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

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

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.

Negate this character class in place.

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

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

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

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

This method tests for !=.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

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

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

🔬 This is a nightly-only experimental API. (toowned_clone_into)

Uses borrowed data to replace owned data, usually by cloning. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.