// Copyright 2021 the V8 project authors. All rights reserved.

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file.

#ifndef INCLUDE_V8_TEMPLATE_H_

#define INCLUDE_V8_TEMPLATE_H_

#include <cstddef>

#include <string_view>

#include "v8-data.h"               // NOLINT(build/include_directory)

#include "v8-exception.h"          // NOLINT(build/include_directory)

#include "v8-function-callback.h"  // NOLINT(build/include_directory)

#include "v8-local-handle.h"       // NOLINT(build/include_directory)

#include "v8-memory-span.h"        // NOLINT(build/include_directory)

#include "v8-object.h"             // NOLINT(build/include_directory)

#include "v8config.h"              // NOLINT(build/include_directory)

namespace v8 {

class CFunction;

class FunctionTemplate;

class ObjectTemplate;

class Signature;

// --- Templates ---

#define V8_INTRINSICS_LIST(F)                                 \

  F(ArrayProto_entries, array_entries_iterator)               \

  F(ArrayProto_forEach, array_for_each_iterator)              \

  F(ArrayProto_keys, array_keys_iterator)                     \

  F(ArrayProto_values, array_values_iterator)                 \

  F(ArrayPrototype, initial_array_prototype)                  \

  F(AsyncIteratorPrototype, initial_async_iterator_prototype) \

  F(ErrorPrototype, initial_error_prototype)                  \

  F(IteratorPrototype, initial_iterator_prototype)            \

  F(MapIteratorPrototype, initial_map_iterator_prototype)     \

  F(ObjProto_valueOf, object_value_of_function)               \

  F(SetIteratorPrototype, initial_set_iterator_prototype)

enum Intrinsic {

#define V8_DECL_INTRINSIC(name, iname) k##name,

  V8_INTRINSICS_LIST(V8_DECL_INTRINSIC)

#undef V8_DECL_INTRINSIC

};

/**

 * The superclass of object and function templates.

 */

class V8_EXPORT Template : public Data {

 public:

  /**

   * Adds a property to each instance created by this template.

   *

   * The property must be defined either as a primitive value, or a template.

   */

  void Set(Local<Name> name, Local<Data> value,

           PropertyAttribute attributes = None);

  void SetPrivate(Local<Private> name, Local<Data> value,

                  PropertyAttribute attributes = None);

  V8_INLINE void Set(Isolate* isolate, const char* name, Local<Data> value,

                     PropertyAttribute attributes = None);

  /**

   * Sets an "accessor property" on the object template, see

   * https://tc39.es/ecma262/#sec-object-type.

   *

   * Whenever the property with the given name is accessed on objects

   * created from this ObjectTemplate the getter and setter functions

   * are called.

   *

   * \param name The name of the property for which an accessor is added.

   * \param getter The callback to invoke when getting the property.

   * \param setter The callback to invoke when setting the property.

   * \param attribute The attributes of the property for which an accessor

   *   is added.

   */

  void SetAccessorProperty(

      Local<Name> name,

      Local<FunctionTemplate> getter = Local<FunctionTemplate>(),

      Local<FunctionTemplate> setter = Local<FunctionTemplate>(),

      PropertyAttribute attribute = None);

  /**

   * Sets a "data property" on the object template, see

   * https://tc39.es/ecma262/#sec-object-type.

   *

   * Whenever the property with the given name is accessed on objects

   * created from this Template the getter and setter callbacks

   * are called instead of getting and setting the property directly

   * on the JavaScript object.

   * Note that in case a property is written via a "child" object, the setter

   * will not be called according to the JavaScript specification. See

   * https://tc39.es/ecma262/#sec-ordinary-object-internal-methods-and-internal-slots-set-p-v-receiver.

   *

   * \param name The name of the data property for which an accessor is added.

   * \param getter The callback to invoke when getting the property.

   * \param setter The callback to invoke when setting the property.

   * \param data A piece of data that will be passed to the getter and setter

   *   callbacks whenever they are invoked.

   * \param attribute The attributes of the property for which an accessor

   *   is added.

   */

  void SetNativeDataProperty(

      Local<Name> name, AccessorNameGetterCallback getter,

      AccessorNameSetterCallback setter = nullptr,

      Local<Value> data = Local<Value>(), PropertyAttribute attribute = None,

      SideEffectType getter_side_effect_type = SideEffectType::kHasSideEffect,

      SideEffectType setter_side_effect_type = SideEffectType::kHasSideEffect);

  /**

   * Like SetNativeDataProperty, but V8 will replace the native data property

   * with a real data property on first access.

   */

  void SetLazyDataProperty(

      Local<Name> name, AccessorNameGetterCallback getter,

      Local<Value> data = Local<Value>(), PropertyAttribute attribute = None,

      SideEffectType getter_side_effect_type = SideEffectType::kHasSideEffect,

      SideEffectType setter_side_effect_type = SideEffectType::kHasSideEffect);

  /**

   * During template instantiation, sets the value with the intrinsic property

   * from the correct context.

   */

  void SetIntrinsicDataProperty(Local<Name> name, Intrinsic intrinsic,

                                PropertyAttribute attribute = None);

 private:

  Template();

  friend class ObjectTemplate;

  friend class FunctionTemplate;

};

/**

 * Interceptor callbacks use this value to indicate whether the request was

 * intercepted or not.

 */

enum class Intercepted : uint8_t { kNo = 0, kYes = 1 };

/**

 * Interceptor for get requests on an object.

