Convert TryEnum to return an optional

This CL converts CJX_Node::TryEnum to return a pdfium::Optional instead
of a bool with an out parameter.

Change-Id: Icc1b063ce51656cc5e467aba358eb9e7d6754fea
Reviewed-on: https://pdfium-review.googlesource.com/18512
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>

11 files changed, 114 insertions, 121 deletions

diff --git a/xfa/fxfa/cxfa_widgetacc.cpp b/xfa/fxfa/cxfa_widgetacc.cpp
index a7d28cb5aa..a579646fd9 100644
--- a/xfa/fxfa/cxfa_widgetacc.cpp
+++ b/xfa/fxfa/cxfa_widgetacc.cpp
@@ -1275,11 +1275,10 @@ bool CXFA_WidgetAcc::FindSplitPos(int32_t iBlockIndex, float& fCalcHeight) {
 
   XFA_VERSION version = GetDoc()->GetXFADoc()->GetCurVersionMode();
   bool bCanSplitNoContent = false;
-  XFA_ATTRIBUTEENUM eLayoutMode;
-  GetNode()
-      ->GetNodeItem(XFA_NODEITEM_Parent)
-      ->JSNode()
-      ->TryEnum(XFA_Attribute::Layout, eLayoutMode, true);
+  XFA_ATTRIBUTEENUM eLayoutMode = GetNode()
+                                      ->GetNodeItem(XFA_NODEITEM_Parent)
+                                      ->JSNode()
+                                      ->GetEnum(XFA_Attribute::Layout);
   if ((eLayoutMode == XFA_ATTRIBUTEENUM_Position ||
        eLayoutMode == XFA_ATTRIBUTEENUM_Tb ||
        eLayoutMode == XFA_ATTRIBUTEENUM_Row ||
diff --git a/xfa/fxfa/parser/cxfa_calculatedata.cpp b/xfa/fxfa/parser/cxfa_calculatedata.cpp
index ef152f48d7..b468be77db 100644
--- a/xfa/fxfa/parser/cxfa_calculatedata.cpp
+++ b/xfa/fxfa/parser/cxfa_calculatedata.cpp
@@ -13,9 +13,9 @@ CXFA_CalculateData::CXFA_CalculateData(CXFA_Node* pNode)
     : CXFA_DataData(pNode) {}
 
 int32_t CXFA_CalculateData::GetOverride() {
-  XFA_ATTRIBUTEENUM eAtt = XFA_ATTRIBUTEENUM_Error;
-  m_pNode->JSNode()->TryEnum(XFA_Attribute::Override, eAtt, false);
-  return eAtt;
+  return m_pNode->JSNode()
+      ->TryEnum(XFA_Attribute::Override, false)
+      .value_or(XFA_ATTRIBUTEENUM_Error);
 }
 
 CXFA_ScriptData CXFA_CalculateData::GetScriptData() {
diff --git a/xfa/fxfa/parser/cxfa_captiondata.cpp b/xfa/fxfa/parser/cxfa_captiondata.cpp
index c898a763ac..db7ca9d875 100644
--- a/xfa/fxfa/parser/cxfa_captiondata.cpp
+++ b/xfa/fxfa/parser/cxfa_captiondata.cpp
@@ -12,15 +12,15 @@
 CXFA_CaptionData::CXFA_CaptionData(CXFA_Node* pNode) : CXFA_DataData(pNode) {}
 
 int32_t CXFA_CaptionData::GetPresence() {
-  XFA_ATTRIBUTEENUM eAttr = XFA_ATTRIBUTEENUM_Visible;
-  m_pNode->JSNode()->TryEnum(XFA_Attribute::Presence, eAttr, true);
-  return eAttr;
+  return m_pNode->JSNode()
+      ->TryEnum(XFA_Attribute::Presence, true)
+      .value_or(XFA_ATTRIBUTEENUM_Visible);
 }
 
