) {
return elem.disabled === true && nodeName( elem, "fieldset" );
},
{ dir: "parentNode", next: "legend" }
);
function selectorError( msg ) {
throw new Error( "Syntax error, unrecognized expression: " + msg );
}
function find( selector, context, results, seed ) {
var m, i, elem, nid, match, groups, newSelector,
newContext = context && context.ownerDocument,
// nodeType defaults to 9, since context defaults to document
nodeType = context ? context.nodeType : 9;
results = results || [];
// Return early from calls with invalid selector or context
if ( typeof selector !== "string" || !selector ||
nodeType !== 1 && nodeType !== 9 && nodeType !== 11 ) {
return results;
}
// Try to shortcut find operations (as opposed to filters) in HTML documents
if ( !seed ) {
setDocument( context );
context = context || document;
if ( documentIsHTML ) {
// If the selector is sufficiently simple, try using a "get*By*" DOM method
// (excepting DocumentFragment context, where the methods don't exist)
if ( nodeType !== 11 && ( match = rquickExpr.exec( selector ) ) ) {
// ID selector
if ( ( m = match[ 1 ] ) ) {
// Document context
if ( nodeType === 9 ) {
if ( ( elem = context.getElementById( m ) ) ) {
push.call( results, elem );
}
return results;
// Element context
} else {
if ( newContext && ( elem = newContext.getElementById( m ) ) &&
jQuery.contains( context, elem ) ) {
push.call( results, elem );
return results;
}
}
// Type selector
} else if ( match[ 2 ] ) {
push.apply( results, context.getElementsByTagName( selector ) );
return results;
// Class selector
} else if ( ( m = match[ 3 ] ) && context.getElementsByClassName ) {
push.apply( results, context.getElementsByClassName( m ) );
return results;
}
}
// Take advantage of querySelectorAll
if ( !nonnativeSelectorCache[ selector + " " ] &&
( !rbuggyQSA || !rbuggyQSA.test( selector ) ) ) {
newSelector = selector;
newContext = context;
// qSA considers elements outside a scoping root when evaluating child or
// descendant combinators, which is not what we want.
// In such cases, we work around the behavior by prefixing every selector in the
// list with an ID selector referencing the scope context.
// The technique has to be used as well when a leading combinator is used
// as such selectors are not recognized by querySelectorAll.
// Thanks to Andrew Dupont for this technique.
if ( nodeType === 1 &&
( rdescend.test( selector ) || rcombinators.test( selector ) ) ) {
// Expand context for sibling selectors
newContext = rsibling.test( selector ) && testContext( context.parentNode ) ||
context;
// Outside of IE, if we're not changing the context we can
// use :scope instead of an ID.
if ( newContext !== context || isIE ) {
// Capture the context ID, setting it first if necessary
if ( ( nid = context.getAttribute( "id" ) ) ) {
nid = jQuery.escapeSelector( nid );
} else {
context.setAttribute( "id", ( nid = expando ) );
}
}
// Prefix every selector in the list
groups = tokenize( selector );
i = groups.length;
while ( i-- ) {
groups[ i ] = ( nid ? "#" + nid : ":scope" ) + " " +
toSelector( groups[ i ] );
}
newSelector = groups.join( "," );
}
try {
push.apply( results,
newContext.querySelectorAll( newSelector )
);
return results;
} catch ( qsaError ) {
nonnativeSelectorCache( selector, true );
} finally {
if ( nid === expando ) {
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 jQuery selector module
* @param {Function} fn The function to mark
*/
function markFunction( fn ) {
fn[ expando ] = true;
return fn;
}
/**
* Returns a function to use in pseudos for input types
* @param {String} type
*/
function createInputPseudo( type ) {
return function( elem ) {
return nodeName( elem, "input" ) && elem.type === type;
};
}
/**
* Returns a function to use in pseudos for buttons
* @param {String} type
*/
function createButtonPseudo( type ) {
return function( elem ) {
return ( nodeName( elem, "input" ) || nodeName( elem, "button" ) ) &&
elem.type === type;
};
}
/**
* Returns a function to use in pseudos for :enabled/:disabled
* @param {Boolean} disabled true for :disabled; false for :enabled
*/
function createDisabledPseudo( disabled ) {
// Known :disabled false positives: fieldset[disabled] > legend:nth-of-type(n+2) :can-disable
return function( elem ) {
// Only certain elements can match :enabled or :disabled
// https://html.spec.whatwg.org/multipage/scripting.html#selector-enabled
// https://html.spec.whatwg.org/multipage/scripting.html#selector-disabled
if ( "form" in elem ) {
// Check for inherited disabledness on relevant non-disabled elements:
// * listed form-associated elements in a disabled fieldset
// https://html.spec.whatwg.org/multipage/forms.html#category-listed
// https://html.spec.whatwg.org/multipage/forms.html#concept-fe-disabled
// * option elements in a disabled optgroup
// https://html.spec.whatwg.org/multipage/forms.html#concept-option-disabled
// All such elements have a "form" property.
