Struct Context 

pub struct Context { /* private fields */ }

The variables and methods one evaluation sees.

Variables are plain values — scalars, lists and objects (Value::Map) — and functions are Value::Functions, registered under the name they are called by. A function is called with its arguments as f(x), or as a method with its receiver first, x.f(); a function stored inside an object is called that way through the object (step1.normalize()), which is how an injected object carries its own methods.

Implementations

impl Context

pub fn new() -> Context

pub fn set( &mut self, name: impl Into<Arc<str>>, value: impl Into<Value>, ) -> &mut Context

Bind a name, replacing whatever it held. Chainable.

pub fn get(&self, name: &str) -> Option<&Value>

pub fn contains(&self, name: &str) -> bool

pub fn remove(&mut self, name: &str) -> Option<Value>

pub fn clear(&mut self)

pub fn len(&self) -> usize

pub fn is_empty(&self) -> bool

pub fn names(&self) -> impl Iterator<Item = &str>

The bound names, in no particular order.

Trait Implementations

impl Clone for Context

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 Context

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

Formats the value using the given formatter.

impl Default for Context

fn default() -> Self

Returns the “default value” for a type.

impl<'a> FromIterator<(&'a str, Value)> for Context

fn from_iter<T: IntoIterator<Item = (&'a str, Value)>>(iter: T) -> Self

Creates a value from an iterator.