Struct FunctionEnvironmentRecord 

pub struct FunctionEnvironmentRecord {
    pub declarative_record: DeclarativeEnvironmentRecord,
    pub this_value: JsValue,
    pub this_binding_status: BindingStatus,
    pub function: JsObject,
    pub home_object: JsValue,
    pub new_target: JsValue,
}

https://tc39.es/ecma262/#table-16

Fields

declarative_record: DeclarativeEnvironmentRecord

this_value: JsValue

This is the this value used for this invocation of the function.

this_binding_status: BindingStatus

If the value is “lexical”, this is an ArrowFunction and does not have a local this value.

function: JsObject

The function object whose invocation caused this Environment Record to be created.

home_object: JsValue

If the associated function has super property accesses and is not an ArrowFunction, [[HomeObject]] is the object that the function is bound to as a method. The default value for [[HomeObject]] is undefined.

new_target: JsValue

If this Environment Record was created by the [[Construct]] internal method, [[NewTarget]] is the value of the [[Construct]] newTarget parameter. Otherwise, its value is undefined.

Implementations

impl FunctionEnvironmentRecord

pub fn new( f: JsObject, this: Option<JsValue>, outer: Option<Environment>, binding_status: BindingStatus, new_target: JsValue, context: &mut Context, ) -> JsResult<FunctionEnvironmentRecord>

pub fn bind_this_value( &mut self, value: JsValue, context: &mut Context, ) -> JsResult<JsValue>

9.1.1.3.1 BindThisValue ( V )

More information:

• ECMAScript reference

pub fn get_super_base(&self) -> JsValue

9.1.1.3.5 GetSuperBase ( )

More information:

• ECMAScript reference

Trait Implementations

impl Clone for FunctionEnvironmentRecord

fn clone(&self) -> FunctionEnvironmentRecord

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FunctionEnvironmentRecord

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

Formats the value using the given formatter.

impl Drop for FunctionEnvironmentRecord

fn drop(&mut self)

Executes the destructor for this type.

impl EnvironmentRecordTrait for FunctionEnvironmentRecord

fn has_this_binding(&self) -> bool

9.1.1.3.2 HasThisBinding ( )

More information:

• ECMAScript reference

fn has_super_binding(&self) -> bool

9.1.1.3.3 HasSuperBinding ( )

More information:

• ECMAScript reference

fn get_this_binding(&self, context: &mut Context) -> JsResult<JsValue>

9.1.1.3.4 GetThisBinding ( )

More information:

• ECMAScript reference

fn has_binding(&self, name: &str, context: &mut Context) -> JsResult<bool>

Determine if an Environment Record has a binding for the String value N. Return true if it does and false if it does not.

fn create_mutable_binding( &self, name: &str, deletion: bool, allow_name_reuse: bool, context: &mut Context, ) -> JsResult<()>

Create a new but uninitialized mutable binding in an Environment Record. The String value N is the text of the bound name. If the Boolean argument deletion is true the binding may be subsequently deleted.

fn create_immutable_binding( &self, name: &str, strict: bool, context: &mut Context, ) -> JsResult<()>

Create a new but uninitialized immutable binding in an Environment Record. The String value N is the text of the bound name. If strict is true then attempts to set it after it has been initialized will always throw an exception, regardless of the strict mode setting of operations that reference that binding.

fn initialize_binding( &self, name: &str, value: JsValue, context: &mut Context, ) -> JsResult<()>

Set the value of an already existing but uninitialized binding in an Environment Record. The String value N is the text of the bound name. V is the value for the binding and is a value of any ECMAScript language type.

fn set_mutable_binding( &self, name: &str, value: JsValue, strict: bool, context: &mut Context, ) -> JsResult<()>

Set the value of an already existing mutable binding in an Environment Record. The String value name is the text of the bound name. value is the value for the binding and may be a value of any ECMAScript language type. S is a Boolean flag. If strict is true and the binding cannot be set throw a TypeError exception.

fn get_binding_value( &self, name: &str, strict: bool, context: &mut Context, ) -> JsResult<JsValue>

Returns the value of an already existing binding from an Environment Record. The String value N is the text of the bound name. S is used to identify references originating in strict mode code or that otherwise require strict mode reference semantics.

fn delete_binding(&self, name: &str, context: &mut Context) -> JsResult<bool>

Delete a binding from an Environment Record. The String value name is the text of the bound name. If a binding for name exists, remove the binding and return true. If the binding exists but cannot be removed return false. If the binding does not exist return true.

fn with_base_object(&self) -> Option<JsObject>

If this Environment Record is associated with a with statement, return the with object. Otherwise, return None.

fn get_outer_environment_ref(&self) -> Option<&Environment>

Get the next environment up

fn set_outer_environment(&mut self, env: Environment)

Set the next environment up

fn get_environment_type(&self) -> EnvironmentType

Get the type of environment this is

fn recursive_create_mutable_binding( &self, name: &str, deletion: bool, _scope: VariableScope, context: &mut Context, ) -> JsResult<()>

Create mutable binding while handling outer environments

fn recursive_create_immutable_binding( &self, name: &str, deletion: bool, _scope: VariableScope, context: &mut Context, ) -> JsResult<()>

Create immutable binding while handling outer environments

fn get_outer_environment(&self) -> Option<Environment>

fn recursive_get_this_binding(&self, context: &mut Context) -> JsResult<JsValue>

Return the this binding from the environment or try to get it from outer environments

fn recursive_set_mutable_binding( &self, name: &str, value: JsValue, strict: bool, context: &mut Context, ) -> JsResult<()>

Set mutable binding while handling outer environments

fn recursive_initialize_binding( &self, name: &str, value: JsValue, context: &mut Context, ) -> JsResult<()>

Initialize binding while handling outer environments

fn recursive_has_binding( &self, name: &str, context: &mut Context, ) -> JsResult<bool>

Check if a binding exists in current or any outer environment

fn recursive_get_binding_value( &self, name: &str, context: &mut Context, ) -> JsResult<JsValue>

Retrieve binding from current or any outer environment

impl Finalize for FunctionEnvironmentRecord

fn finalize(&self)

impl From<FunctionEnvironmentRecord> for Environment

fn from(env: FunctionEnvironmentRecord) -> Environment

Converts to this type from the input type.

impl Trace for FunctionEnvironmentRecord

unsafe fn trace(&self)

Marks all contained Gcs.

unsafe fn root(&self)

Increments the root-count of all contained Gcs.

unsafe fn unroot(&self)

Decrements the root-count of all contained Gcs.

fn finalize_glue(&self)

Runs Finalize::finalize() on this object and all contained subobjects