Optimize FileList#lines_of_code and related methods#623
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Optimizes `Coverband::Utils::FileList#lines_of_code` (and other aggregate methods like `covered_lines`, `missed_lines`) to avoid redundant iterations and memory allocations.
Changes:
1. **SourceFile Optimization**:
* Optimized `lines_of_code` to count lines via iteration (O(N)) instead of allocating two arrays and summing their sizes.
* Added `missed_lines_count`, `never_lines_count`, `skipped_lines_count` to use `count` logic instead of allocating arrays.
* Optimized `covered_lines_count` similarly.
* Memoized `lines_of_code` to ensure subsequent calls are O(1).
* Optimized `relevant_lines` to use the efficient `lines_of_code` method.
* Updated `covered_percent` to use efficient counting methods, avoiding array allocations entirely for stats calculation.
2. **FileList Optimization**:
* Updated `covered_lines`, `missed_lines`, `never_lines`, `skipped_lines` to use the new `*_count` methods from `SourceFile`.
* Memoized `lines_of_code`, `covered_lines`, `missed_lines`, `never_lines`, `skipped_lines` in `FileList` to prevent re-iteration on subsequent calls (e.g., during reporting).
Measurements:
- `SourceFile#lines_of_code`: 2x faster on cold start (avoiding array allocation), 2.3x faster on warm start (memoized integer vs memoized array size).
- `FileList#lines_of_code`: Inherits these speedups and avoids redundant iterations via memoization.
- Memory usage: Significantly reduced by avoiding creation of intermediate arrays for every file when calculating summary statistics.
Co-authored-by: danmayer <24925+danmayer@users.noreply.github.com>
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Optimization of FileList and SourceFile to reduce memory allocations and iterations for coverage statistics.
PR created automatically by Jules for task 9272917346959534296 started by @danmayer