From 4492b5f8e774bf3b4f21e4e468fc052cbcbb468a Mon Sep 17 00:00:00 2001
From: Thomas Groman <tgroman@nuegia.net>
Date: Mon, 16 Dec 2019 19:48:42 -0800
Subject: initial commit

---
 modules/CharsetMenu.jsm | 160 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 160 insertions(+)
 create mode 100644 modules/CharsetMenu.jsm

(limited to 'modules/CharsetMenu.jsm')

diff --git a/modules/CharsetMenu.jsm b/modules/CharsetMenu.jsm
new file mode 100644
index 0000000..f973088
--- /dev/null
+++ b/modules/CharsetMenu.jsm
@@ -0,0 +1,160 @@
+/* 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/. */
+
+this.EXPORTED_SYMBOLS = [ "CharsetMenu" ];
+
+const { classes: Cc, interfaces: Ci, utils: Cu} = Components;
+
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+XPCOMUtils.defineLazyGetter(this, "gBundle", function() {
+  const kUrl = "chrome://browser/locale/charsetMenu.properties";
+  return Services.strings.createBundle(kUrl);
+});
+/**
+ * This set contains encodings that are in the Encoding Standard, except:
+ *  - XSS-dangerous encodings (except ISO-2022-JP which is assumed to be
+ *    too common not to be included).
+ *  - x-user-defined, which practically never makes sense as an end-user-chosen
+ *    override.
+ *  - Encodings that IE11 doesn't have in its correspoding menu.
+ */
+const kEncodings = new Set([
+  // Globally relevant
+  "UTF-8",
+  "windows-1252",
+  // Arabic
+  "windows-1256",
+  "ISO-8859-6",
+  // Baltic
+  "windows-1257",
+  "ISO-8859-4",
+  // "ISO-8859-13", // Hidden since not in menu in IE11
+  // Central European
+  "windows-1250",
+  "ISO-8859-2",
+  // Chinese, Simplified
+  "gbk",
+  "gb18030",
+  // Chinese, Traditional
+  "Big5",
+  // Cyrillic
+  "windows-1251",
+  "ISO-8859-5",
+  "KOI8-R",
+  "KOI8-U",
+  "IBM866", // Not in menu in Chromium. Maybe drop this?
+  // "x-mac-cyrillic", // Not in menu in IE11 or Chromium.
+  // Greek
+  "windows-1253",
+  "ISO-8859-7",
+  // Hebrew
+  "windows-1255",
+  "ISO-8859-8-I",
+  "ISO-8859-8",
+  // Japanese
+  "Shift_JIS",
+  "EUC-JP",
+  "ISO-2022-JP",
+  // Korean
+  "EUC-KR",
+  // Thai
+  "windows-874",
+  // Turkish
+  "windows-1254",
+  // Vietnamese
+  "windows-1258",
+  // Hiding rare European encodings that aren't in the menu in IE11 and would
+  // make the menu messy by sorting all over the place
+  // "ISO-8859-3",
+  // "ISO-8859-10",
+  // "ISO-8859-14",
+  // "ISO-8859-15",
+  // "ISO-8859-16",
+  // "macintosh"
+]);
+
+// Always at the start of the menu, in this order, followed by a separator.
+const kPinned = [
+  "UTF-8",
+  "windows-1252"
+];
+
+this.CharsetMenu = Object.freeze({
+  build: function BuildCharsetMenu(event) {
+    let parent = event.target;
+    if (parent.lastChild.localName != "menuseparator") {
+      // Detector menu or charset menu already built
+      return;
+    }
+    let doc = parent.ownerDocument;
+
+    function createItem(encoding) {
+      let menuItem = doc.createElement("menuitem");
+      menuItem.setAttribute("type", "radio");
+      menuItem.setAttribute("name", "charsetGroup");
+      try {
+        menuItem.setAttribute("label", gBundle.GetStringFromName(encoding));
+      } catch (e) {
+        // Localization error but put *something* in the menu to recover.
+        menuItem.setAttribute("label", encoding);
+      }
+      try {
+        menuItem.setAttribute("accesskey",
+                              gBundle.GetStringFromName(encoding + ".key"));
+      } catch (e) {
+        // Some items intentionally don't have an accesskey
+      }
+      menuItem.setAttribute("id", "charset." + encoding);
+      return menuItem;
+    }
+
+    // Clone the set in order to be able to remove the pinned encodings from
+    // the cloned set.
+    let encodings = new Set(kEncodings);
+    for (let encoding of kPinned) {
+      encodings.delete(encoding);
+      parent.appendChild(createItem(encoding));
+    }
+    parent.appendChild(doc.createElement("menuseparator"));
+    let list = [];
+    for (let encoding of encodings) {
+      list.push(createItem(encoding));
+    }
+
+    list.sort(function (a, b) {
+      let titleA = a.getAttribute("label");
+      let titleB = b.getAttribute("label");
+      // Normal sorting sorts the part in parenthesis in an order that
+      // happens to make the less frequently-used items first.
+      let index;
+      if ((index = titleA.indexOf("(")) > -1) {
+        titleA = titleA.substring(0, index);
+      }
+      if ((index = titleB.indexOf("(")) > -1) {
+        titleA = titleB.substring(0, index);
+      }
+      let comp = titleA.localeCompare(titleB);
+      if (comp) {
+        return comp;
+      }
+      // secondarily reverse sort by encoding name to sort "windows" or
+      // "shift_jis" first. This works regardless of localization, because
+      // the ids aren't localized.
+      let idA = a.getAttribute("id");
+      let idB = b.getAttribute("id");
+      if (idA < idB) {
+        return 1;
+      }
+      if (idB < idA) {
+        return -1;
+      }
+      return 0;
+    });
+
+    for (let item of list) {
+      parent.appendChild(item);
+    }
+  },
+});
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