 int32_t CXFA_CaptionData::GetPlacementType() {
-  XFA_ATTRIBUTEENUM eAttr = XFA_ATTRIBUTEENUM_Left;
-  m_pNode->JSNode()->TryEnum(XFA_Attribute::Placement, eAttr, true);
-  return eAttr;
+  return m_pNode->JSNode()
+      ->TryEnum(XFA_Attribute::Placement, true)
+      .value_or(XFA_ATTRIBUTEENUM_Left);
 }
 
 float CXFA_CaptionData::GetReserve() {
diff --git a/xfa/fxfa/parser/cxfa_filldata.cpp b/xfa/fxfa/parser/cxfa_filldata.cpp
index 4e1e5f1af2..da249548f9 100644
--- a/xfa/fxfa/parser/cxfa_filldata.cpp
+++ b/xfa/fxfa/parser/cxfa_filldata.cpp
@@ -86,15 +86,15 @@ int32_t CXFA_FillData::GetLinear(FX_ARGB& endColor) {
 
   CXFA_Node* pNode =
       m_pNode->JSNode()->GetProperty(0, XFA_Element::Linear, true);
-  XFA_ATTRIBUTEENUM eAttr = XFA_ATTRIBUTEENUM_ToRight;
-  pNode->JSNode()->TryEnum(XFA_Attribute::Type, eAttr, true);
   if (CXFA_Node* pColor = pNode->GetChild(0, XFA_Element::Color, false)) {
     pdfium::Optional<WideString> wsColor =
         pColor->JSNode()->TryCData(XFA_Attribute::Value, false);
     if (wsColor)
       endColor = CXFA_DataData::ToColor(wsColor->AsStringView());
   }
-  return eAttr;
+  return pNode->JSNode()
+      ->TryEnum(XFA_Attribute::Type, true)
+      .value_or(XFA_ATTRIBUTEENUM_ToRight);
 }
 
 int32_t CXFA_FillData::GetRadial(FX_ARGB& endColor) {
@@ -102,13 +102,13 @@ int32_t CXFA_FillData::GetRadial(FX_ARGB& endColor) {
 
   CXFA_Node* pNode =
       m_pNode->JSNode()->GetProperty(0, XFA_Element::Radial, true);
-  XFA_ATTRIBUTEENUM eAttr = XFA_ATTRIBUTEENUM_ToEdge;
-  pNode->JSNode()->TryEnum(XFA_Attribute::Type, eAttr, true);
   if (CXFA_Node* pColor = pNode->GetChild(0, XFA_Element::Color, false)) {
     pdfium::Optional<WideString> wsColor =
         pColor->JSNode()->TryCData(XFA_Attribute::Value, false);
     if (wsColor)
       endColor = CXFA_DataData::ToColor(wsColor->AsStringView());
   }
-  return eAttr;
+  return pNode->JSNode()
+      ->TryEnum(XFA_Attribute::Type, true)
+      .value_or(XFA_ATTRIBUTEENUM_ToEdge);
 }
diff --git a/xfa/fxfa/parser/cxfa_fontdata.cpp b/xfa/fxfa/parser/cxfa_fontdata.cpp
index f5600f24df..5ca845f056 100644
--- a/xfa/fxfa/parser/cxfa_fontdata.cpp
+++ b/xfa/fxfa/parser/cxfa_fontdata.cpp
@@ -51,9 +51,9 @@ int32_t CXFA_FontData::GetUnderline() {
 }
 
 int32_t CXFA_FontData::GetUnderlinePeriod() {
-  XFA_ATTRIBUTEENUM eAttr = XFA_ATTRIBUTEENUM_All;
-  m_pNode->JSNode()->TryEnum(XFA_Attribute::UnderlinePeriod, eAttr, true);
-  return eAttr;
+  return m_pNode->JSNode()
+      ->TryEnum(XFA_Attribute::UnderlinePeriod, true)
+      .value_or(XFA_ATTRIBUTEENUM_All);
 }
 
