Function addCombinator

documentation/javascript/application.js:5633–5684

( matcher, combinator, context, xml )

}

function addCombinator( matcher, combinator, context, xml ) {
	var dir = combinator.dir,
		doneName = done++;

	if ( !matcher ) {
		// If there is no matcher to check, check against the context
		matcher = function( elem ) {
			return elem === context;
		};
	}
	return combinator.first ?
		function( elem ) {
			while ( (elem = elem[ dir ]) ) {
				if ( elem.nodeType === 1 ) {
					return matcher( elem ) && elem;
				}
			}
		} :
		xml ?
			function( elem ) {
				while ( (elem = elem[ dir ]) ) {
					if ( elem.nodeType === 1 ) {
						if ( matcher( elem ) ) {
							return elem;
						}
					}
				}
			} :
			function( elem ) {
				var cache,
					dirkey = doneName + "." + dirruns,
					cachedkey = dirkey + "." + cachedruns;
				while ( (elem = elem[ dir ]) ) {
					if ( elem.nodeType === 1 ) {
						if ( (cache = elem[ expando ]) === cachedkey ) {
							return elem.sizset;
						} else if ( typeof cache === "string" && cache.indexOf(dirkey) === 0 ) {
							if ( elem.sizset ) {
								return elem;
							}
						} else {
							elem[ expando ] = cachedkey;
							if ( matcher( elem ) ) {
								elem.sizset = true;
								return elem;
							}
							elem.sizset = false;
						}
					}
				}
			};
}

function addMatcher( higher, deeper ) {
	return higher ?