[TheWillard]

Text configs treated every line starting with # as a comment: macros were left unexpanded (and failed to parse), #include was silently dropped. This adds the preprocessor, following PreProcessor Commands:

• #define with arguments, variadic macros (__VA_ARGS__, __VA_OPT__, __VA_OPT_INV__, __VA_APPLY__, __VA_SELECT__), # and ##, multi-line bodies. #undef.
• #if (comparisons, plus &&, ||, !, defined()), #ifdef, #ifndef, #else, #endif, also #elif. Nesting works.
• #include "..." / <...>, relative and \ absolute paths, ... Nesting is limited to 32 levels, which also stops include cycles.
• __has_include, __LINE__, __FILE__, __FILE_NAME__, __FILE_SHORT__, __COUNTER__, __COUNTER_RESET__, the date/time macros (UTC), __RAND_*. __ARMA__ and __ARMA3__ are predefined; game-dependent ones (__GAME_VER_MAJ__, __A3_DEBUG__, ...) can be set with Preprocessor::define.

Where the game differs from C, it follows the game:

• Arguments are expanded before they're substituted, also for # and ##: QUOTE(GVAR(x)) gives "cba_main_x".
• Arguments aren't trimmed (matches the wiki's FORMAT example output).
• ## only removes itself, the whitespace around it stays: ACE's class ##weapon gives class weapon.
• Single-quoted strings are expanded, double-quoted ones aren't. A # in a body that isn't followed by an argument is dropped.

Not copied: the game drops commas inside quoted macro arguments (MACRO("a, b") → "a b"), this keeps them.

API:

• Preprocessor::new().with_resolver(...), define, undefine, preprocess(src, path), preprocess_path(path).
• IncludeResolver: FsIncludeResolver for files on disk (include dirs like a P drive), or any closure Fn(&str, Option<&str>) -> io::Result<Option<IncludeFile>>; join_include_path resolves virtual paths for closures serving PBO contents.
• Cfg::parse_config_with(src, path, &mut pp) and Cfg::parse_path(path, &mut pp).
• Behavior change: Cfg::parse_config and Cfg::read now preprocess first. #include without a resolver is a PreprocessError instead of being skipped.

Checked against all 220 config.cpp of CBA_A3 and ACE3 (with \a3\ui_f includes stubbed as empty): all preprocess, in 1.8 s total, with no unexpanded macros left. 121 parse; the other 99 fail in the config parser on +=, arithmetic, numbers with leading zeros, hex numbers and class names starting with a digit, which comes next.

[codecov]

Codecov Report

❌ Patch coverage is 99.16981% with 11 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...le-formats/src/real_virtuality/rap/preprocessor.rs	99.15%	11 Missing ⚠️

Files with missing lines	Coverage Δ
...rma-file-formats/src/real_virtuality/rap/config.rs	85.41% <100.00%> (+1.88%)	⬆️
arma-file-formats/src/real_virtuality/rap/mod.rs	60.00% <ø> (+14.00%)	⬆️
...le-formats/src/real_virtuality/rap/preprocessor.rs	99.15% <99.15%> (ø)

... and 2 files with indirect coverage changes

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