Examples of org.luaj.vm2.lib.LibFunction

org.luaj.vm2.LuaTable
Subclass of {@link LuaFunction} common to Java functions exposed to lua.
To provide for common implementations in JME and JSE, library functions are typically grouped on one or more library classes and an opcode per library function is defined and used to key the switch to the correct function within the library.
Since lua functions can be called with too few or too many arguments, and there are overloaded {@link LuaValue#call()} functions with varying number of arguments, a Java function exposed in lua needs to handle the argument fixup when a function is called with a number of arguments differs from that expected.
To simplify the creation of library functions, there are 5 direct subclasses to handle common cases based on number of argument values and number of return return values.
- {@link ZeroArgFunction}
- {@link OneArgFunction}
- {@link TwoArgFunction}
- {@link ThreeArgFunction}
- {@link VarArgFunction}
To be a Java library that can be loaded via {@code require}, it should have a public constructor that returns a {@link LuaValue} that, when executed, initializes the library.
For example, the following code will implement a library called "hyperbolic" with two functions, "sinh", and "cosh":
```
  {@code import org.luaj.vm2.LuaValue;}public class hyperbolic extends org.luaj.vm2.lib.OneArgFunction  public hyperbolic() {} public LuaValue call(LuaValue arg) { switch ( opcode ) { case 0: { LuaValue t = tableOf(); this.bind(t, hyperbolic.class, new String[] { "sinh", "cosh" }, 1 ); env.set("hyperbolic", t); return t; } case 1: return valueOf(Math.sinh(arg.todouble())); case 2: return valueOf(Math.cosh(arg.todouble())); default: return error("bad opcode: "+opcode); } } }  }
```
The default constructor is both to instantiate the library in response to {@code require 'hyperbolic'} statement, provided it is on Javas class path, and to instantiate copies of the {@code hyperbolic} class when initializing library instances. . The instance returned by the default constructor will be invoked as part of library loading. In response, it creates two more instances, one for each library function, in the body of the {@code switch} statement {@code case 0} via the {@link #bind(LuaValue,Class,String[],int)} utility method.It also registers the table in the globals via the {@link #env} local variable, which should be the global environment unless it has been changed. {@code case 1} and {@code case 2} will be called when {@code hyperbolic.sinh}{@code hyperbolic.sinh} and {@code hyperbolic.cosh} are invoked.
To test it, a script such as this can be used:
```
  {@code local t = require('hyperbolic') print( 't', t ) print( 'hyperbolic', hyperbolic ) for k,v in pairs(t) do print( 'k,v', k,v ) end print( 'sinh(.5)', hyperbolic.sinh(.5) ) print( 'cosh(.5)', hyperbolic.cosh(.5) )}
```
It should produce something like:
```
  {@code t	table: 3dbbd23f hyperbolic	table: 3dbbd23f k,v	cosh	cosh k,v	sinh	sinh sinh(.5)	0.5210953 cosh(.5)	1.127626}
```
See the source code in any of the library functions such as {@link BaseLib} or {@link TableLib} for specific examples.


import java.io.IOException;


public class ModuleExecutor {
    public String run(IWikiModel model, String module, String method, Frame frame) throws IOException {
        final Globals globals = getGlobals();
        MwCommon common = new MwCommon(model, globals);
        return common.execute(module, method, frame);
    }

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        MwCommon common = new MwCommon(model, globals);
        return common.execute(module, method, frame);
    }


    private Globals getGlobals() {
        final Globals globals = JsePlatform.standardGlobals();
//        LuaJC.install(globals);
        return globals;
    }

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    if (packageLib.loaded.get(packageName).toboolean()) {
      return;
    }
    
    Prototype prototype = LuaCache.loadPackage(packageName, system);
    LuaClosure function = new LuaClosure(prototype, globals);
    function.invoke();
    
    packageLib.loaded.set(packageName, globals);
  }

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                    defaultAnimationName = animationName; // set first animation as the default one
                }
            }
            catch (SpriteException ex) {
                // Error in the input file.
                throw new LuaError(ex);
            }
            catch (Exception ex) {
                // Error in the editor.
                ex.printStackTrace();
                throw new LuaError(ex);
            }


            return LuaValue.NIL;
        }

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            LuaC.install();
            LuaTable environment = LuaValue.tableOf();


            environment.set("animation", new AnimationFunction());


            LuaFunction code = LoadState.load(new FileInputStream(spriteFile),
                spriteFile.getName(), environment);
            code.call();
        }
        catch (IOException ex) {
            throw new SpriteException(ex.getMessage());
        }
        catch (LuaError ex) {

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                    if (!param.get("raw").isnil()) {
                        actualParam = param.get("raw").checkjstring();
                    } else if (!param.get("num").isnil()) {
                        if (param.get("num").isnumber()) {
                            LuaNumber number = param.get("num").checknumber();
                            NumberFormat nf = NumberFormat.getInstance(Locale.forLanguageTag(lang));
                            actualParam = nf.format(number.todouble());
                        } else {
                            actualParam = param.get("num").tojstring();
                        }
                    } else {
                        actualParam = "unknown";

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        try {
            this.animations = new TreeMap<String, SpriteAnimation>();
            File spriteFile = Project.getSpriteFile(animationSetId);
            LuaC.install();
            LuaTable environment = LuaValue.tableOf();


            environment.set("animation", new AnimationFunction());


            LuaFunction code = LoadState.load(new FileInputStream(spriteFile),
                spriteFile.getName(), environment);
            code.call();
        }

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        @Override
        public LuaValue call(LuaValue arg) {


            try {
                LuaTable table = arg.checktable();


                String animationName = table.get("name").checkjstring();
                String srcImageName = table.get("src_image").checkjstring();
                int frameDelay = table.get("frame_delay").optint(0);
                int frameToLoopOn = table.get("frame_to_loop_on").optint(-1);
                LuaTable directionsTable = table.get("directions").checktable();


                BufferedImage srcImage = null;


                try {
                    if (!srcImageName.equals("tileset")) {
                        srcImage = Project.getProjectImage("sprites/" + srcImageName);
                    }
                    else if (!tilesetId.isEmpty()) {
                        srcImage = Project.getProjectImage(
                                "tilesets/" + Project.getTilesetEntitiesImageFile(tilesetId).getName());
                    }
                } catch (IOException ex) {
                    // image cannot be loaded
                }


                Vector<SpriteAnimationDirection> directions = new Vector<SpriteAnimationDirection>();


                // 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);

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    }


    private void fakeWikiBase() {
        // fake http://www.mediawiki.org/wiki/Extension:Wikibase
        final LuaValue mw = globals.get("mw");
        final LuaTable wikibase = new LuaTable();
        wikibase.set("getEntity", new ZeroArgFunction() {
            @Override public LuaValue call() {
                return NIL;
            }
        });
        mw.set("wikibase", wikibase);

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        }
    }


    @Override
    public LuaTable getInterface() {
        final LuaTable table = new LuaTable();
        table.set("loadPackage", loadPackage());
        table.set("frameExists", frameExists());
        table.set("newChildFrame", newChildFrame());
        table.set("getExpandedArgument", getExpandedArgument());
        table.set("getAllExpandedArguments", getAllExpandedArguments());
        table.set("getFrameTitle", getFrameTitle());
        table.set("expandTemplate", expandTemplate());
        table.set("callParserFunction", callParserFunction());
        table.set("preprocess", preprocess());
        table.set("incrementExpensiveFunctionCount", incrementExpensiveFunctionCount());
        table.set("isSubsting", isSubsting());
        return table;
    }

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