mirror of
https://github.com/SquidDev-CC/CC-Tweaked
synced 2025-07-16 17:02:52 +00:00
d5f82fa458
When creating a peripheral or custom Lua object, one must implement two
methods:
- getMethodNames(): String[] - Returns the name of the methods
- callMethod(int, ...): Object[] - Invokes the method using an index in
the above array.
This has a couple of problems:
- It's somewhat unwieldy to use - you need to keep track of array
indices, which leads to ugly code.
- Functions which yield (for instance, those which run on the main
thread) are blocking. This means we need to spawn new threads for
each CC-side yield.
We replace this system with a few changes:
- @LuaFunction annotation: One may annotate a public instance method
with this annotation. This then exposes a peripheral/lua object
method.
Furthermore, this method can accept and return a variety of types,
which often makes functions cleaner (e.g. can return an int rather
than an Object[], and specify and int argument rather than
Object[]).
- MethodResult: Instead of returning an Object[] and having blocking
yields, functions return a MethodResult. This either contains an
immediate return, or an instruction to yield with some continuation
to resume with.
MethodResult is then interpreted by the Lua runtime (i.e. Cobalt),
rather than our weird bodgey hacks before. This means we no longer
spawn new threads when yielding within CC.
- Methods accept IArguments instead of a raw Object array. This has a
few benefits:
- Consistent argument handling - people no longer need to use
ArgumentHelper (as it doesn't exist!), or even be aware of its
existence - you're rather forced into using it.
- More efficient code in some cases. We provide a Cobalt-specific
implementation of IArguments, which avoids the boxing/unboxing when
handling numbers and binary strings.
68 lines
2.2 KiB
Java
68 lines
2.2 KiB
Java
/*
|
|
* This file is part of ComputerCraft - http://www.computercraft.info
|
|
* Copyright Daniel Ratcliffe, 2011-2020. Do not distribute without permission.
|
|
* Send enquiries to dratcliffe@gmail.com
|
|
*/
|
|
package dan200.computercraft.core.apis;
|
|
|
|
import dan200.computercraft.api.lua.*;
|
|
import dan200.computercraft.core.asm.LuaMethod;
|
|
import dan200.computercraft.core.asm.NamedMethod;
|
|
|
|
import javax.annotation.Nonnull;
|
|
import java.util.HashMap;
|
|
import java.util.List;
|
|
import java.util.Map;
|
|
import java.util.Objects;
|
|
|
|
public class ObjectWrapper implements ILuaContext
|
|
{
|
|
private final Object object;
|
|
private final Map<String, LuaMethod> methodMap;
|
|
|
|
public ObjectWrapper( Object object )
|
|
{
|
|
this.object = object;
|
|
String[] dynamicMethods = object instanceof IDynamicLuaObject
|
|
? Objects.requireNonNull( ((IDynamicLuaObject) object).getMethodNames(), "Methods cannot be null" )
|
|
: LuaMethod.EMPTY_METHODS;
|
|
|
|
List<NamedMethod<LuaMethod>> methods = LuaMethod.GENERATOR.getMethods( object.getClass() );
|
|
|
|
Map<String, LuaMethod> methodMap = this.methodMap = new HashMap<>( methods.size() + dynamicMethods.length );
|
|
for( int i = 0; i < dynamicMethods.length; i++ )
|
|
{
|
|
methodMap.put( dynamicMethods[i], LuaMethod.DYNAMIC.get( i ) );
|
|
}
|
|
for( NamedMethod<LuaMethod> method : methods )
|
|
{
|
|
methodMap.put( method.getName(), method.getMethod() );
|
|
}
|
|
}
|
|
|
|
public Object[] call( String name, Object... args ) throws LuaException
|
|
{
|
|
LuaMethod method = methodMap.get( name );
|
|
if( method == null ) throw new IllegalStateException( "No such method '" + name + "'" );
|
|
|
|
return method.apply( object, this, new ObjectArguments( args ) ).getResult();
|
|
}
|
|
|
|
@SuppressWarnings( "unchecked" )
|
|
public <T> T callOf( String name, Object... args ) throws LuaException
|
|
{
|
|
return (T) call( name, args )[0];
|
|
}
|
|
|
|
public <T> T callOf( Class<T> klass, String name, Object... args ) throws LuaException
|
|
{
|
|
return klass.cast( call( name, args )[0] );
|
|
}
|
|
|
|
@Override
|
|
public long issueMainThreadTask( @Nonnull ILuaTask task )
|
|
{
|
|
throw new IllegalStateException( "Method should never queue events" );
|
|
}
|
|
}
|