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// Copyright 2015 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.
#ifndef EXTENSIONS_RENDERER_V8_HELPERS_H_
#define EXTENSIONS_RENDERER_V8_HELPERS_H_
#include <stdint.h>
#include <string.h>
#include "base/strings/string_number_conversions.h"
#include "third_party/WebKit/public/web/WebScopedMicrotaskSuppression.h"
#include "v8/include/v8.h"
namespace extensions {
namespace v8_helpers {
// Helper functions for V8 APIs.
// Converts |str| to a V8 string. Returns true on success.
inline bool ToV8String(v8::Isolate* isolate,
const char* str,
v8::Local<v8::String>* out) {
return v8::String::NewFromUtf8(isolate, str, v8::NewStringType::kNormal)
.ToLocal(out);
}
inline bool ToV8String(v8::Isolate* isolate,
const std::string& str,
v8::Local<v8::String>* out) {
return ToV8String(isolate, str.c_str(), out);
}
// Converts |str| to a V8 string.
// This crashes when strlen(str) > v8::String::kMaxLength.
inline v8::Local<v8::String> ToV8StringUnsafe(
v8::Isolate* isolate,
const char* str,
v8::NewStringType string_type = v8::NewStringType::kNormal) {
DCHECK(strlen(str) <= v8::String::kMaxLength);
return v8::String::NewFromUtf8(isolate, str, string_type)
.ToLocalChecked();
}
inline v8::Local<v8::String> ToV8StringUnsafe(
v8::Isolate* isolate,
const std::string& str,
v8::NewStringType string_type = v8::NewStringType::kNormal) {
return ToV8StringUnsafe(isolate, str.c_str(), string_type);
}
// Returns true if |maybe| is both a value, and that value is true.
inline bool IsTrue(v8::Maybe<bool> maybe) {
return maybe.IsJust() && maybe.FromJust();
}
// Returns true if |value| is empty or undefined.
inline bool IsEmptyOrUndefied(v8::Local<v8::Value> value) {
return value.IsEmpty() || value->IsUndefined();
}
// SetProperty() family wraps V8::Object::DefineOwnProperty().
// Returns true on success.
// NOTE: Think about whether you want this or SetPrivateProperty() below.
// TODO(devlin): Sort through more of the callers of this and see if we can
// convert more to be private.
inline bool SetProperty(v8::Local<v8::Context> context,
v8::Local<v8::Object> object,
v8::Local<v8::String> key,
v8::Local<v8::Value> value) {
return IsTrue(object->DefineOwnProperty(context, key, value));
}
// Wraps v8::Object::SetPrivate(). When possible, prefer this to SetProperty().
inline bool SetPrivateProperty(v8::Local<v8::Context> context,
v8::Local<v8::Object> object,
v8::Local<v8::String> key,
v8::Local<v8::Value> value) {
return IsTrue(object->SetPrivate(
context, v8::Private::ForApi(context->GetIsolate(), key), value));
}
inline bool SetPrivateProperty(v8::Local<v8::Context> context,
v8::Local<v8::Object> object,
const char* key,
v8::Local<v8::Value> value) {
v8::Local<v8::String> v8_key;
return ToV8String(context->GetIsolate(), key, &v8_key) &&
IsTrue(object->SetPrivate(
context, v8::Private::ForApi(context->GetIsolate(), v8_key),
value));
}
// GetProperty() family calls V8::Object::Get() and extracts a value from
// returned MaybeLocal. Returns true on success.
// NOTE: Think about whether you want this or GetPrivateProperty() below.
template <typename Key>
inline bool GetProperty(v8::Local<v8::Context> context,
v8::Local<v8::Object> object,
Key key,
v8::Local<v8::Value>* out) {
return object->Get(context, key).ToLocal(out);
}
inline bool GetProperty(v8::Local<v8::Context> context,
v8::Local<v8::Object> object,
const char* key,
v8::Local<v8::Value>* out) {
v8::Local<v8::String> v8_key;
if (!ToV8String(context->GetIsolate(), key, &v8_key))
return false;
return GetProperty(context, object, v8_key, out);
}
// Wraps v8::Object::GetPrivate(). When possible, prefer this to GetProperty().
inline bool GetPrivateProperty(v8::Local<v8::Context> context,
v8::Local<v8::Object> object,
v8::Local<v8::String> key,
v8::Local<v8::Value>* out) {
return object
->GetPrivate(context, v8::Private::ForApi(context->GetIsolate(), key))
.ToLocal(out);
}
inline bool GetPrivateProperty(v8::Local<v8::Context> context,
v8::Local<v8::Object> object,
const char* key,
v8::Local<v8::Value>* out) {
v8::Local<v8::String> v8_key;
return ToV8String(context->GetIsolate(), key, &v8_key) &&
GetPrivateProperty(context, object, v8_key, out);
}
// GetPropertyUnsafe() family wraps v8::Object::Get(). They crash when an
// exception is thrown.
inline v8::Local<v8::Value> GetPropertyUnsafe(v8::Local<v8::Context> context,
v8::Local<v8::Object> object,
v8::Local<v8::Value> key) {
return object->Get(context, key).ToLocalChecked();
}
inline v8::Local<v8::Value> GetPropertyUnsafe(
v8::Local<v8::Context> context,
v8::Local<v8::Object> object,
const char* key,
v8::NewStringType string_type = v8::NewStringType::kNormal) {
return object->Get(context,
ToV8StringUnsafe(context->GetIsolate(), key, string_type))
.ToLocalChecked();
}
// Wraps v8::Function::Call(). Returns true on success.
inline bool CallFunction(v8::Local<v8::Context> context,
v8::Local<v8::Function> function,
v8::Local<v8::Value> recv,
int argc,
v8::Local<v8::Value> argv[],
v8::Local<v8::Value>* out) {
blink::WebScopedMicrotaskSuppression microtasks_scope;
return function->Call(context, recv, argc, argv).ToLocal(out);
}
} // namespace v8_helpers
} // namespace extensions
#endif // EXTENSIONS_RENDERER_V8_HELPERS_H_
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