Function handlePOS

documentation/javascript/application.js:5769–5850

( groups, context, results, seed )

}

function handlePOS( groups, context, results, seed ) {
	var group, part, j, groupLen, token, selector,
		anchor, elements, match, matched,
		lastIndex, currentContexts, not,
		i = 0,
		len = groups.length,
		rpos = matchExpr["POS"],
		// This is generated here in case matchExpr["POS"] is extended
		rposgroups = new RegExp( "^" + rpos.source + "(?!" + whitespace + ")", "i" ),
		// This is for making sure non-participating
		// matching groups are represented cross-browser (IE6-8)
		setUndefined = function() {
			var i = 1,
				len = arguments.length - 2;
			for ( ; i < len; i++ ) {
				if ( arguments[i] === undefined ) {
					match[i] = undefined;
				}
			}
		};

	for ( ; i < len; i++ ) {
		group = groups[i];
		part = "";
		elements = seed;
		for ( j = 0, groupLen = group.length; j < groupLen; j++ ) {
			token = group[j];
			selector = token.string;
			if ( token.part === "PSEUDO" ) {
				// Reset regex index to 0
				rpos.exec("");
				anchor = 0;
				while ( (match = rpos.exec( selector )) ) {
					matched = true;
					lastIndex = rpos.lastIndex = match.index + match[0].length;
					if ( lastIndex > anchor ) {
						part += selector.slice( anchor, match.index );
						anchor = lastIndex;
						currentContexts = [ context ];

						if ( rcombinators.test(part) ) {
							if ( elements ) {
								currentContexts = elements;
							}
							elements = seed;
						}

						if ( (not = rendsWithNot.test( part )) ) {
							part = part.slice( 0, -5 ).replace( rcombinators, "$&*" );
							anchor++;
						}

						if ( match.length > 1 ) {
							match[0].replace( rposgroups, setUndefined );
						}
						elements = handlePOSGroup( part, match[1], match[2], currentContexts, elements, not );
					}
					part = "";