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use std::error;
use std::fmt;
use std::io;
use std::str;
#[derive(Clone, Debug, Default, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub struct ErrorLine {
pub number: usize,
pub line: String,
}
impl ErrorLine {
pub fn new<S: Into<String>>(number: usize, line: S) -> ErrorLine {
ErrorLine {
number,
line: line.into(),
}
}
}
#[derive(Debug)]
pub enum ErrorKind {
NoSection(String),
MissingValue(String, String),
InvalidValue(String, String, String),
UnknownKey(String, String),
Runtime(String),
Utf8(str::Utf8Error),
Io(io::Error),
}
impl From<io::Error> for ErrorKind {
fn from(e: io::Error) -> ErrorKind {
ErrorKind::Io(e)
}
}
impl From<str::Utf8Error> for ErrorKind {
fn from(e: str::Utf8Error) -> ErrorKind {
ErrorKind::Utf8(e)
}
}
impl fmt::Display for ErrorKind {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
match self {
ErrorKind::NoSection(k) => write!(fmt, "Key '{}' must appear in a section", k),
ErrorKind::MissingValue(s, k) => {
write!(fmt, "Key '{}' in section '{}' requires a value", k, s)
}
ErrorKind::InvalidValue(s, k, v) => {
write!(fmt, "Invalid value for '{}' in section '{}': '{}'", k, s, v)
}
ErrorKind::Runtime(s) => write!(fmt, "Failed to execute pacman-conf: {}", s),
ErrorKind::UnknownKey(s, k) => write!(fmt, "Unknown key: '{}' in section '{}'", s, k),
ErrorKind::Io(err) => err.fmt(fmt),
ErrorKind::Utf8(err) => err.fmt(fmt),
}
}
}
#[derive(Debug)]
pub struct Error {
pub kind: ErrorKind,
pub line: Option<ErrorLine>,
}
impl error::Error for Error {}
impl From<ErrorKind> for Error {
fn from(kind: ErrorKind) -> Error {
Error { kind, line: None }
}
}
impl From<io::Error> for Error {
fn from(err: io::Error) -> Error {
ErrorKind::Io(err).into()
}
}
impl From<str::Utf8Error> for Error {
fn from(err: str::Utf8Error) -> Error {
ErrorKind::Utf8(err).into()
}
}
impl fmt::Display for Error {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
match self.line {
Some(ref line) => write!(fmt, "Line {}: {}: {}", line.number, self.kind, line.line),
None => write!(fmt, "{}", self.kind),
}
}
}