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use super::llist::LList;
use std::fmt;
use std::error::Error;
pub struct KErr {
pub err : String,
chain : LList<String>,
}
impl KErr {
pub fn new(err:&str) -> Self {
Self{err:err.to_string(), chain:LList::new()}
}
pub fn pre(mut self, info:&str) -> Self {
self.chain = self.chain.prepend(info.to_string());
self
}
}
impl fmt::Display for KErr {
fn fmt(&self, f:&mut fmt::Formatter) -> Result<(), fmt::Error> {
let mut nonempty = false;
for node in self.chain.iter() {
if nonempty { write!(f, " : ")?; }
nonempty = true;
write!(f, "{}", node.head().unwrap())?;
}
if nonempty { write!(f, " : ")?; }
write!(f, "{}", self.err)?;
Ok(())
}
}
impl fmt::Debug for KErr {
fn fmt(&self, f:&mut fmt::Formatter) -> Result<(), fmt::Error> {
write!(f, "KErr{{ err:{:?}, chain:{} }}", self.err, self.chain)
}
}
impl PartialEq for KErr {
fn eq(&self, other:&Self) -> bool { self.err==other.err }
}
impl Error for KErr {
}