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dust/dust-lang/tests/variables.rs

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1.8 KiB
Rust
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use dust_lang::*;
#[test]
fn define_local() {
let source = "let x = 42;";
assert_eq!(
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compile(source),
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Ok(Chunk::with_data(
None,
vec![
(Instruction::load_constant(0, 0, false), Span(8, 10)),
(Instruction::define_local(0, 0, false), Span(4, 5)),
(Instruction::r#return(false), Span(11, 11))
],
vec![Value::integer(42), Value::string("x")],
vec![Local::new(1, None, false, Scope::default(), 0)]
)),
);
assert_eq!(run(source), Ok(None));
}
#[test]
fn let_statement_expects_identifier() {
let source = "let 1 = 2";
assert_eq!(
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compile(source),
Err(DustError::Compile {
error: CompileError::ExpectedToken {
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expected: TokenKind::Identifier,
found: Token::Integer("1").to_owned(),
position: Span(4, 5)
},
source
})
);
}
#[test]
fn set_local() {
let source = "let mut x = 41; x = 42; x";
assert_eq!(
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compile(source),
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Ok(Chunk::with_data(
None,
vec![
(Instruction::load_constant(0, 0, false), Span(12, 14)),
(Instruction::define_local(0, 0, true), Span(8, 9)),
(Instruction::load_constant(1, 2, false), Span(20, 22)),
(Instruction::set_local(1, 0), Span(16, 17)),
(Instruction::get_local(2, 0), Span(24, 25)),
(Instruction::r#return(true), Span(25, 25)),
],
vec![Value::integer(41), Value::string("x"), Value::integer(42)],
vec![Local::new(1, None, true, Scope::default(), 0)]
)),
);
assert_eq!(run(source), Ok(Some(Value::integer(42))));
}