Enum TokenKind

pub enum TokenKind {
    Number,
    Variable,
    Operator,
    Open,
    Close,
    Separator,
    End,
    Error,
    Null,
}

Classifies the kind of token produced during lexical analysis.

These token types are used by the lexer to categorize different elements in the expression string during the parsing phase.

Variants

Number

A numerical literal.

Variable

A variable identifier.

Operator

An operator such as +, -, *, /, ^, etc.

Open

An opening delimiter like ‘(’ or ‘[’.

Close

A closing delimiter like ‘)’ or ‘]’.

Separator

A separator between items, typically a comma.

End

End of the expression.

Error

An error token representing invalid input.

Null

A null or placeholder token.

Trait Implementations

impl Clone for TokenKind

fn clone(&self) -> TokenKind

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TokenKind

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

Formats the value using the given formatter.

impl PartialEq for TokenKind

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

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for TokenKind

impl Eq for TokenKind

impl StructuralPartialEq for TokenKind