Sekkei

This is a parser for the osu! .osu file specifications, and it intends to create an accurate and detailed structure on the likes of what osu! would standardly parse it as. Primarily, this was made to parse a .osu file into a human readable structure that can be used for akairo, osu!Katagiri's customly-made difficulty calculator.

Requirements and Prerequisites

• Rust (Nightly)

Technical Standpoint

To make things more convenient, I very easily could have just used JavaScript to parse beatmaps, and create the difficulty calculator with that. I felt JavaScript's dynamic and deterministic type system would only serve to inhibit the performance and quality of the project, and thus I went with a language to parse the .osu format in a quick and performant language that would suit our purposes of supporting any heavy-weight load.

Benchmarks

Unfortunately, the only benchmark results we hold right now is ones for ours. When we coordinate a bunch of libraries together and reasonably bench them with a base point being osu!lazer, we will only rationally be able to provide out own results, with the use of Criterion.

	osu!	sekkei
Beatmap parsing performance	1x	?
Base size	❌	3.282mb
Full hit object handling	✅	✅

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Current Results:

sekkai-parser/test unpack
                        time:   [1.4284 ms 1.4436 ms 1.4566 ms]
                        thrpt:  [638.27 KiB/s 644.00 KiB/s 650.87 KiB/s]
Found 3 outliers among 100 measurements (3.00%)
  1 (1.00%) high mild
  2 (2.00%) high severe