Rename GetTemplateNode to GetTemplateNodeIfExists

This CL makes it explicit that GetTemplateNodeIfExists can return
nullptr. Various call sites are updated as needed.

Change-Id: If6edd5962b59e7e4ce3dbe9bbdc957783cf76abe
Reviewed-on: https://pdfium-review.googlesource.com/22678
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

9 files changed, 48 insertions, 22 deletions

diff --git a/fxjs/xfa/cjx_object.cpp b/fxjs/xfa/cjx_object.cpp
index a1d9dafd7b..7b1bb3cbef 100644
--- a/fxjs/xfa/cjx_object.cpp
+++ b/fxjs/xfa/cjx_object.cpp
@@ -972,7 +972,7 @@ void CJX_Object::SetMapModuleValue(void* pKey, void* pValue) {
 
 bool CJX_Object::GetMapModuleValue(void* pKey, void*& pValue) {
   for (CXFA_Node* pNode = ToNode(GetXFAObject()); pNode;
-       pNode = pNode->GetTemplateNode()) {
+       pNode = pNode->GetTemplateNodeIfExists()) {
     XFA_MAPMODULEDATA* pModule = pNode->JSObject()->GetMapModuleData();
     if (pModule) {
       auto it = pModule->m_ValueMap.find(pKey);
@@ -1032,7 +1032,7 @@ bool CJX_Object::GetMapModuleBuffer(void* pKey,
                                     bool bProtoAlso) const {
   XFA_MAPDATABLOCK* pBuffer = nullptr;
   for (const CXFA_Node* pNode = ToNode(GetXFAObject()); pNode;
-       pNode = pNode->GetTemplateNode()) {
+       pNode = pNode->GetTemplateNodeIfExists()) {
     XFA_MAPMODULEDATA* pModule = pNode->JSObject()->GetMapModuleData();
     if (pModule) {
       auto it = pModule->m_BufferMap.find(pKey);
diff --git a/xfa/fxfa/cxfa_ffwidgethandler.cpp b/xfa/fxfa/cxfa_ffwidgethandler.cpp
index 857a3c6687..87a013cee2 100644
--- a/xfa/fxfa/cxfa_ffwidgethandler.cpp
+++ b/xfa/fxfa/cxfa_ffwidgethandler.cpp
@@ -254,7 +254,11 @@ CXFA_FFWidget* CXFA_FFWidgetHandler::CreateWidget(CXFA_FFWidget* hParent,
   if (!pNewFormItem)
     return nullptr;
 
-  pNewFormItem->GetTemplateNode()->SetFlag(XFA_NodeFlag_Initialized, true);
+  CXFA_Node* templateNode = pNewFormItem->GetTemplateNodeIfExists();
+  if (!templateNode)
+    return nullptr;
+
+  templateNode->SetFlag(XFA_NodeFlag_Initialized, true);
   pNewFormItem->SetFlag(XFA_NodeFlag_Initialized, true);
   m_pDocView->RunLayout();
   CXFA_LayoutItem* pLayout =
@@ -485,7 +489,13 @@ CXFA_Node* CXFA_FFWidgetHandler::CreateSubform(CXFA_Node* pParent,
 CXFA_Node* CXFA_FFWidgetHandler::CreateFormItem(XFA_Element eElement,
                                                 CXFA_Node* pParent,
                                                 CXFA_Node* pBefore) const {
-  CXFA_Node* pTemplateParent = pParent ? pParent->GetTemplateNode() : nullptr;
+  if (!pParent)
+    return nullptr;
+
+  CXFA_Node* pTemplateParent = pParent->GetTemplateNodeIfExists();
+  if (!pTemplateParent)
+    return nullptr;
+
   CXFA_Node* pNewFormItem = pTemplateParent->CloneTemplateToForm(false);
   if (pParent)
     pParent->InsertChild(pNewFormItem, pBefore);
@@ -495,10 +505,13 @@ CXFA_Node* CXFA_FFWidgetHandler::CreateFormItem(XFA_Element eElement,
 CXFA_Node* CXFA_FFWidgetHandler::CreateCopyNode(XFA_Element eElement,
                                                 CXFA_Node* pParent,
                                                 CXFA_Node* pBefore) const {
-  CXFA_Node* pTemplateParent = pParent ? pParent->GetTemplateNode() : nullptr;
+  if (!pParent)
+    return nullptr;
+
+  CXFA_Node* pTemplateParent = pParent->GetTemplateNodeIfExists();
   CXFA_Node* pNewNode =
       CreateTemplateNode(eElement, pTemplateParent,
-                         pBefore ? pBefore->GetTemplateNode() : nullptr)
+                         pBefore ? pBefore->GetTemplateNodeIfExists() : nullptr)
           ->Clone(false);
   if (pParent)
     pParent->InsertChild(pNewNode, pBefore);
diff --git a/xfa/fxfa/parser/cxfa_itemlayoutprocessor.cpp b/xfa/fxfa/parser/cxfa_itemlayoutprocessor.cpp
index 6275650370..d5bbeef2ec 100644
--- a/xfa/fxfa/parser/cxfa_itemlayoutprocessor.cpp
+++ b/xfa/fxfa/parser/cxfa_itemlayoutprocessor.cpp
@@ -2824,7 +2824,7 @@ bool CXFA_ItemLayoutProcessor::JudgeLeaderOrTrailerForOccur(
   if (!pFormNode)
     return false;
 
