XML-compatible soft reload.
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hackademix
parent
2e0ee1a2a7
commit
59eda23302
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@ -13,14 +13,22 @@
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{id: "fetchPolicy", url, contextUrl: url},
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callback);
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};
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debug("Initial readyState and body", document.readyState, document.body);
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if (UA.isMozilla && document.readyState !== "complete") {
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if (UA.isMozilla) {
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// Mozilla has already parsed the <head> element, we must take extra steps...
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let softReloading = true;
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debug("Early parsing: preemptively suppressing events and script execution.");
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{
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try {
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if (document.body && document.body.onload) {
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// special treatment for body[onload], which could not be suppressed otherwise
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document.body._onload = document.body.getAttribute("onload");
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document.body.removeAttribute("onload");
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document.body.onload = null;
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}
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// List updated by build.sh from https://hg.mozilla.org/mozilla-central/raw-file/tip/xpcom/ds/StaticAtoms.py
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// whenever html5_events/html5_events.pl retrieves something new.
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@ -44,55 +52,103 @@
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for (let et of eventTypes) document.addEventListener(et, eventSuppressor, true);
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ns.on("capabilities", () => {
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if (document.body && document.body._onload) {
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document.body.setAttribute("onload", document.body._onload);
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}
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let {readyState} = document;
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debug("Readystate: %s, canScript: ", readyState, ns.canScript);
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if (ns.canScript) {
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let softReload = e => {
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try {
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debug("Soft reload", e);
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removeEventListener("DOMContentLoaded", softReload, true);
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let document = window.wrappedJSObject.document;
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let html = document.documentElement.outerHTML;
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document.open();
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softReloading = false;
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document.write(html);
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document.close();
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} catch(e) {
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error(e);
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if (!ns.canScript) {
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for (let node of document.querySelectorAll("*")) {
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let evAttrs = [...node.attributes].filter(a => a.name.toLowerCase().startsWith("on"));
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for (let a of evAttrs) {
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debug("Reparsing event attribute", a, node);
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node.removeAttributeNode(a);
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node.setAttributeNodeNS(a);
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}
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}
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if (readyState === "loading") {
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debug("Deferring softReload to DOMContentLoaded...");
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addEventListener("DOMContentLoaded", softReload, true);
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} else {
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softReload();
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}
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} else {
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try {
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for (let node of document.querySelectorAll("*")) {
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let evAttrs = [...node.attributes].filter(a => a.name.toLowerCase().startsWith("on"));
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for (let a of evAttrs) {
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debug("Reparsing event attribute after CSP", a, node);
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node.removeAttributeNode(a);
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node.setAttributeNodeNS(a);
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softReloading = false;
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return;
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}
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let softReload = ev => {
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let html = document.documentElement.outerHTML;
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try {
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debug("Soft reload", ev, html);
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softReloading = false;
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try {
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let doc = window.wrappedJSObject.document;
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removeEventListener("DOMContentLoaded", softReload, true);
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doc.open();
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doc.write(html);
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doc.close();
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debug("Written", html)
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} catch (e) {
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debug("Can't use document.write(), XML document?");
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try {
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Promise.all([...document.querySelectorAll("script")].map(s => {
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let clone = document.createElement("script");
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for (let a of s.attributes) {
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clone.setAttribute(a.name, a.value);
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}
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clone.textContent = s.textContent;
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let doneEvents = ["afterscriptexecute", "load", "error"];
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return new Promise(resolve => {
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let listener = ev => {
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if (ev.target !== clone) return;
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debug("Resolving on ", ev.type, ev.target);
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resolve(ev.target);
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for (let et of doneEvents) removeEventListener(et, listener, true);
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};
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for (let et of doneEvents) {
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addEventListener(et, listener, true);
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}
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s.replaceWith(clone);
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debug("Replaced", clone);
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});
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})).then(r => {
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debug("All scripts done", r);
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document.dispatchEvent(new Event("readystatechange"));
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document.dispatchEvent(new Event("DOMContentLoaded", {
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bubbles: true,
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cancelable: true
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}));
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if (document.readyState === "complete") {
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window.dispatchEvent(new Event("load"));
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}
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});
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} catch (e) {
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error(e);
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}
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}
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softReloading = false;
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} catch (e) {
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} catch(e) {
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error(e);
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}
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};
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if (readyState === "loading") {
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debug("Deferring softReload to DOMContentLoaded...");
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addEventListener("DOMContentLoaded", softReload, true);
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} else {
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softReload();
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}
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});
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} catch (e) {
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error(e);
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}
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addEventListener("beforescriptexecute", e => {
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let scriptSuppressor = e => {
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if (!e.isTrusted) return;
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debug(e.type, e.target);
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debug(e.type, e.target, softReloading); // DEV_ONLY
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if (softReloading) {
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e.preventDefault();
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debug("Blocked early script", s);
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debug("Blocked early script", e.target);
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} else {
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removeEventListener(e.type, scriptSuppressor);
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}
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}, true);
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};
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addEventListener("beforescriptexecute", scriptSuppressor, true);
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}
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let setup = policy => {
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