 *

 * If the interceptor handles the request (i.e. the property should not be

 * looked up beyond the interceptor or in case an exception was thrown) it

 * should

 *  - (optionally) use info.GetReturnValue().Set()` to set the return value

 *    (by default the result is set to v8::Undefined),

 *  - return `Intercepted::kYes`.

 * If the interceptor does not handle the request it must return

 * `Intercepted::kNo` and it must not produce side effects.

 *

 * \param property The name of the property for which the request was

 * intercepted.

 * \param info Information about the intercepted request, such as

 * isolate, receiver, return value, or whether running in `'use strict'` mode.

 * See `PropertyCallbackInfo`.

 *

 * \code

 *  Intercepted GetterCallback(

 *      Local<Name> name, const v8::PropertyCallbackInfo<v8::Value>& info) {

 *    if (!IsKnownProperty(info.GetIsolate(), name)) return Intercepted::kNo;

 *    info.GetReturnValue().Set(v8_num(42));

 *    return Intercepted::kYes;

 *  }

 *

 *  v8::Local<v8::FunctionTemplate> templ =

 *      v8::FunctionTemplate::New(isolate);

 *  templ->InstanceTemplate()->SetHandler(

 *      v8::NamedPropertyHandlerConfiguration(GetterCallback));

 *  LocalContext env;

 *  env->Global()

 *      ->Set(env.local(), v8_str("obj"), templ->GetFunction(env.local())

 *                                             .ToLocalChecked()

 *                                             ->NewInstance(env.local())

 *                                             .ToLocalChecked())

 *      .FromJust();

 *  v8::Local<v8::Value> result = CompileRun("obj.a = 17; obj.a");

 *  CHECK(v8_num(42)->Equals(env.local(), result).FromJust());

 * \endcode

 *

 * See also `ObjectTemplate::SetHandler`.

 */

using NamedPropertyGetterCallback = Intercepted (*)(

    Local<Name> property, const PropertyCallbackInfo<Value>& info);

// This variant will be deprecated soon.

//

// Use `info.GetReturnValue().Set()` to set the return value of the

// intercepted get request. If the property does not exist the callback should

// not set the result and must not produce side effects.

using GenericNamedPropertyGetterCallback V8_DEPRECATE_SOON(

    "Use NamedPropertyGetterCallback instead") =

    void (*)(Local<Name> property, const PropertyCallbackInfo<Value>& info);

/**

 * Interceptor for set requests on an object.

 *

 * If the interceptor handles the request (i.e. the property should not be

 * looked up beyond the interceptor or in case an exception was thrown) it

 * should return `Intercepted::kYes`.

 * If the interceptor does not handle the request it must return

 * `Intercepted::kNo` and it must not produce side effects.

 *

 * \param property The name of the property for which the request was

 * intercepted.

 * \param value The value which the property will have if the request

 * is not intercepted.

 * \param info Information about the intercepted request, such as

 * isolate, receiver, return value, or whether running in `'use strict'` mode.

 * See `PropertyCallbackInfo`.

 *

 * See also `ObjectTemplate::SetHandler.`

 */

using NamedPropertySetterCallback =

    Intercepted (*)(Local<Name> property, Local<Value> value,

                    const PropertyCallbackInfo<void>& info);

// This variant will be deprecated soon.

//

// Use `info.GetReturnValue()` to indicate whether the request was intercepted

// or not. If the setter successfully intercepts the request, i.e., if the

// request should not be further executed, call

// `info.GetReturnValue().Set(value)`. If the setter did not intercept the

// request, i.e., if the request should be handled as if no interceptor is

// present, do not not call `Set()` and do not produce side effects.

using GenericNamedPropertySetterCallback V8_DEPRECATE_SOON(

    "Use NamedPropertySetterCallback instead") =

    void (*)(Local<Name> property, Local<Value> value,

             const PropertyCallbackInfo<Value>& info);

/**

 * Intercepts all requests that query the attributes of the

 * property, e.g., getOwnPropertyDescriptor(), propertyIsEnumerable(), and

 * defineProperty().

 *

 * If the interceptor handles the request (i.e. the property should not be

 * looked up beyond the interceptor or in case an exception was thrown) it

 * should

 *  - (optionally) use `info.GetReturnValue().Set()` to set to an Integer

 *    value encoding a `v8::PropertyAttribute` bits,

 *  - return `Intercepted::kYes`.

 * If the interceptor does not handle the request it must return

 * `Intercepted::kNo` and it must not produce side effects.

 *

 * \param property The name of the property for which the request was

 * intercepted.

 * \param info Information about the intercepted request, such as

 * isolate, receiver, return value, or whether running in `'use strict'` mode.

 * See `PropertyCallbackInfo`.

 *

 * \note Some functions query the property attributes internally, even though

 * they do not return the attributes. For example, `hasOwnProperty()` can

 * trigger this interceptor depending on the state of the object.

 *

 * See also `ObjectTemplate::SetHandler.`

 */

using NamedPropertyQueryCallback = Intercepted (*)(

    Local<Name> property, const PropertyCallbackInfo<Integer>& info);

// This variant will be deprecated soon.

//

// Use `info.GetReturnValue().Set(value)` to set the property attributes. The

// value is an integer encoding a `v8::PropertyAttribute`. If the property does

// not exist the callback should not set the result and must not produce side

// effects.

using GenericNamedPropertyQueryCallback V8_DEPRECATE_SOON(

    "Use NamedPropertyQueryCallback instead") =

    void (*)(Local<Name> property, const PropertyCallbackInfo<Integer>& info);

/**

 * Interceptor for delete requests on an object.

