xfa/fxjse/value.cpp

// 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 "xfa/fxjse/value.h"

#include <math.h>

#include "xfa/fxjse/class.h"
#include "xfa/fxjse/context.h"

FX_BOOL FXJSE_Value_IsUndefined(CFXJSE_Value* pValue) {
  return pValue && pValue->IsUndefined();
}

FX_BOOL FXJSE_Value_IsNull(CFXJSE_Value* pValue) {
  return pValue && pValue->IsNull();
}

FX_BOOL FXJSE_Value_IsBoolean(CFXJSE_Value* pValue) {
  return pValue && pValue->IsBoolean();
}

FX_BOOL FXJSE_Value_IsUTF8String(CFXJSE_Value* pValue) {
  return pValue && pValue->IsString();
}

FX_BOOL FXJSE_Value_IsNumber(CFXJSE_Value* pValue) {
  return pValue && pValue->IsNumber();
}

FX_BOOL FXJSE_Value_IsObject(CFXJSE_Value* pValue) {
  return pValue && pValue->IsObject();
}

FX_BOOL FXJSE_Value_IsArray(CFXJSE_Value* pValue) {
  return pValue && pValue->IsArray();
}

FX_BOOL FXJSE_Value_IsFunction(CFXJSE_Value* pValue) {
  return pValue && pValue->IsFunction();
}

FX_BOOL FXJSE_Value_ToBoolean(CFXJSE_Value* pValue) {
  return pValue->ToBoolean();
}

FX_FLOAT FXJSE_Value_ToFloat(CFXJSE_Value* pValue) {
  return pValue->ToFloat();
}

double FXJSE_Value_ToDouble(CFXJSE_Value* pValue) {
  return pValue->ToDouble();
}

void FXJSE_Value_ToUTF8String(CFXJSE_Value* pValue,
                              CFX_ByteString& szStrOutput) {
  pValue->ToString(szStrOutput);
}

int32_t FXJSE_Value_ToInteger(CFXJSE_Value* pValue) {
  return pValue->ToInteger();
}

void FXJSE_Value_SetUndefined(CFXJSE_Value* pValue) {
  pValue->SetUndefined();
}

void FXJSE_Value_SetNull(CFXJSE_Value* pValue) {
  pValue->SetNull();
}

void FXJSE_Value_SetBoolean(CFXJSE_Value* pValue, FX_BOOL bBoolean) {
  pValue->SetBoolean(bBoolean);
}

void FXJSE_Value_SetUTF8String(CFXJSE_Value* pValue,
                               const CFX_ByteStringC& szString) {
  pValue->SetString(szString);
}

void FXJSE_Value_SetInteger(CFXJSE_Value* pValue, int32_t nInteger) {
  pValue->SetInteger(nInteger);
}

void FXJSE_Value_SetFloat(CFXJSE_Value* pValue, FX_FLOAT fFloat) {
  pValue->SetFloat(fFloat);
}

void FXJSE_Value_SetDouble(CFXJSE_Value* pValue, double dDouble) {
  pValue->SetDouble(dDouble);
}

void FXJSE_Value_SetObject(CFXJSE_Value* pValue,
                           CFXJSE_HostObject* lpObject,
                           CFXJSE_Class* pClass) {
  if (!pClass) {
    ASSERT(!lpObject);
    pValue->SetJSObject();
    return;
  }
  pValue->SetHostObject(lpObject, pClass);
}

void FXJSE_Value_SetArray(CFXJSE_Value* pValue,
                          uint32_t uValueCount,
                          CFXJSE_Value** rgValues) {
  pValue->SetArray(uValueCount, rgValues);
}

void FXJSE_Value_Set(CFXJSE_Value* pValue, CFXJSE_Value* pOriginalValue) {
  ASSERT(pOriginalValue);
  pValue->Assign(pOriginalValue);
}

FX_BOOL FXJSE_Value_GetObjectProp(CFXJSE_Value* pValue,
                                  const CFX_ByteStringC& szPropName,
                                  CFXJSE_Value* pPropValue) {
  ASSERT(pPropValue);
  return pValue->GetObjectProperty(szPropName, pPropValue);
}

