third_party/blink/renderer/platform/bindings/v8_binding.cc

/*
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 * modification, are permitted provided that the following conditions are
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 *
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 * in the documentation and/or other materials provided with the
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#include "third_party/blink/renderer/platform/bindings/v8_binding.h"

#include "third_party/blink/renderer/platform/bindings/script_state.h"
#include "third_party/blink/renderer/platform/bindings/v8_throw_exception.h"

namespace blink {

v8::Local<v8::Function> GetBoundFunction(v8::Local<v8::Function> function) {
  v8::Local<v8::Value> bound_function = function->GetBoundFunction();
  return bound_function->IsFunction()
             ? v8::Local<v8::Function>::Cast(bound_function)
             : function;
}

v8::Local<v8::Value> FreezeV8Object(v8::Local<v8::Value> value,
                                    v8::Isolate* isolate) {
  value.As<v8::Object>()
      ->SetIntegrityLevel(isolate->GetCurrentContext(),
                          v8::IntegrityLevel::kFrozen)
      .ToChecked();
  return value;
}

namespace bindings {

void V8ObjectToPropertyDescriptor(v8::Isolate* isolate,
                                  v8::Local<v8::Value> descriptor_object,
                                  V8PropertyDescriptorBag& descriptor_bag) {
  // TODO(crbug.com/1261485): This function is the same as
  // v8::internal::PropertyDescriptor::ToPropertyDescriptor.  Make the
  // function exposed public and re-use it rather than re-implementing
  // the same logic in Blink.

  auto& desc = descriptor_bag;
  desc = V8PropertyDescriptorBag();

  if (!descriptor_object->IsObject()) {
    V8ThrowException::ThrowTypeError(isolate,
                                     "Property description must be an object.");
    return;
  }

  v8::Local<v8::Context> current_context = isolate->GetCurrentContext();
  v8::Local<v8::Object> v8_desc = descriptor_object.As<v8::Object>();

  auto get_value = [&](const char* property, bool& has,
                       v8::Local<v8::Value>& value) -> bool {
    const auto& v8_property = V8AtomicString(isolate, property);
    if (!v8_desc->Has(current_context, v8_property).To(&has)) {
      return false;
    }
    if (has) {
      if (!v8_desc->Get(current_context, v8_property).ToLocal(&value)) {
        return false;
      }
    } else {
      value = v8::Undefined(isolate);
    }
    return true;
  };

  auto get_bool = [&](const char* property, bool& has, bool& value) -> bool {
    v8::Local<v8::Value> v8_value;
    if (!get_value(property, has, v8_value))
      return false;
    if (has) {
      value = v8_value->ToBoolean(isolate)->Value();
    }
    return true;
  };

  if (!get_bool("enumerable", desc.has_enumerable, desc.enumerable))
    return;

  if (!get_bool("configurable", desc.has_configurable, desc.configurable))
    return;

  if (!get_value("value", desc.has_value, desc.value))
    return;

  if (!get_bool("writable", desc.has_writable, desc.writable))
    return;

  if (!get_value("get", desc.has_get, desc.get))
    return;

  if (!get_value("set", desc.has_set, desc.set))
    return;

  if ((desc.has_get || desc.has_set) && (desc.has_value || desc.has_writable)) {
    V8ThrowException::ThrowTypeError(
        isolate,
        "Invalid property descriptor. Cannot both specify accessors and "
        "a value or writable attribute");
    return;
  }
}

}  // namespace bindings

}  // namespace blink