 float CXFA_FontData::GetFontSize() {
@@ -67,15 +67,13 @@ void CXFA_FontData::GetTypeface(WideString& wsTypeFace) {
 }
 
 bool CXFA_FontData::IsBold() {
-  XFA_ATTRIBUTEENUM eAttr = XFA_ATTRIBUTEENUM_Normal;
-  m_pNode->JSNode()->TryEnum(XFA_Attribute::Weight, eAttr, true);
-  return eAttr == XFA_ATTRIBUTEENUM_Bold;
+  return m_pNode->JSNode()->GetEnum(XFA_Attribute::Weight) ==
+         XFA_ATTRIBUTEENUM_Bold;
 }
 
 bool CXFA_FontData::IsItalic() {
-  XFA_ATTRIBUTEENUM eAttr = XFA_ATTRIBUTEENUM_Normal;
-  m_pNode->JSNode()->TryEnum(XFA_Attribute::Posture, eAttr, true);
-  return eAttr == XFA_ATTRIBUTEENUM_Italic;
+  return m_pNode->JSNode()->GetEnum(XFA_Attribute::Posture) ==
+         XFA_ATTRIBUTEENUM_Italic;
 }
 
 void CXFA_FontData::SetColor(FX_ARGB color) {
diff --git a/xfa/fxfa/parser/cxfa_itemlayoutprocessor.cpp b/xfa/fxfa/parser/cxfa_itemlayoutprocessor.cpp
index 332bed2a9f..bf950ab543 100644
--- a/xfa/fxfa/parser/cxfa_itemlayoutprocessor.cpp
+++ b/xfa/fxfa/parser/cxfa_itemlayoutprocessor.cpp
@@ -483,9 +483,10 @@ float InsertPendingItems(CXFA_ItemLayoutProcessor* pProcessor,
 
 XFA_ATTRIBUTEENUM GetLayout(CXFA_Node* pFormNode, bool* bRootForceTb) {
   *bRootForceTb = false;
-  XFA_ATTRIBUTEENUM eLayoutMode;
-  if (pFormNode->JSNode()->TryEnum(XFA_Attribute::Layout, eLayoutMode, false))
-    return eLayoutMode;
+  pdfium::Optional<XFA_ATTRIBUTEENUM> layoutMode =
+      pFormNode->JSNode()->TryEnum(XFA_Attribute::Layout, false);
+  if (layoutMode)
+    return *layoutMode;
 
   CXFA_Node* pParentNode = pFormNode->GetNodeItem(XFA_NODEITEM_Parent);
   if (pParentNode && pParentNode->GetElementType() == XFA_Element::Form) {
@@ -510,14 +511,15 @@ bool ExistContainerKeep(CXFA_Node* pCurNode, bool bPreFind) {
 
   CXFA_Node* pKeep = pCurNode->GetFirstChildByClass(XFA_Element::Keep);
   if (pKeep) {
-    XFA_ATTRIBUTEENUM ePrevious;
     XFA_Attribute eKeepType = XFA_Attribute::Previous;
     if (!bPreFind)
       eKeepType = XFA_Attribute::Next;
 
-    if (pKeep->JSNode()->TryEnum(eKeepType, ePrevious, false)) {
-      if (ePrevious == XFA_ATTRIBUTEENUM_ContentArea ||
-          ePrevious == XFA_ATTRIBUTEENUM_PageArea) {
+    pdfium::Optional<XFA_ATTRIBUTEENUM> previous =
+        pKeep->JSNode()->TryEnum(eKeepType, false);
+    if (previous) {
+      if (*previous == XFA_ATTRIBUTEENUM_ContentArea ||
+          *previous == XFA_ATTRIBUTEENUM_PageArea) {
         return true;
       }
     }
@@ -531,11 +533,12 @@ bool ExistContainerKeep(CXFA_Node* pCurNode, bool bPreFind) {
   if (!bPreFind)
     eKeepType = XFA_Attribute::Previous;
 
