Enum TokenType

pub enum TokenType {
    Empty,
    Subgoal,
    Comma,
    Semicolon,
    LParen,
    RParen,
    Group,
    And,
    Or,
    Complex,
    LinkedList,
}

Identifies tokens in the token tree and on the parse stack.

Variants

Empty

Represents an empty parse stack.

Subgoal

Any subgoal, such as $NP = [$H | $T].

Comma

Semicolon

LParen

Left parenthesis

RParen

Right parenthesis

Group

Groups goals between parentheses: (goal1, goal2, goal3)

And

Conjunction - goal and goal

Or

Disjunction - goal or goal

Complex

Complex term on the parse stack.

LinkedList

List on the parse stack.

Trait Implementations

impl Clone for TokenType

fn clone(&self) -> TokenType

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TokenType

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

Formats the value using the given formatter.

impl Display for TokenType

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

Formats the value using the given formatter.

impl PartialEq for TokenType

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

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

const 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 TokenType

impl StructuralPartialEq for TokenType