kc3-lang/libxkbcommon

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  • Hash : 6fc6e64b
    Author : Pierre Le Marre
    Date : 2025-03-26T10:35:22 

    rules: Added extended wild cards <none>, <some> and <any>

Added the following wild cards to the rules file syntax, in addition
to the current `*` legacy wild card:
- `<none>`: Match *empty* value.
- `<some>`: Match *non-empty* value.
- `<any>`: Match *any* (optionally empty) value. Its behavior does not
  depend on the context, contrary to the legacy wild card `*`.

This will enable writing much simpler rules, see [!764] for an example
of tricky rules in the `xkeyboard-config` project, that would benefit
from the new wild cards.

[!764]: https://gitlab.freedesktop.org/xkeyboard-config/xkeyboard-config/-/merge_requests/764

The verbose wild cards are preferred to single characters:
- More intuitive: self-explanatory.
- Does not steal syntax from other token.
- Extensible syntax, should we need it.

A previous proposal used the characters (`!`, `+`, `?`) for their
similarity with the corresponding syntax of regular expressions
(negative assertion & quantifiers), in line with `*`. But `!` is not
that intuitive after all and conflict with its role as section header.
Furthermore, `+` is also used as a merge mode. Finally, nothing beats
whole short words for readability.

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    Git SSH git@git.kmx.io:kc3-lang/libxkbcommon.git
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    Description

    keymap handling library for toolkits and window systems
    Users
    		 thodg_m kc3_lang_org thodg_w www_kmx_io thodg thodg_l
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  • README.md

  • libxkbcommon

    libxkbcommon is a keyboard keymap compiler and support library which processes a reduced subset of keymaps as defined by the XKB (X Keyboard Extension) specification. It also contains a module for handling Compose and dead keys and a separate registry library for listing available keyboard layouts.

    Quick Guide

    Building

    libxkbcommon is built with Meson:

    meson setup build
meson compile -C build
meson test -C build # Run the tests.

    To build for use with Wayland, you can disable X11 support while still using the X11 keyboard configuration resource files thusly:

    meson setup build \
    -Denable-x11=false \
    -Dxkb-config-root=/usr/share/X11/xkb \
    -Dx-locale-root=/usr/share/X11/locale
meson compile -C build
    Complete list of user options @include meson_options.txt

    API

    While libxkbcommon’s API is somewhat derived from the classic XKB API as found in X11/extensions/XKB.h and friends, it has been substantially reworked to expose fewer internal details to clients.

    See the API Documentation.

    Dataset

    libxkbcommon does not distribute a keyboard layout dataset itself, other than for testing purposes. The most common dataset is xkeyboard-config, which is used by all current distributions for their X11 XKB data. Further information on xkeyboard-config is available at its homepage and at its repository.

    The dataset for Compose is distributed in libX11, as part of the X locale data.

    Relation to X11

    See Compatibility notes.

    Development

    An extremely rudimentary homepage can be found at

    https://xkbcommon.org

    xkbcommon is maintained in git at

    https://github.com/xkbcommon/libxkbcommon

    Patches are always welcome, and may be sent to either xorg-devel@lists.x.org or wayland-devel@lists.freedesktop.org or in a GitHub pull request.

    Bug reports (and usage questions) are also welcome, and may be filed at GitHub.

    The maintainers are:

    Credits

    Many thanks are due to Dan Nicholson for his heroic work in getting xkbcommon off the ground initially.

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