 *

 * If the interceptor handles the request (i.e. the property should not be

 * looked up beyond the interceptor or in case an exception was thrown) it

 * should

 *  - (optionally) use `info.GetReturnValue().Set()` to set to a Boolean value

 *    indicating whether the property deletion was successful or not,

 *  - return `Intercepted::kYes`.

 * If the interceptor does not handle the request it must return

 * `Intercepted::kNo` and it must not produce side effects.

 *

 * \param property The name of the property for which the request was

 * intercepted.

 * \param info Information about the intercepted request, such as

 * isolate, receiver, return value, or whether running in `'use strict'` mode.

 * See `PropertyCallbackInfo`.

 *

 * \note If you need to mimic the behavior of `delete`, i.e., throw in strict

 * mode instead of returning false, use `info.ShouldThrowOnError()` to determine

 * if you are in strict mode.

 *

 * See also `ObjectTemplate::SetHandler.`

 */

using NamedPropertyDeleterCallback = Intercepted (*)(

    Local<Name> property, const PropertyCallbackInfo<Boolean>& info);

// This variant will be deprecated soon.

//

// Use `info.GetReturnValue()` to indicate whether the request was intercepted

// or not. If the deleter successfully intercepts the request, i.e., if the

// request should not be further executed, call

// `info.GetReturnValue().Set(value)` with a boolean `value`. The `value` is

// used as the return value of `delete`. If the deleter does not intercept the

// request then it should not set the result and must not produce side effects.

using GenericNamedPropertyDeleterCallback V8_DEPRECATE_SOON(

    "Use NamedPropertyDeleterCallback instead") =

    void (*)(Local<Name> property, const PropertyCallbackInfo<Boolean>& info);

/**

 * Returns an array containing the names of the properties the named

 * property getter intercepts.

 *

 * Note: The values in the array must be of type v8::Name.

 */

using NamedPropertyEnumeratorCallback =

    void (*)(const PropertyCallbackInfo<Array>& info);

// This variant will be deprecated soon.

// This is just a renaming of the typedef.

using GenericNamedPropertyEnumeratorCallback V8_DEPRECATE_SOON(

    "Use NamedPropertyEnumeratorCallback instead") =

    NamedPropertyEnumeratorCallback;

/**

 * Interceptor for defineProperty requests on an object.

 *

 * If the interceptor handles the request (i.e. the property should not be

 * looked up beyond the interceptor or in case an exception was thrown) it

 * should return `Intercepted::kYes`.

 * If the interceptor does not handle the request it must return

 * `Intercepted::kNo` and it must not produce side effects.

 *

 * \param property The name of the property for which the request was

 * intercepted.

 * \param desc The property descriptor which is used to define the

 * property if the request is not intercepted.

 * \param info Information about the intercepted request, such as

 * isolate, receiver, return value, or whether running in `'use strict'` mode.

 * See `PropertyCallbackInfo`.

 *

 * See also `ObjectTemplate::SetHandler`.

 */

using NamedPropertyDefinerCallback =

    Intercepted (*)(Local<Name> property, const PropertyDescriptor& desc,

                    const PropertyCallbackInfo<void>& info);

// This variant will be deprecated soon.

//

// Use `info.GetReturnValue()` to indicate whether the request was intercepted

// or not. If the definer successfully intercepts the request, i.e., if the

// request should not be further executed, call

// `info.GetReturnValue().Set(value)`. If the definer did not intercept the

// request, i.e., if the request should be handled as if no interceptor is

// present, do not not call `Set()` and do not produce side effects.

using GenericNamedPropertyDefinerCallback V8_DEPRECATE_SOON(

    "Use NamedPropertyDefinerCallback instead") =

    void (*)(Local<Name> property, const PropertyDescriptor& desc,

             const PropertyCallbackInfo<Value>& info);

/**

 * Interceptor for getOwnPropertyDescriptor requests on an object.

 *

 * If the interceptor handles the request (i.e. the property should not be

 * looked up beyond the interceptor or in case an exception was thrown) it

 * should

 *  - (optionally) use `info.GetReturnValue().Set()` to set the return value

 *    which must be object that can be converted to a PropertyDescriptor (for

 *    example, a value returned by `v8::Object::getOwnPropertyDescriptor`),

 *  - return `Intercepted::kYes`.

 * If the interceptor does not handle the request it must return

 * `Intercepted::kNo` and it must not produce side effects.

 *

 * \param property The name of the property for which the request was

 * intercepted.

 * \info Information about the intercepted request, such as

 * isolate, receiver, return value, or whether running in `'use strict'` mode.

 * See `PropertyCallbackInfo`.

 *

 * \note If GetOwnPropertyDescriptor is intercepted, it will

 * always return true, i.e., indicate that the property was found.

 *

 * See also `ObjectTemplate::SetHandler`.

 */

using NamedPropertyDescriptorCallback = Intercepted (*)(

    Local<Name> property, const PropertyCallbackInfo<Value>& info);

// This variant will be deprecated soon.

