Convert Formcalc ToJavascript to a pointer WideTextBuf

This CL converts the WidetextBuf reference to a pointer in the formcalc
ToJavaScript methods.

Change-Id: Ia05c7255a99a2eaa3d9a57f77580969896ad90a0
Reviewed-on: https://pdfium-review.googlesource.com/32612
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

7 files changed, 226 insertions, 224 deletions

diff --git a/fxjs/cfxjse_formcalc_context.cpp b/fxjs/cfxjse_formcalc_context.cpp
index a6d151b468..6a938a5da7 100644
--- a/fxjs/cfxjse_formcalc_context.cpp
+++ b/fxjs/cfxjse_formcalc_context.cpp
@@ -6185,12 +6185,12 @@ bool CFXJSE_FormCalcContext::Translate(const WideStringView& wsFormcalc,
     return false;
 
   CXFA_FMToJavaScriptDepth::Reset();
-  if (!ast->ToJavaScript(*wsJavascript))
+  if (!ast->ToJavaScript(wsJavascript))
     return false;
 
   wsJavascript->AppendChar(0);
 
-  return !CXFA_IsTooBig(*wsJavascript);
+  return !CXFA_IsTooBig(wsJavascript);
 }
 
 CFXJSE_FormCalcContext::CFXJSE_FormCalcContext(v8::Isolate* pScriptIsolate,
diff --git a/xfa/fxfa/fm2js/cxfa_fmexpression.cpp b/xfa/fxfa/fm2js/cxfa_fmexpression.cpp
index ef2153d6be..9ff043a1ab 100644
--- a/xfa/fxfa/fm2js/cxfa_fmexpression.cpp
+++ b/xfa/fxfa/fm2js/cxfa_fmexpression.cpp
@@ -44,7 +44,7 @@ CXFA_FMFunctionDefinition::CXFA_FMFunctionDefinition(
 
 CXFA_FMFunctionDefinition::~CXFA_FMFunctionDefinition() = default;
 
-bool CXFA_FMFunctionDefinition::ToJavaScript(CFX_WideTextBuf& js,
+bool CXFA_FMFunctionDefinition::ToJavaScript(CFX_WideTextBuf* js,
                                              ReturnType type) {
   CXFA_FMToJavaScriptDepth depthManager;
   if (CXFA_IsTooBig(js) || !depthManager.IsWithinMaxDepth())
@@ -53,16 +53,16 @@ bool CXFA_FMFunctionDefinition::ToJavaScript(CFX_WideTextBuf& js,
   if (m_wsName.IsEmpty())
     return false;
 
-  js << L"function " << IdentifierToName(m_wsName) << L"(";
+  *js << L"function " << IdentifierToName(m_wsName) << L"(";
   for (const auto& identifier : m_pArguments) {
     if (identifier != m_pArguments.front())
-      js << L", ";
+      *js << L", ";
 
-    js << IdentifierToName(identifier);
+    *js << IdentifierToName(identifier);
   }
-  js << L") {\n";
+  *js << L") {\n";
 
-  js << L"var pfm_ret = null;\n";
+  *js << L"var pfm_ret = null;\n";
   for (const auto& expr : m_pExpressions) {
     ReturnType ret_type = expr == m_pExpressions.back() ? ReturnType::kImplied
                                                         : ReturnType::kInfered;
@@ -70,8 +70,8 @@ bool CXFA_FMFunctionDefinition::ToJavaScript(CFX_WideTextBuf& js,
       return false;
   }
 
-  js << L"return pfm_ret;\n";
-  js << L"}\n";
+  *js << L"return pfm_ret;\n";
+  *js << L"}\n";
 
   return !CXFA_IsTooBig(js);
 }
@@ -82,24 +82,24 @@ CXFA_FMAST::CXFA_FMAST(
 
 CXFA_FMAST::~CXFA_FMAST() = default;
 
-bool CXFA_FMAST::ToJavaScript(CFX_WideTextBuf& js) {
+bool CXFA_FMAST::ToJavaScript(CFX_WideTextBuf* js) {
   if (expressions_.empty()) {
-    js << L"// comments only";
+    *js << L"// comments only";
     return !CXFA_IsTooBig(js);
   }
 
-  js << L"(function() {\n";
-  js << L"let pfm_method_runner = function(obj, cb) {\n";
-  js << L"  if (pfm_rt.is_ary(obj)) {\n";
-  js << L"    let pfm_method_return = null;\n";
-  js << L"    for (var idx = obj.length -1; idx > 1; idx--) {\n";
-  js << L"      pfm_method_return = cb(obj[idx]);\n";
-  js << L"    }\n";
-  js << L"    return pfm_method_return;\n";
-  js << L"  }\n";
-  js << L"  return cb(obj);\n";
-  js << L"};\n";
-  js << L"var pfm_ret = null;\n";
+  *js << L"(function() {\n";
+  *js << L"let pfm_method_runner = function(obj, cb) {\n";
+  *js << L"  if (pfm_rt.is_ary(obj)) {\n";
+  *js << L"    let pfm_method_return = null;\n";
+  *js << L"    for (var idx = obj.length -1; idx > 1; idx--) {\n";
+  *js << L"      pfm_method_return = cb(obj[idx]);\n";
+  *js << L"    }\n";
+  *js << L"    return pfm_method_return;\n";
+  *js << L"  }\n";
+  *js << L"  return cb(obj);\n";
+  *js << L"};\n";
+  *js << L"var pfm_ret = null;\n";
 
   for (const auto& expr : expressions_) {
     ReturnType ret_type = expr == expressions_.back() ? ReturnType::kImplied
@@ -108,8 +108,8 @@ bool CXFA_FMAST::ToJavaScript(CFX_WideTextBuf& js) {
       return false;
   }
 
-  js << L"return pfm_rt.get_val(pfm_ret);\n";
-  js << L"}).call(this);";
+  *js << L"return pfm_rt.get_val(pfm_ret);\n";
+  *js << L"}).call(this);";
   return !CXFA_IsTooBig(js);
 }
 
@@ -120,24 +120,24 @@ CXFA_FMVarExpression::CXFA_FMVarExpression(
 
 CXFA_FMVarExpression::~CXFA_FMVarExpression() = default;
 
-bool CXFA_FMVarExpression::ToJavaScript(CFX_WideTextBuf& js, ReturnType type) {
+bool CXFA_FMVarExpression::ToJavaScript(CFX_WideTextBuf* js, ReturnType type) {
   CXFA_FMToJavaScriptDepth depthManager;
   if (CXFA_IsTooBig(js) || !depthManager.IsWithinMaxDepth())
     return false;
 
   WideString tempName = IdentifierToName(m_wsName);
-  js << L"var " << tempName << L" = ";
+  *js << L"var " << tempName << L" = ";
   if (m_pInit) {
     if (!m_pInit->ToJavaScript(js, ReturnType::kInfered))
       return false;
 
-    js << tempName << L" = pfm_rt.var_filter(" << tempName << L");\n";
+    *js << tempName << L" = pfm_rt.var_filter(" << tempName << L");\n";
   } else {
-    js << L"\"\";\n";
+    *js << L"\"\";\n";
   }
 
   if (type == ReturnType::kImplied)
-    js << L"pfm_ret = " << tempName << L";\n";
+    *js << L"pfm_ret = " << tempName << L";\n";
 
   return !CXFA_IsTooBig(js);
 }
@@ -148,7 +148,7 @@ CXFA_FMExpExpression::CXFA_FMExpExpression(
 