if ( elem.parentNode && elem.disabled === false ) {
// Option elements defer to a parent optgroup if present
if ( "label" in elem ) {
if ( "label" in elem.parentNode ) {
return elem.parentNode.disabled === disabled;
} else {
return elem.disabled === disabled;
}
}
// Support: IE 6 - 11+
// Use the isDisabled shortcut property to check for disabled fieldset ancestors
return elem.isDisabled === disabled ||
// Where there is no isDisabled, check manually
elem.isDisabled !== !disabled &&
inDisabledFieldset( elem ) === disabled;
}
return elem.disabled === disabled;
// Try to winnow out elements that can't be disabled before trusting the disabled property.
// Some victims get caught in our net (label, legend, menu, track), but it shouldn't
// even exist on them, let alone have a boolean value.
} else if ( "label" in elem ) {
return elem.disabled === disabled;
}
// Remaining elements are neither :enabled nor :disabled
return false;
};
}
/**
* 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 jQuery selector 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 !== "undefined" && context;
}
/**
* Sets document-related variables once based on the current document
* @param {Element|Object} [node] An element or document object to use to set the document
*/
function setDocument( node ) {
var subWindow,
doc = node ? node.ownerDocument || node : preferredDoc;
// Return early if doc is invalid or already selected
// Support: IE 11+
// IE sometimes throws a "Permission denied" error when strict-comparing
// two documents; shallow comparisons work.
// eslint-disable-next-line eqeqeq
if ( doc == document || doc.nodeType !== 9 ) {
return;
}
// Update global variables
document = doc;
documentElement = document.documentElement;
documentIsHTML = !jQuery.isXMLDoc( document );
// Support: IE 9 - 11+
// Accessing iframe documents after unload throws "permission denied" errors (jQuery #13936)
// Support: IE 11+
// IE sometimes throws a "Permission denied" error when strict-comparing
// two documents; shallow comparisons work.
// eslint-disable-next-line eqeqeq
if ( isIE && preferredDoc != document &&
( subWindow = document.defaultView ) && subWindow.top !== subWindow ) {
subWindow.addEventListener( "unload", unloadHandler );
}
}
find.matches = function( expr, elements ) {
return find( expr, null, null, elements );
};
find.matchesSelector = function( elem, expr ) {
setDocument( elem );
if ( documentIsHTML &&
!nonnativeSelectorCache[ expr + " " ] &&
( !rbuggyQSA || !rbuggyQSA.test( expr ) ) ) {
try {
return matches.call( elem, expr );
} catch ( e ) {
nonnativeSelectorCache( expr, true );
}
}
return find( expr, document, null, [ elem ] ).length > 0;
};
Expr = jQuery.expr = {
// Can be adjusted by the user
cacheLength: 50,
createPseudo: markFunction,
match: matchExpr,
find: {
ID: function( id, context ) {
if ( typeof context.getElementById !== "undefined" && documentIsHTML ) {
var elem = context.getElementById( id );
return elem ? [ elem ] : [];
}
},
TAG: function( tag, context ) {
if ( typeof context.getElementsByTagName !== "undefined" ) {
return context.getElementsByTagName( tag );
// DocumentFragment nodes don't have gEBTN
} else {
return context.querySelectorAll( tag );
}
},
CLASS: function( className, context ) {
if ( typeof context.getElementsByClassName !== "undefined" && documentIsHTML ) {
