# Complexity Review Report

**Branch**: feat/rskim-search-foundation -> main
**Date**: 2026-05-11

## Issues in Your Changes (BLOCKING)

### HIGH

**`types.rs` exceeds file length threshold (661 lines)** - `crates/rskim-search/src/types.rs`
**Confidence**: 82%
- Problem: The file is 661 lines long, exceeding the 500-line warning threshold. However, 362 lines (55%) are tests (`#[cfg(test)]` starts at line 299). The production code portion (298 lines) is well within acceptable limits and each type/trait is clearly separated with section headers.
- Fix: This is borderline — the file length is inflated by comprehensive inline tests, not production complexity. Consider extracting the test module to a sibling file `tests.rs` if it grows further, but current state is acceptable given the clean section separation and that production logic is only ~298 lines.

## Issues in Code You Touched (Should Fix)

_No issues found._

## Pre-existing Issues (Not Blocking)

_No issues found._

## Suggestions (Lower Confidence)

- **`try_parse_nextest` function complexity** - `crates/rskim/src/cmd/test/cargo.rs:233` (Confidence: 65%) — The function remains complex (deep nesting, multiple mutable state variables, 130+ lines) after the if-let chaining refactor. While the chaining itself is an improvement, the function would benefit from being broken into smaller parse phases. This is pre-existing complexity that the edition 2024 refactor only slightly improved.

- **Repetitive test structure in `types.rs`** - `crates/rskim-search/src/types.rs:300-661` (Confidence: 62%) — Several tests follow near-identical patterns (serialization, roundtrip, roundtrip-with-null). A test helper or macro could reduce repetition, but the current explicit form provides better error messages and is reasonable for a foundation crate establishing API contracts.

## Summary

| Category | CRITICAL | HIGH | MEDIUM | LOW |
|----------|----------|------|--------|-----|
| Blocking | 0 | 1 | 0 | - |
| Should Fix | - | 0 | 0 | - |
| Pre-existing | - | - | 0 | 0 |

**Complexity Score**: 9/10
**Recommendation**: APPROVED

## Rationale

This PR introduces very low complexity. The new `rskim-search` crate is a pure types-and-traits library with:

- **No control flow complexity**: No loops, no branching logic in production code. Just struct/enum definitions, trait signatures, and a trivial `SearchField::name()` match.
- **Cyclomatic complexity**: All functions have complexity 1-2 (trivial). The `name()` method is a simple exhaustive match. The CLI stub `run()` has a single branch.
- **Nesting depth**: Maximum 1 level in production code.
- **Function lengths**: All under 15 lines.
- **Parameter counts**: All under 4.

The bulk of changes outside the new crate are mechanical: edition 2024 if-let chaining collapses nested `if let` / `if` blocks into single conditions. This uniformly **reduces** nesting depth by 1 level across ~52 call sites, which is a net complexity improvement. The refactoring is semantically equivalent and compiler-verified (edition 2024 enables the syntax; clippy enforces it).

The CLI stub (`cmd/search.rs`) is intentionally minimal — a help printer and a "not yet implemented" guard — with clean separation from the library types.
