59 lines
1.5 KiB
Rust
59 lines
1.5 KiB
Rust
#![cfg(not(any(feature = "no_index", feature = "no_module")))]
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use rhai::plugin::*;
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use rhai::{Engine, EvalAltResult, INT};
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#[export_module]
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mod special_array_package {
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use rhai::{Array, INT};
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pub fn len(array: &mut Array, mul: INT) -> INT {
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(array.len() as INT) * mul
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}
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}
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macro_rules! gen_unary_functions {
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($op_name:ident = $op_fn:ident ( $($arg_type:ident),+ ) -> $return_type:ident) => {
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mod $op_name { $(
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pub mod $arg_type {
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use super::super::*;
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#[export_fn]
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pub fn single(x: $arg_type) -> $return_type {
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super::super::$op_fn(x)
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}
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}
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)* }
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}
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}
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macro_rules! reg_functions {
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($mod_name:ident += $op_name:ident :: $func:ident ( $($arg_type:ident),+ )) => {
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$(register_exported_fn!($mod_name, stringify!($op_name), $op_name::$arg_type::$func);)*
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}
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}
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fn make_greeting<T: std::fmt::Display>(n: T) -> String {
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format!("{} kitties", n)
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}
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gen_unary_functions!(greet = make_greeting(INT, bool, char) -> String);
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#[test]
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fn test_plugins_package() -> Result<(), Box<EvalAltResult>> {
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let mut engine = Engine::new();
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let m = exported_module!(special_array_package);
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engine.load_package(m);
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reg_functions!(engine += greet::single(INT, bool, char));
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assert_eq!(engine.eval::<INT>("let a = [1, 2, 3]; len(a, 2)")?, 6);
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assert_eq!(
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engine.eval::<String>("let a = [1, 2, 3]; greet(len(a, 2))")?,
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"6 kitties"
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);
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Ok(())
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}
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