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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| // 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 ). | ||
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| use crate::{impl_display_with_writeable, LengthHint, Writeable}; | ||
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| use core::fmt; | ||
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| /// Implements [`Writeable`] for [`&[u8]`] according to the [WHATWG Encoding Standard]( | ||
| /// https://encoding.spec.whatwg.org/#utf-8-decoder). | ||
| #[derive(Debug)] | ||
| pub struct PotentiallyInvalidUtf8<'a>(pub &'a [u8]); | ||
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| impl Writeable for PotentiallyInvalidUtf8<'_> { | ||
| fn write_to<W: core::fmt::Write + ?Sized>(&self, sink: &mut W) -> fmt::Result { | ||
| let mut remaining = self.0; | ||
| while remaining.len() > 0 { | ||
| match core::str::from_utf8(remaining) { | ||
| Ok(str) => { | ||
| return sink.write_str(str); | ||
| } | ||
| Err(e) => { | ||
| let (str, r) = remaining.split_at(e.valid_up_to()); | ||
| sink.write_str(unsafe { core::str::from_utf8_unchecked(str) })?; | ||
| sink.write_char(char::REPLACEMENT_CHARACTER)?; | ||
| match e.error_len() { | ||
| None => remaining = &[], | ||
| Some(l) => remaining = &r[l..], | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| Ok(()) | ||
| } | ||
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| fn writeable_length_hint(&self) -> crate::LengthHint { | ||
| // In the worst case, every byte becomes a replacement character | ||
| LengthHint::at_most(self.0.len() * 3) | ||
| } | ||
| } | ||
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| impl_display_with_writeable!(PotentiallyInvalidUtf8<'_>); | ||
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| /// Implements [`Writeable`] for [`&[u16]`] according to the [WHATWG Encoding Standard]( | ||
| /// https://encoding.spec.whatwg.org/#shared-utf-16-decoder). | ||
| #[derive(Debug)] | ||
| pub struct PotentiallyInvalidUtf16<'a>(pub &'a [u16]); | ||
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| impl Writeable for PotentiallyInvalidUtf16<'_> { | ||
| fn write_to<W: fmt::Write + ?Sized>(&self, sink: &mut W) -> fmt::Result { | ||
| for c in core::char::decode_utf16(self.0.iter().copied()) { | ||
| if let Ok(c) = c { | ||
| sink.write_char(c)?; | ||
| } else { | ||
| sink.write_char(char::REPLACEMENT_CHARACTER)?; | ||
| } | ||
| } | ||
| Ok(()) | ||
| } | ||
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| fn writeable_length_hint(&self) -> LengthHint { | ||
| LengthHint::undefined() // todo | ||
| } | ||
| } | ||
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| impl_display_with_writeable!(PotentiallyInvalidUtf16<'_>); | ||
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| #[cfg(test)] | ||
| mod test { | ||
| use super::*; | ||
| use crate::assert_writeable_eq; | ||
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| #[test] | ||
| fn test_utf8() { | ||
| assert_writeable_eq!(PotentiallyInvalidUtf8(b"Foo Bar"), "Foo Bar"); | ||
| assert_writeable_eq!(PotentiallyInvalidUtf8(b"Foo\xFDBar"), "Foo�Bar"); | ||
| } | ||
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| #[test] | ||
| fn test_utf16() { | ||
| assert_writeable_eq!(PotentiallyInvalidUtf16(&[0xD83E, 0xDD73]), "🥳"); | ||
| assert_writeable_eq!(PotentiallyInvalidUtf16(&[0xD83E, 0x20, 0xDD73]), "� �"); | ||
| } | ||
| } |