//

// Use `info.GetReturnValue().Set()` to set the return value of the

// intercepted request. The return value must be an object that

// can be converted to a PropertyDescriptor, e.g., a `v8::Value` returned from

// `v8::Object::getOwnPropertyDescriptor`.

using GenericNamedPropertyDescriptorCallback V8_DEPRECATE_SOON(

    "Use NamedPropertyDescriptorCallback instead") =

    void (*)(Local<Name> property, const PropertyCallbackInfo<Value>& info);

// TODO(ishell): Rename IndexedPropertyXxxCallbackV2 back to

// IndexedPropertyXxxCallback once the old IndexedPropertyXxxCallback is

// removed.

/**

 * See `v8::NamedPropertyGetterCallback`.

 */

using IndexedPropertyGetterCallbackV2 =

    Intercepted (*)(uint32_t index, const PropertyCallbackInfo<Value>& info);

// This variant will be deprecated soon.

using IndexedPropertyGetterCallback V8_DEPRECATE_SOON(

    "Use IndexedPropertyGetterCallbackV2 instead") =

    void (*)(uint32_t index, const PropertyCallbackInfo<Value>& info);

/**

 * See `v8::NamedPropertySetterCallback`.

 */

using IndexedPropertySetterCallbackV2 = Intercepted (*)(

    uint32_t index, Local<Value> value, const PropertyCallbackInfo<void>& info);

// This variant will be deprecated soon.

using IndexedPropertySetterCallback V8_DEPRECATE_SOON(

    "Use IndexedPropertySetterCallbackV2 instead") =

    void (*)(uint32_t index, Local<Value> value,

             const PropertyCallbackInfo<Value>& info);

/**

 * See `v8::NamedPropertyQueryCallback`.

 */

using IndexedPropertyQueryCallbackV2 =

    Intercepted (*)(uint32_t index, const PropertyCallbackInfo<Integer>& info);

// This variant will be deprecated soon.

using IndexedPropertyQueryCallback V8_DEPRECATE_SOON(

    "Use IndexedPropertyQueryCallbackV2 instead") =

    void (*)(uint32_t index, const PropertyCallbackInfo<Integer>& info);

/**

 * See `v8::NamedPropertyDeleterCallback`.

 */

using IndexedPropertyDeleterCallbackV2 =

    Intercepted (*)(uint32_t index, const PropertyCallbackInfo<Boolean>& info);

// This variant will be deprecated soon.

using IndexedPropertyDeleterCallback V8_DEPRECATE_SOON(

    "Use IndexedPropertyDeleterCallbackV2 instead") =

    void (*)(uint32_t index, const PropertyCallbackInfo<Boolean>& info);

/**

 * Returns an array containing the indices of the properties the indexed

 * property getter intercepts.

 *

 * Note: The values in the array must be uint32_t.

 */

using IndexedPropertyEnumeratorCallback =

    void (*)(const PropertyCallbackInfo<Array>& info);

/**

 * See `v8::NamedPropertyDefinerCallback`.

 */

using IndexedPropertyDefinerCallbackV2 =

    Intercepted (*)(uint32_t index, const PropertyDescriptor& desc,

                    const PropertyCallbackInfo<void>& info);

// This variant will be deprecated soon.

using IndexedPropertyDefinerCallback V8_DEPRECATE_SOON(

    "Use IndexedPropertyDefinerCallbackV2 instead") =

    void (*)(uint32_t index, const PropertyDescriptor& desc,

             const PropertyCallbackInfo<Value>& info);

/**

 * See `v8::NamedPropertyDescriptorCallback`.

 */

using IndexedPropertyDescriptorCallbackV2 =

    Intercepted (*)(uint32_t index, const PropertyCallbackInfo<Value>& info);

// This variant will be deprecated soon.

using IndexedPropertyDescriptorCallback V8_DEPRECATE_SOON(

    "Use IndexedPropertyDescriptorCallbackV2 instead") =

    void (*)(uint32_t index, const PropertyCallbackInfo<Value>& info);

/**

 * Returns true if the given context should be allowed to access the given

 * object.

 */

using AccessCheckCallback = bool (*)(Local<Context> accessing_context,

                                     Local<Object> accessed_object,

                                     Local<Value> data);

enum class ConstructorBehavior { kThrow, kAllow };

/**

 * A FunctionTemplate is used to create functions at runtime. There

 * can only be one function created from a FunctionTemplate in a

 * context.  The lifetime of the created function is equal to the

 * lifetime of the context.  So in case the embedder needs to create

 * temporary functions that can be collected using Scripts is

 * preferred.

 *

 * Any modification of a FunctionTemplate after first instantiation will trigger

 * a crash.

 *

 * A FunctionTemplate can have properties, these properties are added to the

 * function object when it is created.

 *

 * A FunctionTemplate has a corresponding instance template which is

 * used to create object instances when the function is used as a

 * constructor. Properties added to the instance template are added to

 * each object instance.

 *

 * A FunctionTemplate can have a prototype template. The prototype template

 * is used to create the prototype object of the function.

