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Document RuntimeArgs.

This commit is contained in:
Sergey Pepyakin 2018-01-31 19:06:54 +03:00
parent b97dc2db61
commit a6562a7260
1 changed files with 15 additions and 2 deletions
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17
src/host.rs
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@ -13,12 +13,20 @@ impl<'a> From<&'a [RuntimeValue]> for RuntimeArgs<'a> {
}
impl<'a> RuntimeArgs<'a> {
/// Extract argument by index `idx` returning error if cast is invalid or not enough arguments
/// Extract argument by index `idx`.
///
/// # Errors
///
/// Returns `Err` if cast is invalid or not enough arguments.
pub fn nth_checked<T>(&self, idx: usize) -> Result<T, Error> where RuntimeValue: TryInto<T, Error> {
Ok(self.nth_value_checked(idx)?.try_into().map_err(|_| Error::Value("Invalid argument cast".to_owned()))?)
}
/// Extract argument as a runtime value by index `idx` returning error is not enough arguments
/// Extract argument as a [`RuntimeValue`] by index `idx`.
///
/// # Errors
///
/// Returns `Err` if this list have not enough arguments.
pub fn nth_value_checked(&self, idx: usize) -> Result<RuntimeValue, Error> {
if self.0.len() <= idx {
return Err(Error::Value("Invalid argument index".to_owned()));
@ -26,6 +34,11 @@ impl<'a> RuntimeArgs<'a> {
Ok(self.0[idx])
}
/// Extract argument by index `idx`.
///
/// # Panics
///
/// Panics if cast is invalid or not enough arguments.
pub fn nth<T>(&self, idx: usize) -> T where RuntimeValue: TryInto<T, Error> {
let value = self.nth_value_checked(idx).expect("Invalid argument index");
value.try_into().expect("Unexpected argument type")