Enum Expression 

#[non_exhaustive]
pub enum Expression<'a> {
    Literal(LiteralExpression<'a>),
    Variable(VariableExpression<'a>),
    Function(FunctionExpression<'a>),
}

An expression: an operand with an optional function, or a function alone.

Not exhaustive: the spec says future versions may add expression shapes.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Literal(LiteralExpression<'a>)

{|literal| :fn …} or {literal}.

Variable(VariableExpression<'a>)

{$var :fn …} or {$var}.

Function(FunctionExpression<'a>)

{:fn …}.

Implementations

impl<'a> Expression<'a>

pub fn function(&self) -> Option<&FunctionRef<'a>>

The function, if the expression has one.

pub fn attributes(&self) -> &Attributes<'a>

The expression’s attributes.

pub fn into_owned(self) -> Expression<'static>

The same expression with every string owned.

Trait Implementations

impl<'a> Clone for Expression<'a>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for Expression<'a>

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

Formats the value using the given formatter.

impl<'de: 'a, 'a> Deserialize<'de> for Expression<'a>

Available on crate feature serde only.

fn deserialize<D: Deserializer<'de>>(d: D) -> Result<Self, D::Error>

Deserialize this value from the given Serde deserializer.

impl<'a> Eq for Expression<'a>

impl<'a> Hash for Expression<'a>

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

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<'a> PartialEq for Expression<'a>

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for Expression<'_>

Available on crate feature serde only.

fn serialize<S: Serializer>(&self, s: S) -> Result<S::Ok, S::Error>

Serialize this value into the given Serde serializer.

impl<'a> StructuralPartialEq for Expression<'a>