1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169

//! Ruby error handling types.
//!
//! This module implements the [`Exception`] class from Ruby Core. It is a
//! collection of error types that the interpreter uses to unwind the stack in
//! the event of an error with [`Kernel#raise`].
//!
//! You can use these types by accessing them in the interpreter. The types are
//! globally available in the root namespace.
//!
//! ```ruby
//! RuntimeError.new
//!
//! raise ArgumentError, "missing semicolon"
//! ```
//!
//! This module implements the core exception types with [`spinoso-exception`]
//! and re-exports these types.
//!
//! [`Exception`]: https://ruby-doc.org/core-2.6.3/Exception.html
//! [`Kernel#raise`]: https://ruby-doc.org/core-2.6.3/Kernel.html#method-i-raise
//! [`spinoso-exception`]: spinoso_exception

use std::borrow::Cow;

#[doc(inline)]
pub use spinoso_exception::core::*;

use crate::extn::prelude::*;

pub mod mruby;

/// Implement traits to convert Spinoso exceptions to artichoke-backend error
/// types.
///
/// This macro implements the artichoke-backend trait [`RubyException`]. This
/// trait differs from [`RubyException` in spinoso-exception] by having
/// additional APIs for gluing to the mruby VM, such as [backtraces].
///
/// [`RubyException` in spinoso-exception]: spinoso_exception::RubyException
/// [backtraces]: RubyException::vm_backtrace
macro_rules! ruby_exception_impl {
    ($exc:ident) => {
        impl From<$exc> for Error {
            fn from(exception: $exc) -> Error {
                Error::from(Box::<dyn RubyException>::from(exception))
            }
        }

        impl From<Box<$exc>> for Error {
            fn from(exception: Box<$exc>) -> Error {
                Error::from(Box::<dyn RubyException>::from(exception))
            }
        }

        impl From<$exc> for Box<dyn RubyException> {
            fn from(exception: $exc) -> Box<dyn RubyException> {
                Box::new(exception)
            }
        }

        impl From<Box<$exc>> for Box<dyn RubyException> {
            fn from(exception: Box<$exc>) -> Box<dyn RubyException> {
                exception
            }
        }

        impl RubyException for $exc {
            fn message(&self) -> Cow<'_, [u8]> {
                Cow::Borrowed(Self::message(self))
            }

            fn name(&self) -> Cow<'_, str> {
                Cow::Borrowed(Self::name(self))
            }

            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.convert_mut(self.message());
                let value = interp.new_instance::<Self>(&[message]).ok().flatten()?;
                Some(value.inner())
            }
        }
    };
}

ruby_exception_impl!(Exception);
ruby_exception_impl!(NoMemoryError);
ruby_exception_impl!(ScriptError);
ruby_exception_impl!(LoadError);
ruby_exception_impl!(NotImplementedError);
ruby_exception_impl!(SyntaxError);
ruby_exception_impl!(SecurityError);
ruby_exception_impl!(SignalException);
ruby_exception_impl!(Interrupt);
// Default for `rescue`.
ruby_exception_impl!(StandardError);
ruby_exception_impl!(ArgumentError);
ruby_exception_impl!(UncaughtThrowError);
ruby_exception_impl!(EncodingError);
ruby_exception_impl!(FiberError);
ruby_exception_impl!(IOError);
ruby_exception_impl!(EOFError);
ruby_exception_impl!(IndexError);
ruby_exception_impl!(KeyError);
ruby_exception_impl!(StopIteration);
ruby_exception_impl!(LocalJumpError);
ruby_exception_impl!(NameError);
ruby_exception_impl!(NoMethodError);
ruby_exception_impl!(RangeError);
ruby_exception_impl!(FloatDomainError);
ruby_exception_impl!(RegexpError);
// Default `Exception` type for `raise`.
ruby_exception_impl!(RuntimeError);
ruby_exception_impl!(FrozenError);
ruby_exception_impl!(SystemCallError);
// ruby_exception_impl!(Errno::*);
ruby_exception_impl!(ThreadError);
ruby_exception_impl!(TypeError);
ruby_exception_impl!(ZeroDivisionError);
ruby_exception_impl!(SystemExit);
ruby_exception_impl!(SystemStackError);
// Fatal interpreter error. Impossible to rescue.
ruby_exception_impl!(Fatal);

#[cfg(test)]
mod tests {
    use bstr::ByteSlice;

    use crate::test::prelude::*;

    struct Run;

    unsafe extern "C" fn run_run(mrb: *mut sys::mrb_state, _slf: sys::mrb_value) -> sys::mrb_value {
        unwrap_interpreter!(mrb, to => guard);
        let exc = RuntimeError::with_message("something went wrong");
        error::raise(guard, exc)
    }

    impl File for Run {
        type Artichoke = Artichoke;

        type Error = Error;

        fn require(interp: &mut Artichoke) -> Result<(), Self::Error> {
            let spec = class::Spec::new("Run", None, None).unwrap();
            class::Builder::for_spec(interp, &spec)
                .add_self_method("run", run_run, sys::mrb_args_none())?
                .define()?;
            interp.def_class::<Self>(spec)?;
            Ok(())
        }
    }

    #[test]
    fn raise() {
        let mut interp = interpreter().unwrap();
        Run::require(&mut interp).unwrap();
        let err = interp.eval(b"Run.run").unwrap_err();
        assert_eq!("RuntimeError", err.name().as_ref());
        assert_eq!(b"something went wrong".as_bstr(), err.message().as_ref().as_bstr());
        let expected_backtrace = b"(eval):1".to_vec();
        let actual_backtrace = bstr::join("\n", err.vm_backtrace(&mut interp).unwrap());
        assert_eq!(expected_backtrace, actual_backtrace);
    }
}