Function createXPathFromElement

Pagetual/pagetual.user.js:4719–4755

(elm)

    }

    function createXPathFromElement(elm) {
        let allNodes = document.getElementsByTagName('*'), segs;
        for (segs = []; elm && elm.nodeType === 1; elm = elm.parentNode) {
            if (compareNodeName(elm, ["body", "html"])) {
                segs.unshift(elm.localName.toLowerCase());
                continue;
            }
            if (elm.hasAttribute && elm.hasAttribute('id')) {
                var uniqueIdCount = 0;
                for (var n = 0; n < allNodes.length; n++) {
                    if (allNodes[n].hasAttribute('id') && allNodes[n].id === elm.id) {
                      uniqueIdCount++;
                    }
                    if (uniqueIdCount > 1) {
                      break;
                    }
                }
                if ( uniqueIdCount === 1) {
                    segs.unshift('id("' + elm.getAttribute('id') + '")');
                    return segs.join('/');
                } else {
                    segs.unshift(elm.localName.toLowerCase() + '[@id="' + elm.getAttribute('id') + '"]');
                }
            } else if (elm.hasAttribute && elm.hasAttribute('class')) {
                segs.unshift(elm.localName.toLowerCase() + '[@class="' + elm.getAttribute('class') + '"]');
            } else {
                let i, sib;
                for (i = 1, sib = elm.previousSibling; sib; sib = sib.previousSibling) {
                    if (sib.localName === elm.localName) {
                      i++;
                    }
                }
                segs.unshift(elm.localName.toLowerCase() + '[' + i + ']');
            }
        }
        return segs.length ? '/' + segs.join('/') : null;
    }

    function createHTML(html, doc) {
        const targetDoc = doc || document;