Allow compiling PDFium without V8.

fpdfsdk/src/javascript/JS_Runtime_Stub.cpp

Index: fpdfsdk/src/javascript/JS_Runtime_Stub.cpp
diff --git a/fpdfsdk/src/javascript/JS_Runtime_Stub.cpp b/fpdfsdk/src/javascript/JS_Runtime_Stub.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..07940cd8570bb725d46ccb6ffa7a241be94ea215
--- /dev/null
+++ b/fpdfsdk/src/javascript/JS_Runtime_Stub.cpp
@@ -0,0 +1,167 @@
+// 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 "../../include/fsdk_mgr.h"  // For CPDFDoc_Environment.
+#include "../../include/javascript/IJavaScript.h"
+
+#include <algorithm>
+#include <vector>
+
+class CJS_ContextStub final : public IJS_Context {
+ public:
+  CJS_ContextStub(IJS_Runtime* pRuntime) : m_pRuntime(pRuntime) {}
+  ~CJS_ContextStub() override {}
+
+  // IJS_Context:
+  FX_BOOL RunScript(const CFX_WideString& script,
+                    CFX_WideString& info) override {
+    return FALSE;
+  }
+
+  void OnApp_Init() override {}
+  void OnDoc_Open(CPDFSDK_Document* pDoc,
+                  const CFX_WideString& strTargetName) override {}
+  void OnDoc_WillPrint(CPDFSDK_Document* pDoc) override {}
+  void OnDoc_DidPrint(CPDFSDK_Document* pDoc) override {}
+  void OnDoc_WillSave(CPDFSDK_Document* pDoc) override {}
+  void OnDoc_DidSave(CPDFSDK_Document* pDoc) override {}
+  void OnDoc_WillClose(CPDFSDK_Document* pDoc) override {}
+  void OnPage_Open(CPDFSDK_Document* pTarget) override {}
+  void OnPage_Close(CPDFSDK_Document* pTarget) override {}
+  void OnPage_InView(CPDFSDK_Document* pTarget) override {}
+  void OnPage_OutView(CPDFSDK_Document* pTarget) override {}
+  void OnField_MouseDown(FX_BOOL bModifier,
+                         FX_BOOL bShift,
+                         CPDF_FormField* pTarget) override {}
+  void OnField_MouseEnter(FX_BOOL bModifier,
+                          FX_BOOL bShift,
+                          CPDF_FormField* pTarget) override {}
+  void OnField_MouseExit(FX_BOOL bModifier,
+                         FX_BOOL bShift,
+                         CPDF_FormField* pTarget) override {}
+  void OnField_MouseUp(FX_BOOL bModifier,
+                       FX_BOOL bShift,
+                       CPDF_FormField* pTarget) override {}
+  void OnField_Focus(FX_BOOL bModifier,
+                     FX_BOOL bShift,
+                     CPDF_FormField* pTarget,
+                     const CFX_WideString& Value) override {}
+  void OnField_Blur(FX_BOOL bModifier,
+                    FX_BOOL bShift,
+                    CPDF_FormField* pTarget,
+                    const CFX_WideString& Value) override {}
+  void OnField_Calculate(CPDF_FormField* pSource,
+                         CPDF_FormField* pTarget,
+                         CFX_WideString& Value,
+                         FX_BOOL& bRc) override {}
+  void OnField_Format(CPDF_FormField* pTarget,
+                      CFX_WideString& Value,
+                      FX_BOOL bWillCommit) override {}
+  void OnField_Keystroke(CFX_WideString& strChange,
+                         const CFX_WideString& strChangeEx,
+                         FX_BOOL KeyDown,
+                         FX_BOOL bModifier,
+                         int& nSelEnd,
+                         int& nSelStart,
+                         FX_BOOL bShift,
+                         CPDF_FormField* pTarget,
+                         CFX_WideString& Value,
+                         FX_BOOL bWillCommit,
+                         FX_BOOL bFieldFull,
+                         FX_BOOL& bRc) override {}
+  void OnField_Validate(CFX_WideString& strChange,
+                        const CFX_WideString& strChangeEx,
+                        FX_BOOL bKeyDown,
+                        FX_BOOL bModifier,
+                        FX_BOOL bShift,
+                        CPDF_FormField* pTarget,
+                        CFX_WideString& Value,
+                        FX_BOOL& bRc) override {}
+  void OnScreen_Focus(FX_BOOL bModifier,
+                      FX_BOOL bShift,
+                      CPDFSDK_Annot* pScreen) override {}
+  void OnScreen_Blur(FX_BOOL bModifier,
+                     FX_BOOL bShift,
+                     CPDFSDK_Annot* pScreen) override {}
+  void OnScreen_Open(FX_BOOL bModifier,
+                     FX_BOOL bShift,
+                     CPDFSDK_Annot* pScreen) override {}
+  void OnScreen_Close(FX_BOOL bModifier,
+                      FX_BOOL bShift,
+                      CPDFSDK_Annot* pScreen) override {}
+  void OnScreen_MouseDown(FX_BOOL bModifier,
+                          FX_BOOL bShift,
+                          CPDFSDK_Annot* pScreen) override {}
+  void OnScreen_MouseUp(FX_BOOL bModifier,
+                        FX_BOOL bShift,
+                        CPDFSDK_Annot* pScreen) override {}
+  void OnScreen_MouseEnter(FX_BOOL bModifier,
+                           FX_BOOL bShift,
+                           CPDFSDK_Annot* pScreen) override {}
+  void OnScreen_MouseExit(FX_BOOL bModifier,
+                          FX_BOOL bShift,
+                          CPDFSDK_Annot* pScreen) override {}
+  void OnScreen_InView(FX_BOOL bModifier,
+                       FX_BOOL bShift,
+                       CPDFSDK_Annot* pScreen) override {}
+  void OnScreen_OutView(FX_BOOL bModifier,
+                        FX_BOOL bShift,
+                        CPDFSDK_Annot* pScreen) override {}
+  void OnBookmark_MouseUp(CPDF_Bookmark* pBookMark) override {}
+  void OnLink_MouseUp(CPDFSDK_Document* pTarget) override {}
+  void OnMenu_Exec(CPDFSDK_Document* pTarget, const CFX_WideString&) override {}
+  void OnBatchExec(CPDFSDK_Document* pTarget) override {}
+  void OnConsole_Exec() override {}
+  void OnExternal_Exec() override {}
+  void EnableMessageBox(FX_BOOL bEnable) override {}
+
+ protected:
+  IJS_Runtime* m_pRuntime;

