Move V8 helper methods to their own class.

This CL extracts the V8 helper methods from the CFXJS_Engine and places
them in a CJS_V8 class which the engine inherits from. This will allow
inheriting the CJS_V8 class into CFXJSE_Engine to share the
helper methods.

Change-Id: I58a7cd7ebac3af303ecbeee84c6940186a0f1dc6
Reviewed-on: https://pdfium-review.googlesource.com/20470
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>

1 files changed, 199 insertions, 0 deletions

diff --git a/fxjs/cjs_v8.cpp b/fxjs/cjs_v8.cpp
new file mode 100644
index 0000000000..67f0cb52b1
--- /dev/null
+++ b/fxjs/cjs_v8.cpp
@@ -0,0 +1,199 @@
+// Copyright 2017 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_v8.h"
+
+CJS_V8::CJS_V8(v8::Isolate* isolate) : m_isolate(isolate) {}
+
+CJS_V8::~CJS_V8() {
+  m_V8PersistentContext.Reset();
+}
+
+v8::Local<v8::Value> CJS_V8::GetObjectProperty(
+    v8::Local<v8::Object> pObj,
+    const WideString& wsPropertyName) {
+  if (pObj.IsEmpty())
+    return v8::Local<v8::Value>();
+  v8::Local<v8::Value> val;
+  if (!pObj->Get(m_isolate->GetCurrentContext(),
+                 NewString(wsPropertyName.AsStringView()))
+           .ToLocal(&val))
+    return v8::Local<v8::Value>();
+  return val;
+}
+
+std::vector<WideString> CJS_V8::GetObjectPropertyNames(
+    v8::Local<v8::Object> pObj) {
+  if (pObj.IsEmpty())
+    return std::vector<WideString>();
+
+  v8::Local<v8::Array> val;
+  v8::Local<v8::Context> context = m_isolate->GetCurrentContext();
+  if (!pObj->GetPropertyNames(context).ToLocal(&val))
+    return std::vector<WideString>();
+
+  std::vector<WideString> result;
+  for (uint32_t i = 0; i < val->Length(); ++i) {
+    result.push_back(ToWideString(val->Get(context, i).ToLocalChecked()));
+  }
+
+  return result;
+}
+
+void CJS_V8::PutObjectProperty(v8::Local<v8::Object> pObj,
+                               const WideString& wsPropertyName,
+                               v8::Local<v8::Value> pPut) {
+  if (pObj.IsEmpty())
+    return;
+  pObj->Set(m_isolate->GetCurrentContext(),
+            NewString(wsPropertyName.AsStringView()), pPut)
+      .FromJust();
+}
+
+v8::Local<v8::Array> CJS_V8::NewArray() {
+  return v8::Array::New(m_isolate);
+}
+
+unsigned CJS_V8::PutArrayElement(v8::Local<v8::Array> pArray,
+                                 unsigned index,
+                                 v8::Local<v8::Value> pValue) {
+  if (pArray.IsEmpty())
+    return 0;
+  if (pArray->Set(m_isolate->GetCurrentContext(), index, pValue).IsNothing())
+    return 0;
+  return 1;
+}
+
+v8::Local<v8::Value> CJS_V8::GetArrayElement(v8::Local<v8::Array> pArray,
+                                             unsigned index) {
+  if (pArray.IsEmpty())
+    return v8::Local<v8::Value>();
+  v8::Local<v8::Value> val;
+  if (!pArray->Get(m_isolate->GetCurrentContext(), index).ToLocal(&val))
+    return v8::Local<v8::Value>();
+  return val;
+}
+
+unsigned CJS_V8::GetArrayLength(v8::Local<v8::Array> pArray) {
+  if (pArray.IsEmpty())
+    return 0;
+  return pArray->Length();
+}
+
+v8::Local<v8::Context> CJS_V8::NewLocalContext() {
+  return v8::Local<v8::Context>::New(m_isolate, m_V8PersistentContext);
+}
+
+v8::Local<v8::Context> CJS_V8::GetPersistentContext() {
+  return m_V8PersistentContext.Get(m_isolate);
+}
+
+v8::Local<v8::Number> CJS_V8::NewNumber(int number) {
+  return v8::Int32::New(m_isolate, number);
+}
+
+v8::Local<v8::Number> CJS_V8::NewNumber(double number) {
+  return v8::Number::New(m_isolate, number);
+}
+
