Cleanup CXFA_OccurData

Make methods const, use return instead of out params.

Change-Id: Idfdae8df5cd74ba0bce08c05a6fc34b168d25f79
Reviewed-on: https://pdfium-review.googlesource.com/19050
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

3 files changed, 29 insertions, 30 deletions

diff --git a/xfa/fxfa/parser/cxfa_occurdata.cpp b/xfa/fxfa/parser/cxfa_occurdata.cpp
index 4538919d10..ffad9fdf00 100644
--- a/xfa/fxfa/parser/cxfa_occurdata.cpp
+++ b/xfa/fxfa/parser/cxfa_occurdata.cpp
@@ -10,7 +10,7 @@
 
 CXFA_OccurData::CXFA_OccurData(CXFA_Node* pNode) : CXFA_DataData(pNode) {}
 
-int32_t CXFA_OccurData::GetMax() {
+int32_t CXFA_OccurData::GetMax() const {
   if (!m_pNode)
     return 1;
 
@@ -19,7 +19,7 @@ int32_t CXFA_OccurData::GetMax() {
   return max ? *max : GetMin();
 }
 
-int32_t CXFA_OccurData::GetMin() {
+int32_t CXFA_OccurData::GetMin() const {
   if (!m_pNode)
     return 1;
 
@@ -28,25 +28,21 @@ int32_t CXFA_OccurData::GetMin() {
   return min && *min >= 0 ? *min : 1;
 }
 
-bool CXFA_OccurData::GetOccurInfo(int32_t& iMin,
-                                  int32_t& iMax,
-                                  int32_t& iInit) {
-  if (!m_pNode)
-    return false;
+std::tuple<int32_t, int32_t, int32_t> CXFA_OccurData::GetOccurInfo() const {
+  ASSERT(m_pNode);
 
-  iMin = GetMin();
-  iMax = GetMax();
+  int32_t iMin = GetMin();
+  int32_t iMax = GetMax();
 
   pdfium::Optional<int32_t> init =
       m_pNode->JSNode()->TryInteger(XFA_Attribute::Initial, false);
-  iInit = init && *init >= iMin ? *init : iMin;
-
-  return true;
+  return {iMin, iMax, init && *init >= iMin ? *init : iMin};
 }
 
 void CXFA_OccurData::SetMax(int32_t iMax) {
   iMax = (iMax != -1 && iMax < 1) ? 1 : iMax;
   m_pNode->JSNode()->SetInteger(XFA_Attribute::Max, iMax, false);
+
   int32_t iMin = GetMin();
   if (iMax != -1 && iMax < iMin) {
     iMin = iMax;
@@ -57,6 +53,7 @@ void CXFA_OccurData::SetMax(int32_t iMax) {
 void CXFA_OccurData::SetMin(int32_t iMin) {
   iMin = (iMin < 0) ? 1 : iMin;
   m_pNode->JSNode()->SetInteger(XFA_Attribute::Min, iMin, false);
+
   int32_t iMax = GetMax();
   if (iMax > 0 && iMax < iMin) {
     iMax = iMin;
diff --git a/xfa/fxfa/parser/cxfa_occurdata.h b/xfa/fxfa/parser/cxfa_occurdata.h
index 4ce7bda319..7c90a1993b 100644
--- a/xfa/fxfa/parser/cxfa_occurdata.h
+++ b/xfa/fxfa/parser/cxfa_occurdata.h
@@ -7,6 +7,8 @@
 #ifndef XFA_FXFA_PARSER_CXFA_OCCURDATA_H_
 #define XFA_FXFA_PARSER_CXFA_OCCURDATA_H_
 
+#include <tuple>
+
 #include "core/fxcrt/fx_system.h"
 #include "xfa/fxfa/parser/cxfa_datadata.h"
 
@@ -16,11 +18,13 @@ class CXFA_OccurData : public CXFA_DataData {
  public:
   explicit CXFA_OccurData(CXFA_Node* pNode);
 
-  int32_t GetMax();
-  int32_t GetMin();
-  bool GetOccurInfo(int32_t& iMin, int32_t& iMax, int32_t& iInit);
+  int32_t GetMax() const;
   void SetMax(int32_t iMax);
+
+  int32_t GetMin() const;
   void SetMin(int32_t iMin);
+
+  std::tuple<int32_t, int32_t, int32_t> GetOccurInfo() const;
 };
 
 #endif  // XFA_FXFA_PARSER_CXFA_OCCURDATA_H_
diff --git a/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp b/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp
index b7b3c0c12e..381e176927 100644
--- a/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp
+++ b/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp
@@ -46,14 +46,6 @@ struct RecurseRecord {
   CXFA_Node* pDataChild;
 };
 
-bool GetOccurInfo(CXFA_Node* pOccurNode,
-                  int32_t& iMin,
-                  int32_t& iMax,
-                  int32_t& iInit) {
-  return pOccurNode ? CXFA_OccurData(pOccurNode).GetOccurInfo(iMin, iMax, iInit)
-                    : false;
-}
-
 CXFA_Node* FormValueNode_CreateChild(CXFA_Node* pValueNode, XFA_Element iType) {
   CXFA_Node* pChildNode = pValueNode->GetNodeItem(XFA_NODEITEM_FirstChild);
   if (!pChildNode) {
@@ -597,13 +589,19 @@ CXFA_Node* FindMatchingDataNode(
         pCurTemplateNode = pIterator->MoveToNext();
         continue;
     }
+
     CXFA_Node* pTemplateNodeOccur =
         pCurTemplateNode->GetFirstChildByClass(XFA_Element::Occur);
-    int32_t iMin, iMax, iInit;
-    if (pTemplateNodeOccur &&
-        GetOccurInfo(pTemplateNodeOccur, iMin, iMax, iInit) && iMax == 0) {
-      pCurTemplateNode = pIterator->MoveToNext();
-      continue;
+    if (pTemplateNodeOccur) {
+      int32_t iMin;
+      int32_t iMax;
+      int32_t iInit;
+      std::tie(iMin, iMax, iInit) =
+          CXFA_OccurData(pTemplateNodeOccur).GetOccurInfo();
+      if (iMax == 0) {
+        pCurTemplateNode = pIterator->MoveToNext();
+        continue;
+      }
     }
 
     CXFA_Node* pTemplateNodeBind =
@@ -750,8 +748,8 @@ CXFA_Node* CopyContainer_SubformSet(CXFA_Document* pDocument,
   int32_t iMax = 1;
   int32_t iInit = 1;
   int32_t iMin = 1;
-  if (!bOneInstance)
-    GetOccurInfo(pOccurNode, iMin, iMax, iInit);
+  if (!bOneInstance && pOccurNode)
+    std::tie(iMin, iMax, iInit) = CXFA_OccurData(pOccurNode).GetOccurInfo();
 
   XFA_ATTRIBUTEENUM eRelation =
       eType == XFA_Element::SubformSet