 *

 * The following example shows how to use a FunctionTemplate:

 *

 * \code

 *    v8::Local<v8::FunctionTemplate> t = v8::FunctionTemplate::New(isolate);

 *    t->Set(isolate, "func_property", v8::Number::New(isolate, 1));

 *

 *    v8::Local<v8::Template> proto_t = t->PrototypeTemplate();

 *    proto_t->Set(isolate,

 *                 "proto_method",

 *                 v8::FunctionTemplate::New(isolate, InvokeCallback));

 *    proto_t->Set(isolate, "proto_const", v8::Number::New(isolate, 2));

 *

 *    v8::Local<v8::ObjectTemplate> instance_t = t->InstanceTemplate();

 *    instance_t->SetNativeDataProperty(

 *        String::NewFromUtf8Literal(isolate, "instance_accessor"),

 *        InstanceAccessorCallback);

 *    instance_t->SetHandler(

 *        NamedPropertyHandlerConfiguration(PropertyHandlerCallback));

 *    instance_t->Set(String::NewFromUtf8Literal(isolate, "instance_property"),

 *                    Number::New(isolate, 3));

 *

 *    v8::Local<v8::Function> function = t->GetFunction();

 *    v8::Local<v8::Object> instance = function->NewInstance();

 * \endcode

 *

 * Let's use "function" as the JS variable name of the function object

 * and "instance" for the instance object created above.  The function

 * and the instance will have the following properties:

 *

 * \code

 *   func_property in function == true;

 *   function.func_property == 1;

 *

 *   function.prototype.proto_method() invokes 'InvokeCallback'

 *   function.prototype.proto_const == 2;

 *

 *   instance instanceof function == true;

 *   instance.instance_accessor calls 'InstanceAccessorCallback'

 *   instance.instance_property == 3;

 * \endcode

 *

 * A FunctionTemplate can inherit from another one by calling the

 * FunctionTemplate::Inherit method.  The following graph illustrates

 * the semantics of inheritance:

 *

 * \code

 *   FunctionTemplate Parent  -> Parent() . prototype -> { }

 *     ^                                                  ^

 *     | Inherit(Parent)                                  | .__proto__

 *     |                                                  |

 *   FunctionTemplate Child   -> Child()  . prototype -> { }

 * \endcode

 *

 * A FunctionTemplate 'Child' inherits from 'Parent', the prototype

 * object of the Child() function has __proto__ pointing to the

 * Parent() function's prototype object. An instance of the Child

 * function has all properties on Parent's instance templates.

 *

 * Let Parent be the FunctionTemplate initialized in the previous

 * section and create a Child FunctionTemplate by:

 *

 * \code

 *   Local<FunctionTemplate> parent = t;

 *   Local<FunctionTemplate> child = FunctionTemplate::New();

 *   child->Inherit(parent);

 *

 *   Local<Function> child_function = child->GetFunction();

 *   Local<Object> child_instance = child_function->NewInstance();

 * \endcode

 *

 * The Child function and Child instance will have the following

 * properties:

 *

 * \code

 *   child_func.prototype.__proto__ == function.prototype;

 *   child_instance.instance_accessor calls 'InstanceAccessorCallback'

 *   child_instance.instance_property == 3;

 * \endcode

 *

 * The additional 'c_function' parameter refers to a fast API call, which

 * must not trigger GC or JavaScript execution, or call into V8 in other

 * ways. For more information how to define them, see

 * include/v8-fast-api-calls.h. Please note that this feature is still

 * experimental.

 */

class V8_EXPORT FunctionTemplate : public Template {

 public:

  /** Creates a function template.*/

  static Local<FunctionTemplate> New(

      Isolate* isolate, FunctionCallback callback = nullptr,

      Local<Value> data = Local<Value>(),

      Local<Signature> signature = Local<Signature>(), int length = 0,

      ConstructorBehavior behavior = ConstructorBehavior::kAllow,

      SideEffectType side_effect_type = SideEffectType::kHasSideEffect,

      const CFunction* c_function = nullptr, uint16_t instance_type = 0,

      uint16_t allowed_receiver_instance_type_range_start = 0,

      uint16_t allowed_receiver_instance_type_range_end = 0);

  /** Creates a function template for multiple overloaded fast API calls.*/

  static Local<FunctionTemplate> NewWithCFunctionOverloads(

      Isolate* isolate, FunctionCallback callback = nullptr,

      Local<Value> data = Local<Value>(),

      Local<Signature> signature = Local<Signature>(), int length = 0,

      ConstructorBehavior behavior = ConstructorBehavior::kAllow,

      SideEffectType side_effect_type = SideEffectType::kHasSideEffect,

      const MemorySpan<const CFunction>& c_function_overloads = {});

  /**

   * Creates a function template backed/cached by a private property.

   */

  static Local<FunctionTemplate> NewWithCache(

      Isolate* isolate, FunctionCallback callback,

      Local<Private> cache_property, Local<Value> data = Local<Value>(),

      Local<Signature> signature = Local<Signature>(), int length = 0,

      SideEffectType side_effect_type = SideEffectType::kHasSideEffect);

  /** Returns the unique function instance in the current execution context.*/

  V8_WARN_UNUSED_RESULT MaybeLocal<Function> GetFunction(

      Local<Context> context);

  /**

   * Similar to Context::NewRemoteContext, this creates an instance that

   * isn't backed by an actual object.

   *

   * The InstanceTemplate of this FunctionTemplate must have access checks with

   * handlers installed.

   */

  V8_WARN_UNUSED_RESULT MaybeLocal<Object> NewRemoteInstance();

  /**

   * Set the call-handler callback for a FunctionTemplate.  This

   * callback is called whenever the function created from this

   * FunctionTemplate is called. The 'c_function' represents a fast

   * API call, see the comment above the class declaration.

