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// Copyright 2017 Ulrik de Muelenaere <ulrikdem@gmail.com>
// Copyright 2017-2021 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
//
// SPDX-License-Identifier: GPL-3.0-or-later
"use strict";
window._qutebrowser.stylesheet = (function() {
if (window._qutebrowser.stylesheet) {
return window._qutebrowser.stylesheet;
}
const funcs = {};
const xhtml_ns = "http://www.w3.org/1999/xhtml";
const svg_ns = "http://www.w3.org/2000/svg";
let root_elem;
let style_elem;
let css_content = "";
let root_observer;
let initialized = false;
// Watch for rewrites of the root element and changes to its children,
// then move the stylesheet to the end. Partially inspired by Stylus:
// https://github.com/openstyles/stylus/blob/1.1.4.2/content/apply.js#L235-L355
function watch_root() {
if (!document.documentElement) {
root_observer.observe(document, {"childList": true});
return;
}
if (root_elem !== document.documentElement) {
root_elem = document.documentElement;
root_observer.disconnect();
root_observer.observe(document, {"childList": true});
root_observer.observe(root_elem, {"childList": true});
}
if (style_elem !== root_elem.lastChild) {
root_elem.appendChild(style_elem);
}
}
function create_style() {
let ns = xhtml_ns;
if (document.documentElement &&
document.documentElement.namespaceURI === svg_ns) {
ns = svg_ns;
}
style_elem = document.createElementNS(ns, "style");
style_elem.textContent = css_content;
root_observer = new MutationObserver(watch_root);
watch_root();
}
// We should only inject the stylesheet if the document already has style
// information associated with it. Otherwise we wait until the browser
// rewrites it to an XHTML document showing the document tree. As a
// starting point for exploring the relevant code in Chromium, see
// https://github.com/qt/qtwebengine-chromium/blob/cfe8c60/chromium/third_party/WebKit/Source/core/xml/parser/XMLDocumentParser.cpp#L1539-L1540
function check_style(node) {
const stylesheet = node.nodeType === Node.PROCESSING_INSTRUCTION_NODE &&
node.target === "xml-stylesheet" &&
node.parentNode === document;
const known_ns = node.nodeType === Node.ELEMENT_NODE &&
(node.namespaceURI === xhtml_ns ||
node.namespaceURI === svg_ns);
return stylesheet || known_ns;
}
function init() {
initialized = true;
// Chromium will not rewrite a document inside a frame, so add the
// stylesheet even if the document is unstyled.
if (window !== window.top) {
create_style();
return;
}
const iter = document.createNodeIterator(document,
NodeFilter.SHOW_PROCESSING_INSTRUCTION | NodeFilter.SHOW_ELEMENT);
let node;
while ((node = iter.nextNode())) {
if (check_style(node)) {
create_style();
return;
}
}
const style_observer = new MutationObserver((mutations) => {
for (const mutation of mutations) {
const nodes = mutation.addedNodes;
for (let i = 0; i < nodes.length; ++i) {
if (check_style(nodes[i])) {
create_style();
style_observer.disconnect();
return;
}
}
}
});
style_observer.observe(document, {"childList": true, "subtree": true});
}
funcs.set_css = function(css) {
if (!initialized) {
init();
}
if (style_elem) {
style_elem.textContent = css;
// The browser seems to rewrite the document in same-origin frames
// without notifying the mutation observer. Ensure that the
// stylesheet is in the current document.
watch_root();
} else {
css_content = css;
}
// Propagate the new CSS to all child frames.
for (let i = 0; i < window.frames.length; ++i) {
const frame = window.frames[i];
try {
if (frame._qutebrowser && frame._qutebrowser.stylesheet) {
frame._qutebrowser.stylesheet.set_css(css);
}
} catch (exc) {
if (exc instanceof DOMException && exc.name === "SecurityError") {
// FIXME:qtwebengine This does not work for cross-origin frames.
console.log(`Failed to style frame: ${exc.message}`);
} else {
throw exc;
}
}
}
};
return funcs;
})();
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