-  XFA_ATTRIBUTEENUM eNext;
-  if (!pKeep->JSNode()->TryEnum(eKeepType, eNext, false))
+  pdfium::Optional<XFA_ATTRIBUTEENUM> next =
+      pKeep->JSNode()->TryEnum(eKeepType, false);
+  if (!next)
     return false;
-  if (eNext == XFA_ATTRIBUTEENUM_ContentArea ||
-      eNext == XFA_ATTRIBUTEENUM_PageArea) {
+  if (*next == XFA_ATTRIBUTEENUM_ContentArea ||
+      *next == XFA_ATTRIBUTEENUM_PageArea) {
     return true;
   }
   return false;
diff --git a/xfa/fxfa/parser/cxfa_layoutpagemgr.cpp b/xfa/fxfa/parser/cxfa_layoutpagemgr.cpp
index e301825735..72f5594982 100644
--- a/xfa/fxfa/parser/cxfa_layoutpagemgr.cpp
+++ b/xfa/fxfa/parser/cxfa_layoutpagemgr.cpp
@@ -645,9 +645,8 @@ void CXFA_LayoutPageMgr::FinishPaginatedPageSets() {
           XFA_ATTRIBUTEENUM eCurChoice =
               pNode->JSNode()->GetEnum(XFA_Attribute::PagePosition);
           if (eCurChoice == XFA_ATTRIBUTEENUM_Last) {
-            XFA_ATTRIBUTEENUM eOddOrEven = XFA_ATTRIBUTEENUM_Any;
-            pNode->JSNode()->TryEnum(XFA_Attribute::OddOrEven, eOddOrEven,
-                                     true);
+            XFA_ATTRIBUTEENUM eOddOrEven =
+                pNode->JSNode()->GetEnum(XFA_Attribute::OddOrEven);
             XFA_ATTRIBUTEENUM eLastChoice =
                 pLastPageAreaLayoutItem->m_pFormNode->JSNode()->GetEnum(
                     XFA_Attribute::PagePosition);
@@ -1216,7 +1215,7 @@ bool CXFA_LayoutPageMgr::FindPageAreaFromPageSet_SimplexDuplex(
   for (; pCurrentNode;
        pCurrentNode = pCurrentNode->GetNodeItem(XFA_NODEITEM_NextSibling)) {
     if (pCurrentNode->GetElementType() == XFA_Element::PageArea) {
-      if (!MatchPageAreaOddOrEven(pCurrentNode, false))
+      if (!MatchPageAreaOddOrEven(pCurrentNode))
         continue;
 
       XFA_ATTRIBUTEENUM eCurPagePosition =
@@ -1266,8 +1265,7 @@ bool CXFA_LayoutPageMgr::FindPageAreaFromPageSet_SimplexDuplex(
                    !pFallbackPageArea) {
           pFallbackPageArea = pCurrentNode;
         }
-      } else if (pTargetPageArea &&
-                 !MatchPageAreaOddOrEven(pTargetPageArea, false)) {
+      } else if (pTargetPageArea && !MatchPageAreaOddOrEven(pTargetPageArea)) {
         CXFA_ContainerRecord* pNewRecord = CreateContainerRecord();
         AddPageAreaLayoutItem(pNewRecord, pCurrentNode);
         AddContentAreaLayoutItem(pNewRecord, pCurrentNode->GetFirstChildByClass(
@@ -1304,23 +1302,17 @@ bool CXFA_LayoutPageMgr::FindPageAreaFromPageSet_SimplexDuplex(
   return true;
 }
 
-bool CXFA_LayoutPageMgr::MatchPageAreaOddOrEven(CXFA_Node* pPageArea,
-                                                bool bLastMatch) {
+bool CXFA_LayoutPageMgr::MatchPageAreaOddOrEven(CXFA_Node* pPageArea) {
   if (m_ePageSetMode != XFA_ATTRIBUTEENUM_DuplexPaginated)
     return true;
 
