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LibJS: Virtualize access to an Object's own properties

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Object now has virtual get_own_property() and put_own_property() member
functions that can be overridden to provide custom behavior.

We use these virtuals to move Array-specific access behavior to Array.
This commit is contained in:
Andreas Kling 2020-03-21 14:37:34 +01:00
parent 2a7dbac0c5
commit 324b92fd06
Notes: sideshowbarker 2024-07-19 08:12:17 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/324b92fd061
4 changed files with 57 additions and 30 deletions
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24
Libraries/LibJS/Runtime/Array.cpp
View File

@ -59,4 +59,28 @@ void Array::visit_children(Cell::Visitor& visitor)
visitor.visit(element);
}
Optional<Value> Array::get_own_property(const String& property_name) const
{
bool ok;
i32 index = property_name.to_int(ok);
if (ok) {
if (index >= 0 && index < length())
return m_elements[index];
}
return Object::get_own_property(property_name);
}
bool Array::put_own_property(const String& property_name, Value value)
{
bool ok;
i32 index = property_name.to_int(ok);
if (ok && index >= 0) {
if (index >= length())
m_elements.resize(index + 1);
m_elements[index] = value;
return true;
}
return Object::put_own_property(property_name, value);
}
}

2
Libraries/LibJS/Runtime/Array.h
View File

@ -45,6 +45,8 @@ private:
virtual const char* class_name() const override { return "Array"; }
virtual void visit_children(Cell::Visitor&) override;
virtual bool is_array() const override { return true; }
virtual Optional<Value> get_own_property(const String& property_name) const override;
virtual bool put_own_property(const String& property_name, Value) override;
Vector<Value> m_elements;
};

54
Libraries/LibJS/Runtime/Object.cpp
View File

@ -44,54 +44,53 @@ Object::~Object()
{
}
Value Object::get(String property_name) const
Optional<Value> Object::get_own_property(const String& property_name) const
{
auto value_here = m_properties.get(property_name);
if (value_here.has_value() && value_here.value().is_object() && value_here.value().as_object()->is_native_property())
return static_cast<NativeProperty*>(value_here.value().as_object())->get(const_cast<Object*>(this));
return value_here;
}
bool Object::put_own_property(const String& property_name, Value value)
{
auto value_here = m_properties.get(property_name);
if (value_here.has_value() && value_here.value().is_object() && value_here.value().as_object()->is_native_property()) {
static_cast<NativeProperty*>(value_here.value().as_object())->set(const_cast<Object*>(this), value);
} else {
m_properties.set(property_name, value);
}
return true;
}
Value Object::get(const String& property_name) const
{
const Object* object = this;
while (object) {
if (object->is_array()) {
auto* array = static_cast<const Array*>(object);
bool ok;
i32 index = property_name.to_int(ok);
if (ok) {
if (index >= 0 && index < array->length())
return array->elements()[index];
}
}
auto value = object->m_properties.get(property_name);
if (value.has_value()) {
if (value.value().is_object() && value.value().as_object()->is_native_property())
return static_cast<const NativeProperty*>(value.value().as_object())->get(const_cast<Object*>(this));
auto value = object->get_own_property(property_name);
if (value.has_value())
return value.value();
}
object = object->prototype();
}
return js_undefined();
}
void Object::put(String property_name, Value value)
void Object::put(const String& property_name, Value value)
{
Object* object = this;
while (object) {
if (object->is_array()) {
auto* array = static_cast<Array*>(object);
bool ok;
i32 index = property_name.to_int(ok);
if (ok && index >= 0) {
if (index >= array->length())
array->elements().resize(index + 1);
array->elements()[index] = value;
}
}
auto value_here = object->m_properties.get(property_name);
if (value_here.has_value()) {
if (value_here.value().is_object() && value_here.value().as_object()->is_native_property()) {
static_cast<NativeProperty*>(value_here.value().as_object())->set(const_cast<Object*>(this), value);
return;
}
if (object->put_own_property(property_name, value))
return;
}
object = object->prototype();
}
m_properties.set(property_name, move(value));
put_own_property(property_name, value);
}
void Object::put_native_function(String property_name, AK::Function<Value(Object*, Vector<Value>)> native_function)
@ -147,5 +146,4 @@ Value Object::to_string() const
{
return js_string(heap(), String::format("[object %s]", class_name()));
}
}

7
Libraries/LibJS/Runtime/Object.h
View File

@ -40,8 +40,11 @@ public:
Object();
virtual ~Object();
Value get(String property_name) const;
void put(String property_name, Value);
Value get(const String& property_name) const;
void put(const String& property_name, Value);
virtual Optional<Value> get_own_property(const String& property_name) const;
virtual bool put_own_property(const String& property_name, Value);
void put_native_function(String property_name, AK::Function<Value(Object*, Vector<Value>)>);
void put_native_property(String property_name, AK::Function<Value(Object*)> getter, AK::Function<void(Object*, Value)> setter);