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use std::error;
use std::fmt::{self, Display};
#[derive(Debug, PartialEq, Clone)]
pub enum Error {
Incomplete,
Mismatch {
message: String,
position: usize,
},
Conversion {
message: String,
position: usize,
},
Expect {
message: String,
position: usize,
inner: Box<Error>,
},
Custom {
message: String,
position: usize,
inner: Option<Box<Error>>,
},
}
impl error::Error for Error {
fn description(&self) -> &'static str {
"Parse error"
}
}
impl Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Error::Incomplete => write!(f, "Incomplete"),
Error::Mismatch {
ref message,
ref position,
} => write!(f, "Mismatch at {}: {}", position, message),
Error::Conversion {
ref message,
ref position,
} => write!(f, "Conversion failed at {}: {}", position, message),
Error::Expect {
ref message,
ref position,
ref inner,
} => write!(f, "{} at {}: {}", message, position, inner),
Error::Custom {
ref message,
ref position,
inner: Some(ref inner),
} => write!(f, "{} at {}, (inner: {})", message, position, inner),
Error::Custom {
ref message,
ref position,
inner: None,
} => write!(f, "{} at {}", message, position),
}
}
}
pub type Result<O> = ::std::result::Result<O, Error>;