Arborist v0.1.0

Arborist v0.1.0

Multi-language code complexity metrics powered by tree-sitter.

Computes cognitive complexity (SonarSource), cyclomatic complexity (McCabe), and source lines of code (SLOC) for functions and methods — all from a single, embeddable Rust library.

Supported Languages (12)

Tier	Languages	Feature flags
Tier 1 (default: ★)	Rust★, Python★, JavaScript★, TypeScript★, Java★, Go★, C#, C++, C, PHP	default = 6 most popular
Tier 2	Kotlin, Swift	kotlin, swift

features = ["all"] enables all 12 languages.

Highlights

• SonarSource-compliant cognitive complexity: nesting penalties, boolean operator sequences, flat else-if, lambda nesting, recursive call detection
• McCabe cyclomatic complexity: per-arm counting for match/switch constructs
• Feature-gated compilation: only compile the grammars you need
• JSON serialization: FileReport and FunctionMetrics implement Serialize/Deserialize
• Configurable thresholds: flag functions exceeding a cognitive complexity limit
• 177 tests across all languages, clippy clean

Installation

[dependencies]
arborist = "0.1"                    # default: Rust, Python, JS, TS, Java, Go
arborist = { version = "0.1", features = ["all"] }  # all 12 languages

Quick Example

use arborist::{analyze_file, FileReport};

let report: FileReport = analyze_file("src/main.rs")?;
for func in &report.functions {
    println!("{}: cognitive={}, cyclomatic={}, sloc={}",
        func.name, func.cognitive, func.cyclomatic, func.sloc);
}

Known Limitations

• Recursion detection is not supported for Kotlin and Swift (their tree-sitter grammars lack a named field on call expression nodes)
• Halstead metrics are planned for v0.2.0

Full Changelog

https://github.com/StrangeDaysTech/arborist/commits/v0.1.0