 CXFA_FMExpExpression::~CXFA_FMExpExpression() = default;
 
-bool CXFA_FMExpExpression::ToJavaScript(CFX_WideTextBuf& js, ReturnType type) {
+bool CXFA_FMExpExpression::ToJavaScript(CFX_WideTextBuf* js, ReturnType type) {
   CXFA_FMToJavaScriptDepth depthManager;
   if (CXFA_IsTooBig(js) || !depthManager.IsWithinMaxDepth())
     return false;
@@ -156,7 +156,7 @@ bool CXFA_FMExpExpression::ToJavaScript(CFX_WideTextBuf& js, ReturnType type) {
   if (type == ReturnType::kInfered) {
     bool ret = m_pExpression->ToJavaScript(js, ReturnType::kInfered);
     if (m_pExpression->GetOperatorToken() != TOKassign)
-      js << L";\n";
+      *js << L";\n";
 
     return ret;
   }
@@ -169,19 +169,19 @@ bool CXFA_FMExpExpression::ToJavaScript(CFX_WideTextBuf& js, ReturnType type) {
       m_pExpression->GetOperatorToken() == TOKdotscream ||
       m_pExpression->GetOperatorToken() == TOKdotdot ||
       m_pExpression->GetOperatorToken() == TOKdot) {
-    js << L"pfm_ret = pfm_rt.get_val(";
+    *js << L"pfm_ret = pfm_rt.get_val(";
     if (!m_pExpression->ToJavaScript(js, ReturnType::kInfered))
       return false;
 
-    js << L");\n";
+    *js << L");\n";
     return !CXFA_IsTooBig(js);
   }
 
-  js << L"pfm_ret = ";
+  *js << L"pfm_ret = ";
   if (!m_pExpression->ToJavaScript(js, ReturnType::kInfered))
     return false;
 
-  js << L";\n";
+  *js << L";\n";
   return !CXFA_IsTooBig(js);
 }
 
@@ -191,13 +191,13 @@ CXFA_FMBlockExpression::CXFA_FMBlockExpression(
 
 CXFA_FMBlockExpression::~CXFA_FMBlockExpression() = default;
 
-bool CXFA_FMBlockExpression::ToJavaScript(CFX_WideTextBuf& js,
+bool CXFA_FMBlockExpression::ToJavaScript(CFX_WideTextBuf* js,
                                           ReturnType type) {
   CXFA_FMToJavaScriptDepth depthManager;
   if (CXFA_IsTooBig(js) || !depthManager.IsWithinMaxDepth())
     return false;
 
-  js << L"{\n";
+  *js << L"{\n";
   for (const auto& expr : m_ExpressionList) {
     if (type == ReturnType::kInfered) {
       if (!expr->ToJavaScript(js, ReturnType::kInfered))
@@ -210,7 +210,7 @@ bool CXFA_FMBlockExpression::ToJavaScript(CFX_WideTextBuf& js,
         return false;
     }
   }
-  js << L"}\n";
+  *js << L"}\n";
 
   return !CXFA_IsTooBig(js);
 }
@@ -221,7 +221,7 @@ CXFA_FMDoExpression::CXFA_FMDoExpression(
 
 CXFA_FMDoExpression::~CXFA_FMDoExpression() = default;
 
-bool CXFA_FMDoExpression::ToJavaScript(CFX_WideTextBuf& js, ReturnType type) {
+bool CXFA_FMDoExpression::ToJavaScript(CFX_WideTextBuf* js, ReturnType type) {
   CXFA_FMToJavaScriptDepth depthManager;
   if (CXFA_IsTooBig(js) || !depthManager.IsWithinMaxDepth())
     return false;
@@ -244,18 +244,18 @@ CXFA_FMIfExpression::CXFA_FMIfExpression(
 
 CXFA_FMIfExpression::~CXFA_FMIfExpression() = default;
 
-bool CXFA_FMIfExpression::ToJavaScript(CFX_WideTextBuf& js, ReturnType type) {
+bool CXFA_FMIfExpression::ToJavaScript(CFX_WideTextBuf* js, ReturnType type) {
   CXFA_FMToJavaScriptDepth depthManager;
   if (CXFA_IsTooBig(js) || !depthManager.IsWithinMaxDepth())
     return false;
 
   if (type == ReturnType::kImplied)
-    js << L"pfm_ret = 0;\n";
+    *js << L"pfm_ret = 0;\n";
 
-  js << L"if (pfm_rt.get_val(";
+  *js << L"if (pfm_rt.get_val(";
   if (!m_pExpression->ToJavaScript(js, ReturnType::kInfered))
     return false;
-  js << L"))\n";
+  *js << L"))\n";
 
   if (CXFA_IsTooBig(js))
     return false;
@@ -268,13 +268,13 @@ bool CXFA_FMIfExpression::ToJavaScript(CFX_WideTextBuf& js, ReturnType type) {
   }
 
   for (auto& expr : m_pElseIfExpressions) {
-    js << L"else ";
+    *js << L"else ";
     if (!expr->ToJavaScript(js, ReturnType::kInfered))
       return false;
   }
 
   if (m_pElseExpression) {
-    js << L"else ";
+    *js << L"else ";
     if (!m_pElseExpression->ToJavaScript(js, type))
       return false;
   }
@@ -290,20 +290,20 @@ CXFA_FMWhileExpression::CXFA_FMWhileExpression(
 
 CXFA_FMWhileExpression::~CXFA_FMWhileExpression() = default;
 
-bool CXFA_FMWhileExpression::ToJavaScript(CFX_WideTextBuf& js,
+bool CXFA_FMWhileExpression::ToJavaScript(CFX_WideTextBuf* js,
                                           ReturnType type) {
   CXFA_FMToJavaScriptDepth depthManager;
   if (CXFA_IsTooBig(js) || !depthManager.IsWithinMaxDepth())
     return false;
 
   if (type == ReturnType::kImplied)
-    js << L"pfm_ret = 0;\n";
+    *js << L"pfm_ret = 0;\n";
 
-  js << L"while (";
+  *js << L"while (";
   if (!m_pCondition->ToJavaScript(js, ReturnType::kInfered))
     return false;
 
-  js << L")\n";
+  *js << L")\n";
   if (CXFA_IsTooBig(js))
     return false;
 
@@ -317,13 +317,13 @@ CXFA_FMBreakExpression::CXFA_FMBreakExpression() : CXFA_FMExpression() {}
 
 CXFA_FMBreakExpression::~CXFA_FMBreakExpression() = default;
 
-bool CXFA_FMBreakExpression::ToJavaScript(CFX_WideTextBuf& js,
+bool CXFA_FMBreakExpression::ToJavaScript(CFX_WideTextBuf* js,
                                           ReturnType type) {
   CXFA_FMToJavaScriptDepth depthManager;
   if (CXFA_IsTooBig(js) || !depthManager.IsWithinMaxDepth())
     return false;
 
-  js << L"pfm_ret = 0;\nbreak;\n";
+  *js << L"pfm_ret = 0;\nbreak;\n";
   return !CXFA_IsTooBig(js);
 }
 
@@ -331,13 +331,13 @@ CXFA_FMContinueExpression::CXFA_FMContinueExpression() : CXFA_FMExpression() {}
 
 CXFA_FMContinueExpression::~CXFA_FMContinueExpression() = default;
 
