Enum Expression 

pub enum Expression {
    Unary {
        right: Box<Expression>,
        operator: Operator,
    },
    Binary {
        left: Box<Expression>,
        right: Box<Expression>,
        operator: Operator,
    },
    Ternary {
        left: Box<Expression>,
        middle: Box<Expression>,
        right: Box<Expression>,
        operator: Operator,
    },
    Array {
        expressions: Vec<Expression>,
    },
    Literal {
        value: Value,
    },
    Variable {
        name: String,
    },
    Call {
        name: String,
        params: Vec<Expression>,
    },
}

An Expression is a statement which can always be evaluated to a single Value. A recursive Expression is the foundation of an AST.

Variants

Unary

An unary operation on a single Expression operand using an Operator

Fields

right: Box<Expression>

operator: Operator

Binary

A binary operation on two Expression operands using an Operator.

Fields

left: Box<Expression>

right: Box<Expression>

operator: Operator

Ternary

A ternary operation on three Expression operands using an Operator.

Fields

left: Box<Expression>

middle: Box<Expression>

right: Box<Expression>

operator: Operator

Array

A list of Expression values.

Fields

expressions: Vec<Expression>

Literal

A literal Value.

Fields

value: Value

Variable

A named external variable.

Fields

name: String

Call

A call to an external function with a list of Expression parameters.

Fields

name: String

params: Vec<Expression>

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Expression

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

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 Serialize for Expression

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Expression