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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 crate::ule::*;
use core::str;

// This is safe to implement because from_byte_slice_unchecked returns
// the same value as parse_byte_slice
unsafe impl VarULE for str {
    type Error = str::Utf8Error;

    #[inline]
    fn validate_byte_slice(bytes: &[u8]) -> Result<(), Self::Error> {
        str::from_utf8(bytes)?;
        Ok(())
    }

    #[inline]
    fn parse_byte_slice(bytes: &[u8]) -> Result<&Self, Self::Error> {
        str::from_utf8(bytes)
    }
    /// Invariant: must be safe to call when called on a slice that previously
    /// succeeded with `parse_byte_slice`
    #[inline]
    unsafe fn from_byte_slice_unchecked(bytes: &[u8]) -> &Self {
        str::from_utf8_unchecked(bytes)
    }
    #[inline]
    fn as_byte_slice(&self) -> &[u8] {
        self.as_bytes()
    }
}