[David Lattimore, 2015/10/08 21:11:54]

This doesn't seem to be used.

[Tom Sepez, 2015/10/08 21:25:33]

removed.

+};
+
+class CJS_RuntimeStub final : public IJS_Runtime {
+ public:
+  CJS_RuntimeStub() : m_pDoc(nullptr) {}
+  ~CJS_RuntimeStub() override {}
+
+  IJS_Context* NewContext() override {
+    m_ContextStack.push_back(new CJS_ContextStub(this));
+    return GetCurrentContext();
+  }
+
+  IJS_Context* GetCurrentContext() override {
+    return m_ContextStack.size() ? m_ContextStack.back() : nullptr;
+  }
+
+  void ReleaseContext(IJS_Context* pContext) override {
+    CJS_ContextStub* pContextStub = static_cast<CJS_ContextStub*>(pContext);
+    for (auto it = m_ContextStack.begin(); it != m_ContextStack.end(); ++it) {
+      if (*it == pContextStub) {
+        m_ContextStack.erase(it);
+        delete pContextStub;
+        break;
+      }
+    }
+  }
+
+  void SetReaderDocument(CPDFSDK_Document* pReaderDoc) override {
+    m_pDoc = pReaderDoc;
+  }
+  CPDFSDK_Document* GetReaderDocument() override { return m_pDoc; }
+
+ protected:
+  CPDFSDK_Document* m_pDoc;
+  std::vector<CJS_ContextStub*> m_ContextStack;

[David Lattimore, 2015/10/08 21:11:54]

It looks like you could have a single CJS_ContextStub instead of a stack of them
since they appear to be stateless. The only caveat would be if the contexts get
used as keys in a map.

[Tom Sepez, 2015/10/08 21:25:33]

Yes, but the question remains when to delete it.  We'd have to ref-count it or
some such.  

[David Lattimore, 2015/10/08 21:29:42]

It couldn't just be owned by CJS_RuntimeStub?

+};
+
+// static
+void IJS_Runtime::Initialize(unsigned int slot, void* isolate) {
+}
+
+// static
+IJS_Runtime* IJS_Runtime::Create(CPDFDoc_Environment* pEnv) {
+  return new CJS_RuntimeStub;
+}