-  XFA_ATTRIBUTEENUM eOddOrEven = XFA_ATTRIBUTEENUM_Any;
-  pPageArea->JSNode()->TryEnum(XFA_Attribute::OddOrEven, eOddOrEven, true);
-  if (eOddOrEven != XFA_ATTRIBUTEENUM_Any) {
-    int32_t iPageCount = GetPageCount();
-    if (bLastMatch) {
-      return eOddOrEven == XFA_ATTRIBUTEENUM_Odd ? iPageCount % 2 == 1
-                                                 : iPageCount % 2 == 0;
-    }
-    return eOddOrEven == XFA_ATTRIBUTEENUM_Odd ? iPageCount % 2 == 0
-                                               : iPageCount % 2 == 1;
-  }
-  return true;
+  pdfium::Optional<XFA_ATTRIBUTEENUM> ret =
+      pPageArea->JSNode()->TryEnum(XFA_Attribute::OddOrEven, true);
+  if (!ret || *ret == XFA_ATTRIBUTEENUM_Any)
+    return true;
+
+  int32_t iPageLast = GetPageCount() % 2;
+  return *ret == XFA_ATTRIBUTEENUM_Odd ? iPageLast == 0 : iPageLast == 1;
 }
 
 CXFA_Node* CXFA_LayoutPageMgr::GetNextAvailPageArea(
diff --git a/xfa/fxfa/parser/cxfa_layoutpagemgr.h b/xfa/fxfa/parser/cxfa_layoutpagemgr.h
index 085ea89671..7ab1d4f82c 100644
--- a/xfa/fxfa/parser/cxfa_layoutpagemgr.h
+++ b/xfa/fxfa/parser/cxfa_layoutpagemgr.h
@@ -112,7 +112,7 @@ class CXFA_LayoutPageMgr {
       bool bNewPage = false,
       bool bQuery = false,
       XFA_ATTRIBUTEENUM ePreferredPosition = XFA_ATTRIBUTEENUM_First);
-  bool MatchPageAreaOddOrEven(CXFA_Node* pPageArea, bool bLastMatch);
+  bool MatchPageAreaOddOrEven(CXFA_Node* pPageArea);
   CXFA_Node* GetNextAvailPageArea(CXFA_Node* pTargetPageArea,
                                   CXFA_Node* pTargetContentArea = nullptr,
                                   bool bNewPage = false,
diff --git a/xfa/fxfa/parser/cxfa_node.cpp b/xfa/fxfa/parser/cxfa_node.cpp
index 5a375c7f2a..90579ff5e2 100644
--- a/xfa/fxfa/parser/cxfa_node.cpp
+++ b/xfa/fxfa/parser/cxfa_node.cpp
@@ -568,9 +568,10 @@ XFA_ATTRIBUTEENUM CXFA_Node::GetIntact() {
   CXFA_Node* pKeep = GetFirstChildByClass(XFA_Element::Keep);
   XFA_ATTRIBUTEENUM eLayoutType = JSNode()->GetEnum(XFA_Attribute::Layout);
   if (pKeep) {
-    XFA_ATTRIBUTEENUM eIntact;
-    if (pKeep->JSNode()->TryEnum(XFA_Attribute::Intact, eIntact, false)) {
-      if (eIntact == XFA_ATTRIBUTEENUM_None &&
+    pdfium::Optional<XFA_ATTRIBUTEENUM> intact =
+        pKeep->JSNode()->TryEnum(XFA_Attribute::Intact, false);
+    if (intact) {
+      if (*intact == XFA_ATTRIBUTEENUM_None &&
           eLayoutType == XFA_ATTRIBUTEENUM_Row &&
           m_pDocument->GetCurVersionMode() < XFA_VERSION_208) {
         CXFA_Node* pPreviewRow = GetNodeItem(XFA_NODEITEM_PrevSibling,
@@ -578,24 +579,25 @@ XFA_ATTRIBUTEENUM CXFA_Node::GetIntact() {
         if (pPreviewRow &&
             pPreviewRow->JSNode()->GetEnum(XFA_Attribute::Layout) ==
                 XFA_ATTRIBUTEENUM_Row) {
-          XFA_ATTRIBUTEENUM eValue;
-          if (pKeep->JSNode()->TryEnum(XFA_Attribute::Previous, eValue,
-                                       false) &&
-              (eValue == XFA_ATTRIBUTEENUM_ContentArea ||
-               eValue == XFA_ATTRIBUTEENUM_PageArea)) {
+          pdfium::Optional<XFA_ATTRIBUTEENUM> value =
+              pKeep->JSNode()->TryEnum(XFA_Attribute::Previous, false);
+          if (value && (*value == XFA_ATTRIBUTEENUM_ContentArea ||
+                        *value == XFA_ATTRIBUTEENUM_PageArea)) {
             return XFA_ATTRIBUTEENUM_ContentArea;
           }
+
           CXFA_Node* pNode =
               pPreviewRow->GetFirstChildByClass(XFA_Element::Keep);
-          if (pNode &&
-              pNode->JSNode()->TryEnum(XFA_Attribute::Next, eValue, false) &&
-              (eValue == XFA_ATTRIBUTEENUM_ContentArea ||
-               eValue == XFA_ATTRIBUTEENUM_PageArea)) {
+          pdfium::Optional<XFA_ATTRIBUTEENUM> ret;
+          if (pNode)
+            ret = pNode->JSNode()->TryEnum(XFA_Attribute::Next, false);
+          if (ret && (*ret == XFA_ATTRIBUTEENUM_ContentArea ||
+                      *ret == XFA_ATTRIBUTEENUM_PageArea)) {
             return XFA_ATTRIBUTEENUM_ContentArea;
           }
         }
       }
-      return eIntact;
+      return *intact;
     }
   }
   switch (GetElementType()) {
diff --git a/xfa/fxfa/parser/cxfa_paradata.cpp b/xfa/fxfa/parser/cxfa_paradata.cpp
index 55db1313f2..a04c195ba6 100644
--- a/xfa/fxfa/parser/cxfa_paradata.cpp
+++ b/xfa/fxfa/parser/cxfa_paradata.cpp
@@ -12,15 +12,15 @@
 CXFA_ParaData::CXFA_ParaData(CXFA_Node* pNode) : CXFA_DataData(pNode) {}
 
