Enum Expression

pub enum Expression {
    Parentheses(Parentheses),
    Literal(Literal),
    UnaryOperation(UnaryOperation),
    BinaryOperation(BinaryOperation),
    Null,
}

An Expression

Variants

Parentheses(Parentheses)

Parentheses

Literal(Literal)

Any singular literal

UnaryOperation(UnaryOperation)

A unary operation

BinaryOperation(BinaryOperation)

A binary operation

Null

Implementations

impl Expression

pub fn is_parentheses(&self) -> bool

Returns true if this is a Expression::Parentheses, otherwise false

pub fn as_parentheses_mut(&mut self) -> Option<&mut Parentheses>

Optionally returns mutable references to the inner fields if this is a Expression::Parentheses, otherwise None

pub fn as_parentheses(&self) -> Option<&Parentheses>

Optionally returns references to the inner fields if this is a Expression::Parentheses, otherwise None

pub fn into_parentheses(self) -> Result<Parentheses, Self>

Returns the inner fields if this is a Expression::Parentheses, otherwise returns back the enum in the Err case of the result

pub fn is_literal(&self) -> bool

Returns true if this is a Expression::Literal, otherwise false

pub fn as_literal_mut(&mut self) -> Option<&mut Literal>

Optionally returns mutable references to the inner fields if this is a Expression::Literal, otherwise None

pub fn as_literal(&self) -> Option<&Literal>

Optionally returns references to the inner fields if this is a Expression::Literal, otherwise None

pub fn into_literal(self) -> Result<Literal, Self>

Returns the inner fields if this is a Expression::Literal, otherwise returns back the enum in the Err case of the result

pub fn is_unary_operation(&self) -> bool

Returns true if this is a Expression::UnaryOperation, otherwise false

pub fn as_unary_operation_mut(&mut self) -> Option<&mut UnaryOperation>

Optionally returns mutable references to the inner fields if this is a Expression::UnaryOperation, otherwise None

pub fn as_unary_operation(&self) -> Option<&UnaryOperation>

Optionally returns references to the inner fields if this is a Expression::UnaryOperation, otherwise None

pub fn into_unary_operation(self) -> Result<UnaryOperation, Self>

Returns the inner fields if this is a Expression::UnaryOperation, otherwise returns back the enum in the Err case of the result

pub fn is_binary_operation(&self) -> bool

Returns true if this is a Expression::BinaryOperation, otherwise false

pub fn as_binary_operation_mut(&mut self) -> Option<&mut BinaryOperation>

Optionally returns mutable references to the inner fields if this is a Expression::BinaryOperation, otherwise None

pub fn as_binary_operation(&self) -> Option<&BinaryOperation>

Optionally returns references to the inner fields if this is a Expression::BinaryOperation, otherwise None

pub fn into_binary_operation(self) -> Result<BinaryOperation, Self>

Returns the inner fields if this is a Expression::BinaryOperation, otherwise returns back the enum in the Err case of the result

pub fn is_null(&self) -> bool

Returns true if this is a Expression::Null, otherwise false

impl Expression

pub fn is_valid(&self) -> bool

Checks if the instance of expression is valid

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 Default for Expression

fn default() -> Expression

Returns the “default value” for a type.