“use strict”; const internalQuerySelector = require(“./selectors”).querySelector; const whatwgURL = require(“whatwg-url”);
exports.documentBaseURL = document => {
// https://html.spec.whatwg.org/multipage/infrastructure.html#document-base-url const firstBase = internalQuerySelector(document, "base[href]"); const fallbackBaseURL = exports.fallbackBaseURL(document); if (firstBase === null) { return fallbackBaseURL; } return frozenBaseURL(firstBase, fallbackBaseURL);
};
exports.documentBaseURLSerialized = document => {
return whatwgURL.serializeURL(exports.documentBaseURL(document));
};
exports.fallbackBaseURL = document => {
// https://html.spec.whatwg.org/multipage/infrastructure.html#fallback-base-url // Unimplemented: <iframe srcdoc> if (document.URL === "about:blank" && document._defaultView && document._defaultView._parent !== document._defaultView) { return exports.documentBaseURL(document._defaultView._parent._document); } return document._URL;
};
exports.parseURLToResultingURLRecord = (url, document) => {
// https://html.spec.whatwg.org/#resolve-a-url // Encoding stuff ignored; always UTF-8 for us, for now. const baseURL = exports.documentBaseURL(document); return whatwgURL.parseURL(url, { baseURL }); // This returns the resulting URL record; to get the resulting URL string, just serialize it.
};
function frozenBaseURL(baseElement, fallbackBaseURL) {
// https://html.spec.whatwg.org/multipage/semantics.html#frozen-base-url // The spec is eager (setting the frozen base URL when things change); we are lazy (getting it when we need to) const baseHrefAttribute = baseElement.getAttribute("href"); const result = whatwgURL.parseURL(baseHrefAttribute, { baseURL: fallbackBaseURL }); return result === "failure" ? fallbackBaseURL : result;
}