forked from Orchid/orchid
68 lines
1.8 KiB
Rust
68 lines
1.8 KiB
Rust
//! Errors produced by the interpreter
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use std::error::Error;
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use std::fmt;
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use std::sync::Arc;
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use dyn_clone::DynClone;
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use crate::error::ProjectErrorObj;
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use crate::location::CodeLocation;
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/// Errors produced by external code when runtime-enforced assertions are
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/// violated.
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pub trait RTError: fmt::Display + Send + Sync + DynClone {
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/// Convert into trait object
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#[must_use]
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fn pack(self) -> RTErrorObj
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where Self: 'static + Sized {
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Arc::new(self)
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}
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}
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impl fmt::Debug for dyn RTError {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { write!(f, "ExternError({self})") }
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}
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impl Error for dyn RTError {}
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impl RTError for ProjectErrorObj {}
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/// An error produced by Rust code called form Orchid. The error is type-erased.
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pub type RTErrorObj = Arc<dyn RTError>;
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/// A result produced by Rust code called from Orchid.
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pub type RTResult<T> = Result<T, RTErrorObj>;
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/// Some expectation (usually about the argument types of a function) did not
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/// hold.
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#[derive(Clone)]
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pub struct AssertionError {
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location: CodeLocation,
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message: &'static str,
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details: String,
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}
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impl AssertionError {
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/// Construct, upcast and wrap in a Result that never succeeds for easy
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/// short-circuiting
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pub fn fail<T>(location: CodeLocation, message: &'static str, details: String) -> RTResult<T> {
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Err(Self::ext(location, message, details))
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}
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/// Construct and upcast to [RTErrorObj]
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pub fn ext(location: CodeLocation, message: &'static str, details: String) -> RTErrorObj {
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Self { location, message, details }.pack()
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}
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}
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impl fmt::Display for AssertionError {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "Error: expected {}", self.message)?;
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write!(f, " at {}", self.location)?;
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write!(f, " details: {}", self.details)
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}
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}
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impl RTError for AssertionError {}
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