Enum regex_syntax::ast::parse::ClassState

enum ClassState {
    Open {
        union: ClassSetUnion,
        set: ClassBracketed,
    },
    Op {
        kind: ClassSetBinaryOpKind,
        lhs: ClassSet,
    },
}

ClassState represents a single stack frame while parsing character classes. Each frame records the state up to an intersection, difference, symmetric difference or nested class.

Note that a parser’s character class stack is only non-empty when parsing a character class. In all other cases, it is empty.

Variants

Open

This state is pushed whenever an opening bracket is found.

Fields

union: ClassSetUnion

The union of class items immediately preceding this class.

set: ClassBracketed

The class that has been opened. Typically this just corresponds to the [, but it can also include [^ since ^ indicates negation of the class.

Op

This state is pushed when a operator is seen. When popped, the stored set becomes the left hand side of the operator.

Fields

kind: ClassSetBinaryOpKind

The type of the operation, i.e., &&, – or ~~.

lhs: ClassSet

The left-hand side of the operator.

Trait Implementations

impl Clone for ClassState

fn clone(&self) -> ClassState

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ClassState

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

Formats the value using the given formatter.