Issue 6526 - Use the maybe version of Compile() and Run()

src/JsError.cpp

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include "JsError.h"
 
 using namespace AdblockPlus;
 
 JsError::JsError(v8::Isolate* isolate, const v8::Local<v8::Value>& exception,
     const v8::Local<v8::Message>& message)
   : std::runtime_error(ExceptionToString(isolate, exception, message))
 {
 }
 
-std::string JsError::ExceptionToString(v8::Isolate* isolate,
-  const v8::Local<v8::Value>& exception,
+std::string JsError::ExceptionToString(v8::Isolate* isolate, const v8::Local<v8::Value>& exception,
   const v8::Local<v8::Message>& message)
 {
   std::stringstream error;
   error << *v8::String::Utf8Value(isolate, exception);
   if (!message.IsEmpty())
   {
     error << " at ";
     error << *v8::String::Utf8Value(isolate, message->GetScriptResourceName());
     error << ":";
-    auto lineNumber = message->GetLineNumber(isolate->GetCurrentContext());
-    if (lineNumber.IsJust())
-      error << lineNumber.FromJust();
+    auto maybeLineNumber = message->GetLineNumber(isolate->GetCurrentContext());
+    int lineNumber = 0;
+    if (maybeLineNumber.To(&lineNumber))
+      error << lineNumber;
     else
-      error << "<unknown>";
+      error << "unknown line";
   }
   return error.str();
 }
 
 JsError::JsError(const char* message, const char* filename, int line)
   : std::runtime_error(ErrorToString(message, filename, line))
 {
 }
 
 std::string JsError::ErrorToString(const char* message, const char* filename, int line)
 {
   std::stringstream error;
   error << message;
   error << filename;
   error << ":";
   error << line;
   return error.str();
 }