pub struct StateID(/* private fields */);
Expand description

The identifier of a finite automaton state, represented by a SmallIndex.

Most regex engines in this crate are built on top of finite automata. Each state in a finite automaton defines transitions from its state to another. Those transitions point to other states via their identifiers, i.e., a StateID. Since finite automata tend to contain many transitions, it is much more memory efficient to define state IDs as small indices.

See the SmallIndex type for more information about what it means for a state ID to be a “small index.”

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impl StateID

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pub const MAX: StateID = _

The maximum value.

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pub const LIMIT: usize = 2_147_483_647usize

The total number of values that can be represented.

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pub const ZERO: StateID = _

The zero value.

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pub const SIZE: usize = 4usize

The number of bytes that a single value uses in memory.

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pub fn new(value: usize) -> Result<StateID, StateIDError>

Create a new value that is represented by a “small index.”

If the given index exceeds the maximum allowed value, then this returns an error.

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pub const fn new_unchecked(value: usize) -> StateID

Create a new value without checking whether the given argument exceeds the maximum.

Using this routine with an invalid value will result in unspecified behavior, but not undefined behavior. In particular, an invalid ID value is likely to cause panics or possibly even silent logical errors.

Callers must never rely on this type to be within a certain range for memory safety.

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pub fn must(value: usize) -> StateID

Like new, but panics if the given value is not valid.

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pub const fn as_usize(&self) -> usize

Return the internal value as a usize. This is guaranteed to never overflow usize.

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pub const fn as_u64(&self) -> u64

Return the internal value as a u64. This is guaranteed to never overflow.

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pub const fn as_u32(&self) -> u32

Return the internal value as a u32. This is guaranteed to never overflow u32.

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pub const fn as_i32(&self) -> i32

Return the internal value as a i32. This is guaranteed to never overflow an i32`.

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pub fn one_more(&self) -> usize

Returns one more than this value as a usize.

Since values represented by a “small index” have constraints on their maximum value, adding 1 to it will always fit in a usize, u32 and a i32.

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pub fn from_ne_bytes(bytes: [u8; 4]) -> Result<StateID, StateIDError>

Decode this value from the bytes given using the native endian byte order for the current target.

If the decoded integer is not representable as a small index for the current target, then this returns an error.

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pub fn from_ne_bytes_unchecked(bytes: [u8; 4]) -> StateID

Decode this value from the bytes given using the native endian byte order for the current target.

This is analogous to new_unchecked in that is does not check whether the decoded integer is representable as a small index.

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pub fn to_ne_bytes(&self) -> [u8; 4]

Return the underlying integer as raw bytes in native endian format.

Trait Implementations§

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impl Clone for StateID

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fn clone(&self) -> StateID

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for StateID

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

Formats the value using the given formatter. Read more
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impl Default for StateID

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fn default() -> StateID

Returns the “default value” for a type. Read more
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impl From<u8> for StateID

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fn from(value: u8) -> StateID

Converts to this type from the input type.
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impl Hash for StateID

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl<T> Index<StateID> for [T]

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type Output = T

The returned type after indexing.
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fn index(&self, index: StateID) -> &T

Performs the indexing (container[index]) operation. Read more
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impl<T> Index<StateID> for Vec<T>

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type Output = T

The returned type after indexing.
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fn index(&self, index: StateID) -> &T

Performs the indexing (container[index]) operation. Read more
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impl<T> IndexMut<StateID> for [T]

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fn index_mut(&mut self, index: StateID) -> &mut T

Performs the mutable indexing (container[index]) operation. Read more
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impl<T> IndexMut<StateID> for Vec<T>

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fn index_mut(&mut self, index: StateID) -> &mut T

Performs the mutable indexing (container[index]) operation. Read more
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impl Ord for StateID

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fn cmp(&self, other: &StateID) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl PartialEq for StateID

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fn eq(&self, other: &StateID) -> bool

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

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fn partial_cmp(&self, other: &StateID) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl TryFrom<u16> for StateID

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type Error = StateIDError

The type returned in the event of a conversion error.
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fn try_from(value: u16) -> Result<StateID, StateIDError>

Performs the conversion.
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impl TryFrom<u32> for StateID

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type Error = StateIDError

The type returned in the event of a conversion error.
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fn try_from(value: u32) -> Result<StateID, StateIDError>

Performs the conversion.
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impl TryFrom<u64> for StateID

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type Error = StateIDError

The type returned in the event of a conversion error.
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fn try_from(value: u64) -> Result<StateID, StateIDError>

Performs the conversion.
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impl TryFrom<usize> for StateID

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type Error = StateIDError

The type returned in the event of a conversion error.
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fn try_from(value: usize) -> Result<StateID, StateIDError>

Performs the conversion.
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impl Copy for StateID

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impl Eq for StateID

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impl StructuralPartialEq for StateID

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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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> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.