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// Copyright 2016 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "cobalt/script/mozjs/conversion_helpers.h"
#include "third_party/mozjs/js/src/jsapi.h"
#include "nb/memory_scope.h"
namespace cobalt {
namespace script {
namespace mozjs {
// JSValue -> std::string
void FromJSValue(JSContext* context, JS::HandleValue value,
int conversion_flags, ExceptionState* exception_state,
std::string* out_string) {
TRACK_MEMORY_SCOPE("Javascript");
DCHECK_EQ(conversion_flags & ~kConversionFlagsString, 0)
<< "Unexpected conversion flags found: ";
if (value.isNull() &&
conversion_flags & kConversionFlagTreatNullAsEmptyString) {
*out_string = "";
return;
}
if (value.isUndefined() &&
conversion_flags & kConversionFlagTreatUndefinedAsEmptyString) {
*out_string = "";
return;
}
JS::RootedString string(context, JS_ValueToString(context, value));
if (!string) {
exception_state->SetSimpleException(kConvertToStringFailed);
return;
}
JSAutoByteString auto_byte_string;
char* utf8_chars = auto_byte_string.encodeUtf8(context, string);
if (!utf8_chars) {
exception_state->SetSimpleException(kConvertToUTF8Failed);
return;
}
*out_string = utf8_chars;
}
// OpaqueHandle -> JSValue
void ToJSValue(JSContext* context,
const OpaqueHandleHolder* opaque_handle_holder,
JS::MutableHandleValue out_value) {
TRACK_MEMORY_SCOPE("Javascript");
JS::RootedObject js_object(context);
if (opaque_handle_holder) {
// Downcast to MozjsObjectHandleHolder so we can get the JS object.
const MozjsObjectHandleHolder* mozjs_object_handle_holder =
base::polymorphic_downcast<const MozjsObjectHandleHolder*>(
opaque_handle_holder);
js_object = mozjs_object_handle_holder->js_object();
}
// OBJECT_TO_JSVAL handles the case where this is NULL.
out_value.set(OBJECT_TO_JSVAL(js_object));
}
// JSValue -> OpaqueHandle
void FromJSValue(JSContext* context, JS::HandleValue value,
int conversion_flags, ExceptionState* exception_state,
MozjsObjectHandleHolder* out_holder) {
TRACK_MEMORY_SCOPE("Javascript");
DCHECK_EQ(conversion_flags & ~kConversionFlagsObject, 0)
<< "Unexpected conversion flags found.";
JS::RootedObject js_object(context);
// https://www.w3.org/TR/WebIDL/#es-object
// 1. If Type(V) is not Object, throw a TypeError
// We'll handle the null case below.
if (!value.isObjectOrNull()) {
exception_state->SetSimpleException(kNotObjectType);
return;
}
js_object = JSVAL_TO_OBJECT(value);
if (!js_object) {
// Set an exception if this is not nullable.
if (!(conversion_flags & kConversionFlagNullable)) {
exception_state->SetSimpleException(kNotNullableType);
}
// Return here even for the non-exception case.
return;
}
DCHECK(js_object);
MozjsGlobalEnvironment* global_environment =
static_cast<MozjsGlobalEnvironment*>(JS_GetContextPrivate(context));
*out_holder = MozjsObjectHandleHolder(value, context,
global_environment->wrapper_factory());
}
// ValueHandle -> JSValue
void ToJSValue(JSContext* context, const ValueHandleHolder* value_handle_holder,
JS::MutableHandleValue out_value) {
TRACK_MEMORY_SCOPE("Javascript");
JS::RootedValue js_value(context);
if (value_handle_holder) {
// Downcast to MozjsValueHandleHolder so we can get the JS object.
const MozjsValueHandleHolder* mozjs_value_handle_holder =
base::polymorphic_downcast<const MozjsValueHandleHolder*>(
value_handle_holder);
js_value = mozjs_value_handle_holder->js_value();
}
// OBJECT_TO_JSVAL handles the case where this is NULL.
out_value.set(js_value);
}
// JSValue -> ValueHandle
void FromJSValue(JSContext* context, JS::HandleValue value,
int conversion_flags, ExceptionState* exception_state,
MozjsValueHandleHolder* out_holder) {
TRACK_MEMORY_SCOPE("Javascript");
DCHECK_EQ(conversion_flags & ~kConversionFlagsObject, 0)
<< "Unexpected conversion flags found.";
MozjsGlobalEnvironment* global_environment =
static_cast<MozjsGlobalEnvironment*>(JS_GetContextPrivate(context));
*out_holder = MozjsValueHandleHolder(value, context,
global_environment->wrapper_factory());
}
} // namespace mozjs
} // namespace script
} // namespace cobalt