 int32_t CXFA_ParaData::GetHorizontalAlign() {
-  XFA_ATTRIBUTEENUM eAttr = XFA_ATTRIBUTEENUM_Left;
-  m_pNode->JSNode()->TryEnum(XFA_Attribute::HAlign, eAttr, true);
-  return eAttr;
+  return m_pNode->JSNode()
+      ->TryEnum(XFA_Attribute::HAlign, true)
+      .value_or(XFA_ATTRIBUTEENUM_Left);
 }
 
 int32_t CXFA_ParaData::GetVerticalAlign() {
-  XFA_ATTRIBUTEENUM eAttr = XFA_ATTRIBUTEENUM_Top;
-  m_pNode->JSNode()->TryEnum(XFA_Attribute::VAlign, eAttr, true);
-  return eAttr;
+  return m_pNode->JSNode()
+      ->TryEnum(XFA_Attribute::VAlign, true)
+      .value_or(XFA_ATTRIBUTEENUM_Top);
 }
 
 float CXFA_ParaData::GetLineHeight() {
diff --git a/xfa/fxfa/parser/cxfa_widgetdata.cpp b/xfa/fxfa/parser/cxfa_widgetdata.cpp
index 90d02994de..9613383879 100644
--- a/xfa/fxfa/parser/cxfa_widgetdata.cpp
+++ b/xfa/fxfa/parser/cxfa_widgetdata.cpp
@@ -1144,25 +1144,23 @@ bool CXFA_WidgetData::GetBarcodeAttribute_CharEncoding(int32_t* val) {
 }
 
