gnodet opened a new pull request, #12799:
URL: https://github.com/apache/maven/pull/12799
## Backport of #12737
Cherry-pick of #12737 onto `maven-4.0.x`.
**Original PR:** #12737 - Support the logical not operator in profile
activation conditions
**Original author:** @SEPURI-SAI-KRISHNA
**Target branch:** `maven-4.0.x`
### Original description
Adds handling for the `!` operator to `ConditionParser.parseUnary()`.
The tokenizer already treats `!` as an operator and emits a bare `!` token,
but no parser rule
consumed it. Writing the natural form of a negated condition
(`!exists('some/path')`) failed
with `Unknown variable: !`.
`!` is defined as sugar for the `not()` function that already exists, using
the same
`toBoolean()` coercion. It is handled in `parseUnary()`, giving it the same
precedence as
in Java: tighter than arithmetic, comparison, `&&` and `||`.
`!=` is unaffected -- the tokenizer emits it as a single token before a bare
`!` can be produced.
Fixes #12736
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