-bool CXFA_FMContinueExpression::ToJavaScript(CFX_WideTextBuf& js,
+bool CXFA_FMContinueExpression::ToJavaScript(CFX_WideTextBuf* js,
                                              ReturnType type) {
   CXFA_FMToJavaScriptDepth depthManager;
   if (CXFA_IsTooBig(js) || !depthManager.IsWithinMaxDepth())
     return false;
 
-  js << L"pfm_ret = 0;\ncontinue;\n";
+  *js << L"pfm_ret = 0;\ncontinue;\n";
   return !CXFA_IsTooBig(js);
 }
 
@@ -358,47 +358,47 @@ CXFA_FMForExpression::CXFA_FMForExpression(
 
 CXFA_FMForExpression::~CXFA_FMForExpression() = default;
 
-bool CXFA_FMForExpression::ToJavaScript(CFX_WideTextBuf& js, ReturnType type) {
+bool CXFA_FMForExpression::ToJavaScript(CFX_WideTextBuf* js, ReturnType type) {
   CXFA_FMToJavaScriptDepth depthManager;
   if (CXFA_IsTooBig(js) || !depthManager.IsWithinMaxDepth())
     return false;
 
   if (type == ReturnType::kImplied)
-    js << L"pfm_ret = 0;\n";
+    *js << L"pfm_ret = 0;\n";
 
-  js << L"{\n";
+  *js << L"{\n";
 
   WideString tmpName = IdentifierToName(m_wsVariant);
-  js << L"var " << tmpName << L" = null;\n";
+  *js << L"var " << tmpName << L" = null;\n";
 
-  js << L"for (" << tmpName << L" = pfm_rt.get_val(";
+  *js << L"for (" << tmpName << L" = pfm_rt.get_val(";
   if (!m_pAssignment->ToJavaScript(js, ReturnType::kInfered))
     return false;
-  js << L"); ";
+  *js << L"); ";
 
-  js << tmpName << (m_bDirection ? kLessEqual : kGreaterEqual);
-  js << L"pfm_rt.get_val(";
+  *js << tmpName << (m_bDirection ? kLessEqual : kGreaterEqual);
+  *js << L"pfm_rt.get_val(";
   if (!m_pAccessor->ToJavaScript(js, ReturnType::kInfered))
     return false;
-  js << L"); ";
+  *js << L"); ";
 
-  js << tmpName << (m_bDirection ? kPlusEqual : kMinusEqual);
+  *js << tmpName << (m_bDirection ? kPlusEqual : kMinusEqual);
   if (m_pStep) {
-    js << L"pfm_rt.get_val(";
+    *js << L"pfm_rt.get_val(";
     if (!m_pStep->ToJavaScript(js, ReturnType::kInfered))
       return false;
-    js << L")";
+    *js << L")";
   } else {
-    js << L"1";
+    *js << L"1";
   }
-  js << L")\n";
+  *js << L")\n";
   if (CXFA_IsTooBig(js))
     return false;
 
   if (!m_pList->ToJavaScript(js, type))
     return false;
 
-  js << L"}\n";
+  *js << L"}\n";
   return !CXFA_IsTooBig(js);
 }
 
@@ -413,35 +413,35 @@ CXFA_FMForeachExpression::CXFA_FMForeachExpression(
 
 CXFA_FMForeachExpression::~CXFA_FMForeachExpression() = default;
 
-bool CXFA_FMForeachExpression::ToJavaScript(CFX_WideTextBuf& js,
+bool CXFA_FMForeachExpression::ToJavaScript(CFX_WideTextBuf* js,
                                             ReturnType type) {
   CXFA_FMToJavaScriptDepth depthManager;
   if (CXFA_IsTooBig(js) || !depthManager.IsWithinMaxDepth())
     return false;
 
   if (type == ReturnType::kImplied)
-    js << L"pfm_ret = 0;\n";
+    *js << L"pfm_ret = 0;\n";
 
-  js << L"{\n";
+  *js << L"{\n";
 
   WideString tmpName = IdentifierToName(m_wsIdentifier);
-  js << L"var " << tmpName << L" = null;\n";
-  js << L"var pfm_ary = pfm_rt.concat_obj(";
+  *js << L"var " << tmpName << L" = null;\n";
+  *js << L"var pfm_ary = pfm_rt.concat_obj(";
   for (const auto& expr : m_pAccessors) {
     if (!expr->ToJavaScript(js, ReturnType::kInfered))
       return false;
     if (expr != m_pAccessors.back())
-      js << L", ";
+      *js << L", ";
   }
-  js << L");\n";
+  *js << L");\n";
 
-  js << L"var pfm_ary_idx = 0;\n";
-  js << L"while(pfm_ary_idx < pfm_ary.length)\n{\n";
-  js << tmpName << L" = pfm_ary[pfm_ary_idx++];\n";
+  *js << L"var pfm_ary_idx = 0;\n";
+  *js << L"while(pfm_ary_idx < pfm_ary.length)\n{\n";
+  *js << tmpName << L" = pfm_ary[pfm_ary_idx++];\n";
   if (!m_pList->ToJavaScript(js, type))
     return false;
-  js << L"}\n";  // while
+  *js << L"}\n";  // while
 
-  js << L"}\n";  // block
+  *js << L"}\n";  // block
   return !CXFA_IsTooBig(js);
 }
diff --git a/xfa/fxfa/fm2js/cxfa_fmexpression.h b/xfa/fxfa/fm2js/cxfa_fmexpression.h
index 32cbf96c95..bff62c185b 100644
--- a/xfa/fxfa/fm2js/cxfa_fmexpression.h
+++ b/xfa/fxfa/fm2js/cxfa_fmexpression.h
@@ -17,7 +17,7 @@ class CFX_WideTextBuf;
 class CXFA_FMExpression {
  public:
   virtual ~CXFA_FMExpression() {}
-  virtual bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) = 0;
+  virtual bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) = 0;
 
  protected:
   CXFA_FMExpression();
@@ -31,7 +31,7 @@ class CXFA_FMFunctionDefinition : public CXFA_FMExpression {
       std::vector<std::unique_ptr<CXFA_FMExpression>>&& expressions);
   ~CXFA_FMFunctionDefinition() override;
 
-  bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) override;
+  bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) override;
 
  private:
   WideStringView m_wsName;
@@ -45,7 +45,7 @@ class CXFA_FMAST {
       std::vector<std::unique_ptr<CXFA_FMExpression>> expressions);
   ~CXFA_FMAST();
 
-  bool ToJavaScript(CFX_WideTextBuf& javascript);
+  bool ToJavaScript(CFX_WideTextBuf* js);
 
  private:
   std::vector<std::unique_ptr<CXFA_FMExpression>> expressions_;
@@ -57,7 +57,7 @@ class CXFA_FMVarExpression : public CXFA_FMExpression {
                        std::unique_ptr<CXFA_FMSimpleExpression> pInit);
   ~CXFA_FMVarExpression() override;
 
-  bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) override;
+  bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) override;
 
  private:
   WideStringView m_wsName;
@@ -70,7 +70,7 @@ class CXFA_FMExpExpression : public CXFA_FMExpression {
       std::unique_ptr<CXFA_FMSimpleExpression> pExpression);
   ~CXFA_FMExpExpression() override;
 
