windjammer 0.48.0

A simple language inspired by Go, Ruby, and Elixir that transpiles to Rust - 80% of Rust's power with 20% of the complexity
Documentation 
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#![cfg(any(
    not(any(
        feature = "parser_tests",
        feature = "analyzer_tests",
        feature = "codegen_tests",
        feature = "interpreter_tests",
        feature = "conformance_tests",
        feature = "integration_tests",
    )),
    feature = "analyzer_tests",
))]

/// TDD test for trait method self parameter inference
/// BUG: Trait methods with self parameter infer &self instead of self
///
/// Example:
/// ```windjammer
/// impl Neg for Vec2 {
///     type Output = Vec2;
///     fn neg(self) -> Vec2 {
///         Vec2::new(-self.x, -self.y)
///     }
/// }
/// ```
///
/// EXPECTED: fn neg(self) -> Vec2
/// ACTUAL: fn neg(&self) -> Vec2 ❌
use windjammer::analyzer::Analyzer;
use windjammer::codegen::rust::CodeGenerator;
use windjammer::lexer::Lexer;
use windjammer::parser::{Parser, Program};
use windjammer::CompilationTarget;

fn parse_code(code: &str) -> Program<'static> {
    let mut lexer = Lexer::new(code);
    let tokens = lexer.tokenize_with_locations();
    let parser = Box::leak(Box::new(Parser::new(tokens)));
    parser.parse().unwrap()
}

#[test]
fn test_trait_neg_impl_uses_owned_self() {
    let code = r#"
struct Vec2 {
    x: f32,
    y: f32,
}

impl Vec2 {
    pub fn new(x: f32, y: f32) -> Vec2 {
        Vec2 { x, y }
    }
}

impl Neg for Vec2 {
    type Output = Vec2;
    
    fn neg(self) -> Vec2 {
        Vec2::new(-self.x, -self.y)
    }
}
"#;

    let program = parse_code(code);
    let mut analyzer = Analyzer::new();
    let (analyzed_functions, analyzed_structs, _analyzed_trait_methods) =
        analyzer.analyze_program(&program).unwrap();
    let mut generator = CodeGenerator::new_for_module(analyzed_structs, CompilationTarget::Rust);
    let generated = generator.generate_program(&program, &analyzed_functions);

    // ASSERT: Should use owned self, not &self
    assert!(
        generated.contains("fn neg(self) -> Vec2"),
        "Trait method should use owned self!\nGenerated:\n{}",
        generated
    );

    // ASSERT: Should NOT use &self
    assert!(
        !generated.contains("fn neg(&self) -> Vec2"),
        "Trait method should NOT use &self!\nGenerated:\n{}",
        generated
    );
}

#[test]
fn test_trait_add_impl_uses_owned_self() {
    let code = r#"
struct Vec2 {
    x: f32,
    y: f32,
}

impl Vec2 {
    pub fn new(x: f32, y: f32) -> Vec2 {
        Vec2 { x, y }
    }
}

impl Add for Vec2 {
    type Output = Vec2;
    
    fn add(self, other: Vec2) -> Vec2 {
        Vec2::new(self.x + other.x, self.y + other.y)
    }
}
"#;

    let program = parse_code(code);
    let mut analyzer = Analyzer::new();
    let (analyzed_functions, analyzed_structs, _analyzed_trait_methods) =
        analyzer.analyze_program(&program).unwrap();
    let mut generator = CodeGenerator::new_for_module(analyzed_structs, CompilationTarget::Rust);
    let generated = generator.generate_program(&program, &analyzed_functions);

    // ASSERT: Both self and other should be owned
    assert!(
        generated.contains("fn add(self, other: Vec2) -> Vec2"),
        "Trait method should use owned self and other!\nGenerated:\n{}",
        generated
    );
}

#[test]
fn test_non_trait_method_can_infer_ref() {
    let code = r#"
struct Vec2 {
    x: f32,
    y: f32,
}

impl Vec2 {
    pub fn length(self) -> f32 {
        (self.x * self.x + self.y * self.y).sqrt()
    }
}
"#;

    let program = parse_code(code);
    let mut analyzer = Analyzer::new();
    let (analyzed_functions, analyzed_structs, _analyzed_trait_methods) =
        analyzer.analyze_program(&program).unwrap();
    let mut generator = CodeGenerator::new_for_module(analyzed_structs, CompilationTarget::Rust);
    let generated = generator.generate_program(&program, &analyzed_functions);

    // ASSERT: Non-trait methods can infer &self or self for read-only access
    // Vec2 is Copy, so self (by value) is equally correct
    assert!(
        generated.contains("length(&self)") || generated.contains("length(self)"),
        "Non-trait read-only method should infer &self or self (Copy)!\nGenerated:\n{}",
        generated
    );
    assert!(
        !generated.contains("length(&mut self)"),
        "Read-only method must NOT be &mut self!\nGenerated:\n{}",
        generated
    );
}