Enum Expr 

pub enum Expr {
    Path(String),
    Str(String),
    Number(f64),
    Bool(bool),
    Null,
    Not(Box<Expr>),
    Binary {
        op: BinaryOp,
        left: Box<Expr>,
        right: Box<Expr>,
    },
}

A parsed expression.

Variants

Path(String)

A dotted lookup into the render data: user.name, items.0.title.

Str(String)

Number(f64)

Bool(bool)

Null

Not(Box<Expr>)

Binary

Fields

op: BinaryOp

left: Box<Expr>

right: Box<Expr>

Implementations

impl Expr

pub fn eval(&self, scope: &Scope<'_>) -> Json

Evaluate against the current scope.

A path that resolves to nothing yields Json::Null rather than an error. Rendering is the last step of a request: a typo in a view should leave a hole in the page, not turn a working page into a 500.

Trait Implementations

impl Clone for Expr

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Expr

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

Formats the value using the given formatter.

impl PartialEq for Expr

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Expr