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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/bindings/core/v8/script_custom_element_definition_builder.h"
#include "third_party/blink/renderer/bindings/core/v8/exception_state.h"
#include "third_party/blink/renderer/bindings/core/v8/idl_types.h"
#include "third_party/blink/renderer/bindings/core/v8/native_value_traits_impl.h"
#include "third_party/blink/renderer/bindings/core/v8/script_custom_element_definition.h"
#include "third_party/blink/renderer/bindings/core/v8/script_value.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_binding_for_core.h"
#include "third_party/blink/renderer/core/css/css_style_sheet.h"
#include "third_party/blink/renderer/core/dom/exception_code.h"
#include "third_party/blink/renderer/platform/bindings/dom_wrapper_world.h"
#include "third_party/blink/renderer/platform/bindings/script_state.h"
#include "third_party/blink/renderer/platform/bindings/v8_binding_macros.h"
namespace blink {
ScriptCustomElementDefinitionBuilder::ScriptCustomElementDefinitionBuilder(
ScriptState* script_state,
CustomElementRegistry* registry,
CSSStyleSheet* default_style_sheet,
const ScriptValue& constructor,
ExceptionState& exception_state)
: script_state_(script_state),
registry_(registry),
default_style_sheet_(default_style_sheet),
constructor_value_(constructor.V8Value()),
exception_state_(exception_state) {}
bool ScriptCustomElementDefinitionBuilder::CheckConstructorIntrinsics() {
DCHECK(script_state_->World().IsMainWorld());
// The signature of CustomElementRegistry.define says this is a
// Function
// https://html.spec.whatwg.org/multipage/scripting.html#customelementsregistry
CHECK(constructor_value_->IsFunction());
constructor_ = constructor_value_.As<v8::Object>();
if (!constructor_->IsConstructor()) {
exception_state_.ThrowTypeError(
"constructor argument is not a constructor");
return false;
}
return true;
}
bool ScriptCustomElementDefinitionBuilder::CheckConstructorNotRegistered() {
if (!ScriptCustomElementDefinition::ForConstructor(script_state_.get(),
registry_, constructor_))
return true;
// Constructor is already registered.
exception_state_.ThrowDOMException(
kNotSupportedError,
"this constructor has already been used with this registry");
return false;
}
bool ScriptCustomElementDefinitionBuilder::ValueForName(
v8::Isolate* isolate,
v8::Local<v8::Context>& context,
const v8::TryCatch& try_catch,
const v8::Local<v8::Object>& object,
const StringView& name,
v8::Local<v8::Value>& value) const {
v8::Local<v8::String> name_string = V8AtomicString(isolate, name);
if (!object->Get(context, name_string).ToLocal(&value)) {
exception_state_.RethrowV8Exception(try_catch.Exception());
return false;
}
return script_state_->ContextIsValid();
}
bool ScriptCustomElementDefinitionBuilder::CheckPrototype() {
v8::Isolate* isolate = script_state_->GetIsolate();
v8::Local<v8::Context> context = script_state_->GetContext();
v8::TryCatch try_catch(isolate);
v8::Local<v8::Value> prototype_value;
if (!ValueForName(isolate, context, try_catch, constructor_, "prototype",
prototype_value))
return false;
if (!prototype_value->IsObject()) {
exception_state_.ThrowTypeError("constructor prototype is not an object");
return false;
}
prototype_ = prototype_value.As<v8::Object>();
// If retrieving the prototype destroyed the context, indicate that
// defining the element should not proceed.
return true;
}
bool ScriptCustomElementDefinitionBuilder::CallableForName(
v8::Isolate* isolate,
v8::Local<v8::Context>& context,
const v8::TryCatch& try_catch,
const StringView& name,
v8::Local<v8::Function>& callback) const {
v8::Local<v8::Value> value;
if (!ValueForName(isolate, context, try_catch, prototype_, name, value))
return false;
// "undefined" means "omitted", which is valid.
if (value->IsUndefined())
return true;
if (!value->IsFunction()) {
exception_state_.ThrowTypeError(String::Format(
"\"%s\" is not a callable object", name.ToString().Ascii().data()));
return false;
}
callback = value.As<v8::Function>();
return true;
}
bool ScriptCustomElementDefinitionBuilder::RetrieveObservedAttributes(
v8::Isolate* isolate,
v8::Local<v8::Context>& context,
const v8::TryCatch& try_catch) {
v8::Local<v8::Value> observed_attributes_value;
if (!ValueForName(isolate, context, try_catch, constructor_,
"observedAttributes", observed_attributes_value))
return false;
if (observed_attributes_value->IsUndefined())
return true;
Vector<String> list = NativeValueTraits<IDLSequence<IDLString>>::NativeValue(
isolate, observed_attributes_value, exception_state_);
if (exception_state_.HadException() || !script_state_->ContextIsValid())
return false;
if (list.IsEmpty())
return true;
observed_attributes_.ReserveCapacityForSize(list.size());
for (const auto& attribute : list)
observed_attributes_.insert(AtomicString(attribute));
return true;
}
bool ScriptCustomElementDefinitionBuilder::RememberOriginalProperties() {
// Spec requires to use values of these properties at the point
// CustomElementDefinition is built, even if JS changes them afterwards.
v8::Isolate* isolate = script_state_->GetIsolate();
v8::Local<v8::Context> context = script_state_->GetContext();
v8::TryCatch try_catch(isolate);
return CallableForName(isolate, context, try_catch, "connectedCallback",
connected_callback_) &&
CallableForName(isolate, context, try_catch, "disconnectedCallback",
disconnected_callback_) &&
CallableForName(isolate, context, try_catch, "adoptedCallback",
adopted_callback_) &&
CallableForName(isolate, context, try_catch,
"attributeChangedCallback",
attribute_changed_callback_) &&
(attribute_changed_callback_.IsEmpty() ||
RetrieveObservedAttributes(isolate, context, try_catch));
}
CustomElementDefinition* ScriptCustomElementDefinitionBuilder::Build(
const CustomElementDescriptor& descriptor,
CustomElementDefinition::Id id) {
return ScriptCustomElementDefinition::Create(
script_state_.get(), registry_, descriptor, id, constructor_,
connected_callback_, disconnected_callback_, adopted_callback_,
attribute_changed_callback_, std::move(observed_attributes_),
default_style_sheet_);
}
} // namespace blink
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