-  bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) override;
+  bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) override;
 
  private:
   std::unique_ptr<CXFA_FMSimpleExpression> m_pExpression;
@@ -82,7 +82,7 @@ class CXFA_FMBlockExpression : public CXFA_FMExpression {
       std::vector<std::unique_ptr<CXFA_FMExpression>>&& pExpressionList);
   ~CXFA_FMBlockExpression() override;
 
-  bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) override;
+  bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) override;
 
  private:
   std::vector<std::unique_ptr<CXFA_FMExpression>> m_ExpressionList;
@@ -93,7 +93,7 @@ class CXFA_FMDoExpression : public CXFA_FMExpression {
   explicit CXFA_FMDoExpression(std::unique_ptr<CXFA_FMExpression> pList);
   ~CXFA_FMDoExpression() override;
 
-  bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) override;
+  bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) override;
 
  private:
   std::unique_ptr<CXFA_FMExpression> m_pList;
@@ -108,7 +108,7 @@ class CXFA_FMIfExpression : public CXFA_FMExpression {
       std::unique_ptr<CXFA_FMExpression> pElseExpression);
   ~CXFA_FMIfExpression() override;
 
-  bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) override;
+  bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) override;
 
  private:
   std::unique_ptr<CXFA_FMSimpleExpression> m_pExpression;
@@ -123,7 +123,7 @@ class CXFA_FMWhileExpression : public CXFA_FMExpression {
                          std::unique_ptr<CXFA_FMExpression> pExpression);
   ~CXFA_FMWhileExpression() override;
 
-  bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) override;
+  bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) override;
 
  private:
   std::unique_ptr<CXFA_FMSimpleExpression> m_pCondition;
@@ -135,7 +135,7 @@ class CXFA_FMBreakExpression : public CXFA_FMExpression {
   CXFA_FMBreakExpression();
   ~CXFA_FMBreakExpression() override;
 
-  bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) override;
+  bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) override;
 };
 
 class CXFA_FMContinueExpression : public CXFA_FMExpression {
@@ -143,7 +143,7 @@ class CXFA_FMContinueExpression : public CXFA_FMExpression {
   CXFA_FMContinueExpression();
   ~CXFA_FMContinueExpression() override;
 
-  bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) override;
+  bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) override;
 };
 
 class CXFA_FMForExpression : public CXFA_FMExpression {
@@ -156,7 +156,7 @@ class CXFA_FMForExpression : public CXFA_FMExpression {
                        std::unique_ptr<CXFA_FMExpression> pList);
   ~CXFA_FMForExpression() override;
 
-  bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) override;
+  bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) override;
 
  private:
   WideStringView m_wsVariant;
@@ -176,7 +176,7 @@ class CXFA_FMForeachExpression : public CXFA_FMExpression {
       std::unique_ptr<CXFA_FMExpression> pList);
   ~CXFA_FMForeachExpression() override;
 
-  bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) override;
+  bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) override;
 
  private:
   WideStringView m_wsIdentifier;
diff --git a/xfa/fxfa/fm2js/cxfa_fmparser_unittest.cpp b/xfa/fxfa/fm2js/cxfa_fmparser_unittest.cpp
index 81fae08384..9a9db21875 100644
--- a/xfa/fxfa/fm2js/cxfa_fmparser_unittest.cpp
+++ b/xfa/fxfa/fm2js/cxfa_fmparser_unittest.cpp
@@ -20,7 +20,7 @@ TEST(CXFA_FMParserTest, Empty) {
 
   CXFA_FMToJavaScriptDepth::Reset();
   CFX_WideTextBuf buf;
-  EXPECT_TRUE(ast->ToJavaScript(buf));
+  EXPECT_TRUE(ast->ToJavaScript(&buf));
   // TODO(dsinclair): This is a little weird .....
   EXPECT_EQ(L"// comments only", buf.AsStringView());
 }
@@ -35,7 +35,7 @@ TEST(CXFA_FMParserTest, CommentOnlyIsError) {
 
   CXFA_FMToJavaScriptDepth::Reset();
   CFX_WideTextBuf buf;
-  EXPECT_TRUE(ast->ToJavaScript(buf));
+  EXPECT_TRUE(ast->ToJavaScript(&buf));
   EXPECT_EQ(L"// comments only", buf.AsStringView());
 }
 
@@ -64,7 +64,7 @@ TEST(CXFA_FMParserTest, CommentThenValue) {
 
   CXFA_FMToJavaScriptDepth::Reset();
   CFX_WideTextBuf buf;
-  EXPECT_TRUE(ast->ToJavaScript(buf));
+  EXPECT_TRUE(ast->ToJavaScript(&buf));
   EXPECT_EQ(ret, buf.AsStringView());
 }
 
@@ -143,7 +143,7 @@ TEST(CXFA_FMParserTest, Parse) {
 
   CXFA_FMToJavaScriptDepth::Reset();
   CFX_WideTextBuf buf;
-  EXPECT_TRUE(ast->ToJavaScript(buf));
+  EXPECT_TRUE(ast->ToJavaScript(&buf));
   EXPECT_EQ(ret, buf.AsStringView());
 }
 
@@ -205,7 +205,7 @@ TEST(CXFA_FMParserTest, ParseFuncWithParams) {
 
   CXFA_FMToJavaScriptDepth::Reset();
   CFX_WideTextBuf buf;
-  EXPECT_TRUE(ast->ToJavaScript(buf));
+  EXPECT_TRUE(ast->ToJavaScript(&buf));
   EXPECT_EQ(ret, buf.AsStringView());
 }
 
@@ -243,7 +243,7 @@ TEST(CXFA_FMParserTest, ParseFuncWithoutParams) {
 
   CXFA_FMToJavaScriptDepth::Reset();
   CFX_WideTextBuf buf;
-  EXPECT_TRUE(ast->ToJavaScript(buf));
+  EXPECT_TRUE(ast->ToJavaScript(&buf));
   EXPECT_EQ(ret, buf.AsStringView());
 }
 
@@ -327,7 +327,7 @@ TEST(CXFA_FMParserTest, ParseCallSmall) {
 
   CXFA_FMToJavaScriptDepth::Reset();
   CFX_WideTextBuf buf;
-  EXPECT_TRUE(ast->ToJavaScript(buf));
+  EXPECT_TRUE(ast->ToJavaScript(&buf));
   EXPECT_EQ(ret, buf.AsStringView());
 }
 
@@ -368,6 +368,6 @@ TEST(CXFA_FMParserTest, ParseCallBig) {
 
   CXFA_FMToJavaScriptDepth::Reset();
   CFX_WideTextBuf buf;
-  EXPECT_TRUE(ast->ToJavaScript(buf));
+  EXPECT_TRUE(ast->ToJavaScript(&buf));
   EXPECT_EQ(ret, buf.AsStringView());
 }
diff --git a/xfa/fxfa/fm2js/cxfa_fmsimpleexpression.cpp b/xfa/fxfa/fm2js/cxfa_fmsimpleexpression.cpp
index e34d4ba127..63d3d6a23b 100644
--- a/xfa/fxfa/fm2js/cxfa_fmsimpleexpression.cpp
+++ b/xfa/fxfa/fm2js/cxfa_fmsimpleexpression.cpp
@@ -80,12 +80,12 @@ XFA_FM_TOKEN CXFA_FMSimpleExpression::GetOperatorToken() const {
 CXFA_FMNullExpression::CXFA_FMNullExpression()
     : CXFA_FMSimpleExpression(TOKnull) {}
 
