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23598fa1
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2025-03-25T22:52:06
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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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