Enum sparser::Value

pub enum Value {
    List(Cons),
    Symbol(String),
    Number(usize),
    Bool(bool),
    Literal(String),
    Null,
}

Value represents all the things that are elements of the list expression

Variants

List(Cons)

A linked list

Symbol(String)

Symbol, eg. (if this than that), the word "if" is a symbol as well as "this", "than" and "that"

Number(usize)

A number

Bool(bool)

A boolean (true or false)

Literal(String)

A literal which is not futher parsed

Null

The end of a linked list

Methods

impl Value

fn car(self) -> Box<Value>

Gives the head of the list if value is a list

fn cdr(self) -> Box<Value>

Gives the tail of the list if value is a list

fn is_symbol(&self) -> bool

Gives true if the current value is a symbol false if not

fn is_number(&self) -> bool

Gives true if the current value is a number false if not

fn is_true(&self) -> bool

If the current value is a boolean, gives the value of that boolean otherwise false is returned

fn is_false(&self) -> bool

Oposite of is_true()

fn unwrap_symbol(self) -> String

Gives the symbol stored in the Value container

fn unwrap_number(self) -> usize

Gives the number stored in the Value container

fn unwrap_literal(self) -> String

Gives the literal contained in Value

Trait Implementations

impl Debug for Value

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.