[][src]Trait boa::environment::environment_record_trait::EnvironmentRecordTrait

pub trait EnvironmentRecordTrait: Trace + Finalize {
    fn has_binding(&self, name: &String) -> bool;
fn create_mutable_binding(&mut self, name: String, deletion: bool);
fn create_immutable_binding(&mut self, name: String, strict: bool);
fn initialize_binding(&mut self, name: String, value: Value);
fn set_mutable_binding(&mut self, name: String, value: Value, strict: bool);
fn get_binding_value(&self, name: String, strict: bool) -> Value;
fn delete_binding(&mut self, name: String) -> bool;
fn has_this_binding(&self) -> bool;
fn has_super_binding(&self) -> bool;
fn with_base_object(&self) -> Value;
fn get_outer_environment(&self) -> Option<Environment>;
fn set_outer_environment(&mut self, env: Environment);
fn get_environment_type(&self) -> EnvironmentType;
fn get_global_object(&self) -> Option<Value>; }

https://tc39.github.io/ecma262/#sec-environment-records

In the ECMAScript specification Environment Records are hierachical and have a base class with abstract methods.
In this implementation we have a trait which represents the behaviour of all EnvironmentRecord types.

Required methods

fn has_binding(&self, name: &String) -> 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(&mut self, name: String, deletion: bool)

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(&mut self, name: String, strict: bool)

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(&mut self, name: String, value: Value)

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(&mut self, name: String, value: Value, strict: bool)

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: String, strict: bool) -> Value

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(&mut self, name: String) -> 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 has_this_binding(&self) -> bool

Determine if an Environment Record establishes a this binding. Return true if it does and false if it does not.

fn has_super_binding(&self) -> bool

Determine if an Environment Record establishes a super method binding. Return true if it does and false if it does not.

fn with_base_object(&self) -> Value

If this Environment Record is associated with a with statement, return the with object. Otherwise, return undefined.

fn get_outer_environment(&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 get_global_object(&self) -> Option<Value>

Fetch global variable

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Implementors

impl EnvironmentRecordTrait for DeclerativeEnvironmentRecord[src]

impl EnvironmentRecordTrait for FunctionEnvironmentRecord[src]

impl EnvironmentRecordTrait for GlobalEnvironmentRecord[src]

impl EnvironmentRecordTrait for ObjectEnvironmentRecord[src]

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