-  CXFA_Node* pTemplate = pFormNode->GetTemplateNode();
+  CXFA_Node* pTemplate = pFormNode->GetTemplateNodeIfExists();
   if (!pTemplate)
     pTemplate = pFormNode;
 
diff --git a/xfa/fxfa/parser/cxfa_layoutpagemgr.cpp b/xfa/fxfa/parser/cxfa_layoutpagemgr.cpp
index c5b7d52caa..d30143c035 100644
--- a/xfa/fxfa/parser/cxfa_layoutpagemgr.cpp
+++ b/xfa/fxfa/parser/cxfa_layoutpagemgr.cpp
@@ -144,6 +144,9 @@ void RemoveLayoutItem(CXFA_ContainerLayoutItem* pLayoutItem) {
 CXFA_Node* ResolveBreakTarget(CXFA_Node* pPageSetRoot,
                               bool bNewExprStyle,
                               WideString& wsTargetAll) {
+  if (!pPageSetRoot)
+    return nullptr;
+
   CXFA_Document* pDocument = pPageSetRoot->GetDocument();
   if (wsTargetAll.IsEmpty())
     return nullptr;
@@ -282,7 +285,7 @@ CXFA_LayoutPageMgr::~CXFA_LayoutPageMgr() {
 
 bool CXFA_LayoutPageMgr::InitLayoutPage(CXFA_Node* pFormNode) {
   PrepareLayout();
-  CXFA_Node* pTemplateNode = pFormNode->GetTemplateNode();
+  CXFA_Node* pTemplateNode = pFormNode->GetTemplateNodeIfExists();
   if (!pTemplateNode)
     return false;
 