   */

  void SetCallHandler(

      FunctionCallback callback, Local<Value> data = Local<Value>(),

      SideEffectType side_effect_type = SideEffectType::kHasSideEffect,

      const MemorySpan<const CFunction>& c_function_overloads = {});

  /** Set the predefined length property for the FunctionTemplate. */

  void SetLength(int length);

  /** Get the InstanceTemplate. */

  Local<ObjectTemplate> InstanceTemplate();

  /**

   * Causes the function template to inherit from a parent function template.

   * This means the function's prototype.__proto__ is set to the parent

   * function's prototype.

   **/

  void Inherit(Local<FunctionTemplate> parent);

  /**

   * A PrototypeTemplate is the template used to create the prototype object

   * of the function created by this template.

   */

  Local<ObjectTemplate> PrototypeTemplate();

  /**

   * A PrototypeProviderTemplate is another function template whose prototype

   * property is used for this template. This is mutually exclusive with setting

   * a prototype template indirectly by calling PrototypeTemplate() or using

   * Inherit().

   **/

  void SetPrototypeProviderTemplate(Local<FunctionTemplate> prototype_provider);

  /**

   * Set the class name of the FunctionTemplate.  This is used for

   * printing objects created with the function created from the

   * FunctionTemplate as its constructor.

   */

  void SetClassName(Local<String> name);

  /**

   * Set the interface name of the FunctionTemplate. This is provided as

   * contextual information in an ExceptionPropagationMessage to the embedder.

   */

  void SetInterfaceName(Local<String> name);

  /**

   * Provides information on the type of FunctionTemplate for embedder

   * exception handling.

   */

  void SetExceptionContext(ExceptionContext context);

  /**

   * When set to true, no access check will be performed on the receiver of a

   * function call.  Currently defaults to true, but this is subject to change.

   */

  void SetAcceptAnyReceiver(bool value);

  /**

   * Sets the ReadOnly flag in the attributes of the 'prototype' property

   * of functions created from this FunctionTemplate to true.

   */

  void ReadOnlyPrototype();

  /**

   * Removes the prototype property from functions created from this

   * FunctionTemplate.

   */

  void RemovePrototype();

  /**

   * Returns true if the given object is an instance of this function

   * template.

   */

  bool HasInstance(Local<Value> object);

  /**

   * Returns true if the given value is an API object that was constructed by an

   * instance of this function template (without checking for inheriting

   * function templates).

   *

   * This is an experimental feature and may still change significantly.

   */

  bool IsLeafTemplateForApiObject(v8::Local<v8::Value> value) const;

  /**

   * Seal the object and mark it for promotion to read only space during

   * context snapshot creation.

   *

   * This is an experimental feature and may still change significantly.

   */

  void SealAndPrepareForPromotionToReadOnly();

  V8_INLINE static FunctionTemplate* Cast(Data* data);

 private:

  FunctionTemplate();

  static void CheckCast(Data* that);

  friend class Context;

  friend class ObjectTemplate;

};

/**

 * Configuration flags for v8::NamedPropertyHandlerConfiguration or

 * v8::IndexedPropertyHandlerConfiguration.

 */

enum class PropertyHandlerFlags {

  /**

   * None.

   */

  kNone = 0,

  /**

   * Will not call into interceptor for properties on the receiver or prototype

   * chain, i.e., only call into interceptor for properties that do not exist.

   * Currently only valid for named interceptors.

   */

  kNonMasking = 1,

  /**

   * Will not call into interceptor for symbol lookup.  Only meaningful for

   * named interceptors.

   */

  kOnlyInterceptStrings = 1 << 1,

  /**

   * The getter, query, enumerator callbacks do not produce side effects.

   */

  kHasNoSideEffect = 1 << 2,

  /**

   * This flag is used to distinguish which callbacks were provided -

   * GenericNamedPropertyXXXCallback (old signature) or

   * NamedPropertyXXXCallback (new signature).

   * DO NOT use this flag, it'll be removed once embedders migrate to new

   * callbacks signatures.

   */

  kInternalNewCallbacksSignatures = 1 << 10,

};

struct NamedPropertyHandlerConfiguration {

 private:

  static constexpr PropertyHandlerFlags WithNewSignatureFlag(

      PropertyHandlerFlags flags) {

    return static_cast<PropertyHandlerFlags>(

        static_cast<int>(flags) |

        static_cast<int>(

            PropertyHandlerFlags::kInternalNewCallbacksSignatures));

  }

 public:

  NamedPropertyHandlerConfiguration(

      NamedPropertyGetterCallback getter,          //

      NamedPropertySetterCallback setter,          //

      NamedPropertyQueryCallback query,            //

      NamedPropertyDeleterCallback deleter,        //

      NamedPropertyEnumeratorCallback enumerator,  //

      NamedPropertyDefinerCallback definer,        //

      NamedPropertyDescriptorCallback descriptor,  //

      Local<Value> data = Local<Value>(),

      PropertyHandlerFlags flags = PropertyHandlerFlags::kNone)

      : getter(getter),

        setter(setter),

        query(query),

        deleter(deleter),

        enumerator(enumerator),

        definer(definer),

        descriptor(descriptor),

        data(data),

        flags(flags) {}

  explicit NamedPropertyHandlerConfiguration(

      NamedPropertyGetterCallback getter,

      NamedPropertySetterCallback setter = nullptr,

      NamedPropertyQueryCallback query = nullptr,

      NamedPropertyDeleterCallback deleter = nullptr,

      NamedPropertyEnumeratorCallback enumerator = nullptr,

      Local<Value> data = Local<Value>(),

      PropertyHandlerFlags flags = PropertyHandlerFlags::kNone)

