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// 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_CONTAINER_H_
#define INCLUDE_V8_CONTAINER_H_
#include <stddef.h>
#include <stdint.h>
#include <functional>
#include "v8-local-handle.h" // NOLINT(build/include_directory)
#include "v8-object.h" // NOLINT(build/include_directory)
#include "v8config.h" // NOLINT(build/include_directory)
namespace v8 {
class Context;
class Isolate;
/**
* An instance of the built-in array constructor (ECMA-262, 15.4.2).
*/
class V8_EXPORT Array : public Object {
public:
uint32_t Length() const;
/**
* Creates a JavaScript array with the given length. If the length
* is negative the returned array will have length 0.
*/
static Local<Array> New(Isolate* isolate, int length = 0);
/**
* Creates a JavaScript array out of a Local<Value> array in C++
* with a known length.
*/
static Local<Array> New(Isolate* isolate, Local<Value>* elements,
size_t length);
V8_INLINE static Array* Cast(Value* value) {
#ifdef V8_ENABLE_CHECKS
CheckCast(value);
#endif
return static_cast<Array*>(value);
}
/**
* Creates a JavaScript array from a provided callback.
*
* \param context The v8::Context to create the array in.
* \param length The length of the array to be created.
* \param next_value_callback The callback that is invoked to retrieve
* elements for the array. The embedder can signal that the array
* initialization should be aborted by throwing an exception and returning
* an empty MaybeLocal.
* \returns The v8::Array if all elements were constructed successfully and an
* empty MaybeLocal otherwise.
*/
static MaybeLocal<Array> New(
Local<Context> context, size_t length,
std::function<MaybeLocal<v8::Value>()> next_value_callback);
enum class CallbackResult {
kException,
kBreak,
kContinue,
};
using IterationCallback = CallbackResult (*)(uint32_t index,
Local<Value> element,
void* data);
/**
* Calls {callback} for every element of this array, passing {callback_data}
* as its {data} parameter.
* This function will typically be faster than calling {Get()} repeatedly.
* As a consequence of being optimized for low overhead, the provided
* callback must adhere to the following restrictions:
* - It must not allocate any V8 objects and continue iterating; it may
* allocate (e.g. an error message/object) and then immediately terminate
* the iteration.
* - It must not modify the array being iterated.
* - It must not call back into V8 (unless it can guarantee that such a
* call does not violate the above restrictions, which is difficult).
* - The {Local<Value> element} must not "escape", i.e. must not be assigned
* to any other {Local}. Creating a {Global} from it, or updating a
* v8::TypecheckWitness with it, is safe.
* These restrictions may be lifted in the future if use cases arise that
* justify a slower but more robust implementation.
*
* Returns {Nothing} on exception; use a {TryCatch} to catch and handle this
* exception.
* When the {callback} returns {kException}, iteration is terminated
* immediately, returning {Nothing}. By returning {kBreak}, the callback
* can request non-exceptional early termination of the iteration.
*/
Maybe<void> Iterate(Local<Context> context, IterationCallback callback,
void* callback_data);
private:
Array();
static void CheckCast(Value* obj);
};
/**
* An instance of the built-in Map constructor (ECMA-262, 6th Edition, 23.1.1).
*/
class V8_EXPORT Map : public Object {
public:
size_t Size() const;
void Clear();
V8_WARN_UNUSED_RESULT MaybeLocal<Value> Get(Local<Context> context,
Local<Value> key);
V8_WARN_UNUSED_RESULT MaybeLocal<Map> Set(Local<Context> context,
Local<Value> key,
Local<Value> value);
V8_WARN_UNUSED_RESULT Maybe<bool> Has(Local<Context> context,
Local<Value> key);
V8_WARN_UNUSED_RESULT Maybe<bool> Delete(Local<Context> context,
Local<Value> key);
/**
* Returns an array of length Size() * 2, where index N is the Nth key and
* index N + 1 is the Nth value.
*/
Local<Array> AsArray() const;
/**
* Creates a new empty Map.
*/
static Local<Map> New(Isolate* isolate);
V8_INLINE static Map* Cast(Value* value) {
#ifdef V8_ENABLE_CHECKS
CheckCast(value);
#endif
return static_cast<Map*>(value);
}
private:
Map();
static void CheckCast(Value* obj);
};
/**
* An instance of the built-in Set constructor (ECMA-262, 6th Edition, 23.2.1).
*/
class V8_EXPORT Set : public Object {
public:
size_t Size() const;
void Clear();
V8_WARN_UNUSED_RESULT MaybeLocal<Set> Add(Local<Context> context,
Local<Value> key);
V8_WARN_UNUSED_RESULT Maybe<bool> Has(Local<Context> context,
Local<Value> key);
V8_WARN_UNUSED_RESULT Maybe<bool> Delete(Local<Context> context,
Local<Value> key);
/**
* Returns an array of the keys in this Set.
*/
Local<Array> AsArray() const;
/**
* Creates a new empty Set.
*/
static Local<Set> New(Isolate* isolate);
V8_INLINE static Set* Cast(Value* value) {
#ifdef V8_ENABLE_CHECKS
CheckCast(value);
#endif
return static_cast<Set*>(value);
}
private:
Set();
static void CheckCast(Value* obj);
};
} // namespace v8
#endif // INCLUDE_V8_CONTAINER_H_