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|
use super::*;
/// Evaluate a code snippet, returning a value.
fn parse_eval(code: &str) -> Value {
let chars: Vec<char> = code.chars().collect();
let tokens = scanner::scan(&chars).expect("could not scan code");
let program = parser::parse(tokens).expect("could not parse code");
Interpreter::create()
.interpret(program)
.expect("could not eval code")
}
#[test]
fn test_if() {
let result = parse_eval(
r#"
if (42 > 23)
"pass";
else
"fail";
"#,
);
assert_eq!(Value::Literal(Literal::String("pass".into())), result,);
}
#[test]
fn test_scope() {
let result = parse_eval(
r#"
var result = "";
var a = "global a, ";
var b = "global b, ";
var c = "global c";
{
var a = "outer a, ";
var b = "outer b, ";
{
var a = "inner a, ";
result = a + b + c;
}
}
"#,
);
assert_eq!(
Value::Literal(Literal::String("inner a, outer b, global c".into())),
result,
);
}
#[test]
fn test_binary_operators() {
assert_eq!(Value::Literal(Literal::Number(42.0)), parse_eval("40 + 2;"));
assert_eq!(
Value::Literal(Literal::String("foobar".into())),
parse_eval("\"foo\" + \"bar\";")
);
}
#[test]
fn test_functions() {
let result = parse_eval(
r#"
fun add(a, b, c) {
a + b + c;
}
add(1, 2, 3);
"#,
);
assert_eq!(Value::Literal(Literal::Number(6.0)), result);
}
#[test]
fn test_closure() {
let result = parse_eval(
r#"
fun makeCounter() {
var i = 0;
fun count() {
i = i + 1;
}
return count;
}
var counter = makeCounter();
counter(); // "1".
counter(); // "2".
"#,
);
assert_eq!(Value::Literal(Literal::Number(2.0)), result);
}
|
