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https://github.com/SquidDev-CC/CC-Tweaked
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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.
67 lines
1.6 KiB
Java
67 lines
1.6 KiB
Java
/*
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* This file is part of the public ComputerCraft API - http://www.computercraft.info
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* Copyright Daniel Ratcliffe, 2011-2020. This API may be redistributed unmodified and in full only.
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* For help using the API, and posting your mods, visit the forums at computercraft.info.
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*/
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package dan200.computercraft.api.lua;
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import javax.annotation.Nullable;
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import java.util.Arrays;
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import java.util.List;
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import java.util.Objects;
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/**
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* An implementation of {@link IArguments} which wraps an array of {@link Object}.
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*/
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public final class ObjectArguments implements IArguments
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{
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private static final IArguments EMPTY = new ObjectArguments();
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private final List<Object> args;
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@Deprecated
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@SuppressWarnings( "unused" )
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public ObjectArguments( IArguments arguments )
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{
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throw new IllegalStateException();
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}
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public ObjectArguments( Object... args )
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{
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this.args = Arrays.asList( args );
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}
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public ObjectArguments( List<Object> args )
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{
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this.args = Objects.requireNonNull( args );
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}
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@Override
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public int count()
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{
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return args.size();
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}
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@Override
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public IArguments drop( int count )
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{
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if( count < 0 ) throw new IllegalStateException( "count cannot be negative" );
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if( count == 0 ) return this;
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if( count >= args.size() ) return EMPTY;
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return new ObjectArguments( args.subList( count, args.size() ) );
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}
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@Nullable
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@Override
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public Object get( int index )
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{
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return index >= args.size() ? null : args.get( index );
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}
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@Override
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public Object[] getAll()
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{
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return args.toArray();
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}
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}
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