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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 std::error::Error;
use std::fmt::{self, Display};

/// List of parser errors that can be generated
/// while parsing [`LanguageIdentifier`](crate::LanguageIdentifier), [`Locale`](crate::Locale),
/// [`subtags`](crate::subtags) or [`extensions`](crate::extensions).
#[derive(Debug, PartialEq)]
pub enum ParserError {
    /// Invalid language subtag.
    ///
    /// # Examples
    ///
    /// ```
    /// use std::str::FromStr;
    ///
    /// use icu::locid::subtags::Language;
    /// use icu::locid::ParserError;
    ///
    /// assert_eq!(Language::from_str("x2"), Err(ParserError::InvalidLanguage));
    /// ```
    InvalidLanguage,

    /// Invalid script, region or variant subtag.
    ///
    /// # Examples
    ///
    /// ```
    /// use std::str::FromStr;
    ///
    /// use icu::locid::subtags::Region;
    /// use icu::locid::ParserError;
    ///
    /// assert_eq!(Region::from_str("#@2X"), Err(ParserError::InvalidSubtag));
    /// ```
    InvalidSubtag,

    /// Invalid extension subtag.
    ///
    /// # Examples
    ///
    /// ```
    /// use std::str::FromStr;
    ///
    /// use icu::locid::extensions::unicode::Key;
    /// use icu::locid::ParserError;
    ///
    /// assert_eq!(Key::from_str("#@2X"), Err(ParserError::InvalidExtension));
    /// ```
    InvalidExtension,
}

impl Error for ParserError {}

impl Display for ParserError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        let value = match self {
            Self::InvalidLanguage => "The given language subtag is invalid",
            Self::InvalidSubtag => "Invalid subtag",
            Self::InvalidExtension => "Invalid extension",
        };
        f.write_str(value)
    }
}