FX_BOOL FXJSE_Value_SetObjectProp(CFXJSE_Value* pValue,
                                  const CFX_ByteStringC& szPropName,
                                  CFXJSE_Value* pPropValue) {
  ASSERT(pPropValue);
  return pValue->SetObjectProperty(szPropName, pPropValue);
}

FX_BOOL FXJSE_Value_GetObjectPropByIdx(CFXJSE_Value* pValue,
                                       uint32_t uPropIdx,
                                       CFXJSE_Value* pPropValue) {
  ASSERT(pPropValue);
  return pValue->GetObjectProperty(uPropIdx, pPropValue);
}

FX_BOOL FXJSE_Value_DeleteObjectProp(CFXJSE_Value* pValue,
                                     const CFX_ByteStringC& szPropName) {
  return pValue->DeleteObjectProperty(szPropName);
}

FX_BOOL FXJSE_Value_ObjectHasOwnProp(CFXJSE_Value* pValue,
                                     const CFX_ByteStringC& szPropName,
                                     FX_BOOL bUseTypeGetter) {
  return pValue->HasObjectOwnProperty(szPropName, bUseTypeGetter);
}

FX_BOOL FXJSE_Value_SetObjectOwnProp(CFXJSE_Value* pValue,
                                     const CFX_ByteStringC& szPropName,
                                     CFXJSE_Value* pPropValue) {
  ASSERT(pPropValue);
  return pValue->SetObjectOwnProperty(szPropName, pPropValue);
}

FX_BOOL FXJSE_Value_SetFunctionBind(CFXJSE_Value* pValue,
                                    CFXJSE_Value* pOldFunction,
                                    CFXJSE_Value* pNewThis) {
  ASSERT(pOldFunction && pNewThis);
  return pValue->SetFunctionBind(pOldFunction, pNewThis);
}

void FXJSE_ThrowMessage(const CFX_ByteStringC& utf8Name,
                        const CFX_ByteStringC& utf8Message) {
  v8::Isolate* pIsolate = v8::Isolate::GetCurrent();
  ASSERT(pIsolate);

  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(pIsolate);
  v8::Local<v8::String> hMessage = v8::String::NewFromUtf8(
      pIsolate, utf8Message.c_str(), v8::String::kNormalString,
      utf8Message.GetLength());
  v8::Local<v8::Value> hError;

  if (utf8Name == "RangeError") {
    hError = v8::Exception::RangeError(hMessage);
  } else if (utf8Name == "ReferenceError") {
    hError = v8::Exception::ReferenceError(hMessage);
  } else if (utf8Name == "SyntaxError") {
    hError = v8::Exception::SyntaxError(hMessage);
  } else if (utf8Name == "TypeError") {
    hError = v8::Exception::TypeError(hMessage);
  } else {
    hError = v8::Exception::Error(hMessage);
    if (utf8Name != "Error" && !utf8Name.IsEmpty()) {
      hError.As<v8::Object>()->Set(
          v8::String::NewFromUtf8(pIsolate, "name"),
          v8::String::NewFromUtf8(pIsolate, utf8Name.c_str(),
                                  v8::String::kNormalString,
                                  utf8Name.GetLength()));
    }
  }
  pIsolate->ThrowException(hError);
}

CFXJSE_HostObject* CFXJSE_Value::ToHostObject(CFXJSE_Class* lpClass) const {
  ASSERT(!m_hValue.IsEmpty());

  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
  v8::Local<v8::Value> pValue = v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
  ASSERT(!pValue.IsEmpty());

  if (!pValue->IsObject())
    return nullptr;

  return FXJSE_RetrieveObjectBinding(pValue.As<v8::Object>(), lpClass);
}

V8_INLINE static double FXJSE_ftod(FX_FLOAT fNumber) {
  if (sizeof(FX_FLOAT) != 4) {
    ASSERT(FALSE);
    return fNumber;
  }

  uint32_t nFloatBits = (uint32_t&)fNumber;
  uint8_t nExponent = (uint8_t)(nFloatBits >> 16 >> 7);
  if (nExponent == 0 || nExponent == 255)
    return fNumber;

