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//! # ksl::builtin::plugin
//!
//! Built-in function `Plugin`.
use crate::{Environment, builtin::eval_builtin, eval::apply::eval_apply, value::Value};
pub(crate) fn builtin(args: &[Value], env: &Environment) -> Option<(Value, Environment)> {
if let [id @ Value::Identity(_), libfunc] = &args[..] {
match eval_apply(libfunc, env) {
Some((Value::String(lib_and_func), _)) => {
if let [libname, func_name] = &lib_and_func.split("/").collect::<Vec<&str>>()[..] {
eval_builtin(
"Let",
&[
id.clone(),
Value::Plugin(libname.to_string(), func_name.to_string()),
],
env,
)
} else {
eprintln!(
concat!(
"Error[ksl::builtin::plugin]: ",
"Failed to get library path, ",
"expected format is `library_name/function_name`, ",
"but got `{:?}`."
),
lib_and_func
);
None
}
}
Some((e, _)) => {
eprintln!(
concat!(
"Error[ksl::builtin::plugin]: ",
"Expected a string, but got `{:?}`."
),
e
);
None
}
None => {
eprintln!(
concat!(
"Error[ksl::builtin::plugin]: ",
"Cannot evaluate expression {:?}."
),
libfunc
);
None
}
}
} else {
eprintln!(concat!(
"Error[ksl::builtin::plugin]: ",
"Only accepts a symbol and a value as arguments.",
));
None
}
}