Enum Expression 

pub enum Expression {
    Null,
    Boolean(bool),
    String(String),
    Number(Decimal),
    Identifier(String),
    List(Vec<Spanned<Expression>>),
    Object(Vec<(Spanned<String>, Spanned<Expression>)>),
    Function {
        args: Vec<Spanned<String>>,
        body: Box<Spanned<Expression>>,
    },
    Unary {
        right: Box<Spanned<Expression>>,
        operator: UnaryOperator,
    },
    Binary {
        left: Box<Spanned<Expression>>,
        right: Box<Spanned<Expression>>,
        operator: BinaryOperator,
    },
    Call {
        function: Box<Spanned<Expression>>,
        args: Vec<Spanned<Expression>>,
    },
    GetIndex {
        container: Box<Spanned<Expression>>,
        index: Box<Spanned<Expression>>,
    },
    GetKey {
        container: Box<Spanned<Expression>>,
        key: Spanned<String>,
    },
    GetSlice {
        container: Box<Spanned<Expression>>,
        start: Option<Box<Spanned<Expression>>>,
        end: Option<Box<Spanned<Expression>>>,
    },
    Error,
}

An expression represents an entity which can be evaluated to a value.

Variants

Null

Literal null.

Boolean(bool)

Literal boolean.

String(String)

Literal string.

Number(Decimal)

Literal number.

Identifier(String)

A named local variable.

List(Vec<Spanned<Expression>>)

Literal list.

Object(Vec<(Spanned<String>, Spanned<Expression>)>)

Literal key-value object.

Function

Function

Fields

args: Vec<Spanned<String>>

body: Box<Spanned<Expression>>

Unary

An operation on a single Expression operand with an [Operator]

Fields

right: Box<Spanned<Expression>>

operator: UnaryOperator

Binary

An operation on two Expression operands with a an [Operator].

Fields

left: Box<Spanned<Expression>>

right: Box<Spanned<Expression>>

operator: BinaryOperator

Call

A function invocation with a list of Expression parameters.

Fields

function: Box<Spanned<Expression>>

args: Vec<Spanned<Expression>>

GetIndex

Get index operation (a[x]).

Fields

container: Box<Spanned<Expression>>

index: Box<Spanned<Expression>>

GetKey

Get key operation (c.z).

Fields

container: Box<Spanned<Expression>>

key: Spanned<String>

GetSlice

Slice operation (b[x:y]).

Fields

container: Box<Spanned<Expression>>

start: Option<Box<Spanned<Expression>>>

end: Option<Box<Spanned<Expression>>>

Error

Trait Implementations

impl Clone for Expression

fn clone(&self) -> Expression

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Expression

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

Formats the value using the given formatter.

impl Display for Expression

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

Formats the value using the given formatter.

impl Hash for Expression

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Expression

fn cmp(&self, other: &Expression) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Expression

fn eq(&self, other: &Expression) -> 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 PartialOrd for Expression

fn partial_cmp(&self, other: &Expression) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Eq for Expression

impl StructuralPartialEq for Expression