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// This file is part of ICU4X. For terms of use, please see the file
// called LICENSE at the top level of the ICU4X source tree
// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
use core::fmt::Debug;
use displaydoc::Display;
/// An error returned when parsing a pattern.
///
/// ✨ *Enabled with the `alloc` Cargo feature.*
///
/// # Examples
/// ```
/// use icu_pattern::{Parser, ParserError, ParserOptions};
///
/// let mut parser = Parser::<usize>::new("{0", ParserOptions::default());
/// assert_eq!(Err(ParserError::UnclosedPlaceholder), parser.try_next());
/// ```
///
/// # Type parameters
///
/// - `E`: An error of the replacement type which implements [`FromStr`].
///
/// [`FromStr`]: core::str::FromStr
#[derive(Display, Debug, PartialEq)]
#[non_exhaustive]
pub enum ParserError<E>
where
E: Debug,
{
/// Encountered an illegal character.
#[displaydoc("Illegal character: {0}.")]
IllegalCharacter(char),
/// Placeholder hould not be parsed from the given string slice.
#[displaydoc("Invalid placeholder: {0:?}")]
InvalidPlaceholder(E),
/// The pattern contains an unclosed placeholder.
#[displaydoc("Unclosed placeholder")]
UnclosedPlaceholder,
/// The pattern contains an unclosed quoted literal.
#[displaydoc("Unclosed quoted literal")]
UnclosedQuotedLiteral,
}
#[cfg(feature = "std")]
impl<E: Debug> std::error::Error for ParserError<E> {}