-bool CXFA_FMNullExpression::ToJavaScript(CFX_WideTextBuf& js, ReturnType type) {
+bool CXFA_FMNullExpression::ToJavaScript(CFX_WideTextBuf* js, ReturnType type) {
   CXFA_FMToJavaScriptDepth depthManager;
   if (CXFA_IsTooBig(js) || !depthManager.IsWithinMaxDepth())
     return false;
 
-  js << L"null";
+  *js << L"null";
   return !CXFA_IsTooBig(js);
 }
 
@@ -94,13 +94,13 @@ CXFA_FMNumberExpression::CXFA_FMNumberExpression(WideStringView wsNumber)
 
 CXFA_FMNumberExpression::~CXFA_FMNumberExpression() = default;
 
-bool CXFA_FMNumberExpression::ToJavaScript(CFX_WideTextBuf& js,
+bool CXFA_FMNumberExpression::ToJavaScript(CFX_WideTextBuf* js,
                                            ReturnType type) {
   CXFA_FMToJavaScriptDepth depthManager;
   if (CXFA_IsTooBig(js) || !depthManager.IsWithinMaxDepth())
     return false;
 
-  js << m_wsNumber;
+  *js << m_wsNumber;
   return !CXFA_IsTooBig(js);
 }
 
@@ -109,7 +109,7 @@ CXFA_FMStringExpression::CXFA_FMStringExpression(WideStringView wsString)
 
 CXFA_FMStringExpression::~CXFA_FMStringExpression() = default;
 
-bool CXFA_FMStringExpression::ToJavaScript(CFX_WideTextBuf& js,
+bool CXFA_FMStringExpression::ToJavaScript(CFX_WideTextBuf* js,
                                            ReturnType type) {
   CXFA_FMToJavaScriptDepth depthManager;
   if (CXFA_IsTooBig(js) || !depthManager.IsWithinMaxDepth())
@@ -117,29 +117,29 @@ bool CXFA_FMStringExpression::ToJavaScript(CFX_WideTextBuf& js,
 
   WideString tempStr(m_wsString);
   if (tempStr.GetLength() <= 2) {
-    js << tempStr;
+    *js << tempStr;
     return !CXFA_IsTooBig(js);
   }
 
-  js << L"\"";
+  *js << L"\"";
   for (size_t i = 1; i < tempStr.GetLength() - 1; i++) {
     wchar_t oneChar = tempStr[i];
     switch (oneChar) {
       case L'\"':
         ++i;
-        js << L"\\\"";
+        *js << L"\\\"";
         break;
       case 0x0d:
         break;
       case 0x0a:
-        js << L"\\n";
+        *js << L"\\n";
         break;
       default:
-        js.AppendChar(oneChar);
+        js->AppendChar(oneChar);
         break;
     }
   }
-  js << L"\"";
+  *js << L"\"";
   return !CXFA_IsTooBig(js);
 }
 
@@ -149,32 +149,33 @@ CXFA_FMIdentifierExpression::CXFA_FMIdentifierExpression(
 
 CXFA_FMIdentifierExpression::~CXFA_FMIdentifierExpression() = default;
 
-bool CXFA_FMIdentifierExpression::ToJavaScript(CFX_WideTextBuf& js,
+bool CXFA_FMIdentifierExpression::ToJavaScript(CFX_WideTextBuf* js,
                                                ReturnType type) {
   CXFA_FMToJavaScriptDepth depthManager;
   if (CXFA_IsTooBig(js) || !depthManager.IsWithinMaxDepth())
     return false;
 
   if (m_wsIdentifier == L"$")
-    js << L"this";
+    *js << L"this";
   else if (m_wsIdentifier == L"!")
-    js << L"xfa.datasets";
+    *js << L"xfa.datasets";
   else if (m_wsIdentifier == L"$data")
-    js << L"xfa.datasets.data";
+    *js << L"xfa.datasets.data";
   else if (m_wsIdentifier == L"$event")
-    js << L"xfa.event";
+    *js << L"xfa.event";
   else if (m_wsIdentifier == L"$form")
-    js << L"xfa.form";
+    *js << L"xfa.form";
   else if (m_wsIdentifier == L"$host")
-    js << L"xfa.host";
+    *js << L"xfa.host";
   else if (m_wsIdentifier == L"$layout")
-    js << L"xfa.layout";
+    *js << L"xfa.layout";
   else if (m_wsIdentifier == L"$template")
-    js << L"xfa.template";
+    *js << L"xfa.template";
   else if (m_wsIdentifier[0] == L'!')
-    js << L"pfm__excl__" + m_wsIdentifier.Right(m_wsIdentifier.GetLength() - 1);
+    *js << L"pfm__excl__" +
+               m_wsIdentifier.Right(m_wsIdentifier.GetLength() - 1);
   else
-    js << m_wsIdentifier;
+    *js << m_wsIdentifier;
 
   return !CXFA_IsTooBig(js);
 }
@@ -189,35 +190,35 @@ CXFA_FMAssignExpression::CXFA_FMAssignExpression(
 
 CXFA_FMAssignExpression::~CXFA_FMAssignExpression() = default;
 
-bool CXFA_FMAssignExpression::ToJavaScript(CFX_WideTextBuf& js,
+bool CXFA_FMAssignExpression::ToJavaScript(CFX_WideTextBuf* js,
                                            ReturnType type) {
   CXFA_FMToJavaScriptDepth depthManager;
   if (CXFA_IsTooBig(js) || !depthManager.IsWithinMaxDepth())
     return false;
 
   CFX_WideTextBuf tempExp1;
-  if (!m_pExp1->ToJavaScript(tempExp1, ReturnType::kInfered))
+  if (!m_pExp1->ToJavaScript(&tempExp1, ReturnType::kInfered))
     return false;
 
-  js << L"if (pfm_rt.is_obj(" << tempExp1 << L"))\n{\n";
+  *js << L"if (pfm_rt.is_obj(" << tempExp1 << L"))\n{\n";
   if (type == ReturnType::kImplied)
-    js << L"pfm_ret = ";
+    *js << L"pfm_ret = ";
 
   CFX_WideTextBuf tempExp2;
-  if (!m_pExp2->ToJavaScript(tempExp2, ReturnType::kInfered))
+  if (!m_pExp2->ToJavaScript(&tempExp2, ReturnType::kInfered))
     return false;
 
-  js << L"pfm_rt.asgn_val_op(" << tempExp1 << L", " << tempExp2 << L");\n}\n";
+  *js << L"pfm_rt.asgn_val_op(" << tempExp1 << L", " << tempExp2 << L");\n}\n";
 
   if (m_pExp1->GetOperatorToken() == TOKidentifier &&
       tempExp1.AsStringView() != L"this") {
-    js << L"else\n{\n";
+    *js << L"else\n{\n";
     if (type == ReturnType::kImplied)
-      js << L"pfm_ret = ";
+      *js << L"pfm_ret = ";
 
-    js << tempExp1 << L" = pfm_rt.asgn_val_op";
-    js << L"(" << tempExp1 << L", " << tempExp2 << L");\n";
-    js << L"}\n";
+    *js << tempExp1 << L" = pfm_rt.asgn_val_op";
+    *js << L"(" << tempExp1 << L", " << tempExp2 << L");\n";
+    *js << L"}\n";
   }
   return !CXFA_IsTooBig(js);
 }
@@ -234,18 +235,18 @@ CXFA_FMBinExpression::CXFA_FMBinExpression(
 
