From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 02:47:55 +0200
Subject: Adding upstream version 124.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../storybook/.storybook/chrome-styles-loader.js   | 145 +++++++++++++++++++++
 1 file changed, 145 insertions(+)
 create mode 100644 browser/components/storybook/.storybook/chrome-styles-loader.js

(limited to 'browser/components/storybook/.storybook/chrome-styles-loader.js')

diff --git a/browser/components/storybook/.storybook/chrome-styles-loader.js b/browser/components/storybook/.storybook/chrome-styles-loader.js
new file mode 100644
index 0000000000..4a66128320
--- /dev/null
+++ b/browser/components/storybook/.storybook/chrome-styles-loader.js
@@ -0,0 +1,145 @@
+/* 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/. */
+/* eslint-env node */
+
+/**
+ * This file contains a webpack loader which rewrites JS source files to use CSS
+ * imports when running in Storybook. This allows JS files loaded in Storybook to use
+ * chrome:// URIs when loading external stylesheets without having to worry
+ * about Storybook being able to find and detect changes to the files.
+ *
+ * This loader allows Lit-based custom element code like this to work with
+ * Storybook:
+ *
+ *    render() {
+ *      return html`
+ *        <link rel="stylesheet" href="chrome://global/content/elements/moz-toggle.css" />
+ *        ...
+ *      `;
+ *    }
+ *
+ * By rewriting the source to this:
+ *
+ *    import moztoggleStyles from "toolkit/content/widgets/moz-toggle/moz-toggle.css";
+ *    ...
+ *    render() {
+ *      return html`
+ *        <link rel="stylesheet" href=${moztoggleStyles} />
+ *        ...
+ *      `;
+ *    }
+ *
+ * It works similarly for vanilla JS custom elements that utilize template
+ * strings. The following code:
+ *
+ *    static get markup() {
+ *      return`
+ *        <template>
+ *          <link rel="stylesheet" href="chrome://browser/skin/migration/migration-wizard.css">
+ *          ...
+ *        </template>
+ *      `;
+ *    }
+ *
+ * Gets rewritten to:
+ *
+ *    import migrationwizardStyles from "browser/themes/shared/migration/migration-wizard.css";
+ *    ...
+ *    static get markup() {
+ *      return`
+ *        <template>
+ *          <link rel="stylesheet" href=${migrationwizardStyles}>
+ *          ...
+ *        </template>
+ *      `;
+ *    }
+ */
+
+const path = require("path");
+const projectRoot = path.join(process.cwd(), "../../..");
+const rewriteChromeUri = require("./chrome-uri-utils.js");
+
+/**
+ * Return an array of the unique chrome:// CSS URIs referenced in this file.
+ *
+ * @param {string} source - The source file to scan.
+ * @returns {string[]} Unique list of chrome:// CSS URIs
+ */
+function getReferencedChromeUris(source) {
+  const chromeRegex = /chrome:\/\/.*?\.css/g;
+  const matches = new Set();
+  for (let match of source.matchAll(chromeRegex)) {
+    // Add the full URI to the set of matches.
+    matches.add(match[0]);
+  }
+  return [...matches];
+}
+
+/**
+ * Replace references to chrome:// URIs with the relative path on disk from the
+ * project root.
+ *
+ * @this {WebpackLoader} https://webpack.js.org/api/loaders/
+ * @param {string} source - The source file to update.
+ * @returns {string} The updated source.
+ */
+async function rewriteChromeUris(source) {
+  const chromeUriToLocalPath = new Map();
+  // We're going to rewrite the chrome:// URIs, find all referenced URIs.
+  let chromeDependencies = getReferencedChromeUris(source);
+  for (let chromeUri of chromeDependencies) {
+    let localRelativePath = rewriteChromeUri(chromeUri);
+    if (localRelativePath) {
+      localRelativePath = localRelativePath.replaceAll("\\", "/");
+      // Store the mapping to a local path for this chrome URI.
+      chromeUriToLocalPath.set(chromeUri, localRelativePath);
+      // Tell webpack the file being handled depends on the referenced file.
+      this.addMissingDependency(path.join(projectRoot, localRelativePath));
+    }
+  }
+  // Rewrite the source file with mapped chrome:// URIs.
+  let rewrittenSource = source;
+  for (let [chromeUri, localPath] of chromeUriToLocalPath.entries()) {
+    // Generate an import friendly variable name for the default export from
+    // the CSS file e.g. __chrome_styles_loader__moztoggleStyles.
+    let cssImport = `__chrome_styles_loader__${path
+      .basename(localPath, ".css")
+      .replaceAll("-", "")}Styles`;
+
+    // MozTextLabel is a special case for now since we don't use a template.
+    if (
+      this.resourcePath.endsWith("/moz-label.mjs") ||
+      this.resourcePath.endsWith(".js")
+    ) {
+      rewrittenSource = rewrittenSource.replaceAll(`"${chromeUri}"`, cssImport);
+    } else {
+      rewrittenSource = rewrittenSource.replaceAll(
+        chromeUri,
+        `\$\{${cssImport}\}`
+      );
+    }
+
+    // Add a CSS import statement as the first line in the file.
+    rewrittenSource =
+      `import ${cssImport} from "${localPath}";\n` + rewrittenSource;
+  }
+  return rewrittenSource;
+}
+
+/**
+ * The WebpackLoader export. Runs async since apparently that's preferred.
+ *
+ * @param {string} source - The source to rewrite.
+ * @param {Map} sourceMap - Source map data, unused.
+ * @param {Object} meta - Metadata, unused.
+ */
+module.exports = async function chromeUriLoader(source) {
+  // Get a callback to tell webpack when we're done.
+  const callback = this.async();
+  // Rewrite the source async since that appears to be preferred (and will be
+  // necessary once we support rewriting CSS/SVG/etc).
+  const newSource = await rewriteChromeUris.call(this, source);
+  // Give webpack the rewritten content.
+  callback(null, newSource);
+};
-- 
cgit v1.2.3