@@ -811,7 +814,7 @@ bool CXFA_LayoutPageMgr::ExecuteBreakBeforeOrAfter(
       WideString wsBreakLeader;
       WideString wsBreakTrailer;
       CXFA_Node* pFormNode = pCurNode->GetContainerParent();
-      CXFA_Node* pContainer = pFormNode->GetTemplateNode();
+      CXFA_Node* pContainer = pFormNode->GetTemplateNodeIfExists();
       bool bStartNew =
           pCurNode->JSObject()->GetInteger(XFA_Attribute::StartNew) != 0;
       CXFA_Script* pScript =
@@ -938,7 +941,7 @@ CXFA_Node* CXFA_LayoutPageMgr::BreakOverflow(CXFA_Node* pOverflowNode,
                                              CXFA_Node*& pTrailerTemplate,
                                              bool bCreatePage) {
   CXFA_Node* pContainer =
-      pOverflowNode->GetContainerParent()->GetTemplateNode();
+      pOverflowNode->GetContainerParent()->GetTemplateNodeIfExists();
   if (pOverflowNode->GetElementType() == XFA_Element::Break) {
     WideString wsOverflowLeader =
         pOverflowNode->JSObject()->GetCData(XFA_Attribute::OverflowLeader);
@@ -1069,7 +1072,8 @@ bool CXFA_LayoutPageMgr::ResolveBookendLeaderOrTrailer(
     CXFA_Node* pBookendNode,
     bool bLeader,
     CXFA_Node*& pBookendAppendTemplate) {
-  CXFA_Node* pContainer = pBookendNode->GetContainerParent()->GetTemplateNode();
+  CXFA_Node* pContainer =
+      pBookendNode->GetContainerParent()->GetTemplateNodeIfExists();
   if (pBookendNode->GetElementType() == XFA_Element::Break) {
     WideString leader = pBookendNode->JSObject()->GetCData(
         bLeader ? XFA_Attribute::BookendLeader : XFA_Attribute::BookendTrailer);
@@ -1800,7 +1804,8 @@ void CXFA_LayoutPageMgr::MergePageSetContents() {
           CXFA_Node* pParentNode = pContainerItem->m_pParent->m_pFormNode;
           for (CXFA_Node* pChildNode = pParentNode->GetFirstChild(); pChildNode;
                pChildNode = pChildNode->GetNextSibling()) {
-            if (pChildNode->GetTemplateNode() != pContainerItem->m_pFormNode) {
+            if (pChildNode->GetTemplateNodeIfExists() !=
+                pContainerItem->m_pFormNode) {
               continue;
             }
             pContainerItem->m_pFormNode = pChildNode;
diff --git a/xfa/fxfa/parser/cxfa_node.cpp b/xfa/fxfa/parser/cxfa_node.cpp
index 12a6ee4a0a..54b4661ce3 100644
--- a/xfa/fxfa/parser/cxfa_node.cpp
+++ b/xfa/fxfa/parser/cxfa_node.cpp
@@ -478,7 +478,7 @@ CXFA_Node* CXFA_Node::CloneTemplateToForm(bool bRecursive) {
   return pClone;
 }
 
-CXFA_Node* CXFA_Node::GetTemplateNode() const {
+CXFA_Node* CXFA_Node::GetTemplateNodeIfExists() const {
   return m_pAuxNode;
 }
 
@@ -1286,7 +1286,10 @@ void CXFA_Node::RemoveItem(CXFA_Node* pRemoveInstance,
 
 CXFA_Node* CXFA_Node::CreateInstance(bool bDataMerge) {
   CXFA_Document* pDocument = GetDocument();
-  CXFA_Node* pTemplateNode = GetTemplateNode();
+  CXFA_Node* pTemplateNode = GetTemplateNodeIfExists();
+  if (!pTemplateNode)
+    return nullptr;
+
   CXFA_Node* pFormParent = GetParent();
   CXFA_Node* pDataScope = nullptr;
   for (CXFA_Node* pRootBoundNode = pFormParent;
@@ -1300,6 +1303,7 @@ CXFA_Node* CXFA_Node::CreateInstance(bool bDataMerge) {
     pDataScope = ToNode(pDocument->GetXFAObject(XFA_HASHCODE_Record));
     ASSERT(pDataScope);
   }
+
   CXFA_Node* pInstance = pDocument->DataMerge_CopyContainer(
       pTemplateNode, pFormParent, pDataScope, true, bDataMerge, true);
   if (pInstance) {
@@ -1590,8 +1594,10 @@ bool CXFA_Node::IsOpenAccess() {
 }
 
 CXFA_Value* CXFA_Node::GetDefaultValue() {
-  CXFA_Node* pTemNode = GetTemplateNode();
-  return pTemNode->JSObject()->GetProperty<CXFA_Value>(0, XFA_Element::Value);
+  CXFA_Node* pTemNode = GetTemplateNodeIfExists();
+  return pTemNode ? pTemNode->JSObject()->GetProperty<CXFA_Value>(
+                        0, XFA_Element::Value)
+                  : nullptr;
 }
 
