libexpr: diagnostics framework & error recovery basics#9119
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inclyc wants to merge 3 commits intoNixOS:masterfrom
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libexpr: diagnostics framework & error recovery basics#9119inclyc wants to merge 3 commits intoNixOS:masterfrom
inclyc wants to merge 3 commits intoNixOS:masterfrom
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This is an NFC PR that splits epilogue & prologue from parser. As mentioned in NixOS#8812, we can add static checking tools & auto formatting for these files, but if it is written .y directly, the clang parser cannot understand the code is actually "C++".
This PR contains no functioanl change, there are bunch of suggesstions by clang-tidy in the file and there are fixes available. Including: - 0 -> nullptr - use `auto` for iterator types - sort `#include`s - closing namespace comment - use `.empty()` instead of comparing it with empty object - use `auto` if it the type is apparently specified (e.g. `new Type`) - add const specifier or `&` to improve readability
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Motivation
This is an initial support for warning & diagnostics (it is really large so I pushed it here for review). We talked about Nix language versioning in NixOS/rfcs#137 , and this PR brings some deprecate warnings for nix parser.
Previously we are just throwing exceptions, but it may not work for encountered some syntax we want to give a "warning" to the user, so I deferred the throwing after parsing.
Context
Depends-on: #9089
Partially-addresses: #8584
Impl strategy
Adding a macro-based framework that allow many kinds of diagnostic definition & formatting
Priorities
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