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basic std::error::Error implementations for Error and VerboseError

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This commit is contained in:
Geoffroy Couprie 2020-08-24 14:51:03 +02:00
parent 981d036ca8
commit bf83d5d978
1 changed files with 25 additions and 0 deletions
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25
src/error.rs
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@ -72,6 +72,16 @@ impl<I> ParseError<I> for Error<I> {
impl<I> ContextError<I> for Error<I> {}
/// The Display implementation allows the std::error::Error implementation
impl<I: std::fmt::Display> std::fmt::Display for Error<I> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "error {:?} at: {}", self.code, self.input)
}
}
impl<I: std::fmt::Debug+std::fmt::Display> std::error::Error for Error<I> { }
// for backward compatibility, keep those trait implementations
// for the previously used error type
impl<I> ParseError<I> for (I, ErrorKind) {
fn from_error_kind(input: I, kind: ErrorKind) -> Self {
(input, kind)
@ -155,6 +165,21 @@ impl<I> ContextError<I> for VerboseError<I> {
}
}
impl<I: std::fmt::Display> std::fmt::Display for VerboseError<I> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "Parse error:\n")?;
for (input, error) in &self.errors {
match error {
VerboseErrorKind::Nom(e) => write!(f, "{:?} at: {}\n", e, input)?,
VerboseErrorKind::Char(c) => write!(f, "expected '{}' at: {}\n", c, input)?,
VerboseErrorKind::Context(s) => write!(f, "in section '{}', at: {}\n", s, input)?,
}
}
Ok(())
}
}
use crate::internal::{Err, IResult};
/// Create a new error from an input position, a static string and an existing error.