      : getter(getter),

        setter(setter),

        query(query),

        deleter(deleter),

        enumerator(enumerator),

        definer(nullptr),

        descriptor(nullptr),

        data(data),

        flags(flags) {}

  NamedPropertyHandlerConfiguration(

      NamedPropertyGetterCallback getter,          //

      NamedPropertySetterCallback setter,          //

      NamedPropertyDescriptorCallback descriptor,  //

      NamedPropertyDeleterCallback deleter,        //

      NamedPropertyEnumeratorCallback enumerator,  //

      NamedPropertyDefinerCallback definer,        //

      Local<Value> data = Local<Value>(),

      PropertyHandlerFlags flags = PropertyHandlerFlags::kNone)

      : getter(getter),

        setter(setter),

        query(nullptr),

        deleter(deleter),

        enumerator(enumerator),

        definer(definer),

        descriptor(descriptor),

        data(data),

        flags(flags) {}

  NamedPropertyGetterCallback getter;

  NamedPropertySetterCallback setter;

  NamedPropertyQueryCallback query;

  NamedPropertyDeleterCallback deleter;

  NamedPropertyEnumeratorCallback enumerator;

  NamedPropertyDefinerCallback definer;

  NamedPropertyDescriptorCallback descriptor;

  Local<Value> data;

  PropertyHandlerFlags flags;

};

struct IndexedPropertyHandlerConfiguration {

 private:

  static constexpr PropertyHandlerFlags WithNewSignatureFlag(

      PropertyHandlerFlags flags) {

    return static_cast<PropertyHandlerFlags>(

        static_cast<int>(flags) |

        static_cast<int>(

            PropertyHandlerFlags::kInternalNewCallbacksSignatures));

  }

 public:

  IndexedPropertyHandlerConfiguration(

      IndexedPropertyGetterCallbackV2 getter,          //

      IndexedPropertySetterCallbackV2 setter,          //

      IndexedPropertyQueryCallbackV2 query,            //

      IndexedPropertyDeleterCallbackV2 deleter,        //

      IndexedPropertyEnumeratorCallback enumerator,    //

      IndexedPropertyDefinerCallbackV2 definer,        //

      IndexedPropertyDescriptorCallbackV2 descriptor,  //

      Local<Value> data = Local<Value>(),

      PropertyHandlerFlags flags = PropertyHandlerFlags::kNone)

      : getter(getter),

        setter(setter),

        query(query),

        deleter(deleter),

        enumerator(enumerator),

        definer(definer),

        descriptor(descriptor),

        data(data),

        flags(flags) {}

  explicit IndexedPropertyHandlerConfiguration(

      IndexedPropertyGetterCallbackV2 getter = nullptr,

      IndexedPropertySetterCallbackV2 setter = nullptr,

      IndexedPropertyQueryCallbackV2 query = nullptr,

      IndexedPropertyDeleterCallbackV2 deleter = nullptr,

      IndexedPropertyEnumeratorCallback enumerator = nullptr,

      Local<Value> data = Local<Value>(),

      PropertyHandlerFlags flags = PropertyHandlerFlags::kNone)

      : getter(getter),

        setter(setter),

        query(query),

        deleter(deleter),

        enumerator(enumerator),

        definer(nullptr),

        descriptor(nullptr),

        data(data),

        flags(flags) {}

  IndexedPropertyHandlerConfiguration(

      IndexedPropertyGetterCallbackV2 getter,

      IndexedPropertySetterCallbackV2 setter,

      IndexedPropertyDescriptorCallbackV2 descriptor,

      IndexedPropertyDeleterCallbackV2 deleter,

      IndexedPropertyEnumeratorCallback enumerator,

      IndexedPropertyDefinerCallbackV2 definer,

      Local<Value> data = Local<Value>(),

      PropertyHandlerFlags flags = PropertyHandlerFlags::kNone)

      : getter(getter),

        setter(setter),

        query(nullptr),

        deleter(deleter),

        enumerator(enumerator),

        definer(definer),

        descriptor(descriptor),

        data(data),

        flags(flags) {}

  IndexedPropertyGetterCallbackV2 getter;

  IndexedPropertySetterCallbackV2 setter;

  IndexedPropertyQueryCallbackV2 query;

  IndexedPropertyDeleterCallbackV2 deleter;

  IndexedPropertyEnumeratorCallback enumerator;

  IndexedPropertyDefinerCallbackV2 definer;

  IndexedPropertyDescriptorCallbackV2 descriptor;

  Local<Value> data;

  PropertyHandlerFlags flags;

};

/**

 * An ObjectTemplate is used to create objects at runtime.

 *

 * Properties added to an ObjectTemplate are added to each object

 * created from the ObjectTemplate.

 */

class V8_EXPORT ObjectTemplate : public Template {

 public:

  /** Creates an ObjectTemplate. */

  static Local<ObjectTemplate> New(

      Isolate* isolate,

      Local<FunctionTemplate> constructor = Local<FunctionTemplate>());

  /**

   * Creates a new instance of this template.

   *

   * \param context The context in which the instance is created.

   */

  V8_WARN_UNUSED_RESULT MaybeLocal<Object> NewInstance(Local<Context> context);

  /**

   * Sets a named property handler on the object template.

