Enum regex_syntax::hir::Class[][src]

pub enum Class {
    Unicode(ClassUnicode),
    Bytes(ClassBytes),
}

The high-level intermediate representation of a character class.

A character class corresponds to a set of characters. A character is either defined by a Unicode scalar value or a byte. Unicode characters are used by default, while bytes are used when Unicode mode (via the u flag) is disabled.

A character class, regardless of its character type, is represented by a sequence of non-overlapping non-adjacent ranges of characters.

Note that unlike Literal, a Bytes variant may be produced even when it exclusively matches valid UTF-8. This is because a Bytes variant represents an intention by the author of the regular expression to disable Unicode mode, which in turn impacts the semantics of case insensitive matching. For example, (?i)k and (?i-u)k will not match the same set of strings.

Variants

Unicode(ClassUnicode)

A set of characters represented by Unicode scalar values.

Bytes(ClassBytes)

A set of characters represented by arbitrary bytes (one byte per character).

Implementations

impl Class[src]

pub fn case_fold_simple(&mut self)[src]

Apply Unicode simple case folding to this character class, in place. The character class will be expanded to include all simple case folded character variants.

If this is a byte oriented character class, then this will be limited to the ASCII ranges A-Z and a-z.

pub fn negate(&mut self)[src]

Negate this character class in place.

After completion, this character class will contain precisely the characters that weren’t previously in the class.

pub fn is_always_utf8(&self) -> bool[src]

Returns true if and only if this character class will only ever match valid UTF-8.

A character class can match invalid UTF-8 only when the following conditions are met:

  1. The translator was configured to permit generating an expression that can match invalid UTF-8. (By default, this is disabled.)
  2. Unicode mode (via the u flag) was disabled either in the concrete syntax or in the parser builder. By default, Unicode mode is enabled.

Trait Implementations

impl Clone for Class[src]

impl Debug for Class[src]

impl Eq for Class[src]

impl PartialEq<Class> for Class[src]

impl StructuralEq for Class[src]

impl StructuralPartialEq for Class[src]

Auto Trait Implementations

impl RefUnwindSafe for Class

impl Send for Class

impl Sync for Class

impl Unpin for Class

impl UnwindSafe for Class

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
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impl<T> Borrow<T> for T where
    T: ?Sized
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impl<T> BorrowMut<T> for T where
    T: ?Sized
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impl<T> From<T> for T[src]

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

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.

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.