 CXFA_FMBinExpression::~CXFA_FMBinExpression() = default;
 
-bool CXFA_FMBinExpression::ToJavaScript(CFX_WideTextBuf& js, ReturnType type) {
+bool CXFA_FMBinExpression::ToJavaScript(CFX_WideTextBuf* js, ReturnType type) {
   CXFA_FMToJavaScriptDepth depthManager;
   if (CXFA_IsTooBig(js) || !depthManager.IsWithinMaxDepth())
     return false;
 
-  js << L"pfm_rt." << m_OpName << L"(";
+  *js << L"pfm_rt." << m_OpName << L"(";
   if (!m_pExp1->ToJavaScript(js, ReturnType::kInfered))
     return false;
-  js << L", ";
+  *js << L", ";
   if (!m_pExp2->ToJavaScript(js, ReturnType::kInfered))
     return false;
-  js << L")";
+  *js << L")";
   return !CXFA_IsTooBig(js);
 }
 
@@ -365,16 +366,16 @@ CXFA_FMUnaryExpression::CXFA_FMUnaryExpression(
 
 CXFA_FMUnaryExpression::~CXFA_FMUnaryExpression() = default;
 
-bool CXFA_FMUnaryExpression::ToJavaScript(CFX_WideTextBuf& js,
+bool CXFA_FMUnaryExpression::ToJavaScript(CFX_WideTextBuf* js,
                                           ReturnType type) {
   CXFA_FMToJavaScriptDepth depthManager;
   if (CXFA_IsTooBig(js) || !depthManager.IsWithinMaxDepth())
     return false;
 
-  js << L"pfm_rt." << m_OpName.c_str() << L"(";
+  *js << L"pfm_rt." << m_OpName.c_str() << L"(";
   if (!m_pExp->ToJavaScript(js, ReturnType::kInfered))
     return false;
-  js << L")";
+  *js << L")";
   return !CXFA_IsTooBig(js);
 }
 
@@ -434,47 +435,47 @@ uint32_t CXFA_FMCallExpression::IsMethodWithObjParam(
   return 0;
 }
 
-bool CXFA_FMCallExpression::ToJavaScript(CFX_WideTextBuf& js, ReturnType type) {
+bool CXFA_FMCallExpression::ToJavaScript(CFX_WideTextBuf* js, ReturnType type) {
   CXFA_FMToJavaScriptDepth depthManager;
   if (CXFA_IsTooBig(js) || !depthManager.IsWithinMaxDepth())
     return false;
 
   CFX_WideTextBuf funcName;
-  if (!m_pExp->ToJavaScript(funcName, ReturnType::kInfered))
+  if (!m_pExp->ToJavaScript(&funcName, ReturnType::kInfered))
     return false;
 
   if (m_bIsSomMethod) {
-    js << funcName << L"(";
+    *js << funcName << L"(";
     uint32_t methodPara = IsMethodWithObjParam(funcName.MakeString());
     if (methodPara > 0) {
       for (size_t i = 0; i < m_Arguments.size(); ++i) {
         // Currently none of our expressions use objects for a parameter over
         // the 6th. Make sure we don't overflow the shift when doing this
         // check. If we ever need more the 32 object params we can revisit.
-        js << L"pfm_rt.get_";
+        *js << L"pfm_rt.get_";
         if (i < 32 && (methodPara & (0x01 << i)) > 0)
-          js << L"jsobj";
+          *js << L"jsobj";
         else
-          js << L"val";
+          *js << L"val";
 
-        js << L"(";
+        *js << L"(";
         if (!m_Arguments[i]->ToJavaScript(js, ReturnType::kInfered))
           return false;
-        js << L")";
+        *js << L")";
         if (i + 1 < m_Arguments.size())
-          js << L", ";
+          *js << L", ";
       }
     } else {
       for (const auto& expr : m_Arguments) {
-        js << L"pfm_rt.get_val(";
+        *js << L"pfm_rt.get_val(";
         if (!expr->ToJavaScript(js, ReturnType::kInfered))
           return false;
-        js << L")";
+        *js << L")";
         if (expr != m_Arguments.back())
-          js << L", ";
+          *js << L", ";
       }
     }
-    js << L")";
+    *js << L")";
     return !CXFA_IsTooBig(js);
   }
 
@@ -490,38 +491,38 @@ bool CXFA_FMCallExpression::ToJavaScript(CFX_WideTextBuf& js, ReturnType type) {
 
   if (funcName.AsStringView() == L"Eval") {
     isEvalFunc = true;
-    js << L"eval.call(this, pfm_rt.Translate";
+    *js << L"eval.call(this, pfm_rt.Translate";
   } else {
     if (funcName.AsStringView() == L"Exists")
       isExistsFunc = true;
 
-    js << L"pfm_rt." << funcName;
+    *js << L"pfm_rt." << funcName;
   }
 
-  js << L"(";
+  *js << L"(";
   if (isExistsFunc) {
-    js << L"\n(\nfunction ()\n{\ntry\n{\n";
+    *js << L"\n(\nfunction ()\n{\ntry\n{\n";
     if (!m_Arguments.empty()) {
-      js << L"return ";
+      *js << L"return ";
       if (!m_Arguments[0]->ToJavaScript(js, ReturnType::kInfered))
         return false;
-      js << L";\n}\n";
+      *js << L";\n}\n";
     } else {
-      js << L"return 0;\n}\n";
+      *js << L"return 0;\n}\n";
     }
-    js << L"catch(accessExceptions)\n";
-    js << L"{\nreturn 0;\n}\n}\n).call(this)\n";
+    *js << L"catch(accessExceptions)\n";
+    *js << L"{\nreturn 0;\n}\n}\n).call(this)\n";
   } else {
     for (const auto& expr : m_Arguments) {
       if (!expr->ToJavaScript(js, ReturnType::kInfered))
         return false;
       if (expr != m_Arguments.back())
-        js << L", ";
+        *js << L", ";
     }
   }
-  js << L")";
+  *js << L")";
   if (isEvalFunc)
-    js << L")";
+    *js << L")";
 
   return !CXFA_IsTooBig(js);
 }
@@ -538,42 +539,42 @@ CXFA_FMDotAccessorExpression::CXFA_FMDotAccessorExpression(
 
 CXFA_FMDotAccessorExpression::~CXFA_FMDotAccessorExpression() = default;
 
-bool CXFA_FMDotAccessorExpression::ToJavaScript(CFX_WideTextBuf& js,
+bool CXFA_FMDotAccessorExpression::ToJavaScript(CFX_WideTextBuf* js,
                                                 ReturnType type) {
   CXFA_FMToJavaScriptDepth depthManager;
   if (CXFA_IsTooBig(js) || !depthManager.IsWithinMaxDepth())
     return false;
 
-  js << L"pfm_rt.dot_acc(";
+  *js << L"pfm_rt.dot_acc(";
 
   CFX_WideTextBuf tempExp1;
   if (m_pExp1) {
-    if (!m_pExp1->ToJavaScript(tempExp1, ReturnType::kInfered))
+    if (!m_pExp1->ToJavaScript(&tempExp1, ReturnType::kInfered))
       return false;
 
-    js << tempExp1;
+    *js << tempExp1;
   } else {
-    js << L"null";
+    *js << L"null";
   }
-  js << L", \"";
+  *js << L", \"";
 
   if (m_pExp1 && m_pExp1->GetOperatorToken() == TOKidentifier)
-    js << tempExp1;
+    *js << tempExp1;
 
