Struct Environment 

pub struct Environment { /* private fields */ }

Environment for variable bindings during evaluation

Implementations

impl Environment

pub fn new() -> Self

Create a new empty environment

pub fn bind(&mut self, name: SimpleIdentifier, value: Value)

Bind a variable to a value in this environment

pub fn lookup(&self, name: &SimpleIdentifier) -> Option<&Value>

Look up a variable in this environment

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

Check if a variable exists in this environment

pub fn bindings(&self) -> &HashMap<SimpleIdentifier, Value>

Get all bindings

pub fn clear(&mut self)

Clear all bindings

pub fn unbind(&mut self, name: &SimpleIdentifier) -> Option<Value>

Remove a specific binding

pub fn len(&self) -> usize

Get the number of bindings

pub fn is_empty(&self) -> bool

Check if empty

pub fn merge(&mut self, other: Environment)

Merge another environment into this one (other environment shadows this one)

pub fn union(self, other: Environment) -> Self

Create a new environment with the union of two environments In case of conflicts, the second environment’s bindings take precedence

Trait Implementations

impl Clone for Environment

fn clone(&self) -> Environment

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Environment

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

Formats the value using the given formatter.

impl Default for Environment

fn default() -> Self

Returns the “default value” for a type.