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use std::result;
use std::fmt;
use source_span::Span;
use crate::Located;
use super::Token;
pub enum Error {
IO(std::io::Error),
MissingClosingParenthesis,
UnexpectedToken(Token, Option<Token>),
UnknownCommand(String),
Server(String)
}
impl Error {
pub fn at(self, span: Span) -> Located<Error> {
Located::new(self, span)
}
}
pub type Result<T> = result::Result<T, Located<Error>>;
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
use self::Error::*;
match self {
IO(e) => write!(f, "io: {}", e),
MissingClosingParenthesis => write!(f, "missing parenthesis `)'"),
UnexpectedToken(t, None) => write!(f, "unexpected token `{}'", t),
UnexpectedToken(t, Some(e)) => write!(f, "unexpected token: excepted `{}', got `{}'", e, t),
UnknownCommand(name) => write!(f, "unknown command `{}'", name),
Server(name) => write!(f, "server error: {}", name)
}
}
}
impl crate::error::Informative for Error {
fn informations(&self, _i: &mut crate::error::Infos) {
}
}