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use std::borrow::Cow;
use std::error;
use std::fmt;
use std::mem;
use std::ptr::{self, NonNull};
use spinoso_exception::Fatal;
use crate::core::{ClassRegistry, TryConvertMut};
use crate::error::{Error, RubyException};
use crate::state::State;
use crate::sys;
use crate::Artichoke;
pub unsafe fn from_user_data(mrb: *mut sys::mrb_state) -> Result<Artichoke, InterpreterExtractError> {
let mut mrb = if let Some(mrb) = NonNull::new(mrb) {
mrb
} else {
emit_fatal_warning!("ffi: Attempted to extract Artichoke from null `mrb_state`");
return Err(InterpreterExtractError::new());
};
let ud = mem::replace(&mut mrb.as_mut().ud, ptr::null_mut());
let state = if let Some(state) = NonNull::new(ud) {
state.cast::<State>()
} else {
let alloc_ud = mem::replace(&mut mrb.as_mut().allocf_ud, ptr::null_mut());
if let Some(state) = NonNull::new(alloc_ud) {
state.cast::<State>()
} else {
emit_fatal_warning!("ffi: Attempted to extract Artichoke from null `mrb_state->ud` pointer");
return Err(InterpreterExtractError::new());
}
};
let state = Box::from_raw(state.as_ptr());
Ok(Artichoke::new(mrb, state))
}
#[derive(Default, Debug, Clone, Copy, Hash, PartialEq, Eq, PartialOrd, Ord)]
pub struct InterpreterExtractError {
_private: (),
}
impl InterpreterExtractError {
#[must_use]
pub const fn new() -> Self {
Self { _private: () }
}
}
impl fmt::Display for InterpreterExtractError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("Failed to extract Artichoke Ruby interpreter from mrb_state userdata")
}
}
impl error::Error for InterpreterExtractError {}
impl RubyException for InterpreterExtractError {
fn message(&self) -> Cow<'_, [u8]> {
Cow::Borrowed(b"Failed to extract Artichoke Ruby interpreter from mrb_state")
}
fn name(&self) -> Cow<'_, str> {
"fatal".into()
}
fn vm_backtrace(&self, interp: &mut Artichoke) -> Option<Vec<Vec<u8>>> {
let _ = interp;
None
}
fn as_mrb_value(&self, interp: &mut Artichoke) -> Option<sys::mrb_value> {
let message = interp.try_convert_mut(self.message()).ok()?;
let value = interp.new_instance::<Fatal>(&[message]).ok().flatten()?;
Some(value.inner())
}
}
impl From<InterpreterExtractError> for Error {
fn from(exception: InterpreterExtractError) -> Self {
let err: Box<dyn RubyException> = Box::new(exception);
Self::from(err)
}
}
#[cfg(test)]
mod tests {
use std::ptr::{self, NonNull};
use crate::ffi;
use crate::test::prelude::*;
#[test]
fn from_user_data_null_pointer() {
let err = unsafe { ffi::from_user_data(ptr::null_mut()) };
assert_eq!(err.err(), Some(InterpreterExtractError::new()));
}
#[test]
fn from_user_data_null_user_data() {
let mut interp = crate::interpreter().unwrap();
let mrb = interp.mrb.as_ptr();
let err = unsafe {
(*mrb).ud = ptr::null_mut();
ffi::from_user_data(mrb)
};
assert_eq!(err.err(), Some(InterpreterExtractError::new()));
interp.mrb = NonNull::new(mrb).unwrap();
interp.close();
}
#[test]
fn from_user_data() {
let interp = crate::interpreter().unwrap();
let res = unsafe {
let mrb = Artichoke::into_raw(interp);
ffi::from_user_data(mrb)
};
assert!(res.is_ok());
res.unwrap().close();
}
}