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use std::{fmt::{Debug, Display}, error::Error};
use crate::prelude::*;
#[macro_export]
macro_rules! exception {
($type:expr) => {
$crate::prelude::Exception::new($type)
};
($type:expr, $($arg:tt)*) => {
$crate::prelude::Exception::msg($type, format!($($arg)*).as_str())
};
}
pub const HASH_EXCEPTION: &'static str = "hash";
pub const VALUE_EXCEPTION: &'static str = "value";
pub const PARSE_EXCEPTION: &'static str = "parse";
pub const COMPILE_EXCEPTION: &'static str = "compile";
pub const RUNTIME_EXCEPTION: &'static str = "runtime";
pub const BINARY_EXECPTION: &'static str = "binary";
pub const IO_EXECPTION: &'static str = "io";
#[derive(Clone)]
pub struct Exception(Gc<ExceptionInner>);
#[derive(Clone)]
struct ExceptionInner {
ty: Rc<str>,
msg: Rc<str>,
trace: Vec<(Rc<str>, Position)>
}
impl Exception {
pub fn msg(ty: &str, msg: &str) -> Self {
Self(Gc::new(ExceptionInner { ty: ty.into(), msg: msg.into(), trace: Vec::new() }))
}
pub fn pos(mut self, pos: Position) -> Self {
self.0.trace.push((
Rc::from("<root>"),
pos
));
self
}
pub fn trace(mut self, block: Rc<str>, pos: Position) -> Self {
self.0.trace.push((
block,
pos
));
self
}
}
impl Display for Exception {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let ty = self.0.ty.as_ref();
let msg = self.0.msg.as_ref();
write!(f, "{}\n Type <{}>", msg, ty)?;
for (block, pos) in self.0.trace.iter() {
write!(f, "\n In {block} at {pos}\n")?;
}
Ok(())
}
}
impl Debug for Exception {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "[Exception {}]", self.0.ty.as_ref())
}
}
impl Error for Exception {}
impl<T> From<Exception> for Result<T> {
fn from(value: Exception) -> Self {
Err(value)
}
}
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