return context.getElementsByClassName( className );
}
}
},
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[ 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 ] ) {
selectorError( 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 ] ) {
selectorError( match[ 0 ] );
}
return match;
},
PSEUDO: function( match ) {
var excess,
unquoted = !match[ 6 ] && match[ 2 ];
if ( matchExpr.CHILD.test( match[ 0 ] ) ) {
return null;
}
// Accept quoted arguments as-is
if ( match[ 3 ] ) {
match[ 2 ] = match[ 4 ] || match[ 5 ] || "";
// Strip excess characters from unquoted arguments
} else if ( unquoted && rpseudo.test( unquoted ) &&
// Get excess from tokenize (recursively)
( excess = tokenize( unquoted, true ) ) &&
// advance to the next closing parenthesis
( excess = unquoted.indexOf( ")", unquoted.length - excess ) - unquoted.length ) ) {
// excess is a negative index
match[ 0 ] = match[ 0 ].slice( 0, excess );
match[ 2 ] = unquoted.slice( 0, excess );
}
// Return only captures needed by the pseudo filter method (type and argument)
return match.slice( 0, 3 );
}
},
filter: {
ID: function( id ) {
var attrId = id.replace( runescape, funescape );
return function( elem ) {
return elem.getAttribute( "id" ) === attrId;
};
},
TAG: function( nodeNameSelector ) {
var expectedNodeName = nodeNameSelector.replace( runescape, funescape ).toLowerCase();
return nodeNameSelector === "*" ?
function() {
return true;
} :
function( elem ) {
return nodeName( elem, expectedNodeName );
};
},
CLASS: function( className ) {
var pattern = classCache[ className + " " ];
return pattern ||
( pattern = new RegExp( "(^|" + whitespace + ")" + className +
"(" + whitespace + "|$)" ) ) &&
classCache( className, function( elem ) {
return pattern.test(
typeof elem.className === "string" && elem.className ||
typeof elem.getAttribute !== "undefined" &&
elem.getAttribute( "class" ) ||
""
);
} );
},
ATTR: function( name, operator, check ) {
return function( elem ) {
var result = jQuery.attr( elem, name );
if ( result == null ) {
return operator === "!=";
}
if ( !operator ) {
return true;
}
result += "";
if ( operator === "=" ) {
return result === check;
}
if ( operator === "!=" ) {
return result !== check;
}
if ( operator === "^=" ) {
return check && result.indexOf( check ) === 0;
}
if ( operator === "*=" ) {
return check && result.indexOf( check ) > -1;
}
if ( operator === "$=" ) {
return check && result.slice( -check.length ) === check;
}
if ( operator === "~=" ) {
return ( " " + result.replace( rwhitespace, " " ) + " " )
.indexOf( check ) > -1;
}
if ( operator === "|=" ) {
return result === check || result.slice( 0, check.length + 1 ) === check + "-";
}
return false;
};
},
CHILD: function( type, what, _argument, first, last ) {
var simple = type.slice( 0, 3 ) !== "nth",
forward = type.slice( -4 ) !== "last",
ofType = what === "of-type";
return first === 1 && last === 0 ?
// Shortcut for :nth-*(n)
function( elem ) {
return !!elem.parentNode;
} :
function( elem, _context, xml ) {
var cache, outerCache, node, nodeIndex, start,
dir = simple !== forward ? "nextSibling" : "previousSibling",
parent = elem.parentNode,
name = ofType && elem.nodeName.toLowerCase(),
useCache = !xml && !ofType,
diff = false;
if ( parent ) {
// :(first|last|only)-(child|of-type)
if ( simple ) {
while ( dir ) {
node = elem;
while ( ( node = node[ dir ] ) ) {
if ( ofType ?