  int8_t nErrExp = nExponent - 127 - 23;
  if (nErrExp >= 0)
    return fNumber;

  double dwError = pow(2.0, nErrExp), dwErrorHalf = dwError / 2;
  double dNumber = fNumber, dNumberAbs = fabs(fNumber);
  double dNumberAbsMin = dNumberAbs - dwErrorHalf,
         dNumberAbsMax = dNumberAbs + dwErrorHalf;
  int32_t iErrPos = 0;
  if (floor(dNumberAbsMin) == floor(dNumberAbsMax)) {
    dNumberAbsMin = fmod(dNumberAbsMin, 1.0);
    dNumberAbsMax = fmod(dNumberAbsMax, 1.0);
    int32_t iErrPosMin = 1, iErrPosMax = 38;
    do {
      int32_t iMid = (iErrPosMin + iErrPosMax) / 2;
      double dPow = pow(10.0, iMid);
      if (floor(dNumberAbsMin * dPow) == floor(dNumberAbsMax * dPow)) {
        iErrPosMin = iMid + 1;
      } else {
        iErrPosMax = iMid;
      }
    } while (iErrPosMin < iErrPosMax);
    iErrPos = iErrPosMax;
  }
  double dPow = pow(10.0, iErrPos);
  return fNumber < 0 ? ceil(dNumber * dPow - 0.5) / dPow
                     : floor(dNumber * dPow + 0.5) / dPow;
}

void CFXJSE_Value::SetFloat(FX_FLOAT fFloat) {
  CFXJSE_ScopeUtil_IsolateHandle scope(m_pIsolate);
  v8::Local<v8::Value> pValue = v8::Number::New(m_pIsolate, FXJSE_ftod(fFloat));
  m_hValue.Reset(m_pIsolate, pValue);
}

void CFXJSE_Value::SetHostObject(CFXJSE_HostObject* lpObject,
                                 CFXJSE_Class* lpClass) {
  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
  ASSERT(lpClass);
  v8::Local<v8::FunctionTemplate> hClass =
      v8::Local<v8::FunctionTemplate>::New(m_pIsolate, lpClass->m_hTemplate);
  v8::Local<v8::Object> hObject = hClass->InstanceTemplate()->NewInstance();
  FXJSE_UpdateObjectBinding(hObject, lpObject);
  m_hValue.Reset(m_pIsolate, hObject);
}

void CFXJSE_Value::SetArray(uint32_t uValueCount, CFXJSE_Value** rgValues) {
  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
  v8::Local<v8::Array> hArrayObject = v8::Array::New(m_pIsolate, uValueCount);
  if (rgValues) {
    for (uint32_t i = 0; i < uValueCount; i++) {
      if (rgValues[i]) {
        hArrayObject->Set(i, v8::Local<v8::Value>::New(
                                 m_pIsolate, rgValues[i]->DirectGetValue()));
      }
    }
  }
  m_hValue.Reset(m_pIsolate, hArrayObject);
}

void CFXJSE_Value::SetDate(double dDouble) {
  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
  v8::Local<v8::Value> hDate = v8::Date::New(m_pIsolate, dDouble);
  m_hValue.Reset(m_pIsolate, hDate);
}

FX_BOOL CFXJSE_Value::SetObjectProperty(const CFX_ByteStringC& szPropName,
                                        CFXJSE_Value* lpPropValue) {
  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
  v8::Local<v8::Value> hObject =
      v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
  if (!hObject->IsObject())
    return FALSE;

  v8::Local<v8::Value> hPropValue =
      v8::Local<v8::Value>::New(m_pIsolate, lpPropValue->DirectGetValue());
  return (FX_BOOL)hObject.As<v8::Object>()->Set(
      v8::String::NewFromUtf8(m_pIsolate, szPropName.c_str(),
                              v8::String::kNormalString,
                              szPropName.GetLength()),
      hPropValue);
}

