text: // Copyright 2014 PDFium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
  
  #include "fxjs/cjs_runtime.h"
  
  #include <algorithm>
  
  #include "fpdfsdk/cpdfsdk_formfillenvironment.h"
  #include "fxjs/cfx_globaldata.h"
  #include "fxjs/cjs_annot.h"
  #include "fxjs/cjs_app.h"
  #include "fxjs/cjs_border.h"
  #include "fxjs/cjs_color.h"
  #include "fxjs/cjs_console.h"
  #include "fxjs/cjs_display.h"
  #include "fxjs/cjs_document.h"
  #include "fxjs/cjs_event.h"
  #include "fxjs/cjs_event_context.h"
  #include "fxjs/cjs_eventrecorder.h"
  #include "fxjs/cjs_field.h"
  #include "fxjs/cjs_font.h"
  #include "fxjs/cjs_global.h"
  #include "fxjs/cjs_globalarrays.h"
  #include "fxjs/cjs_globalconsts.h"
  #include "fxjs/cjs_highlight.h"
  #include "fxjs/cjs_icon.h"
  #include "fxjs/cjs_object.h"
  #include "fxjs/cjs_position.h"
  #include "fxjs/cjs_publicmethods.h"
  #include "fxjs/cjs_scalehow.h"
  #include "fxjs/cjs_scalewhen.h"
  #include "fxjs/cjs_style.h"
  #include "fxjs/cjs_timerobj.h"
  #include "fxjs/cjs_util.h"
  #include "fxjs/cjs_zoomtype.h"
  #include "fxjs/fxv8.h"
  #include "fxjs/js_define.h"
  
  CJS_Runtime::CJS_Runtime(CPDFSDK_FormFillEnvironment* pFormFillEnv)
      : m_pFormFillEnv(pFormFillEnv) {
    v8::Isolate* pIsolate = nullptr;
    IPDF_JSPLATFORM* pPlatform = m_pFormFillEnv->GetFormFillInfo()->m_pJsPlatform;
    if (pPlatform->version <= 2) {
      // Backwards compatibility - JS now initialized earlier in more modern
      // JSPLATFORM versions.
      unsigned int embedderDataSlot = 0;
      v8::Isolate* pExternalIsolate = nullptr;
      if (pPlatform->version == 2) {
        pExternalIsolate = static_cast<v8::Isolate*>(pPlatform->m_isolate);
        embedderDataSlot = pPlatform->m_v8EmbedderSlot;
      }
      FXJS_Initialize(embedderDataSlot, pExternalIsolate);
    }
    m_isolateManaged = FXJS_GetIsolate(&pIsolate);
    SetIsolate(pIsolate);
  
    v8::Isolate::Scope isolate_scope(pIsolate);
    v8::HandleScope handle_scope(pIsolate);
    if (m_isolateManaged || FXJS_GlobalIsolateRefCount() == 0)
      DefineJSObjects();
  
    ScopedEventContext pContext(this);
    InitializeEngine();
    SetFormFillEnvToDocument();
  }
  
  CJS_Runtime::~CJS_Runtime() {
    NotifyObservers();
    ReleaseEngine();
    if (m_isolateManaged)
      DisposeIsolate();
  }
  
  void CJS_Runtime::DefineJSObjects() {
    v8::Isolate::Scope isolate_scope(GetIsolate());
    v8::HandleScope handle_scope(GetIsolate());
    v8::Local<v8::Context> context = v8::Context::New(GetIsolate());
    v8::Context::Scope context_scope(context);
  
    // The call order determines the "ObjDefID" assigned to each class.
    // ObjDefIDs 0 - 2
    CJS_Border::DefineJSObjects(this);
    CJS_Display::DefineJSObjects(this);
    CJS_Font::DefineJSObjects(this);
  
    // ObjDefIDs 3 - 5
    CJS_Highlight::DefineJSObjects(this);
    CJS_Position::DefineJSObjects(this);
    CJS_ScaleHow::DefineJSObjects(this);
  
    // ObjDefIDs 6 - 8
    CJS_ScaleWhen::DefineJSObjects(this);
    CJS_Style::DefineJSObjects(this);
    CJS_Zoomtype::DefineJSObjects(this);
  
    // ObjDefIDs 9 - 11
    CJS_App::DefineJSObjects(this);
    CJS_Color::DefineJSObjects(this);
    CJS_Console::DefineJSObjects(this);
  
    // ObjDefIDs 12 - 14
    CJS_Document::DefineJSObjects(this);
    CJS_Event::DefineJSObjects(this);
    CJS_Field::DefineJSObjects(this);
  
    // ObjDefIDs 15 - 17
    CJS_Global::DefineJSObjects(this);
    CJS_Icon::DefineJSObjects(this);
    CJS_Util::DefineJSObjects(this);
  
