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use crate::environment::declerative_environment_record::DeclerativeEnvironmentRecord;
use crate::environment::environment_record_trait::EnvironmentRecordTrait;
use crate::environment::lexical_environment::{Environment, EnvironmentType};
use crate::environment::object_environment_record::ObjectEnvironmentRecord;
use crate::js::value::{Value, ValueData};
use gc::Gc;
use std::collections::HashSet;
#[derive(Trace, Finalize, Clone)]
pub struct GlobalEnvironmentRecord {
pub object_record: Box<ObjectEnvironmentRecord>,
pub global_this_binding: Value,
pub declerative_record: Box<DeclerativeEnvironmentRecord>,
pub var_names: HashSet<String>,
}
impl GlobalEnvironmentRecord {
pub fn get_this_binding(&self) -> Value {
return self.global_this_binding.clone();
}
pub fn has_var_decleration(&self, name: &String) -> bool {
return self.var_names.contains(name);
}
pub fn has_lexical_decleration(&self, name: &String) -> bool {
self.declerative_record.has_binding(name)
}
pub fn has_restricted_global_property(&self, name: &String) -> bool {
let global_object = &self.object_record.bindings;
let existing_prop = global_object.get_prop(name.clone());
match existing_prop {
Some(prop) => {
if prop.value.is_undefined() || prop.configurable == true {
return false;
}
true
}
None => false,
}
}
pub fn create_global_var_binding(&mut self, name: String, deletion: bool) {
let obj_rec = &mut self.object_record;
let global_object = &obj_rec.bindings;
let has_property = global_object.has_field(name.clone());
let extensible = global_object.is_extensible();
if !has_property && extensible {
obj_rec.create_mutable_binding(name.clone(), deletion);
obj_rec.initialize_binding(name.clone(), Gc::new(ValueData::Undefined));
}
let var_declared_names = &mut self.var_names;
if !var_declared_names.contains(&name) {
var_declared_names.insert(name.clone());
}
}
pub fn create_global_function_binding(&mut self, name: String, value: Value, deletion: bool) {
let global_object = &mut self.object_record.bindings;
let existing_prop = global_object.get_prop(name.clone());
match existing_prop {
Some(prop) => {
if prop.value.is_undefined() || prop.configurable {
global_object.update_prop(
name,
Some(value),
Some(true),
Some(true),
Some(deletion),
);
}
}
None => {
global_object.update_prop(
name,
Some(value),
Some(true),
Some(true),
Some(deletion),
);
}
}
}
}
impl EnvironmentRecordTrait for GlobalEnvironmentRecord {
fn has_binding(&self, name: &String) -> bool {
if self.declerative_record.has_binding(name) {
return true;
}
self.object_record.has_binding(name)
}
fn create_mutable_binding(&mut self, name: String, deletion: bool) {
if self.declerative_record.has_binding(&name) {
panic!("Binding already exists!");
}
self.declerative_record
.create_mutable_binding(name.clone(), deletion)
}
fn create_immutable_binding(&mut self, name: String, strict: bool) {
if self.declerative_record.has_binding(&name) {
panic!("Binding already exists!");
}
self.declerative_record
.create_immutable_binding(name.clone(), strict)
}
fn initialize_binding(&mut self, name: String, value: Value) {
if self.declerative_record.has_binding(&name) {
return self
.declerative_record
.initialize_binding(name.clone(), value);
}
panic!("Should not initialized binding without creating first.");
}
fn set_mutable_binding(&mut self, name: String, value: Value, strict: bool) {
if self.declerative_record.has_binding(&name) {
return self
.declerative_record
.set_mutable_binding(name, value, strict);
}
self.object_record.set_mutable_binding(name, value, strict)
}
fn get_binding_value(&self, name: String, strict: bool) -> Value {
if self.declerative_record.has_binding(&name) {
return self.declerative_record.get_binding_value(name, strict);
}
return self.object_record.get_binding_value(name, strict);
}
fn delete_binding(&mut self, name: String) -> bool {
if self.declerative_record.has_binding(&name) {
return self.declerative_record.delete_binding(name.clone());
}
let global: &Value = &self.object_record.bindings;
if global.has_field(name.clone()) {
let status = self.object_record.delete_binding(name.clone());
if status {
let var_names = &mut self.var_names;
if var_names.contains(&name) {
var_names.remove(&name);
return status;
}
}
}
true
}
fn has_this_binding(&self) -> bool {
true
}
fn has_super_binding(&self) -> bool {
false
}
fn with_base_object(&self) -> Value {
Gc::new(ValueData::Undefined)
}
fn get_outer_environment(&self) -> Option<Environment> {
None
}
fn set_outer_environment(&mut self, _env: Environment) {
unimplemented!()
}
fn get_environment_type(&self) -> EnvironmentType {
return EnvironmentType::Global;
}
fn get_global_object(&self) -> Option<Value> {
Some(self.global_this_binding.clone())
}
}