devela::text

Struct Char

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pub struct Char;
Expand description

🌐 Unicode scalars-related operations.

See also Str, ExtMem,

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impl Char

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pub const fn byte_len(code: u32) -> usize

Returns the number of bytes necessary to store the given unicode scalar code.

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pub const fn is_7bit(code: u32) -> bool

Returns true if the given unicode scalar code is a 7bit ASCII code.

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pub const fn is_noncharacter(code: u32) -> bool

Returns true if the given unicode scalar code is a noncharacter.

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pub const fn utf8_len(first_byte: u8) -> u8

Returns the expected UTF-8 byte length based on the first byte.

This function does not validate UTF-8 but determines how many bytes a valid sequence should occupy based on the leading byte.

  • ASCII (0xxxxxxx) → 1 byte
  • 2-byte (110xxxxx) → 2 bytes
  • 3-byte (1110xxxx) → 3 bytes
  • 4-byte (11110xxx) → 4 bytes
§Caveat
  • If used on malformed UTF-8, it may suggest a length longer than the actual valid sequence.
  • Always use in conjunction with proper UTF-8 validation if handling untrusted input.

For a stricter check, see utf8_len_checked.

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pub const fn utf8_len_checked(first_byte: u8) -> Option<u8> ⓘ

Returns the UTF-8 byte length or None if the first byte is invalid.

This function detects invalid UTF-8 leading bytes and ensures they fall within valid Unicode scalar boundaries.

  • Returns Some(len) for valid leading bytes.
  • Returns None for invalid first bytes that cannot start a UTF-8 sequence.
§Stricter Handling
  • Rejects overlong sequences (C0, C1).
  • Enforces the valid UTF-8 upper bound (max F4).
  • Safer for processing untrusted input where malformed UTF-8 must be detected.

For a simpler length-only function, see utf8_len.

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pub const fn utf8_2bytes_len(code: [u8; 2]) -> u8

👎Deprecated since 0.23.0: Use utf8_len instead

Returns the number of bytes needed to store the given unicode scalar code, already UTF-8 encoded in 2 bytes.

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pub const fn utf8_3bytes_len(code: [u8; 3]) -> u8

👎Deprecated since 0.23.0: Use utf8_len instead

Returns the number of bytes needed to store the given unicode scalar code, already UTF-8 encoded in 3 bytes.

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pub const fn utf8_4bytes_len(code: [u8; 4]) -> u8

👎Deprecated since 0.23.0: Use utf8_len instead

Returns the number of bytes needed to store the given unicode scalar code, already UTF-8 encoded in 4 bytes.

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pub const fn len_utf8(code: char) -> usize

Returns the number of bytes needed to encode the given unicode scalar code as UTF-8.

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pub const fn len_to_utf8(code: char) -> usize

👎Deprecated since 0.23.0: Use len_utf8 instead

Returns the number of bytes needed to encode the given unicode scalar code as UTF-8.

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pub const fn to_utf8_bytes(c: char) -> [u8; 4]

Converts this char to an UTF-8 encoded sequence of bytes.

Note that this function always returns a 4-byte array, but the actual UTF-8 sequence may be shorter. The unused bytes are set to 0.

See also char::encode_utf8.

Auto Trait Implementations§

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impl Freeze for Char

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impl RefUnwindSafe for Char

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impl Send for Char

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impl Sync for Char

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impl Unpin for Char

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impl UnwindSafe for Char

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impl<T> Any for T
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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> ByteSized for T

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const BYTE_ALIGN: usize = _

The alignment of this type in bytes.
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const BYTE_SIZE: usize = _

The size of this type in bytes.
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fn byte_align(&self) -> usize

Returns the alignment of this type in bytes.
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fn byte_size(&self) -> usize

Returns the size of this type in bytes. Read more
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fn ptr_size_ratio(&self) -> [usize; 2]

Returns the size ratio between Ptr::BYTES and BYTE_SIZE. Read more
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impl<T, R> Chain<R> for T
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fn chain<F>(self, f: F) -> R
where F: FnOnce(Self) -> R, Self: Sized,

Chain a function which takes the parameter by value.
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fn chain_ref<F>(&self, f: F) -> R
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Chain a function which takes the parameter by shared reference.
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where F: FnOnce(&mut Self) -> R,

Chain a function which takes the parameter by exclusive reference.
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Returns the TypeId of Self. Read more
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Returns the type name of self. Read more
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Returns a deterministic hash of the TypeId of Self.
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fn downcast_ref<T: 'static>(&self) -> Option<&T> ⓘ

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impl<T> ExtMem for T
where T: ?Sized,

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const NEEDS_DROP: bool = _

Know whether dropping values of this type matters, in compile-time.
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fn mem_align_of<T>() -> usize

Returns the minimum alignment of the type in bytes. Read more
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fn mem_align_of_val(&self) -> usize

Returns the alignment of the pointed-to value in bytes. Read more
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fn mem_size_of<T>() -> usize

Returns the size of a type in bytes. Read more
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fn mem_size_of_val(&self) -> usize

Returns the size of the pointed-to value in bytes. Read more
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fn mem_copy(&self) -> Self
where Self: Copy,

Bitwise-copies a value. Read more
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fn mem_needs_drop(&self) -> bool

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fn mem_drop(self)
where Self: Sized,

Drops self by running its destructor. Read more
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fn mem_swap(&mut self, other: &mut Self)
where Self: Sized,

Swaps the value of self and other without deinitializing either one. Read more
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unsafe fn mem_zeroed<T>() -> T

Available on crate feature unsafe_layout only.
Returns the value of type T represented by the all-zero byte-pattern. Read more
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unsafe fn mem_transmute_copy<Src, Dst>(src: &Src) -> Dst

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Returns the value of type T represented by the all-zero byte-pattern. Read more
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fn mem_as_bytes(&self) -> &[u8] ⓘ
where Self: Sync + Unpin,

Available on crate feature unsafe_slice only.
View a Sync + Unpin self as &[u8]. Read more
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fn mem_as_bytes_mut(&mut self) -> &mut [u8] ⓘ
where Self: Sync + Unpin,

Available on crate feature unsafe_slice only.
View a Sync + Unpin self as &mut [u8]. Read more
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fn from(t: T) -> T

Returns the argument unchanged.

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Applies a function which takes the parameter by exclusive reference, and then returns the (possibly) modified owned value. Read more
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fn into(self) -> U

Calls U::from(self).

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const ALIGN: usize

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

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Dereferences the given pointer. Read more
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