getElementsByXPath と getFirstElementByXPath

http://userscripts.org/scripts/review/8551
AutoPagerize version: 0.0.36 2009-03-08T14:43:37+09:00

function getElementsByXPath(xpath, node) {
    var nodesSnapshot = getXPathResult(xpath, node,
        XPathResult.ORDERED_NODE_SNAPSHOT_TYPE)
    var data = []
    for (var i = 0; i < nodesSnapshot.snapshotLength; i++) {
        data.push(nodesSnapshot.snapshotItem(i))
    }
    return data
}

function getFirstElementByXPath(xpath, node) {
    var result = getXPathResult(xpath, node,
        XPathResult.FIRST_ORDERED_NODE_TYPE)
    return result.singleNodeValue
}

function getXPathResult(xpath, node, resultType) {
    var node = node || document
    var doc = node.ownerDocument || node
    var resolver = doc.createNSResolver(node.documentElement || node)
    // Use |node.lookupNamespaceURI('')| for Opera 9.5
    var defaultNS = node.lookupNamespaceURI(null)
    if (defaultNS) {
        const defaultPrefix = '__default__'
        xpath = addDefaultPrefix(xpath, defaultPrefix)
        var defaultResolver = resolver
        resolver = function (prefix) {
            return (prefix == defaultPrefix)
                ? defaultNS : defaultResolver.lookupNamespaceURI(prefix)
        }
    }
    return doc.evaluate(xpath, node, resolver, resultType, null)
}

getXPathResult と getElementsByXPath と getFirstElementByXPath 。