Examples of org.luaj.vm2.LuaClosure

org.luaj.vm2.lib.OneArgFunction
Extension of {@link LuaFunction} which executes lua bytecode.
A {@link LuaClosure} is a combination of a {@link Prototype} and a {@link LuaValue} to use as an environment for execution.
There are three main ways {@link LuaClosure} instances are created:
- Construct an instance using {@link #LuaClosure(Prototype,LuaValue)}
- Construct it indirectly by loading a chunk via {@link LuaCompiler#load(java.io.InputStream,String,LuaValue)}
- Execute the lua bytecode {@link Lua#OP_CLOSURE} as part of bytecode processing
To construct it directly, the {@link Prototype} is typically created via a compiler such as {@link LuaC}:
```
  {@code InputStream is = new ByteArrayInputStream("print('hello,world').getBytes()); Prototype p = LuaC.instance.compile(is, "script"); LuaValue _G = JsePlatform.standardGlobals() LuaClosure f = new LuaClosure(p, _G);}
```
To construct it indirectly, the {@link LuaC} compiler may be used, which implements the {@link LuaCompiler} interface:
```
  {@code LuaFunction f = LuaC.instance.load(is, "script", _G);}
```
Typically, a closure that has just been loaded needs to be initialized by executing it, and its return value can be saved if needed:
```
  {@code LuaValue r = f.call(); _G.set( "mypkg", r ) }
```
In the preceding, the loaded value is typed as {@link LuaFunction} to allow for the possibility of other compilers such as {@link LuaJC}producing {@link LuaFunction} directly without creating a {@link Prototype} or {@link LuaClosure}.
Since a {@link LuaClosure} is a {@link LuaFunction} which is a {@link LuaValue}, all the value operations can be used directly such as:
- {@link LuaValue#setfenv(LuaValue)}
- {@link LuaValue#call()}
- {@link LuaValue#call(LuaValue)}
- {@link LuaValue#invoke()}
- {@link LuaValue#invoke(Varargs)}
- {@link LuaValue#method(String)}
- {@link LuaValue#method(String,LuaValue)}
- {@link LuaValue#invokemethod(String)}
- {@link LuaValue#invokemethod(String,Varargs)}
- ...
@see LuaValue @see LuaFunction @see LuaValue#isclosure() @see LuaValue#checkclosure() @see LuaValue#optclosure(LuaClosure) @see LoadState @see LoadState#compiler


                // Traverse the directions table.
                LuaValue key = LuaValue.NIL;
                while (true) {


                    Varargs keyValue = directionsTable.next(key);
                    key = keyValue.arg1();
                    if (key.isnil()) {
                        break;
                    }
                    LuaValue directionTable = keyValue.arg(2);


                    int x = directionTable.get("x").checkint();
                    int y = directionTable.get("y").checkint();
                    int frameWidth = directionTable.get("frame_width").checkint();
                    int frameHeight = directionTable.get("frame_height").checkint();

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        final int testCount        = tests.get("count").toint();
        final LuaValue provideFunc = tests.get("provide");
        final LuaValue runFunc     = tests.get("run");


        for (int i=1; i<testCount+1; i++) {
            final Varargs provideValue = provideFunc.invoke(valueOf(i));
            final LuaValue name = provideValue.arg(2);
            final String expected = provideValue.arg(3).checkjstring();


            Description testDescription = Description.createTestDescription(getClass(), name.toString());


            if (isIgnored(testDescription)) {
                notifier.fireTestIgnored(testDescription);

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        return table;
    }


    private LuaValue getUrl() {


        return new LibFunction() {
            /**
             *  $text, $which, $query = null, $proto = null
             */
            @Override public Varargs invoke(Varargs args) {
                return NIL;

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         * @param $ns           string|int Namespace
         * @param $text         string Title text
         * @param $fragment     string URI fragment
         * @param $interwiki    string Interwiki code
         */
        return new LibFunction() {
            @Override
            public Varargs invoke(Varargs args) {
                LuaValue ns    = args.arg(1);
                LuaValue title = args.arg(2);
                LuaValue fragment = args.arg(3);

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        }
        return frame;
    }


    private LuaValue getFrameTitle() {
        return new OneArgFunction() {
            @Override
            public LuaValue call(LuaValue arg) {
                return valueOf("getFrameTitleNotImplemented");
            }
        };

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            }
        };
    }


    private LuaValue getAllExpandedArguments() {
        return new OneArgFunction() {
            @Override public LuaValue call(LuaValue frameId) {
                return getFrameById(frameId).getAllArguments();
            }
        };
    }

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            }
        };
    }


    private LuaValue frameExists() {
        return new OneArgFunction() {
            @Override
            public LuaValue call(LuaValue arg) {
                // logger.debug("frameExists(" + arg + ")");
                return TRUE;
            }

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            }
        };
    }


    private OneArgFunction loadPackage() {
        return new OneArgFunction() {
            @Override
            public LuaValue call(LuaValue arg) {
                String name = arg.tojstring();


                InputStream is = loadLocally(name);

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            @Override
            public LuaValue call(LuaValue f, LuaValue env) {
                return f;
            }
        });
        globals.set("gefenv", new OneArgFunction() {
            public LuaValue call(LuaValue f) {
                return globals;
            }
        });
        globals.set("unpack", new unpack());


        // math.log10 got removed in 5.2
        LuaValue math = globals.get("math");
        math.set("log10", new OneArgFunction() {
            @Override
            public LuaValue call(LuaValue luaValue) {
                return valueOf(Math.log10(luaValue.checkdouble()));
            }
        });


        // table.maxn got removed in 5.2
        LuaValue table = globals.get("table");
        table.set("maxn", new OneArgFunction() {
            @Override public LuaValue call(LuaValue arg) {
                // TODO: is this correct?
                return arg.checktable().len();
            }
        });

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            }
        };
    }


    private LuaValue unstrip() {
        return new OneArgFunction() {
            @Override
            public LuaValue call(LuaValue arg) {
                return NIL;
            }
        };

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