+v8::Local<v8::Number> CJS_V8::NewNumber(float number) {
+  return v8::Number::New(m_isolate, (float)number);
+}
+
+v8::Local<v8::Boolean> CJS_V8::NewBoolean(bool b) {
+  return v8::Boolean::New(m_isolate, b);
+}
+
+v8::Local<v8::String> CJS_V8::NewString(const ByteStringView& str) {
+  v8::Isolate* pIsolate = m_isolate ? m_isolate : v8::Isolate::GetCurrent();
+  return v8::String::NewFromUtf8(pIsolate, str.unterminated_c_str(),
+                                 v8::NewStringType::kNormal, str.GetLength())
+      .ToLocalChecked();
+}
+
+v8::Local<v8::String> CJS_V8::NewString(const WideStringView& str) {
+  // Conversion from pdfium's wchar_t wide-strings to v8's uint16_t
+  // wide-strings isn't handled by v8, so use UTF8 as a common
+  // intermediate format.
+  return NewString(FX_UTF8Encode(str).AsStringView());
+}
+
+v8::Local<v8::Value> CJS_V8::NewNull() {
+  return v8::Null(m_isolate);
+}
+
+v8::Local<v8::Value> CJS_V8::NewUndefined() {
+  return v8::Undefined(m_isolate);
+}
+
+v8::Local<v8::Date> CJS_V8::NewDate(double d) {
+  return v8::Date::New(m_isolate->GetCurrentContext(), d)
+      .ToLocalChecked()
+      .As<v8::Date>();
+}
+
+int CJS_V8::ToInt32(v8::Local<v8::Value> pValue) {
+  if (pValue.IsEmpty())
+    return 0;
+  v8::Local<v8::Context> context = m_isolate->GetCurrentContext();
+  v8::MaybeLocal<v8::Int32> maybe_int32 = pValue->ToInt32(context);
+  if (maybe_int32.IsEmpty())
+    return 0;
+  return maybe_int32.ToLocalChecked()->Value();
+}
+
+bool CJS_V8::ToBoolean(v8::Local<v8::Value> pValue) {
+  if (pValue.IsEmpty())
+    return false;
+  v8::Local<v8::Context> context = m_isolate->GetCurrentContext();
+  v8::MaybeLocal<v8::Boolean> maybe_boolean = pValue->ToBoolean(context);
+  if (maybe_boolean.IsEmpty())
+    return false;
+  return maybe_boolean.ToLocalChecked()->Value();
+}
+
+double CJS_V8::ToDouble(v8::Local<v8::Value> pValue) {
+  if (pValue.IsEmpty())
+    return 0.0;
+  v8::Local<v8::Context> context = m_isolate->GetCurrentContext();
+  v8::MaybeLocal<v8::Number> maybe_number = pValue->ToNumber(context);
+  if (maybe_number.IsEmpty())
+    return 0.0;
+  return maybe_number.ToLocalChecked()->Value();
+}
+
+WideString CJS_V8::ToWideString(v8::Local<v8::Value> pValue) {
+  if (pValue.IsEmpty())
+    return WideString();
+  v8::Local<v8::Context> context = m_isolate->GetCurrentContext();
+  v8::MaybeLocal<v8::String> maybe_string = pValue->ToString(context);
+  if (maybe_string.IsEmpty())
+    return WideString();
+  v8::String::Utf8Value s(maybe_string.ToLocalChecked());
+  return WideString::FromUTF8(ByteStringView(*s, s.length()));
+}
+
+v8::Local<v8::Object> CJS_V8::ToObject(v8::Local<v8::Value> pValue) {
+  if (pValue.IsEmpty() || !pValue->IsObject())
+    return v8::Local<v8::Object>();
+  v8::Local<v8::Context> context = m_isolate->GetCurrentContext();
+  return pValue->ToObject(context).ToLocalChecked();
+}
+
+v8::Local<v8::Array> CJS_V8::ToArray(v8::Local<v8::Value> pValue) {
+  if (pValue.IsEmpty() || !pValue->IsArray())
+    return v8::Local<v8::Array>();
+  v8::Local<v8::Context> context = m_isolate->GetCurrentContext();
+  return v8::Local<v8::Array>::Cast(pValue->ToObject(context).ToLocalChecked());
+}
+
+void CJS_V8::SetConstArray(const WideString& name, v8::Local<v8::Array> array) {
+  m_ConstArrays[name] = v8::Global<v8::Array>(GetIsolate(), array);
+}
+
+v8::Local<v8::Array> CJS_V8::GetConstArray(const WideString& name) {
+  return v8::Local<v8::Array>::New(GetIsolate(), m_ConstArrays[name]);
+}