rhai/tests/modules.rs

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#![cfg(not(feature = "no_module"))]
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use rhai::{module_resolvers, Engine, EvalAltResult, Module, Scope, INT};
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#[test]
fn test_module() {
let mut module = Module::new();
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module.set_var("answer", 42 as INT);
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assert!(module.contains_var("answer"));
assert_eq!(module.get_var_value::<INT>("answer").unwrap(), 42);
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}
#[test]
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fn test_module_sub_module() -> Result<(), Box<EvalAltResult>> {
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let mut module = Module::new();
let mut sub_module = Module::new();
let mut sub_module2 = Module::new();
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sub_module2.set_var("answer", 41 as INT);
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let hash_inc = sub_module2.set_fn_1("inc", |x: INT| Ok(x + 1));
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sub_module.set_sub_module("universe", sub_module2);
module.set_sub_module("life", sub_module);
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assert!(module.contains_sub_module("life"));
let m = module.get_sub_module("life").unwrap();
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assert!(m.contains_sub_module("universe"));
let m2 = m.get_sub_module("universe").unwrap();
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assert!(m2.contains_var("answer"));
assert!(m2.contains_fn(hash_inc));
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assert_eq!(m2.get_var_value::<INT>("answer").unwrap(), 41);
let engine = Engine::new();
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let mut scope = Scope::new();
scope.push_module("question", module);
assert_eq!(
engine.eval_expression_with_scope::<INT>(
&mut scope,
"question::life::universe::answer + 1"
)?,
42
);
assert_eq!(
engine.eval_expression_with_scope::<INT>(
&mut scope,
"question::life::universe::inc(question::life::universe::answer)"
)?,
42
);
Ok(())
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}
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#[test]
fn test_module_resolver() -> Result<(), Box<EvalAltResult>> {
let mut resolver = module_resolvers::StaticModuleResolver::new();
let mut module = Module::new();
module.set_var("answer", 42 as INT);
resolver.insert("hello".to_string(), module);
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let mut engine = Engine::new();
engine.set_module_resolver(Some(resolver));
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assert_eq!(
engine.eval::<INT>(
r#"
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import "hello" as h1;
import "hello" as h2;
h2::answer
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"#
)?,
42
);
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engine.set_max_modules(5);
assert!(matches!(
*engine
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.eval::<INT>(
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r#"
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let sum = 0;
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for x in range(0, 10) {
import "hello" as h;
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sum += h::answer;
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}
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sum
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"#
)
.expect_err("should error"),
EvalAltResult::ErrorTooManyModules(_)
));
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#[cfg(not(feature = "no_function"))]
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assert!(matches!(
*engine
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.eval::<INT>(
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r#"
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let sum = 0;
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fn foo() {
import "hello" as h;
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sum += h::answer;
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}
for x in range(0, 10) {
foo();
}
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sum
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"#
)
.expect_err("should error"),
EvalAltResult::ErrorInFunctionCall(fn_name, _, _) if fn_name == "foo"
));
engine.set_max_modules(0);
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#[cfg(not(feature = "no_function"))]
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engine.eval::<()>(
r#"
fn foo() {
import "hello" as h;
}
for x in range(0, 10) {
foo();
}
"#,
)?;
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Ok(())
}
#[test]
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#[cfg(not(feature = "no_function"))]
fn test_module_from_ast() -> Result<(), Box<EvalAltResult>> {
let mut engine = Engine::new();
let mut resolver = rhai::module_resolvers::StaticModuleResolver::new();
let mut sub_module = Module::new();
sub_module.set_var("foo", true);
resolver.insert("another module".to_string(), sub_module);
engine.set_module_resolver(Some(resolver));
let ast = engine.compile(
r#"
// Functions become module functions
fn calc(x) {
x + 1
}
fn add_len(x, y) {
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x + len(y)
}
private fn hidden() {
throw "you shouldn't see me!";
}
// Imported modules become sub-modules
import "another module" as extra;
// Variables defined at global level become module variables
const x = 123;
let foo = 41;
let hello;
// Final variable values become constant module variable values
foo = calc(foo);
hello = "hello, " + foo + " worlds!";
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export
x as abc,
foo,
hello,
extra as foobar;
"#,
)?;
let module = Module::eval_ast_as_new(Scope::new(), &ast, &engine)?;
let mut scope = Scope::new();
scope.push_module("testing", module);
assert_eq!(
engine.eval_expression_with_scope::<INT>(&mut scope, "testing::abc")?,
123
);
assert_eq!(
engine.eval_expression_with_scope::<INT>(&mut scope, "testing::foo")?,
42
);
assert!(engine.eval_expression_with_scope::<bool>(&mut scope, "testing::foobar::foo")?);
assert_eq!(
engine.eval_expression_with_scope::<String>(&mut scope, "testing::hello")?,
"hello, 42 worlds!"
);
assert_eq!(
engine.eval_expression_with_scope::<INT>(&mut scope, "testing::calc(999)")?,
1000
);
assert_eq!(
engine.eval_expression_with_scope::<INT>(
&mut scope,
"testing::add_len(testing::foo, testing::hello)"
)?,
59
);
assert!(matches!(
*engine
.eval_expression_with_scope::<()>(&mut scope, "testing::hidden()")
.expect_err("should error"),
EvalAltResult::ErrorFunctionNotFound(fn_name, _) if fn_name == "hidden"
));
Ok(())
}