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use std::fmt;
use rb_sys::ruby_value_type;
use crate::{
error::Error,
into_value::IntoValue,
object::Object,
try_convert::TryConvert,
value::{
private::{self, ReprValue as _},
NonZeroValue, ReprValue, Value,
},
Ruby,
};
/// A Value pointer to a RObject struct, Ruby's internal representation of
/// generic objects, not covered by the other R* types.
///
/// See the [`ReprValue`] and [`Object`] traits for additional methods
/// available on this type.
#[derive(Clone, Copy)]
#[repr(transparent)]
pub struct RObject(NonZeroValue);
impl RObject {
/// Return `Some(RObject)` if `val` is a `RObject`, `None` otherwise.
///
/// # Examples
///
/// ```
/// use magnus::{eval, RObject};
/// # let _cleanup = unsafe { magnus::embed::init() };
///
/// assert!(RObject::from_value(eval("Object.new").unwrap()).is_some());
///
/// // many built-in types have specialised implementations and are not
/// // RObjects
/// assert!(RObject::from_value(eval(r#""example""#).unwrap()).is_none());
/// assert!(RObject::from_value(eval("1").unwrap()).is_none());
/// assert!(RObject::from_value(eval("[]").unwrap()).is_none());
/// ```
#[inline]
pub fn from_value(val: Value) -> Option<Self> {
unsafe {
(val.rb_type() == ruby_value_type::RUBY_T_OBJECT)
.then(|| Self(NonZeroValue::new_unchecked(val)))
}
}
}
impl fmt::Display for RObject {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", unsafe { self.to_s_infallible() })
}
}
impl fmt::Debug for RObject {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.inspect())
}
}
impl IntoValue for RObject {
#[inline]
fn into_value_with(self, _: &Ruby) -> Value {
self.0.get()
}
}
impl Object for RObject {}
unsafe impl private::ReprValue for RObject {}
impl ReprValue for RObject {}
impl TryConvert for RObject {
fn try_convert(val: Value) -> Result<Self, Error> {
Self::from_value(val).ok_or_else(|| {
Error::new(
Ruby::get_with(val).exception_type_error(),
format!("no implicit conversion of {} into Object", unsafe {
val.classname()
},),
)
})
}
}