-  js << L"\", ";
+  *js << L"\", ";
   if (m_op == TOKdotscream)
-    js << L"\"#" << m_wsIdentifier << L"\", ";
+    *js << L"\"#" << m_wsIdentifier << L"\", ";
   else if (m_op == TOKdotstar)
-    js << L"\"*\", ";
+    *js << L"\"*\", ";
   else if (m_op == TOKcall)
-    js << L"\"\", ";
+    *js << L"\"\", ";
   else
-    js << L"\"" << m_wsIdentifier << L"\", ";
+    *js << L"\"" << m_wsIdentifier << L"\", ";
 
   if (!m_pExp2->ToJavaScript(js, ReturnType::kInfered))
     return false;
 
-  js << L")";
+  *js << L")";
   return !CXFA_IsTooBig(js);
 }
 
@@ -588,7 +589,7 @@ CXFA_FMIndexExpression::CXFA_FMIndexExpression(
 
 CXFA_FMIndexExpression::~CXFA_FMIndexExpression() = default;
 
-bool CXFA_FMIndexExpression::ToJavaScript(CFX_WideTextBuf& js,
+bool CXFA_FMIndexExpression::ToJavaScript(CFX_WideTextBuf* js,
                                           ReturnType type) {
   CXFA_FMToJavaScriptDepth depthManager;
   if (CXFA_IsTooBig(js) || !depthManager.IsWithinMaxDepth())
@@ -596,29 +597,29 @@ bool CXFA_FMIndexExpression::ToJavaScript(CFX_WideTextBuf& js,
 
   switch (m_accessorIndex) {
     case ACCESSOR_NO_INDEX:
-      js << L"0";
+      *js << L"0";
       break;
     case ACCESSOR_NO_RELATIVEINDEX:
-      js << L"1";
+      *js << L"1";
       break;
     case ACCESSOR_POSITIVE_INDEX:
-      js << L"2";
+      *js << L"2";
       break;
     case ACCESSOR_NEGATIVE_INDEX:
-      js << L"3";
+      *js << L"3";
       break;
     default:
-      js << L"0";
+      *js << L"0";
   }
   if (m_bIsStarIndex)
     return !CXFA_IsTooBig(js);
 
-  js << L", ";
+  *js << L", ";
   if (m_pExp) {
     if (!m_pExp->ToJavaScript(js, ReturnType::kInfered))
       return false;
   } else {
-    js << L"0";
+    *js << L"0";
   }
   return !CXFA_IsTooBig(js);
 }
@@ -635,25 +636,25 @@ CXFA_FMDotDotAccessorExpression::CXFA_FMDotDotAccessorExpression(
 
 CXFA_FMDotDotAccessorExpression::~CXFA_FMDotDotAccessorExpression() = default;
 
-bool CXFA_FMDotDotAccessorExpression::ToJavaScript(CFX_WideTextBuf& js,
+bool CXFA_FMDotDotAccessorExpression::ToJavaScript(CFX_WideTextBuf* js,
                                                    ReturnType type) {
   CXFA_FMToJavaScriptDepth depthManager;
   if (CXFA_IsTooBig(js) || !depthManager.IsWithinMaxDepth())
     return false;
 
-  js << L"pfm_rt.dotdot_acc(";
+  *js << L"pfm_rt.dotdot_acc(";
   if (!m_pExp1->ToJavaScript(js, ReturnType::kInfered))
     return false;
-  js << L", " << L"\"";
+  *js << L", " << L"\"";
   if (m_pExp1->GetOperatorToken() == TOKidentifier) {
     if (!m_pExp1->ToJavaScript(js, ReturnType::kInfered))
       return false;
   }
 
-  js << L"\", \"" << m_wsIdentifier << L"\", ";
+  *js << L"\", \"" << m_wsIdentifier << L"\", ";
   if (!m_pExp2->ToJavaScript(js, ReturnType::kInfered))
     return false;
-  js << L")";
+  *js << L")";
   return !CXFA_IsTooBig(js);
 }
 
@@ -666,27 +667,27 @@ CXFA_FMMethodCallExpression::CXFA_FMMethodCallExpression(
 
 CXFA_FMMethodCallExpression::~CXFA_FMMethodCallExpression() = default;
 
-bool CXFA_FMMethodCallExpression::ToJavaScript(CFX_WideTextBuf& js,
+bool CXFA_FMMethodCallExpression::ToJavaScript(CFX_WideTextBuf* js,
                                                ReturnType type) {
   CXFA_FMToJavaScriptDepth depthManager;
   if (CXFA_IsTooBig(js) || !depthManager.IsWithinMaxDepth())
     return false;
 
   CFX_WideTextBuf buf;
-  if (!m_pExp1->ToJavaScript(buf, ReturnType::kInfered))
+  if (!m_pExp1->ToJavaScript(&buf, ReturnType::kInfered))
     return false;
 
-  js << L"(function() {\n";
-  js << L"  return pfm_method_runner(" << buf << L", function(obj) {\n";
-  js << L"    return obj.";
+  *js << L"(function() {\n";
+  *js << L"  return pfm_method_runner(" << buf << L", function(obj) {\n";
+  *js << L"    return obj.";
   if (!m_pExp2->ToJavaScript(js, ReturnType::kInfered))
     return false;
-  js << L";\n";
-  js << L"  });\n";
-  js << L"}).call(this)";
+  *js << L";\n";
+  *js << L"  });\n";
+  *js << L"}).call(this)";
   return !CXFA_IsTooBig(js);
 }
 
-bool CXFA_IsTooBig(const CFX_WideTextBuf& javascript) {
-  return javascript.GetSize() >= 256 * 1024 * 1024;
+bool CXFA_IsTooBig(const CFX_WideTextBuf* js) {
+  return js->GetSize() >= 256 * 1024 * 1024;
 }
diff --git a/xfa/fxfa/fm2js/cxfa_fmsimpleexpression.h b/xfa/fxfa/fm2js/cxfa_fmsimpleexpression.h
index ede48ec2b6..0f3df31081 100644
--- a/xfa/fxfa/fm2js/cxfa_fmsimpleexpression.h
+++ b/xfa/fxfa/fm2js/cxfa_fmsimpleexpression.h
@@ -26,7 +26,7 @@ class CFX_WideTextBuf;
 class CXFA_FMSimpleExpression {
  public:
   virtual ~CXFA_FMSimpleExpression() {}
-  virtual bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) = 0;
+  virtual bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) = 0;
 
   XFA_FM_TOKEN GetOperatorToken() const;
 
@@ -41,7 +41,7 @@ class CXFA_FMNullExpression : public CXFA_FMSimpleExpression {
   CXFA_FMNullExpression();
   ~CXFA_FMNullExpression() override {}
 
-  bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) override;
+  bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) override;
 };
 
 class CXFA_FMNumberExpression : public CXFA_FMSimpleExpression {
@@ -49,7 +49,7 @@ class CXFA_FMNumberExpression : public CXFA_FMSimpleExpression {
   explicit CXFA_FMNumberExpression(WideStringView wsNumber);
   ~CXFA_FMNumberExpression() override;
 
-  bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) override;
+  bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) override;
 
  private:
   WideStringView m_wsNumber;
@@ -60,7 +60,7 @@ class CXFA_FMStringExpression : public CXFA_FMSimpleExpression {
   explicit CXFA_FMStringExpression(WideStringView wsString);
   ~CXFA_FMStringExpression() override;
 