   *

   * Whenever a property whose name is a string or a symbol is accessed on

   * objects created from this object template, the provided callback is

   * invoked instead of accessing the property directly on the JavaScript

   * object.

   *

   * @param configuration The NamedPropertyHandlerConfiguration that defines the

   * callbacks to invoke when accessing a property.

   */

  void SetHandler(const NamedPropertyHandlerConfiguration& configuration);

  /**

   * Sets an indexed property handler on the object template.

   *

   * Whenever an indexed property is accessed on objects created from

   * this object template, the provided callback is invoked instead of

   * accessing the property directly on the JavaScript object.

   *

   * @param configuration The IndexedPropertyHandlerConfiguration that defines

   * the callbacks to invoke when accessing a property.

   */

  void SetHandler(const IndexedPropertyHandlerConfiguration& configuration);

  /**

   * Sets the callback to be used when calling instances created from

   * this template as a function.  If no callback is set, instances

   * behave like normal JavaScript objects that cannot be called as a

   * function.

   */

  void SetCallAsFunctionHandler(FunctionCallback callback,

                                Local<Value> data = Local<Value>());

  /**

   * Mark object instances of the template as undetectable.

   *

   * In many ways, undetectable objects behave as though they are not

   * there.  They behave like 'undefined' in conditionals and when

   * printed.  However, properties can be accessed and called as on

   * normal objects.

   */

  void MarkAsUndetectable();

  /**

   * Sets access check callback on the object template and enables access

   * checks.

   *

   * When accessing properties on instances of this object template,

   * the access check callback will be called to determine whether or

   * not to allow cross-context access to the properties.

   */

  void SetAccessCheckCallback(AccessCheckCallback callback,

                              Local<Value> data = Local<Value>());

  /**

   * Like SetAccessCheckCallback but invokes an interceptor on failed access

   * checks instead of looking up all-can-read properties. You can only use

   * either this method or SetAccessCheckCallback, but not both at the same

   * time.

   */

  void SetAccessCheckCallbackAndHandler(

      AccessCheckCallback callback,

      const NamedPropertyHandlerConfiguration& named_handler,

      const IndexedPropertyHandlerConfiguration& indexed_handler,

      Local<Value> data = Local<Value>());

  /**

   * Gets the number of internal fields for objects generated from

   * this template.

   */

  int InternalFieldCount() const;

  /**

   * Sets the number of internal fields for objects generated from

   * this template.

   */

  void SetInternalFieldCount(int value);

  /**

   * Returns true if the object will be an immutable prototype exotic object.

   */

  bool IsImmutableProto() const;

  /**

   * Makes the ObjectTemplate for an immutable prototype exotic object, with an

   * immutable __proto__.

   */

  void SetImmutableProto();

  /**

   * Support for TC39 "dynamic code brand checks" proposal.

   *

   * This API allows to mark (& query) objects as "code like", which causes

   * them to be treated like Strings in the context of eval and function

   * constructor.

   *

   * Reference: https://github.com/tc39/proposal-dynamic-code-brand-checks

   */

  void SetCodeLike();

  bool IsCodeLike() const;

  /**

   * Seal the object and mark it for promotion to read only space during

   * context snapshot creation.

   *

   * This is an experimental feature and may still change significantly.

   */

  void SealAndPrepareForPromotionToReadOnly();

  V8_INLINE static ObjectTemplate* Cast(Data* data);

 private:

  ObjectTemplate();

  static void CheckCast(Data* that);

  friend class FunctionTemplate;

};

/**

 * A template to create dictionary objects at runtime.

 */

class V8_EXPORT DictionaryTemplate final : public Data {

 public:

  /** Creates a new template. Also declares data properties that can be passed

   * on instantiation of the template. Properties can only be declared on

   * construction and are then immutable. The values are passed on creating the

   * object via `NewInstance()`.

   *

   * \param names the keys that can be passed on instantiation.

   */

  static Local<DictionaryTemplate> New(

      Isolate* isolate, MemorySpan<const std::string_view> names);

  /**

   * Creates a new instance of this template.

   *

   * \param context The context used to create the dictionary object.

   * \param property_values Values of properties that were declared using

   *   `DeclareDataProperties()`. The span only passes values and expectes the

   *   order to match the declaration. Non-existent properties are signaled via

   *   empty `MaybeLocal`s.

   */

  V8_WARN_UNUSED_RESULT Local<Object> NewInstance(

      Local<Context> context, MemorySpan<MaybeLocal<Value>> property_values);

  V8_INLINE static DictionaryTemplate* Cast(Data* data);

 private:

  static void CheckCast(Data* that);

  DictionaryTemplate();

};

/**

 * A Signature specifies which receiver is valid for a function.

 *

 * A receiver matches a given signature if the receiver (or any of its

 * hidden prototypes) was created from the signature's FunctionTemplate, or

 * from a FunctionTemplate that inherits directly or indirectly from the

 * signature's FunctionTemplate.

 */

class V8_EXPORT Signature : public Data {

 public:

  static Local<Signature> New(

      Isolate* isolate,

      Local<FunctionTemplate> receiver = Local<FunctionTemplate>());

  V8_INLINE static Signature* Cast(Data* data);

 private:

  Signature();

  static void CheckCast(Data* that);

};

// --- Implementation ---

void Template::Set(Isolate* isolate, const char* name, Local<Data> value,

                   PropertyAttribute attributes) {

  Set(String::NewFromUtf8(isolate, name, NewStringType::kInternalized)