Enum Expression

pub enum Expression {
    Symbol(String),
    Number(f64),
    Bool(bool),
    String(String),
    List(Vec<Expression>),
    Func(Rc<dyn Fn(&[Expression]) -> LispResult>),
    Lambda(Lambda),
    Dish(Rc<RefCell<Dish>>),
}

Every expression in the embedded lisp is a variant of this enumeration:

• Symbol - a raw symbol
• Number - a floating point number
• Bool - a boolean value (true and false)
• String - a string
• List - a list of expressions
• Func - a pointer to a function object
• Lambda - an expression with a set of captured variables
• Dish - a pointer to a mutable Dish object

Variants

Symbol(String)

Number(f64)

Bool(bool)

String(String)

List(Vec<Expression>)

Func(Rc<dyn Fn(&[Expression]) -> LispResult>)

Lambda(Lambda)

Dish(Rc<RefCell<Dish>>)

Trait Implementations

impl Clone for Expression

fn clone(&self) -> Expression

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Display for Expression

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

Formats the value using the given formatter.

impl PartialEq for Expression

fn eq(&self, other: &Self) -> 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.