nodeName( node, name ) :
node.nodeType === 1 ) {
return false;
}
}
// Reverse direction for :only-* (if we haven't yet done so)
start = dir = type === "only" && !start && "nextSibling";
}
return true;
}
start = [ forward ? parent.firstChild : parent.lastChild ];
// non-xml :nth-child(...) stores cache data on `parent`
if ( forward && useCache ) {
// Seek `elem` from a previously-cached index
outerCache = parent[ expando ] || ( parent[ expando ] = {} );
cache = outerCache[ type ] || [];
nodeIndex = cache[ 0 ] === dirruns && cache[ 1 ];
diff = nodeIndex && cache[ 2 ];
node = nodeIndex && parent.childNodes[ nodeIndex ];
while ( ( node = ++nodeIndex && node && node[ dir ] ||
// Fallback to seeking `elem` from the start
( diff = nodeIndex = 0 ) || start.pop() ) ) {
// When found, cache indexes on `parent` and break
if ( node.nodeType === 1 && ++diff && node === elem ) {
outerCache[ type ] = [ dirruns, nodeIndex, diff ];
break;
}
}
} else {
// Use previously-cached element index if available
if ( useCache ) {
outerCache = elem[ expando ] || ( elem[ expando ] = {} );
cache = outerCache[ type ] || [];
nodeIndex = cache[ 0 ] === dirruns && cache[ 1 ];
diff = nodeIndex;
}
// xml :nth-child(...)
// or :nth-last-child(...) or :nth(-last)?-of-type(...)
if ( diff === false ) {
// Use the same loop as above to seek `elem` from the start
while ( ( node = ++nodeIndex && node && node[ dir ] ||
( diff = nodeIndex = 0 ) || start.pop() ) ) {
if ( ( ofType ?
nodeName( node, name ) :
node.nodeType === 1 ) &&
++diff ) {
// Cache the index of each encountered element
if ( useCache ) {
outerCache = node[ expando ] ||
( node[ expando ] = {} );
outerCache[ type ] = [ dirruns, diff ];
}
if ( node === elem ) {
break;
}
}
}
}
}
// Incorporate the offset, then check against cycle size
diff -= last;
return diff === first || ( diff % first === 0 && diff / first >= 0 );
}
};
},
PSEUDO: function( pseudo, argument ) {
// pseudo-class names are case-insensitive
// https://www.w3.org/TR/selectors/#pseudo-classes
// Prioritize by case sensitivity in case custom pseudos are added with uppercase letters
// Remember that setFilters inherits from pseudos
var args,
fn = Expr.pseudos[ pseudo ] || Expr.setFilters[ pseudo.toLowerCase() ] ||
selectorError( "unsupported pseudo: " + pseudo );
// The user may use createPseudo to indicate that
// arguments are needed to create the filter function
// just as jQuery does
if ( fn[ expando ] ) {
return fn( argument );
}
// But maintain support for old signatures
if ( fn.length > 1 ) {
args = [ pseudo, pseudo, "", argument ];
return Expr.setFilters.hasOwnProperty( pseudo.toLowerCase() ) ?
markFunction( function( seed, matches ) {
var idx,
matched = fn( seed, argument ),
i = matched.length;
while ( i-- ) {
idx = indexOf.call( seed, matched[ i ] );
seed[ idx ] = !( matches[ idx ] = matched[ i ] );
}
} ) :
function( elem ) {
return fn( elem, 0, args );
};
}
return fn;
}
},
pseudos: {
// Potentially complex pseudos
not: markFunction( function( selector ) {
// Trim the selector passed to compile
// to avoid treating leading and trailing
// spaces as combinators
var input = [],
results = [],
matcher = compile( selector.replace( rtrim, "$1" ) );
return matcher[ expando ] ?
markFunction( function( seed, matches, _context, xml ) {
var elem,
unmatched = matcher( seed, null, xml, [] ),
i = seed.length;
// Match elements unmatched by `matcher`
while ( i-- ) {
if ( ( elem = unmatched[ i ] ) ) {
seed[ i ] = !( matches[ i ] = elem );
}
}
} ) :
function( elem, _context, xml ) {
input[ 0 ] = elem;
matcher( input, null, xml, results );
// Don't keep the element (issue #299)
input[ 0 ] = null;
return !results.pop();
};
} ),
has: markFunction( function( selector ) {
return function( elem ) {
return find( selector, elem ).length > 0;
};
} ),
contains: markFunction( function( text ) {
text = text.replace( runescape, funescape );
return function( elem ) {
return ( elem.textContent || jQuery.text( elem ) ).indexOf( text ) > -1;
};
} ),
// "Whether an element is represented by a :lang() selector
// is based solely on the element's language value
// being equal to the identifier C,
// or beginning with the identifier C immediately followed by "-".
