kc3-lang/libxkbcommon/test/data/rules/merge-mode-replace

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• Hash : 23598fa1
  Author :
  Date : 2025-03-25T22:52:06
  

  Enable merge mode “replace” in include statements
  
  Previously only the merge modes “override” and “augment” were available
  in include statements, using the prefix ‘+’ and ‘|’ respectively. While
  on one hand `replace` include statement can be used in keymap files, on
  the other hand *rules* files have no way to express the *replace* mode.
  
  This commit enables the merge mode “replace” using the prefix `^`. This
  prefix was chosen due to its similarity with the `XOR` bit operator,
  which convey *mutual exclusion*.
  
  Other candidates:
  - `!` conveys some kind of higher precedence, akin to CSS `!important`.
    But it conflicts with the section header `!`, which is a token in the
    current parser. It would require special handling, not worth it. It
    also convey the meaning of negation, which is confusing.
  - `&` has the advantage of not corresponding to a token in the rules
    parser. `^` seems however to stand out more and it is less likely to
    trigger erroneous comparison with `|` and `&` bit operators.
  

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• test/data/rules/merge-mode-replace

• ! model         = keycodes
    *             = evdev
  
  
  ! model         = types
    *             = complete
  
  ! model         = compat
    *             = complete
  
  ! layout        = symbols
    *             = pc+%l
  
  ! layout[1]     = symbols
    *             = pc+%l[1]
  
  ! layout[2]     = symbols
    *             = +%l[2]:2
  
  ! option        = symbols
  replace:single  = ^level3(ralt_alt)
  replace:first   = ^level3(ralt_alt)|empty
  replace:later   = +level3(ralt_switch)^level3(ralt_alt)|empty
  grp:menu_toggle	= +group(menu_toggle)
  

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