Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 199 insertions, 0 deletions

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+======================================
+Managing the built-in en-US dictionary
+======================================
+
+The en-US build of Firefox includes a built-in Hunspell dictionary based on the
+`SCOWL`_ dataset. This document describes the process to add new words to the
+dictionary, or update it to the current upstream version.
+
+For more information about Hunspell or the affix file format, you can check
+`the Ubuntu man page for hunspell
+<https://manpages.ubuntu.com/manpages/bionic/man5/hunspell.5.html>`_.
+
+Requesting to add new words to the en-US dictionary
+===================================================
+
+If you’d like to add new words to the dictionary, you can add your request to
+`this bug <https://bugzilla.mozilla.org/show_bug.cgi?id=enus-dictionary>`_:
+
+* Include all possible forms, e.g. plural and genitive forms for nouns,
+  different tenses for verbs.
+* Try to provide information on the terms you want to add, in particular
+  references to external sources that confirm the usage of the term (e.g.
+  Merriam-Webster or Oxford online dictionaries).
+
+.. note::
+
+  If you’re fixing the existing bug with pending requests, make sure to `file a
+  new bug`_ and move the alias ``enus-dictionary`` (in the *Details* section)
+  from the old bug to the new one.
+
+Adding new words to the en-US dictionary
+========================================
+
+This section describes the process for adding new words to the dictionary:
+
+#. Get a clone of mozilla-central (see :ref:`Firefox Contributors' Quick
+   Reference`), if you don’t already have one, and make sure you can build it
+   successfully.
+#. Move in the dictionary sources directory using this command:
+   ``cd extensions/spellcheck/locales/en-US/hunspell/dictionary-sources``.
+#. Identify the current version of SCOWL by checking the file
+   ``README_en_US.txt`` (at the beginning of the file there is a line similar to
+   ``Generated from SCOWL Version 2020.12.07``, where ``2020.12.07`` is the
+   SCOWL version).
+#. Download the same version of the dictionary from the `SCOWL`_ homepage or
+   `SourceForce`_ as a tarball (tag.gz) and unpack it in the working directory.
+   Rename the resulting folder from ``scowl-YYYY.MM.DD`` to ``scowl``.
+#. There’s a special script used for editing dictionaries. The script
+   only works if you have the environment variable ``EDITOR`` set to the
+   executable of an editor program; if you don’t have it set, you can use
+   ``EDITOR=vim sh edit-dictionary.sh`` to edit using ``vim`` (or you can
+   substitute it with another editor), or you can just type
+   ``sh edit-dictionary.sh`` if you have an ``EDITOR`` already specified.
+
+   Copy and paste the full list of words, then save and quit the editor. It’s
+   not necessary to put the words in alphabetical order, as it will be corrected
+   by the script.
+#. Run the script ``sh make-new-dict.sh`` to generate a new dictionary and make
+   sure it runs without errors. For more details on this script, see the
+   `make-new-dict.sh`_ section.
+#. Do a sanity check on the resulting dictionary file ``en_US-mozilla.dic``. For
+   example, make sure that the size is about the same as the original dictionary
+   (or slightly larger).
+#. If everything looks correct, use ``sh install-new-dict.sh`` to copy the
+   generated file in the right position.
+#. Build Firefox and test your updated dictionary. Once you’re
+   satisfied, use the process described in :ref:`write_a_patch` to create a
+   patch.
+
+Note that the update script will modify 2 versions of the dictionary, and both
+need to be committed:
+
+* ``en-US.dic``: the dictionary actually shipping in the build, it uses
+  ISO-8859-1 encoding.
+* ``utf8/en-US.dic``: a version of the same dictionary with UTF-8 encoding. This
+  is used to work around issues with Phabricator, and it allows to display
+  actual changes in the diff.
+
+Exclude words from suggestions
+==============================
+
+It’s possible to completely exclude words from suggested alternatives by adding
+an affix rule ``!`` at the end of the definition in the ``.dic`` file. For
+example:
+
+* ``bum`` would be changed to ``bum/!`` (note the additional forward slash).
+* ``bum/MS`` would be changed to ``bum/MS!``.
+
+In order to exclude a word from suggestions, follow the instructions available
+in `Adding new words to the en-US dictionary`_. Instead of running the
+``edit-dictionary.sh`` script (point 5), use a text editor to edit the file
+``en-US.dic`` directly, then proceed with the remaining instructions.
+
+.. warning::
+
+  Make sure to open ``en-US.dic`` with the correct encoding. For example, Visual
+  Studio Code will try to open it as ``UTF-8``, and it needs to be reopened with
+  encoding ``Western (ISO 8859-1)``.
