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use std::error::{Error as StdError};
use std::fmt::{self, Display};
#[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
pub enum CoreError {
AdvancedFailedAutomaton,
QuotedStringAlreadyEnded,
UnquoteableCharQuoted,
DoesNotStartWithDQuotes,
DoesNotEndWithDQuotes,
InvalidChar,
ZeroSizedValue
}
impl CoreError {
pub fn id(&self) -> u8 {
use self::CoreError::*;
match *self {
AdvancedFailedAutomaton => 0,
QuotedStringAlreadyEnded => 1,
UnquoteableCharQuoted => 2,
DoesNotStartWithDQuotes => 3,
DoesNotEndWithDQuotes => 4,
InvalidChar => 5,
ZeroSizedValue => 6,
}
}
pub fn from_id(id: u8) -> Option<Self> {
use self::CoreError::*;
Some(match id {
0 => AdvancedFailedAutomaton,
1 => QuotedStringAlreadyEnded,
2 => UnquoteableCharQuoted,
3 => DoesNotStartWithDQuotes,
4 => DoesNotEndWithDQuotes,
5 => InvalidChar,
6 => ZeroSizedValue,
_ => return None
})
}
}
impl Display for CoreError {
fn fmt(&self, fter: &mut fmt::Formatter) -> fmt::Result {
fter.write_str(self.description())
}
}
impl StdError for CoreError {
fn description(&self) -> &'static str {
use self::CoreError::*;
match *self {
AdvancedFailedAutomaton =>
"advanced automaton after it entered the failed state",
QuotedStringAlreadyEnded =>
"continued to use the automaton after the end of the quoted string was found",
UnquoteableCharQuoted =>
"a char was escaped with a quoted-pair which can not be represented with a quoted-pair",
DoesNotStartWithDQuotes =>
"quoted string did not start with \"",
DoesNotEndWithDQuotes =>
"quoted string did not end with \"",
InvalidChar =>
"char can not be represented in a quoted string (without encoding)",
ZeroSizedValue =>
"value had a size of zero chars/bytes but has to have at last one"
}
}
}