use std::error;
use std::fmt;
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum Error {
UnexpectedEnd,
UnexpectedText,
BadBackReference,
BadTemplateArgReference,
BadFunctionArgReference,
Overflow,
RecursiveDemangling,
TooMuchRecursion,
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
Error::UnexpectedEnd => write!(f, "mangled symbol ends abruptly"),
Error::UnexpectedText => write!(f, "mangled symbol is not well-formed"),
Error::BadBackReference => {
write!(f,
"back reference that is out-of-bounds of the substitution table")
}
Error::BadTemplateArgReference => {
write!(f, "reference to a template arg that is either out-of-bounds, or in a context without template args")
}
Error::BadFunctionArgReference => {
write!(f, "reference to a function arg that is either out-of-bounds, or in a context without function args")
}
Error::Overflow => {
write!(f,
"an overflow or underflow would occur when parsing an integer in a mangled symbol")
}
Error::RecursiveDemangling => {
write!(f, "demangling some part of the AST attempted to demangle itself again")
}
Error::TooMuchRecursion => {
write!(f, "encountered too much recursion when demangling symbol")
}
}
}
}
impl error::Error for Error {
fn description(&self) -> &str {
match *self {
Error::UnexpectedEnd => "mangled symbol ends abruptly",
Error::UnexpectedText => "mangled symbol is not well-formed",
Error::BadBackReference => "back reference that is out-of-bounds of the substitution table",
Error::BadTemplateArgReference => "reference to a template arg that is either out-of-bounds, or in a context without template args",
Error::BadFunctionArgReference => "reference to a function arg that is either out-of-bounds, or in a context without function args",
Error::Overflow => "an overflow or underflow would occur when parsing an integer in a mangled symbol",
Error::RecursiveDemangling => "demangling some part of the AST attempted to demangle itself again",
Error::TooMuchRecursion => "encountered too much recursion when demangling symbol"
}
}
}
pub type Result<T> = ::std::result::Result<T, Error>;