FX_BOOL CFXJSE_Value::GetObjectProperty(const CFX_ByteStringC& szPropName,
                                        CFXJSE_Value* lpPropValue) {
  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
  v8::Local<v8::Value> hObject =
      v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
  if (!hObject->IsObject())
    return FALSE;

  v8::Local<v8::Value> hPropValue =
      hObject.As<v8::Object>()->Get(v8::String::NewFromUtf8(
          m_pIsolate, szPropName.c_str(), v8::String::kNormalString,
          szPropName.GetLength()));
  lpPropValue->ForceSetValue(hPropValue);
  return TRUE;
}

FX_BOOL CFXJSE_Value::SetObjectProperty(uint32_t uPropIdx,
                                        CFXJSE_Value* lpPropValue) {
  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
  v8::Local<v8::Value> hObject =
      v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
  if (!hObject->IsObject())
    return FALSE;

  v8::Local<v8::Value> hPropValue =
      v8::Local<v8::Value>::New(m_pIsolate, lpPropValue->DirectGetValue());
  return (FX_BOOL)hObject.As<v8::Object>()->Set(uPropIdx, hPropValue);
}

FX_BOOL CFXJSE_Value::GetObjectProperty(uint32_t uPropIdx,
                                        CFXJSE_Value* lpPropValue) {
  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
  v8::Local<v8::Value> hObject =
      v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
  if (!hObject->IsObject())
    return FALSE;

  v8::Local<v8::Value> hPropValue = hObject.As<v8::Object>()->Get(uPropIdx);
  lpPropValue->ForceSetValue(hPropValue);
  return TRUE;
}

FX_BOOL CFXJSE_Value::DeleteObjectProperty(const CFX_ByteStringC& szPropName) {
  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
  v8::Local<v8::Value> hObject =
      v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
  if (!hObject->IsObject())
    return FALSE;

  hObject.As<v8::Object>()->Delete(v8::String::NewFromUtf8(
      m_pIsolate, szPropName.c_str(), v8::String::kNormalString,
      szPropName.GetLength()));
  return TRUE;
}

FX_BOOL CFXJSE_Value::HasObjectOwnProperty(const CFX_ByteStringC& szPropName,
                                           FX_BOOL bUseTypeGetter) {
  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
  v8::Local<v8::Value> hObject =
      v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
  if (!hObject->IsObject())
    return FALSE;

  v8::Local<v8::String> hKey = v8::String::NewFromUtf8(
      m_pIsolate, szPropName.c_str(), v8::String::kNormalString,
      szPropName.GetLength());
  return hObject.As<v8::Object>()->HasRealNamedProperty(hKey) ||
         (bUseTypeGetter &&
          hObject.As<v8::Object>()
              ->HasOwnProperty(m_pIsolate->GetCurrentContext(), hKey)
              .FromMaybe(false));
}

FX_BOOL CFXJSE_Value::SetObjectOwnProperty(const CFX_ByteStringC& szPropName,
                                           CFXJSE_Value* lpPropValue) {
  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
  v8::Local<v8::Value> hObject =
      v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
  if (!hObject->IsObject())
    return FALSE;

  v8::Local<v8::Value> pValue =
      v8::Local<v8::Value>::New(m_pIsolate, lpPropValue->m_hValue);
  return hObject.As<v8::Object>()
      ->DefineOwnProperty(
          m_pIsolate->GetCurrentContext(),
          v8::String::NewFromUtf8(m_pIsolate, szPropName.c_str(),
                                  v8::String::kNormalString,
                                  szPropName.GetLength()),
          pValue)
      .FromMaybe(false);
}

FX_BOOL CFXJSE_Value::SetFunctionBind(CFXJSE_Value* lpOldFunction,
                                      CFXJSE_Value* lpNewThis) {
  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
  v8::Local<v8::Value> rgArgs[2];
  v8::Local<v8::Value> hOldFunction =
      v8::Local<v8::Value>::New(m_pIsolate, lpOldFunction->DirectGetValue());
  if (hOldFunction.IsEmpty() || !hOldFunction->IsFunction())
    return FALSE;

  rgArgs[0] = hOldFunction;
  v8::Local<v8::Value> hNewThis =
      v8::Local<v8::Value>::New(m_pIsolate, lpNewThis->DirectGetValue());
  if (hNewThis.IsEmpty())
    return FALSE;