    // ObjDefIDs 18 - 20 (these can't fail, return void).
    CJS_PublicMethods::DefineJSObjects(this);
    CJS_GlobalConsts::DefineJSObjects(this);
    CJS_GlobalArrays::DefineJSObjects(this);
  
    // ObjDefIDs 21 - 22.
    CJS_TimerObj::DefineJSObjects(this);
    CJS_Annot::DefineJSObjects(this);
  }
  
  IJS_EventContext* CJS_Runtime::NewEventContext() {
    m_EventContextArray.push_back(std::make_unique<CJS_EventContext>(this));
    return m_EventContextArray.back().get();
  }
  
  void CJS_Runtime::ReleaseEventContext(IJS_EventContext* pContext) {
    ASSERT(pContext == m_EventContextArray.back().get());
    m_EventContextArray.pop_back();
  }
  
  CJS_EventContext* CJS_Runtime::GetCurrentEventContext() const {
    return m_EventContextArray.empty() ? nullptr
                                       : m_EventContextArray.back().get();
  }
  
  TimerHandlerIface* CJS_Runtime::GetTimerHandler() const {
    return m_pFormFillEnv ? m_pFormFillEnv->GetTimerHandler() : nullptr;
  }
  
  void CJS_Runtime::SetFormFillEnvToDocument() {
    v8::Isolate::Scope isolate_scope(GetIsolate());
    v8::HandleScope handle_scope(GetIsolate());
    v8::Local<v8::Context> context = GetV8Context();
    v8::Context::Scope context_scope(context);
  
    v8::Local<v8::Object> pThis = GetThisObj();
    if (pThis.IsEmpty())
      return;
  
    auto pJSDocument = JSGetObject<CJS_Document>(pThis);
    if (!pJSDocument)
      return;
  
    pJSDocument->SetFormFillEnv(m_pFormFillEnv.Get());
  }
  
  CPDFSDK_FormFillEnvironment* CJS_Runtime::GetFormFillEnv() const {
    return m_pFormFillEnv.Get();
  }
  
  Optional<IJS_Runtime::JS_Error> CJS_Runtime::ExecuteScript(
      const WideString& script) {
    return Execute(script);
  }
  
  bool CJS_Runtime::AddEventToSet(const FieldEvent& event) {
    return m_FieldEventSet.insert(event).second;
  }
  
  void CJS_Runtime::RemoveEventFromSet(const FieldEvent& event) {
    m_FieldEventSet.erase(event);
  }
  
  CJS_Runtime* CJS_Runtime::AsCJSRuntime() {
    return this;
  }
  
  bool CJS_Runtime::GetValueByNameFromGlobalObject(ByteStringView utf8Name,
                                                   v8::Local<v8::Value>* pValue) {
    v8::Isolate::Scope isolate_scope(GetIsolate());
    v8::Local<v8::Context> context = GetV8Context();
    v8::Context::Scope context_scope(context);
    v8::Local<v8::String> str = fxv8::NewStringHelper(GetIsolate(), utf8Name);
    v8::MaybeLocal<v8::Value> maybe_propvalue =
        context->Global()->Get(context, str);
    if (maybe_propvalue.IsEmpty())
      return false;
  
    *pValue = maybe_propvalue.ToLocalChecked();
    return true;
  }
  
  bool CJS_Runtime::SetValueByNameInGlobalObject(ByteStringView utf8Name,
                                                 v8::Local<v8::Value> pValue) {
    if (utf8Name.IsEmpty() || pValue.IsEmpty())
      return false;
  
    v8::Isolate* pIsolate = GetIsolate();
    v8::Isolate::Scope isolate_scope(pIsolate);
    v8::Local<v8::Context> context = GetV8Context();
    v8::Context::Scope context_scope(context);
    v8::Local<v8::String> str = fxv8::NewStringHelper(pIsolate, utf8Name);
    v8::Maybe<bool> result = context->Global()->Set(context, str, pValue);
    return result.IsJust() && result.FromJust();
  }
  
  v8::Local<v8::Value> CJS_Runtime::MaybeCoerceToNumber(
      v8::Local<v8::Value> value) {
    bool bAllowNaN = false;
    if (value->IsString()) {
      ByteString bstr = ToWideString(value).ToDefANSI();
      if (bstr.IsEmpty())
        return value;
      if (bstr == "NaN")
        bAllowNaN = true;
    }
  
    v8::Isolate* pIsolate = GetIsolate();
    v8::TryCatch try_catch(pIsolate);
    v8::MaybeLocal<v8::Number> maybeNum =
        value->ToNumber(pIsolate->GetCurrentContext());
    if (maybeNum.IsEmpty())
      return value;
  
    v8::Local<v8::Number> num = maybeNum.ToLocalChecked();
    if (std::isnan(num->Value()) && !bAllowNaN)
      return value;
  
    return num;
  }
  