3

I have precompiled Lua script with ScriptEngine.

private void preCompile(){
    ScriptEngineManager manager = new ScriptEngineManager();
    engine = manager.getEngineByName("luaj");
    if(engine instanceof Compilable){
        try {
            compScript = ((Compilable)engine).compile(scriptContent);
        }catch (ScriptException se){
            System.err.println(se.getMessage());
        }
    }else{
        System.err.println("Engine can't compile code!");
    }

And I can also execute it with eval() function and call the functions in the Script with LuaFunction.invoke(LuaValue).

public Object callFunction(String funcName, Object[] args){
    preCompile();
    Bindings script_bindings = new SimpleBindings();
    try{
        compScript.eval(script_bindings);
        LuaFunction luafunc = (LuaFunction)script_bindings.get(funcName);
        LuaValue[] luaValues = new LuaValue[args.length];
        for(int i = 0; i < args.length; ++i){
            luaValues[i] = CoerceJavaToLua.coerce(args[i]);
        }
        result = luafunc.invoke(luaValues);
    }catch (ScriptException se){
        System.out.println(se.getMessage());
    }
    return result;
}

Here Is The Problem:

I can executed script with Java API, but what I want to do is making a custom environment by using Global.

so I create Global object and load needed libs like this:

private void LoadScript(){
    globals = new Globals();
    globals.load(new JseBaseLib());
    globals.load(new PackageLib());
    globals.load(new StringLib());
    globals.load(new Bit32Lib());
    globals.load(new TableLib());
    LoadState.install(globals);
    LuaC.install(globals);

Now I just don't know how to link 'globals' to the compiled file(compScript). I have tried the global compiled function

Prototype chunk = globals.compilePrototype(new StringReader(script), "script");

chunk.call() can be used to execute script, but I still don't know how to call the functions(with or without arguments) in script by 'chunk' or 'compScript' in my custom 'globals' environment.

In addition, is globals.load() function compile script file? I just want to compile script once and reuse it.

ROMANIA_engineer
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RayEden
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2 Answers2

0

The chunk must be obtained with globals.load. Then you can call the chunk and get the lua function you want from the globals, assuming your function is defined as a global. If it is local, you cannot use it.

LuaValue chunk = globals.load(script, "script");
chunk.call();
LuaValue func = globals.get(functionName);
func.call(args);
Jay WrightWay
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  • They're using their own ScriptEngine, they don't have access to the globals in that regard. They're asking how they can set the globals for said ScriptEngine themselves. – ioi-xd Jan 05 '23 at 05:42
0

The class LuajContext has an exposed, public globals value (source code reference). By getting the context from the engine and casting it to LuajContext, you can work with the table (you should not need to create your own globals, by the way; the defaults are constructed in the context's constructor)

LuajContext context = (LuajContext) e.getContext();
System.out.println(context.globals);
ioi-xd
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