 CXFA_Value* CXFA_Node::GetFormValue() const {
diff --git a/xfa/fxfa/parser/cxfa_node.h b/xfa/fxfa/parser/cxfa_node.h
index f4ff51382f..1dcaeec0e5 100644
--- a/xfa/fxfa/parser/cxfa_node.h
+++ b/xfa/fxfa/parser/cxfa_node.h
@@ -190,7 +190,7 @@ class CXFA_Node : public CXFA_Object {
                                       XFA_Element eTypeFilter);
   CXFA_Node* CreateSamePacketNode(XFA_Element eType);
   CXFA_Node* CloneTemplateToForm(bool bRecursive);
-  CXFA_Node* GetTemplateNode() const;
+  CXFA_Node* GetTemplateNodeIfExists() const;
   void SetTemplateNode(CXFA_Node* pTemplateNode);
   CXFA_Node* GetDataDescriptionNode();
   void SetDataDescriptionNode(CXFA_Node* pDataDescriptionNode);
diff --git a/xfa/fxfa/parser/cxfa_nodehelper.cpp b/xfa/fxfa/parser/cxfa_nodehelper.cpp
index 6a090ffe96..c09d4f3c2d 100644
--- a/xfa/fxfa/parser/cxfa_nodehelper.cpp
+++ b/xfa/fxfa/parser/cxfa_nodehelper.cpp
@@ -368,9 +368,9 @@ bool CXFA_NodeHelper::ResolveNodes_CreateNode(WideString wsName,
 }
 
 void CXFA_NodeHelper::SetCreateNodeType(CXFA_Node* refNode) {
-  if (!refNode) {
+  if (!refNode)
     return;
-  }
+
   if (refNode->GetElementType() == XFA_Element::Subform) {
     m_eLastCreateType = XFA_Element::DataGroup;
   } else if (refNode->GetElementType() == XFA_Element::Field) {
diff --git a/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp b/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp
index e2e212f70b..3332d90b66 100644
--- a/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp
+++ b/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp
@@ -1090,7 +1090,7 @@ void UpdateBindingRelations(CXFA_Document* pDocument,
   CXFA_Node* pDataNode = pFormNode->GetBindData();
   if (eType == XFA_Element::Subform || eType == XFA_Element::ExclGroup ||
       eType == XFA_Element::Field) {
-    CXFA_Node* pTemplateNode = pFormNode->GetTemplateNode();
+    CXFA_Node* pTemplateNode = pFormNode->GetTemplateNodeIfExists();
     CXFA_Bind* pTemplateNodeBind =
         pTemplateNode
             ? pTemplateNode->GetFirstChildByClass<CXFA_Bind>(XFA_Element::Bind)
@@ -1168,7 +1168,9 @@ void UpdateBindingRelations(CXFA_Document* pDocument,
         bParentDataRef = true;
         if (!pDataNode && bDataRef) {
           WideString wsRef =
-              pTemplateNodeBind->JSObject()->GetCData(XFA_Attribute::Ref);
+              pTemplateNodeBind
+                  ? pTemplateNodeBind->JSObject()->GetCData(XFA_Attribute::Ref)
+                  : L"";
           uint32_t dFlags =
               XFA_RESOLVENODE_Children | XFA_RESOLVENODE_CreateNode;
           XFA_RESOLVENODE_RS rs;
diff --git a/xfa/fxfa/parser/xfa_utils.cpp b/xfa/fxfa/parser/xfa_utils.cpp
index bda4c2c92f..7e1f44d5dd 100644
--- a/xfa/fxfa/parser/xfa_utils.cpp
+++ b/xfa/fxfa/parser/xfa_utils.cpp
@@ -285,7 +285,7 @@ void RegenerateFormFile_Changed(CXFA_Node* pNode,
     }
     default:
       if (pNode->GetElementType() == XFA_Element::Items) {
-        CXFA_Node* pTemplateNode = pNode->GetTemplateNode();
+        CXFA_Node* pTemplateNode = pNode->GetTemplateNodeIfExists();
         if (!pTemplateNode ||
             pTemplateNode->CountChildren(XFA_Element::Unknown, false) !=
                 pNode->CountChildren(XFA_Element::Unknown, false)) {