Refactor LuaContext into a separate class

This isn't tied to Cobalt any more!

src/main/java/dan200/computercraft/core/lua/CobaltLuaMachine.java

@@ -10,7 +10,6 @@ import dan200.computercraft.api.lua.*;
 import dan200.computercraft.core.asm.LuaMethod;
 import dan200.computercraft.core.asm.ObjectSource;
 import dan200.computercraft.core.computer.Computer;
-import dan200.computercraft.core.computer.MainThread;
 import dan200.computercraft.core.computer.TimeoutState;
 import dan200.computercraft.core.tracking.Tracking;
 import dan200.computercraft.core.tracking.TrackingField;
@@ -53,7 +52,7 @@ public class CobaltLuaMachine implements ILuaMachine
     private final Computer computer;
     private final TimeoutState timeout;
     private final TimeoutDebugHandler debug;
-    private final ILuaContext context = new CobaltLuaContext();
+    private final ILuaContext context;
 
     private LuaState state;
     private LuaTable globals;
@@ -65,6 +64,7 @@ public class CobaltLuaMachine implements ILuaMachine
     {
         this.computer = computer;
         this.timeout = timeout;
+        this.context = new LuaContext( computer );
         debug = new TimeoutDebugHandler();
 
         // Create an environment to run in
@@ -509,53 +509,6 @@ public class CobaltLuaMachine implements ILuaMachine
         }
     }
 
-    private class CobaltLuaContext implements ILuaContext
-    {
-        @Override
-        public long issueMainThreadTask( @Nonnull final ILuaTask task ) throws LuaException
-        {
-            // Issue command
-            final long taskID = MainThread.getUniqueTaskID();
-            final Runnable iTask = () -> {
-                try
-                {
-                    Object[] results = task.execute();
-                    if( results != null )
-                    {
-                        Object[] eventArguments = new Object[results.length + 2];
-                        eventArguments[0] = taskID;
-                        eventArguments[1] = true;
-                        System.arraycopy( results, 0, eventArguments, 2, results.length );
-                        computer.queueEvent( "task_complete", eventArguments );
-                    }
-                    else
-                    {
-                        computer.queueEvent( "task_complete", new Object[] { taskID, true } );
-                    }
-                }
-                catch( LuaException e )
-                {
-                    computer.queueEvent( "task_complete", new Object[] { taskID, false, e.getMessage() } );
-                }
-                catch( Throwable t )
-                {
-                    if( ComputerCraft.logComputerErrors ) ComputerCraft.log.error( "Error running task", t );
-                    computer.queueEvent( "task_complete", new Object[] {
-                        taskID, false, "Java Exception Thrown: " + t,
-                    } );
-                }
-            };
-            if( computer.queueMainThread( iTask ) )
-            {
-                return taskID;
-            }
-            else
-            {
-                throw new LuaException( "Task limit exceeded" );
-            }
-        }
-    }
-
     private static final class HardAbortError extends Error
     {
         private static final long serialVersionUID = 7954092008586367501L;

src/main/java/dan200/computercraft/core/lua/LuaContext.java

@@ -0,0 +1,69 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+package dan200.computercraft.core.lua;
+
+import dan200.computercraft.ComputerCraft;
+import dan200.computercraft.api.lua.ILuaContext;
+import dan200.computercraft.api.lua.ILuaTask;
+import dan200.computercraft.api.lua.LuaException;
+import dan200.computercraft.core.computer.Computer;
+import dan200.computercraft.core.computer.MainThread;
+
+import javax.annotation.Nonnull;
+
+class LuaContext implements ILuaContext
+{
+    private final Computer computer;
+
+    LuaContext( Computer computer )
+    {
+        this.computer = computer;
+    }
+
+    @Override
+    public long issueMainThreadTask( @Nonnull final ILuaTask task ) throws LuaException
+    {
+        // Issue command
+        final long taskID = MainThread.getUniqueTaskID();
+        final Runnable iTask = () -> {
+            try
+            {
+                Object[] results = task.execute();
+                if( results != null )
+                {
+                    Object[] eventArguments = new Object[results.length + 2];
+                    eventArguments[0] = taskID;
+                    eventArguments[1] = true;
+                    System.arraycopy( results, 0, eventArguments, 2, results.length );
+                    computer.queueEvent( "task_complete", eventArguments );
+                }
+                else
+                {
+                    computer.queueEvent( "task_complete", new Object[] { taskID, true } );
+                }
+            }
+            catch( LuaException e )
+            {
+                computer.queueEvent( "task_complete", new Object[] { taskID, false, e.getMessage() } );
+            }
+            catch( Exception t )
+            {
+                if( ComputerCraft.logComputerErrors ) ComputerCraft.log.error( "Error running task", t );
+                computer.queueEvent( "task_complete", new Object[] {
+                    taskID, false, "Java Exception Thrown: " + t,
+                } );
+            }
+        };
+        if( computer.queueMainThread( iTask ) )
+        {
+            return taskID;
+        }
+        else
+        {
+            throw new LuaException( "Task limit exceeded" );
+        }
+    }
+}