regex_automata

Enum ErrorKind

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pub enum ErrorKind {
    Syntax(String),
    Unsupported(String),
    Serialize(String),
    StateIDOverflow {
        max: usize,
    },
    PremultiplyOverflow {
        max: usize,
        requested_max: usize,
    },
}
Expand description

The kind of error that occurred.

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Syntax(String)

An error that occurred while parsing a regular expression. Note that this error may be printed over multiple lines, and is generally intended to be end user readable on its own.

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Unsupported(String)

An error that occurred because an unsupported regex feature was used. The message string describes which unsupported feature was used.

The primary regex features that are unsupported are those that require look-around, such as the ^ and $ anchors and the word boundary assertion \b. These may be supported in the future.

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Serialize(String)

An error that occurred when attempting to serialize a DFA to bytes.

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StateIDOverflow

An error that occurs when constructing a DFA would require the use of a state ID that overflows the chosen state ID representation. For example, if one is using u8 for state IDs and builds a DFA with 257 states, then the last state’s ID will be 256 which cannot be represented with u8.

Typically, this error occurs in the determinization process of building a DFA (the conversion step from NFA to DFA). It can also occur when trying to build a smaller DFA from an existing one.

Fields

§max: usize

The maximum possible state ID.

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PremultiplyOverflow

An error that occurs when premultiplication of state IDs is requested, but doing so would overflow the chosen state ID representation.

When max == requested_max, then the state ID would overflow usize.

Fields

§max: usize

The maximum possible state id.

§requested_max: usize

The maximum ID required by premultiplication.

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impl Clone for ErrorKind

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fn clone(&self) -> ErrorKind

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 ErrorKind

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

Formats the value using the given formatter. Read more

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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> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. 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.