harn-vm 0.10.23

Async bytecode virtual machine for the Harn programming language
Documentation 
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//! Cron-expression validation shared by Harn scheduling callers.

use croner::Cron;

use crate::stdlib::macros::{harn_builtin, VmBuiltinDef};
use crate::stdlib::options::{expect_string_arg, ErrorKind};
use crate::value::{VmError, VmValue};
use crate::vm::Vm;

pub(crate) fn register_cron_builtins(vm: &mut Vm) {
    for def in MODULE_BUILTINS {
        vm.register_builtin_def(def);
    }
}

pub(crate) const MODULE_BUILTINS: &[&VmBuiltinDef] = &[&CRON_IS_VALID_BUILTIN_DEF];

#[harn_builtin(sig = "__cron_is_valid(expression: string) -> bool", category = "cron")]
fn cron_is_valid_builtin(args: &[VmValue], _out: &mut String) -> Result<VmValue, VmError> {
    let expression = expect_string_arg(args, 0, "__cron_is_valid", ErrorKind::Runtime)?;
    Ok(VmValue::Bool(expression.parse::<Cron>().is_ok()))
}