third_party/WebKit/Source/bindings/core/v8/JSONValuesForV8.cpp

// Copyright 2016 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.

#include "bindings/core/v8/JSONValuesForV8.h"

#include "bindings/core/v8/ExceptionState.h"
#include "bindings/core/v8/ScriptState.h"
#include "bindings/core/v8/V8Binding.h"

namespace blink {

static String coreString(v8::Local<v8::String> v8String)
{
    int length = v8String->Length();
    UChar* buffer;
    String result = String::createUninitialized(length, buffer);
    v8String->Write(reinterpret_cast<uint16_t*>(buffer), 0, length);
    return result;
}

PassRefPtr<JSONValue> toJSONValue(v8::Local<v8::Context> context, v8::Local<v8::Value> value, int maxDepth)
{
    if (value.IsEmpty()) {
        ASSERT_NOT_REACHED();
        return nullptr;
    }

    if (!maxDepth)
        return nullptr;
    maxDepth--;

    if (value->IsNull() || value->IsUndefined())
        return JSONValue::null();
    if (value->IsBoolean())
        return JSONBasicValue::create(value.As<v8::Boolean>()->Value());
    if (value->IsNumber())
        return JSONBasicValue::create(value.As<v8::Number>()->Value());
    if (value->IsString())
        return JSONString::create(coreString(value.As<v8::String>()));
    if (value->IsArray()) {
        v8::Local<v8::Array> array = value.As<v8::Array>();
        RefPtr<JSONArray> inspectorArray = JSONArray::create();
        uint32_t length = array->Length();
        for (uint32_t i = 0; i < length; i++) {
            v8::Local<v8::Value> value;
            if (!array->Get(context, i).ToLocal(&value))
                return nullptr;
            RefPtr<JSONValue> element = toJSONValue(context, value, maxDepth);
            if (!element)
                return nullptr;
            inspectorArray->pushValue(element);
        }
        return inspectorArray;
    }
    if (value->IsObject()) {
        RefPtr<JSONObject> jsonObject = JSONObject::create();
        v8::Local<v8::Object> object = v8::Local<v8::Object>::Cast(value);
        v8::Local<v8::Array> propertyNames;
        if (!object->GetPropertyNames(context).ToLocal(&propertyNames))
            return nullptr;
        uint32_t length = propertyNames->Length();
        for (uint32_t i = 0; i < length; i++) {
            v8::Local<v8::Value> name;
            if (!propertyNames->Get(context, i).ToLocal(&name))
                return nullptr;
            // FIXME(yurys): v8::Object should support GetOwnPropertyNames
            if (name->IsString()) {
                v8::Maybe<bool> hasRealNamedProperty = object->HasRealNamedProperty(context, v8::Local<v8::String>::Cast(name));
                if (!hasRealNamedProperty.IsJust() || !hasRealNamedProperty.FromJust())
                    continue;
            }
            v8::Local<v8::String> propertyName;
            if (!name->ToString(context).ToLocal(&propertyName))
                continue;
            v8::Local<v8::Value> property;
            if (!object->Get(context, name).ToLocal(&property))
                return nullptr;
            RefPtr<JSONValue> propertyValue = toJSONValue(context, property, maxDepth);
            if (!propertyValue)
                return nullptr;
            jsonObject->setValue(coreString(propertyName), propertyValue);
        }
        return jsonObject;
    }
    ASSERT_NOT_REACHED();
    return nullptr;
}

v8::Local<v8::Value> fromJSONString(ScriptState* scriptState, const String& stringifiedJSON, ExceptionState& exceptionState)
{
    v8::Isolate* isolate = scriptState->isolate();
    v8::Local<v8::Value> parsed;
    v8::TryCatch tryCatch(isolate);
    if (!v8Call(v8::JSON::Parse(isolate, v8String(isolate, stringifiedJSON)), parsed, tryCatch)) {
        if (tryCatch.HasCaught())
            exceptionState.rethrowV8Exception(tryCatch.Exception());
    }

    return parsed;
}

} // namespace blink