-  bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) override;
+  bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) override;
 
  private:
   WideStringView m_wsString;
@@ -71,7 +71,7 @@ class CXFA_FMIdentifierExpression : public CXFA_FMSimpleExpression {
   explicit CXFA_FMIdentifierExpression(WideStringView wsIdentifier);
   ~CXFA_FMIdentifierExpression() override;
 
-  bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) override;
+  bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) override;
 
  private:
   WideStringView m_wsIdentifier;
@@ -84,7 +84,7 @@ class CXFA_FMAssignExpression : public CXFA_FMSimpleExpression {
                           std::unique_ptr<CXFA_FMSimpleExpression> pExp2);
   ~CXFA_FMAssignExpression() override;
 
-  bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) override;
+  bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) override;
 
  private:
   std::unique_ptr<CXFA_FMSimpleExpression> m_pExp1;
@@ -95,7 +95,7 @@ class CXFA_FMBinExpression : public CXFA_FMSimpleExpression {
  public:
   ~CXFA_FMBinExpression() override;
 
-  bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) override;
+  bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) override;
 
  protected:
   CXFA_FMBinExpression(const WideString& opName,
@@ -209,7 +209,7 @@ class CXFA_FMUnaryExpression : public CXFA_FMSimpleExpression {
  public:
   ~CXFA_FMUnaryExpression() override;
 
-  bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) override;
+  bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) override;
 
  protected:
   CXFA_FMUnaryExpression(const WideString& opName,
@@ -249,7 +249,7 @@ class CXFA_FMCallExpression : public CXFA_FMSimpleExpression {
 
   bool IsBuiltInFunc(CFX_WideTextBuf* funcName);
   uint32_t IsMethodWithObjParam(const WideString& methodName);
-  bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) override;
+  bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) override;
 
  private:
   std::unique_ptr<CXFA_FMSimpleExpression> m_pExp;
@@ -266,7 +266,7 @@ class CXFA_FMDotAccessorExpression : public CXFA_FMSimpleExpression {
       std::unique_ptr<CXFA_FMSimpleExpression> pIndexExp);
   ~CXFA_FMDotAccessorExpression() override;
 
-  bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) override;
+  bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) override;
 
  private:
   WideStringView m_wsIdentifier;
@@ -281,7 +281,7 @@ class CXFA_FMIndexExpression : public CXFA_FMSimpleExpression {
                          bool bIsStarIndex);
   ~CXFA_FMIndexExpression() override;
 
-  bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) override;
+  bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) override;
 
  private:
   std::unique_ptr<CXFA_FMSimpleExpression> m_pExp;
@@ -298,7 +298,7 @@ class CXFA_FMDotDotAccessorExpression : public CXFA_FMSimpleExpression {
       std::unique_ptr<CXFA_FMSimpleExpression> pIndexExp);
   ~CXFA_FMDotDotAccessorExpression() override;
 
-  bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) override;
+  bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) override;
 
  private:
   WideStringView m_wsIdentifier;
@@ -313,13 +313,13 @@ class CXFA_FMMethodCallExpression : public CXFA_FMSimpleExpression {
       std::unique_ptr<CXFA_FMSimpleExpression> pCallExp);
   ~CXFA_FMMethodCallExpression() override;
 
-  bool ToJavaScript(CFX_WideTextBuf& javascript, ReturnType type) override;
+  bool ToJavaScript(CFX_WideTextBuf* js, ReturnType type) override;
 
  private:
   std::unique_ptr<CXFA_FMSimpleExpression> m_pExp1;
   std::unique_ptr<CXFA_FMSimpleExpression> m_pExp2;
 };
 
-bool CXFA_IsTooBig(const CFX_WideTextBuf& javascript);
+bool CXFA_IsTooBig(const CFX_WideTextBuf* js);
 
 #endif  // XFA_FXFA_FM2JS_CXFA_FMSIMPLEEXPRESSION_H_
diff --git a/xfa/fxfa/fm2js/cxfa_fmsimpleexpression_unittest.cpp b/xfa/fxfa/fm2js/cxfa_fmsimpleexpression_unittest.cpp
index 3ff2b411f9..e5f78aaa56 100644
--- a/xfa/fxfa/fm2js/cxfa_fmsimpleexpression_unittest.cpp
+++ b/xfa/fxfa/fm2js/cxfa_fmsimpleexpression_unittest.cpp
@@ -27,7 +27,7 @@ TEST(FMCallExpressionTest, more_than_32_arguments) {
   CXFA_FMCallExpression callExp(std::move(exp), std::move(args), true);
 
   CFX_WideTextBuf js;
-  callExp.ToJavaScript(js, ReturnType::kInfered);
+  callExp.ToJavaScript(&js, ReturnType::kInfered);
 
   // Generate the result javascript string.
   WideString result = L"sign(";
@@ -50,21 +50,22 @@ TEST(FMCallExpressionTest, more_than_32_arguments) {
 TEST(FMStringExpressionTest, Empty) {
   CXFA_FMToJavaScriptDepth::Reset();
   CFX_WideTextBuf accumulator;
-  CXFA_FMStringExpression(L"").ToJavaScript(accumulator, ReturnType::kInfered);
+  CXFA_FMStringExpression(L"").ToJavaScript(&accumulator, ReturnType::kInfered);
   EXPECT_EQ(L"", accumulator.AsStringView());
 }
 
 TEST(FMStringExpressionTest, Short) {
   CXFA_FMToJavaScriptDepth::Reset();
   CFX_WideTextBuf accumulator;
-  CXFA_FMStringExpression(L"a").ToJavaScript(accumulator, ReturnType::kInfered);
+  CXFA_FMStringExpression(L"a").ToJavaScript(&accumulator,
+                                             ReturnType::kInfered);
   EXPECT_EQ(L"a", accumulator.AsStringView());
 }
 
 TEST(FMStringExpressionTest, Medium) {
   CXFA_FMToJavaScriptDepth::Reset();
   CFX_WideTextBuf accumulator;
-  CXFA_FMStringExpression(L".abcd.").ToJavaScript(accumulator,
+  CXFA_FMStringExpression(L".abcd.").ToJavaScript(&accumulator,
                                                   ReturnType::kInfered);
   EXPECT_EQ(L"\"abcd\"", accumulator.AsStringView());
 }
@@ -74,7 +75,7 @@ TEST(FMStringExpressionTest, Long) {
   CFX_WideTextBuf accumulator;
   std::vector<WideStringView::UnsignedType> vec(140000, L'A');
   CXFA_FMStringExpression(WideStringView(vec))
-      .ToJavaScript(accumulator, ReturnType::kInfered);
+      .ToJavaScript(&accumulator, ReturnType::kInfered);
   EXPECT_EQ(140000u, accumulator.GetLength());
 }
 
@@ -82,6 +83,6 @@ TEST(FMStringExpressionTest, Quoted) {
   CXFA_FMToJavaScriptDepth::Reset();
   CFX_WideTextBuf accumulator;
   CXFA_FMStringExpression(L".Simon says \"\"run\"\".")
-      .ToJavaScript(accumulator, ReturnType::kInfered);
+      .ToJavaScript(&accumulator, ReturnType::kInfered);
   EXPECT_EQ(L"\"Simon says \\\"run\\\"\"", accumulator.AsStringView());
 }