Struct Environment 

pub struct Environment { /* private fields */ }

Variable environment for scoping

Implementations

impl Environment

pub fn new() -> Self

Creates a new empty environment

pub fn with_parent(parent: Environment) -> Self

Creates a new child environment

pub fn define(&mut self, name: String, value: Value)

Defines a variable in the current scope

pub fn lookup(&self, name: &str) -> Result<&Value>

Looks up a variable in this scope or parent scopes

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

Checks if a variable is defined

pub fn update(&mut self, name: &str, value: Value) -> Result<()>

Updates a variable in the current scope or parent scopes

pub fn variables(&self) -> Vec<String>

Gets all variable names in this scope

pub fn len(&self) -> usize

Gets the number of bindings in this scope (not including parents)

pub fn is_empty(&self) -> bool

Checks if this environment is empty

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

Merges another environment into this one

pub fn snapshot(&self) -> HashMap<String, Value>

Creates a snapshot of all bindings (flattened)

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.