lix/tests/unit
eldritch horrors 08252967a8 libexpr: Support structured error classes
While preparing PRs like #9753, I've had to change error messages in
dozens of code paths. It would be nice if instead of

    EvalError("expected 'boolean' but found '%1%'", showType(v))

we could write

    TypeError(v, "boolean")

or similar. Then, changing the error message could be a mechanical
refactor with the compiler pointing out places the constructor needs to
be changed, rather than the error-prone process of grepping through the
codebase. Structured errors would also help prevent the "same" error
from having multiple slightly different messages, and could be a first
step towards error codes / an error index.

This PR reworks the exception infrastructure in `libexpr` to
support exception types with different constructor signatures than
`BaseError`. Actually refactoring the exceptions to use structured data
will come in a future PR (this one is big enough already, as it has to
touch every exception in `libexpr`).

The core design is in `eval-error.hh`. Generally, errors like this:

    state.error("'%s' is not a string", getAttrPathStr())
      .debugThrow<TypeError>()

are transformed like this:

    state.error<TypeError>("'%s' is not a string", getAttrPathStr())
      .debugThrow()

The type annotation has moved from `ErrorBuilder::debugThrow` to
`EvalState::error`.

(cherry picked from commit c6a89c1a1659b31694c0fbcd21d78a6dd521c732)
Change-Id: Iced91ba4e00ca9e801518071fb43798936cbd05a
2024-03-09 04:47:05 -07:00
..
libexpr libexpr: Support structured error classes 2024-03-09 04:47:05 -07:00
libexpr-support Add missing -pthread for test support libraries 2023-12-05 23:44:41 +00:00
libstore Merge pull request #9560 from obsidiansystems/serve-proto-unkeyed-valid-path-info-serializer 2024-03-07 12:37:33 +01:00
libstore-support Merge pull request #10074 from lf-/jade/ban-implicit-fallthrough 2024-03-07 00:11:12 -07:00
libutil fix: nlohmann::adl_serializer for std::optional (#9147) 2024-03-04 07:11:25 +01:00
libutil-support Add missing -pthread for test support libraries 2023-12-05 23:44:41 +00:00