114 lines
3 KiB
Rust
114 lines
3 KiB
Rust
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#[macro_export]
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macro_rules! generate_error_types {
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(
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$name: ident,
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$kindname: ident,
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$($kind:ident => $string:expr),*
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) => {
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#[derive(Clone, Copy, Debug, PartialEq)]
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pub enum $kindname {
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$( $kind ),*
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}
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impl Display for $kindname {
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fn fmt(&self, fmt: &mut Formatter) -> Result<(), FmtError> {
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let s = match *self {
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$( $kindname::$kind => $string ),*
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};
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try!(write!(fmt, "{}", s));
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Ok(())
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}
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}
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#[derive(Debug)]
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pub struct $name {
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err_type: $kindname,
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cause: Option<Box<Error>>,
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}
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impl $name {
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pub fn new(errtype: $kindname, cause: Option<Box<Error>>) -> $name {
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$name {
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err_type: errtype,
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cause: cause,
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}
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}
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pub fn err_type(&self) -> $kindname {
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self.err_type
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}
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}
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impl Display for $name {
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fn fmt(&self, fmt: &mut Formatter) -> Result<(), FmtError> {
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try!(write!(fmt, "[{}]", self.err_type));
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Ok(())
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}
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}
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impl Error for $name {
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fn description(&self) -> &str {
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match self.err_type {
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$( $kindname::$kind => $string ),*
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}
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}
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fn cause(&self) -> Option<&Error> {
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self.cause.as_ref().map(|e| &**e)
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}
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}
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}
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}
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#[cfg(test)]
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mod test {
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use std::error::Error;
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use std::fmt::Error as FmtError;
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use std::fmt::{Display, Formatter};
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generate_error_types!(TestError, TestErrorKind,
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TestErrorKindA => "testerrorkind a",
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TestErrorKindB => "testerrorkind B");
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#[test]
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fn test_a() {
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let kind = TestErrorKind::TestErrorKindA;
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assert_eq!(String::from("testerrorkind a"), format!("{}", kind));
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let e = TestError::new(kind, None);
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assert_eq!(String::from("[testerrorkind a]"), format!("{}", e));
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}
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#[test]
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fn test_b() {
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let kind = TestErrorKind::TestErrorKindB;
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assert_eq!(String::from("testerrorkind B"), format!("{}", kind));
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let e = TestError::new(kind, None);
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assert_eq!(String::from("[testerrorkind B]"), format!("{}", e));
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}
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#[test]
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fn test_ab() {
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let kinda = TestErrorKind::TestErrorKindA;
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let kindb = TestErrorKind::TestErrorKindB;
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assert_eq!(String::from("testerrorkind a"), format!("{}", kinda));
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assert_eq!(String::from("testerrorkind B"), format!("{}", kindb));
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let e = TestError::new(kinda, Some(Box::new(TestError::new(kindb, None))));
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assert_eq!(String::from("[testerrorkind a]"), format!("{}", e));
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assert_eq!(TestErrorKind::TestErrorKindA, e.err_type());
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assert_eq!(String::from("[testerrorkind B]"), format!("{}", e.cause().unwrap()));
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}
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}
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