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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const { Services } = require("resource://gre/modules/Services.jsm");
const { getTheme } = require("devtools/client/shared/theme");
function iterStyleNodes(window, func) {
for (let node of window.document.childNodes) {
// Look for ProcessingInstruction nodes.
if (node.nodeType === 7) {
func(node);
}
}
const links = window.document.getElementsByTagNameNS(
"http://www.w3.org/1999/xhtml", "link"
);
for (let node of links) {
func(node);
}
}
function replaceCSS(window, fileURI) {
const document = window.document;
const randomKey = Math.random();
Services.obs.notifyObservers(null, "startupcache-invalidate", null);
// Scan every CSS tag and reload ones that match the file we are
// looking for.
iterStyleNodes(window, node => {
if (node.nodeType === 7) {
// xml-stylesheet declaration
if (node.data.includes(fileURI)) {
const newNode = window.document.createProcessingInstruction(
"xml-stylesheet",
`href="${fileURI}?s=${randomKey}" type="text/css"`
);
document.insertBefore(newNode, node);
document.removeChild(node);
}
} else if (node.href.includes(fileURI)) {
const parentNode = node.parentNode;
const newNode = window.document.createElementNS(
"http://www.w3.org/1999/xhtml",
"link"
);
newNode.rel = "stylesheet";
newNode.type = "text/css";
newNode.href = fileURI + "?s=" + randomKey;
parentNode.insertBefore(newNode, node);
parentNode.removeChild(node);
}
});
}
function _replaceResourceInSheet(sheet, filename, randomKey) {
for (let i = 0; i < sheet.cssRules.length; i++) {
const rule = sheet.cssRules[i];
if (rule.type === rule.IMPORT_RULE) {
_replaceResourceInSheet(rule.styleSheet, filename);
} else if (rule.cssText.includes(filename)) {
// Strip off any existing query strings. This might lose
// updates for files if there are multiple resources
// referenced in the same rule, but the chances of someone hot
// reloading multiple resources in the same rule is very low.
const text = rule.cssText.replace(/\?s=0.\d+/g, "");
const newRule = (
text.replace(filename, filename + "?s=" + randomKey)
);
sheet.deleteRule(i);
sheet.insertRule(newRule, i);
}
}
}
function replaceCSSResource(window, fileURI) {
const document = window.document;
const randomKey = Math.random();
// Only match the filename. False positives are much better than
// missing updates, as all that would happen is we reload more
// resources than we need. We do this because many resources only
// use relative paths.
const parts = fileURI.split("/");
const file = parts[parts.length - 1];
// Scan every single rule in the entire page for any reference to
// this resource, and re-insert the rule to force it to update.
for (let sheet of document.styleSheets) {
_replaceResourceInSheet(sheet, file, randomKey);
}
for (let node of document.querySelectorAll("img,image")) {
if (node.src.startsWith(fileURI)) {
node.src = fileURI + "?s=" + randomKey;
}
}
}
function watchCSS(window) {
if (Services.prefs.getBoolPref("devtools.loader.hotreload")) {
const watcher = require("devtools/client/shared/devtools-file-watcher");
function onFileChanged(_, relativePath) {
if (relativePath.match(/\.css$/)) {
if (relativePath.startsWith("client/themes")) {
let path = relativePath.replace(/^client\/themes\//, "");
// Special-case a few files that get imported from other CSS
// files. We just manually hot reload the parent CSS file.
if (path === "variables.css" || path === "toolbars.css" ||
path === "common.css" || path === "splitters.css") {
replaceCSS(window, "chrome://devtools/skin/" + getTheme() + "-theme.css");
} else {
replaceCSS(window, "chrome://devtools/skin/" + path);
}
return;
}
replaceCSS(
window,
"chrome://devtools/content/" + relativePath.replace(/^client\//, "")
);
replaceCSS(window, "resource://devtools/" + relativePath);
} else if (relativePath.match(/\.(svg|png)$/)) {
relativePath = relativePath.replace(/^client\/themes\//, "");
replaceCSSResource(window, "chrome://devtools/skin/" + relativePath);
}
}
watcher.on("file-changed", onFileChanged);
window.addEventListener("unload", () => {
watcher.off("file-changed", onFileChanged);
});
}
}
module.exports = { watchCSS };
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