 bool CXFA_WidgetData::GetBarcodeAttribute_Checksum(bool* val) {
-  CXFA_Node* pUIChild = GetUIChild();
-  XFA_ATTRIBUTEENUM eChecksum;
-  if (pUIChild->JSNode()->TryEnum(XFA_Attribute::Checksum, eChecksum, true)) {
-    switch (eChecksum) {
-      case XFA_ATTRIBUTEENUM_None:
-        *val = false;
-        return true;
-      case XFA_ATTRIBUTEENUM_Auto:
-        *val = true;
-        return true;
-      case XFA_ATTRIBUTEENUM_1mod10:
-        break;
-      case XFA_ATTRIBUTEENUM_1mod10_1mod11:
-        break;
-      case XFA_ATTRIBUTEENUM_2mod10:
-        break;
-      default:
-        break;
-    }
+  pdfium::Optional<XFA_ATTRIBUTEENUM> checksum =
+      GetUIChild()->JSNode()->TryEnum(XFA_Attribute::Checksum, true);
+  if (!checksum)
+    return false;
+
+  switch (*checksum) {
+    case XFA_ATTRIBUTEENUM_None:
+      *val = false;
+      return true;
+    case XFA_ATTRIBUTEENUM_Auto:
+      *val = true;
+      return true;
+    case XFA_ATTRIBUTEENUM_1mod10:
+    case XFA_ATTRIBUTEENUM_1mod10_1mod11:
+    case XFA_ATTRIBUTEENUM_2mod10:
+    default:
+      break;
   }
   return false;
 }
@@ -1238,28 +1236,29 @@ bool CXFA_WidgetData::GetBarcodeAttribute_PrintChecksum(bool* val) {
 }
 
 bool CXFA_WidgetData::GetBarcodeAttribute_TextLocation(int32_t* val) {
-  XFA_ATTRIBUTEENUM eTextLocation;
-  if (GetUIChild()->JSNode()->TryEnum(XFA_Attribute::TextLocation,
-                                      eTextLocation, true)) {
-    switch (eTextLocation) {
-      case XFA_ATTRIBUTEENUM_None:
-        *val = BC_TEXT_LOC_NONE;
-        return true;
-      case XFA_ATTRIBUTEENUM_Above:
-        *val = BC_TEXT_LOC_ABOVE;
-        return true;
-      case XFA_ATTRIBUTEENUM_Below:
-        *val = BC_TEXT_LOC_BELOW;
-        return true;
-      case XFA_ATTRIBUTEENUM_AboveEmbedded:
-        *val = BC_TEXT_LOC_ABOVEEMBED;
-        return true;
-      case XFA_ATTRIBUTEENUM_BelowEmbedded:
-        *val = BC_TEXT_LOC_BELOWEMBED;
-        return true;
-      default:
-        break;
-    }
+  pdfium::Optional<XFA_ATTRIBUTEENUM> textLocation =
+      GetUIChild()->JSNode()->TryEnum(XFA_Attribute::TextLocation, true);
+  if (!textLocation)
+    return false;
+
+  switch (*textLocation) {
+    case XFA_ATTRIBUTEENUM_None:
+      *val = BC_TEXT_LOC_NONE;
+      return true;
+    case XFA_ATTRIBUTEENUM_Above:
+      *val = BC_TEXT_LOC_ABOVE;
+      return true;
+    case XFA_ATTRIBUTEENUM_Below:
+      *val = BC_TEXT_LOC_BELOW;
+      return true;
+    case XFA_ATTRIBUTEENUM_AboveEmbedded:
+      *val = BC_TEXT_LOC_ABOVEEMBED;
+      return true;
+    case XFA_ATTRIBUTEENUM_BelowEmbedded:
+      *val = BC_TEXT_LOC_BELOWEMBED;
+      return true;
+    default:
+      break;
   }
   return false;
 }