Lawrence Bethlenfalvy
c279301583
- pattern matching seems to be correct - dynamic dispatch works with the to_string example - template strings as a last-minute addition - interpreter revamp, virtual stack for abort safety
72 lines
1.7 KiB
Rust
72 lines
1.7 KiB
Rust
use std::error::Error;
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use std::fmt::{Debug, Display};
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use std::sync::Arc;
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use dyn_clone::DynClone;
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use crate::location::CodeLocation;
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/// Errors produced by external code
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pub trait ExternError: Display + Send + Sync + DynClone {
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/// Convert into trait object
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#[must_use]
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fn rc(self) -> ExternErrorObj
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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 Debug for dyn ExternError {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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write!(f, "ExternError({self})")
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}
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}
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impl Error for dyn ExternError {}
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/// An error produced by Rust code called form Orchid. The error is type-erased.
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pub type ExternErrorObj = Arc<dyn ExternError>;
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/// A result produced by Rust code called from Orchid.
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pub type ExternResult<T> = Result<T, ExternErrorObj>;
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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>(
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location: CodeLocation,
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message: &'static str,
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details: String,
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) -> ExternResult<T> {
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Err(Self::ext(location, message, details))
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}
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/// Construct and upcast to [ExternError]
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pub fn ext(
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location: CodeLocation,
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message: &'static str,
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details: String,
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) -> ExternErrorObj {
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Self { location, message, details }.rc()
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}
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}
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impl Display for AssertionError {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::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 ExternError for AssertionError {}
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