+
+Upgrading dictionary to a new upstream version of SCOWL
+=======================================================
+
+The English dictionary available in mozilla-central is based on the
+`SCOWL`_ dictionary. Some scripts distributed with the SCOWL package are
+used to generate the files for the en-US dictionary.
+
+The working directory for this process is
+``extensions/spellcheck/locales/en-US/hunspell/dictionary-sources``.
+
+#. Download the latest version of the dictionary from the `SCOWL`_ homepage or
+   `SourceForce`_ as a tarball (tag.gz) and unpack it in the working directory.
+   Rename the resulting folder from ``scowl-YYYY.MM.DD`` to ``scowl``.
+#. Run the script ``sh make-new-dict.sh`` to generate a new dictionary and make
+   sure it runs without errors. For more details on this script, see the
+   `make-new-dict.sh`_ section.
+#. Do a sanity check on the resulting dictionary file ``en_US-mozilla.dic``. For
+   example, make sure that the size is about the same as the original dictionary
+   (or slightly larger).
+#. If everything looks correct, use ``sh install-new-dict.sh`` to copy the
+   generated file in the right position and use the process described in
+   :ref:`write_a_patch` to create a patch.
+
+Info about the file structure
+=============================
+
+mozilla-specific.txt
+--------------------
+
+This file contains Mozilla-specific words that should not be submitted
+upstream. For example, ``Firefox`` should go in this file (see `bug 237921`_).
+
+Note that the file ``5-mozilla-specific.txt`` is generated by expanding
+``mozilla-specific.txt`` and should not be edited directly.
+
+utf8 folder
+-----------
+
+``dictionary-sources/utf8`` is used to store a copy with UTF-8 encoding of the
+dictionary files. This is used to work around limitations in Phabricator, which
+treats ISO-8859-1 files as binary and won’t display a diff when updating them.
+
+Info about the included scripts
+===============================
+
+make-new-dict.sh
+----------------
+
+The dictionary upgrade scripts ``make-new-dict.sh`` works by expanding (i.e.
+“unmunching”) the affix compression dictionaries to create wordlists and
+use those to generate a new dictionary.
+
+The upgrade script expects the current upstream version to be kept in the
+directory ``orig``.
+
+The script will create a few files in ``dictionary-sources/support_file`` in the
+following order:
+
+* ``0-special.txt`` contains numbers and ordinals expanded from SCOWL
+  ``en.dic.supp``.
+* ``1-base.txt`` contains words expanded from ``en_US-custom.dic`` in the
+  **previous** version of SCOWL (from the ``orig`` folder).
+* ``2-mozilla.txt`` contains words expanded from the current Mozilla dictionary.
+* ``3-upstream.txt`` contains words expanded from ``en_US-custom.dic`` in the
+  **new** version of SCOWL (from the ``scowl/speller`` folder).
+* ``2-mozilla-removed.txt`` contains words that are only available in the SCOWL
+  dictionary, i.e. removed by Mozilla.
+* ``2-mozilla-added.txt`` contains words that are only available in the current
+  Mozilla dictionary, i.e. added by Mozilla.
+* ``4-patched.txt`` contains words from the new SCOWL dictionary
+  (``3-upstream.txt``), with words from (``2-mozilla-removed.txt``) removed and
+  words (``2-mozilla-added.txt``) added.
+* ``5-mozilla-specific.txt`` is expanded from ``mozilla-specific.txt`` using the
+  current affix rules from the Mozilla dictionary.
+* ``5-mozilla-removed.txt`` and ``5-mozilla-added.txt`` contain words that are
+  respectively removed and added by Mozilla compared to the **new** SCOWL
+  version. These files could be used to submit upstream changes, but words
+  included in ``5-mozilla-specific.txt`` should be removed from this list.
+
+The new dictionary is available as ``en_US-mozilla.dic`` and should be copied
+over using the ``install-new-dict.sh`` script.
+
+install-new-dict.sh
+-------------------
+
+The script:
+
+* Creates a copy of ``orig`` as ``support_files/orig-bk`` and copies the new
+  upstream version to ``orig``.
+* Copies the existing Mozilla dictionary in ``support_files/mozilla-bk``.
+* Converts the dictionary (.dic) generated by ``make-new-dict.sh`` from UTF-8 to
+  ISO-8859-1 and moves it to the parent folder.
+* Sets the affix file (.aff) to use ``ISO8859-1`` as ``SET`` instead of the
+  original ``UTF-8``, removes ``ICONV`` patterns (input conversion tables).
+
+
+.. _SCOWL: http://wordlist.aspell.net
+.. _file a new bug: https://bugzilla.mozilla.org/show_bug.cgi?id=enus-dictionary
+.. _SourceForce: https://sourceforge.net/projects/wordlist/files/SCOWL/
+.. _bug 237921: https://bugzilla.mozilla.org/show_bug.cgi?id=237921