Struct Scope 

pub struct Scope { /* private fields */ }

A scope maps bound identifiers to their binding positions.

It can be either a global scope or a function scope or a declarative scope.

Implementations

impl Scope

pub fn new_global() -> Scope

Creates a new global scope.

pub fn new(parent: Scope, function: bool) -> Scope

Creates a new scope.

pub fn all_bindings_local(&self) -> bool

Checks if the scope has only local bindings.

pub fn escape_all_bindings(&self)

Marks all bindings in this scope as escaping.

pub fn escaped_this(&self) -> bool

Has this binding escaped.

pub fn has_lex_binding(&self, name: &JsString) -> bool

Check if the scope has a lexical binding with the given name.

pub fn has_binding(&self, name: &JsString) -> bool

Check if the scope has a binding with the given name.

pub fn get_identifier_reference(&self, name: JsString) -> IdentifierReference

Get the binding locator for a binding with the given name. Fall back to the global scope if the binding is not found.

pub fn num_bindings(&self) -> u32

Returns the number of bindings in this scope.

pub fn num_bindings_non_local(&self) -> u32

Returns the number of bindings in this scope that are not local.

pub fn scope_index(&self) -> u32

Returns the index of this scope.

pub fn is_function(&self) -> bool

Check if the scope is a function scope.

pub fn is_global(&self) -> bool

Check if the scope is a global scope.

pub fn get_binding(&self, name: &JsString) -> Option<BindingLocator>

Get the locator for a binding name.

pub fn get_binding_reference( &self, name: &JsString, ) -> Option<IdentifierReference>

Get the locator for a binding name.

pub fn access_binding(&self, name: &JsString, eval_or_with: bool)

Simulate a binding access.

• If the binding access crosses a function border, the binding is marked as escaping.
• If the binding access is in an eval or with scope, the binding is marked as escaping.

pub fn escape_this_in_enclosing_function_scope(&self)

Escape enclosing function environment’s this.

pub fn create_mutable_binding( &self, name: JsString, function_scope: bool, ) -> BindingLocator

Creates a mutable binding.

pub fn set_mutable_binding( &self, name: JsString, ) -> Result<IdentifierReference, BindingLocatorError>

Return the binding locator for a mutable binding.

Errors

Returns an error if the binding is not mutable or does not exist.

pub fn set_mutable_binding_var( &self, name: JsString, ) -> Result<IdentifierReference, BindingLocatorError>

Return the binding locator for a set operation on an existing var binding.

Errors

Returns an error if the binding is not mutable or does not exist.

pub fn outer(&self) -> Option<Scope>

Gets the outer scope of this scope.

Trait Implementations

impl Clone for Scope

fn clone(&self) -> Scope

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Scope

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

Formats the value using the given formatter.

impl Default for Scope

fn default() -> Scope

Returns the “default value” for a type.

impl PartialEq for Scope

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for Scope