Struct wasmtime_environ::__core::str::Utf8Chunk

pub struct Utf8Chunk<'a> { /* private fields */ }

An item returned by the Utf8Chunks iterator.

A Utf8Chunk stores a sequence of u8 up to the first broken character when decoding a UTF-8 string.

Examples

// An invalid UTF-8 string
let bytes = b"foo\xF1\x80bar";

// Decode the first `Utf8Chunk`
let chunk = bytes.utf8_chunks().next().unwrap();

// The first three characters are valid UTF-8
assert_eq!("foo", chunk.valid());

// The fourth character is broken
assert_eq!(b"\xF1\x80", chunk.invalid());

Implementations

impl<'a> Utf8Chunk<'a>

pub fn valid(&self) -> &'a str

Returns the next validated UTF-8 substring.

This substring can be empty at the start of the string or between broken UTF-8 characters.

pub fn invalid(&self) -> &'a [u8]

Returns the invalid sequence that caused a failure.

The returned slice will have a maximum length of 3 and starts after the substring given by valid. Decoding will resume after this sequence.

If empty, this is the last chunk in the string. If non-empty, an unexpected byte was encountered or the end of the input was reached unexpectedly.

Lossy decoding would replace this sequence with U+FFFD REPLACEMENT CHARACTER.

Trait Implementations

impl<'a> Clone for Utf8Chunk<'a>

fn clone(&self) -> Utf8Chunk<'a>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Debug for Utf8Chunk<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<'a> PartialEq for Utf8Chunk<'a>

fn eq(&self, other: &Utf8Chunk<'a>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'a> Eq for Utf8Chunk<'a>

impl<'a> StructuralPartialEq for Utf8Chunk<'a>