// The matching of C against the element's language value is performed case-insensitively.
// The identifier C does not have to be a valid language name."
// https://www.w3.org/TR/selectors/#lang-pseudo
lang: markFunction( function( lang ) {
// lang value must be a valid identifier
if ( !ridentifier.test( lang || "" ) ) {
selectorError( "unsupported lang: " + lang );
}
lang = lang.replace( runescape, funescape ).toLowerCase();
return function( elem ) {
var elemLang;
do {
if ( ( elemLang = documentIsHTML ?
elem.lang :
elem.getAttribute( "xml:lang" ) || elem.getAttribute( "lang" ) ) ) {
elemLang = elemLang.toLowerCase();
return elemLang === lang || elemLang.indexOf( lang + "-" ) === 0;
}
} while ( ( elem = elem.parentNode ) && elem.nodeType === 1 );
return false;
};
} ),
// Miscellaneous
target: function( elem ) {
var hash = window.location && window.location.hash;
return hash && hash.slice( 1 ) === elem.id;
},
root: function( elem ) {
return elem === documentElement;
},
focus: function( elem ) {
return elem === document.activeElement &&
document.hasFocus() &&
!!( elem.type || elem.href || ~elem.tabIndex );
},
// Boolean properties
enabled: createDisabledPseudo( false ),
disabled: createDisabledPseudo( true ),
checked: function( elem ) {
// In CSS3, :checked should return both checked and selected elements
// https://www.w3.org/TR/2011/REC-css3-selectors-20110929/#checked
return ( nodeName( elem, "input" ) && !!elem.checked ) ||
( nodeName( elem, "option" ) && !!elem.selected );
},
selected: function( elem ) {
// Support: IE <=11+
// Accessing the selectedIndex property
// forces the browser to treat the default option as
// selected when in an optgroup.
if ( isIE && elem.parentNode ) {
// eslint-disable-next-line no-unused-expressions
elem.parentNode.selectedIndex;
}
return elem.selected === true;
},
// Contents
empty: function( elem ) {
// https://www.w3.org/TR/selectors/#empty-pseudo
// :empty is negated by element (1) or content nodes (text: 3; cdata: 4; entity ref: 5),
// but not by others (comment: 8; processing instruction: 7; etc.)
// nodeType < 6 works because attributes (2) do not appear as children
for ( elem = elem.firstChild; elem; elem = elem.nextSibling ) {
if ( elem.nodeType < 6 ) {
return false;
}
}
return true;
},
parent: function( elem ) {
return !Expr.pseudos.empty( elem );
},
// Element/input types
header: function( elem ) {
return rheader.test( elem.nodeName );
},
input: function( elem ) {
return rinputs.test( elem.nodeName );
},
button: function( elem ) {
return nodeName( elem, "input" ) && elem.type === "button" ||
nodeName( elem, "button" );
},
text: function( elem ) {
return nodeName( elem, "input" ) && elem.type === "text";
},
// Position-in-collection
first: createPositionalPseudo( function() {
return [ 0 ];
} ),
last: createPositionalPseudo( function( _matchIndexes, length ) {
return [ length - 1 ];
} ),
eq: createPositionalPseudo( function( _matchIndexes, length, argument ) {
return [ argument < 0 ? argument + length : argument ];
} ),
even: createPositionalPseudo( function( matchIndexes, length ) {
var i = 0;
for ( ; i < length; i += 2 ) {
matchIndexes.push( i );
}
return matchIndexes;
} ),
odd: createPositionalPseudo( function( matchIndexes, length ) {
var i = 1;
for ( ; i < length; i += 2 ) {
matchIndexes.push( i );
}
return matchIndexes;
} ),