  rgArgs[1] = hNewThis;
  v8::Local<v8::String> hBinderFuncSource =
      v8::String::NewFromUtf8(m_pIsolate,
                              "(function (oldfunction, newthis) { return "
                              "oldfunction.bind(newthis); })");
  v8::Local<v8::Function> hBinderFunc =
      v8::Script::Compile(hBinderFuncSource)->Run().As<v8::Function>();
  v8::Local<v8::Value> hBoundFunction =
      hBinderFunc->Call(m_pIsolate->GetCurrentContext()->Global(), 2, rgArgs);
  if (hBoundFunction.IsEmpty() || !hBoundFunction->IsFunction())
    return FALSE;

  m_hValue.Reset(m_pIsolate, hBoundFunction);
  return TRUE;
}

#define FXJSE_INVALID_PTR ((void*)(intptr_t)-1)
FX_BOOL CFXJSE_Value::Call(CFXJSE_Value* lpReceiver,
                           CFXJSE_Value* lpRetValue,
                           uint32_t nArgCount,
                           CFXJSE_Value** lpArgs) {
  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
  v8::Local<v8::Value> hFunctionValue =
      v8::Local<v8::Value>::New(m_pIsolate, DirectGetValue());
  v8::Local<v8::Object> hFunctionObject =
      !hFunctionValue.IsEmpty() && hFunctionValue->IsObject()
          ? hFunctionValue.As<v8::Object>()
          : v8::Local<v8::Object>();

  v8::TryCatch trycatch(m_pIsolate);
  if (hFunctionObject.IsEmpty() || !hFunctionObject->IsCallable()) {
    if (lpRetValue)
      lpRetValue->ForceSetValue(FXJSE_CreateReturnValue(m_pIsolate, trycatch));
    return FALSE;
  }

  v8::Local<v8::Value> hReturnValue;
  v8::Local<v8::Value>* lpLocalArgs = NULL;
  if (nArgCount) {
    lpLocalArgs = FX_Alloc(v8::Local<v8::Value>, nArgCount);
    for (uint32_t i = 0; i < nArgCount; i++) {
      new (lpLocalArgs + i) v8::Local<v8::Value>;
      CFXJSE_Value* lpArg = lpArgs[i];
      if (lpArg) {
        lpLocalArgs[i] =
            v8::Local<v8::Value>::New(m_pIsolate, lpArg->DirectGetValue());
      }
      if (lpLocalArgs[i].IsEmpty()) {
        lpLocalArgs[i] = v8::Undefined(m_pIsolate);
      }
    }
  }

  FX_BOOL bRetValue = TRUE;
  if (lpReceiver == FXJSE_INVALID_PTR) {
    v8::MaybeLocal<v8::Value> maybe_retvalue =
        hFunctionObject->CallAsConstructor(m_pIsolate->GetCurrentContext(),
                                           nArgCount, lpLocalArgs);
    hReturnValue = maybe_retvalue.FromMaybe(v8::Local<v8::Value>());
  } else {
    v8::Local<v8::Value> hReceiver;
    if (lpReceiver) {
      hReceiver =
          v8::Local<v8::Value>::New(m_pIsolate, lpReceiver->DirectGetValue());
    }
    if (hReceiver.IsEmpty() || !hReceiver->IsObject())
      hReceiver = v8::Object::New(m_pIsolate);

    v8::MaybeLocal<v8::Value> maybe_retvalue = hFunctionObject->CallAsFunction(
        m_pIsolate->GetCurrentContext(), hReceiver, nArgCount, lpLocalArgs);
    hReturnValue = maybe_retvalue.FromMaybe(v8::Local<v8::Value>());
  }

  if (trycatch.HasCaught()) {
    hReturnValue = FXJSE_CreateReturnValue(m_pIsolate, trycatch);
    bRetValue = FALSE;
  }

  if (lpRetValue)
    lpRetValue->ForceSetValue(hReturnValue);

  if (lpLocalArgs) {
    for (uint32_t i = 0; i < nArgCount; i++)
      lpLocalArgs[i].~Local();
    FX_Free(lpLocalArgs);
  }
  return bRetValue;
}