dust/dust-lang/tests/functions.rs

use dust_lang::*;

#[test]
fn function() {
    let source = "fn(a: int, b: int) -> int { a + b }";

    assert_eq!(
        run(source),
        Ok(Some(ValueOwned::function(Chunk::with_data(
            None,
            vec![
                (Instruction::add(2, 0, 1), Span(30, 31)),
                (Instruction::r#return(true), Span(35, 35)),
            ],
            vec![ValueOwned::string("a"), ValueOwned::string("b"),],
            vec![
                Local::new(0, Type::Integer, false, Scope::default()),
                Local::new(1, Type::Integer, false, Scope::default())
            ]
        ))))
    );
}

#[test]
fn function_call() {
    let source = "fn(a: int, b: int) -> int { a + b }(1, 2)";

    assert_eq!(
        compile(source),
        Ok(Chunk::with_data(
            None,
            vec![
                (Instruction::load_constant(0, 0, false), Span(0, 36)),
                (Instruction::load_constant(1, 1, false), Span(36, 37)),
                (Instruction::load_constant(2, 2, false), Span(39, 40)),
                (Instruction::call(3, 0, 2), Span(35, 41)),
                (Instruction::r#return(true), Span(41, 41)),
            ],
            vec![
                ValueOwned::function(Chunk::with_data(
                    None,
                    vec![
                        (Instruction::add(2, 0, 1), Span(30, 31)),
                        (Instruction::r#return(true), Span(35, 36)),
                    ],
                    vec![ValueOwned::string("a"), ValueOwned::string("b"),],
                    vec![
                        Local::new(0, Type::Integer, false, Scope::default()),
                        Local::new(1, Type::Integer, false, Scope::default())
                    ]
                )),
                ValueOwned::integer(1),
                ValueOwned::integer(2)
            ],
            vec![]
        )),
    );

    assert_eq!(run(source), Ok(Some(ValueOwned::integer(3))));
}

#[test]
fn function_declaration() {
    let source = "fn add (a: int, b: int) -> int { a + b }";

    assert_eq!(
        compile(source),
        Ok(Chunk::with_data(
            None,
            vec![
                (Instruction::load_constant(0, 1, false), Span(0, 40)),
                (Instruction::define_local(0, 0, false), Span(3, 6)),
                (Instruction::r#return(false), Span(40, 40))
            ],
            vec![
                ValueOwned::string("add"),
                ValueOwned::function(Chunk::with_data(
                    None,
                    vec![
                        (Instruction::add(2, 0, 1), Span(35, 36)),
                        (Instruction::r#return(true), Span(40, 40)),
                    ],
                    vec![ValueOwned::string("a"), ValueOwned::string("b")],
                    vec![
                        Local::new(0, Type::Integer, false, Scope::default()),
                        Local::new(1, Type::Integer, false, Scope::default())
                    ]
                ),)
            ],
            vec![Local::new(
                0,
                Type::Function(FunctionType {
                    type_parameters: None,
                    value_parameters: Some(vec![(0, Type::Integer), (1, Type::Integer)]),
                    return_type: Box::new(Type::Integer),
                }),
                false,
                Scope::default(),
            )],
        )),
    );

    assert_eq!(run(source), Ok(None));
}